JB/T 8490.2-1996 Technical requirements for CNC floor-standing milling and boring machines and floor-standing milling and boring machining centers
Some standard content:
JB/T8490.2—96
Based on the structural characteristics and use requirements of CNC floor-type milling and boring machines and floor-type milling and boring machining centers, this standard specifies and supplements the general technical standards of machine tools such as GB9061-88 "General Technical Conditions for Metal Cutting Machine Parts" and "General Technical Conditions for Metal Cutting Machine Tools", ZBnJ50008.1-88 "Metal Cutting Machine Tools" and ZBnJ50008.3-88 "General Technical Conditions for Assembly of Metal Cutting Machine Tools". For example, it specifies the specific varieties and quantities of machine tool accessories and tools; specifies the "important fixed joint surface" and "particularly important fixed joint surface"; and supplements the accuracy inspection items with "minimum setting unit test" and "origin return test". This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Wuhan Heavy Machine Tool Research Institute. Drafting units of this standard: Wuhan Heavy Machine Tool Factory, Qiqihar Second Machine Tool Factory, Wuchao Heavy Machine Tool Factory. 409
1 Scope
Machinery Industry Standard of the People's Republic of China
Technical Conditions for CNC Floor Milling Machines and Floor Milling and Boring Machining Centers
This standard specifies the requirements for the manufacture and acceptance of CNC floor milling and boring machines and floor milling and boring machining centers. JB/T8490.2—96
This standard applies to general-purpose CNC floor milling and boring machines and floor milling and boring machining centers with boring shaft diameters of 90 to 260 mm. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, 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. GB9061-88 General technical conditions for metal cutting machine tools GB10931--89 Method for evaluating the position accuracy of digitally controlled machine tools JB/T8490.1-96 Meter accuracy inspection for CNC floor-standing milling and boring machines and floor-standing milling and boring machining centers ZBJ50003-88 Determination of cleanliness of metal cutting machine tools ZBJ50004--88 Determination of sound pressure level of noise of metal cutting machine tools ZBnJ50008.1-88 General technical conditions for machining parts of metal cutting machine tools ZBmJ50008.2-88 General technical conditions for welded parts of metal cutting machine tools ZBnJ50008.3--88 General technical conditions for assembly of metal cutting machine tools ZB J50008.4--88 General technical conditions for assembly of metal cutting machine tools ZB J50008.5--88 General technical conditions for assembly of metal cutting machine tools ZB J50008.6--88 General technical conditions for assembly of metal cutting machine tools ZB J50008.7--88 General technical conditions for assembly of metal cutting machine tools ZB J50008.8--88 General technical conditions for assembly of metal cutting machine tools ZB J50008.9--88 General technical conditions for assembly of metal cutting machine tools ZB J50008.1-88 General technical conditions for machining parts of metal cutting machine tools ZB J50008.2-88 General technical conditions for welding parts of metal cutting machine tools ZB J50008.3--88 General technical conditions for assembly of metal cutting machine tools ZB J50008.8 ... 010-—89
3 General requirements
Inspection and evaluation of the color coating method for the joint surface of metal cutting machine tools When accepting machine tools according to this standard, the remaining acceptance items in GB9061, ZBnJ50008.1, ZBnJ50008.3 and other standards that are not specified in this standard must be inspected at the same time. 4 Accessories and tools
4.1 The following accessories and tools should be supplied randomly: a) Special wrenches for installing machine tools, one set; b) Special tools for loading and unloading tools, one set; c) Other special-purpose tools and special wrenches, one set; d) Adjustment shims, anchor screws, nuts, washers, several sets. 4.2 The following special accessories can be supplied according to the agreement: a) flat turntable;
b) vertical milling head;
c) universal milling head;
d) fixed platform
e) heavy-duty rotary table or CNC heavy-duty rotary table; approved by the Ministry of Machinery Industry of the People's Republic of China on November 7, 1996410
implemented on January 1, 1997
JB/T 8490.2-96
f) various cutting tools, tool bars, tool handles, pull nails and tool setting instruments and other special accessories and other peripheral equipment to expand the usability of machine tools. 5 Safety and Health
5.1 The guide surfaces of the bed and column should be equipped with protective devices. 5.2 The ball screw pair should be equipped with protective devices.
