Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T 5334-1999
Electric Threading Machine
Published on August 6, 1999
National Bureau of Machinery Industry
Implemented on January 1, 2000
JB/T5334-1999
This standard is the first revision of JB5334-91 "Electric Threading Machine". This standard adds 4.8.2, 4.8.3, 5.5, 5.6, and modifies 2, 8.1 and Table 2. This standard is compiled based on GB/T1.1-1993 "Guidelines for Standardization Work Unit 1: Rules for Drafting and Expression of Standards Part 1: Basic Regulations for Standardization".
This standard replaces JB5334-91 from the date of implementation. This standard is proposed and managed by the National Electric Tool Standardization Committee. The drafting unit of this standard: Shanghai Electric Tool Research Institute. The main drafters of this standard: Wu Kaimin, Ma Wanxi, Li Wenying, Chen Guohuan. 1 Scope
Machinery Industry Standard of the People's Republic of China
Electric Pipe Threading
JB/T 5334 -1999
Replaces JB5334-1991
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of electric pipe threading machines. This standard is applicable to portable electric pipe threading machines (hereinafter referred to as pipe threading machines) driven by asynchronous motors and rotating workpieces under general environmental conditions, which can thread the tapered external threads specified in GB/T7306 and have the functions of cutting off and chamfering the inner holes. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB2099.1—1996
GB/T3091—1993
GB3883.1—1992
GB4343—1995
GB/T 4583-1995
GB/T5023.5—1997
GB/T 5171-1991
GB/T7306—1987
GB/T9088—1988
GB17625.1—1998
GB17625.2—1999
3 Product classification
3.1 Classification
Plugs and sockets for household and similar purposes Part 1: General requirements (eqvIEC60884:1994 ）Galvanized welded steel pipes for low pressure fluid delivery
Safety of electric tools Part 1: General requirements (idtIEC60745-1:1982)Measuring methods and allowable values of radio interference characteristics of household and similar electric and heating appliances, electric tools and similar electrical appliances (eqvC.ISPRNO.14:1993)Engineering method for measuring noise of electric tools
Rated voltage 450/750V and below Rubber Sheath insulated flexible cable (idtIEC60245:1994)
Part 4: Flexible cords and flexible cables
Polyvinyl chloride insulated cables of rated voltage 450/750V and below (idtIEC60227:1993)
General technical conditions for small power motors
Pipe threads sealed with threads
Model compilation method for electric tools
Part 5: Flexible wires (cords)
Limits of harmonic currents emitted by low-voltage electrical and electronic equipment (equipment input current per phase ≤16A) (idtIEC61000-32:1995)
Electromagnetic compatibility and flicker limits of voltage fluctuations generated by equipment with rated current not exceeding 16A in low-voltage power supply systems (idtIEC61000-3-3:1994) 3.1.1 According to the protection method against electric shock, it belongs to Class 1 tools. 3.1.2 According to the power supply conditions, it is divided into:
a) single-phase pipe threading machine;
b) three-phase pipe threading machine.
3.2 The basic parameters of the pipe threading machine shall comply with the provisions of Table 1. Approved by the State Bureau of Machinery Industry on August 6, 1999 and implemented on January 1, 2000
Specifications\
JB/T 5334 - 1999
Ranging external thread range
(Size code)
Basic parameters
Rated power of motor
≥750
≥750
1) Specification refers to the maximum nominal diameter of water and gas pipes that can be made in accordance with GB/T3091. 3.3
The model of the threading machine shall comply with the provisions of GB/T9088, with the following meanings: Z
Technical requirements
General requirements
Rated spindle speed
The maximum nominal diameter of the water and gas pipes that can be threaded, expressed in Arabic numerals in mm
Design serial number
Design unit code
Threading machine (product code)
Code for the power source category used by the threading machine
Construction and road category (major category code)
1 The threading machine shall be manufactured according to the drawings and technical documents approved through the prescribed procedures. 4.1.1
: The threading machine should be able to operate at rated speed under the following environmental conditions: 4. 1. 2
a) The altitude shall not exceed 1000m;
b) The ambient air temperature shall not exceed 40℃ and shall not be lower than -15℃; c) The relative humidity of the air shall not exceed 90% (25℃). 4.1.3
The applicable power supply conditions for the threading machine are:
a) The single-phase threading machine should be able to operate at rated speed under a single-phase AC power supply with a power supply voltage of an actual sine waveform and a rated frequency; b) The three-phase threading machine should be able to operate at rated speed under a three-phase AC power supply with a power supply voltage of an actual sine waveform and an actual symmetrical system and a rated frequency.
4.1.4 The rated voltage and frequency are:
a) AC rated voltage: single-phase 220V;
three-phase 380V (line voltage);
b) Rated frequency: 50Hz.
4.2 Safety requirements for threading machines
4.2.1 Plug
The performance of the threading machine plug shall comply with the provisions of GB2099.1. 4.2.2 Power cable
The flexible cable connecting the threading machine and the power supply shall be the YZW type flexible cable specified in GB5013.4, or a flexible cable with performance not lower than it.
Electric shock protection
4. 2. 3. 1
JB/T 5334 - 1999
The structure of the threading machine shall be sufficient to prevent accidental contact with live parts. : The threading machine must be designed so that in normal use, there will be no risk of electric shock due to charged capacitors. After disconnecting the power supply, the voltage between the plug pins shall not exceed 34V.
