涡旋压缩机气阀复杂脱模机构及模具结构优化设计

针对结构复杂塑件-涡旋压缩机气阀自动化注射成型生产的需要，设计了一种1模2腔三板式点浇口注射模。模具中，针对塑件4处局部特征的构造特点，相应地，优化设计了4种脱模机构来实施自动脱模，分别为4次脱模复合机构、2次脱模复合机构、斜导柱滑块机构、定模弯销抽芯机构。4次脱模复合机构中，首先利用外部油缸机构完成中央内孔的第1次抽芯脱模，而后再利用延时滑块机构完成口部和端面的第2次、第3次抽芯脱模，最后，通过油缸齿条机构完成内螺纹的第4次旋转抽芯脱模。2次脱模复合机构中，先利用斜导柱滑块机构完成中央内孔的第1次抽芯脱模，再利用油缸齿条机构完成内螺纹的第2次旋转抽芯脱模。斜导柱滑块机构、定模弯销抽芯机构采用通用型机构。 通过对4次脱模复合机构、2次脱模复合机构的油缸齿条驱动机构的优化设计，优化了模具整体结构尺寸，有效降低了注塑机的使用成本。

Design of Complex Demolding Mechanism and Mold Structural Optimization for Air Valve of Scroll Compressor

Aimed at the requirement for the automatic injection molding production of complex plastic parts for a scroll compressor air valve，a type of three-plate mold with two cavities was designed. In this mold， according to the structural characteristics of four local features of the plastic parts， four kinds of demolding mechanisms were optimized to implement automatic demolding， which included a four-time demolding composite mechanism， a two-time demolding composite mechanism， an inclined guide pillar slider mechanism and a fixed mold bending pin core pulling mechanism. In the four-time demolding composite mechanism， the first core demolding of central inner hole was completed by using an external cylinder mechanism， then the second and third core demolding of mouth and end face were completed by using a delay slider mechanism， and finally the forth rotation core demolding of internal thread was completed by using the cylinder rack mechanism. In the second demolding composite mechanism， the first core demolding of central inner hole was completed by the inclined guide pillar slider mechanism， and the second core demolding of internal thread was completed by a cylinder rack mechanism. A universal mechanism was adopted to design the slider mechanism and fixed mold bent pin core pulling mechanism. Through the optimization design of the cylinder rack driving mechanisms in the four-time and two-time compound mechanisms， the overall structure size of the mold was optimized， and the operation cost of injection-molding machine was reduced effectively.