Some standard content:
Machinery Industry Standards of the People's Republic of China
CNC Horizontal Lathes
Subject Content and Scope of Application
Technical Conditions
This standard specifies the requirements for the manufacturing and acceptance of CNC horizontal lathes , JB/T 4368.3--96
replaces JBn4368-86
This standard is applicable to general-purpose ordinary precision CNC horizontal lathes with a maximum turning diameter of 200 to 1 000 mm on the bed. Reference standards
2
GB5226
GB 9061
GB 11357
General technical conditions for machine tool electrical equipment
General technical conditions for metal cutting machine tools
Material, surface roughness and balance of pulleys GB/T16462 Accuracy inspection of CNC horizontal lathes JB4139 Technical conditions for safety protection of metal cutting machine tools and machine tool accessories 3 Determination of cleanliness of metal cutting machine tools
ZB J50 003
ZB J50 004
Metal cutting machine tools
Determination of noise sound pressure level
General technical conditions for machined parts of metal cutting machine tools ZBn J50 008. 1||tt ||ZBnJ50008.3 General technical conditions for metal cutting machine tool assembly ZBJ50016 General technical conditions for metal cutting machine tool hydraulic systems 3 General requirements
This standard is the concretization and supplement of GB9061, ZBnJ50008.1, ZBnJ50008.3, etc. When accepting machine tools according to this standard, the remaining acceptance items in the above standards that are not specified in this standard must be inspected at the same time. 4 Accessories and tools
4.1
The accessories and accessories listed in Table 1 should be supplied randomly. tool. Table 1
name
card
weighing
disk
spring chuck
top
special auxiliary equipment|| tt||Iron
Pad
Special assembly and disassembly adjustment tool
Use
way
Clamping parts
Clamping parts|| tt||Support parts
Clamping tools
For installation of machine tools
For assembly and disassembly adjustment
Note: ①The chuck and spring chuck in Table 1, press Models and specifications required by users are supplied. ② Machine tools with no taper hole in the spindle and no tailstock do not provide centers. Quantity
1 piece
1 set
1 set
Type and quantity are specified by the manufacturer
1 set
1 set|| tt||4.2 Special accessories such as automatic tool setting devices to expand the performance of machine tools, automatic tool setting devices, etc., are supplied according to user requirements and agreements. Approved by the Ministry of Machinery Industry of the People's Republic of China on 1996-04-11 and implemented on 1996-10-01
35
5 Safety and Health
JB/T 4368.3—96
5.1 Cover Safety guards in the machining area must protect operators and people close to the machine tool from flying chips and contamination by coolant.
5.2 The mobile protective device should be interlocked with the machine tool working cycle. 5.3 The emergency stop button shall not automatically resume its function after completing the emergency stop action. 5.4 After the spindle is started, the foot switch should be interlocked with the workpiece clamping action. 5.5 Hydraulic, pneumatic and electric clamping devices for fastening workpieces should be able to reliably clamp the workpiece when the power supply, oil supply, air supply and pressure drop of the hydraulic and pneumatic clamping devices suddenly stop during processing. 5.6 The overload clutch of the feed transmission must be safely disengaged at the set overload torque, and the action must be flexible and reliable. 5.7 Detect the noise of machine tools according to the provisions of ZBJ50004. There should be no abnormal squeaking or impact sounds when the machine tool is running. When idling at any speed level, the noise sound pressure level of the entire machine shall not exceed 83dB(A). 5.8 When accepting machine tools according to this standard, the remaining acceptance items in JB4139, ZBJ50016.GB5226, etc. that are not specified in this standard must be inspected at the same time.
6 Processing and assembly quality
6.1 The bed, bed saddle, spindle box, etc. are important castings and must be aged after rough machining. 6.2 The bed and saddle guide rail pair, bed saddle and sliding plate The guide rail pair is an important guide rail pair and should adopt wear-resistant measures such as wear-resistant cast iron, steel-inlaid guide rails, injection molded guide rails, plastic-coated guide rails or induction quenching.
