基于PLC的熔模铸造模样成型控制研究

Research on Shape Control of Investment Casting Pattern Based on PLC

在分析消失模铸造模样成型工艺过程的基础上,重点讨论了共聚物珠粒经预发泡后的模样成型过程,配置了熔模模样成型机控制系统的硬件组成.系统以西门子S7-200PLC为控制核心,TD200文本显示器为参数设置工具,该控制系统在软件设计时,将模具型腔射料、蒸汽加热二次发泡、喷水冷却、负压干燥等成型工艺过程结合起来,使消失模样成型过程实现自动化,同时可以进行手动单工序操作.最后对成型阶段中模具型腔温度过热导致模样密度和强度过低的情况进行了分析讨论,提出了双电磁阀互补调节的温度闭环控制.结果表明,基于PLC的熔模铸造模样成型控制系统在熔模造型实践中是有效的,优化了熔模铸造模样,提升了成品率.

Based on the analysis of lost foam casting mould forming process and discussed the forming process of copolymer beads by pre foaming after the configuration of the hardware components of mold pattern molding machine control system.The system used SIEMENS S7-200PLC as the control core and TD200 text display tools for setting parameters as well as the control system in software design combined the mold cavity injection, steam heating two foam, spray cooling and vacuum drying process engineering together to make lost foam casting molding process automation.At the same time it can be manually operated single procedure.Finally, the low molding density and low strength caused by the mold cavity temperature overheating were analyzed and discussed;the double solenoid valve temperature control loop regulation complementary was put forward.The results show that the molding control system based on PLC is effective in the practice of melt-molding, optimizing the investment casting mold and improving the yield.