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The scrap technology is considered as the fundamental of the accuracy of precision machine tools. According to the maternal principle, the accuracy of components which were fabricated by a machine tool is lower than that of the machine itself. The products of a machine, which was assembled by using the products of the first generation of machine, will have the accumulated tolerance. Up to now, the history of the development of machine tools is over 200 years, the accumulated tolerance was not obvious. The scarp technology plays an important role. So far the carp technology was operated manually and the procedure is very complicate and time consuming. In this paper, a mechanism is designed to replace the manually carping.
A rotary type automatic scraping mechanism is presented in this research. Papers and patents are surveyed and analyzed firstly. Several trips to visit experienced scrapping master are also arranged. The PRO ENGINEERING software is used to build the solid modeling of a scrapping mechanism. The motion programming, dynamic simulation, and scrapping force analysis are carried out by using the finite element analysis package VISUAL NASTRAN. After several modifications a final design of a rotary type scrapping mechanism is set and fabricated. After testing and adjusting, the best operating parameters of the scrapping mechanism are obtained. The scarping sample is compared with the one which was made manually. The depth of the scratch is deep enough to hold the oil. The rotary type automatic scraping mechanism presented in this study is with many advantages, such as more efficient, low cost, simple assembling and easy control. It is believed that this study is helpful for the automation of scrap technology.