JB/T 8330.2-1996 Technical requirements for CNC profile fixed beam gantry boring and milling machines
Some standard content:
Mechanical Industry Standard of the People's Republic of China
CNC Profile Fixed Beam Gantry Boring and Milling Machine
Technical Conditions
Subject Content and Scope of Application
This standard specifies the requirements for the manufacture and acceptance of CNC profile fixed beam gantry boring and milling machines. JB/T 8330.2—96
This standard applies to CNC profile fixed beam gantry boring and milling machines with a worktable width of 1000 to 2500 mm. 2 Reference standards
GB5226
GB 9061
JB4139
Electrical equipment of machine tools
General technical conditions
Metal cutting machine tools
General technical conditions
Technical conditions for safety protection of metal cutting machine tools and machine tool accessoriesJB/T8330.1 Accuracy of CNC profile fixed beam gantry boring and milling machinesZB J50 003
ZB J50 004
Determination of cleanliness of metal cutting machine tools
Determination of sound pressure level of noise of metal cutting machine toolsZBn J50 008. 1
ZBn J50 008.2
ZBn J50 008. 3
General technical conditions for machining parts of metal cutting machine tools General technical conditions for welding parts of metal cutting machine tools General technical conditions for assembly of metal cutting machine tools
General technical conditions for hydraulic systems of metal cutting machine tools
ZB J50 016
3—General requirements
This standard specifies and supplements GB9061, ZBnJ50008.1, ZBnJ50008.2, ZBnJ50008.3 and other standards. 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
The accessories and tools listed in Table 1 should be supplied randomly. Table 1
Special wrench
Tool mounting accessories
Pull nail, pull rod
Profiling finger
Special measuring block
Anchor screw, nut, washer, adjustment shim 4.2 The following special accessories can be supplied according to the agreement: a. Right angle milling head;
b. Universal angle milling head;
Installation and adjustment and disassembly and assembly of machine tools
Installation of tools
Clamping tools
Automatic compensation of profiling finger
Installation of machine tools
Quantity approved by the Ministry of Machinery Industry of the People's Republic of China on April 11, 1996
Implementation on October 1, 1996
c. Extended spindle head;
d. Profiling fingers of various specifications
5 Safety and Health
5.1 The bed and the cross-dyeing guide surface should be equipped with protective devices. JB/T 8330.2--96
5.2 The movement of moving parts such as the workbench, boring and milling head, and slide should be equipped with limit or collision prevention safety devices. 5.3 The machine tool broaching mechanism must be safe and reliable. 5.4 Moving parts that are not allowed to move at the same time shall not be linked. 5.5 The machine tool noise shall be inspected in accordance with the provisions of ZBJ50004. The machine tool noise measurement shall be carried out under the condition of idling at various speeds. The sound pressure level of the whole machine noise shall not exceed 85dBA).
5.6 When accepting the machine tool according to this standard, the remaining acceptance items in JB4139 that are not specified in this standard and the acceptance items specified in GB5226 and ZBJ50016 and other standards must be inspected at the same time. 6 Processing and assembly quality
6.1 The bed, worktable, column, crossbeam, ram and slide are important castings. After rough processing, they should be aged or other measures should be taken to eliminate internal stress.
6.2 The spindle, spindle sleeve, screw pair, worm gear pair and high-speed, heavy-loaded gears and other parts should take wear-resistant measures that are suitable for their service life. 6.3 The bed and worktable guide pair, the crossbeam and slide guide pair, and the slide and ram guide pair are important guide pairs. High (medium) frequency quenching, steel inlay, hardened steel belt, plastic coating and other wear-resistant measures should be adopted. 6.4 The following joint surfaces shall be assessed according to the requirements of “important fixed joint surfaces”: the joint surface between the bed and the bed;
the joint surface between the column and the crossbeam;
the joint surface between the column and the bed;
the joint surface between the main transmission box and the ram;
the joint surface between the boring and milling head feed box and the crossbeam; the joint surface between the worktable feed box and the bed; the joint surface between the profiling bracket and the boring and milling head;
the joint surface between the profiling head and the profiling bracket;
the joint surface between the end face of the boring and milling head and the accessory milling head; the joint surface between the worm box and the bed.
