JB/T 8649.2-1997 JB/T 8649.2-1997 Technical requirements for CNC printed circuit board drilling machines JB/T8649.2-1997 Standard download decompression password: www.bzxz.net

JB/T8649.2—1997
This standard is a specific and supplementary standard of GB9061—88, ZBnJ50008.1—88, ZBnJ50008.2—88, ZBnJ50008.3—88, etc.
This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Shenyang Boring and Drilling Machine Research Institute. The drafting units of this standard are: Nanjing University of Aeronautics and Astronautics Electromechanical Equipment Factory, Chongqing University Electromechanical Equipment Factory, Hangzhou West Lake Drilling Factory, and Fuzhou Drilling Factory.
1 Scope
Mechanical Industry Standards of the People's Republic of China
CNC Printed Circuit Board Drilling Machine
Technical Conditions
This standard specifies the requirements for the manufacture and acceptance of CNC printed circuit board drilling machines. This standard applies to CNC printed circuit board drilling machines. 2 Cited Standards
JB/T 8649.2-1997
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 the parties using this standard should explore the possibility of using the latest versions of the following standards. GB4588.1--87 Technical conditions for printed circuit boards
GB9061-88 General technical conditions for metal cutting machine tools GB10931-89 Method for evaluating the position accuracy of digitally controlled machine tools ZB J50 003-88
3 Determination of the cleanliness of metal cutting machine tools
ZBJ50006--89 Method for compiling random technical documents for metal cutting machine tools General technical conditions for machined parts of metal cutting machine tools ZBn J50 008. 1-88
ZBn J50 008. 2-88
General technical conditions for welded parts of metal cutting machine tools ZBn J50 008. 3-—88
General Technical Conditions for Assembly of Metal Cutting Machine Tools JB/T8649.1—1997
Precision Inspection of CNC Printed Circuit Board Drilling Machines
3 General Requirements
When accepting machine tools according to this standard, the remaining acceptance items in GB9061, ZBnJ50008.1, ZBnJ50008.2, ZBnJ50008.3 and other standards that are not specified in this standard must also be accepted. 4 Accessories and Tools
Common tools such as loading and unloading, operation, and adjustment should be supplied randomly to ensure normal use and maintenance by users. The types, specifications, and quantities of tools should be determined according to the specific regulations of the manufacturer.
5 Processing and assembly quality
5.1 The following castings and weldments are important castings and weldments and should be aged after rough processing: a) bed;
b) column;
c) workbench;bZxz.net
d) saddle (beam);
e) slide plate.
5.2 The following joint surfaces should be assessed according to the requirements of "important fixed joint surfaces": a) joint surface between column and bed;
Approved by the Ministry of Machinery Industry of the People's Republic of China on August 18, 1997 482
Implemented on January 1, 1998
b) joint surface between slide plate and saddle (beam). JB/T 8649.2—1997
5.3 The following joint surfaces shall be assessed in accordance with the requirements of “particularly important fixed joint surfaces”: a) the joint surface between the rolling linear guide support and the mating part; b) the joint surface between the rolling linear guide bearing seat and the worktable; c) the joint surface between the ball screw nut seat and the worktable; d) the joint surface between the ball screw support seat and the mating part. 5.4 The ball screw pair installed on each coordinate axis shall be operated multiple times after assembly, and its reverse clearance shall not exceed 0.02mm. 5.5 Welded parts and welded components must comply with the provisions of ZBnJ50008.2. 5.6 Check that all machine tool components comply with 3.2 of ZBJ50003—88. Regulations. 6 Machine tool idle running test
6.1 Machine tool idle running test
6.1.1 The main motion mechanism of the machine tool is operated in sequence from low speed. The operation time of each level shall not be less than 2 minutes, and the highest speed operation time shall not be less than 1 hour. The spindle bearings of the machine tool reach a stable temperature. The temperature and temperature rise of the bearings are measured near the spindle bearings. The temperature shall not exceed 65°C, and the temperature rise shall not exceed 35°C.
6.1.2 The actual deviation of the spindle speed shall not exceed -2% to +6% of the value indicated on the nameplate (excluding the main motor speed error). 6.1.3 For the moving parts of the machine tool linear coordinates, perform forward and reverse rotation at low, medium and high speeds respectively.
6.1.4 Start and stop the spindle 10 times at medium speed. The action should be smooth and reliable. 6.2 Function test of machine tool
6.2.1 Manual function test
6.2.1.1 When the spindle is at medium speed, start and stop the test 10 times continuously. The action should be sensitive and reliable. 6.2.1.2 The spindle is tested for speed change from low speed to speed change. The action should be flexible and reliable. 6.2.1.3 Test the drilling function of the spindle. The action should be flexible and reliable. 6.2.1.4 Test the moving parts of each linear coordinate at medium speed continuously. Continue to carry out 10 positive and negative start and stop tests, and select appropriate increments for positive and negative operation tests. The action should be smooth and reliable. 6.2.1.5 Test the various indicator lights, control buttons, tape drives and fans of the machine tool. The functions should be accurate and reliable. 6.2.1.6 Test the various auxiliary devices of the machine tool. The operation should be smooth and reliable. 6.2.2 Automatic function test (can be combined with 6.3 "continuous idle operation test") The automatic function test is a test conducted by operating various parts of the machine tool using the CNC program. 6.2.2.1 Test the CNC functions of the machine tool such as coordinate linkage, positioning, and origin return one by one. The functions are reliable. 6.3 Continuous idle operation test of the machine tool
The continuous idle operation test is a non-cutting continuous idle operation test conducted after 6.1-6.2 and before the accuracy inspection, using the CNC program including various processing functions of the machine tool to operate various parts of the machine tool. 6.3.1 The continuous idle operation test time of the whole machine is 16h. 6.3.2 During the whole process of continuous idle operation, the machine tool should operate normally, smoothly and reliably, and no failure should occur. Otherwise, the test must be repeated.
