JB/T 9895.2-1999 Technical requirements for CNC vertical chuck lathes
Some standard content:
JB/T 9895.2-1999
This standard is a revision of ZBnJ53016-90 "Technical conditions for CNC vertical chuck lathes". During the revision, only editorial changes were made according to relevant regulations, and the technical content remained unchanged. This standard is a concretization and supplement to GB/T9061-1988 "General technical conditions for metal cutting machine tools" and other standards. This standard is a part of the JB/T9895 "CNC vertical chuck lathe" series of standards, which includes the following two parts: JB/T9895.1-1999 Accuracy inspection of CNC vertical chuck lathes JB/T9895.2-1999 Technical conditions for CNC vertical chuck lathes This standard replaces ZBnJ5301590 from the date of implementation. This standard is proposed by the National Technical Committee for Metal Cutting Machine Tools Standardization. This standard is under the jurisdiction of the Automatic Lathe Branch of the National Technical Committee for Metal Cutting Machine Tools Standardization. The responsible drafting unit of this standard: Shenyang Automatic Lathe Research Institute. This standard was first issued in July 1990.
Machinery Industry Standard of the People's Republic of China
CNC Vertical Chuck Lathe
Technical Conditions
This standard specifies the requirements and test methods for the design, manufacture and acceptance of CNC vertical chuck lathes. JB/T 9895.2—1999
Replaces ZBn J53016—90
This standard applies to CNC vertical chuck lathes and CNC vertical double-axis chuck lathes with a chuck diameter less than or equal to 800mm. 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. GB/T9061—1988 General technical requirements for metal cutting machine tools GB/T10931—1989 Method for evaluating the position accuracy of numerically controlled machine tools GB/T16769--1997 Method for measuring the noise pressure level of metal cutting machine tools JB/T 9872—1999
JB/T 9874--1999
JB/T 9877--1999
General technical requirements for machining parts of metal cutting machine tools General technical requirements for assembly of metal cutting machine tools Determination of cleanliness of metal cutting machine tools
JB/T 9895.1—1999
3 General requirements
Precision inspection of CNC vertical chuck lathe
When accepting machine tools according to this standard, the remaining acceptance items in GB/T9061, JB/T9872, JB/T9874 and other standards that are not specified in this standard must be inspected at the same time.
4 Random accessories and tools
4.1 To ensure the basic performance of the machine tool, the accessories and tools listed in Table 1 should be supplied randomly. Table 1
Wedge-type power chuck
Flange tool holder
External circular cutter
Conical bore sleeve
Reducing sleeve
Adjustment tool
Clamping workpiece
Handle-type tool
Installing cutting tools and accessories
Adjusting machine tools or accessories
4.2 Special accessories to expand the performance of machine tools shall be supplied according to the user's requirements and in accordance with the agreement. 5 Safety and sanitation
Or provide special fixtures according to the agreement
Specifications and quantities shall be specified by the manufacturer
5.1 The door cover and belt wheel cover of the gearbox equipped with the exchange gear shall be interlocked with the start and stop of the main motor and have warning signs. Approved by the State Bureau of Machinery Industry on May 20, 1999 146
Implemented on January 1, 2000
JB/T9895.2-1999
5.2 The movable safety guard shall be interlocked with the working cycle of the machine tool. 5.3 The noise of the machine tool shall be inspected in accordance with the provisions of GB/T16769. The sound pressure level of the whole machine noise during idling shall not exceed 83dB(A). 5.4 The hydraulic, lubrication, cooling, pneumatic systems and other parts of the machine tool shall not leak. 6 Manufacturing quality
6.1 The main parts such as the slide plate, the guide pair of the tool holder, the spindle, etc. must adopt measures to ensure wear resistance and reduce friction coefficient that are suitable for their service life. 6.2 The spindle base, column and slide plate are important castings and must be aged after rough machining. 6.3 The joint surface between the turret tool holder and the slide plate (when the turret tool holder and the slide plate are two components) shall be assessed according to the requirements of "particularly important joint surface".
6.4 The following joint surfaces shall be assessed according to the requirements of "important fixed joint surfaces": a) the joint surface between the gearbox and the base;
b) the joint surface between the column and the base;
c) the joint surface between the column and the steel guide rail;
d) the joint surface between the beam and the steel guide rail.