The threading machine must be able to start at all normal voltages that may occur during use. 4.2.5 Temperature rise
When the threading machine motor is running under rated load conditions, the temperature rise of its winding shall not exceed the allowable value specified in Table 2. 4.2.6 Leakage current
The leakage current value measured in accordance with regulations shall not be greater than 0.75mA. The leakage current of the threading machine motor shall not be too large in normal use. 4.2.7
Wet heat test
After the wet heat test, the threading machine motor shall comply with the provisions of 4.2.8.1 and 4.2.8.2, and there shall be no rust that affects normal operation. Temperature rise limit
E-class insulation winding
B-class insulation winding
F-class insulation winding
Normal use non-holding housing
Handles, buttons and similar parts held continuously in normal use: metal
Note: When the altitude of the test site or the place of use is different from the specified environmental conditions, the correction of the winding temperature rise limit shall be carried out in accordance with the provisions of GB/T755. 4.2.8
Insulation resistance and dielectric strength
The threading machine shall have sufficient insulation resistance and dielectric strength. K
4.2.8.1 After the threading machine motor has been subjected to the wet heat test, the insulation resistance of the winding to the housing and between the windings shall not be less than the calculated value of the following formula: R
Where: R--insulation resistance of the motor winding, Ma; -rated voltage of the motor winding, V.
After the damp heat test, the windings to the casing and to each other should be able to withstand a test voltage of 50Hz, with a waveform of an actual sinusoidal 4.2.8.2
wave and an effective value of 2 times the rated voltage plus 500V, for 1 minute, without breakdown. 4. 2. 8.3
After the endurance test, the insulation of the threading machine shall be able to withstand the test voltage with a frequency of 50Hz and a waveform of a real sine wave for 1min. The test voltage value and the location of application shall be in accordance with the provisions of Table 3. No breakdown phenomenon.
Table 3 Test voltage
Location of test voltage application
Between live parts and shell parts
Between live parts of different polarities
Between shell and metal box wrapped around power cable4. 2. 9
Stability and mechanical hazards
4. 2. 9. 1
4. 2. 9. 2
The threading machine shall have sufficient stability.
Test voltage
Rotating parts without protective covers such as chucks must be smooth and have no sharp edges, and will not cause harm to the human body. Construction
The threading machine must be constructed so that any wire, nut, washer, etc. will not cause accessible screws,
metal parts to become live when it becomes loose or falls out of place.
Power connection
4. 2. 11. 1
4. 2. 11. 2
4.2. 11.3
JB/T 5334 - 1999
The nominal cross-section of the power cable for the threading machine shall not be less than that specified in Table 4. Table 4
Power cable specifications
Rated current of the motor
Less than or equal to 6
More than 6 to 10
Nominal cross-section
Wires with mixed green/yellow color codes are not allowed to be connected to terminals other than grounding terminals. The power cable of the threading machine shall be securely fixed by means of a cable fixing device so that the flexible cable will not be subject to stress at the connection inside the threading machine as long as the phase conductors are still in contact with their terminals when the fixing device fails. The cable fixing shall be made of insulating material or be provided with insulating pads. 4.2.11.4
The flexible cable of the threading machine must be protected by a cable sheath made of insulating material or a suitable entry sheath to prevent excessive bending at the entry hole of the threading machine. The sheath must be fixed in a secure manner and the length protruding from the entry hole shall be at least 5 times the outer diameter of the flexible cable used in the threading machine.
4.2.11.5
The entry hole for the power cable of the threading machine shall be designed so that the protective layer of the flexible cable will not be damaged when it is introduced. Terminals for external wires
4. 2. 12. 1
4. 2. 12. 2
The threading machine must have screws, 9
nuts or equivalent devices as terminals for connecting the power cable. The cylindrical terminal should have the dimensions listed in Table 5: Table 5
Dimensions of cylindrical terminal
Rated current of motor
6 and below
More than 6 to 10
Minimum thread
Nominal diameter
Wire hole
Minimum diameter
Thread in column
Minimum length
The maximum difference between the diameter of the hole and the thread
Nominal diameter
The length of the threaded part of the terminal screw shall not be less than the sum of the diameter of the wire hole and the length of the thread in the column. The end of the wire clamping should be smooth and free of sharp pits or protrusions.
There shall be no accessible metal parts within 8mm around the terminal. 4.2.13
Grounding device
The accessible metal parts of the threading machine must be permanently and reliably electrically connected to the terminal of the threading machine. The grounding resistance shall not be greater than 0.1n.
Non-threadless terminals shall not be used for grounding connections. Grounding screws shall be securely locked and cannot be loosened without tools. 4.2.13.2
4.2.13.3
Unless the body of the grounding terminal is part of a metal frame or enclosure, it must be made of brass or other metal with the same corrosion resistance; in this case, the screw or nut must be made of brass, electroplated steel that meets the requirements of 4.2.15, or other metal with the same corrosion resistance.
If the body of the grounding terminal is part of an aluminum alloy frame or enclosure, measures must be taken to avoid the risk of corrosion caused by contact between copper and aluminum or aluminum alloy.
4.2.14 Creepage distances and electrical clearances
Creepiness distances and electrical clearances shall not be less than the values listed in Table 6. Table 6
Between live parts of different polarities
Between live parts and other metal parts
Between windings coated with varnish or enamel and other metal parts 4
Creep distance and clearance
Creep distance
Clearance
Steel screws,
Appearance quality of threading machines
JB/T 5334 -1999
Nuts and washers used for grounding terminals should be subjected to necessary surface treatment to prevent rust. The castings of threading machines should not have defects such as pores, shrinkage cavities, slag inclusions and cracks, and other parts should not have defects that affect appearance and use. The coating of threading machines should not have delamination and residue. 4.3. 2
Machining and assembly quality of threading machine
The tolerance value of radial circle runout of the three-jaw rotating center of the chuck and the coaxiality tolerance value of the center line of the die and the center line of the spindle shall comply with the provisions of Table 7.