6.3 The following joint surfaces should be assessed according to the requirements of "important fixed joint surfaces": the joint surface of the bed and the base;
a.
The bed and the bed (spliced ??bed) joint surface. b.
6.4 The following joint surfaces should be assessed according to the requirements of "especially important fixed joint surfaces": The joint surface of the spindle box and the bed:
a.
b.||tt ||C
The joint surface between the steel guide rail and the base, the tailstock guide rail and the base; the joint surface between the rotary tool holder body and the sliding plate;
The rotary tool holder and the end toothed disc, the end toothed disc and the rotary The joint surface of the tool rest body; d.
The joint surface of the ball screw support seat and the bed, the ball screw nut seat and the bed saddle; e.
The joint surface of the tailstock body and the tailstock bottom plate Joint surface.
f.
6.5 The following guide rail pairs should be assessed according to the requirements of "sliding (rolling) guide rails": a. Lathe bed and saddle guide rail pair;
b.. Bed saddle and slide rail pair.
6.6 The tailstock and bed guide rail pair should be assessed according to the requirements of "displacement guide rail". 6.7 The spindle assembly should undergo dynamic balance testing and correction. The balance quality grade is G2.5, and the allowable remaining unbalance is determined according to formula (1). The balance of the pulley should comply with the provisions of Chapter 4 of GB11357. U 75×10°m
In the formula, U---the allowable remaining unbalance, gmm; m--the mass of the spindle assembly, kg;
n---the rotation speed of the spindle assembly during dynamic balancing ( Refers to the maximum speed of the machine tool spindle), r/min1
6.8 Check the cleanliness of the machine tool according to the regulations of ZBJ50003. The internal cleanliness of the spindle box and other components is inspected by the gravimetric method, and the impurities and dirt must not exceed the requirements in Table 2.
36
Maximum bar diameter dmm
Maximum turning diameter D.
mn
Spindle box
Rotary tool holder
Kun
Base
Hydraulic oil tank
25||tt| |JB/T 4368.3—96
Table 2
25~63
200~250
8000
3000
700|| tt||2000
>250~500
11000
4000
1000
3000
>500-800||tt| |16000
6000
1500
5000
mg
>800～1 000
22000
8000|| tt | | 2000 | | tt | | 8000 | | tt | %, and should be evenly distributed on both sides of the seam. 7 Machine tool dry running test
7.1 Temperature rise test
The main motion mechanism of the machine tool starts from low speed and operates at low, medium and high speed (machine tools with step speed change should start from the lowest speed and operate in sequence, each level The running time of the spindle bearing and the power tool spindle bearing should be no less than 2 minutes) and the maximum speed should be run for a sufficient time (no less than 1 hour) to allow the spindle bearing and the power tool spindle bearing to reach a stable temperature. Check the temperature and temperature of the spindle bearing and the power tool spindle bearing. Lift. Its temperature shall not exceed 70℃, and its temperature rise shall not exceed 35℃.
7.2 Inspection of main motion and feed motion (spot check) 7.2.1 The actual deviation of the spindle speed and feed speed should not exceed 5% of the command value or the value indicated on the signboard. 7.2.2 The actual deviation between the power tool spindle speed and the C-axis feed speed should not exceed 5% of the command value or the value indicated on the signboard. 7.3 Action test
7.3.1 Use buttons, switches or manual control to conduct the following action test on the machine tool to test the flexibility and reliability of its action: 8. Select any spindle speed and power tool spindle speed, and start the spindle Continuous testing of forward rotation, reverse rotation, stopping (including braking) with the power tool spindle, and continuous operation for no less than 7 times; b. The spindle and power tool spindle are tested for low, medium and high speed conversion; c.Select any feed speed (or feed amount), control the start, feed and stop actions continuously, and perform working feed and rapid feed tests on the entire stroke of the Z-axis, X-axis, and C-axis. The rapid feed test of Z-axis and X-axis can be carried out on more than 1/2 full stroke. Continuous operation in the forward and reverse directions for no less than 7 times;
Do conversion tests of low, medium and high feed speeds (or feed amounts) on the entire stroke of the B-axis, X-axis, and C-axis; d
Do the feed test of slide plate, slide plate and C' axis with manual pulse generator or single step; e.
f.
g.
