JB/T 10165.2-1999 Technical requirements for CNC longitudinal cutting automatic lathes
Some standard content:
JB/T 10165.2--1999
This standard is based on the structural characteristics of CNC slitting automatic lathes, meets the requirements of users and summarizes the production practice experience. It is a concretization and supplement to GB/T9061-1988 "General Technical Conditions for Metal Cutting Machine Tools", JB/T9872--1999 "General Technical Conditions for Machining Parts of Metal Cutting Machine Tools" and JB/T9874--1999 "General Technical Conditions for Assembly of Metal Cutting Machine Tools". This standard is part of JB/T10165 "CNC Slitting Automatic Lathes". This series of standards includes the following two parts: Part 1 (i.e. JB/T10165.1): Accuracy inspection of CNC slitting automatic lathes; Part 2 (i.e. JB/T10165.2): Technical conditions for CNC slitting automatic lathes. This standard is proposed by the National Technical Committee for Metal Cutting Machine Tools Standardization. This standard is under the jurisdiction of Chengdu Instrument and Machine Tool Research Institute. The responsible drafting unit of this standard is Ningjiang Machine Tool Factory. The main drafters of this standard are Chen Yongming, Qian Wenming, Wang Guikang, Cai Puxun and Wang Hui. 184
1 Scope
Machinery Industry Standard of the People's Republic of China
CNC Sliding Head Automatic Lathe
Technical Conditions
This standard specifies the requirements for the manufacture and acceptance of CNC Sliding Head Automatic Lathes. This standard is applicable to CNC Sliding Head Automatic Lathes with a maximum bar diameter of 32mm and ordinary precision. 2 Referenced Standards
JB/T 10165.2—1999
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T9061-1988 Metal cutting machine tools, general technical conditions GB/T9239-1988 Determination of the permissible imbalance of rigid rotor balance quality GB/T16769-1997 Metal cutting machine tool noise sound pressure level measurement method GB/T17421.2-2000 General rules for machine tool inspection Part 2: Determination of positioning accuracy and repeatability of CNC axis JB/T9872-1999 General technical conditions for machining parts of metal cutting machine tools JB/T9874—1999 General technical conditions for metal cutting machine tool assembly JB/T9877—1999 Determination of cleanliness of metal cutting machine tools JB/T10165.1-1999 Accuracy inspection of CNC longitudinal cutting automatic lathes 3 General requirements
3.1 When accepting machine tools according to this standard, the remaining relevant acceptance items in GB/T9061.JB/T9872 and JB/T9874 that are not specified in this standard should be inspected at the same time. 3.2 The movement direction of the machine tool coordinate axis is defined as the direction parallel to the spindle axis as the Z axis, and the direction perpendicular to the spindle axis as the X axis. 4 Accessories and tools
4.1 In order to ensure the basic performance of the machine tool, the following accessories and tools should be randomly supplied: a) Spring chuck, maximum specification one piece;
b) Center frame sleeve, maximum specification one piece; c) Special adjustment tool, one set;
d) Washer, one set.
4.2 Special accessories to expand the performance of machine tools are supplied according to user requirements and agreements. 5 Processing and assembly quality
5.1 The base, bed, spindle box and carriage are important castings and should be aged after rough processing. 5.2 The bed guide pair is an important guide pair and wear-resistant measures such as wear-resistant cast iron, steel guide, plastic guide, rolling guide and induction quenching should be adopted.
