电动汽车水冷机壳热芯盒电加热温度控制系统设计

Design of Electric Heating Temperature-control System for the Hot Core Box of Water-cooled Casing of Electric Vehicle

针对圆筒形电动机壳砂芯分成5个方向射芯成型、热芯盒模具必须分成多个模具体的结构特点,分析电动汽车电动机壳内部中空水冷循环结构的低压铸造热芯盒砂芯成型工艺要素,设计了一套温度控制系统。该系统由PLC作为控制核心,能够控制每块芯盒模具开合及自动射砂动作,精确控制热芯盒砂芯的成型温度,达到每个模具体加热升温至同一预设温度值时启动射砂的目标,改变了依靠生产工人的经验判断预热时间以及射芯时机、固化时间等落后方法,提高砂芯热固化的质量和强度,保证合格率。

The cylindrical sand core of motor casing was formed in five directions of core-shooting,so the hot core box mold must be divided into several parts. Through analyzing the forming elements for low pressure casting of sand core that was used in hollow circulation water-cooled structure of motor casing of electric vehicle,a temperature control system was designed. The system is mainly operated by PLC, which can control each mold＇s opening and closing, and the automatic shooting. It can also precisely controling the molding temperature of the sand core of the hot box, and the goal of sand shooting is achieved when each mold heats up to the preset temperature. The system changes the backward ways that rely on the experience of production workers to determine the warm-up time, time of core shooting and curing time and so on.Finally, it improves the quality and strength of the sand core, and ensure the qualification rate.