慢压射加速度对铜合金压铸件质量的影响.pdfVIP

学兔兔 May 2009 铸 造 Vo1．58 NO．5 FOUNDRY ·447· 慢压射加速度对铜合金压铸件质量的影响 郑 红 ，于宝义 ，王飞宇 (1．抚顺职业技术学院机电系，辽宁抚顺113006；2．沈阳工业大学材料科学与工程学院，辽宁沈阳110023) 摘要：压铸件常有气孔及氧化夹杂物等缺陷，为了减少压铸件内部气孔缺陷，文中运用有限元法对压铸过程中冲头在 压射室内匀加速运动时的流场进行了数值模拟，并通过有限元模拟的反馈信息进行了冲头加速度优化设计。模拟结果 表明．当慢压射加速度为2 m／s 时，压室中的金属液流动平稳，无气体卷入。通过模拟优化的实施，减少了压铸过程中 铸件内部出现气孔的倾向，并将实际压铸件检测结果和模拟结果进行了比较。 关键词：压铸；慢压射；加速度；模拟；铜合金 中图分类号：TG249．3 文献标识码：A 文章编号：1001—4977(2009)05—0447—03 Effect of Slow Shot Acceleration on Quality of Copper Alloy Die Casting ZHENG Hong’，YU Bao-yi ，WANG Fei-yu (1．Mechanical Engineering，Fushun Vocational Technology Institute，Fushun 1 1 0036， Liaoning，China；2．School of Material Science and Engineering，Shenyang University of Technology，Shenyang 1 1 0023，Liaoning，China) Abstract：ln order to reduce the blowhole and oxides inclusion defects which occur frequently in the die castings，Finite．element method was used to simulate flow pattern of the melt In the shot sleeve with a constant acceleration of the plunger．The finite—element simulation results were analyzed and used to optimize the motion of the plunger。The results show that the optimized acceleration of the plunger iS 2 m／s2．under which steady state liquid flow can be achieved and no entrapment of gas occur．The improvement in quality of bearing cage die casting DarlS by the optimized parameters validates the simulation results． Key words：die casting；slow shot；acceleration；numerical simulation；copper alloy 压铸件常有气孔及氧化夹杂物等缺陷，首先是压 1 压射室内金属液数值模拟模型 射室中的气体跟随金属熔体进入型腔，压铸参数不当， 气体被卷入金属熔体中而进入型腔，成为铸件的气孑L； 高温金属液