一、问题的提出 212缸套是我厂缸套分厂的主要产品,年产量近45万只,毛坯产量高达56万只之多。 机加工第一道工序是粗车外圆,采用设备为多半自动车床C7─1。多年来,因为设备超期服役,按工艺尺寸加工,保证不了生产定额,影响分厂生产任务的完成,按生产定额干,工艺尺寸却又难以保证。给下面工序的加工带来了很大的困难,也影响了产品质量。如何解决这个矛盾,有人提出更新设备,有人提出再增加一道荒车工序……等等,但实现都比较困难,投资也较大。经过分析研究,我们决定从降低加工余量入手。这项工作从84年10月开始,87年9月大批量投产。 First, the issue put forward 212 cylinder liner factory in our factory is the main product, annual output of nearly 450,000, rough production up to 560,000 as much. The first process is rough machining rough cylindrical, the use of equipment for most of the automatic lathe C7 ─ 1. Over the years, due to over-service equipment, according to process size processing, can not guarantee the production quotas, affecting the completion of production tasks branch, according to the production quota dry, but difficult to guarantee the size of the craft. The process to the following process has brought great difficulties, but also affect the product quality. How to solve this contradiction, some people propose to update the equipment, and some have proposed to add another shortage of car ... ... and so on, but the realization is more difficult and the investment is also greater. After analysis, we decided to start with the reduction of machining allowance. This work began in October 1984 and was put into mass production in September 1987.