51吃瓜

???? ????? ??? ??? ???? ?? ????? ???? ???? ?? ????? ?? ??? ??? ????? ?? ?? ?? ???? ???? ?? ????? ?? ??? ????? ???? ??? ???? ????? ????? ?? ?? ?????? ?? ??????? ?? ??? ???? ???? ???: 1. ???????? ??? ???? ???? ?? ??? ??????? ??? ???: ???? ?????? ????????? ????????? ?? ????? ???? ?????? ?? ???? ????? ?? ????? ???? ?? ???? ?????? ?? ????? ??? ?????? ????? ?? ?????? ??? ?????? ???? ????? ?? ?? ???? ???? ????? ?? ?? ?????? ??? ???? ???? ?????? ?? ??????? ???? ?????? ?? ???? ???????? ??????? ??? ???? ?????. ???? ??? ??????: ???? ????? ???????? ???????? ??? ??? ?????? ?? ???? ????? ????? ???? ??. ????? ???????? ??? ???? ?????? ?? optimization ?? ?????? ??? ?? ??? ???? ??? ???? ????? ?? ???? ??? ???? ??? ???? ???. ?? ??? ?? ???? ??? ?? ?????? ??? ??? ??? ?? ?????? ??? ???? ???????? ????????? ??? ????? ??????. 2. ???? ????? ??? ????? ??????: ????? ??????? ????????? ?? ??? ??? ????? ?????? ?? ??? ?? ????? ???? ??? ???? ????????? ?? ???? ??? ????? ?? ?? ????? ???? ?????? ??? ???? ?? ????????? ?? ???? ????? ?? ?????? ????? ???? ??? ?????? ?? ????? ?? ????? ????? ????? ?? ???????? ?? ????? ???? ??. Multi process combination: The precision machining process involves various processes such as turning, milling, drilling, gear cutting, grinding, as well as special processes such as heat treatment, such as carburizing, quencing, tempering etc. ?? ?????? ?? ????? ?? ?? ????? ????? ???? ?? ?? ???? ????? ?? ????? ?????? ??? ???? ???? ??? 3? ???? ?????? ????????? ??? ???: ????????? ??? ??? ???????? ?? ????? ??? ???? ????? ???????? ???????? ?? ????????? ??? ??? ?? ??? ???? ?? ???? ?? ??. ????? ?????? ????????? ?? ?????? ??????? ??????? ????????? ??? ????? ????? ??? ????? ?? ????? ?????? ??? optimization ?? ????? ???? ?? ???? ???? ????? ?? ????? ????? ??? ????? ?? ????? ?? ?? ???? ??? ??? ????? ??? ???? ?????? ?????: ???? ?????? ????????? ????????? ?? ????? ??????? ?? ???? ????? ???? ??? ???? ?????? ????? ?? ???? ?? ???? ??. ?? ?????? ????? ??? ??? ?? ???? ??? ?? ?? ???? ???? ?? ?? ????? ??? ??? ?? ???? ??. ?????? ????? ?????? ???? ?????? ??? ????? ????? ???? ?? ???? ???? ??????? ?? ????? ?? ???? ?? ?????? ?? ????? ?????. 4 ? "??? ???? ???? ?????? ?????? ??? ????????? ????? ?? ??? ???? ??: ???? ????? ????? ???????? ?? ?????? ??? ???? ????? ?? ????? ?? ???? ??. ????? ????? ?? ??????? ??? ???? ????? ?? ?????? ???? ???? ?? ??? ?????? ??? ????????? ????? Material conservation: Precision machining technology can reduce the waste of raw materials. Although engineering and manufacturing industries are expected to generate a certain degree of waste, the application of precision machining will greatly reduce waste, significantly save manufacturing costs, protect the environment, and maximize the use of expensive materials. 5? ??? ????? ??????? ????? ???? ???: ???? ?????? ????????? ?? ?????? ????? ??? ????? ?? ??? ??? ???? ??? ??? ????? ?? ?????? ??? ??? ???? ??. ????? ????????? ?? ????? ??? ??????? ?? ????? ?? ??? ???? ????? ???? ???? ?? ??? ??? ??????? ?? ???? ??? ??? ??? ???? ??. ???????? ????: ??? ?????? ???? ???? ?? ????? ???? ?? ???? ????? ??? ????? ???? ???? ?? ????? ??? ?? ??? ??? ????? ?? ???? ???? ?? ????? "??? ?????" ?? ????? ???? ????? ??? ????? ???? ????? ?? ????? ???? ???? ????? ?? ????: ???? ??? ????? ???? ???? ????? ?? ???? ??? ???? ????? ?? ????? ????? ?? ?? ???? ???? ???? ??? ???? ?????? ??????? ??????? ??? ????? ??????? ?? ????? ????? ??. ??? ????? ?? ??? ???? ???? ?? ????? ??: ????? ???? ?? ???? ?? ??? ??????????? ??? ????? ??? ???? ?? ????? ??? ??? ????? ?? ????? ??????? defects ?? ????? ???? ??. precision measurement: precision measurement is a necessary condition for precision machining and ultra precision machining. ??? ?? ?????? ????? ?? ????? ???? ?? ???? ????? ???? ?? ??????? ???? ?? ???? ???? ???? ?? ??? ???? ??.