JB/T 8360.2-1996 Technical requirements for CNC gear hobbing machines
Some standard content:
Mechanical Industry Standard of the People's Republic of China
CNC Gear Hobbing Machine
1 Subject Content and Scope of Application
Technical Conditions
This standard specifies the requirements for the manufacture and acceptance of CNC gear hobbing machines. JB/T8360.2—96
This standard applies to vertical CNC gear hobbing machines with a maximum workpiece diameter of 125~2000mm. CNC non-circular gear milling machines can refer to the provisions of this standard.
2 Reference standards
GB5226
Machine tool electrical equipment
General technical conditions
GB6576
GB9061
JB4139
Machine tool lubrication system
General technical conditions for metal cutting machine tools
Technical conditions for safety protection of metal cutting machine tools and machine tool accessoriesJB/T 8360. 1
ZB J50 002
ZBJ50003
ZB J50 004
ZB J50 007
Precision of CNC gear hobbing machines
General technical requirements for digital control systems of machine toolsDetermination of cleanliness of metal cutting machine tools
Determination of sound pressure level of noise of metal cutting machine toolsTechnical requirements for CNC systems of stepper motor driven machine toolsGeneral technical requirements for machining parts of metal cutting machine tools ZBnJ50008.1
General technical requirements for welded parts
ZBnJ50008.2Metal cutting machine tools
ZBnJ50008.3General technical requirements for assembly of metal cutting machine tools ZBJ50009Method for determination of oil mist concentration of metal cutting machine tools6General technical requirements for hydraulic systems of metal cutting machine tools ZB J50008. 016
JB/Z276 Accuracy Grades for Metal Cutting Machine Tools
3—General Requirements
3.1 This standard specifies and supplements GB9061, ZBJ50002, 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 from time to time. 3.2 When accepting machine tools according to this standard, the machine tool accuracy shall be assessed according to the V-level accuracy requirements specified in JB/Z276. 4 Accessories and Tools
4.1 The accessories and tools listed in Table 1 shall be supplied randomly. 4.2 Special accessories and software may be supplied according to agreement. Approved by the Ministry of Machinery Industry of the People's Republic of China on April 22, 1996 and implemented on July 1, 1996
Hob spindle
Exchange gear
Workpiece spindle
Special wrench
Workpiece support
Anchor screw
5 Safety and Health
Adjusting machine tools and clamping hobs
Adjusting machine tools
Adjusting machine tools and clamping workpieces
Adjusting and operating machine tools
Clamping tools For the spindle
For the machine tool
For the machine tool
JB/T8360.2—96
Including the gasket, flat key, sleeve and nut installed on the spindle. Full CNC gear hobbing machine does not include
Packaging Gasket, nut and adapter installed on the spindle 5.1 The exposed pulleys, flywheels, sprockets and other parts on the machine tool that may cause damage to people or equipment must adopt corresponding safety measures or set safety protection devices, and should comply with relevant regulations such as JB4139. 5.2 The operating surface and back between the small columns must be equipped with protective devices. The protective device of the machine tool operating surface must be easy to observe. If there is an observation window, its material should be transparent safety plexiglass, and the thickness should not be less than 4mm. 5.3 The distance between the inner surface of the protective device and the outer surface of the moving parts, the distance between the inner surface of the door cover of the feed box and transmission box and the end of the rotating parts, the distance between the inner surface of the protective device of the exposed pulley, flywheel, sprocket and the rotating parts, etc., shall generally not be less than 15mm.
5.4 The upper end of the column guide shall be equipped with a protective device, and the lower end of the slide rail and both ends of the horizontal rail of the workbench (or column) shall be equipped with a dustproof device. 5.5 The movable parts such as the tool holder slide, tool holder tangential slide, workbench (or column), external bracket, tool holder rotation, etc. shall be equipped with a maximum travel limit device.
