标准编号:	GB/T 5766-1996
中文名称:	摩擦材料洛氏硬度试验方法
英文名称:	Test method of Rockwell Hardness for Friction Materials
行业分类:	GB    国家标准
发布机构:	中华人民共和国国家质量监督检验检疫总局 中国国家标准化管理委员会
发布日期:	1996-3-27
实施日期:	1999-12-1
标准状态:	superseded
被新标准替代:	GB/T 5766-2007 摩擦材料洛氏硬度试验方法
被替代日期:	2008-6-1
替代旧标准:	GB 5766-1986 摩擦材料洛氏硬度测定法
翻译语言:	英文
文件格式:	PDF

1 Subject Content and Application Scope This standard specifies test methods of Rockwell hardness for friction materials. This standard is applicable to dry type friction material products; and not applicable to powder metallurgical friction material products. 2 Normative References GB 8170 Rules for Rounding Off of Numerical Values JJG 884 Verification Regulation of Plastic Rock Well Hardness Testing Machine 3 Terms and Definitions 3.1 Rockwell hardness Under the specified conditions, primary and main test forces are respectively applied with specified ball indenter on the surface of friction material products, and the main test force is unloaded, while keeping the primary test force. The residual increment e of pressed depth of the ball indenter under the action of primary test forces for two times is adopted, and it is expressed by 0.002mm. Rockwell hardness HR= 130-e 3.2 Scales The symbol combinations to indicate the Rockwell hardness of steel ball and the test force are detailed in Table 1.