JB/T 8599.2-1997 Technical requirements for CNC copying bed milling machines
Some standard content:
JB/T8599.2-1997
Based on the structural characteristics and use requirements of CNC copy bed milling machines, this standard specifies and supplements the general technical standards of machine tools such as GB9061-88 "General Technical Conditions for Metal Cutting Machine Tools", ZBnJ50008.1-88 "General Technical Conditions for Mechanical Processing Parts of Metal Cutting Machine Tools", and ZBnJ50008.3--88 "General Technical Conditions for Assembly of Jinteng Cutting Machine Tools". This standard was proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Beijing Milling Machine Research Institute. The drafting units of this standard are: Changzheng Machine Tool Co., Ltd., Beijing No. 1 Machine Tool Factory, Qiqihar No. 2 Machine Tool Factory, Qinghai No. 1 Machine Tool Factory, Nantong Machine Tool Co., Ltd., Shanghai No. 4 Machine Tool Factory, Shanghai Shenjiang Machinery Factory, Jiangdong Machine Tool Factory, and Guilin Machine Tool Co., Ltd. 438
1 Scope
Machinery Industry Standard of the People's Republic of China
CNC Copy Bed Milling Machine
Technical Conditions
This standard specifies the requirements for the manufacture and acceptance of CNC copy bed milling machines, JB/T8599.2—1997
This standard is applicable to CNC copy bed milling machines with a worktable width of 320 to 1250 mm for general use. 2 Referenced Standards
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 will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB9061—88 General technical conditions for metal cutting machine tools JB/T8599.1--1997 Accuracy inspection of CNC copy bed milling machines ZBJ50003-88 Determination of cleanliness of metal cutting machine tools ZBnJ50008.1-88 General technical conditions for mechanical parts of metal cutting machine tools ZBnJ50008.3--88 General technical conditions for assembly of metal cutting machine tools 3—General requirements
When accepting machine tools according to this standard, the remaining acceptance items in GB9061, ZBnJ50008.1, ZBnJ50008.3 and other standards that have not been concretized in this standard must be inspected at the same time. Accessories and tools
The following accessories and tools are supplied randomly:
a) Milling cutter bar: 1 set;Www.bzxZ.net
b) Pull nail for 7:24 taper shank: 1 piece;
c) Profiling finger: 1 piece;
d) Anchor screw, washer: 1 set;
c) Special adjustment tool: 1 set.
4.2 The following special accessories can be supplied according to the agreement:a) Special cutting tools,
b) Tool setting instrument;
c) Various profiling fingers;
d) Peripheral equipment of control system;
e) Others.
5 Processing and assembly quality
5.1 The bed, worktable, column, spindle box, saddle, slide seat and ram of column or spindle box are important castings (welded parts) and should be aged after rough processing.
Approved by the Ministry of Machinery Industry of the People's Republic of China on August 18, 1997, implemented on January 1, 1998
JB/T 8599.2--1997
5.2 For the easily worn parts of machine tool spindles, spindle sleeves, lead screw pairs and high-speed, heavy-loaded gears, etc., wear-resistant measures corresponding to the service life should be adopted.
5.3 The following guide pairs are important guide pairs and should adopt wear-resistant cast iron, steel inlay, plastic coating or high (medium) frequency induction quenching and other wear-resistant measures. a) worktable and saddle guide pair;
b) saddle and bed guide pair;
c) column (or column slide) and bed guide pair; d) ram and vertical slide guide pair;
e) vertical slide and column guide pair;
) worktable and bed guide pair;
g) spindle box and column guide pair.
5.4 The joint surface of the sliding guide plate and the joint surface of the profiling bracket and the spindle box shall be assessed according to the requirements of "important fixed joint surface". 5.5 The following joint surfaces shall be assessed according to the requirements of “particularly important fixed joint surfaces”: a) the joint surface of the screw bracket;
b) the joint surface of the nut seat;
c) the joint surface of the column and the bed;
d) the joint surface of the front and rear bed;
c) the joint surface of the column and the column slide;
f) the joint surface of the spindle box and the spindle box slide. 5.6 The following guide rails shall be assessed according to the requirements of "sliding (rolling) guide rails": a) bed guide rails;
b) column guide rails;
c) workbench guide rails;
d) ram guide rails.