5.6 The parts with the indexing worm pair oil pool, tool holder arc bevel gear pair oil pool, etc. shall be equipped with an observation window, and the column, tool spindle and tool holder helical gear pair or worm pair oil pool shall be equipped with an oil level indicator. 5.7 After emergency stops, the radial movement of the worktable (or column), the rotation of the worktable, the axial movement of the slide and the external bracket, the rotation of the tool spindle, and the A-axis rotary movement shall not automatically resume function. 5.8 The operating mechanism for the rapid up and down conversion of the slide or the rapid up and down conversion to axial feed, the radial rapid feed conversion of the worktable (or column) to retraction or conversion to radial feed, the spindle speed conversion, the up and down conversion of the external bracket, etc. shall be equipped with an interlocking device. If the interlocking transmission device cannot be set for the mechanical transmission, the corresponding sign shall be set near the operating mechanism. 5.9 For hobbing machines with a maximum workpiece diameter greater than 800mm, when the operator needs to stand on the machine to load and unload tools or workpieces, an anti-slip support surface or a special support plate shall be provided. 5.10 The device for fixing the cooling nozzle shall be safe and reliable. The cooling pipeline shall not hinder the operation and the operation of the tool holder, slide, worktable and other components, and the oil circuit shall be unobstructed.
5.11 The chip removal surface of the worktable shell and the bed should be an inclined surface, and the angle with the horizontal plane should not be less than 5°. Generally, there should be an automatic chip removal device. 5.12 Machine tools with ball screws should be equipped with braking devices (such as electromagnetic clutches that have braking effects, etc.). 5.13 When the machine tool is running, there should be no abnormal screaming or impact sounds. When the machine tool is running at low, medium and high speeds in the forward and reverse directions, the noise of the machine tool is measured according to the method specified in ZBJ50004, and the noise sound pressure level shall not exceed 83dB(A). 5.14 Machine tools used for high-speed cutting and prone to oil mist should have oil mist treatment devices, and the oil mist concentration should be randomly checked according to the provisions of ZBJ50009. 5.15 The machine tool should have a fault display device. 5.16 The operating force of the handwheel and handle should not exceed the provisions of Table 2. 5.17 When accepting machine tools according to this standard, the remaining acceptance items in JB4139, GB5226, GB6576 and ZBJ50016 that are not specified in this standard must be inspected at the same time. 754
Operation handle name
Workbench (or column) moving handle
External bracket operation handle
Momentary lubrication handle
Spindle speed change handle
Slide plate up and down moving handle
6Machining and assembly quality
JB/T8360.2—96
Machine tool weight
>2～5
The machined parts shall comply with the relevant provisions of drawings, process documents and ZBnJ50008.1. The assembly of machine tools shall comply with the provisions of 6.1
of ZBnJ50008.3.
6.2 The bed, column, worktable, worktable housing, tool holder slide, indexing worm gear, tool holder housing, small column and transmission box are important castings and must be aged after rough machining. 6.3 The following guide rails and main parts of the machine tool should take wear-resistant measures and should comply with the provisions of relevant standards for material and heat treatment. a. Bed guide rails, column guide rails, combined tool holder (or tangential tool holder) guide rails, worktable circular guide rails and tool holder rotary guide rails with A axis;
b. Hob spindle, axial feed screw nut pair, radial feed screw nut pair, tangential feed screw nut pair, indexing worm (or gear) pair, tool holder end gear (or multi-head worm) pair, worktable centering sleeve, etc. 6.4 The following joint surfaces shall be assessed according to the requirements of “important fixed joint surfaces”: a.
The joint surface between the transmission box and the column (or bed) of the machine tool; b. The joint surface between the main transmission bevel gear seat and the tool holder slide plate surface; the mounting surface of the stepper motor and servo motor;
d. The joint surface of the pressure plate of the sliding guide.
6.5 The following joint surfaces shall be assessed according to the requirements of “particularly important fixed joint surfaces”: The joint surface between the bed and the column (or worktable shell); a.
The joint surface between the bottom surface of the small column and the worktable shell (or bed); b.
The joint surface between the indexing worm support, the worktable shell and the adjustment pad; d. The joint surface of the ball screw nut base. 6.6 The column guide pair, the worktable circular guide pair, the tool holder tangential guide pair, the bed guide pair and the tool holder rotary guide pair with A axis shall be assessed according to the requirements of “sliding guide”. The rest shall be assessed according to the requirements of "relocation guide rail". 6.7 The welds of welded parts and welded assemblies of machine tools shall be flat and free of cracks, and shall comply with the provisions of ZBnJ50008.2. 6.8 A certain gap value shall be left at the joints of steel or copper guide rails and spliced guide rails. The misalignment of the guide surfaces of adjacent guide rails at the joints shall comply with the provisions of ZBnJ50008.3.
