JJF 1121-2004 Calibration specification for handheld pitch comparator JJF1121-2004 Standard download decompression password: www.bzxz.net
This specification is applicable to the calibration of handheld pitch comparators with a graduation value of 1μm and a module of 2mm~15mm and 10mm~16mm.

National Metrology Technical Specification of the People's Republic of China JJF1121—2004
Calibration Speciffcatfon for Hand-hold Pitch Cumparator2004-06-04 Issued
Implementation on 2004-12-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine I.PF1121—2004
Calibration Specification for Hard -- hold Pitch ComparatorHF 1121-—2004
Original Part J 79--1982
This specification was approved by the General Administration of Quality Supervision, Inspection and Quarantine on June 4, 2004 and implemented on December 1, 2004 Effective from January
Responsible unit:
Drafting unit:
National Technical Committee for Geometric Length GaugesDongfeng Motor Corporation Metrology Institute
This specification shall be interpreted by the responsible unit
Drafter of this specification:
JIF 1121—2004
(Dongfeng Motor Corporation Metrology Institute)
References
3 Overview
4: Gauge characteristics
4.1 Indicator
4.2 Indication characteristics
4.3 Indication error
5 Calibration conditions
5.1 Environmental conditions
Calibration items and standards
6 Calibration items and calibration methods
6.1 Indicator
6.2 Repeatability of indication
6.3 Error of indication
Determination of calibration result
8 Recalibration error
Appendix A Contents of calibration certificate
JJF 1121—2004
Appendix H Measurement and evaluation of uncertainty of indication error of handheld pitch comparator (1)
1 Scope
J3F112I—204
Calibration specification for handheld pitch comparator
This specification is applicable to the calibration of handheld pitch comparators with a graduation value of 1μm, a module of 2mm-15mm and a modulus of 10mm~16mm.
2 References
The following documents contain clauses that constitute the text of this specification through reference in this specification; when this specification is published, the versions shown are valid, and all standards, specifications or procedures will be revised. All parties using this specification should explore the possibility of using the latest versions of the following documents. JF10D1—19% General measurement terms and definitions Evaluation and expression of measurement uncertainty
JF 1059 —1949
Gear accuracy with involute circle sample Part 1: Determination and allowable values ​​of inner surface deviation on the same side of the gear
/%1%201.1-2002 Standard for inspection of selected gears Part 1: Inspection of tooth surfaces on the same side of gear teeth 3 OverviewbzxZ.net
Hand-held pitch comparator is an instrument that uses the relative method to measure the relative tooth error and cumulative tooth error of external spur gears and internal gears.
The appearance of a typical hand-held pitch comparator is shown in Figures 1 and 2. 1. Body
Fixed jaws
Support ratio
Aizhou explosion
Fixed modulus to line fixed measurement activity blood requirement design diagram
Fixed modulus!
After the protrusion
Modular quantitative disk is not fixed
4 Metrological characteristics
4.1 Indicator
JJF112[—2004
Conform to the requirements of the standard verification specification (calibration specification), 4.2 Indication repeatability
Indication repeatability is not less than 1um
4.3 Indication error
Indication error should not exceed the provisions of Table 1:
Indication error
Measurement modulus/nun
2 ~ 13
Maximum allowable indication error
Any 0.1mm interval
± 4,m
Note: For calibration, the calibration will not be interrupted and lost, the three metrological indicators are for reference. Calibration conditions
5.1 Environmental conditions
5.1.1 Temperature: (20±6)
5.1.2 The instrument to be calibrated should be allowed to balance the salinity at room temperature for at least 4 hours. 5.2 Liquid-activated standard monitors and corresponding standards are shown in Table 2. Table 2 Calibration items and corresponding standards for handheld monitors. Serial number
Calibration items and calibration methods
Standard items
Hong Kong small table
|Indication accuracy
Indication error
In the range of
-15μm
Standard instrument
Safety inspection regulations (calibration standards)
Grade 5 and above. (2~16?mm standard wheel
Universal engineer micro-pin
Before calibration, it should be confirmed that there are no appearance defects and mechanical failures that affect the correct implementation and calibration results. G.1 Indicator
Verify (or calibrate) according to the relevant inspection regulations (or calibration specifications). 6.2 Indication accuracy
