一步法注射成型胶料在机筒内的温度场分析

Temperature Field Analysis of One-step Injection Molding of Compound in Barrel

分析一步法注射成型胶料在机筒内的温度场。通过建立实体模型和数学模型,将整根螺杆平均分成6段,依次模拟机筒中胶料的温度变化,螺杆和机筒施加温度约束(140℃),将螺杆和机筒对胶料的热传导作为温度场的主要影响因素,热流密度呈线性变化。通过有限元分析,在螺杆长径比为14、导程为90 mm的情况下胶料在机筒停留48 s即可充分达到塑化温度,因此对螺杆参数进行优化,如改变螺杆螺距、减小螺杆长径比等,可以节省螺杆和机筒材料用量,达到设备设计优化的目的。

The temperature field of one-step injection molding compound in the barrel was analyzed. By establishing physical model and mathematical model, the whole screw was divided into six sections, and the temperature change of rubber compound in barrel was simulated in turn. The screw and barrel were bound by temperature 140 °C . The heat conduction between the screw and barrel was assumed as the main factor affecting the temperature field,and the heat flux changed linearly. Through finite element analysis,the plasticizing temperature could be fully reached with the residence time of 48 s when the length to diameter ratio of the screw was 14 and the lead was 90 mm. Therefore,by optimization of the screw parameters, such as the pitch of the screw and the length to diameter ratio of the screw, the material consumption of the screw and barrel could be reduced,and the equipment design was optimized.