铝合金板温成形过程拉深筋部位摩擦系数的测试  

Testing of Friction Coefficient in Drawbead of Aluminum Alloy Sheet During Warm Forming Process

作　　者：郭正华[1] 贺荣[1] 郭吉萍[1] 李志刚[2] 

机构地区：[1]轻合金加工科学与技术国防重点学科实验室,南昌航空大学材料科学与工程学院,江西南昌330063 [2]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

出　　处：《热加工工艺》2008年第19期8-12,共5页Hot Working Technology

基　　金：华中科技大学材料成形与模具技术国家重点实验室开放基金资助项目(07-02:2007.5~2009.4)

摘　　要：基于板料成形时法兰区周向收缩、厚向增厚的特点和温成形的环境,针对铝合金板温成形过程拉深筋部位摩擦系数的测量,研制了一套新型摩擦测试装置。探讨了压边力、成形温度、润滑状态三种工艺参数和铝合金板试样楔形角对拉深筋部位摩擦系数的影响。研究表明,成形温度和润滑剂对摩擦系数影响比压边力明显;当不采用润滑剂时,随着成形温度从室温上升到250℃,摩擦系数有明显的增加;在高温状态下,三种润滑剂的使用,都可以大大降低温成形时的摩擦系数,但这三种润滑剂之间的润滑效果差异并不明显;在不同楔形角的铝合金试样成形过程中,拉深筋部位的摩擦系数随着角度的增大而增大。Based on the characteristic of micro-crinkling and thickness increasing and the environment ot warm forming at flange zone in sheet metal forming, a new set of friction coefficient measurement device was developed. The effects of three processing parameters including blankholding force, forming temperature, lubrication condition and the wedge-shaped edge of aluminum alloy sheet sample on friction coefficient in drawbead zone were studied. The results show that the effect of blankholding force on friction coefficient is less than forming temperature and lubrication condition; while without lubricat℃ion, when the forming temperature is from room-temperature to 250℃, the friction coefficient in drawbead increases; under high temperature, using the three anti-friction materials can decrease the friction coefficient in warm processing, but their differences are not remarkable; during the forming of different wedge-shaped edge of aluminum alloy sheet sample, the friction eocffieient in drawbead increases with the increase of the angle.

关 键 词：铝合金板 温成形 拉深筋 摩擦测试 摩擦系数 

分 类 号：TG376.2[金属学及工艺—金属压力加工]