5.3 The following particularly important fixed joint surfaces shall be assessed according to the requirements of Class IV machine tool accuracy in JB/T9874: Approved by the State Bureau of Machinery Industry on October 8, 1999 and implemented on March 1, 2000
a) Joint surface between bed and base;
b) Joint surface between spindle box support and base;
c) Joint surface between spindle box and spindle box support; JB/T 10165.2—1999
d) Joint surface between center guide sleeve seat, pad and carriage; e) Joint surface between turret body seat, pad and carriage. 5.4 The sliding (rolling) guideway pairs of Z axis and X axis shall be assessed according to the requirements of Class IV machine tool accuracy in JB/T9874. 5.5 The high-speed rotating spindle assembly shall be subjected to balance test and calibration after assembly, and the balance level shall comply with G6.3 of GB/T9239. The allowable unbalance (i.e. eccentricity) is calculated according to formula (1): 60
eper 6. 3(
The allowable residual unbalance (i.e. weight-diameter product) is calculated according to formula (2): = me
Where: eper-—allowable imbalance, μm; μ-—allowable residual imbalance, g·mm; mass of rotating body, kg;
-rotating body rotation speed, I/min
6×104
6×104
When the maximum rotation speed nmax is greater than or equal to 8000r/min, a dynamic balance test and correction should be carried out; when nmx is less than 8000r/min, a static balance test and correction are allowed. 5.6 The cleanliness shall be inspected in accordance with the provisions of JB/T9877, and the cleanliness of the inside of the spindle box shall be inspected by weight method. Its impurities and dirt shall not exceed the provisions of Table 1 (spot check, in batch production, 5% spot check, but not less than one machine). Table 1
Inspection part
D<16 mm
Spindle box
Maximum bar diameter
D≥16 mm
5.7 The following important locating pins (the number may be increased or decreased according to the machine tool structure) should be inspected by the color coating method, and their contact length should not be less than 60% of the working length:
a) locating pins between the spindle box and the spindle box support; b) locating pins between the center guide sleeve seat and the slide; c) locating pins between the turret body seat and the slide;
d) locating pins of the ball screw bracket.
6 Machine tool idling test
6.1 Temperature rise test
The main motion mechanism of the machine tool should be tested for idling from the lowest to the highest speed step by step. The running time of each speed should not be less than 2min. The machine tool with exchange gears, pulleys and stepless speed change can be operated at low, medium and high speeds. The highest speed should be operated for a sufficient time (not less than 1h) to make the spindle bearing reach a stable temperature, and its temperature and temperature rise should be checked near the spindle bearing. It should not exceed the following regulations: Rolling bearing: temperature 70℃ temperature rise 40℃
Sliding bearing: temperature 60℃ temperature rise 30℃
6.2 Spot check the actual deviation of the spindle speed and feed rate, which should not exceed 2% to +6% of the nominal value. 6.3 The idling power of the main transmission system should comply with the provisions of the design documents (spot check). 6.4 Each moving part should move smoothly, flexibly and reliably, without obvious creeping and vibration. 6.5 The noise of the machine tool shall be tested in accordance with the provisions of GB/T16769. The sound pressure level of the machine tool noise shall not exceed 83dB(A). The measurement of machine tool noise 186
JB/T10165.2-1999
shall be carried out under the condition of idling at three speeds: low, medium and high. The noise shall be measured with the bar stock when running at high speed. The bar stock shall be a straightened, non-bent, high-precision, polished, easy-to-cut steel bar stock with a length of not less than 2m. The bar stock diameter shall be calculated according to formula (3). Where: d—bar stock diameter, mm;
d=1 000
—maximum cutting speed for machine tool calculation, m/min (recommended 100m/min); nmax——maximum spindle transmission speed of the machine tool, r/min. 6.6 Functional test of the machine tool
The following functions of the machine tool shall be tested using buttons, switches and CNC commands. .(3)
6.6.1 When the spindle is at medium speed, the operation test of starting, stopping (including braking) and orientation shall be carried out continuously for 10 times. The action shall be flexible and reliable. 6.6.2 The switching test of the spindle at low, medium and high speed shall be carried out. The action shall be flexible and reliable. 6.6.3 For each moving part, the operation test of starting, stopping and incremental feeding in positive and negative directions shall be carried out continuously for seven times at medium feed speed over the full stroke. The rapid stroke shall be greater than 1/2 of the full stroke. The action shall be flexible, reliable and accurate. 6.6.4 The operation test of low, medium and high feed speed and rapid speed change shall be carried out over the full stroke of Z and X axes. The action shall be flexible and reliable. 6.6.5 The CNC functions such as over-travel protection, manual data input, coordinate position display, program number indication and retrieval, program pause, program end, program deletion, single-step feed, linear interpolation, circular interpolation, various cutting cycles and compensation of the test motion coordinates shall be reliable. 6.6.6 The hydraulic, pneumatic, lubrication and cooling systems should be tested for sealing, lubrication and cooling. They should be easy to adjust, flexible in movement, well lubricated, adequately cooled and leak-free.
6.6.7 The functions of various indicator lights, control buttons and their auxiliary devices in the electrical system should be intact and flexible and reliable in movement. 6.7 Continuous idling test of the whole machine
6.7.1 Use the CNC program including the main processing functions of the machine tool to conduct non-cutting continuous idle operation test on each part of the machine tool, and the operation time shall not be less than 32 hours.
