CUTTING FORCES IN HIGH SPEED TAPPING CAST IRON BY TUNGSTEN CARBIDE TAPS  

硬质合金丝锥在铸铁高速攻丝中的切削力分析(英文)

作　　者：张晓辉[1] 刘钢[1] 陈明[1] 胡祖光[2] 励政伟 许辉 祝新发 

机构地区：[1]上海交通大学机械与动力工程学院 [2]上海工具厂有限公司

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2007年第2期94-99,共6页南京航空航天大学学报（英文版）

基　　金：国家自然科学基金(50675134)资助项目;国家科技型中小企业技术创新基金(04C26213101122)资助项目;新世纪优秀人才支持计划(NCET-04-0384)资助项目~~

摘　　要：The engineblock production lines need high speed tapping with tungsten carbide taps. In the tapping process, the machining precision and the tool life of taps are directly influenced by tapping forces. And the parameter optimization of tap structures is also correlated with the variation of tapping forces. Therefore, the study of tapping forces is necessary in developing new style taps. Several experiments about some novel carbide taps are performed on a vertical machining center by a Kistler dynamometer system in blind tapping both gray cast iron and ductile cast iron. And the variations of tapping forces are analyzed in tapping-in and tapping-out periods. It indicates that cutting forces hardly vary with the tap wear in tapping cast iron. Contrarily, tapping forces are closely correlated with the holding method. Besides, it also depends on the helix angle, the flute numbers and the plasticity of the work material to some extent.发动机汽缸生产线上需求大量的高速加工用硬质合金丝锥。攻丝过程中,由于切削力的大小直接影响了加工精度及丝锥寿命,丝锥的参数优化也与切削力变化紧密相关,因此切削力分析在新型硬质合金丝锥的研制过程中显得尤为重要。通过立式加工中心和Kistler测力系统,对一批新型丝锥进行了切削性能评价,比较了不同的硬质合金丝锥加工灰铸铁和球墨铸铁过程中的切削力在旋入和旋出两个阶段的变化情况。指出了在铸铁攻丝中切削力的变化几乎不受丝锥磨损的影响,而与刀具夹持方式紧密相关。此外,攻丝力还与螺旋角、丝锥槽数以及试件材料的塑性均有不同程度的联系。

关 键 词：tungsten carbide tap cast iron high speed tapping tapping force 

分 类 号：TG506.1[金属学及工艺—金属切削加工及机床] TG62