Some standard content:
National Metrology Technical Specification of the People's Republic of China JJF1124-2004
Calibration Specification for Gear Involute Measuring Instruments Issued on 2004-06-04
Implementation on 2004-12-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine JJF1124—2004
Calibration Specification for Gear Involute Measuring Instruments JJF 11242004
Replaces JJG 91-1989
JJG 93-1981
This specification was approved by the General Administration of Quality Supervision, Inspection and Quarantine on June 4, 2004, and came into effect on December 1, 2004.
Responsible unit:
Main drafting unit:
Participating drafting unit:
National Technical Committee for Geometric Length Metrology Zhejiang Quality and Technical Supervision Inspection Institute China Institute of Metrology
Hangzhou Advance Gearbox Group Co., Ltd.
Hangzhou Iveco Automotive Transmission Co., Ltd. This specification shall be interpreted by the responsible unit
Main drafter of this specification:
Mao Zhenhua
Participating drafter:| |tt||Ni Deguang
JJF1124—2004
(Zhejiang Quality and Technical Supervision Inspection Institute) (China National Institute of Metrology)
(Hangzhou Qianjin Gearbox Group Co., Ltd.) (Hangzhou Iveco Automotive Transmission Co., Ltd.) 1
References
3Overview
JJF1124—2004
3.1Involute measurement principle of mechanical gear measuring instrument3.2CNC gear measurement Instrument involute measurement principle 4 Metrological characteristics
4.1 Coaxiality of upper and lower centers
4.2 Indication error of micrometer system
Instrument tooth profile shape deviation
4.4 Instrument tooth profile tilt deviation and left and right tooth surface difference 4.5 Instrument tooth profile total deviation and repeatability
5 Calibration conditions
Environmental conditions during calibration
5.2 Calibration standards
5.3 Other requirements
Calibration items
Calibration Calibration method
7.1 Coaxiality of upper and lower center axes
7.2 Indication error of micrometer system
7.3 Instrument tooth profile deviation
8 Expression of calibration results
Recalibration time interval
Appendix A Format of the inner page of the calibration certificate
JJF1124—2004
Calibration specification for involute measuring instruments for gears
This specification specifies the calibration items and calibration methods for involute measurement of gear measuring instruments. When the calibrated gear measuring instrument has multiple measuring functions, it should be used together with other specifications to comprehensively evaluate the metrological characteristics of its different functions.
1 Scope
This specification is applicable to the calibration of involute measurement of various gear measuring instruments, but does not include top-mounted tooth profile inspection instruments.
2 References
This specification refers to the following documents:
JF1001—1998 General metrological terms and definitions JJF1059—1999 Evaluation and expression of measurement uncertainty GB/T10095.1—2001 Accuracy of involute cylindrical gears Part 1: Definition and allowable value of tooth surface deviation on the same side of gear teeth
When using this specification, attention should be paid to using the current valid versions of the above referenced documents. 3 Overview
Gear measuring instruments can be divided into two categories: mechanical and numerical control. 3.1 Mechanical gear measuring instrument Involute measurement principle Mechanical gear measuring instruments include single-disc type, graded disc type and lever disc type, etc. It is based on the principle of gear involute generation, generates theoretical involute through mechanical mechanism, uses sensors to compare the actual curve of the measured piece with the theoretical involute trajectory, and inputs the difference into the recorder to give the involute deviation curve. Its structure is shown in Figure 1. 3.2 Principle of involute measurement of CNC gear measuring instrument CNC gear measuring instrument adopts the principle of coordinate measurement. The coordinate position of the point on the actual curve of the measured part is measured by the angle measuring device (circular grating, etc.) and the length measuring device (long grating, etc.), and the involute deviation curve is obtained by comparing it with the theoretical curve of the involute. Its structure is shown in Figure 2.
4 Metrological characteristics
4.1 Coaxiality of upper and lower centers
4.2 Indication error of micrometer system
4.3 Deviation of tooth profile shape of instrument
4.4 Tilt deviation of tooth profile of instrument and difference of left and right tooth surface of instrument4.5 Total deviation and repeatability of tooth profile of instrument
The above characteristics are shown in Table 1 for reference during calibration. Print
JJF1124-—2004
Figure 1 Mechanical gear measuring instrument
1-Steel side mechanism; 2-Base disc: 3-Lower center; 4-Column: 5-Probe; 6-Upper center; 7-Vertical slide; 8-Indicator; 9-Reading microscope; 10-Recorder: 11-Measuring slide: 12-Fixed base slide Table 1
Measurement of gear level
Coaxiality of upper and lower center axes
Indication error of micrometer system
Tooth profile shape deviation
Base circle diameter d, = (25~400) mm
Tooth profile tilt deviation
Base circle Diameter dg = (25~400) mm
Tilt deviation Left and right tooth surface difference
Total deviation of tooth corridor
Base circle diameter dg = (25~400) mm
Total deviation repeatability
5 Calibration conditions
5.1 Environmental conditions during calibration
Unit: μm
JJF1124—2004
Figure 2 CNC gear measuring instrument
1 Base; 2 Control computer; 3 A tangential slide; 4—Vertical slide; 5 Radial slide; 6—Sensor; 7—Column; 8—Upper tip: 9—Lower tip; 10 Workbench temperature: See Table 2.