6.7.2 The continuous idle operation and program shall include the following contents: a) The spindle shall include low, medium and high speed forward and reverse operation, start and stop, of which the high-speed operation time shall not be less than 20% of the time used for each cycle program;
b) Each moving part shall include low, medium and high feed speeds and fast forward and reverse high-speed operation, and the operation shall be carried out within the full stroke or close to the full stroke range, and any point shall be selected for positioning. Among them, the high feed speed and fast running time should not be less than 10% of the time used for each cycle program;
c) Automatic positioning and indexing of the tool holder;
d) Entry, exit and position change of the auxiliary device; e) The linkage of each axis;
f) The pause time between each cycle program should not exceed 0.5min; g) If there are abnormal phenomena or failures in the test of other major CNC functions of the machine tool, the test should be repeated after the cause is found and eliminated. 7 Machine tool load test
7.1 This series of machine tools should be tested for maximum cutting depth by turning the outer circle (spot check, 5% spot check in batch production, but not less than one-set).
The test shall meet the following conditions:
a) Test piece material: 45 steel:
b) Maximum bar diameter;
c) The length of the bar overhanging the spindle clamping end face shall be specified by the manufacturer; 187
JB/T10165.2—1999
d) The cutting length is equal to 1/3 of the maximum turning length; e) A total of three pieces are cut in the test.
The cutting amount, material and geometric parameters of the tool shall be specified by the manufacturer. The use of a rotary center stand test is allowed. When conducting the maximum cutting depth test, the machine tool should work normally, and each motion mechanism should be flexible and reliable. 7.2
7.3 The cutting length of the test piece should be checked, and its tolerance is h14. 8 Minimum setting unit test
Test method
The length detection device is installed on the detection coordinate. First, quickly move the moving part on the detection coordinate in the positive (or negative) direction to the detection position, and after stopping, give several instructions of the minimum setting unit in the same direction, and then stop again. Use this position as the reference position, and then give one instruction in the same direction at a time, and give 20 instructions of the minimum setting unit in total, and measure the stop position of each instruction. From the above-mentioned final position, continue to give several instructions of the minimum setting unit in the same direction, and after stopping, give several instructions of the minimum setting unit in the negative (or positive) direction, and return to the above-mentioned final measurement position. These instructions of several minimum setting units in the negative (or positive) direction are not measured. Then, starting from the above-mentioned final position, give one instruction at a time, and give 20 instructions of the minimum setting unit in total, return to the reference position, and measure the stop position of each instruction, see Figure 1. The test should be carried out at three positions in the middle of the stroke and near the two ends. Calculate the error according to the provisions of 8.2, and take the maximum error value at the three positions as the error.
It is allowed to test with the use of pitch error and clearance compensation devices. Both X and Z axes need to be inspected.
Actual moving distance
8.2 Error calculation method
Reference position
8.2.1 The minimum setting unit error S is calculated according to formula (4): e
S =/ L, -m lmax
Where: L.1)
The actual displacement of the minimum setting unit instruction, mm; 1) If the direction of the actual displacement is opposite to the given direction, the displacement should be negative. 188
When returning, the minimum setting
unit instruction is not measured. Distance height
Number of minimum setting unit instructions
（4）
JB/T10165.2—1999
The theoretical displacement of the minimum setting unit instruction, mm. 8.2.2 The relative error S of the minimum setting unit is calculated according to formula (5): -20m
Where:
8.3 The difference
×100%
The sum of the actual displacements of the -20 minimum setting unit instructions, mm. Sa: Specified by the manufacturer;
St: should not exceed 25%.
8.4 Inspection tool
Length detection device.
Return to reference point testbzxz.net
9.1 Test method
The non-detected moving parts should be placed in the middle of the stroke or in a stable position. (5)
On the full stroke of the detection coordinate, perform five tests of returning to the reference point P. quickly from any position in the same moving direction. Measure the deviation X (i=1,2,,5) between the actual position P and the theoretical position P. of the reference point each time, see Figure 2. Po
The test should be carried out at three positions in the middle of the stroke and near the two ends. Calculate the error according to the provisions of 9.2, and take the maximum error value at the three positions as the error of this item
It is allowed to test with the use of pitch error and clearance compensation device. Both X and Z axes need to be inspected.