5.7 The guide rails of the profiling bracket shall be assessed according to the requirements of "displacement guide rails". 5.8 The high-speed rotating spindle assembly shall be subjected to a dynamic balance test. 5.9 The plastic-coated and coated guide rails shall fit tightly with the substrate, be firmly and reliably bonded, and should not have gaps and bubbles. The contact with the matching guide rails shall be uniform and shall comply with the relevant Regulations.
5.10 The steel guide rails shall be inspected for flaws after quenching. No cracks are allowed. 5.11 The cleanliness of the machine tool shall be inspected in accordance with the provisions of ZBJ50003. When inspected by weight, the impurities and dirt shall not exceed the following regulations. Spindle box, feed box: 400mg/L, lubrication system: 300mg/L, hydraulic transmission system: 100mg/L. 5.12 The following locating pins shall be assessed in accordance with the requirements of "important locating pins": a) locating pins between the column and the bed;
b) locating pins of the front and rear bed.
5.13 The disc springs used in the broaching mechanism and other important mechanisms shall be subjected to working pressure tests after assembly and shall comply with the requirements of relevant standards or technical documents.
6 Dry running test of machine tool
6.1 Dry running test of main motion mechanism
The main motion mechanism of the machine tool is tested for dry running in sequence from the lowest to the highest speed (the stepless speed change should have no less than 10 speeds). The running time of each level shall not be less than 2min, and the running time of the highest speed shall not be less than 1h, so that the spindle bearing reaches a stable temperature, and the temperature and temperature rise are measured near the spindle bearing. The temperature shall not exceed 65℃, and the temperature rise shall not exceed 35℃. When running at each speed, the operation shall be smooth, and the working mechanism shall be normal and reliable.
6.2 Dry running test of feed motion mechanism
JB/T 8599.2-1997
Use low, medium, high feed speeds and fast feed speeds to test the moving parts on the linear motion axis for dry running. The operation shall be smooth, and the working mechanism shall be normal and reliable without vibration.
6.3 Inspection of main motion and feed motion speed Under the condition of no-load operation, check the correctness of the spindle speed. For the spindle speed of step transmission, its actual deviation should not exceed -2% to +6% of the indicated value. The actual deviation of the spindle speed and feed speed of stepless speed change shall be assessed according to the requirements specified in the design. 6.4 Action test
6.4.1 Manual action test
6.4.1.1 Use medium speed to continuously start and stop the main motion mechanism for 10 times in the forward and reverse directions respectively. The action should be flexible and reliable.
6.4.1.2 Perform the main motion speed change test step by step (at least low, medium and high speeds for stepless speed change). The operating mechanism should be flexible and reliable.
6.4.1.3 Use medium feed speed to continuously start and stop the moving parts on the linear and rotary coordinates for 10 times in the forward and reverse directions respectively. The action should be flexible and reliable. 6.4.1.4 Test the speed change operation of the feed motion mechanism using 10 feed speeds including low, medium, high and fast. The action should be flexible and reliable.
6.4.1.5 Test the various indicator lights, control buttons and fans of the numerical control device. The action should be reliable. 6. 4. 1. 6
Test the hydraulic, cooling and lubrication systems of the machine tool. The operation should be reliable. 6. 4. 1.7
Test the automatic broaching mechanism of the machine tool. The action should be reliable. 6. 4. 1. 8
Test the safety, insurance and protection devices of the machine tool. The functions should be reliable and the actions should be flexible and accurate. 6.4.1.9 Test other auxiliary devices of the machine tool. The functions should be reliable. 6.4.2 Automatic action test (can be combined with 6.6 machine continuous idle running test) 6.4.2.1
Use medium speed to carry out forward and reverse continuous start and stop operation test on the main motion mechanism. The action should be flexible and reliable. 6. 4. 2.2
Carry out the main motion speed change test step by step (at least low, medium and high speeds for stepless speed change). The action should be flexible and reliable. 6.4.2.3 Use medium feed speed to carry out forward and reverse continuous start and stop action test on the moving parts on the linear and rotary coordinates. The action should be flexible and reliable.
6.4.2.4 Use feed speeds including low, medium, high and fast to test the feed mechanism. The action should be flexible and reliable. 6.4.2.5 Test the CNC functions of the machine tool, such as coordinate linkage, positioning, linear interpolation, circular interpolation, tool radius compensation, etc. Each function should be reliable and the action should be flexible.