5.3 The linear motion parts should be equipped with limit devices. 5.4 For the influence of thermal deformation caused by non-thermal symmetry of the columns of large-sized machine tools, corresponding measures should be taken to prevent thermal deformation. 5.5 The noise of machine tools shall be inspected according to the provisions of ZBJ50004. The machine tools shall meet the normal installation and use conditions, and the sound pressure level of the whole machine shall not exceed 85 dB(A).
6 Processing and assembly quality
6.1 The spindle box, ram, tail box, etc. are important castings and should be aged after rough processing. If the above parts are welded parts, they should comply with the provisions of ZBnJ50008.2. NDT inspection should be carried out and there should be no cracks. 6.2 For the main parts that are easy to wear, such as boring shaft pairs, ball screw pairs, worm gear pairs, and main drive gears, wear-resistant measures corresponding to the life should be taken. 6.3 The guide pair of the slide and bed, the guide pair of the spindle box and the column or the guide pair of the slide saddle and the column, the guide pair of the slide ram and the spindle box or the guide pair of the slide saddle and the spindle box are important guide pairs, and wear-resistant measures suitable for the life of the guides should be taken. 6.4 The following joint surfaces should be assessed according to the requirements of "important fixed joint surfaces": a) The joint surface of the bed and the bed,
b) The joint surface of the slide and the column;
c) The joint surface of the tail box and the spindle box;
d) The joint surface of the rack and the bed;
e) The joint surface of the inlaid guide rail;
f) The joint surface of the tool magazine bracket and the column.
6.5 The following joint surfaces should be assessed according to the requirements of "particularly important fixed joint surfaces": a) The fixed joint surface of the ball screw support; b) The fixed joint surface of the nut seat.
6.6 The following guide pairs shall be assessed according to the requirements of "static pressure, sliding (rolling) guides": a) slide and bed guide pair;
b) spindle box and column guide pair or saddle and column guide pair; c) ram and spindle box guide pair or saddle and spindle box guide pair. 6.7 Cleanliness shall be inspected according to the provisions of ZBJ50003. 6.7.1 The internal cleanliness of the spindle box shall be sampled and inspected by weight method, and the content of impurities and dirt shall not exceed 400mg/L (spot check). 6.7.2 The cleanliness of the hydraulic system oil shall be sampled and inspected by weight method, and the content of impurities and dirt shall not exceed 200mg/L (spot check). 6.7.3 Other parts shall be inspected by visual inspection and touch method, and there shall be no dirt. 6.8 The following important locating pins shall be inspected by color coating, and their contact length shall not be less than 60% of the working length, and shall be evenly distributed on both sides of the joint:
a) locating pins for the joint surface of the bed and the bed; b) locating pins for the joint surface of the column and the slide. 6.9 The steel guide rail shall be inspected by flaw detection and shall not have cracks. 7 Machine tool idle operation test
7.1 The main motion mechanism of the machine tool shall start from the lowest speed and operate in sequence. The operation time of each speed level shall not be less than 2 minutes. The high speed operation time shall not be less than 1 hour to make the spindle bearing reach a stable temperature. The temperature and temperature rise of the bearing shall be measured near the spindle bearing or at the specified position of the design. The temperature shall not exceed 70℃ and the temperature rise shall not exceed 40℃. 7.2 Use buttons and switches for manual operation to test the flexibility, stability and reliability of the machine tool movement. 7.2.1 The main motion mechanism and the feed motion mechanism shall be tested for starting and stopping (including braking, reversing, jogging, etc.) at medium speed, and the continuous operation shall not be less than 5 times.
7.2.2 The main motion mechanism and the feed motion mechanism shall be tested for speed change at low, medium and high speeds (step-change speed for each level), and the operation time of each level shall not be less than 2 minutes.
