先进铸造技术.doc

先进铸造技术英文论文翻译姓名：王鹏飞 学号：0905010117 指导教师：杜晓明 论文出处：Journal of Materials Processing Technology（材料加工技术杂志）文章题目：Development of a device for dynamical measurement of the load on casting and the contraction of the casting in a sand mold during cooling译：铸件负载动态测量设备的研发以及冷却冷却过程间铸件在砂型中的收缩作者及机构：John A. ROGERS University of Illinois Urbana-CampaignTo predict and control the residual stress present in sand casting manufactured via CAE (Computer Aided Engineering), the mechanical interaction between the casting and the sand mold during cooling must be determined experimentally. A device was developed in this study to determine the load on the casting caused by the resistance of the mold and the contraction of the casting during cooling. Our device consists of two modules that work simultaneously: a module containing a load cell, for measuring the load on the casting during cooling and a module containing an LVDT (Linear Variable Differential Transformer) for measuring the contraction of the casting during cooling. In performance verification testing, the device enabled the simultaneous measurement of the load on the sand casting and the contraction of the casting. This measurement was performed dynamically during the cooling process. Additionally, for the case where the contraction of the casting was hindered by the sand mold, the permanent deformation of the casting after shake out (which leads to residual stress in the casting) was successfully measured using our device摘要通过CAE（计算机辅助工程）来预测和控制出现在砂型铸造生产机械互动中的残余应力以及冷却过程中实验所决定的铸件和砂型间的机械互动。一件设备在一项研究中被开发出来，所谓这项研究就是在冷却过程中确定由模具阻力和铸件收缩引起的铸件负载。我们的设备由同时工作的两个模块组成：一个模块包含一个负载细胞，这是用来测量冷却过程中铸件的负载。另一个模块包含一个LVDT（线性差动变压器），用来测量冷却过程中铸件的收缩。在性能验证测试中，该设备能够同时测量铸件负载和铸件收缩。这项测试是在动态下的冷却过程中执行的。此外，根据砂型阻碍铸件收缩的情况，清理后的铸件其永久变形（铸造中导致了残余应力）被我们的设备成功测量出来。Keywords（关键词） Sand mold; 砂型 Sand casting; 砂型铸造 Residual stress; 残余应力 Distortion; 失真 CAE; 计算机辅助工程 Aluminum alloy;铝合金1. Introduction（介绍）1) Temperature difference within a casting during cooling冷却过程中铸件内的温差 2) Sand mold restraint on the contraction of the casting during cooling冷却过程中关于铸件收缩的砂型限制 3) Phase transformations in the solid state during cooling冷却过程中的固态相变 2. Experimental device（实验设备） 2.1. Outline of the device（设备概要）2.2. Module for measuring the load on the casting during cooling （冷却过程中测量铸件负载的模块）2.3. Module for measuring the contraction of the casting during cooling （冷却过程中测量铸件收缩的模块）2.4. Critical issues（关键问题）2.4.1. Avoiding the restraint due to the sand between the sprue and the metal molding box（避免浇口和金属型箱体间型砂的约束）2.4.2. Avoiding a load caused by thermal expansion of the cast part after pouring（避免浇注后由于铸件部分热膨胀引起的负载）3. Testing the device（测试设备）4. Results and discussion（结果与讨论）4.1. Results of the dynamical measurement of the load on the casting and the contraction of the casting during cooling（冷却过程中铸件负载和铸件收缩的动态测量结果）4.2. Measuring the permanent deformation of the casting after shake out （铸件清理后后其永久变形的测量）4.2.1. Method for measuring the permanent deformation （测量永久变形的方法）4.2.2. Total contraction without permanent deformation (contraction of the flangeless casting cast in green sand mold) （没有永久变形的总收缩湿砂型中无凸缘铸件的收缩）4.2.3. Total contraction of the casting that had received a restraining force from the sand mold （受到砂型约束力铸件的总收缩）5. ConclusionsIn previous studies of the restraint due to a sand mold on the contraction of a casting during cooling, only the contraction of the sand casting was examined. In particular, neither the static load on the casting just before the shake out nor the dynamical load on the casting during cooling was measured. Therefore, a device was developed in this study to determine the mechanical interaction between the casting and the sand mold during cooling. Our conclusions regarding this device are summarized as follows. 1.The developed device enables the simultaneous and dynamical measurment of the load on the casting and the contraction of the casting during cooling2. The permanent deformation of the casting after shake out was successfully measured with a precision of 93m.结论以前的约束