This standard specifies the test methods for LH series wire pulling equipment. JB/T 6756.2-1993 Test methods for wire and cable special equipment Part 2: LH series wire pulling equipment JB/T6756.2-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Testing methods for special equipment for wires and cables
Part 2: LH series wire drawing equipment
1 Subject content and scope of application
This standard specifies the testing methods for LH series wire drawing equipment. This standard applies to LH series wire drawing equipment. This standard is used together with JB/T6756.1 "Special equipment for wires and cables 2 Reference standards
GB10095 Accuracy of involute cylindrical gears
JB/T5816 Technical requirements for wire and cable drawing equipment JB/T6756.2-93
Testing methods Part 1: General". JB/DQ8657 Product quality classification of special equipment for wires and cables JB/DQ8124.1 Basic technical requirements for cable equipment 3 Idle running performance test
3.1 Preparation before testing
Before testing, the provisions of Chapter 3 of JB/T6756.1 should be followed. 3.2 Rotation steps and time of transmission mechanism
The operating mechanism of the main machine should start from the lowest speed and then increase step by step. Generally, it should operate at three speeds: low, medium and high. The operating time of each speed should not be less than 30 minutes, and the continuous idling time at the highest speed should not be less than 4 hours. 3.3 Main machine speed detection
Use a tachometer to measure the speed of each wire pulley shaft, and its speed should meet the design requirements. 3.4 Temperature rise detection
At the rated speed, use a point thermometer to measure the temperature of the bearing caps at the front and rear ends of the wire pulley shaft and the suspicious points and calculate the temperature rise. The temperature rise should meet the requirements of JB/DQ8124.
3.5 Noise detection
Noise detection should comply with the provisions of Article 5.1 of JB/T6756.1 and be carried out at the highest speed. 3.6 Electromechanical safety protection device detection
Electromechanical safety protection device detection should meet the provisions of Article 5.3 of JB/T6756.1. 4 Load operation performance test
After the equipment passes the idle operation test, it is adjusted and then tested under normal process conditions. 4.1 Product specification test
From the production specifications specified by the equipment, select large, medium and small specifications as the processing objects, and run them at the maximum speed allowed by the processing objects. Each specification must not be less than 1 full plate, and the outlet wire diameter is measured with conventional measuring tools. 4.2 Reliability test
Approved by the Ministry of Machinery Industry on August 21, 1993
Implementation on October 1, 1993
JB/T6756.2-93
Within the specified operating speed range of the equipment and under normal production conditions, it can run continuously for 24 hours without failure. 4.3 Line speed test
4.3.1 Theoretical line speed V
When the equipment is running, use a tachometer to measure the speed of the fixed-speed wheel. The theoretical line speed of the fixed-speed wheel is calculated as shown in formula (1). t(D+d)n
60×1000
Where: D——diameter of the speed wheel, mm;
d-diameter of the conductor, mm
n-speed of the speed wheel, r/min;
V.-theoretical linear speed. m/s.
4.3.2 Use the instrument to measure the actual linear speed V2 of the conductor. 4.4 Slip rate detection
Use the tachometer to measure and calculate the theoretical linear speed V, value of the speed wheel and the actual outlet speed V, value of the conductor. The slip rate calculation is shown in formula (2).
Where: V,—theoretical linear speed, m/min; V, actual linear speed, m/min.
5 Precision inspection of main parts
5.1 The inspection of radial runout value of the working surface of the wire drawing wheel and the fixed speed wheel
The inspection of the working surface roughness shall comply with the provisions of Figure 1 and Table 1; b.
The inspection of the working surface roughness shall comply with the provisions of Figure 2 and Table 2; c.
The inspection of the working surface hardness shall comply with the provisions of Table 3: The inspection of dynamic balancing accuracy shall comply with the provisions of Table 4. d.
5.2 Main gearbox
The inspection of the axial parallelism of each bearing hole of the gearbox body shall comply with the provisions of Figure 3 and Table 5; the gear accuracy inspection shall comply with the relevant provisions of GB10095 and GB11365. 6 Machine accuracy inspection
6.1 After the wire drawing wheel (shaft) and the fixed speed wheel (shaft) are assembled, the inspection of the radial runout accuracy of the working surface of the wire drawing wheel (shaft) and the fixed speed wheel (shaft) shall comply with the provisions of Figure 4 and Table 6. 6.2 Position detection of mold frame and wire drawing wheel
The center axis of the mold hole of the mold frame shall coincide with the tangent line between the two wire drawing wheels, and the detection method shall comply with the provisions of Figure 5 and Table 7. 6.3 Detection of wire taking-up and arranging device
(2)
After the cantilever type and end shaft type wire taking-up reel shaft parts are assembled, the accuracy detection of the radial runout or coaxiality of the wire taking-up shaft shall comply with the provisions of Figure 6, Figure 7 and Table 8.