6.9 The spindle system should be subjected to a dynamic balance test after assembly, and its operation should be smooth, flexible and light. 6.10 The ball screw pairs installed on each motion coordinate axis should be operated after assembly, and their reverse clearance value and axial movement of the screw should meet the design requirements.
6.11 The cleanliness of the machine tool shall be inspected according to the method specified in ZBJ50003, and the workbench, tool holder, lubrication system and hydraulic system shall be inspected by weight. bZxz.net
a. The impurities and dirt inside the workbench and tool holder should not exceed the requirements of Table 3. 755
Part name
Workbench
10 000
JB/T 8360.2—96
Machine tool maximum workpiece diameter mm
>320～800
>8001250
Weight of impurities and dirt
b. Cleanliness of hydraulic system. Take a sample from the oil return port of the hydraulic system (or lubrication system) immediately after the machine tool is started and operated for 30 minutes. Generally, it should be not less than 200mL, and its impurities and dirt should not exceed 150 mg/L. 6.12 Check that the meshing clearance of the indexing worm pair shall comply with the provisions of relevant standards and design documents. 7 Machine tool idle running test
7.1 The main motion mechanism of the machine tool tool axis shall be operated in sequence from the lowest speed. The operating time of each speed level shall not be less than 2 minutes. The machine tool with stepless speed regulation shall be operated at low, medium and high speeds. High-speed operation allows the spindle bearing to reach a stable temperature, and the operation time shall not be less than 1h. Measure the temperature and temperature rise of the spindle bearing near the tool spindle bearing, and the value shall comply with the provisions of GB9061. During idling, check the values of each speed, and the deviation shall not exceed ±5% of the nominal value. 7.2 The hydraulic system of the machine tool shall operate continuously at the rated working pressure. After the oil temperature reaches a stable temperature, measure the temperature and temperature rise of the oil, and the value shall comply with the provisions of ZBJ50016.
7.3 The workbench shall be tested for low, medium and high speed idling, and the high-speed operation time shall not be less than 10min. 7.4 During the spindle idling test, measure the idling power of the machine tool at each speed, and the value shall not exceed the design requirements (spot check). 7.5 The linear motion parts of the machine tool shall be tested for low, medium and high feed speeds and fast feed idling strokes respectively, and the movement process shall be stable, flexible and light, without obvious fat and vibration. 7.6 The machine tool spindle starts and stops continuously at medium speed for 10 times, which should be accurate and without faults. 7.7 Check the reliability of the axial feed, rapid lifting and disconnection of the tool holder, and check the reliability of starting and stopping at any given position in the travel range. Check each 5 times, which should be accurate and without faults. 7.8 Check the reliability of the tangential feed, rapid feed, and disconnection of the tool holder, and check the reliability of starting and stopping at any given position in the travel range, and check each 5 times, which should be accurate and without faults. 7.9 Check the reliability of the radial feed, rapid movement and disconnection of the worktable (or column); check the reliability of starting and stopping at any given position in the travel range, and check each 5 times, which should be accurate and without faults. 7.10 Check the reliability of clamping at both ends and the middle position of the tool holder's rotary travel, and check each twice, which should be accurate and without faults. 7.11 Check the reliability of clamping at both ends and the middle position of the small column outer bracket's moving travel, and check each twice, which should be accurate and without faults. 7.12 Operate the "emergency stop" button (or switch) of the machine tool for 5 consecutive times, which should be accurate and trouble-free. 7.13 Use the CNC program to operate the machine tool, and perform forward and reverse start, stop (or brake) and orientation tests on each coordinate axis at medium speed, 10 times each. The action should be flexible and reliable. For the main motion and feed motion of the stepless speed change, the system should also be tested for low, medium, high and fast conversion operations, and the action should be flexible and reliable. 7.14 According to the design requirements, test the CNC functions of the machine tool such as coordinate linkage, positioning, linear interpolation, circular interpolation, etc. Its functions should be reliable, and the action should be flexible and accurate.
