面向大型压铸模型腔壁厚的模糊优化没汁

运用多目标模糊优化设计的原理,结合大型压铸模的工作条件,建立了逼近实际工况的型腔壁厚数学模型.采用最优水平截集法求解,并用复合形法进行优化.并给出了这种设计方法应用于潜望镜镜身铸件压铸模的工程实例.     

两步法氧－乙炔喷熔工艺修复压铸模

采用５０％Ｎｉ４５＋５０％Ｎｉ６０合金粉的两步法氧－乙炔喷熔工艺，大大提高了３Ｃｒ２Ｗ８Ｖ压铸模的使用寿命。     

两步法氧—乙炔喷熔工艺修复压铸模

采用５０％Ｎｉ４５＋５０％Ｎｉ６０合金粉的两步法氧－乙炔喷熔工艺，大大提高了３Ｃｒ２Ｗ８Ｖ压铸模的使用寿命。     

压铸模CAD技术的研究及其应用

分析了压铸模CAD技术的基本特征,介绍了以UG作为平台的压铸模CAD软件模块框架。同时给出了该压铸模CAD系统型腔结构设计模块的实现方法。     

基于Pro/E及EMX的金属支架压铸模具设计

本文针对金属支架类铸件壁薄和难以成型的特点,探讨了Pro/E软件在压铸模具设计中的优点,介绍了基于Pro/E软件压铸模具开发的一般流程;并借助注射模具模架系统EMX,为压铸模具装配了模架。结果表明,基于Pro/E软件的压铸模具设计方法,可大大提高压铸模具设计的效率,缩短设计周期,具有一定的推广价值。     

国内外压铸模具CAD技术现状与发展趋势

介绍了国内外压铸模CAD技术的发展概况,对我国压铸模CAD研究与开发存在的问题进行了分析,并就发展我国的压铸模CAD技术提出几点建议。     

压铸模具混合装配建模方法研究

针对压铸模具设计特点,进行基于混合装配的压铸模具结构优化设计方法研究,使压铸模具混合装配建模与结构设计构建成一个整体,实现压铸模具并行设计。     

国内外压铸模具CAD技术坝状与发展趋势

介绍了国内外压铸模CAD技术的发展概况,对我国压铸模CAD研究与开发存在的问题进行了分析,并就发展我国的压铸模CAD技术提出几点建议.     

基于UG的压铸模设计与分析

以铝合金压铸件为例,分析了压铸件工艺,介绍了应用UG软件设计压铸模的思路以及UG软件的运动仿真和高级仿真功能在压铸模设计中的应用。结果表明,利用UG软件的仿真功能可以较好地检验压铸模结构及其强度。     

基于Solid Works的压铸模三维设计

以支架压铸模设计为例,介绍了Solid Works软件中的零件模块、模具模块及装配模块等在压铸模设计过程中的使用方法,对利用Solid Works进行其他零件的压铸模设计具有一定的参考意义。     

Die design optimization of die casting for fabrication of fuel cell aluminum bipolar plate with micro-channel through casting simulation and experimental investigation

In vacuum die casting, we require a high quality die design for fuel cell bipolar plates to prevent unfilled phenomena, turbulent flow, and porosity. We have designed a die for thin plate die casting using two geometric shapes. In addition, we propose a new overflow system based on numerical simulation, and conducted actual vacuum die casting experiments. An optimal die design consists of seven overflows at the end of the cavity and three overflows at each side wall of the cavity. In our experiment, the molten metal that passed the gate and reached the side wall flowed into the side overflow, no turbulent flow occurred, and the filling behavior and are uniform. In addition, partially solidified molten metal passing through the channel was perfectly eliminated by overflow without back-flow. To validate the proposed approach, a good quality sample was manufactured using the optimal die design with the proposed overflow system.     

大型压铸机合模机构的多目标模糊优化设计

基于多目标模糊优化设计的原理,结合大型压铸机合模机构的性能和尺寸要求,建立了符合实际工况的数学模型,并用最优水平截集法求解,用复合形法上机寻优.研究结果表明,多目标模糊优化在合模机构设计方面具有较高的实用价值.     

Design and Verification of an Auxiliary System for High Vacuum Die Casting

Vacuum die casting is the optimal method to produce high quality aluminum alloy components.At present,there are still very few systematic studies on vacuum die casting theory and equipment design.On the basis of the existing theories of the vacuum die casting pumping and venting systems,a simplified model is established in this research.The model has an aggregate unit consisted of "vacuum pump + buffer tank" and a cylindrical container(including the shot sleeve,cavity and exhaust channel).The theoretical analysis is carried out between the cavity pressure and the pumping time under different volume models.An auxiliary system for high vacuum die casting is designed based on the above analysis.This system is composed of a vacuum control machine and a new vacuum stop valve.The machine has a human-computer control mode with "programmable logic controller(PLC) + touch screen" and a real-time monitoring function of vacuum degree for buffer tank and die cavity.The vacuum stop valve with the "compressed gas + piston rod + labyrinth groove" structure can realize the function of whole-process vacuum venting.The new system shows great advantages on vacuuming the cavity with a much faster speed by making tests on an existing die casting mold and a 250 t die casting machine.A die cavity pressure less than 10 kPa can be reached within 0.8 s in the experiment and the porosity of castings can be greatly decreased.The systematic studies on vacuum die casting theory and equipment have a great guiding significance for high vacuum die casting,and can also be applied to other high vacuum forming in related theoretical and practical research.     