6.5 The high-speed rotating spindle assembly shall be subjected to dynamic balancing test and calibration after assembly, and the balancing quality shall be G2.5. ×1032.4×10*
Allowable eccentricity of mass center e--2.5×2 yuan n
Allowable residual unbalance u=me=
Where: m——rotating body mass, kg;
Maximum rotating body speed, r/min.
(g·mm)
(g·mm/kg)
6.6 The cleanliness of the machine tool should be inspected according to the provisions of JB/T9877. The cleanliness of the gearbox and other parts should be inspected regularly by weight inspection method. The impurities and dirt should not exceed the provisions of Table 2. Other parts should be inspected by visual inspection and feel method. There should be no dirt. Table 2
Chuck diameter Dmm
Inspection parts
Gearbox
Hydraulic oil pool
7 Machine tool idle running test
7.1 Function test
7.1.1 General function test
Impurity weight mg
≥500
Use buttons and switches to conduct functional tests on the machine tool to test its flexibility, stability and reliability. The transmission part includes the spindle assembly. 7.1.1.1 Choose any spindle speed to conduct continuous tests of spindle start, forward rotation, reverse rotation, and stop (including braking), and the continuous operation shall be no less than 7 times.
7.1.1.2 The spindle shall be tested for low, medium and high speed conversion, and the tolerance between the command value and the displayed value (or measured value) of the speed shall be ±5%. 7.1.1.3 Choose any feed amount, conduct continuous operation test of start and stop feed, and conduct working feed and rapid feed test on the entire stroke of Z and X axes. The rapid stroke is greater than 1/2 of the full stroke, and the positive and negative directions shall be continuously operated for no less than 7 times. And test the fluctuation value of the servo motor current, and the tolerance value shall be specified by the manufacturer. 7.1.1.4 Conduct conversion test of low, medium and high feed amounts on the entire stroke of Z and X axes. 147
JB/T 9895.2--1999
7.1.1.5 Test with a hand-cranked pulse generator or a single pulse moving crossbeam slide. 7.1.1.6 Perform 7 functional tests on each button switch on the machine tool control panel. 7.1.1.7 Perform locking tests on moving parts with locking mechanisms at any position of their entire travel. 7.1.1.8 Perform positive and negative direction indexing and clamping tests on the turret tool holder. 7. 1. 1. 9
Perform sealing, lubrication and cooling performance tests on the hydraulic, lubrication and cooling systems, requiring easy adjustment, flexible and reliable movement, good lubrication, sufficient cooling, and no leakage in each system.
7. 1. 1. 10
7. 1. 1. 11
7. 1. 1. 12
The chip conveyor device shall be tested for operation, and the operation time shall not be less than 30 minutes. For machine tools with automatic clamping and tool changing mechanisms, automatic clamping and tool changing tests shall be carried out. Functional tests of various indicator lights, photoelectric readers, ventilation systems, etc. of numerical control devices. 7. 1. 1. 13
Test the clamping and loosening of the chuck.
7. 1. 1. 14
Functional tests of the safety, insurance and protective devices of machine tools. 7. 1. 1. 15
Accuracy tests of tool setting and detection devices in the machine. 7.1.2 CNC functional tests
Use CNC instructions to carry out functional tests on machine tools to test their flexibility of action and reliability of functions. 7.1.2.1 The spindle is tested for forward rotation, reverse rotation, stop and spindle speed change (the stepless speed change mechanism is tested for low, medium and high speeds; the stepped speed change mechanism is tested for various speeds).
7.1.2.2 The feed mechanism is tested for low, medium and high feed rate change and rapid feed. 7.1.2.3 The turret tool rest is tested for various indexing and clamping. 7.1.2.4 According to the functions of the adopted numerical control system, test feed overshoot, manual data input, position display, return to machine tool reference point, program, serial number indication and retrieval, program pause, program elimination, linear interpolation, arc interpolation, linear cutting cycle, taper cutting cycle, thread cutting cycle, arc cutting cycle, tool length, tool tip R compensation, screw lead compensation, clearance compensation, fault diagnosis and display, man-machine dialogue menu filling, graphic display, tool cutting process dynamic simulation and other functions. 7.1.2.5 Inching test overtravel software and hardware protection. 7.2 Main motion mechanism idling test
In the non-cutting operation state, the temperature change and no-load power of the test spindle during operation shall be recorded in the format of Table 3. The main motion mechanism of the machine tool starts from low speed and runs at low, medium and high speeds (stepped speed is all speeds, and the operation time of each level is not less than 2min). The spindle bearing should be operated at the highest speed for a sufficient time (not less than 1h) to reach a stable temperature. The temperature and temperature rise of the spindle bearing should not exceed the following regulations: temperature 70℃, temperature rise 40℃.