6.3.3 The continuous idle operation program should include the following contents: a) The moving parts on each coordinate should include low, medium and high feed speeds and fast forward and reverse operation. After operation, they should be within the range close to the full stroke, and any point can be selected for positioning. The use of the override switch is not allowed during operation. The high feed speed and fast operation time should not be less than 10% of the time used for each cycle program;
b) The linkage of each linkage coordinate;
c) The basic functions and selected CNC functions of the machine tool; 483
JB/T8649.2-—1997
d) The pause time between each cycle program shall not exceed 0.5min. 7 Load test of machine tools
7.1 The machine tool should be subjected to the maximum drilling test allowed by the design. 7.2 The test conditions and cutting amount of the maximum drilling test shall be specially stipulated by the design department according to the specific conditions of the product. For machine tools that are mass-produced and have stable quality, random inspections are allowed for load tests. 8 Working test of machine tools
8.1 The machine tool shall be subjected to the drilling test of the minimum hole diameter specified in the design, and the number of processed holes shall be no less than 300. 8.2 The machine tool shall be subjected to the processing test of 2000 holes, and the machine tool shall not fail. 8.3 The test conditions and cutting amount of the above tests shall be specially stipulated by the design department according to the specific conditions of the product. 9 Test of the minimum setting unit of the heavy line coordinate
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. This position is used as the reference position. Give a minimum setting unit instruction each time, move in the same direction, and move 20 units continuously. Measure the stop position of each instruction. From the above-mentioned final measurement 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 to make it return to the above-mentioned final measurement position. These several minimum setting unit instructions are not measured. Then, starting from the above-mentioned final measurement position, give a minimum setting unit instruction each time, continue to move in the negative (or positive) direction, make it return to the reference position, and measure the stop position of each instruction (see Figure 1). Note, pay attention to the actual direction of movement.
Several minimum settings
Units guarded by stop
Position weight is not measured
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Actual moving distance
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Minimum setting unit
Each linear coordinate must be tested at least at the middle and two ends of the stroke, and the error must be calculated according to the provisions of 9.2. The maximum error of the three positions is taken as the error of this item. Each linear coordinate must be inspected.
9.2 Error calculation method
9.2.1 Minimum setting unit error Sa
JB/T 8649.2—1997
The maximum value of the difference between the distance between adjacent stop positions and the minimum setting unit is the minimum setting unit error S., that is: Sa =| L; m Imex
Where: L,---the distance between adjacent stop positions, mm, m-minimum setting unit, mm.
Note: If the actual displacement direction is opposite to the given direction, the displacement should be a negative value. 9.1.2.2 Minimum setting unit relative error Sb20m|ma
Where:
9.3 Tolerance
-The sum of the distances between adjacent stop positions of 20 minimum setting unit instructions, mm. S. According to the specific conditions of the machine tool, it shall be specified by the design, S. shall not exceed 25%. 9.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 10 Linear coordinate origin return test
10.1 Test method
（1）
*（2)
The moving parts on each linear coordinate are tested to return to the origin P. at a 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 Po and the theoretical position P. of the origin is measured each time (see Figure 2). Pe
Each linear coordinate is tested at least at any three positions in the middle of the stroke and near the two ends. The error is calculated according to the provisions of 10.2, and the maximum error value at the three positions is taken as the error of this item. 10.2 Error calculation method
The maximum value of 6 times the standard deviation during the origin return test in each linear coordinate is the origin return error R., that is: R. = 6S
Where: R. —
Origin return error, mm;
Standard deviation when returning to the origin, mm.
Note: S. Calculated according to the relevant formula of GB10931. 10.3 Tolerance
Specified by the design according to the specific conditions of the machine tool. 10.4 Inspection tools
Laser interferometer or reading microscope and metal wire scale. 11 Accuracy inspection of machine tools
11.1 The geometric accuracy inspection of machine tools shall be carried out in accordance with the provisions of JB/T8649.1. (3)
JB/T8649.2-1997
11.2. The working accuracy inspection shall comply with the first grade accuracy of GB4588.1, that is, when the distance between the specified hole position and the reference datum is not greater than 150mm, the position tolerance of the hole center shall not be greater than 0.05mm; when the distance is greater than 150mm, the tolerance shall not be greater than 0.1mm. 11.3 During the working accuracy test, burrs are not allowed on the surface of the test piece and the end face of the hole. 11.4 The machine tool certificate should be accompanied by relevant data and charts of the machine tool position accuracy test. 12
Random technical documents
Random technical documents should comply with the provisions of ZBJ50006, and two copies of the machine tool manual should be provided randomly. 486
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