压铸机计算机控制系统研究

系统地介绍了28000kN压铸机计算机控制系统的设计。在硬件方面,输入输出板均采用了光隔,抗干扰能力强。在软件设计上,采用定时中断,即实现了高速采样,又可周期性地扫描输入输出端口的状态,循环发出动作指令,这种模拟可编程控制器的程序设计方法,大大提高了整个系统的性能。     

Novel cooling channel shapes in pressure die casting

The pressure die casting involves die designs incorporating cooling channels positioned to facilitate the controlled extraction of energy from a solidifying casting. It is now known that subcooled nucleate boiling can occur in cooling channels and this paper is concerned with novel cooling channel shapes that are optimized to promote and enhance this boiling and thus reduce casting times. Shape sensitivity analysis is applied to a boundary element model using the material derivative adjoint variable technique. Mesh node positions on the cooling channels are used as the design parameters. The sensitivities are used in a conjugate gradient non‐linear optimization routine. It is shown that with this approach cooling channels can be designed to maximize boiling heat transfer whilst at the same time allow some degree of control of spatial temperature variation over the die cavity surface. Simulation and experimental results are presented for a traditional die and an optimized die. A 60 per cent reduction in cycle time is achieved with the optimized die. Copyright © 2001 John Wiley & Sons, Ltd.     

Superficial in-mould carburising and alloying of steel castings

In-mould superficial carburising of steel castings has been carried out by two methods. The first is based on the use of carbon fibres, which are applied to the surface of the mould cavity. These are readily wetted and impregnated by liquid steel. During solidification and cooling the carbon fibres dissolve and produce a layer with the structure of a high-carbon steel or white iron. The use of carbon powders is not efficient as their capillary properties are lower than those of carbon fibres. In the second method, soot can be used instead of carbon fibres because the liquid phase is generated inside the layer following a reaction between carbon and metal particles. Alloying the powder mixture with particles of ferroalloys or metals leads to the formation of a liquid + solid slurry that “stabilises” the formation of a carburised and alloyed layer. Use of a cheap brand of carbon fibre felt is preferable in all cases.     

康明斯B系列柴油发电机驱动端盖压铸模的结构优化

分析了康明斯B系列柴油发电机驱动端盖的结构特点，对原有压铸模具结构进行了优化，大大提高了生产效率及模具寿命。     

压铸模溢流系统设计知识的神经网络模拟

根据真值流推理神经网络的作用 ,通过对压铸模溢流系统溢流口截面积SV 与浇注系统内浇口截面积SG 的比值SV/SG 的模糊推理 ,进行了溢流系统设计知识的模拟。     

压铸铝汽缸镀铬

阐述了压铸铝汽缸铬工艺及不合格支的无铬电退镀方法，并提供工艺配方 。     

压铸TiC/Al-9Si-1.4Cu-0.5Mg复合材料的拉伸性能

利用熔铸-原位反应和压铸成形技术制备了TiC/Al-9Si-1.4Cu-0.5Mg复合材料,测试了复合材料的拉伸性能.结果表明:TiC/Al-9Si-1.4Cu-0.5Mg复合材料的室温极限拉伸强度为354MPa,比基体合金提高26%;260℃时复合材料的极限拉伸强度为272MPa,比基体合金提高46%.复合材料的延伸率与Al-9Si-1.4Cu-0.5Mg合金相当.讨论了进一步提高熔铸一原位反应TiC/Al-9Si-1.4Cu-0.5Mg复合材料拉伸强度的途径.     

高吊灯电器箱压铸模设计

介绍了灯具电器箱铝合金压铸模设计及优化方案。     

连接盘压铸模设计

介绍连接盘压铸模的设计方案,浇注系统采用U型浇口,缩短了填充时间,避免填充过程中排气不畅的问题,冷却系统采用可控式点冷却控制模具温度,以提高铸件质量,上滑块采用压块结构,左、右滑块采用前锥套结构能精确定位,有效保证了压铸生产过程中滑块机构的稳定性。     

金属型重力铸造摩托车铝合金整体车轮

论述了重力铸造摩托车铝合金整体车轮的模具结构、工作原理及特点、铸造工艺流程、工艺参数及制品性能。指出,金属型重力铸造工艺是目前及今后应用最广泛的比较适用的最佳工艺,应加大研究力度,逐步采用全自动浇注机器人系统,借助于程序化模拟人的浇注行为,最大限度地满足金属型重力浇注工艺要求。