800MN压机大拉杆精密预紧方法

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	英文篇名：Precision Pretightening Method for Large Pull Rod of 800MN Press 作者：段宏斌 英文作者：Duan Hongbin; 关键词：压机 ; 大拉杆 ; 二次加热 ; 预紧 英文关键词：press;;large pull rod;;twice heating;;pretightening 中文刊名：ZXJK 英文刊名：China Heavy Equipment 机构：二重(德阳)重型装备有限公司; 出版日期：2019-05-13 出版单位：中国重型装备 年：2019 期：No.140 语种：中文; 页：ZXJK201902009 页数：2 CN：02 ISSN：51-1702/TH 分类号：28-29

摘要

机架预紧采用的传统方法是电加热预紧方法,不能迅速直观地反映出预紧力的大小,虽然可以事先进行热变形计算,但在实施预紧过程中影响因素很多,且不易排除,因而往往达不到预紧要求。针对800 MN压机机架结构特点,研究采用了二次加热预紧技术对巨型拉杆进行精密预紧。
        The traditional pretightening method of the frame is electric heating,which can't reflect the size of the pretightening force quickly and intuitively. Although the thermal deformation can be calculated in advance,there are many influencing factors in the process of pretightening,and they are not easy to be excluded,so it often can't reach the pretightening requirements. In view of the structural characteristics of 800 MN press frame,the technology of twice heating pretightening has been researched and applied to precision pretightening of giant pull rod.

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