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JJG 60-2012: Verification Regulation of Screw Templates
Status: Valid JJG 60: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 60-2012 | English | 439 |
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Verification Regulation of Screw Templates
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JJG 60-2012
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| JJG 60-1996 | English | 399 |
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Verification Regulation of Scriew Thread Gauge
| Obsolete |
JJG 60-1996
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| JJG 60-1984 | English | RFQ |
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(Chinese Industry Standard)
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JJG 60-1984
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PDF similar to JJG 60-2012
Basic data | Standard ID | JJG 60-2012 (JJG60-2012) | | Description (Translated English) | Verification Regulation of Screw Templates | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A52 | | Classification of International Standard | 17.040 | | Word Count Estimation | 19,193 | | Older Standard (superseded by this standard) | JJG 60-1996 | | Quoted Standard | JB/T 7981-2010 | | Regulation (derived from) | AQSIQ Announcement No. 35 of 2012 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine | | Summary | This standard applies to the common thread model and unified thread template initial verification, testing and use of follow-up checks. | JJG 60-2012: Verification Regulation of Screw Templates---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Verification Regulation of Screw Templates
State verification procedures People's Republic of China
Thread model
ScrewTemplates
Issued on. 2012-03-02
2012-09-02 implementation
The State Administration of Quality Supervision, Inspection and Quarantine released
Thread model test procedures
ScrewTemp
lates
Replacing JJG 60-1996
NFP. National Engineering Geometrical Parameters Measurement Technology Committee
Main drafting unit. Liaoning Provincial Institute of Metrology
Participated in the drafting. Jiangxi Institute of Measurement and Testing
Metrology hospital in Guizhou Province
This procedure works commissioned by the National geometric parameter measurement technology committee responsible for the interpretation
The main drafters of this procedure.
Shizuo De (Liaoning Provincial Institute of Metrology)
Na Liu (Liaoning Provincial Institute of Metrology)
Zhang Yu (Liaoning Provincial Institute of Metrology)
Drafters participate.
Where Xiao Yan (Jiangxi Institute of Measurement and Testing)
Lv Xiaojie (Guizhou Province Measurement and Testing Institute)
table of Contents
Introduction (Ⅱ)
1 Scope (1)
2. References (1)
3 Terms (1)
3.1 Unified threads model (1)
4 Overview (1)
5 metering performance requirements (1)
5.1 Face surface roughness (1)
5.2 pitch deviations, tooth-type half-width deviation (2)
6 General Requirements (3)
6.1 Appearance (3)
6.2 Interaction of each part (3)
7 control of measuring instruments (4)
7.1 test conditions (4)
7.2 test project and the main test instrument (4)
7.3 Verification Methods (4)
7.4 Verification Results Processing (5)
7.5 test cycle (5)
Appendix A common thread pitch deviation measurement model Uncertainty Evaluation (6)
Appendix B test certificates/test results in the notice page and format (9)
Introduction
JJG 60-2012 "thread model" in the preparation is JJF1001-2011 "common measurement terms and definitions"
JJF1002-2010 "national verification procedures write rules", JJF1130-2005 "geometric measurement equipment school
Registration Uncertainty Evaluation Guide "as the basis and foundation of JJG 60-1996" thread model "subject to revisions.
Compared with JJG 60-1996 "thread model", in addition to editorial changes, the major technical changes are as follows.
--- Increase verification unified thread model (see Chapter 1);
--- Increase the consistency thread model (see 3.1);
--- Face to face measurement (see 5.1);
--- Working dimension to pitch deviations, tooth-type half-width deviation (see 5.2);
--- To increase the pitch of the thread model deviation measurement uncertainty assessment (see Appendix A);
--- Increase test certificate-page format (see Appendix B).
JJG 60-1996 "thread model" of previously issued as follows.
--- JJG 60-1984 "threaded model."
Thread model test procedures
1 Scope
The order applies to the common thread model and thread unified model of initial verification, use and subsequent verification check.
2. References
This procedure references the following documents.
JB/T 7981-2010 model thread
For dated references, only the dated edition applies to this procedure; undated reference documents
Member, the latest edition (including any amendments) apply to this rule.
3 Terms
JB/T 7981-2010 "thread model" and as defined in the following terms and definitions apply to this procedure.
3.1 Unified threads model unifiedscrewtemplates
Tooth-type angle of 55 ° for the thread model.