100~150
Position tolerance of the three-jaw chuck
Moving tolerance
The axial motion of the spindle shall be 0.05~0.25mm. The sliding of the carriage shall be flexible, and the sliding force shall comply with the provisions of Table 8.
Sliding force
The cutting oil shall be supplied normally, and the oil circuit shall not be blocked or leaked.
There shall be no crawling when cutting pipes.
Coaxiality norm
≤150
≤170
The taper external thread shall be complete and shall not have defects such as broken and irregular teeth exceeding 10% of its total length. 4.4.6
At the measuring surface with a distance of 1m from a minimum rectangular box surrounding the threading machine as the reference box, the average value of the no-load noise sound pressure level (A-weighted) of the threading machine shall not exceed the allowable value specified in Table 9. Table 9
100~150
Electromagnetic compatibility
Radio and television interference level
Allowable value of noise
a) The continuous interference voltage level of the phase or neutral line to the ground measured in the frequency range of 0.15~30MHz shall not exceed the allowable value specified in Table 10.
0.15~0.35
>0.35~5.00
>5.00~30.00
Continuous interference voltage
dB(μV)
Decreases linearly with the logarithm of frequency
JB/T5334-1999
b) The continuous interference power level value measured by the power line radiation and the absorption clamp within the frequency range of 30~300MHz shall not exceed the allowable value specified in Table 11.
30~300
4.6.2 Harmonic current
Continuous interference power
Interference power
dB(PW)
Increases linearly with frequency 45 to 55
a) The steady-state harmonic current of the threading machine shall not exceed the limit specified in Table 12. Table 12
Steady-state harmonic current limit
Channel number
Odd harmonic
Even spectrum
15≤≤39
8≤≤40
Maximum allowable spectrum current
0.225×15/n
0.345X8/n
b) For 2nd to 10th even harmonics and 3rd to 19th odd harmonics, the transient harmonic current value allowed not exceeding 15s within any 2.5min observation period is 1.5 times the steady-state harmonic current limit specified in Table 12. 4.6.3 Voltage fluctuation and flicker
When the threading machine is connected to the low-voltage power grid, the voltage fluctuation and flicker values caused shall comply with the following provisions: P value shall not be greater than 1.0;
Pl value shall not be greater than 0.65;
The steady-state relative voltage change d. shall not exceed 3%; the maximum relative voltage change dmax shall not exceed 4%; the voltage change characteristic value d(t) shall not exceed 3% in 300ms. If the voltage change is caused by a manual switch or the frequency of occurrence is less than once per hour, P. and P. shall not be assessed. The steady-state relative voltage change value d, the maximum relative voltage change dmx, and the voltage change characteristic value d(t) shall be multiplied by a coefficient of 1.33. 5
Test method
Appearance inspection
Inspect the appearance quality of the threading machine by viewing. The inspection results shall comply with the provisions of 4.3.
5.2 Electric shock protection inspection
Test each possible position by watching the game and using the standard contact finger shown in Figure 1. The test results should comply with the provisions of 4.2.3.1. 6
JB/T5334-1999
Insulation materials
114°2
Tolerance: Angle ± 5'
Linear size: less than 25mm is -. es exceeds 25mm is ± 0.2 Figure 1 Standard test contact finger
A--A BB
5.2.2 The threading machine is operated at rated voltage without load, and then its switch is placed in the "off" position and the power plug is unplugged. Measure the voltage between the pins of the plug 1s after the power is disconnected. The measurement results should comply with the provisions of 4.2.3.2. Capacitors with a rated capacity not exceeding 0.1μF do not need to be subjected to the above test. 5.3 Processing and assembly quality inspection
5.3.1 Measurement of radial circular runout of the chuck three-way rotation center: a) Fix the test bar in the chuck. The test bar diameter shall comply with the provisions of Table 13. The test bar length shall be not less than 5mm after the chuck is extended, and not less than 100mm before the chuck is extended. bzxZ.net
50~100
Test bar diameter
Table 13 Test bar size
Limit deviation
Straightness tolerance
National runout tolerance
b) Fix the dial indicator on the cylindrical guide rail, select three positions at random within the range of about 100mm of the chuck before the test bar is extended, measure the reading difference of the dial indicator when the spindle rotates one circle, and take the maximum value. The measurement result shall comply with the provisions of 4.4.1.
5.3.2 Measurement of the coaxiality between the center line of the die head and the center line of the spindle Fix the dial indicator on the front chuck and measure the reading difference of the dial indicator when the spindle rotates one circle on the inner hole surface of the die head. The measurement result shall comply with the provisions of 4.4.1.
5.3.3 Measurement of the axial dynamic amount of the spindle
Fix the dial indicator on the cylindrical guide rail, push and pull the spindle by hand, and measure the reading difference of the dial indicator when pushing and pulling on the end surface of the front chuck. The measurement result shall comply with the provisions of 4.4.2.
5.3.4 Measurement of the sliding force of the slide
During the measurement, the die head, cutter holder and chamfering device shall be installed on the slide. At every possible position of the slide, a steady pulling force is applied to the slide through the dynamometer, and the reading of the dynamometer is read when the slide starts to slide. 7
The measurement result shall comply with the provisions of 4.3.3.
JB/T5334-1999
5.3.5 The threading machine shall thread, chamfer and cut off each specification of steel pipe in its processing range at rated voltage. No less than 3 thread heads shall be made for each specification.
The test results shall comply with the provisions of 4.4.4, 4.4.5 and 4.4.6. 5.4 Noise test
The noise test of the threading machine shall be carried out in accordance with the provisions of GB/T4583. During the measurement, the threading machine shall run at no load for at least 3 minutes at rated voltage.
The measurement results shall comply with the provisions of 4.5.
