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JB/T 10478-2004Machining allowances and tolerances for rolled rings (English PDF)

热轧环形件机械加工余量及公差

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

October 20, 2004

Implementation date

April 1, 2005

Scope

JB/T 10478-2004 is the English-translated version of 热轧环形件机械加工余量及公差.

JB/T 10478-2004 is the Chinese standard "Machining allowances and tolerances for rolled rings".

Its scope clause reads: This standard specifies the machining allowance and tolerance of hot-rolled rings made of structural steel, tool steel, stainless steel, heat-resistant steel, superalloy, titanium alloy, copper alloy and aluminum alloy through rolling by ring rolling machine.

This standard is applicable to the determination of machining allowance (hereinafter referred to as allowance) and tolerance of hot-rolled rings produced by ring rolling machine, with the maximum outer diameter of not greater than phi5500mm, the minimum inner diameter of not less than 1/2 of the maximum outer diameter and the maximum height of not greater than 700mm. Its clauses include terms and definitions.

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Document preview — JB/T 10478-2004

National Standard of the People's Republic of China

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
4.1 Shape classification of hot-rolled rings
4.2 Material factor
4.3 Wall thickness factor
4.4 Shape complexity factor
4.5 Allowance and tolerance
4.6 Geometric tolerance
5 Allowance and tolerance
Annex A (Informative) Use of machining allowance & tolerance

1 Scope

This standard specifies the machining allowance and tolerance of hot-rolled rings made of structural steel, tool steel, stainless steel, heat-resistant steel, superalloy, titanium alloy, copper alloy and aluminum alloy through rolling by ring rolling machine.

2 Normative references

The following standard contains provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.

GB/T 8541 Terminology of forging and stamping

3 Terms and definitions

For the purposes of this standard, the terms and definitions given in GB/T 8541 as well as the following apply.

3.1 hot-rolled ring

ring forging through hot rolling by the ring rolling machine specially for ring rolling

3.2 excess metal

metal added between some steps or transitions of hot-rolled ring to meet the needs of hot-rolled ring rolling process and simplify the sectional shape of hot-rolled ring, as shown in Figure 1 […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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