Numerical simulation on temperature field for resistance spot welding of non-equal thickness stainless steel

An axisymmetrie finite element model is developed to simulate the temperature field of resistant spot welding according to the process characters of nugget formation of non-equal stainless steel sheets. A simulation method of the interaction of electrical and thermal factors is presented. The spot welding process of nugget formatian is simulated using hard and soft welding technique norms. The heating characters of soft and hard norms determine the differences in the process of nugget formation and determine the finally shape and offset of nugget. Experimental verification shoics that the model prediction agrees well with the practical.     

厚板铝合金搅拌摩擦焊匙孔补焊接头组织与性能

研究了35mm厚板铝合金搅拌摩擦焊匙孔补焊工艺,应用光学显微镜、扫描电镜、显微硬度仪及电子拉伸试验机等对接头的组织与性能进行了研究。结果表明,采用铝合金块材填充匙孔后进行FSW焊接,获得成型良好、表面光滑的焊缝;未加填充材料的匙孔位置,焊缝表面出现沟槽缺陷。FSW焊接一次接头的前进侧焊核区与热力影响区之间存在"吻接"缺陷;FSW焊接二次和三次接头的前进侧和后退侧过渡区均连接良好,二者组织无明显差别;FSW焊接一次和二次接头显微硬度分布呈W型,硬度最低值均出现在前进侧热影响区分别为56HV和60HV;采用搅拌头旋转速率为720r/min,焊接速率为180mm/min焊接工艺条件下,FSW焊接一次、二次和三次接头抗拉强度分别达到173、210和205MPa。     

Electrical-thermal interaction simulation for resistance spot welding nugget process of mild steel and stainless steel

A three-dimensional finite difference electrical-thermal model for resistance spot welding nugget process of mild steel and stainless steel is introduced. A simulation method of the interaction of electrical and thermal factors is presented. Meanwhile, calculation method of contact resistance and treatment method of heater structure is provided. The influence of the temperature dependent material properties and various cooling boundary conditions on welding process was also taken intoaccount in the model. A method for improving the mild steel and stainless steel joint was analyzed in numerical simulation process. Experimental verification shows that the model prediction agrees well with the practice. The model provides a usefultheoretic tool for the analysis of the process of resistance spot welding of mild steel and stainless steel.     

三层不锈钢板电阻点焊温度场数值模拟

根据三层不锈钢板电阻点焊熔核形成过程,建立了模拟三层板点焊温度场的轴对称有限元模型。在分析了三层板点焊的热电过程基础上,计算结果表明三层板点焊熔核初期是先形成包含中间板和上下工件/工件接触面的较小的熔核,随时间延长,熔核再沿轴向和径向逐渐长大的过程。通过试验验证表明,数值模拟结果与实际吻合良好。该模型为进一步的电阻点焊多层板的温度场和应力场分析提供了基础。     

基于SolidWorks模具报价系统的开发

分析了模具的价格构成，通过构造完整的产品数据库以支持模具报价过程中的分析和综合，给出了基于SolidWorks模具报价系统的组织结构，研究了系统中材料费和加工费的计算等关键技术。     

面向整体设计的客车件冲模CAD系统的实现

基于现代设计方法和计算机信息技术 ,开发了基于功能 -结构映射、支持自上而下整体设计的客车件冲裁模CAD系统。介绍了系统的总体结构、模具设计功能树的建立思想和层次化部件装配模型的特点 ,阐述了模具结构设计过程中不同层次上设计信息的处理方法 ,并通过一功能元件的设计实例说明了基于该系统的冲模设计过程。