5.5 Measurement of radio and television interference level The measurement of radio and television interference level of the threading machine shall be carried out in accordance with the provisions of GB4343. During the measurement, the threading machine shall run continuously at no load. The test results shall comply with the provisions of 4.6.1.
5.6 Harmonic current measurement
The harmonic current measurement of the threading machine shall be carried out in accordance with the provisions of GB17625.1. During the measurement, the threading machine shall run continuously without load. The measurement results shall comply with the provisions of 4.6.2.
5.7 Voltage fluctuation and flicker measurement
The voltage fluctuation and flicker measurement of the threading machine shall be carried out in accordance with the provisions of GB17625.2. During the measurement, the threading machine shall run continuously without load. The measurement results shall comply with the provisions of 4.6.3.
5.8 Starting test
The threading machine shall be started continuously for 3 times at a voltage equal to 0.85 times the rated voltage. If there is a speed control handle, it shall be placed in the normal use position. The test results shall comply with the provisions of 4.2.4.
5.9 Temperature rise test
a) Install the threading machine motor on the dynamometer, apply load to the motor at rated voltage, make the measured output power reach the rated power of the motor indicated on the nameplate, and run the motor under this condition until all parts of the motor reach thermal stability; b) Measure the speed of the motor. Calculate the rated speed of the spindle according to the speed ratio of the threading machine; c) Measure the temperature of the motor winding by the resistance method; d) The temperature rise measurement and calculation method shall comply with the provisions of Chapter 4 of GB/T5171-1991. The calculation results shall comply with the provisions of 3.2 and 4.2.5. 5.10 Leakage current measurement
a) Immediately after the temperature rise test, maintain the temperature rise test conditions, but the power supply voltage is equal to 1.06 times the rated voltage. Measure the leakage current between any pole of the power supply and the accessible metal parts and the metal foil (the two are connected together) that is close to the surface of the insulating material and has an area of no more than 20cmX10cm.
b) Leakage current measurement method
The measurement circuit for single-phase motors is shown in Figure 2, and the measurement circuit for three-phase motors is shown in Figure 3. The total resistance of the measurement circuit is (1750±250)a, and the circuit time constant is (225±15)μs through the parallel capacitor. If the motor has one or more capacitors and is equipped with a single-pole switch, the measurement should be repeated in the "off" position of the switch. The accuracy of the measuring instrument is within 5% at all rated frequencies within the range of 205000Hz. The motor should be powered by an isolation transformer, otherwise it must be insulated from the ground. The measurement results should comply with the provisions of 4.2.6.
5.11 Damp heat test
JB/T 5334 -1999
The thermal test of the threading machine motor is carried out in accordance with the provisions of 7.2 of GB/T5171-1991. The test results should comply with the provisions of 4.2.7.
5.12 Insulation resistance measurement and dielectric strength test 6
Insulation resistance measurement and dielectric strength test shall be carried out immediately after damp heat test and durability test in accordance with 6.1.3 and 7.2 of GB/T5171-1991.
Measurement and test results shall comply with the provisions of 4.2.8. 5.13 Durability test
The threading machine shall be subjected to durability test in accordance with the provisions of GB3883.1. During the test, if the temperature rise is too high, forced cooling measures may be taken. It is allowed to add lubricating oil and grease as in normal use. 5.14 Stability and mechanical hazard inspection
5.14.1 When the threading machine is placed on a plane at 10° to the horizontal plane in any normal use position with the power off, it shall not overturn.
5.14.2 Carry out mechanical hazard inspection by observation and manual test. The inspection results shall comply with the provisions of 4.2.9.
5.15 Structural inspection
Inspection is conducted through observation and manual test.
The inspection result shall comply with the provisions of 4.2.10. 5.16 Power connection inspection
Inspection is conducted through observation, measurement and the following tests. a) Pull the power cable 100 times in the most unfavorable direction at a distance of 250mm from the cable sheath with a pulling force of 100N, 15 each time, and no violent force shall be used when pulling;
b) Then, a torque test is conducted with a torque of 0.35N·m for 1min. During the test, the cable and the cable fixing device shall not be damaged. After the test, the longitudinal displacement of the cable shall not be greater than 2mm. The inspection result shall comply with the provisions of 4.2.11. 5.17 Wiring terminal inspection of external wires
Inspection is conducted through observation and measurement.
The inspection result shall comply with the provisions of 4.2.12. 5.18 Inspection of grounding device
Inspection shall be carried out through observation, manual test and the following tests. a) A current supplied by an AC power supply with a no-load voltage not exceeding 12V shall be passed alternately between the grounding terminal and each accessible metal part. This current is equal to 1.5 times the rated current but not less than 25A;1 Measurement of radial runout of the chuck's three-pipe rotation center: a) Fix the test bar in the chuck. The test bar diameter shall comply with the provisions of Table 13. The test bar length shall be not less than 5mm after the chuck is extended, and not less than 100mm before the chuck is extended.
50~100
Test bar diameter
Table 13 Test bar dimensions
Limit deviation
Straightness tolerance
National runout tolerance
b) Fix the dial indicator on the cylindrical guide rail, select three positions at random within the range of about 100mm of the chuck before the test bar is extended, measure the reading difference of the dial indicator when the spindle rotates one circle, and take the maximum value. The measurement result shall comply with the provisions of 4.4.1.
5.3.2 Measurement of the coaxiality between the center line of the die head and the center line of the spindle Fix the dial indicator on the front chuck and measure the reading difference of the dial indicator when the spindle rotates one circle on the inner hole surface of the die head. The measurement result shall comply with the provisions of 4.4.1.
5.3.3 Measurement of the axial dynamic amount of the spindle
Fix the dial indicator on the cylindrical guide rail, push and pull the spindle by hand, and measure the reading difference of the dial indicator when pushing and pulling on the end surface of the front chuck. The measurement result shall comply with the provisions of 4.4.2.