The tailstock and the tailstock sleeve are manually or motorized to perform a moving test on their entire stroke; the moving parts with locking mechanisms are tested for locking at any position throughout their entire stroke, and the sliding plates of the inclined and vertical guide rails are cut off from the power. Should not be left behind:
h.
i.
j.
k.
1
m.||tt| |The C-axis with indexing positioning mechanism undergoes indexing positioning tests; the rotary tool holder undergoes various indexing tests;
performs installation and disassembly tests of tools and fixtures; the chip removal device undergoes operation tests; ||tt| |Functional testing of various indicators, readers, ventilation systems, etc. of digital control devices; functional testing of safety, insurance, and protective devices of machine tools; sealing, lubrication, and cooling performance testing of hydraulic, lubrication, and cooling systems, requiring easy adjustment and action Flexible, well lubricated, fully cooled, and no leakage in each system.
37
JB/T 4368.3—96
7.3.2 Use CNC instructions or control belt machine tools to do the following action tests to test the flexibility and reliability of their actions. a. The spindle and power tool spindle are tested for forward rotation, reverse rotation, stop and change of speed (continuously variable transmission mechanism is used for low, medium and high speed, and stepped transmission mechanism is used for various speeds);
b. The feed mechanism conducts low, medium and high feed speed (or feed amount) and rapid feed conversion tests; the C-axis with indexing positioning mechanism conducts indexing positioning tests; c.
C' axis, X-axis and Z-axis linkage test;
d.
e.
Rotary tool holder for various indexing tests;
f, super test feed coordinate Program protection, manual data input, coordinate position display, reference point return, program number indication and retrieval, program pause, program end, program elimination, single-step feed, linear interpolation, arc interpolation, linear cutting cycle, The reliability of taper cutting cycle, thread cutting cycle, arc cutting cycle, tool position compensation, pitch compensation, gap compensation and other functions and the flexibility of action. No-load running power test (spot check)
7.4
The no-load running power of the main transmission system shall comply with the provisions of the design document. 6. Continuous dry running test of the whole machine
7.5
Use CNC program to simulate the working state under all functions to do continuous dry running test without cutting. Failure should not occur during the entire operation. The continuous idle running time is 48 hours, each cycle time is not more than 15 minutes, and the rest time between each cycle should not exceed 1 minute. 8 Machine tool load test
This series of machine tools should undergo the following load test: a. Maximum torque test of main transmission system;
Maximum cutting resistance test;
b.
Test of maximum power of main transmission system (spot check); c.
Vibration resistance Cutting test (spot check).
d.
The CNC horizontal lathe that is only used to process bar materials only performs the maximum power test of the main transmission system. 8.1 The maximum torque test and maximum cutting resistance test of the main transmission system are tested by powerful turning of the outer circle. When measuring with a cutting dynamometer, the torque is calculated according to formula (2). When measuring with a power meter (or ammeter and voltmeter) or tachometer, the torque is calculated according to formula (3). The main component of the cutting resistance is calculated according to formula ( 4) Calculate and determine the cutting resistance of the machine tool based on the main component force and tool angle.
T= Fr
T α 9 550(P - P.)
F ~ 9 550(PP.)
rm
where: T—torque, N·m
F—the main component of the cutting resistance, F in formula (2) is the main component of the pre-cutting resistance measured with a cutting dynamometer, N; P—— -The input power of the motor during cutting (referring to the power supplied by the power grid to the motor), kWP. -The idling power of the machine tool when the workpiece is installed (referring to the power supplied to the motor by the power grid), kW; r--the cutting radius of the workpiece, m ;
n--Spindle speed, r/min.
