電気通信大学明・佐藤研究室

Top/Gear measuring instrument

Research and development of robot for gear measuring ‌

　A gear is a mechanical element that transmits power. Therefore, efficient transmission is required. Most of the gears currently used are called involute tooth profiles, and the tooth profiles are involute curves. By using an involute curve, the meshing position of the gear and the rotation angle become proportional connection, and the direction of force is constant. There is always an error in what humans make. Even gears, the tooth profile of actual gears have errors in comparison to the theoretical involute curve. This error is called “tooth profile error”. It is better that the gear has less tooth profile. Currently, various types of gear accuracy measuring machines is used for geometrical shape and measure of the gear, that is, measuring tooth profile error and total helix error, and an international standard that classifies gear accuracy according to the size of the shape error exist. However, there is problems that international guarantee system of measured value is not established and measuring that cannot perfectly satisfy accuracy of determination for classification. In order to solve the problem, the development of Japan gear Manufacturers Association take the lead to develop higher accuracy measuring machine and research testing system for measured value. 　　　

Research and development of ultra-high-precision gear measuring equipment ‌

　At present, the Japan Gear Industry Association has developed an NC-type ultra-high precision gear measuring machine for the purpose of establishing a tooth profile accuracy verification method. This measuring machine currently has 1 μm error for measuring all tooth profile errors. This uncertainty is still insufficient to evaluate all gears in the JIS gear standard. Important element of measurement error for the measuring instrument is motion error of drive system, namely, stepping motor, worm gearing and ball screw caused error has been confirmed for the research so far. For the problem, by developing servo system used new drive system of DD system supported air bearing, ultra-high-precision gear measuring equipment were developed. In this study, we are developing a control method for aiming at more accurate measurement using this DD type gear measuring machine. The measuring machine has two shafts: a rotating shaft (cylindrical) on which the gear of the object to be measured is placed and a linear motion shaft. This is a gear accuracy measuring machine that uses NC control (numerical control) and synchronize the two axes, the rotation of the spindle and the linear movement of the probe, in the relation of the theoretical formula of the tooth surface. 　　

Research and development of general gear measuring equipment ‌

　This research started with the opinion that it was necessary to develop a general-purpose measuring device that is equivalent to the accuracy of conventional gear measuring machines, and that had excellent operational convenience such as installation location and workpiece mounting. A multi-joint mechanism is assumed to be used for faster and more versatile measurement than conventional cartesian coordinate system machines, and this mechanism aims to combine the world's highest standard of uncertainty of less than 1 μm.Currently, we are collaborating with Osaka Precision Machinery Co., Ltd. to evaluate the performance of industrial SCARA robots.