9.2 Error calculation method
In each detection coordinate, the maximum value of 4 times the standard uncertainty during the return reference point test is the return reference point error. That is: R. = 4S.
Where: R-
Return reference point error, mm;
S,2>——Standard uncertainty of return reference point, mm. 9.3 Tolerance
Z axis: 0.012 mm;
X axis: 0.006 mm.
9.4 Inspection tool
Length detection device.
2) S; Calculate according to GB/T 17421.2. (6)
Machine tool accuracy inspection
JB/T 10165.2—1999
10.1 The accuracy inspection of the return wheel tool holder type machine tool shall be in accordance with the provisions of JB/T10165.1. Other structural types of machine tools shall be in accordance with the provisions of relevant technical documents.
10.2 The two tests of the parallelism of the G5 longitudinal slide movement to the spindle axis and the coincidence of the G6 center frame guide hole axis to the spindle axis in JB/T10165.1-1999 shall be carried out when the machine tool spindle reaches the medium speed stable temperature. 10.3 When inspecting the working accuracy, the maximum allowable value of the surface roughness Ra of the diameter of the P1 test piece in JB/T10165.1-1999 (within the range of H2) after processing is 1.6μm.3 The cutting length of the test piece should be checked, and its tolerance is h14.8 Minimum setting unit test
Test method
The length detection device is installed on the detection coordinate. First, quickly move the moving part on the detection coordinate to the detection position in the positive (or negative) direction, stop and give several instructions of the minimum setting unit in the same direction, then stop again, use this position as the reference position, and then give one instruction in the same direction at a time, give a total of 20 instructions of the minimum setting unit, and measure the stop position of each instruction. From the above-mentioned final position, continue to give several instructions of the minimum setting unit in the same direction, stop and give several instructions of the minimum setting unit in the negative (or positive) direction, and return to the above-mentioned final measurement position. These several instructions of the minimum setting unit in the negative (or positive) direction are not measured. Then, starting from the above-mentioned final position, give one instruction at a time, give a total of 20 instructions of the minimum setting unit, return to the reference position, and measure the stop position of each instruction, see Figure 1. The test should be carried out at three positions in the middle of the stroke and near both ends. Calculate the error according to the provisions of 8.2, and take the maximum error value at the three positions as the error.
It is allowed to test with the pitch error and clearance compensation device. Both X and Z axes need to be tested.
Actual moving distance
8.2 Error calculation method
Reference position
8.2.1 The minimum setting unit error S is calculated according to formula (4): e
S =/ L, -m lmax
Where: L.1) The actual displacement of the minimum setting unit instruction, mm; 1) If the direction of the actual displacement is opposite to the given direction, the displacement should be a negative value. 188
When returning, the minimum setting
unit instruction is not measured from the height
Number of minimum setting unit instructions
（4）
JB/T10165.2—1999
Theoretical displacement of the minimum setting unit instruction, mm. 8.2.2 Minimum setting unit relative error S, calculated according to formula (5): -20m
Where:
8.3 Filling difference
×100%
The sum of the actual displacements of -20 minimum setting unit instructions, mm. Sa: Specified by the manufacturer;
St: should not exceed 25%.
8.4 Inspection tool
Length detection device.
Return reference point test
9.1 Test method
The non-detected moving parts should be placed in the middle of the stroke or in a stable position. (5)
On the whole stroke of the detection coordinate, from any position in the same moving direction, quickly perform five tests to return to the reference point P. . Measure the deviation X (i=1,2,,5) between the actual position P and the theoretical position P of the reference point each time, see Figure 2. Po
The test should be carried out at three positions in the middle of the stroke and near the two ends. Calculate the error according to the provisions of 9.2, and take the maximum error value at the three positions as the error of this item
It is allowed to carry out the test when using the pitch error and clearance compensation device. Both the X and Z axes need to be tested.
9.2 Error calculation method
In each detection coordinate, the maximum value of 4 times the standard uncertainty during the return to reference point test is the return to reference point error. That is: R. = 4S.
Where: R-
Return to reference point error, mm;
S,2>——Standard uncertainty of return to reference point, mm. 9.3 Tolerance
Z axis: 0.012 mm;
X axis: 0.006 mm.
9.4 Inspection tool
Length detection device.
2) S; Calculate according to GB/T 17421.2. (6)
Machine tool accuracy inspection
JB/T 10165.2—1999
10.1 The accuracy inspection of return wheel tool holder type machine tools shall be in accordance with the provisions of JB/T10165.1. Other structural types of machine tools shall be in accordance with the provisions of relevant technical documents.