8.1.1 The material, type and cutting amount of the tool are specified by the manufacturer. 8.1.2 Test piece material and size
Test piece material: 45 steel
Test piece size: 0≤D/2,1=D/4
8.2 The main transmission system reaches the maximum Power test 38
(2)
(3)
(4)
Test with high-speed turning of the outer circle.
JB/T 4368.3--96
8.2.1 The material, type and cutting amount of the tool are specified by the manufacturer. 8.2.2 Test piece material and size
Test piece material: 45 steel
Test piece size: During chuck processing, D=D/4～D./2, 1=D./4 When bar processing, D=d, l=1.5d
8.3 Vibration resistance cutting test
Conduct the vibration resistance cutting test with the limit cutting width as specified in Figure 1. Figure 1
8.3.1 Test conditions
Before the test, the machine tool runs at medium speed until the spindle bearing reaches a stable temperature. Before the cutting test, the new tool should be tested three times, with a cutting depth of about 0.5mm each time. 8.3.2 Tool
Geometric angle: =6°α=6°
Tool material: YT15
Tool installation height: should not be higher than 0.5mn above the spindle axis. 8.3.3 Test piece
Test piece material: 45 steel
Test piece size: D0.2D, =1.5D
8.3.4 Cutting amount
Cutting speed: u=100～120 m/min
Feed: f=0.1 mm/r
Cutting depth: a>7 mmbzxZ.net
8.3.5 Limit cutting width||tt| |D.≤500blm=0.020D.;D>500: bm=0.015D, (minimum is 10mm) Note: If the limit cutting width does not reach 0.020D during cutting. However, the cutting power has reached the maximum power specified in the design and the machine tool does not vibrate, so the assessment will be based on the measured limit cutting width at this time. The machine tool should not vibrate when tested under the above conditions. 9 Machine tool accuracy inspection
9.1 Accuracy inspection shall be carried out in accordance with GB/T16462. 9.2 G4, G11, G12, G13, P1, P2, P3, P4, P5 and other items should be inspected when the machine tool reaches medium speed and stable temperature. 9.3 Reverse difference test
Before gap compensation, perform the test according to the inspection method of item G18 in GB/T16462. The reverse difference value should comply with the provisions of Table 3. 39
Maximum turning length
1000
>1 000~5 000
JB/T4368.3—96
Table 3
Z-axis
0.025
0.030
9.4 The axial movement of the ball screw shall not be greater than 0.005mm. 9.5
The working accuracy inspection is carried out according to the cutting specifications specified in the design document. The reverse difference
X axis
0.015
mm
9.6 Working accuracy inspection The surface roughness Ra value of the specimen should not be greater than 0.8 μm (the surface roughness Ra value of the P5 specimen is 1.6 μm).
9.7 Return to reference point test
The return to reference point test shall comply with the provisions of Table 4 and Table 5. Table 4
Simplified
Z axis
Graph
Ct axis
D,500
Z axis 0.004
Trial
Test
Fang
Method
Make the slide or skateboard travel quickly from any point on the Z-axis or X-axis Move back to the base push point, measure its actual position, and conduct at least five returns to the base point test.
Z-axis and X-axis reference point errors are calculated separately. The error is calculated as the maximum difference of five measurements
The C-axis quickly rotates from any point back to the reference point, measures its actual position, and performs at least five return to the reference point tests. The error is calculated as the maximum difference of five measurements
Table 5
Return
Back to base
Dimension
Point
Try|| tt||check
's
charge
Test under the condition, 9.7.1
Difference
D,≥>500
Z axis 0.005
Inspection Tools
Laser Interferometer|| tt||Indicator
Indicator
mm
9.7.2 Return to reference point test is only applicable to machine tools with fixed reference points, and the actual size of the reference point needs to be detected. 9.8 Minimum set unit feed test
The minimum set unit feed test is carried out according to Table 6. 40
Test method diagram
Minimum set number of actual moving distance equivalent to one set unit
JB/T 4368.3—96
Table 6|| tt||Test method
Make the slide or skateboard move in the positive (or negative) direction at a rapid feed speed, using the stopped position as the base push, and then give a minimum setting unit instruction each time. Move in the same direction a distance equivalent to approximately 20 set unit commands, and measure the stopping position of each command. Then, starting from the above-mentioned most natural position, give a minimum set unit instruction each time, move in the negative (or positive) direction, and approximately return to the reference position. Measure the stopping position of each instruction. Measure at least three positions in the middle and near both ends of the stroke. Measurement points within the actual moving distance equivalent to several set units after return are excluded.