5.3.4 Measurement of the sliding force of the slide
During the measurement, the die head, cutter holder and chamfering device shall be installed on the slide. At every possible position of the slide, a steady pulling force is applied to the slide through the dynamometer, and the reading of the dynamometer is read when the slide starts to slide. 7
The measurement result shall comply with the provisions of 4.3.3.
JB/T5334-1999
5.3.5 The threading machine shall thread, chamfer and cut off each specification of steel pipe in its processing range at rated voltage. No less than 3 thread heads shall be made for each specification.
The test results shall comply with the provisions of 4.4.4, 4.4.5 and 4.4.6. 5.4 Noise test
The noise test of the threading machine shall be carried out in accordance with the provisions of GB/T4583. During the measurement, the threading machine shall run at no load for at least 3 minutes at rated voltage.
The measurement results shall comply with the provisions of 4.5.
5.5 Measurement of radio and television interference level The measurement of radio and television interference level of the threading machine shall be carried out in accordance with the provisions of GB4343. During the measurement, the threading machine shall run continuously at no load. The test results shall comply with the provisions of 4.6.1.
5.6 Harmonic current measurement
The harmonic current measurement of the threading machine shall be carried out in accordance with the provisions of GB17625.1. During the measurement, the threading machine shall run continuously without load. The measurement results shall comply with the provisions of 4.6.2.
5.7 Voltage fluctuation and flicker measurement
The voltage fluctuation and flicker measurement of the threading machine shall be carried out in accordance with the provisions of GB17625.2. During the measurement, the threading machine shall run continuously without load. The measurement results shall comply with the provisions of 4.6.3.
5.8 Starting test
The threading machine shall be started continuously for 3 times at a voltage equal to 0.85 times the rated voltage. If there is a speed control handle, it shall be placed in the normal use position. The test results shall comply with the provisions of 4.2.4.
5.9 Temperature rise test
a) Install the threading machine motor on the dynamometer, apply a load to the motor at the rated voltage, make the measured output power reach the rated power of the motor indicated on the nameplate, and run the motor under this condition until all parts of the motor reach a thermally stable state; b) Measure the speed of the motor. Calculate the rated speed of the spindle according to the speed ratio of the threading machine; c) Measure the temperature of the motor winding by the resistance method; d) The temperature rise measurement and calculation method shall comply with the provisions of Chapter 4 of GB/T5171-1991. The calculation results shall comply with the provisions of 3.2 and 4.2.5. 5.10 Leakage current measurement
a) Immediately after the temperature rise test, maintain the temperature rise test conditions, but the power supply voltage is equal to 1.06 times the rated voltage. Measure the leakage current between any pole of the power supply and the accessible metal parts and the metal foil (the two are connected together) that is close to the surface of the insulating material and has an area of no more than 20cmX10cm.
b) Leakage current measurement method
The measurement circuit for single-phase motor is shown in Figure 2, and the measurement circuit for three-phase motor is shown in Figure 3. The total resistance of the measurement circuit is (1750±250)a, and the circuit time constant is (225±15)μs through the parallel capacitor. If the motor has one or more capacitors and is equipped with a single-pole switch, the measurement should be repeated in the "off" position of the switch. The accuracy of the measuring instrument is within 5% at all rated frequencies within the range of 205000Hz. The motor should be powered by an isolation transformer, otherwise it must be insulated from the ground. The measurement results should comply with the provisions of 4.2.6.
5.11 Damp heat test
JB/T 5334 -1999
The thermal test of the threading machine motor is carried out in accordance with the provisions of 7.2 of GB/T5171-1991. The test results should comply with the provisions of 4.2.7.
5.12 Insulation resistance measurement and dielectric strength test 6
Insulation resistance measurement and dielectric strength test shall be carried out immediately after damp heat test and durability test in accordance with 6.1.3 and 7.2 of GB/T5171-1991.
Measurement and test results shall comply with the provisions of 4.2.8. 5.13 Durability test
The threading machine shall be subjected to durability test in accordance with the provisions of GB3883.1. During the test, if the temperature rise is too high, forced cooling measures may be taken. It is allowed to add lubricating oil and grease as in normal use. 5.14 Stability and mechanical hazard inspection
5.14.1 When the threading machine is placed on a plane at 10° to the horizontal plane in any normal use position with the power off, it shall not overturn.
5.14.2 Carry out mechanical hazard inspection by observation and manual test. The inspection results shall comply with the provisions of 4.2.9.
5.15 Structural inspection
Inspection is conducted through observation and manual test.
The inspection result shall comply with the provisions of 4.2.10. 5.16 Power connection inspection
Inspection is conducted through observation, measurement and the following tests. a) Pull the power cable 100 times in the most unfavorable direction at a distance of 250mm from the cable sheath with a pulling force of 100N, 15 each time, and do not use violent force when pulling;
b) Then, a torque test is conducted with a torque of 0.35N·m for 1min. During the test, the cable and the cable fixing device shall not be damaged. After the test, the longitudinal displacement of the cable shall not be greater than 2mm. The inspection result shall comply with the provisions of 4.2.11. 5.17 Wiring terminal inspection of external wires
Inspection is conducted through observation and measurement.
The inspection result shall comply with the provisions of 4.2.12. 5.18 Inspection of grounding device
Inspection shall be carried out through observation, manual test and the following tests. a) A current supplied by an AC power supply with a no-load voltage not exceeding 12V shall be passed alternately between the grounding terminal and each accessible metal part. This current is equal to 1.5 times the rated current but not less than 25A;1 Measurement of radial runout of the chuck's three-pipe rotation center: a) Fix the test bar in the chuck. The test bar diameter shall comply with the provisions of Table 13. The test bar length shall be not less than 5mm after the chuck is extended, and not less than 100mm before the chuck is extended.