Measurement gear level
Temperature change
Level 4 and above
(20±0.5)℃
Level 5~8
(20±1)℃
Level 9 and below
(20±3)%
1℃/h
Humidity ≤70%RH.
There should be no dust, noise, airflow, corrosive gas and strong magnetic field around the instrument room that may affect the measurement. 5.1.3
Standard for calibration: See Table 3.
Calibration items
Coaxiality of top and bottom centers
Indication error of micrometer system
Shape deviation of instrument tooth profile
Tilt deviation of instrument tooth profile and left and right tooth surface differenceTotal deviation and repeatability of instrument tooth profile
Other requirements
Standard
Torsion spring table or micrometer, mandrel
3 equal blocks
Involute sample
Involute sample
Involute sample
JJF 1124---2004
5.3.1Power supply voltage, gas source pressure, flow rate, etc. shall comply with the requirements of the instrument manual. 5.3.2The calibrated instrument and the calibration standard instrument shall be isothermal at the same time, and the temperature difference shall not exceed 0.5℃. 5.3.3 Necessary preparations should be carried out according to the requirements of the instruction manual, such as preheating, calibration of the probe and the tip, and instrument zeroing.
6 Calibration items
See Table 3 for calibration items and standards.
7 Calibration method
Before calibration, it should be confirmed that there are no appearance defects or instrument failures that may affect the correct implementation and calibration results of the calibration. 7.1 Coaxiality of the upper and lower center axes
Install the 200mm and 400mm mandrels between the two centers respectively, so that the torsion spring gauge contacts the upper end of the mandrel. During calibration, the torsion spring gauge and the mandrel rotate with the main shaft, as shown in Figure 3. The maximum change in the torsion spring indicated value is the coaxiality. Figure 3 Calibration of coaxiality
1 Lower center; 2-mandrel; 3 Upper tip; 4-torsion spring gauge; 5-meter stand 7.2. Indication error of micrometer system
According to the measuring range of micrometer system, select 5 gauge blocks with corresponding size intervals for calibration. First, use the smallest (largest) size gauge block to zero, and then use other gauge blocks to calibrate the positive (negative) indication error of each point. The indication error of the calibrated point is calculated as follows:
8 - (L -Lo)
×100%
Where: r
-i point reading value;
L—actual size of the i-th gauge block;
[The measuring range used by the micrometer system during calibration;
L. —actual size of the zero gauge block.
When direct calibration with gauge blocks is not possible, other methods with equal accuracy can also be used. 7.3 Instrument tooth profile deviation
7.3.1 Measurement
JJF1124——2004
a) The measurement should be carried out within the effective range of the involute of the template. The magnification ratio is 1:1 in the direction of the curve length and 1000:1 in the direction of the tooth friction deviation. b) According to the specifications of the instrument, select at least two standard involute templates with different base circle sizes to calibrate the left and right tooth profiles.
c) Measurement of the left tooth profile: Use a $3mm or 96mm measuring head to perform 5 repeated measurements at the corresponding starting point and middle section of the left tooth surface to determine the tooth profile shape deviation, tilt deviation, total deviation and repeatability. d) Flip the involute template, the left tooth profile of the template becomes the right tooth profile, and the original left tooth surface measured in item c) is now the right tooth surface. Measure again at the same position to determine the left and right tooth surface difference. e) Measurement of the right tooth profile: The method is the same as item c). 7.3.2 Determination of tooth profile deviation value
Based on the measured curve and the definition specified in the national standard, the tooth profile shape deviation (f.), tooth profile inclination deviation (fh.), and tooth profile total deviation (f.) are determined respectively. a) Determination of instrument tooth profile shape deviation value
The difference between the shape deviation of the measured curve (or reading) and the shape deviation of the template is calculated as the shape deviation, recorded as ftat, and the maximum value of 5 times f is taken as the instrument tooth profile shape deviation f. : fta=(fra)mxt i=l,2,,5
b) Determination of instrument tooth profile inclination deviation value
The difference between the inclination deviation of the measured curve (or reading) and the inclination deviation of the template is calculated as the tooth profile inclination deviation, recorded as Fhar. Take the maximum value of Har for 5 times as the instrument tooth profile inclination deviation fHa: fha= (fhat)mx, i=l, 2,\,5
）Determination of the instrument's total tooth profile deviation and repeatability①Calculate the difference between the total tooth profile deviation of the measured curve (or reading) and the total tooth profile deviation of the sample, record it as F, and take the maximum value of F for 5 times as the instrument's total tooth profile deviation F: F,-(F.)mx,i=1, 2, ..,5
The above deviations are determined separately for the left and right tooth profiles.②Repeatability
The repeatability is calculated using the total tooth profile deviation.
