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凡是精度和表面貭量要求較高的机器零件,必需经过最后的机械加工。因此,机械加工工艺在整个机械制造工业中,占有很大的比重。在目前的实践中,机械加工的工作量約占机械制造过程全部工作量的一半。由此可見,这方面工作的完善化,具有十分重大的国民經济意义。毫无疑问,精密鑄造和精密模鍛等新工艺方法,应当大力研究和推广,以便尽量減小毛坯的机械加工余量,节省金属,而且对于精度和表面貭量要求較低的零件,甚至可以免去随后的机械加工。但这絕不意味着可以完全取消机械加工,因为精密鑄造或精密模鍛实际上有其一定的工艺指标、应用范围和限度。应当发挥各种工业方法的优点,才能收到最高的效果。我国在1957年党領导的整风运动中,彻底批判了“切
Any machine parts that require higher precision and surface quality must undergo the final machining. Therefore, the machining process in the entire machinery manufacturing industry, occupy a large proportion. In current practice, the machining workload accounts for about half of the total workload of a machine manufacturing process. From this we can see that the perfection of this work has a very significant national economic significance. There is no doubt that the new process methods such as precision casting and precision forging should be vigorously studied and promoted in order to minimize the machining allowance of the blank and save the metal, and even for the parts with lower requirements on accuracy and surface sizing, Remove the subsequent machining. However, this in no way means that the machining can be completely eliminated, because precision casting or precision die forging actually has certain technical specifications, application ranges and limits. The best of various industrial methods should be brought into play to receive the highest results. In the rectification movement led by the party in 1957, China completely criticized the "cut