6.4.2.6 The feed mechanism should be tested item by item at low, medium and high profiling feed speeds according to the various profiling functions of the machine tool. It should work normally, have reliable performance, run smoothly, and the profiling finger should not leave the mold, without obvious creeping, jamming and shaking. 6.4.2.7 For machine tools with digital profiling functions, the profiling finger (or scanner) should be used to scan the trajectory of the model, and the CNC program should be converted for operation test. Its function should be reliable and the trajectory should be correct. 6.4.2.8 Conduct online tests on special accessories of the machine tool. The action should be reliable. 6.5 Idle power test
The idle power of the main transmission system of the machine tool (excluding the no-load power of the main motor) shall not exceed the provisions of Table 1. Table 1
Rated power of the main motor
6.6 Continuous idle test of the whole machine
Main motion speed change form
Mechanical speed change
Motor speed regulation
Mechanical speed change
Motor speed regulation
Idle power/rated power of the main motor
JB/T 8599.2—1997
6.6.1 The continuous idle test shall be carried out after the tests (or inspections) specified in 6.1 to 6.4 and before the accuracy inspection. 6.6.2 The continuous idle test of the whole machine shall be carried out under all functions. The continuous idle test shall not be less than 16 hours without failure. At least two operation programs shall be tested. The profiling function can be programmed and run separately, and the running time shall not be less than 4 hours. The operation shall be stable and reliable. 6.6.3 The continuous idle operation test procedure shall meet the following conditions: a) The spindle shall perform positive and reverse movements and speed changes including low, medium and high speeds, and the time of high-speed operation shall not be less than 10% of a program cycle time; b) The moving parts on the linear motion axis shall perform positive and negative movement tests including low, medium, high feed speeds and fast speeds and change the movement speed. When moving at feed speed, its stroke shall be close to the full stroke, and any point can be selected for positioning; when moving at fast speed, its stroke shall not be less than 1/3 of the full stroke; the time of high feed speed and fast movement shall not be less than 10% of the program cycle time: each operation shall be evenly distributed in the entire program; c) The linkage of each linkage coordinate; d) Various CNC, profiling and digital functions of the machine tool; e) The rest time between two cycles shall not exceed 1min. 7 Machine tool load test
7.1 This 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; c) Test of the machine tool main transmission system reaching the maximum power (spot check). 7.2 Operation test of the machine tool bearing the maximum weight of the workpiece 7.2.1 Place a weight equivalent to the maximum weight of the workpiece specified in the design on the worktable to make its load uniform. 7.2.2 Operate the worktable at the lowest and highest feed speeds and at high speed respectively. When operating at the lowest feed speed, it is generally carried out at two and three places in the middle of the stroke, and the moving distance of the worktable at each place should not be less than 20mml. When operating at the highest feed speed and high speed, it should be carried out on the full stroke of the worktable, reciprocating once and five times respectively, and the operation should be stable and reliable. When operating at a low feed speed, the worktable should not have obvious creeping phenomenon.
7.3 Test of the maximum torque of the main transmission system
7.3.1 In the constant torque speed regulation range of the main transmission system, select an appropriate spindle speed, use milling to test, and adjust the cutting amount so that the main transmission system reaches the maximum torque specified in the design! 7.3.2 The material of the test piece is HT200 or 45 steel: the cutting tool is a insert end milling cutter. 7.3.3 During the test, the transmission components and speed change mechanism of the machine tool transmission system should work reliably and run smoothly. 7.4 Test of the main transmission system reaching maximum power7.4.1 In the constant power speed regulation range of the main transmission system, select an appropriate spindle speed, and use milling to test. Adjust the cutting amount so that the power of the main transmission system reaches the rated power of the main motor or the maximum power specified in the design7.4.2 The material of the test piece is 45 steel: the cutting tool is an insert end milling cutter. 7.4.3 During the test, the machine tool should have no obvious chatter. All parts should work normally, the electrical system should be reliable, and the metal removal rate should be recorded. 8 Minimum setting unit test for linear motion axis 8.1 Test method
See Figure 1. First, quickly move the moving part on the linear motion axis in the positive (or negative) direction for a certain distance and then stop. Then, give several minimum setting unit instructions in the same direction to make the moving part stop at a certain position, which is used as the reference position. Then, give one minimum setting unit instruction at a time in the same direction, for a total of 20 minimum setting unit instructions, to make the moving part move and stop continuously, and measure its stopping position under each instruction. From the above-mentioned final measurement position, continue to give instructions of several minimum setting units in the same direction to make the moving part move and stop, and then give instructions of several minimum setting units in the negative (or positive) direction to make the moving part return to the above-mentioned final measurement position approximately. The stop position of the moving part under these instructions of several minimum setting units in the positive 442
JB/T8599.2—1997
and negative directions is not measured, and then continue to give instructions of one minimum setting unit each time in the negative (or positive) direction, a total of 20 minimum setting units, continue to make the moving part move continuously, stop, return to the reference position approximately, and measure its stop position under each instruction.