50~100
Test bar diameter
Table 13 Test bar dimensions
Limit deviation
Straightness tolerance
National runout tolerance
b) Fix the dial indicator on the cylindrical guide rail, select three positions at random within the range of about 100mm of the chuck before the test bar is extended, measure the reading difference of the dial indicator when the spindle rotates one circle, and take the maximum value. The measurement result shall comply with the provisions of 4.4.1.
5.3.2 Measurement of the coaxiality between the center line of the die head and the center line of the spindle Fix the dial indicator on the front chuck and measure the reading difference of the dial indicator when the spindle rotates one circle on the inner hole surface of the die head. The measurement result shall comply with the provisions of 4.4.1.
5.3.3 Measurement of the axial dynamic amount of the spindle
Fix the dial indicator on the cylindrical guide rail, push and pull the spindle by hand, and measure the reading difference of the dial indicator when pushing and pulling on the end surface of the front chuck. The measurement result shall comply with the provisions of 4.4.2.
5.3.4 Measurement of the sliding force of the slide
During the measurement, the die head, cutter holder and chamfering device shall be installed on the slide. At every possible position of the slide, a steady pulling force is applied to the slide through the dynamometer, and the reading of the dynamometer is read when the slide starts to slide. 7
The measurement result shall comply with the provisions of 4.3.3.
JB/T5334-1999
5.3.5 The threading machine shall thread, chamfer and cut off each specification of steel pipe in its processing range at rated voltage. No less than 3 thread heads shall be made for each specification.
The test results shall comply with the provisions of 4.4.4, 4.4.5 and 4.4.6. 5.4 Noise test
The noise test of the threading machine shall be carried out in accordance with the provisions of GB/T4583. During the measurement, the threading machine shall run at no load for at least 3 minutes at rated voltage.
The measurement results shall comply with the provisions of 4.5.
5.5 Measurement of radio and television interference level The measurement of radio and television interference level of the threading machine shall be carried out in accordance with the provisions of GB4343. During the measurement, the threading machine shall run continuously at no load. The test results shall comply with the provisions of 4.6.1.
5.6 Harmonic current measurement
The harmonic current measurement of the threading machine shall be carried out in accordance with the provisions of GB17625.1. During the measurement, the threading machine shall run continuously without load. The measurement results shall comply with the provisions of 4.6.2.
5.7 Voltage fluctuation and flicker measurement
The voltage fluctuation and flicker measurement of the threading machine shall be carried out in accordance with the provisions of GB17625.2. During the measurement, the threading machine shall run continuously without load. The measurement results shall comply with the provisions of 4.6.3.
5.8 Starting test
The threading machine shall be started continuously for 3 times at a voltage equal to 0.85 times the rated voltage. If there is a speed control handle, it shall be placed in the normal use position. The test results shall comply with the provisions of 4.2.4.
5.9 Temperature rise test
a) Install the threading machine motor on the dynamometer, apply a load to the motor at the rated voltage, make the measured output power reach the rated power of the motor indicated on the nameplate, and run the motor under this condition until all parts of the motor reach a thermally stable state; b) Measure the speed of the motor. Calculate the rated speed of the spindle according to the speed ratio of the threading machine; c) Measure the temperature of the motor winding by the resistance method; d) The temperature rise measurement and calculation method shall comply with the provisions of Chapter 4 of GB/T5171-1991. The calculation results shall comply with the provisions of 3.2 and 4.2.5. 5.10 Leakage current measurement
a) Immediately after the temperature rise test, maintain the temperature rise test conditions, but the power supply voltage is equal to 1.06 times the rated voltage. Measure the leakage current between any pole of the power supply and the accessible metal parts and the metal foil (the two are connected together) that is close to the surface of the insulating material and has an area of no more than 20cmX10cm.
b) Leakage current measurement method
The measurement circuit for single-phase motor is shown in Figure 2, and the measurement circuit for three-phase motor is shown in Figure 3. The total resistance of the measurement circuit is (1750±250)a, and the circuit time constant is (225±15)μs through the parallel capacitor. If the motor has one or more capacitors and is equipped with a single-pole switch, the measurement should be repeated in the "off" position of the switch. The accuracy of the measuring instrument is within 5% at all rated frequencies within the range of 205000Hz. The motor should be powered by an isolation transformer, otherwise it must be insulated from the ground. The measurement results should comply with the provisions of 4.2.6.
5.11 Damp heat test
JB/T 5334 -1999
The thermal test of the threading machine motor is carried out in accordance with the provisions of 7.2 of GB/T5171-1991. The test results should comply with the provisions of 4.2.7.
5.12 Insulation resistance measurement and dielectric strength test 6
Insulation resistance measurement and dielectric strength test shall be carried out immediately after damp heat test and durability test in accordance with 6.1.3 and 7.2 of GB/T5171-1991.
Measurement and test results shall comply with the provisions of 4.2.8. 5.13 Durability test
The threading machine shall be subjected to durability test in accordance with the provisions of GB3883.1. During the test, if the temperature rise is too high, forced cooling measures may be taken. It is allowed to add lubricating oil and grease as in normal use. 5.14 Stability and mechanical hazard inspection
5.14.1 When the threading machine is placed on a plane at 10° to the horizontal plane in any normal use position with the power off, it shall not overturn.
5.14.2 Carry out mechanical hazard inspection by observation and manual test. The inspection results shall comply with the provisions of 4.2.9.
5.15 Structural inspection
Inspection is conducted through observation and manual test.