10.2 The two tests of G5 longitudinal slide movement parallelism to the spindle axis and G6 center frame guide hole axis coincidence with the spindle axis in JB/T10165.1-1999 shall be carried out when the machine tool spindle reaches the medium speed stable temperature. 10.3 During the working accuracy inspection, the maximum allowable surface roughness Ra of the P1 specimen after machining (within the H2 range) in JB/T10165.1-1999 is 1.6μm.3 The cutting length of the test piece should be checked, and its tolerance is h14.8 Minimum setting unit test
Test method
The length detection device is installed on the detection coordinate. First, quickly move the moving part on the detection coordinate to the detection position in the positive (or negative) direction, stop and give several instructions of the minimum setting unit in the same direction, then stop again, use this position as the reference position, and then give one instruction in the same direction at a time, give a total of 20 instructions of the minimum setting unit, and measure the stop position of each instruction. From the above-mentioned final position, continue to give several instructions of the minimum setting unit in the same direction, stop and give several instructions of the minimum setting unit in the negative (or positive) direction, and return to the above-mentioned final measurement position. These several instructions of the minimum setting unit in the negative (or positive) direction are not measured. Then, starting from the above-mentioned final position, give one instruction at a time, give a total of 20 instructions of the minimum setting unit, return to the reference position, and measure the stop position of each instruction, see Figure 1. The test should be carried out at three positions in the middle of the stroke and near both ends. Calculate the error according to the provisions of 8.2, and take the maximum error value at the three positions as the error.
It is allowed to test with the pitch error and clearance compensation device. Both X and Z axes need to be tested.
Actual moving distance
8.2 Error calculation method
Reference position
8.2.1 The minimum setting unit error S is calculated according to formula (4): e
S =/ L, -m lmax
Where: L.1) The actual displacement of the minimum setting unit instruction, mm; 1) If the direction of the actual displacement is opposite to the given direction, the displacement should be a negative value. 188
When returning, the minimum setting
unit instruction is not measured from the height
Number of minimum setting unit instructions
（4）
JB/T10165.2—1999
Theoretical displacement of the minimum setting unit instruction, mm. 8.2.2 Minimum setting unit relative error S, calculated according to formula (5): -20m
Where:
8.3 Filling difference
×100%
The sum of the actual displacements of -20 minimum setting unit instructions, mm. Sa: Specified by the manufacturer;
St: should not exceed 25%.
8.4 Inspection tool
Length detection device.
Return reference point test
9.1 Test method
The non-detected moving parts should be placed in the middle of the stroke or in a stable position. (5)
On the whole stroke of the detection coordinate, from any position in the same moving direction, quickly perform five tests to return to the reference point P. . Measure the deviation X (i=1,2,,5) between the actual position P and the theoretical position P of the reference point each time, see Figure 2. Po
The test should be carried out at three positions in the middle of the stroke and near the two ends. Calculate the error according to the provisions of 9.2, and take the maximum error value at the three positions as the error of this item
It is allowed to carry out the test when using the pitch error and clearance compensation device. Both the X and Z axes need to be tested.
9.2 Error calculation method
In each detection coordinate, the maximum value of 4 times the standard uncertainty during the return to reference point test is the return to reference point error. That is: R. = 4S.
Where: R-
Return to reference point error, mm;
S,2>——Standard uncertainty of return to reference point, mm. 9.3 Tolerance
Z axis: 0.012 mm;
X axis: 0.006 mm.
9.4 Inspection tool
Length detection device.
2) S; Calculate according to GB/T 17421.2. (6)
Machine tool accuracy inspection
JB/T 10165.2—1999
10.1 The accuracy inspection of return wheel tool holder type machine tools shall be in accordance with the provisions of JB/T10165.1. Other structural types of machine tools shall be in accordance with the provisions of relevant technical documents.
10.2 The two tests of G5 longitudinal slide movement parallelism to the spindle axis and G6 center frame guide hole axis coincidence with the spindle axis in JB/T10165.1-1999 shall be carried out when the machine tool spindle reaches the medium speed stable temperature. 10.3 During the working accuracy inspection, the maximum allowable surface roughness Ra of the P1 specimen after machining (within the H2 range) in JB/T10165.1-1999 is 1.6μm.
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