Abstract
Drill breakage is one of the major problems in small hole drilling. Therefore, real time breakage prediction can improve production reliability remarkably. To predict drill breakage, this paper describes an in-process non-contact measurement of small cutting torque acting on micro drill. A thin-walled elastic cylinder is divided into three parts by two parallel slits. The top cylinder is connected to the middle with a small beam and the middle cylinder is also connected the bottom with a small beam at the opposite side of the top. The middle cylinder is push out to radial direction when torque is applied at the end of the top or bottom cylinder. By measuring this radial eccentricity of the middle cylinder with non-contact displacement sensor, this torque can be detected. Torque detection spindle, which has the thin-walled elastic cylinder and two displacement sensors at the drill chuck, was developed. It is proved that small cutting torque less than 0.1Ncm can be measured by this technique through small hole drilling on some materials at high speed.
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