BS 7900-1998 精加工钢铸件表面结构检验规范

标准号：BS 7900-1998
中文标准名称：精加工钢铸件表面结构检验规范
英文标准名称：Specification for examination of the surface texture of precision steel castings
标准类型：J31
发布日期：1998/5/15 12:00:00
实施日期：1998/5/15 12:00:00
中国标准分类号：J31
国际标准分类号：77.140.80
适用范围：This British Standard specifies levels of surface roughness/texture on steel castings produced by the resin shell, lost wax, lost polystyrene and Shaw moulding processes (see 2.5 to 2.8 for a brief description of each process). Surfaces created by subsequent fettling operations (see 2.4) are also included. In addition to the definitive requirements, this standard also requires the items detailed in clause 4 to be documented. For compliance with this standard, both the definitive requirements and the documented items have to be satisfied. NOTE. Acceptance levels should be agreed between the casting producer and purchaser by reference to a set of reference tactile comparators which represent the surfaces produced by the four moulding processes after blasting, and also, surfaces created by subsequent fettling operations. Annex A contains full size photographs of the comparator plates to assist in making a rapid review of the overall content of the set. It is emphasized, however, that the comparators and not the photographs should be used to form the basis of agreement