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Friction drilling
Friction drilling is a method of making holes in metal in which the material is pushed out of the way with the aid of heat from friction. The process is also called thermal drilling, flow drilling, form drilling, or friction stir drilling.
Friction drilling is commonly used on bicycle frames, heat exchangers, and to create holes for mounting bearings.
==History==
In 1923, the Frenchman Jean Claude de Valière tried making a tool that could make holes in metal by friction heat, instead of by machining. It was only a moderate success, because at that time the right materials were not yet available. Moreover, he hadn't yet discovered the right shape for this kind of tool.
It was not until the 1980s that a useful tool could be produced.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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