大型挤压机机架超压预紧技术研究  

Study on super pressure pretightening of large- scale extrusion press frame

作　　者：陈永甲[1,2] 张君[1,2] 侯永超[1,2] 张万福[3] 周少凡[1,2] 冯东晓[1,2] 

机构地区：[1]中国重型机械研究院股份公司,陕西西安710032 [2]金属挤压与锻压装备技术国家重点实验室,陕西西安710032 [3]安泰科技股份有限公司,北京100081

出　　处：《重型机械》2014年第4期16-19,共4页Heavy Machinery

基　　金：国家重大科技专项(2009ZX04005-039;2011ZX04016-081);陕西省重点科技创新项目(2013KCT-10)

摘　　要：介绍了挤压机机架超压预紧的原理和实际操作方法,通过对125 MN挤压机机架预紧前后拉杆和压套的应力和变形量的测试分析,得出预紧后拉杆应力变化幅度是不预紧时的36%,预紧后拉杆伸长量是不预紧时的29.5%。因此,超压预紧延长了拉杆的疲劳寿命,提高了机架整体刚度,保证了制品精度。The principle and operation method on pretightening frame of large-scale extrusion press were intro-duced.Through analysis of stress deformation of pull-rod and pressure colum,before and after pretightening frame of 125MN extrusion press,it gained that pretightening pull-rod is 36% of stress change range of un-pretightening pull-rod,which is 29.5% of extension unpretightening pull-rod.Pretightening is able to prolong fatigue life of pull-rod,improve rigidity of extrusion press,and ensure product accuracy.

关 键 词：挤压机 超压预紧 拉杆 压套 

分 类 号：TG375[金属学及工艺—金属压力加工]