The inspection result shall comply with the provisions of 4.2.10. 5.16 Power connection inspection
Inspection is conducted through observation, measurement and the following tests. a) Pull the power cable 100 times in the most unfavorable direction at a distance of 250mm from the cable sheath with a pulling force of 100N, 15 each time, and do not use violent force when pulling;
b) Then, a torque test is conducted with a torque of 0.35N·m for 1min. During the test, the cable and the cable fixing device shall not be damaged. After the test, the longitudinal displacement of the cable shall not be greater than 2mm. The inspection result shall comply with the provisions of 4.2.11. 5.17 Wiring terminal inspection of external wires
Inspection is conducted through observation and measurement.
The inspection result shall comply with the provisions of 4.2.12. 5.18 Inspection of grounding device
Inspection shall be carried out through observation, manual test and the following tests. a) A current supplied by an AC power supply with a no-load voltage not exceeding 12V shall be passed alternately between the grounding terminal and each accessible metal part. This current is equal to 1.5 times the rated current but not less than 25A;5 Measurement of radio and television interference levels The measurement of radio and television interference levels of the threading machine shall be carried out in accordance with the provisions of GB4343. During the measurement, the threading machine shall run continuously without load. The test results shall comply with the provisions of 4.6.1.
5.6 Harmonic current measurement
The harmonic current measurement of the threading machine shall be carried out in accordance with the provisions of GB17625.1. During the measurement, the threading machine shall run continuously without load. The measurement results shall comply with the provisions of 4.6.2.
5.7 Voltage fluctuation and flicker measurement
The voltage fluctuation and flicker measurement of the threading machine shall be carried out in accordance with the provisions of GB17625.2. During the measurement, the threading machine shall run continuously without load. The measurement results shall comply with the provisions of 4.6.3.
5.8 Starting test
The threading machine shall be started continuously for 3 times at a voltage equal to 0.85 times the rated voltage. If there is a speed control handle, it shall be placed in the normal use position. The test results shall comply with the provisions of 4.2.4.
5.9 Temperature rise test
a) Install the threading machine motor on the dynamometer, apply load to the motor at rated voltage, make the measured output power reach the rated power of the motor indicated on the nameplate, and run the motor under this condition until all parts of the motor reach thermal stability; b) Measure the speed of the motor. Calculate the rated speed of the spindle according to the speed ratio of the threading machine; c) Measure the temperature of the motor winding by the resistance method; d) The temperature rise measurement and calculation method shall comply with the provisions of Chapter 4 of GB/T5171-1991. The calculation results shall comply with the provisions of 3.2 and 4.2.5. 5.10 Leakage current measurement
a) Immediately after the temperature rise test, maintain the temperature rise test conditions, but the power supply voltage is equal to 1.06 times the rated voltage. Measure the leakage current between any pole of the power supply and the accessible metal parts and the metal foil (the two are connected together) that is close to the surface of the insulating material and has an area of no more than 20cmX10cm.
b) Leakage current measurement method
The measurement circuit for single-phase motors is shown in Figure 2, and the measurement circuit for three-phase motors is shown in Figure 3. The total resistance of the measurement circuit is (1750±250)a, and the circuit time constant is (225±15)μs through the parallel capacitor. If the motor has one or more capacitors and is equipped with a single-pole switch, the measurement should be repeated in the "off" position of the switch. The accuracy of the measuring instrument is within 5% at all rated frequencies within the range of 205000Hz. The motor should be powered by an isolation transformer, otherwise it must be insulated from the ground. The measurement results should comply with the provisions of 4.2.6.
5.11 Damp heat test
JB/T 5334 -1999
The thermal test of the threading machine motor is carried out in accordance with the provisions of 7.2 of GB/T5171-1991. The test results should comply with the provisions of 4.2.7.
5.12 Insulation resistance measurement and dielectric strength test 6
Insulation resistance measurement and dielectric strength test shall be carried out immediately after damp heat test and durability test in accordance with 6.1.3 and 7.2 of GB/T5171-1991.
Measurement and test results shall comply with the provisions of 4.2.8. 5.13 Durability test
The threading machine shall be subjected to durability test in accordance with the provisions of GB3883.1. During the test, if the temperature rise is too high, forced cooling measures may be taken. It is allowed to add lubricating oil and grease as in normal use. 5.14 Stability and mechanical hazard inspection
5.14.1 When the threading machine is placed on a plane at 10° to the horizontal plane in any normal use position with the power off, it shall not overturn.
5.14.2 Carry out mechanical hazard inspection by observation and manual test. The inspection results shall comply with the provisions of 4.2.9.
5.15 Structural inspection
Inspection is conducted through observation and manual test.
The inspection result shall comply with the provisions of 4.2.10. 5.16 Power connection inspection
Inspection is conducted through observation, measurement and the following tests. a) Pull the power cable 100 times in the most unfavorable direction at a distance of 250mm from the cable sheath with a pulling force of 100N, 15 each time, and no violent force shall be used when pulling;
b) Then, a torque test is conducted with a torque of 0.35N·m for 1min. During the test, the cable and the cable fixing device shall not be damaged. After the test, the longitudinal displacement of the cable shall not be greater than 2mm. The inspection result shall comply with the provisions of 4.2.11. 5.17 Terminal inspection of external wires
Inspection is conducted through observation and measurement.
The inspection result shall comply with the provisions of 4.2.12. 5.18 Inspection of grounding device
Inspection shall be carried out through observation, manual test and the following tests. a) A current supplied by an AC power supply with a no-load voltage not exceeding 12V shall be passed alternately between the grounding terminal and each accessible metal part. This current is equal to 1.5 times the rated current but not less than 25A;5 Measurement of radio and television interference levels The measurement of radio and television interference levels of the threading machine shall be carried out in accordance with the provisions of GB4343. During the measurement, the threading machine shall run continuously without load. The test results shall comply with the provisions of 4.6.1.