汽车铝合金轮毂低压铸造模具设计

本文分析了低压整体式铝合金轮毂的低压铸造工艺性,并从铸型分型面、铸型不期而遇腔尺寸和铸型壁厚的确定,铸型排气系统、浇注系统、冷却系统的设计等几方面介绍了该产品模具结构设计要点。     

太阳辐照度绝对辐射计吸收腔结构优化

为了获得太阳辐照度绝对辐射计中吸收腔的最优结构参数,需要对结构中吸收腔-热连接-热沉构成的传热链进行热分析。基于Ansys软件的有限元方法,给出了上述传热链的仿真模型,并计算得到了仿真结构的温度响应曲线;通过改变吸收腔的结构参数(尺寸、材料等),探究了不同参数下传热状态的变化及其原因;通过分析仿真结果确定了吸收腔最优结构参数。仿真结果表明:在环境温度为常温(298K)、加热功率为50mW的情况下,吸收腔最优结构参数为壁厚0.07mm/锥顶角30°/帽檐宽度2.2mm/银质,此时辐射计的时间常数为11.501s、响应度为1.391K;同等条件下进行实验,测得时间常数为11.487s,响应度为1.397K,与仿真结果相比,误差分别为0.12%和0.43%。仿真结果基本符合理论推导,所得数据具有足够的可靠性,证明该模型可以指导绝对辐射计优化设计,提高其工作性能。     

浅析棘轮本体金属模低压铸造工艺与模具设计

低压铸造是介于金属型铸造和压力铸造之间的一种铸造方法。其是在一定的压力作用下,将金属熔液注入铸型型腔。并在压力的作用下凝固以获得铸件的方法,本文主要是对棘轮本体金属模低压铸造工艺与模具设计进行探寻和改进,根据以往的各种铸造方法的优势和劣势不断总结经验,不断的探索挖掘,使模具设计及铸造工艺得到了更全面的改进。     

A system for design of multicavity die casting dies from part product model

Design of a die casting die is a nontrivial task, which depends upon a number of influencing factors related to material, part geometry, manufacturing resources, cost, delivery time, etc. Complexity of this die design activity further increases in case of a multicavity die. Currently available die design systems lack in the level of automation and do not explicitly address multicavity die design. Present work is an attempt to develop a system, which facilitates computer-aided design of a multicavity die casting die. The objective of the proposed system is to automate the process of deciding number of cavities, design of cavity layout and die–base, and core and cavity creation for a multicavity die casting die. The proposed system, which we named Auto_Die_Caster, works as an add-on application to solid modeling software SolidWorks. The proposed system is divided into four modules, namely data initialization, cavity design, cavity layout and die–base design, and core–cavity design. Use of commercial software like SolidWorks as a platform both for part design and generation of die design eliminates loss of data which makes the proposed system quite useful in the industrial scenario. To demonstrate the capabilities of Auto_Die_Caster, it was tried for a number of die casting parts and the results are presented. Proposed system is a step forward to design manufacturing integration for die casting process.     

天然气长输管线固定球阀壳体壁厚热-结构耦合优化设计

介绍了基于ANSYS的结构优化设计的基本方法,建立了天然气长输管线固定球阀壳体壁厚热-结构耦合优化分析的数学模型,采用零阶优化方面对其壁厚在公称压力15 MPa及不同温度作用下进行了数值分析。结果表明由常规公式计算出来的壳体壁厚略小于有限元分析得出的最优壁厚,避免了设计缺陷的产生,结果表明,应用有限元热-结构耦合优化,可更好的设计壳体壁厚,弥补常规公式计算的不足。     

真空压铸设备升级改造研究与实践

针对普通真空压铸设备生产过程中出现的产品问题,提出了升级改造压铸机的解决方法并进行实践,为压铸产品质量改善提供一种途径。通过设计并比较不同的方案,经过多次实践实验,确定了升级改造用真空箱结构,并对相应的模具结构设计提出了经济可行的方法,经过试模验证了模具设计的合理性,产品质量更好,实现了有效可靠的压铸机控制系统,为压铸行业设备升级改造提供经济性和可靠性均较高的解决方案。     

基于流函数法的铝型材挤压导流模合理设计

采用模拟试验法和理论分析法研究了导流模内型材挤压的流动机理;提出了确定导流腔最小深度的理论依据;用基于流函数的上限分析法确定了实心薄壁铝型材挤压变形的流线方程、动可容速度场、应变速率场及上限功率;讨论了变形程度等参数对导流模最小理论深度的影响,得出实心薄壁铝型材导流腔深度的理论最小值为导流腔半宽的0.7～0.8倍。理论结果得到了试验证实,为导流模合理设计提供了可靠的依据。