Measurement time
h or min
Spindle speed
Specified valueWww.bzxZ.net
7.3 Kinematic test of feed system
Measured value
Temperature℃
Spindle bearing
No-load power
Input power
Select an appropriate spindle speed, use low, medium and high feed rates and rapid movement to carry out B and X axis no-load feed test, and record according to the format of Table 4.
Test items
7.4 Continuous idle running test
JB/T9895.2—1999
Command value
mm/r or mm/min
Measured value
mm/r or mm/min
Use CNC program to conduct non-cutting continuous running test under all functions, and the running time shall not be less than 16h. Each cycle time shall not exceed 15min. At the end of each cycle, the machine shall stop to simulate the action of loosening the workpiece. The machine shall stop for no more than 1min before continuing to run. 7.4.1 The spindle is equipped with a chuck, and the speed shall be continuously changed among low, medium and high gears. The operation, forward, reverse, start and stop test of the end face machining at a constant speed shall be conducted. The high-speed running time shall exceed 1/3 of the cycle time. 7.4.2 The Z and X axes shall be changed among low, medium and high gears and the rapid feed amount shall be the full stroke, and the rapid feed stroke shall be greater than half of the full stroke.
7.4.3 The turret is equipped with necessary accessories and arranged so that when it is slightly overweight, all stations of the turret tool holder are converted bit by bit in the positive and negative directions and over-the-counter conversion.
8 Machine tool load test
8.1 Maximum torque and maximum cutting resistance test of the main transmission system 8.1.1 Test method
Cutting is performed by strong turning of the outer circle (without coolant) and recorded in the format of Table 5. Table 5
Feed rate
The feed rate or cutting depth can be gradually changed during cutting to reach the rated value. Work
PP.
JB/T 9895.2—1999
Maximum torque T=9 550(PP.)
(N·m)
Maximum cutting resistance F=T/r（N)
Where: P-input power of the motor during cutting, kW; P
-no-load power when equipped with a workpiece, kW; n-spindle speed (generally equal to or close to the calculated speed), r/min; -cutting radius of the workpiece, m.
8.1.2 Test conditions
75° machine-clamped indexable turning tool, blade material: YW3 coating, cutting amount: specified by the manufacturer.
Test piece material: 45 steel;
Test piece diameter d; D/4～D/2;
Cutting length: L≤D/4(D
chuck diameter).
8.2 Maximum power test of main transmission system (spot check) 8.2.1 Test method
Use high-speed cutting of external circle, the machine tool should reach the rated power of the main motor, and record it in the format of Table 6. Table 6
Cutting conditions
Main motor efficiency.
8.2.2 Test conditions
Feed rate
75° machine clamp indexable turning tool, blade material YW3 coating, cutting amount specified by the manufacturer, turning speed v≥120m/min. Feed rate and cutting depth can be gradually changed during cutting to make the main motor power reach the rated value. Test piece material: 45 steel:
Test piece diameter d: D/4~~D/2;
Cutting length: L≤D/4 (D——chuck diameter). 8.3 Vibration test
8.3.1 Test method
Use cutting to carry out vibration test. The cutting method is shown in Figure 1 and recorded in the format of Table 7. Cut the groove according to the tool width b specified in Table 8. The machine tool should not vibrate and then gradually increase the value of 6 until chatter occurs. Record the actual tool width. 150
Test piece diameter
8.3.2 Test conditions
Spindle speed
Cutting speed
Chuck diameter
>320~500
>500～800
Machine clamp indexable cutter, blade material: YC35; JB/T9895.2—1999
Cutting conditions
Feed rate
Tool angle: front angle %=8°~10°, back angle 8-5°～~6°Tool installation: Tool tip should not be higher than the spindle axis by 0.5mm; Cutting speed: u=100～120m/min
Feed rate: f=0.1mm/r;
Cutting depth: ap≥7 mm,
Test piece material: 45 steel;
Test piece diameter: d~0.2D (D
Chuck diameter):
Distance from cutter to end face of chuck: L=2d.