Note: Sometimes the actual moving direction is not consistent with the instruction direction, and each linear motion axis must be tested at least in the middle of the stroke and near the two ends.
Under these minimum setting unit instructions
The stop position of the component is not measured
Measurement range
8.2 Error calculation method
8.2.1 Minimum setting unit error
Actual moving distance
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Minimum setting unit
The minimum setting unit error is calculated by the maximum absolute value of the difference between the actual displacement value and the theoretical value of a minimum setting unit instruction in each position test on each linear motion axis, as shown in formula (1): S, =l L,—mImax
Where: S. Minimum setting unit error, mm; Li
Actual displacement value of a minimum setting unit instruction, mm (i-1, 2.3*.20); Theoretical value of a minimum setting unit instruction, mm. Note: If the direction of the actual displacement is opposite to the direction of the instruction, the displacement should be a negative value. 8.2.2 Relative error of minimum setting unit
The relative error of minimum setting unit is calculated as the percentage of the absolute value of the difference between the maximum value of the sum of the actual displacement values of 20 consecutive minimum setting unit instructions and the theoretical value of 20 minimum setting unit instructions in the test of each position on each linear motion axis to the theoretical value of 20 minimum setting unit instructions, as shown in formula (2): 20m
Where: Sh
Relative error of minimum setting unit;
The sum of the actual displacement values of 20 consecutive minimum setting unit instructions, mm (i=1, 2, 3.*20). 8.2.3
It shall be specified by the enterprise standard of the manufacturer. It is recommended that S is not greater than five minimum setting units; Sb should not be greater than 25%. · (2)
8.2.4Test tools
JB/T 8599.2-1997
Laser interferometer or reading microscope and metal wire scale. 9: Origin return test of linear motion axis
9.1 Test method See Figure 2. Make the moving parts on each linear motion axis return to a set origin P five times quickly from the same direction. Test and measure the difference between the actual return position P of the moving parts and the theoretical position of the origin each time, that is, the origin return deviation X,o(i-1.2.35).
Each linear motion axis must be tested at least in the middle of the stroke and at three positions near both ends. 8
9.2 Error calculation method
The origin return error is calculated as six times the maximum standard deviation of the origin return deviation calculated in at least three position tests on each linear motion axis, as shown in formula (3): R. 6 Somax
Where: Ro
Origin return error, mm;
Standard deviation of origin return deviation, mm. S.
Origin return deviation XuP-P.
The average deviation of the origin return deviation is again.
9.3 Tolerance
(XX.)\
It is specified by the enterprise standard of the manufacturer (R is recommended, not more than 1/2 of the repeat positioning accuracy). 9.4 Test tools
Laser interferometer or reading microscope and metal wire scale. 444
10 Machine tool accuracy inspection
JB/T8599.2-1997
Accuracy inspection shall be carried out in accordance with the provisions of JB/T8599.1. 10.1
10.2 The following items shall be inspected when the machine tool spindle runs at medium speed and reaches a stable temperature: a) Radial runout of the G6 spindle taper hole axis; b) Verticality of the G7 spindle rotation axis to the worktable. 10.3 The position accuracy of the machine tool shall be carried out after the load test and before the working accuracy inspection. 10.4 Cutting specification for working accuracy According to the design documents, the maximum allowable value of the roughness Ra of the milled surface of the test piece is 3.2μm, and the maximum allowable value of the wheel profiling R is 6.3μm. Working accuracy should be inspected and qualified in one delivery. Random technical documents
The machine tool manual should be supplied in two copies. 11.1
11.2 The machine tool qualification certificate should be accompanied by a chart showing the inspection of the relevant position accuracy items. 445
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