TOOL HOLDER AND TOOL-FIXING METHOD USING A SHAPE MEMORY ALLOY

摘要

Provided are a tool holder and a tool-fixing method using a shape memory alloy. The tool holder for fixing a tool comprises: a tool-mounting unit having a tool-fixing hole penetrating therethrough, wherein the tool-fixing hole has an inner diameter that is relatively smaller than the outer diameter of a shank unit of the tool; and at least one shape memory alloy ring inserted into a ring-fixing hole formed through the tool-mounting unit such that the ring-fixing hole has an inner diameter that is relatively larger than the tool-fixing hole. The size of the inner diameter of the tool-fixing hole forcibly varies by means of the transformation of the shape memory alloy ring caused by a heating source and a cooling source provided in the shape memory alloy ring, so as to clamp or unclamp the tool.