4 Overview
Thread pitch and tooth model is having a defined type, and meet certain accuracy requirements of the material measure. Mainly
Comparative Methods thread pitch. A set of threads from the thread model model, the protective plate and locking screws (or rivets) and other groups
Cheng, of the type shown in Figure 1.
Type 1 a schematic diagram of a set of threads template
1- thread model; 2 - locking screws (or rivets); 3- protection board
5 metering performance requirements
Surface roughness of 5.1 Face
Surface of the threaded model face roughness of not more than Ra1.6μm.
5.2 pitch deviations, tooth-type half-width deviation
Thread model thread profile shown in Figure 2. Common thread pitch deviation template, tooth-type half-width deviation should be consistent with Table 1
Requirements, unified thread pitch deviation template, tooth-type half-width deviation shall comply with the requirements of Table 2.
Table 1 common thread tooth type and model of work Size
Pitch P/mm
Basic size limit deviation
Basic tooth type angle α
Limit tooth-type half-angle α/2 of
Deviation/( ')
Thread work part
Length L/mm
0.40
0.45
0.50
0.60
0.70
0.75
0.80
1.00
1.25
1.50
1.75
2.00
2.50
3.00
3.50
4.00
4.50
5.00
5.50
6.00
± 0.010
± 0.015
± 0.020
60 °
± 60
± 50
± 40
± 35
± 30
± 25
± 20
Figure 2 thread form
Table 2 Unified thread template tooth type and size of the work
Number of threads
Pitch P/mm
Basic size limit deviation
Basic tooth type angle
Tooth-type half-angle α/2 of
Limit deviation/( ')
Thread work part
Length L/mm
28 0.907
24 1.058
20 1.270
18 1.411
16 1.588
14 1.814
13 1.954
12 2.117
11 2.309
10 2.540
9 2.822
8 3.175
7 3.629
6 4.233
5 5.080
412 5.644
4 6.350
± 0.015
± 0.020
55 °
± 40
± 35
± 30
± 25
± 20
6 General technical requirements
6.1 Appearance
6.1.1 Face newly created thread model should not have the appearance of defects rust, burrs, scratches and other effects used.
Use threaded model allows does not affect the appearance of defects.
6.1.2 Group threaded model in its protective plate shall be marked with the manufacturer's name of the thread model (factory standard) and product names
And the number of pieces; should clearly mark the pitch or number of threads n on a single thread model.
6.1.3 tooth type 10 times magnification, its working surface contour no obvious bump phenomenon.
Each section 6.2 Interaction
Connecting thread model with a protective plate should be reliable, the rotation should be stable, flexible, non-catching and loosening.
7 control of measuring instruments
Controls include initial verification of measuring instruments, verification and subsequent use of checks.
7.1 verification Conditions
Verification indoor temperature (20 ± 5) ℃. Before measurement, will be seized threaded model placed indoors temperature equilibrium time is not
Less than 2h.
7.2 test project and the main test instrument
The main test items and test instruments are shown in Table 3.
Table 3 test items and test major appliances
No. The main test instrument test project
first
Verification
Follow-up
Verification
Using
an examination
1 Appearance 10x magnification
2 portions of interaction ---
3 Face the surface roughness
Roughness comparison specimens MPE.
(~ 12% -17%)
- -
4 pitch deviation
5 tooth-type half-width deviation
Universal tool microscope MPEV. 1μm 10-5L
Goniometer eyepiece MPE. ± 1 '
- -
Note. The table "" means test should be, "-" indicates do not check.
7.3 Verification Method
7.3.1 Appearance
Sight of the rest.
Each section 7.3.2 Interaction
Manual test.
7.3.3 Face surface roughness
The surface roughness comparison specimens comparative measurements. When comparing specimens and surface roughness are detected amount of the
Surface processing methods should be the same, the surface roughness of the specimen, shape, color and other surface should also be possible with the subject
Consistent measurement surface. When the subject face machining depth of no more than traces of surface roughness specimen processing trace depth Face
When the surface roughness of the face usually does not exceed the nominal value of the surface roughness of the sample block.
7.3.4 pitch deviations, tooth-type half-width deviation
Thread pitch deviation template, tooth-type half-width deviation with universal tool microscope measurements. When measured, the thread will be seized
Template monolithic pressure in the glass table, adjust the template to make it the subject thread crest of the longitudinal connection with the universal tool microscope
Table moves parallel.
