CAJ | 학술논문

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.
발동궤기항생산선상수구대량적고속가공용경질합금사추.공사과정중,유우절삭력적대소직접영향료가공정도급사추수명,사추적삼수우화야여절삭력변화긴밀상관,인차절삭력분석재신형경질합금사추적연제과정중현득우위중요.통과입식가공중심화Kistler측력계통,대일비신형사추진행료절삭성능평개,비교료불동적경질합금사추가공회주철화구묵주철과정중적절삭력재선입화선출량개계단적변화정황.지출료재주철공사중절삭력적변화궤호불수사추마손적영향,이여도구협지방식긴밀상관.차외,공사력환여라선각、사추조수이급시건재료적소성균유불동정도적련계.
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.