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一、前言我厂是专业生产金属切削刀具的制造厂,其中φ3～φ13毫米直柄麻花钻头是我厂主要产品之一,属大批量生产,每年还有相当数量的产品出口创汇。为了提高产品质量,贯彻ISO国际标准,这对关键工序——钻头外圆的无心磨削提出了新的要求。从φ3～φ13毫米直柄麻花钻头外径公差,现行国家标准GB与国际标准ISO对比来看(表1),例如:>φ3～φ6毫米直柄麻花钻头外径公差值GB标准为0.030毫米,ISO标准为0.018毫米,ISO标准比GB标准压缩0.012毫米。
I. Preface Our factory is specialized in the manufacture of metal cutting tools, of which φ3 ~ φ13 mm straight shank twist drill is one of our main products, is a mass production, there are a considerable number of annual export earnings. In order to improve product quality and carry out ISO international standards, this puts forward new requirements on the key process - the centerless grinding of the drill bit. From φ3 ~ φ13 mm straight shank twist drill OD tolerance, the current national standard GB and ISO international standard comparison (Table 1), for example:> φ3 ~ φ6 mm straight shank twist drill OD tolerance standard GB of 0.030 mm , ISO standard is 0.018 millimeter, ISO standard is compressed 0.012 millimeter than GB standard.