For instruments measuring gears of level 5 and below, the measurement number is 5 times, and the repeatability s is calculated by the range method: Famax - Famin
For instruments measuring gears of level 4 and above, the measurement number is not less than 10 times, and the repeatability s is calculated by the Bessel formula
d) The difference between the tooth profile inclination deviation measured by flipping and the average value of the tooth profile inclination deviation measured 5 times is the left and right tooth surface difference of the instrument's tooth profile inclination deviation.
Expression of calibration results
After calibration, a calibration certificate should be issued for the gear involute measuring instrument. The contents of a calibration certificate should generally include: 5
Title: Calibration Certificate;
Laboratory name and address;
Certificate number, page number and total number of pages
Place of calibration;
Name and address of the client;
JJF1124—2004
Equipment to be calibrated: Gear involute measuring instrument; Manufacturer, model, specification and number of the equipment to be calibrated: Calibration date;
Signature of the calibrator and signature of the certificate issuer; Identification of the technical specification on which the calibration is based, including name and code; Traceability and validity statement of the measurement standard used for this calibration; - Calibration environment conditions;
- A statement that the calibration certificate shall not be partially reproduced without the permission of the laboratory; Calibration results and their measurement uncertainty.
If the calibrated instrument needs to be judged for conformity, the metrological characteristic indicators can refer to the requirements of metrological characteristics in Chapter 4. 9
Recalibration time interval
The recalibration time interval of the gear involute measuring instrument shall be determined according to the usage of the instrument. It is generally recommended not to exceed 1 year.
Appendix A
Calibration based on technical documents
Main equipment used for calibration
1. Coaxiality of upper and lower centers
2. Indication error of micrometer system
3. Instrument tooth profile deviation
Probe diameter:
Measurement magnification ratio:
Base circle radius r:
Tooth profile shape deviation:
Tooth profile tilt deviation:
Tilt deviation
JJF1124—2004
Inner page format of calibration certificate
Calibration location, environmental conditions
Equipment validity date
Calibration results
Deviation direction 1000:1
Length direction 1 :1
Left tooth surface
Left and right tooth surface difference:
Total deviation of tooth profile:
Repeatability of total deviation of tooth profile:
Tooth profile deviation curve:
Measurement uncertainty of this tooth profile deviation: Right tooth surface
National Metrology Technical Specification of the People's Republic of China
Calibration Specification of Gear Involute Measuring Instruments
JJF1124—2004
Published by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Published by China Planning Press
No. 2, West Street, Hepingli, Beijing
Postal Code 100013
Tel (010) 64275360
E-mall jifxb@ 263.net.cn
Printed by Beijing Dixin Printing Factory
Published by Beijing Xinhua Bookstore
All rights reserved. No reproduction allowed
880mm×1230mm16-page
1st edition in October 2004
Printing sheet 0.75 Word count 10,000 words
1st printing in October 2004
Print run 1-20005
The above deviations are determined by left and right tooth profiles respectively. ② Repeatability
The repeatability is calculated by the total deviation of the tooth profile.
For instruments measuring gears of level 5 and below, the number of measurements is 5, and the repeatability s is calculated by the range method: Famax - Famin
For instruments measuring gears of level 4 and above, the number of measurements is not less than 10 times, and the repeatability s is calculated by the Bessel formulabzxz.net
d) The difference between the inclination deviation of the tooth profile measured by flipping and the average value of the inclination deviation of the tooth profile measured by 5 repeated measurements is the left and right tooth surface difference of the instrument's tooth profile inclination deviation.
Expression of calibration results
After calibration, a calibration certificate should be issued for the gear involute measuring instrument. The contents of a calibration certificate should generally include: 5
Title: Calibration Certificate;
Laboratory name and address;
Certificate number, page number and total number of pages
Place of calibration;
Name and address of the client;
JJF1124—2004
Equipment to be calibrated: Gear involute measuring instrument; Manufacturer, model, specification and number of the equipment to be calibrated: Calibration date;
Signature of the calibrator and signature of the certificate issuer; Identification of the technical specification on which the calibration is based, including name and code; Traceability and validity statement of the measurement standard used for this calibration; - Calibration environment conditions;
- A statement that the calibration certificate shall not be partially reproduced without the permission of the laboratory; Calibration results and their measurement uncertainty.