The error is calculated as the maximum difference between the distance between adjacent stop positions and the minimum setting unit.
That is: error value = |L—m!max
Where: L is the distance between adjacent stop positions; m is the minimum setting unit.
Both X-axis and Z-axis should be inspected
Inspection tools
Laser interferometer
Indicator
9.8.1 When measuring a certain coordinate, In principle, other moving parts should be placed in the middle or stable position of the stroke. 9.9 Dimensional dispersion of finished turning test pieces
The dimensional dispersion of finished turning test pieces shall comply with the provisions of Table 7. Table 7
Simple diagram
Feed Lu line
Chuck processing: D0.2D
I=D
Bar processing: D=( 0.8~~1)d,
D
Material: Y12 or aluminum
Checking properties
According to CNC
Cutting conditions
a0.1
Program continuous
fauo. 1
cut five, mm/t
test piece, add
work the next one||tt ||When cutting the test piece
The frame must be rotated
360°
Inspection items
Fine turning test
Dimensions of the piece
Dispersion:
a. Straight
diameter size points
Divergence:
b. Length
Degree Size Minutes
Divergence
Charge
D ≤500 D.>500
a and b
0.020| |tt||0.025
Inspection Tools
Micrometer
Said
mm
Ming
Refer to JB2670||tt| |Relevant provisions
3.1,3.2.2,4.1
Measure the
maximum change value W of the diameter (or length) dimensions of five test pieces, ruler| |tt||The inch dispersion is
2.58W
41
Additional remarks:
JB/T 4368.3--96
Proposed by the Metal Cutting Machine Tool Standardization Technical Committee. This standard is under the jurisdiction of the Automatic Lathe Branch and the Lathe Branch. This standard is drafted by Nanjing Machine Tool Factory. Shenyang No. 3 Machine Tool Factory, Shenyang No. 1 Machine Tool Factory, Shanghai No. 2 Machine Tool Factory, Great Wall Machine Tool Factory, Jinan No. 1 Machine Tool Factory, and Dalian Machine Tool Factory participated in the drafting. This standard was first released in December 1986. 42
3--96
This standard is proposed by the National Metal Cutting Machine Tool Standardization Technical Committee. This standard is under the jurisdiction of the Automatic Lathe Branch and the Lathe Branch. This standard is drafted by Nanjing Machine Tool Factory. Shenyang No. 3 Machine Tool Factory, Shenyang No. 1 Machine Tool Factory, Shanghai No. 2 Machine Tool Factory, Great Wall Machine Tool Factory, Jinan No. 1 Machine Tool Factory, and Dalian Machine Tool Factory participated in the drafting. This standard was first released in December 1986. 42
3--96
This standard is proposed by the National Metal Cutting Machine Tool Standardization Technical Committee. This standard is under the jurisdiction of the Automatic Lathe Branch and the Lathe Branch. This standard is drafted by Nanjing Machine Tool Factory. Shenyang No. 3 Machine Tool Factory, Shenyang No. 1 Machine Tool Factory, Shanghai No. 2 Machine Tool Factory, Great Wall Machine Tool Factory, Jinan No. 1 Machine Tool Factory, and Dalian Machine Tool Factory participated in the drafting. This standard was first released in December 1986. 42
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