Visually inspect the reliability, sensitivity and wire arrangement quality of the wire arrangement rod movement. 7 Appearance quality inspection
Appearance quality inspection shall comply with the provisions of Article 5.2 of JB/T6756.1. 164
Testing items
Surface rotation
Testing items
Working surface roughness
Testing items
Working surface hardness
JB/T5816
Table 1-1
JB/T5816
Table 1-3
JB/T5816
Table 1-3
JB/T6756.2-93
Testing tools
1. Deflection meter
2. Inspection spindle| |tt||Testing method
1. Insert the testing mandrel seamlessly into the hole of the wire drawing wheel, place it on the deflection meter, and make the indicator probe touch the surface to be tested as shown in A, B, C, and D. 3. Measurement with indicator
2. Gently rotate the testing mandrel, and the difference between the maximum and minimum values ​​shown by the indicator
Testing tool
Roughness comparison sample block;
5~10 times magnifying glass
Roughness tester
Testing tool
Rockwell hardness tester
The difference is the runout error of the test surface.
Testing method
Take the roughest part on the working surface of the wire drawing wheel and the fixed speed wheel as the test base surface. Place a set of roughness comparison samples at the same distance and angle from the surface A to be tested under sunlight (light), and use a magnifying glass to compare the roughness level under visual observation. When there is a dispute using the sample comparison method, use a roughness tester for testing, and the test conclusion of the tester shall prevail.
Testing method
Place the hardness tester vertically on the working surface of the wire drawing wheel or the fixed speed wheel or at a position close to the working surface, and test according to the relevant operating regulations of the hardness tester
Testing items
Dynamic balancing accuracy
Testing items
Parallelism of each bearing hole
Testing items
Shaft radial circle
Wheel working table
Surface radial circle
JB/DQ8657.2||tt| |JB/T5816
JB/T5816
JB/T5816
JB/T6756.2-93
Testing tools
1. Dynamic balancing test machine
Testing tools
1. Measurement of indicators
2. Fixed and adjustable
3 supports
Testing methods
1. After the wire pulley or fixed speed wheel is assembled, the mandrel is inserted into the hole without gaps and placed on the dynamic balancing machine.
2. Perform dynamic balancing accuracy inspection according to the operating regulations of the dynamic balancing test machine, Figure 3
Testing methods
1. Place the gearbox on three equal-height supports on the workbench of the clock bed. 2. Fix the measuring frame on the boring machine spindle, rotate the spindle, and calibrate any bearing hole on the gearbox so that the center lines of the front and rear holes coincide.
3. Move the workbench to align the second bearing hole with the spindle of the machine; measure in three axial sections that are 120° apart in sequence, and take the maximum value of half the difference in the indicator readings during the entire measurement process as the parallelism error of the bearing hole.
(NN,)ax
4. Detect the parallelism errors of the remaining bearing holes in sequence. 5. Random detection is also possible.
Detection tools||tt| ...
2. Each shaft should be measured at a and b, and the larger value is the radial runout error of the shaft. 1. Fix the measuring frame on the equipment according to Figure 4B, and the indicator probe touches the measured surface to make the measured wheel rotate indirectly. The difference between the maximum and minimum indications indicated by the indicator is the circular runout error of the test surface.
2.All working surfaces need to be inspected.
Inspection items
The degree of coincidence between the center of the mold hole of the mold frame
axis and the tangent of the two wire drawing wheels
JB/T5816
Article 5.2.1.a
Active itemsSharp axis
JB/T6756.2-93
Inspection tools
Wrap a 0.1mm copper wire around the working surface of the previous wire drawing wheel and pass through the mold hole of the mold frame, then wrap it around the working surface of the next wire drawing wheel and draw the table, and visually inspect the degree of coincidence between the center axis of the mold frame and the copper wire. Figure 6 Cantilevered hip type
Rotating top shaft
End shaft type
Test itemswwW.bzxz.Net
Cantilever take-up shaft diameter
Diameter run-out
Same as end shaft take-up shaft
Additional instructions:
JB/T5816
JB/T5816
JB/T6756.2-93
Testing tools
Measurement with indicator
1.Special measurement for extension
2.Indicator
1.As shown in Figure 6, fix the measuring frame on the equipment, and the indicator probe touches the surface of the take-up shaft to make the take-up shaft rotate indirectly. The difference between the maximum and minimum values ​​indicated by the indicator is the radial run-out error value of the test surface. Test at a, b, and c of the shaft, and take the maximum error value as the radial runout of the shaft. 2.
Dynamic error value.
1. According to Figure 7, extend the movable top to the working length position, and then fix the measuring rod on the rotating top shaft so that the indicator probe touches the surface of the movable top shaft. Indirectly rotate the rotating top shaft to make the indicator rotate around the movable top shaft. The maximum reading difference of the indicator is the coaxiality error of the measured section. 2. Test once at sections a and b of the movable top shaft. The larger value is the coaxiality error.
This standard was proposed and managed by the Shanghai Cable Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Oriental Electric Machinery Factory. The main drafters of this standard are Yang Zhen and Yang Binhua. 168
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