基于抽真空系统的继电器线圈BMC热固性塑料模具结构设计

Structural Design of BMC Thermosetting Plastic Mold for Relay Coil Based on Vacuum System

对于原有BMC继电器线圈模具的外观较差、线圈断线丝、生产效率及合格率较低等问题,设计了一种1模16腔布局的上、下双顶出系统的压注模具,通过抽真空系统结构的设计将注塑压力从原充填压力19~42 MPa降低至22~25 MPa,成型件采用电加热及电阻测温方法,上模镶件的温度控制在148~151℃之间,下模镶件的温度控制在148~151℃之间,通过实际生产验证抽真空系统的效果。该改进方案使不合格品率从0.08%降低至0.015%,生产效率提高了20%。结果表明,该模具通过抽真空系统的应用提高了模具的可靠性及稳定性,满足自动化数字化生产线的要求,并且,提高了生产效率与产品的合格率。

To solve the problems of poor appearance,coil breakage,low production efficiency and low qualification rate of the original BMC relay coil mold,a 1-mold-16-cavity layout injection mold with upper and lower double ejection systems was designed.By designing the vacuum system structure,the injection pressure was reduced from the original filling pressure of 19~42 MPa to 22~25 MPa.The molded parts used electric heating and resistance temperature measurement technology,and the temperature of the upper mold insert was controlled between 148~151℃,and the temperature of the lower mold insert was controlled between 148~151℃.The effect of the vacuum system was verified by actual production.The improved scheme reduced the unqualified product rate from 0.08%to 0.015%,and increased the production efficiency by 20%.The results showed that the application of the vacuum system improved the reliability and stability of the mold,met the requirements of the automated digital production line,and improved the production efficiency and producted qualification rate.