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我们QC小组共七人,围绕解决中心钻质量问题于八○年十一月二十日组成并开始活动,先后活动十六次,已取得初步成果。一、问题的提出中心钻虽小,却是机械加工中必不可少的一种刃具。部颁标准只给出中心钻的外形基本尺寸,槽形参数没有给出。实际上槽形参数既影响强度也影响切削性能,各兄弟厂的生产图纸也不统一。我厂多年生产中也曾参照兄弟单位的图纸多次变换槽形参数,如槽形的水平摆角就曾用过2°30′的、5°的等,心厚曾用过0.55、0.69的。由于中心钻
A total of seven members of our QC team formed and started activities on solving the drilling quality problems of the center on November 20, 1980 and have conducted 16 activities and achieved initial success. First, the problem raised Center drills are small, but it is an essential tool in machining. The ministerial standards only give the basic dimensions of the center drill, groove parameters are not given. In fact, the channel parameters affect not only the strength but also the cutting performance. The production drawings of the brothers’ factories are also not uniform. I plant many years production has also referred to the brothers unit drawings repeatedly change the channel parameters, such as the horizontal groove angle swing angle had used 2 ° 30 ’, 5 ° and so on, the heart had used 0.55,0.69 . Because of the center drill