7.2.3 The fast moving mechanism shall be tested for fast moving, and the number of reciprocating tests shall not be less than 3 times, and its stroke shall not be less than half of the full stroke. 7.2.4 The tool magazine and the manipulator shall be tested for tool change in an optional manner. The tool configuration on the tool magazine shall include tools with the maximum weight, maximum length and maximum diameter specified in the design. The tool change action shall be flexible, reliable and accurate, and the load-bearing weight and tool change time of the manipulator shall comply with the design requirements.
7.2.5 The hydraulic, lubrication and cooling systems shall be tested for sealing, lubrication and cooling performance, requiring easy adjustment, flexible action, good lubrication, sufficient cooling, and no leakage in each system.
7.2.6 Test the reliability of various indicator lights, readers, ventilation systems and other functions of the digital control device. 7.2.7 Test the reliability of the functional operation of the safety, insurance and protective devices of the machine tool. 7.3 Use digital control instructions to make various parts of the machine tool move, and test the flexibility of its movement and the reliability of the digital control function. 7.3.1 Carry out the test in accordance with the provisions of 7.2.1 to 7.2.3. 7.3.2 For each tool in the total capacity of the tool magazine, including the tool with the largest weight, the automatic tool change test shall be carried out in an optional manner for no less than 2 times. The tool with the largest weight shall also be carried out at each tool position, and the action shall be flexible and reliable. 7.3.3 Test the reliability and flexibility of the coordinate linkage, positioning, linear interpolation, circular interpolation, tool position compensation, clearance compensation and other functions of the machine tool.
7.4 The idling power of the main transmission system shall be assessed according to the design requirements. 7.5 Use the CNC program to carry out a continuous idling test of the whole machine under all functions. 7.5.1 The continuous operation time of the whole machine shall not be less than 16 hours for CNC floor-type milling and boring machines, and not less than 32 hours for floor-type milling and boring machining centers. 7.5.2 During the entire process of continuous idle operation, the machine tool should operate normally, smoothly, reliably, and no failure should occur, otherwise it must be restarted.
7.5.3 The continuous idle operation program should include the following contents: a) The boring axis includes positive and reverse rotation at low, medium and high speeds, and the high-speed rotation time is generally not less than 10% of the time used for each cycle program;
b) The moving parts on each coordinate should include low, medium and high feed speeds and fast positive and negative operations. The operation should be within a range close to the full stroke, and any point can be selected for positioning. High-speed feed speed and fast running time are generally not less than 10% of the time used for each cycle program;
c) Automatic exchange of tools at each tool position in the tool magazine for not less than 2 times; d) Automatic indexing and positioning of the CNC rotary table; e) Linkage of each linkage coordinate;
f) Other various CNC functions of the machine tool g) The pause time between each cycle program shall not exceed 1 min. 8 Machine tool load test
This series of machine tools should be subjected to the following load tests: a) Test of the maximum torque of the machine tool main transmission system; b) Test of the maximum cutting resistance of the machine tool;
c) Test of the maximum power of the machine tool main transmission system. The test of the maximum torque, maximum cutting resistance and maximum power of the machine tool main transmission system shall be carried out according to the design documents.
Maximum power refers to the design power.
9 Precision inspection of machine tools
9.1 Geometric precision and working precision
JB/T 8490.2—96
9.1.1 The precision inspection of machine tools shall be carried out in accordance with JB/T8490.1. 9.1,2 The five items G5, G6.G7, G11, and G12 in the precision standard shall be inspected when the machine tool spindle reaches the medium speed stable temperature. 9.1.3 The test specifications for working precision inspection shall be in accordance with the design documents. 9.1.4 The surface roughness R of the test piece during the working precision inspection shall meet the following requirements: a) Milling plane or outer circle, 3.2μm;
b) Boring, 1.6μm.
