新能源汽车仪表罩热流道注射模设计

Design of Hot Runner Injection Mold for New Energy Car Instrument Cover

结合仪表罩塑件的复杂结构特点,首先采用CAE方法将传统的多点冷浇口优化为两点式热浇口浇注模腔,进一步得到模腔的冷却采用7条管道进行冷却,优化后塑件的翘曲变形为能控制在1.8 mm以内,满足GB/T 14486 MT5—B级要求。根据CAE优化结果,模具结构设计为两板式热流道模具。模具中,为解决塑件斜壁侧向脱模困难问题,采用脱模方向归一法将塑件的侧向脱模机构简化为7个滑块机构,其中,包括6个斜导柱滑块机构和1个液压油缸抽芯机构。为解决塑件斜壁顶出脱模易导致塑件顶出变形而超差的问题,设计了一种截面为25 mm×14 mm的方顶杆用作斜壁的最终顶出脱模,有效地防止了塑件的顶出变形。模具克服了仪表罩塑件传统设计中的缺陷,为同类塑件的模具结构设计提供了有效参考。

Aimed at the complex structural characteristics of the plastic parts of the instrument cover,the traditional multi-point cold gate was optimized into a two-point hot gate by CAE analysis to gate the mold cavity,and then the cooling of the mold cavity was obtained by using seven waterways.After optimizing the waterway,the warping deformation of the plastic parts could be controlled within 1.8 mm,meeting the requirements of the designated national G/T 14486 MT5-B level.According to the CAE optimization results,the mold structure was designed as a two-plate hot runner mold.In the mold,aiming at the difficulty of lateral demoulding of plastic parts with angle walls,the lateral demoulding mechanism of plastic parts was simplified into 7 slider mechanisms by using the method of demoulding direction normalization,including 6 slider mechanisms with angle pins and 1 hydraulic cylinder core-pulling mechanism.Aimed at the problem that the ejection deformation of plastic parts was easy to be caused by the ejection and demoulding of inclined wall,a square top bar with a cross-section of 25 mm×14 mm was designed for the final ejection and demolding of inclined walls,which effectively prevent the ejection deformation of plastic parts.The mold overcomes the shortcomings of traditional design of plastic parts for instrument cover,and could provide useful reference for the mold structure design of similar plastic parts.