6.5 The following joint surfaces shall be assessed according to the requirements of “particularly important fixed joint surfaces”: a.
the joint surface between the rack and the worktable;
the joint surface between the ball screw support, the nut seat and its accessories. 6.6 The following guide rails shall be assessed according to the requirements of "static pressure, sliding (rolling) guide rails": a
Bed and workbench guide rails; bZxz.net
Slide and crossbeam guide rails;
Ram and slide rails.
6.7 Profile bracket guide rails shall be assessed according to the requirements of "displacement guide rails". 6.8 Cleanliness shall be inspected according to the provisions of ZBJ50003, and the internal cleanliness of the main transmission box and hydraulic box shall be inspected by weight method (spot check). The weight of impurities and dirt: the main transmission box shall not exceed 400mg/L and the hydraulic box shall not exceed 200mg/L. 6.9 Inlaid steel guide rails must be inspected by flaw detection and no cracks shall be found. 6.10 Welded parts and welded components must comply with the relevant provisions of ZBnJ50008.2. Important welded parts shall be inspected by flaw detection and no cracks shall be found.
7 Idle running test of machine tools
7.1 The main motion mechanism of the machine tool starts to run in sequence from the low speed of the spindle (the machine tool with stepless speed can run at low, medium and high speeds). The running time of each level shall not be less than 2 minutes, and the running time of the highest speed shall not be less than 1 hour, so that the spindle bearing reaches a stable temperature. The temperature and temperature rise shall be checked near the spindle bearing. The temperature shall not exceed 70℃, and the temperature rise shall not exceed 40℃. 7.2 The actual deviation of the spindle speed of each level of the step transmission shall not exceed -2%+6% of the indicated value on the signboard, and the actual deviation of the feed speed shall not exceed 15%~103% of the indicated value on the signboard; the actual deviation of the spindle speed and feed speed of the stepless speed transmission shall not exceed 10% of the indicated value on the signboard. The moving parts shall move smoothly, flexibly and reliably without obvious creeping and vibration. 7.3 The no-load power of the main transmission system (excluding the no-load power of the main motor) shall not exceed the provisions of Table 2 (spot check). Table 2
Rated power of main motor kw
No-load power/Rated power of main motor%25
7.4 Use manual and automatic functions to test the flexibility, stability and reliability of the machine tool movement. 7.4.1 Use medium feed speed to conduct 10 consecutive start and stop operations on the moving parts on each coordinate, respectively. The movement should be flexible and reliable.
7.4.2 The hydraulic, lubrication, cooling and pneumatic systems should be tested for sealing, lubrication, cooling and pneumatic performance. The requirements are easy adjustment, flexible movement, good lubrication, sufficient cooling, and no leakage in each system. 7.4.3 The automatic broaching and accessory changing mechanism of the machine tool should have reliable movement. 7.4.4 The functions of various indicator lights, readers, ventilation systems, etc. of the digital control device should be reliable. 7.4.5 The functions of the safety, insurance and protection devices of the machine tool must be reliable. 7.4.6 Use CNC instructions to make various parts of the machine tool move. The movement should be flexible and the CNC function should be reliable. 7.4.7 The feed mechanism is tested for low, medium, high feed and rapid feed conversion. The movement should be flexible and reliable. 7.4.8 Test the coordinate linkage, positioning, linear interpolation, circular interpolation and other CNC functions of the machine tool one by one. The functions should be reliable and the movement should be flexible and accurate.
7.4.9 Use medium speed to start, stop (including braking) and orient the spindle 10 times in a row in the forward and reverse directions. The movement should be flexible and reliable.
Perform the main motion speed conversion test step by step (at least low, medium and high speeds for stepless speed change). The operating mechanism should be flexible and reliable.
7.4.11 Perform the idling test of the profiling function in the forward and reverse directions at low, medium and high profiling speeds. The operation should be stable and reliable. The profiling finger shall not leave the mold, and there shall be no obvious creeping, jamming, shaking and other phenomena. The actual deviation of the profiling speed shall not exceed the design requirements. The idle operation time shall not be less than 2 hours. Profiling methods include:
a. Manual profiling;
b. Contour profiling;
c. Scanning profiling;
d. Blue coordinate profiling.