9.2 Minimum setting unit test
9.2.1 Linear coordinate minimum setting unit test 9.2.1.1 Test method
First, quickly move the moving part on the linear coordinate in the positive (or negative) direction for a certain distance. After stopping, give several minimum setting unit instructions in the same direction, and then stop again. Use this position as the reference position and give one at a time, for a total of 20 minimum setting unit instructions, move in the same direction, and measure the stopping 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, and continue to move in the negative (or positive) direction. Measure the stop position of each instruction, see Figure 1. 188800808888988
The stop position of several instructions of the small setting unit
is not measured
. Actual moving distance highWww.bzxZ.net
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minimum setting unit
Each linear coordinate must be tested at least at the middle and two ends of the stroke. Calculate the error according to the provisions of 9.2.1.2, and take the maximum error value at the three positions as the error of this item. 9.2.1.2 Error calculation method
a) Minimum setting unit error S.
S. = [L; -m Imax
Where; L).
Actual displacement of a 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. (1)
JB/T 8490.2--96
Theoretical displacement of a minimum setting unit instruction, mm. b) Minimum setting unit relative error S
9.2.1.3 Tolerance
-The sum of the actual displacements of 20 minimum setting unit instructions, mm. S.: According to the design regulations of the manufacturer;
Sh: should not exceed 25%.
9.2.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 9.3 Origin return test
9.3.1 Origin return test for linear coordinates
9.3.1.1 Test method
....................(2)
The moving parts on each linear coordinate are tested to return to the origin P. at high speed five 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. Po
Each linear coordinate is tested at least at the middle of the stroke and at any three positions near the two ends. The error is calculated as the maximum error at the three positions.
9.3.1.2 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. 9.3.1.3 Tolerance
The tolerance shall be in accordance with the design requirements of the manufacturer.
9.3.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire ruler. 414Actual moving distance height
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minimum setting unit
Each linear coordinate must be tested at least at the middle and two ends of the stroke. Calculate the error according to the provisions of 9.2.1.2, and take the maximum error value at the three positions as the error of this item. 9.2.1.2 Error calculation method
a) Minimum setting unit error S.
S. =[L;一m Imax
Where; L).
Actual displacement of a 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. (1)
JB/T 8490.2-—96
Theoretical displacement of a minimum setting unit instruction, mm. b) Relative error of the minimum setting unit S
9.2.1.3 Tolerance
-The sum of the actual displacements of 20 minimum setting unit instructions, mm. S.: According to the design regulations of the manufacturer;
Sh: should not exceed 25%.
9.2.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 9.3 Origin return test
9.3.1 Linear coordinate origin return test
9.3.1.1 Test method
....................(2)
The moving parts on each linear coordinate are tested by returning to the origin P. at high speed for 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. Po
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 value of the errors at the three positions.
9.3.1.2 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. 9.3.1.3 Tolerance
Tolerance shall be in accordance with the design regulations of the manufacturer.
9.3.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 414Actual moving distance height
qqqqqqqqo
qq@double
minimum setting unit
Each linear coordinate must be tested at least at the middle and two ends of the stroke. Calculate the error according to the provisions of 9.2.1.2, and take the maximum error value at the three positions as the error of this item. 9.2.1.2 Error calculation method
a) Minimum setting unit error S.
S. =[L;一m Imax
Where; L).
Actual displacement of a 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. (1)
JB/T 8490.2-—96
Theoretical displacement of a minimum setting unit instruction, mm. b) Relative error of the minimum setting unit S
9.2.1.3 Tolerance
-The sum of the actual displacements of 20 minimum setting unit instructions, mm. S.: According to the design regulations of the manufacturer;
Sh: should not exceed 25%.
9.2.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 9.3 Origin return test
9.3.1 Linear coordinate origin return test
9.3.1.1 Test method
....................(2)
The moving parts on each linear coordinate are tested by returning to the origin P. at high speed for 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. Po
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 value of the errors at the three positions.
9.3.1.2 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. 9.3.1.3 Tolerance
Tolerance shall be in accordance with the design regulations of the manufacturer.
9.3.1.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 414
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