7.3.4.1 pitch deviation
Measurement, move the instrument vertical and horizontal coordinates, so that the intersection of the word line meters were aimed at an intermediate position between two adjacent teeth type (such as
Fig. 3), the absolute value of the difference between the two instruments for the indication of the actual pitch of two adjacent teeth. Actual and nominal screw pitch
The difference from the pitch deviation. It should be measured in less than two pitch threaded portion of the measurement model to work, taking the absolute value of the maximum
Pitch deviation measurements.
Figure 3 Figure sight
7.3.4.2 tooth-type half-width deviation
Goniometer eyepiece adjust the instrument so that the vertical chain line subject to any type of tooth flank contour of a line of sight,
Goniometer eyepiece corresponding indication is found subject thread tooth-type half-angle model, tooth-type half-width of the measured value and tooth-type half
The nominal value of the difference angle tooth-type half-width deviation. Should be measured on at least two teeth type threaded working portion of the measurement model,
The maximum absolute value of tooth-type half-angle deviation of the measurement results.
Processing 7.4 Verification Results
After testing in compliance with requirements of this Regulation threaded model calibration certificate issued; thread model does not meet the requirements of the regulations issued
Give notice of test results, and indicate the failed project.
7.5 test cycle
Thread model verification period is determined based on actual usage, generally no more than 2 years.
Appendix A
Common thread pitch deviation measurement model Evaluation of Uncertainty
A.1 Overview
A model to measure the common thread pitch P in the universal tool microscope is 6.00mm, for example, be the common thread
Model pitch deviation measurement uncertainty evaluation and measurement tasks to determine measurement procedures and measurement conditions given together
Lattice sexual.
A.2 tasks and objectives of Uncertainty
A.2.1 measurement tasks
Measuring task is to measure the pitch P is the common thread pitch deviation of 6.00mm template.
A.2.2 Target Uncertainty
P = 6.00mm common thread model, U95≤UT, UT = 13MPEV =
3 × 0.020mm = 6.6μm
A.3 principles, methods, procedures and conditions
A.3.1 Measuring principle
Direct measurement.
A.3.2 Measurement
Two teeth type intermediate position, the instrument is shown twice on the value of universal tool microscope aimed at the adjacent intersection of word in meters respectively
The difference (absolute value) and the difference between the nominal pitch, the pitch is the deviation.
A.3.3 Initial measurement program
--- With a universal tool microscope measuring thread model.
A.3.4 Initial measurement conditions
--- Universal tool microscope order requirements of technical specifications;
--- Reading Display resolution 1μm;
--- Laboratory temperature of 20 ℃ ± 5 ℃;
The measured temperature --- threaded model and universal tool microscope difference between less than 1 ℃;
--- The operator is trained and very familiar with the use of universal tool microscope.
A.4 uncertainty sources lists and discussion
Uncertainty lists and discussion Table A.1 pitch deviation measurement sources.
Table A.1 pitch deviation measurement uncertainty components overview and commentary
symbol
Low resolution high resolution
Uncertainty component name Commentary
uEC
Universal tool microscope
Indication error
Universal tool microscope calibrated and demonstrate MPE values conform TECHNOLOGY
Requires surgery
uRR
Ura resolution uRA = 1μm/(2 × 3) = 0.29μm
uRE Repeatability
Repeatability of measurements carried out with a standard deviation
1.5μm
uRR whichever
The larger
Table A.1 (CONTINUED)
symbol
Low resolution high resolution
Uncertainty component name Commentary
uTD temperature difference between the temperature difference is assumed to obey U-shaped distribution
uTA expansion coefficient difference between the assumed expansion coefficient difference obey U-shaped distribution
A.5 first assessment
Description and calculation A.5.1 first evaluation of uncertainty components ---
uEC --- indication error Class B universal tool microscope Evaluation
Error shows universal tool microscope. 1μm 10-5L, press L = 6mm terms,
aEC = 1.06μm
Rectangular distribution (b = 0.6), so the uncertainty component of
uEC = 1.06μm × 0.6 = 0.64μm
uRR --- repeatability/resolution A Class Evaluation
Threaded model repeatable measurements carried out 10 times to obtain a standard deviation of 1.5μm. Take safety factor h = 1,
So the uncertainty component of
uRR = 1.5μm × 1 = 1.5μm
uTD --- universal tool microscope and the temperature difference between the class B thread model assessment
Universal tool microscope and threaded model temperature difference is less than 1 ℃. Assumed to be a linear expansion coefficient α = 11.5 ×
10-6 ℃ -1, then.
