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JJG 831-2021: Verification Regulation of Hardness Testers for Casting Moulds of Sand
Status: Valid JJG 831: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 831-2021 | English | 399 |
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Verification Regulation of Hardness Testers for Casting Moulds of Sand
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JJG 831-2021
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| JJG 831-1993 | English | 279 |
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Verification regultion of green sand mould surface hardness tester for castings
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JJG 831-1993
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Basic data | Standard ID | JJG 831-2021 (JJG831-2021) | | Description (Translated English) | Verification Regulation of Hardness Testers for Casting Moulds of Sand | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A53 | | Classification of International Standard | 17.100 | | Word Count Estimation | 18,124 | | Date of Issue | 2021-12-28 | | Date of Implementation | 2022-06-28 | | Issuing agency(ies) | State Administration for Market Regulation | | Summary | This standard applies to the initial verification, follow-up verification and in-use inspection of sand mold hardness testers for casting that are hand-held or equipped with fixed brackets. | JJG 831-2021: Verification Regulation of Hardness Testers for Casting Moulds of Sand---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.
National Metrology Verification Regulations of the People's Republic of China
Sand mold hardness tester for foundry
Released on 2021-12-28
2022-06-28 Implementation
Released by the State Administration for Market Regulation
Verification rules for sand mold hardness tester for foundry
Replace JJG 831-1993
Responsible unit: National Technical Committee of Force, Hardness and Gravity Measurement
Main drafting unit: Guangdong Institute of Metrology
Hebei Institute of Metrology Supervision and Testing
Zhongshan Quality Metrology Supervision and Inspection Institute
Liaoning Institute of Metrology
Participating in the drafting unit: China Institute of Metrology
Wuxi Sanfeng Instrument Equipment Co:, Ltd:
This regulation entrusts the National Force Value Hardness Gravity Measurement Technical Committee to be responsible for the interpretation
The main drafters of this regulation:
He Guanglin (Guangdong Institute of Metrology)
Wang Xiaozhong (Hebei Institute of Metrology Supervision and Testing)
Mai Weiming (Zhongshan Quality Metrology Supervision and Testing Institute)
Liu Wei (Liaoning Institute of Metrology)
Participating drafters:
Ye Ming (National Institute of Metrology)
Branch in one (Wuxi Sanfeng Instrument Equipment Co:, Ltd:)
Table of contents
Introduction (Ⅱ)
1 Scope(1)
2 References(1)
3 Overview(1)
4 Metrological performance requirements (3)
4:1 Protrusion length of indenter(3)
4:2 Measuring indicating mechanism(3)
4:3 Appearance and parameters of indenter (3)
4:4 Spring test force (3)
5 General technical requirements (3)
5:1 Appearance(3)
5:2 Indicating bodies(3)
5:3 Spindle measuring rod (3)
6 Measuring Instrument Control(3)
6:1 Environmental conditions (3)
6:2 Apparatus for testing (4)
6:3 Verification items (4)
6:4 Verification method (4)
6:5 Test result processing (6)
6:6 Verification cycle (6)
Appendix A Foundry Sand Mold Hardness Tester Verification Record Format (7)
Appendix B Format of the inner page of the verification certificate of the foundry sand mold hardness tester (9)
Appendix C Format of the inner page of the notification of the verification result of the foundry sand mold hardness tester (11)
Introduction
This procedure is drafted in accordance with JJF1002-2010 "Rules for Compilation of National Metrology Verification Regulations":
This regulation replaces JJG 831-1993 "Wet Surface Hardness Tester for Foundry": Compared with JJG 831-1993, this regulation
The main technical changes in the regulations are as follows:
---The name of the regulation is changed from "Wet Mold Surface Hardness Tester for Foundry" to "Sand Mold Hardness Tester for Foundry":
Increase HCSd, HCSg, etc: scales with range;
--- Change the test force tolerance from a relative value to an absolute value (see 6:4:7):
The release status of previous versions of this regulation:
---JJG 831-1993:
Verification rules for sand mold hardness tester for foundry
1 Scope
This regulation applies to the initial verification, follow-up verification and use of sand mold hardness testers for casting that are hand-held or equipped with fixed brackets:
Check in use:
2 References
This regulation refers to the following documents:
JJG 144 Standard force measuring instrument
GB/T 4340:1 Vickers hardness test for metallic materials - Part 1: Test method
For dated references, only the dated version applies to this regulation; for undated references
document, its latest version (including all amendments) applies to this regulation:
3 Overview
The sand mold hardness tester for foundry (hereinafter referred to as the hardness tester) is used to measure the hardness of various castings when sand molds are formed:
It is mainly composed of pressure head, spring and indicating mechanism: The principle of the test is to place a certain shape of the indenter on the spring
Under the action of the test force, with 0:025mm as a hardness unit, press into the sand mold and make the presser foot close to the surface of the tested sample,
The indicating mechanism displays its measurement results: Check the compactness of the foundry sand mold by hardness value:
The relationship between the protruding length of the indenter and the indicated value of the hardness tester should meet the requirements of formula (1):
HCS=100-
0:025
(1)
In the formula:
HCS---casting sand mold hardness;
L --- the extension length of the indenter, mm:
There are five scales for the shape of the pressing head and the test force: HCSa, HCSb, HCSc, HCSd, and HCSg: parameter
See Table 1 and Table 2:
Table 1 Geometric parameters and applicable categories of indenter
Applicable categories of hardness scale graphic geometric parameters
HCSa
SR (2:5±0:1)mm
L (2:5±0:04)mm
fine sand: high density, low strength
casting mold
HCSb
SR (12:7±0:2)mm
L (2:5±0:04)mm
coarse sand: low density, high
strength casting mold
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