If the calibrated instrument needs to be judged for conformity, the metrological characteristic indicators can refer to the requirements of metrological characteristics in Chapter 4. 9
Recalibration time interval
The recalibration time interval of the gear involute measuring instrument shall be determined according to the usage of the instrument. It is generally recommended not to exceed 1 year.
Appendix A
Calibration based on technical documents
Main equipment used for calibration
1. Coaxiality of upper and lower centers
2. Indication error of micrometer system
3. Instrument tooth profile deviation
Probe diameter:
Measurement magnification ratio:
Base circle radius r:
Tooth profile shape deviation:
Tooth profile tilt deviation:
Tilt deviation
JJF1124—2004
Inner page format of calibration certificate
Calibration location, environmental conditions
Equipment validity date
Calibration results
Deviation direction 1000:1
Length direction 1 :1
Left tooth surface
Left and right tooth surface difference:
Total deviation of tooth profile:
Repeatability of total deviation of tooth profile:
Tooth profile deviation curve:
Measurement uncertainty of this tooth profile deviation: Right tooth surface
National Metrology Technical Specification of the People's Republic of China
Calibration Specification of Gear Involute Measuring Instruments
JJF1124—2004
Published by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Published by China Planning Press
No. 2, West Street, Hepingli, Beijing
Postal Code 100013
Tel (010) 64275360
E-mall jifxb@ 263.net.cn
Printed by Beijing Dixin Printing Factory
Published by Beijing Xinhua Bookstore
All rights reserved. No reproduction allowed
880mm×1230mm16-page
1st edition in October 2004
Printing sheet 0.75 Word count 10,000 words
1st printing in October 2004
Print run 1-20005
The above deviations are determined by left and right tooth profiles respectively. ② Repeatability
The repeatability is calculated by the total deviation of the tooth profile.
For instruments measuring gears of level 5 and below, the number of measurements is 5, and the repeatability s is calculated by the range method: Famax - Famin
For instruments measuring gears of level 4 and above, the number of measurements is not less than 10 times, and the repeatability s is calculated by the Bessel formula
d) The difference between the inclination deviation of the tooth profile measured by flipping and the average value of the inclination deviation of the tooth profile measured by 5 repeated measurements is the left and right tooth surface difference of the instrument's tooth profile inclination deviation.
Expression of calibration results
After calibration, a calibration certificate should be issued for the gear involute measuring instrument. The contents of a calibration certificate should generally include: 5
Title: Calibration Certificate;
Laboratory name and address;
Certificate number, page number and total number of pages
Place of calibration;
Name and address of the client;
JJF1124—2004
Equipment to be calibrated: Gear involute measuring instrument; Manufacturer, model, specification and number of the equipment to be calibrated: Calibration date;
Signature of the calibrator and signature of the certificate issuer; Identification of the technical specification on which the calibration is based, including name and code; Traceability and validity statement of the measurement standard used for this calibration; - Calibration environment conditions;
- A statement that the calibration certificate shall not be partially reproduced without the permission of the laboratory; Calibration results and their measurement uncertainty.
If the calibrated instrument needs to be judged for conformity, the metrological characteristic indicators can refer to the requirements of metrological characteristics in Chapter 4. 9
Recalibration time interval
The recalibration time interval of the gear involute measuring instrument shall be determined according to the usage of the instrument. It is generally recommended not to exceed 1 year.
Appendix A
Calibration based on technical documents
Main equipment used for calibration
1. Coaxiality of upper and lower centers
2. Indication error of micrometer system
3. Instrument tooth profile deviation
Probe diameter:
Measurement magnification ratio:
Base circle radius r:
Tooth profile shape deviation:
Tooth profile tilt deviation:
Tilt deviation
JJF1124—2004
Inner page format of calibration certificate
Calibration location, environmental conditions
Equipment validity date
Calibration results
Deviation direction 1000:1
Length direction 1 :1
Left tooth surface
Left and right tooth surface difference:
Total deviation of tooth profile:
Repeatability of total deviation of tooth profile:
Tooth profile deviation curve:
Measurement uncertainty of this tooth profile deviation: Right tooth surface
National Metrology Technical Specification of the People's Republic of China
Calibration Specification of Gear Involute Measuring Instruments
JJF1124—2004
Published by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Published by China Planning Press
No. 2, West Street, Hepingli, Beijing
Postal Code 100013
Tel (010) 64275360
E-mall jifxb@ 263.net.cn
Printed by Beijing Dixin Printing Factory
Published by Beijing Xinhua Bookstore
All rights reserved. No reproduction allowed
880mm×1230mm16-page
1st edition in October 2004
Printing sheet 0.75 Word count 10,000 words
1st printing in October 2004
Print run 1-2000
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