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为了保证强力螺栓的螺纹质量,在工艺上,趋向于先淬火,后滚丝。即先进行毛坯的热处理以达到设计要求,然后才在滚丝机上滚压出螺纹。由于淬火后螺栓的强度很高,因此,滚丝轮采用Cr12MoV钢制造。由于滚丝轮热处理后螺纹不再进行加工,因此,对滚丝轮的热处理要求较严。除要保证一般模具所要求的高强度、高硬度和高的耐磨性外,还对螺纹光洁度有较高的要求。一般二级精度的螺纹光洁度要求不低于▽7,一级精度的不低于▽8。另外,还必须保证整块滚丝热处理后变形要小。技术条件规定:
In order to ensure the thread quality of strong bolts, in the process, tend to quench, after rolling. That is, the first heat treatment of the blank to meet the design requirements, and then rolled out on the thread rolling machine thread. Due to the high strength of the bolt after quenching, the rolling wheel is made of Cr12MoV steel. As the thread rolling thread heat treatment is no longer processed, therefore, the heat treatment of rolling wheel more stringent requirements. In addition to ensure that the general mold required by the high strength, high hardness and high wear resistance, but also on the thread finish have higher requirements. Generally two level accuracy of the thread finish requirements of not less than ▽ 7, a precision of not less than ▽ 8. In addition, you must also ensure that the deformation of the entire piece of wire rolling heat treatment to be small. Technical conditions: