推荐回答（1个）
这篇文章是下不出来的，主要原因是年代过于久远，并且NASA的文章一般不可以直接下载的，这篇文章的信息如下：
Title: Cold-form tapping of internal threads
Authors: Trendler, P. H. H.
Affiliation: AA(Council for Scientific and Industrial Research, Pretoria (South Africa).)
Publication: In its Mini-Seminar on Joining Tech. 10 p (SEE N84-18431 09-31)
Publication Date: 08/1982
Category: Engineering (General)
Origin: STI
NASA/STI Keywords: Cold Working, Drilling, Machining, Metal Cutting, Threads, Aluminum, Lubricants, Manufacturing, Performance Tests, Stainless Steels
Abstract
An alternative to conventional tapping, cold-form tapping differs from conventional tapping in that it is a forming rather than a cutting process. The cold-form tapping is chipless since the thread is generated by a succession of deeper penetrating lobes on the tapered end of the tap. The thread is formed as the displaced material is pushed together axially between the lobes when the tap rotates into the hole. The results of comparative performance tests using various tap geometries, workpiece materials, and lubricants are presented.
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