Machine tool accuracy inspection
9.1 Geometric accuracy and working accuracy inspection
Specified cutting width
Actual cutting width
Cutter to chuck
End face distance quotient
Perturbation state
JB/T9895.2—1999
Accuracy inspection shall be carried out in accordance with the provisions of JB/T9895.1. 9.1.1 Geometric accuracy inspection
The four items of G4, G5, G6 and G7 shall be inspected when the machine tool reaches the medium speed stable temperature. 9.1.2 Working precision inspection
9.1.2.1 The specimen size and cutting specifications shall comply with the provisions of the design documents. 9.1.2.2 The test surface roughness R of the specimen. The maximum allowable value is 1.6μm. 9.2 Thermal deformation test (spot check)
G4, G5, G6, G7 and other items in the geometric precision inspection shall be inspected to inspect the change in their cold and hot state precision. 9.3 Reverse difference test
This test shall be carried out in accordance with JB/T9895.1. While inspecting G8 and G9, data processing shall be carried out to obtain the reverse difference, and the allowable value shall not exceed the provisions of Table 9.
Reverse difference B=Brmx
9.4 Minimum setting unit feed test
The test method is shown in Table 10.
Test diagram
Before clearance compensation
Test method
The plate (or slide plate) first moves to the detection position in the positive direction quickly, and then gives several set units of instructions in the same direction. Taking the stop position as the reference, a single 20 minimum set units are given, and the stop position of each unit instruction is measured. Then, it moves several minimum set units in the negative direction from the final position to eliminate the reverse difference. Based on this, 20 unit instructions are given, and the above inspection is carried out to examine the single minimum set unit. +
9.5 Return to the machine tool reference point test
The test method is shown in Table 11.
The error is calculated as the percentage of the difference between the total moving distance of 20 minimum set units and the input value.
The measurement is carried out at the two ends of the stroke and three positions in the middle. X and Z axis are tested
Testing tools
After clearance compensation
Laser interferometer
Data processing formula:
20i -(Li +-+L2 ) //20iX100%Where:
\Theoretical value of the minimum setting unit;
L.L2DThe measured value of a single minimum setting unit. The error of each unit shall not exceed 100%, that is, it is not allowed to move or one movement reaches 200%
Test diagram
JB/T9895.2—1999
Test method
Make the slide (slide plate) quickly feed back to the reference point from any point on the full stroke of the B axis (or X axis). Measure its actual position and perform at least 7 reference point return tests.
Calculate the reference point errors of the Z and X axes respectively.
The data processing of the error is the same as the evaluation method of repeat positioning accuracy in GB/T10931-
1989 Note: It is applicable to CNC machine tools with fixed reference points. And the actual size of the reference point needs to be detected. 9.6 Tool increment test
9.6.1 Test method
Test tool
Laser interferometer
Indicator
Tolerance mm
Use the tool increment function to input △X (diameter value) and △Z increments for the X axis and B axis respectively. Cut the specimen 5 times according to Figure 2, measure the diameter and length of each time, and record and calculate the difference according to the format of Table 12 and Table 13. The tolerance value shall not exceed the provisions of the above two tables. +
9.6.2 Test conditions
Tool: machine clamped indexable turning tool, the blade material is YW3 coating. L/=12
JB/T 9895.2—1999
Cutting parameters: cutting speed u=100~150m/min; feed rate f=0. 1 mm/r;
Cutting depth ap: AX-0.05mm (diameter value) Az-0.1 mm
Specimen material: 45 steel.
Specimen size: Figure 2 is the reference size of the specimen for a machine tool with a chuck diameter of 500mm. 9.6.3 Error calculation
The measured dimensions and differences in Table 12 and Table 13 are examples of application. The difference between diameters (or lengths) refers to the difference between the maximum and minimum values of the five error values obtained after five cuts for a certain diameter (or length).
The difference between the measured value and the theoretical value refers to the difference between the maximum and the reference value of the error values of a certain diameter (or length) after five cuts, taking the error value of the first diameter D (or length I) of the first cut as the reference. Table 12
Measured diameter
Cutting number
Tolerance between diameters
Cutting number
269,520
Tolerance between lengths
Note: The diameter size of the test piece can be enlarged or reduced in proportion, and the test piece can be used multiple times. 154
Di, Dz, DD.
Tolerance between measured value and theoretical value
(Based on D, dimension)
Tolerance between measured value and theoretical value
32,980
Tolerance between measured value and theoretical value
(Based on L, dimension)
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