7.15 According to the design requirements, test the automatic cycle and profiling functions of the machine tool, which should work normally, have reliable performance, and run smoothly. 7.16 The insulation resistance, withstand voltage, leakage current and anti-interference ability test of the electrical system of the machine tool shall be carried out. Within the specified input voltage variation range, the system function shall be normal and reliable, and shall comply with the provisions of ZBJ50002. Machine tools driven by stepper motors shall also comply with the provisions of ZBJ50007. The protection level of the CNC box shall not be lower than the requirements of IP65. 7.17 The machine tool simulates the processing process and conducts a continuous idle operation test. The time shall not be less than 32 hours (16 hours for simple CNC machine tools). During the idle operation, each part shall work normally, flexibly and reliably, and no faults shall occur. For machine tools controlled by the CNC system, the pause time between each cycle program shall not exceed 0.5min. The test contents of continuous idle operation include: +
a. The tool spindle and each coordinate axis run forward and reverse at low, medium and high speeds, and the high-speed running time shall not be less than 15% of each cycle time;
b. The operation of the linear coordinates shall be within the range close to the full stroke, and any point positioning can be selected; each coordinate is linked;
The cycle process shall include various program functions. d
When a fault occurs, it shall be eliminated and the test shall be repeated. 7.18 According to the design requirements, the minimum setting unit inspection of the X, Y and Z axis linear coordinates shall be carried out. The feed error of the minimum setting unit shall not exceed 6μm; a,
b. The cumulative feed error of the minimum setting unit shall not exceed 25%. The minimum setting unit inspection method is shown in Appendix A (Supplement). 8 Machine tool load test
8.1 Machine tools with a maximum workpiece diameter greater than or equal to 1250mm shall be tested for operation with the maximum weight of the workpiece. Use the low speed and high speed specified in the design to check whether the machine tool is stable and reliable; the machine tool with unloading device should be tested with different loads according to the design requirements.
8.2 The machine tool should be subjected to heavy cutting test to replace the maximum power test and maximum torque test of the main transmission system. During the heavy cutting test, the main motor should reach the rated power (or design power or maximum design torque of the tool spindle). The test piece parameters should meet the following requirements: the module is not less than 4/5 of the maximum module, the pitch circle diameter is not less than 2/5 of the maximum workpiece diameter, the tooth width is not less than 1/10 of the maximum workpiece diameter, and the material is 45# normalized steel. Tool: high speed steel or carbide hob. Cutting parameters: cutting depth t=2m (mp is the test module). Cutting speed v≥25m/min, and the vertical feed S is determined by the design.
Note: For machine tools produced in batches, cast iron HT200 is allowed to be used for test before heavy cutting at 2/3 of the maximum power. 8.3 During the heavy cutting test of the machine tool, each mechanism should work normally without abnormal screaming. There is no obvious chatter mark on the tooth surface of the test piece. 8.4 During the heavy cutting of the machine tool, check the metal removal amount of the machine tool in unit time according to formula (1) to evaluate the productivity of the machine tool (spot check). P=(WW,)/t
W2-gear weight, kg;
t cutting time, h.
9 Machine tool precision inspection
9.1 The machine tool precision inspection shall be carried out according to JB/T83601, and the inspection shall be qualified once, and the measured data shall be filled in the certificate of qualification. 9.2 The maximum allowable value of the tooth surface roughness Ra of the test piece after fine rolling for working precision inspection is 3.2um. ·(1)
JB/T8360.2--96
Appendix A
Minimum setting unit inspection method
(Supplement)
A1 First, quickly move the moving part on the coordinate in the positive (or negative) direction for a certain distance. After stopping, give several minimum setting unit instructions in the same direction and stop again. This position is used as the reference position. Give a minimum setting unit instruction each time, move in the same direction, move 20 units continuously, and 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 final measurement position. The stop positions of these several minimum setting unit instructions are not measured. Then, starting from the final measurement position, give a minimum setting unit instruction each time, continue to move in the negative (or positive) direction to make it return to the reference position, and measure the stop position of each instruction (see Figure A1). At least three positions in the middle and near both ends of the stroke are measured. When returning, remove the moving distance of several set units and do not measure the actual moving distance
Measuring range L20
Number of instructions in the minimum setting unit
The minimum setting unit feed error is equal to (L-m) mx, where: a.
- The distance between adjacent positions, mm; m—
The minimum setting unit quantity.
The minimum setting unit cumulative error is equal to (L20-20m)/20m×100%, where: b,
L20—- The total distance of 20 unit experimental moves. Additional remarks:
This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Chongqing Cylindrical Gear Machine Tool Research Institute. This standard is drafted by Chongqing Cylindrical Gear Machine Tool Research Institute. 758
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