三、冷镦头强度问题冷镦头强度问题比较复杂,影响因素很多,我们从1964年起,陆续对此进行过一些试验和摸索,这是一个应立专题深入研究的问题。本文限于篇幅,只能对一部份试验结果略加叙述。从1977年4月至1977年6月的强度试验结果(原始数据从略)可以看出:27个试件中,有24个断在母材中部,三个断头的也都 Third, the cold head strength problems Cold heading head strength problem is more complicated, a lot of influencing factors, we have been from 1964 onwards, have carried out some tests and groping for this, which is a subject should be in-depth study of the issue. This article is limited to space, only a small part of the test results described. From April 1977 to June 1977 the strength test results (the original data omitted) can be seen: 27 of the test pieces, 24 broken in the middle of the base metal, three are also decapitated