aTD = 11.5 × 10-6 ℃ -1 × 6mm × 1 ℃ = 0.07μm (P = 6.00mm)
It is assumed to follow a U-shaped distribution (b = 0.7).
uTD = 0.07μm × 0.7 = 0.05μm (P = 6.00mm)
uTA --- linear expansion coefficient difference between the Class B assessment
Maximum deviation of 20 ℃ 5 ℃. Difference in coefficient of linear expansion is assumed that less than 15%, then.
aTA = 11.5 × 10-6 ℃ -1 × 6mm × 5 ℃ × 15% = 0.052μm (P = 6.00mm)
It is assumed to follow a U-shaped distribution (b = 0.7).
uTA = 0.052μm × 0.7 = 0.04μm (P = 6.00mm)
A.5.2 first assessment of the correlation between the uncertainty components ---
No correlation between the estimated uncertainty components.
A.5.3 first assessment --- combined standard uncertainty and expanded uncertainty
uc = u2EC u2RR u2TD u2TA
A.5.1 After substituting the values, we have.
uc = 0.642 1.52 0.052 0.042μm = 1.64μm
Expanded uncertainty. Take k = 2, then
U = uc × k = 1.64μm × 2 = 3.3μm
Uncertainty estimates A.5.4 first assessment summary
Uncertainty estimates for the first assessment are summarized in Table A.2.
Uncertainty estimates are summarized in Table A.2 (first evaluation)
Component Name
assessment
Types of
distributed
Types of
measuring
frequency
Effect of the amount of a *
unit
Related
coefficient
distributed
factor
uncertainty
uxx/μm
uEC universal tool microscope Indication Error B rectangle 1.06μm 0 0.6 0.64
uRR repeatability A 10 1.5μm 0 1.5
uTD temperature difference between BU-shaped 0.07μm 0 0.7 0.05
uTA expansion coefficient difference BU shaped 0.052μm 0 0.7 0.04
Combined standard uncertainty uc 1.64
Expanded uncertainty (k = 2) U 3.3
A.6 first evaluation conclusions
In the first evaluation, the data given in Table A.2 indicates uncertainty have been met.
U = 3.3μm≤UT (6.6μm)
Similarly, P is the common thread model of 0.50mm.
U = 3.3μm≤UT (3.3μm)
The first assessment indicates that the measurement conditions are qualified, so the measurement method is feasible.
Appendix B
Calibration certificate/test results in the notice page and format
B.1 calibration certificate/test results in the notice page contains the following information.
B.1.1 calibration certificate/test results notice number
B.1.2 The baseline measurement or verification information with measurement standards
B.1.2.1 reference standards of measurement or metering name
B.1.2.2 Measurement Range
B.1.2.3 Uncertainty/accuracy class/maximum permissible error
B.1.2.4 Certificate No.
B.1.2.5 Validity of calibration certificate
B.1.3 test conditions
B.1.3.1 environmental conditions. temperature, relative humidity, etc.
B.1.3.2 Verification Location
B.1.4 subject project and test results
B.1.5 test failed Item Description (only for test results of notice-page format)
B.1.6 Page
There may also be additional instructions section B.1.7
The above information, except B.1.7 selectable items, the rest are prerequisites.
B.2 calibration certificate/test results in the notice page formatting styles
Calibration certificate/test results of notice under section 2
Certificate Number ×××××× - ××××
Institutes authorized instructions
Verification of environmental conditions and place.
Location temperature ℃
Relative humidity% Other
Verification of measurement (group) using standard device
Name Measurement Range
Uncertainty/accurate
Grade/Max
Allowable error
Metering (base) standard
Certificate No
valid until
Testing standards used by
Name Measurement Range
Uncertainty/accurate
Grade/Max
Allowable error
Metering (base) standard
Certificate No
valid until
Total page × × Page
B.3 calibration certificate/test results test results page notice Shape
B.3.1 Verification Certificate page 3
Certificate Number ×××××× - ××××
Verification Results
Item number subject test results
1 Appearance
2 portions of interaction
3 Face the surface roughness
4 pitch deviation
5 tooth-type half-width deviation
Test Members. verification of Members.
Blank
Total page × × Page
B.3.2 test results notice under section 3
Certificate Number ×××××× - ××××
Verification Results
No. test results were seized items qualified judge
1 Appearance
2 portions of interaction
3 Face the surface roughness
4 pitch deviation
5 tooth-type half-width deviation
Test Members. verification of Members.
Additional information
Test results indicate nonconformity
Blank
Total page × × Page
twenty one
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