摘要
针对压电陶瓷在作为微成形驱动器时存在的行程短、公称载荷低等问题,设计了"滑轮-丝杠-楔块"自动进给机构以实现坯料的持续挤压,采用温成形工艺改善金属成形性来扩大压电驱动系统可成形材料的范围。以此为基础,构建压电驱动式微挤压成形实验系统,并利用ZnAl4合金进行了实验验证。实验结果表明:在循环工作模式下,调节进给机构的预紧力至2600N,可以获得良好的自动进给效果和较高的成形效率;成形温度由230℃增加至270℃时,挤压ZnAl4合金所需挤压力减小50%左右。
A micro-extrusion forming system based on piezoelectric actuator has been developed.According to the actuality of short stroke and low nominal load for piezoelectric actuator,a sheave-lead screw-wedge mechanism was designed to achieve continuous extrusion by automatic feeding.Simultaneously,the warm forming process was adopted to improve metal formability and then expand the range of formable materials.With the forming system,micro-extrusion tests with micro ZnAl4cylinders were carried out to verify its feasibility.The results show that it can achieves a good feeding effect and high forming efficiency when preload force has been adjusted to 2600N,under the cyclic working mode.What's more,the extrusion force to extrude ZnAl4decreases about 50% when forming temperature increases from 230℃to 270℃.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2014年第3期50-54,共5页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(51005186
51105314)
西北工业大学研究生创业种子基金资助项目(Z2012042)
关键词
压电驱动
微挤压
预紧力
成形温度
piezoelectric actuator
micro-extrusion
preload
forming temperature
