重卡SMC前面罩模压模具设计

Design of Compressing Mold for Heavy Duty Truck SMC Front Panel

前面罩作为卡车车身外重要的覆盖件之一,其材质要求较高。片状模塑料(SMC)具有强度高、比重小、可设计性强、耐腐蚀等优点,成为卡车前面罩材质优选。针对产品结构的特点,设计了一套固定式多型腔半溢式模压模具,设计了加热系统、脱模机构、侧向抽芯机构、型芯与芯腔等。通过对模腔配合形式的设计,提高SMC片材充模效果,可获得量均匀密实、表面质量良好的制品。采用“直通式+水井式”的加热管道,使模具温度保持均匀,保证制品模内均匀固化。采用“推杆+推管”结合的脱模机构,使脱模力均匀分布,通过推管型芯对预埋嵌件定位,简化了模具结构。经生产验证,该模具结构合理,模具能连贯完成合模、顶出、复位等动作,模压产品形状稳定。

As one of the important covering parts outside the truck body,the front cover has high material requirements.Sheet molding comound(SMC) has the advantages of high strength,small specific gravity,strong designability and corrosion resistance,and has become the preferred material for truck front cover.According to the characteristics of the product structure,a set of fixed multi-cavity semi-overflow mold was designed,and the heating system,demoulding mechanism,side core-pulling mechanism,core and core cavity were designed.Through the design of the cavity matching form,the filling effect of SMC sheet is improved,and the products with uniform density and good surface quality can be obtained.The ’straight through+well type’ heating pipe is adopted to keep the mold temperature uniform and ensure the uniform curing of the product in the mold.The demoulding mechanism of ’ push rod + push pipe ’ is adopted to make the demoulding force evenly distributed.The embedded parts are positioned by the push pipe core,which simplifies the mould structure.The production verification shows that the mold structure is reasonable,the mold can continuously complete the clamping,ejection,reset and other actions,and the shape of the molded product is stable.