7.5 Carry out the continuous idle operation test of the whole machine according to the relevant contents specified in 7.4. The continuous idle operation without failure time shall not be less than 16 hours. The interval time between each automatic cycle shall not exceed 1 minute. 8 Load test of machine tool
8.1 The machine tool shall be subjected to the following load tests:
a. Operation test of the machine tool bearing the maximum weight of the workpiece (spot check); b.
Test of the maximum torque of the machine tool main transmission system; Test of the maximum cutting resistance of the machine tool;
Test of the machine tool main transmission system reaching the maximum power (spot check). d.
8.2 Operation test of the machine tool bearing the maximum weight of the workpiece 335
JB/T8330.2—96
8.2.1 A heavy object equivalent to the maximum weight of the workpiece specified in the design can be used as the workpiece and placed on the workbench to make the load uniform. 8.2.2 Test at the lowest, highest feed speed and fast speed respectively. The movement should be smooth without obvious creeping phenomenon. 8.3 Test of the maximum torque of the machine tool main transmission system 8.3.1 Within the spindle constant torque range, select an appropriate spindle speed and use milling method to conduct the test. Adjust the cutting amount. Make the main transmission system reach the maximum torque specified in the design. 8.3.2 During the cutting test, the machine tool should work normally and move smoothly. 8.3.3 The test piece material is HT200 or 45 steel, and the test cutting tool is an end mill. The cutting amount is in accordance with the provisions of the design documents. 8.4 Test of the maximum cutting resistance of the machine tool
8.4.1 Within the spindle constant torque range, select an appropriate spindle speed and use the milling method to conduct the test. Adjust the cutting amount. Make the machine tool reach the maximum cutting resistance specified in the design.
8.4.2 During the cutting test, the machine tool should work normally and move smoothly. The overload safety device should be reliable. 8.4.3 The test piece material is HT200, and the test cutting tool is an end mill. The cutting amount is in accordance with the provisions of the design documents. 8.5 Test of the main transmission system of the machine tool reaching maximum power8.5.1 Within the spindle constant power range, select an appropriate spindle speed and use the milling method to conduct the test. Adjust the cutting amount so that the machine tool reaches the maximum design power.
8.5.2 During the test, all parts of the machine tool should work normally without obvious chattering, and the metal removal rate should be recorded. 8.5.3 The test piece material is HT200, and the test cutting tool is an end mill. The cutting amount is in accordance with the provisions of the design documents. 9 Minimum setting unit test
9.1 Test method
First, quickly move the moving part on the linear coordinate to a certain distance in the positive (or negative) direction. After stopping, give several minimum setting unit instructions in the same direction, and then stop again. This position is used as the reference position. Give one at a time, and give a total of 20 minimum setting unit instructions. Move in the same direction and measure the stop position of each instruction. From the above-mentioned final position, continue to give several minimum setting unit instructions in the same direction. After stopping, give several minimum setting unit instructions in the negative (or positive) direction, and return to the above-mentioned final measurement position. The stop positions of these positive and negative minimum setting unit instructions are not measured. Then, starting from the above-mentioned final position, give one instruction at a time, a total of 20 minimum setting unit instructions, continue to move in the negative (or positive) direction, and measure the stop position of each instruction, see Figure 1. The stop position of several minimum setting
unit instructions is not measured
Actual moving distance
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Minimum setting unit
Each linear coordinate must be tested at least in the middle and at both ends of the stroke. Calculate the error according to the provisions of Article 9.2, and take the maximum error value at the three positions as the error of this item. 9.2 Error calculation method
9.2.1 Minimum setting unit error Sa
S. l L;-m Imx
Where: L.
-Actual displacement of a minimum setting unit instruction, mm; —-Theoretical displacement of a minimum setting unit instruction, mm. Note: If the direction of the actual displacement is opposite to the given direction, the displacement should be a negative value. 9.2.2 Minimum setting unit relative error S
Where: L
The sum of the actual displacements of 20 minimum setting unit instructions, mm. 9.3 Tolerance
S.: According to the design regulations of the manufacturer;
Sb: shall not exceed 25%.
