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JJG 831-2021 English PDF

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Q: Should I purchase the latest version JJG 831-2021?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 831-2021 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.

US$399.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJG 831-2021: Verification Regulation of Hardness Testers for Casting Moulds of Sand
Status: Valid

JJG 831: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 831-2021	399	Add to Cart	4 days	Verification Regulation of Hardness Testers for Casting Moulds of Sand	Valid
JJG 831-1993	279	Add to Cart	3 days	Verification regultion of green sand mould surface hardness tester for castings	Obsolete

Similar standards

GB/T 36126 JJG 797 GB/T 1885 JJG 159 JJG 166 JJG 126

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:)

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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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJG 831-2021_English be delivered?

Answer: Upon your order, we will start to translate JJG 831-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJG 831-2021_English with my colleagues?

Answer: Yes. The purchased PDF of JJG 831-2021_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version JJG 831-2021?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 831-2021 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.