5.6 Harmonic current measurement
The harmonic current measurement of the threading machine shall be carried out in accordance with the provisions of GB17625.1. During the measurement, the threading machine shall run continuously without load. The measurement results shall comply with the provisions of 4.6.2.
5.7 Voltage fluctuation and flicker measurement
The voltage fluctuation and flicker measurement of the threading machine shall be carried out in accordance with the provisions of GB17625.2. During the measurement, the threading machine shall run continuously without load. The measurement results shall comply with the provisions of 4.6.3.
5.8 Starting test
The threading machine shall be started continuously for 3 times at a voltage equal to 0.85 times the rated voltage. If there is a speed control handle, it shall be placed in the normal use position. The test results shall comply with the provisions of 4.2.4.
5.9 Temperature rise test
a) Install the threading machine motor on the dynamometer, apply load to the motor at rated voltage, make the measured output power reach the rated power of the motor indicated on the nameplate, and run the motor under this condition until all parts of the motor reach thermal stability; b) Measure the speed of the motor. Calculate the rated speed of the spindle according to the speed ratio of the threading machine; c) Measure the temperature of the motor winding by the resistance method; d) The temperature rise measurement and calculation method shall comply with the provisions of Chapter 4 of GB/T5171-1991. The calculation results shall comply with the provisions of 3.2 and 4.2.5. 5.10 Leakage current measurement
a) Immediately after the temperature rise test, maintain the temperature rise test conditions, but the power supply voltage is equal to 1.06 times the rated voltage. Measure the leakage current between any pole of the power supply and the accessible metal parts and the metal foil (the two are connected together) that is close to the surface of the insulating material and has an area of no more than 20cmX10cm.
b) Leakage current measurement method
The measurement circuit for single-phase motors is shown in Figure 2, and the measurement circuit for three-phase motors is shown in Figure 3. The total resistance of the measurement circuit is (1750±250)a, and the circuit time constant is (225±15)μs through the parallel capacitor. If the motor has one or more capacitors and is equipped with a single-pole switch, the measurement should be repeated in the "off" position of the switch. The accuracy of the measuring instrument is within 5% at all rated frequencies within the range of 205000Hz. The motor should be powered by an isolation transformer, otherwise it must be insulated from the ground. The measurement results should comply with the provisions of 4.2.6.
5.11 Damp heat test
JB/T 5334 -1999
The thermal test of the threading machine motor is carried out in accordance with the provisions of 7.2 of GB/T5171-1991. The test results should comply with the provisions of 4.2.7.
5.12 Insulation resistance measurement and dielectric strength test 6
Insulation resistance measurement and dielectric strength test shall be carried out immediately after damp heat test and durability test in accordance with 6.1.3 and 7.2 of GB/T5171-1991.
Measurement and test results shall comply with the provisions of 4.2.8. 5.13 Durability test
The threading machine shall be subjected to durability test in accordance with the provisions of GB3883.1. During the test, if the temperature rise is too high, forced cooling measures may be taken. It is allowed to add lubricating oil and grease as in normal use. 5.14 Stability and mechanical hazard inspection
5.14.1 When the threading machine is placed on a plane at 10° to the horizontal plane in any normal use position with the power off, it shall not overturn.
5.14.2 Carry out mechanical hazard inspection by observation and manual test. The inspection results shall comply with the provisions of 4.2.9.
5.15 Structural inspection
Inspection is conducted through observation and manual test.
The inspection result shall comply with the provisions of 4.2.10. 5.16 Power connection inspection
Inspection is conducted through observation, measurement and the following tests. a) Pull the power cable 100 times in the most unfavorable direction at a distance of 250mm from the cable sheath with a pulling force of 100N, 15 each time, and no violent force shall be used when pulling;
b) Then, a torque test is conducted with a torque of 0.35N·m for 1min. During the test, the cable and the cable fixing device shall not be damaged. After the test, the longitudinal displacement of the cable shall not be greater than 2mm. The inspection result shall comply with the provisions of 4.2.11. 5.17 Terminal inspection of external wires
Inspection is conducted through observation and measurement.
The inspection result shall comply with the provisions of 4.2.12. 5.18 Inspection of grounding device
Inspection shall be carried out through observation, manual test and the following tests. a) A current supplied by an AC power supply with a no-load voltage not exceeding 12V shall be passed alternately between the grounding terminal and each accessible metal part. This current is equal to 1.5 times the rated current but not less than 25A;The torque test is carried out at a torque of 35N·m for 1 min. During the test, the cable and the cable fixing device shall not be damaged. After the test, the longitudinal displacement of the cable shall not be greater than 2mm. The inspection results shall comply with the provisions of 4.2.11. 5.17 Inspection of the terminal blocks for external wires
Inspect through observation and measurement.
The inspection results shall comply with the provisions of 4.2.12. 5.18 Inspection of the grounding device
Inspect through observation, manual test and the following tests. a) Between the grounding terminal and each accessible metal part, a current supplied by an AC power supply with a no-load voltage not exceeding 12V is passed alternately. This current is equal to 1.5 times the rated current but not less than 25A; 9The torque test is carried out at a torque of 35N·m for 1 min. During the test, the cable and the cable fixing device shall not be damaged. After the test, the longitudinal displacement of the cable shall not be greater than 2mm. The inspection results shall comply with the provisions of 4.2.11. 5.17 Inspection of the terminal blocks for external wires
Inspect through observation and measurement.
The inspection results shall comply with the provisions of 4.2.12. 5.18 Inspection of the grounding device
Inspect through observation, manual test and the following tests. a) Between the grounding terminal and each accessible metal part, a current supplied by an AC power supply with a no-load voltage not exceeding 12V is passed alternately. This current is equal to 1.5 times the rated current but not less than 25A; 9
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