CAJ | 학술논문

深入研究锯齿形切屑的形成过程及表征有利于工业生产中的切屑控制。用锯齿频率、锯齿化程度及绝热剪切带间距来对锯齿形切屑进行表征。鉴于Ti6Al4V在加工过程中易于形成锯齿形切屑，因此选择Ti6Al4V作为工件材料，通过高速切削Ti6Al4V实验，收集不同切削速度和每齿进给量下的锯齿形切屑；将获得的锯齿形切屑进行抛磨及腐蚀后，在VHX-600 ESO数码显微镜下观察切屑形貌，计算不同切削条件下锯齿频率、锯齿化程度及绝热剪切带间距。结果表明：随着切削速度的提高，锯齿频率及锯齿化程度增大，绝热剪切带间距减小；随着每齿进给量的增大，锯齿频率减小，锯齿化程度及绝热剪切带间距增大。锯齿化程度可以作为普通切削、高速切削及超高速切削的判据。
심입연구거치형절설적형성과정급표정유리우공업생산중적절설공제。용거치빈솔、거치화정도급절열전절대간거래대거치형절설진행표정。감우Ti6Al4V재가공과정중역우형성거치형절설，인차선택Ti6Al4V작위공건재료，통과고속절삭Ti6Al4V실험，수집불동절삭속도화매치진급량하적거치형절설；장획득적거치형절설진행포마급부식후，재VHX-600 ESO수마현미경하관찰절설형모，계산불동절삭조건하거치빈솔、거치화정도급절열전절대간거。결과표명：수착절삭속도적제고，거치빈솔급거치화정도증대，절열전절대간거감소；수착매치진급량적증대，거치빈솔감소，거치화정도급절열전절대간거증대。거치화정도가이작위보통절삭、고속절삭급초고속절삭적판거。
A deep understanding of the generation and characteristics of serrated chip formation can obtain some practical advices of control ing this type chip in engineering applications.The characteristics of serrated chip including the frequency of serration,the degree of segmentation and the space of adiabatic shear band are comprehensively investigated in this paper.Experi-ments of high speed mil ing Ti6Al4V were performed.The investigated material is Ti6Al4V since it is prone to form serrated chip in machining process.The chips of Ti6Al4V under different cutting speeds and feed per tooth were col ected during machining.After inlay and polishing process for the col ected chips,the chip morphology could be observed by VHX-600 ESO digital microscope. The expressions of the frequency of serration,the degree of segmentation and the space of adia-batic shear band were determined through microcosmic observation.The results show that the space of adiabatic shear band gets decreased with the increase of cutting speed and the feed per tooth.On the contrary,the frequency of serration wil get increased with the increase of the cut-ting speed and it wil get decreased with the increase of the feed per tooth.The increase of cut-ting speed or the feed per tooth could intensify the degree of chip segmentation.The degree of segmentation can be used as the criterion of ordinary cutting,high speed cutting and ultra high speed cutting.