Standard No.:	JB/T 7699-1995
English Name:	Technical Specifications for Wooden Model and Core Box for Foundry
Chinese Name:	铸造用木制模样和芯盒 技术条件
Chinese Classification:	J31    Casting
Professional Classification:	JB    Professional Standard - Machinery
Issued by:	全国铸造标准化技术委员会
Issued on:	1995-6-20
Implemented on:	1996-1-1
Status:	superseded
Superseded by:	JB/T 7699-2022
Superseded on:	2022-10-1
Superseding:	JB/Z 85-1965
Language:	English
File Format:	PDF
Word Count:	4000 words
Price(USD):	120.0
Delivery:	via email in 1 business day

Technical specifications for wooden pattern and core box for foundry 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:

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)