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JB/T 7699-1995Wooden patterns and core boxes for foundry - Technical specifications (English PDF)

铸造用木制模样和芯盒技术条件

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

June 20, 1995

Implementation date

January 1, 1996

Scope

JB/T 7699-1995 is the English-translated version of 铸造用木制模样和芯盒技术条件.

JB/T 7699-1995 is the Chinese standard "Wooden patterns and core boxes for foundry - Technical specifications". Its scope clause reads: This standard specifies the grades, technical requirements, acceptance rules, markings and storage of wooden patterns and core boxes for sand casting process.

This standard is applicable to wooden patterns and core boxes for sand casting process, and also to mixed patterns and core boxes of wood and metal. Its clauses include subject content and applicable scope; terms; grade of pattern and core box.

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Document preview — JB/T 7699-1995

National Standard of the People's Republic of China

Replacing: JB/Z 85-1965

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

Foreword i
1 Subject content and applicable scope
2 Normative references
3 Terms
4 Grade of pattern and core box
5 Technical requirement
6 Painting
7 Acceptance rules
8 Marking and storage
Annex A Splicing, overlap joint, rim folding and thick-opening fillet structure (Supplement)

1 Subject content and applicable scope

This standard specifies the grades, technical requirements, acceptance rules, markings and storage of wooden patterns and core boxes for sand casting process.

This standard is applicable to wooden patterns and core boxes for sand casting process, and also to mixed patterns and core boxes of wood and metal.

2 Normative references

GB 153.1 Coniferous sawn timber — Species tolerance

GB 153.2 Coniferous sawn timber — Grading

GB 4817.1 Broad leaves sawn timber — Species, Sizes, Tolerance

GB 4817.2 Broad leaves sawn timber — Grading

GB 5611 Foundry terminology

GB/T 11350 Machining allowances on castings

GB 12472 Surface roughness parameters and their values for wooden pieces

GB/T 14495 Roughness comparison specimens for wooden pieces

JB/T 5105 Casting form — Pattern draft

JB/T 5106 Calculation method of castings material consumption process quota

3 Terms

3.1 measurement dimension

sum of the basic dimensions of parts, machining allowance on castings, shrinkage margin of castings, other process allowance, and casting form pattern draft on the casting process drawing, as well as that dimension of the core print

3.2 flatness tolerance

maximum distance allowed between the working plane and the ideal plane of the pattern and core box

3.3 coincident dimension tolerance

tolerance of overlapping dimension of parting line or parting of core box

3.4 dimension tolerance of tooling

only the dimension tolerance of pattern and core box, which includes the sand box and pattern mounting plate for manual molding and universal molding machine

3.5 unspecified dimension tolerance

dimension tolerance other than center distance tolerance, fit dimension tolerance, overlapping dimension tolerance, wall thickness tolerance, process equipment dimension tolerance

3.6 universal molding machine

molding machine which, if used for molding, does not require the sand box to be equipped with limit and slide and requires the side wall of the sand box not to be provided with box structure except the lifting shaft

4 Grade of pattern and core box

In accordance with the number of uses of pattern and core box and different requirements for the castings’ accuracy, it can be classified into the following three grades.

4.1 Grade I pattern and core box

It is applicable to any of the following situations:

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

Similar standards

GB/T 12464-2016|GB/T 18925-2016

Editions of JB/T 7699

Edition	Title	Revision	Status
JB/T 7699-1995	Wooden patterns and core boxes for foundry - Technical specifications	current edition	Current
JB/Z 85-1965	Wooden patterns and core boxes for foundry - Technical specifications	previous edition	Superseded

This page sells the current edition, JB/T 7699-1995. Earlier editions are listed for reference only.

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