9.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 10 Origin return test
10.1 Test method
.....(1)
The moving parts on each linear coordinate are tested by returning to the origin P five times quickly from any point on the stroke 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 origin each time, see Figure 2. Each linear coordinate shall be tested at least in the middle of the stroke and at any three positions near the two ends, and the error shall be calculated as the maximum error at the three positions.
10.2 Error calculation method
The maximum value of 6 times the standard deviation of each linear coordinate during the origin return test is the origin return error. 10.3 Tolerance
The tolerance shall be in accordance with the design regulations of the manufacturer.
10.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 11 Machine tool accuracy inspection
11.1 The accuracy inspection of machine tools shall be in accordance with the provisions of JB/T8330.1. 337
JB/T 8330.2--96
11.2 The following items should be inspected when the machine tool spindle runs at medium speed and reaches a stable temperature: a.
G10 The radial runout of the axis of the spindle taper hole;
G13 The verticality of the spindle rotation axis of the vertical boring and milling head to the reference surface. 11.3 The cutting specifications for working accuracy shall be in accordance with the provisions of the design documents. The surface roughness of the test piece: the Ra value of the milling plane should not be greater than 3.2μm, the Ra value of the boring hole should not be greater than 2.5μm, and the Ra value of the wheel edge profiling should not be greater than 6.3μm.
Additional remarks:
This standard was proposed by the National Technical Committee for Metal Cutting Machine Tools Standardization. This standard is under the jurisdiction of the Beijing Milling Machine Research Institute. This standard was drafted by the Beijing No. 1 Machine Tool Plant. 3381 Test method
First, quickly move the moving parts on the linear coordinates to a certain distance in the positive (or negative) direction. After stopping, give several instructions of the minimum setting unit in the same direction, and then stop. Use this position as the reference position, give one instruction at a time, and give a total of 20 instructions of the minimum setting unit. Move in the same direction 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. 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. The stop positions of these instructions of the minimum setting unit in the positive and negative directions are not measured. Then, starting from the above-mentioned final position, give one instruction at a time, and give a total of 20 instructions of the minimum setting unit, continue to move in the negative (or positive) direction, and measure the stop position of each instruction, see Figure 1. The stop position of several minimum setting
unit instructions is not measured
actual moving distance
2888888
qqqqqq
qqqqqqqqqqqqqq
minimum setting unit
Each linear coordinate must be tested at least in the middle and two ends of the stroke. Calculate the error according to the provisions of Article 9.2, and take the maximum error value at the three positions as the error of this item. 9.2 Error calculation method
9.2.1 Minimum setting unit error Sa
S. l L;-m Imx
Where: L.
-actual displacement of a minimum setting unit instruction, mm; —-theoretical displacement of a minimum setting unit instruction, mm. Note: If the direction of the actual displacement is opposite to the given direction, the displacement should be a negative value. 9.2.2 Minimum setting unit relative error S
Where: L
The sum of the actual displacements of 20 minimum setting unit instructions, mm. 9.3 Tolerance
S.: According to the design regulations of the manufacturer;
Sb: shall not exceed 25%.
9.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 10 Origin return test
10.1 Test method
.....(1)
The moving parts on each linear coordinate are tested by returning to the origin P. at high speed 5 times from any point on the stroke in the same moving direction. The deviation X (i-1, 2, ., 5) between the actual position P and the theoretical position P. of the origin is measured each time, see Figure 2. Each linear coordinate shall be tested at least in the middle of the stroke and at any three positions near both ends, and the error shall be calculated as the maximum value of the errors at the three positions.
10.2 Error calculation method
For each linear coordinate, the maximum value of 6 times the standard deviation during the origin return test is the origin return error. 10.3 Tolerance
Tolerance shall be in accordance with the design regulations of the manufacturer.
