Mechanism of Type II chip formation in slow-speed orthogonal cutting of wood along the grain

杉木、扁木、makanba和honoki的工件采用刀具沿晶粒垂直切削，切削角度为30-90度，切屑未变形厚度为0.05-0.5 mm，切削速度为10 mm/s。高速视频显微镜记录的晶片形成和高分辨率x射线扫描仪对晶片的CT图像清楚地显示了II型晶片形成的切割角度和晶片厚度的组合以及II型和III型晶片之间的边界，这两种晶片在日本被称为CHIJIMI-GATA。研究了数字图像相关技术在电影中测量切削应变的应用。

Workpieces of sugi, hinoki, makanba and honoki were orthogonally cut along the grain using tools with cutting angles of 30-90 degrees at undeformed chip thicknesses of 0.05-0.5 mm and a cutting speed of 10 mm/s. Movies of chip formation recorded with a high-speed video microscope and CT images of chips with a high-resolution X-ray scanner clearly showed the combinations of cutting angle and chip thickness for Type II chip formation and the boundaries between Types II and III chips, which are together called CHIJIMI-GATA in Japan. The application of digital image correlation to movies was also examined to measure cutting strains.