本文主要研究内容
作者边迪（2019）在《纯铜杯形件微冲压实验及数值模拟研究》一文中研究指出：近年来,各行业对微型零件的需求量越来越大,以其优越的导电性、导热性以及塑性在航空航天、医疗、电子通讯、等领域内有广泛的应用,微机电系统(MEMS)迅速的崛起,也推动了零件微型化的发展。随着微型化和轻量化的发展,微成形因为其效率高、成本低、持续时间短、污染小的特点而具有非常广阔的发展前景。本文通过退火工艺来研究晶粒尺寸效应对铜箔力学性能的影响,通过微冲压实验和数值模拟来研究晶粒尺寸效应和冲压工艺对杯形件变形行为的影响,并成功冲压出直径为0.9mm微小杯形件。退火温度的升高,晶粒尺寸增加,铜箔的抗拉强度降低。铜箔的断裂机制由混合断裂方式转化为滑移分离断裂方式。退火之后的铜箔可以冲压出完整的杯形件,当晶粒尺寸从10μm增加到20μm时,杯口的突起减小。随着晶粒尺寸的继续增加,表面的凹坑增多。晶粒尺寸从10μm增加到35μm时,最大冲压力从37.7N降低到32.6N。当晶粒尺寸从35μm增加到68μm时,最大冲压力从32.6N增加到33.4N,并且第二个峰值逐渐增大,厚度分布不均匀性增加。当晶粒尺寸从10μm到35μm,冲压速度从0.1mm/s增加到1mm/s时,会使杯形件的表面质量有一定的提高,当冲压速度达到10mm/s时会出现严重的冲击纹。当晶粒尺寸增加到68μm时,冲压速度的增加反而会使杯形件的表面质量下降。模拟的结果表明,晶粒尺寸从10μm增加到68μm,杯形件内表面褶皱高度从9.41px增加到21.19px,杯口变形不均匀区长度从0.03mm增加到0.16mm,厚度分布的标准差从5.73增加到6.99,最大冲压力从19.63N降低到14.17N,应力应变的分布更加不均匀。当冲头倒角从0.25mm增加到0.3mm时,杯形件圆角外侧所受到的拉应力减小。当冲头倒角从0.3mm增加到0.35mm时,杯形件圆角外侧应力反而增加。随着冲头倒角尺寸的增加最大冲压力逐渐降低,并且冲压力的峰值出现的越晚。当凹模倒角为0.15mm时,最大冲压力最大并且杯形法兰部分发生自锁现象导致件底部发生严重的网格畸变,当凹模倒角增加时最大冲压力降低,杯口部分的等效应变增加,同时杯形件在成形过程中法兰部分圆角处拉应力降低。
Abstract
jin nian lai ,ge hang ye dui wei xing ling jian de xu qiu liang yue lai yue da ,yi ji you yue de dao dian xing 、dao re xing yi ji su xing zai hang kong hang tian 、yi liao 、dian zi tong xun 、deng ling yu nei you an fan de ying yong ,wei ji dian ji tong (MEMS)xun su de jue qi ,ye tui dong le ling jian wei xing hua de fa zhan 。sui zhao wei xing hua he qing liang hua de fa zhan ,wei cheng xing yin wei ji xiao lv gao 、cheng ben di 、chi xu shi jian duan 、wu ran xiao de te dian er ju you fei chang an kuo de fa zhan qian jing 。ben wen tong guo tui huo gong yi lai yan jiu jing li che cun xiao ying dui tong bo li xue xing neng de ying xiang ,tong guo wei chong ya shi yan he shu zhi mo ni lai yan jiu jing li che cun xiao ying he chong ya gong yi dui bei xing jian bian xing hang wei de ying xiang ,bing cheng gong chong ya chu zhi jing wei 0.9mmwei xiao bei xing jian 。tui huo wen du de sheng gao ,jing li che cun zeng jia ,tong bo de kang la jiang du jiang di 。tong bo de duan lie ji zhi you hun ge duan lie fang shi zhuai hua wei hua yi fen li duan lie fang shi 。tui huo zhi hou de tong bo ke yi chong ya chu wan zheng de bei xing jian ,dang jing li che cun cong 10μmzeng jia dao 20μmshi ,bei kou de tu qi jian xiao 。sui zhao jing li che cun de ji xu zeng jia ,biao mian de ao keng zeng duo 。jing li che cun cong 10μmzeng jia dao 35μmshi ,zui da chong ya li cong 37.7Njiang di dao 32.6N。dang jing li che cun cong 35μmzeng jia dao 68μmshi ,zui da chong ya li cong 32.6Nzeng jia dao 33.4N,bing ju di er ge feng zhi zhu jian zeng da ,hou du fen bu bu jun yun xing zeng jia 。dang jing li che cun cong 10μmdao 35μm,chong ya su du cong 0.1mm/szeng jia dao 1mm/sshi ,hui shi bei xing jian de biao mian zhi liang you yi ding de di gao ,dang chong ya su du da dao 10mm/sshi hui chu xian yan chong de chong ji wen 。dang jing li che cun zeng jia dao 68μmshi ,chong ya su du de zeng jia fan er hui shi bei xing jian de biao mian zhi liang xia jiang 。mo ni de jie guo biao ming ,jing li che cun cong 10μmzeng jia dao 68μm,bei xing jian nei biao mian zhe zhou gao du cong 9.41pxzeng jia dao 21.19px,bei kou bian xing bu jun yun ou chang du cong 0.03mmzeng jia dao 0.16mm,hou du fen bu de biao zhun cha cong 5.73zeng jia dao 6.99,zui da chong ya li cong 19.63Njiang di dao 14.17N,ying li ying bian de fen bu geng jia bu jun yun 。dang chong tou dao jiao cong 0.25mmzeng jia dao 0.3mmshi ,bei xing jian yuan jiao wai ce suo shou dao de la ying li jian xiao 。dang chong tou dao jiao cong 0.3mmzeng jia dao 0.35mmshi ,bei xing jian yuan jiao wai ce ying li fan er zeng jia 。sui zhao chong tou dao jiao che cun de zeng jia zui da chong ya li zhu jian jiang di ,bing ju chong ya li de feng zhi chu xian de yue wan 。dang ao mo dao jiao wei 0.15mmshi ,zui da chong ya li zui da bing ju bei xing fa lan bu fen fa sheng zi suo xian xiang dao zhi jian de bu fa sheng yan chong de wang ge ji bian ,dang ao mo dao jiao zeng jia shi zui da chong ya li jiang di ,bei kou bu fen de deng xiao ying bian zeng jia ,tong shi bei xing jian zai cheng xing guo cheng zhong fa lan bu fen yuan jiao chu la ying li jiang di 。
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论文详细介绍
论文作者分别是来自辽宁科技大学的边迪，发表于刊物辽宁科技大学2019-11-25论文，是一篇关于尺寸效应论文,微冲压论文,变形行为论文,数值模拟论文,辽宁科技大学2019-11-25论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自辽宁科技大学2019-11-25论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
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