And level 5 is changed to level 5 with a modulus of (2 -16) mm) When the standard gear reaches the standard, the gear with the pitch comparator is placed on the inspection plate, the positioning head of the pitch comparator is connected to the gear surface, the two probes are aligned near the index page, and the same section is measured five times. The indication value is repeated 2 times. The indication error of the pitch comparator is calibrated on the microscope (hereinafter referred to as the microscope). Before calibration, a fixed plane is installed on the microscope. The half plane is moved vertically with the moving plane. The two pitch comparators are installed on the microscope so that the movable probes are in vertical contact with the north plane. Move the plate to make the indicating gauge pressure 10-15 degrees. During calibration, make calibration points every 0.1mm within the correct travel of 1mm. The maximum difference between the displayed concentration number and the bottom display number is determined by the error. The calibration result can be expressed by other correction methods required by the holding type pitch comparator. The calibration result of the holding type pitch comparator is expressed by the factory calibration certificate. The recalibration time interval can be determined according to the actual situation. It is generally not recommended. Appendix A
JJF 1121—2004
Contents of calibration certificate
The contents of the calibration certificate should be clearly arranged and include the following information: 1. Title: Calibration Certificate;
2. Name and address of the calibration laboratory;
3. Location where the calibration was carried out (if the calibration is not carried out in the laboratory);
4. Calibration certificate number, page number and total number of pages;
5. Name and address of the client
6. Name of the equipment being calibrated;
7. Manufacturer, model specification and factory number/series number of the equipment being calibrated;
8. Calibration date ：
9. Name of calibrator: Signature, Name of verification personnel: Signature, Name of card management personnel: Signature: 1. Explanation of the measurement source and validity of the calibrator used for calibration: 11. Explanation of the use of this calibration specification and any deviation, addition or omission from this specification: 72. Ambient temperature during calibration:
13. Calibration evaluation results of the calibration items:
14. Measurement uncertainty under calibration conditions
15. Construction of the interval;
1. Statement that the calibration certificate may not be copied without the permission of the laboratory. 4
Appendix B
JJF1121—2004
The measurement uncertainty of the indication error of the handheld pitch comparator is evaluated by measuring the handheld pitch comparator with a segment graduation value of m. BI mathematical model
A handheld distance comparison only shows careful error; [——The handheld gear year comparator shows:
10,000T display value.
.2 According to the mathematical model, the variance and the sensitivity coefficient are calculated according to) = 3) to obtain
variance:
sensitivity coefficient:
So:
B,3 Calculate the standard uncertainty
(A)-()m(-()u(1)
c() =dfal =1:
e(1,)-o03t,=-1:
(8)-u() +±()
B.3.1 Standard uncertainty of the reading B,3.1.1 Standard uncertainty of the repeatability of the measurement (Bt)
The standard deviation is obtained by repeating the measurement 10 times with a handheld tooth comparator calibrated with a universal display, which is 0.26uml. Measure once in the actual measurement. tta) = s//1 - 0.26/T= 0.26urm, its degrees of freedom are
u(6)=10-1=9
1.3.1.2 It is difficult to estimate the uncertainty component of the error caused by the hand-held gear comparator back display [thousand price table] The reading error is 0.m, showing a negative distribution, so u(4±) = e,/4/- 0.3/6 =0.12μm. The relative uncertainty of this value is about 20%, then! The degree of freedom is (0.20)-2 = 12.5
(fn)--
The uncertainty of the measurement reading is
utta)=u(ta)+utln)
±([) = /(0.26)* - (0. 12) = 0.286mm. Its degree of freedom is
Pm = μ/2[n(αve
JJF121—2004
()-0.2619+0.1212.5
) = 12
, which is the standard uncertainty component introduced by the error of the displayed value B.3.2
JIPE -(1 +L/100) ru
Processed according to normal distribution, Xia Gain, = 2.58, when L=1 MPE=1rm
u(1,1 = 3PE/, = 1/2.58 = 0. 388μrm Its value is highly variable, and its free distance is
H.4 Standard uncertainty!
Table R,1
Standard uncertainty!
Uncertainty source
Standard uncertainty of measurement readings
Adjustment book Acute performance standard uncertainty components
Standard uncertainty introduced by estimation error
Measurement component
Standard uncertainty introduced by display value error
Combined standard uncertainty
Calibration uncertainty
Value (x,)/um
w =(x)r(x.)
m = Vu(t)+ w(1,)
= (0.286) + (0.388)*
B.6 Effective degree
m = u./2[-(r)u(x.)u.
(.286/12 +(.388/2
1. The estimated distribution of the measured value
V = 96
Normal
Degree of deviation
Evaluation method
Since there is no point advantage in any uncertainty distribution, it can be determined that the measured matrix is ​​close to normal distribution
B.8 Extended uncertainty
JJF1131—204
Degree of deviation ar=96, confidence level = 95%, check (distribution table to get h = t (van) - tog (96) - 1.98 = km, = 1.98 × 0.482 = 0).954n1.×1.tpμm
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