GB794-67加强半圆头方颈螺栓(以下简称螺栓)是纺织机上使用量较大的紧固件,全国有五十万台织机,若按每一打棒两只计,使用量就达一百万只。该螺栓在生产中已形成了较成熟的冷镦工艺,但在使用时寿命不高,往往因螺栓断裂而被追停车,直接影响织布的质量和产量。因此,半圆头方颈螺栓的使用寿命是个急需解决的问题。我们从分析螺栓受力状况和断口入手,改进生产工艺,特别是热处理工艺,从而改善了螺栓机械性能,使螺栓的使用寿命提高了2～4倍,取得了较好的 GB794-67 to strengthen the semi-round head square neck bolt (hereinafter referred to as the bolt) is a large amount of fasteners used on textile machines, the country has 500,000 looms, if every stick two dollars, the use of up to one hundred Million. The bolt in the production has formed a more mature cold heading process, but the use of life is not high, often because of bolt breakage and was chased down, a direct impact on the quality of the fabric and production. Therefore, the semi-round neck bolt life is an urgent need to solve the problem. We start from the analysis of bolt stress and fracture, improve the production process, especially heat treatment process, thereby improving the mechanical properties of the bolt, the bolt life increased by 2 to 4 times, and achieved good