抄録
This paper investigates how to use cylindrical shape memory alloy (SMA) as chucking part because tool holder can be simplified and miniaturized. Ni-Ti alloy for SMA was used and its critical point by changing heat treatment conditions were experimented. SMA cannot be utilized as chucking tool since it is one-way direction, but it is possible to attach and take off a tool by changing temperature in case cylindrical SMA is made combing cylinder with carbon steel (S30C in JIS). Tensile stress and torsional stress whether it can resist cutting force in real cutting or not was experimented. As a result of this study, it is clear that combing cylinder with cylindrical SMA could resist cutting force in real cutting. Therefore, prototype tool holder that used combing cylinder with cylindrical SMA as chucking part was developed and tried real cutting process.