10.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 11 Machine tool accuracy inspection
11.1 The accuracy inspection of machine tools shall be in accordance with the provisions of JB/T8330.1. 337
JB/T 8330.2--96
11.2 The following items should be inspected when the machine tool spindle runs at medium speed and reaches a stable temperature: a.
G10 The radial runout of the axis of the spindle taper hole;
G13 The verticality of the axis of the spindle rotation of the vertical boring and milling head to the reference surface. 11.3 The cutting specifications for working accuracy shall be in accordance with the provisions of the design documents. The surface roughness of the test piece: the Ra value of the milling plane should not be greater than 3.2μm, the Ra value of the boring hole should not be greater than 2.5μm, and the Ra value of the wheel edge profiling should not be greater than 6.3μm.
Additional remarks:
This standard was proposed by the National Technical Committee for Metal Cutting Machine Tools Standardization. This standard is under the jurisdiction of the Beijing Milling Machine Research Institute. This standard was drafted by the Beijing No. 1 Machine Tool Plant. 3381 Test method
First, quickly move the moving parts on the linear coordinates to a certain distance in the positive (or negative) direction. After stopping, give several instructions of the minimum setting unit in the same direction, and then stop. Use this position as the reference position, give one instruction at a time, and give a total of 20 instructions of the minimum setting unit. Move in the same direction 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. 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. The stop positions of these instructions of the minimum setting unit in the positive and negative directions are not measured. Then, starting from the above-mentioned final position, give one instruction at a time, and give a total of 20 instructions of the minimum setting unit, continue to move in the negative (or positive) direction, and measure the stop position of each instruction, see Figure 1. The stop position of several minimum setting
unit instructions is not measured
actual moving distance
2888888
qqqqqq
qqqqqqqqqqqqqq
minimum setting unit
Each linear coordinate must be tested at least in the middle and two ends of the stroke. Calculate the error according to the provisions of Article 9.2, and take the maximum error value at the three positions as the error of this item. 9.2 Error calculation method
9.2.1 Minimum setting unit error Sa
S. l L;-m Imx
Where: L.
-actual displacement of a minimum setting unit instruction, mm; —-theoretical displacement of a minimum setting unit instruction, mm. Note: If the direction of the actual displacement is opposite to the given direction, the displacement should be a negative value. 9.2.2 Minimum setting unit relative error S
Where: L
The sum of the actual displacements of 20 minimum setting unit instructions, mm. 9.3 Tolerance
S.: According to the design regulations of the manufacturer;
Sb: shall not exceed 25%.
9.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 10 Origin return test
10.1 Test method
.....(1)
The moving parts on each linear coordinate are tested by returning to the origin P. at high speed 5 times from any point on the stroke in the same moving direction. The deviation X (i-1, 2, ., 5) between the actual position P and the theoretical position P. of the origin is measured each time, see Figure 2. Each linear coordinate shall be tested at least in the middle of the stroke and at any three positions near both ends, and the error shall be calculated as the maximum value of the errors at the three positions.
10.2 Error calculation method
For each linear coordinate, the maximum value of 6 times the standard deviation during the origin return test is the origin return error. 10.3 Tolerance
Tolerance shall be in accordance with the design regulations of the manufacturer.
10.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 11 Machine tool accuracy inspection
11.1 The accuracy inspection of machine tools shall be in accordance with the provisions of JB/T8330.1. 337
JB/T 8330.2--96
11.2 The following items should be inspected when the machine tool spindle runs at medium speed and reaches a stable temperature: a.
G10 The radial runout of the axis of the spindle taper hole;
G13 The verticality of the axis of the spindle rotation of the vertical boring and milling head to the reference surface. 11.3 The cutting specifications for working accuracy shall be in accordance with the provisions of the design documents. The surface roughness of the test piece: the Ra value of the milling plane should not be greater than 3.2μm, the Ra value of the boring hole should not be greater than 2.5μm, and the Ra value of the wheel edge profiling should not be greater than 6.3μm.
Additional remarks:
This standard was proposed by the National Technical Committee for Metal Cutting Machine Tools Standardization. This standard is under the jurisdiction of the Beijing Milling Machine Research Institute. This standard was drafted by the Beijing No. 1 Machine Tool Plant. 338
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