泵壳双层滑块脱模机构注塑模具设计
Design of Injection Mold of Pump Housing with Double-layer Slider Ejection Mechanism
针对泵壳顶部和底部侧向分布的两个管道,确定两管道间的结构部分成型为模具设计难点,进而设计一副单型腔双层滑块脱模机构的注塑模具。在定模侧设计弯销+滑块的脱模机构,实现两管道间结构部分的第一次脱模,其滑块运动距离为16 mm。同时,设计独立的抽芯油缸,抽芯行程至少为41 mm,实现泵壳顶部的侧向管道成型。在动模侧设计弯销+滑块以及油缸+滑块的脱模机构,实现两管道间结构部分的第二次脱模,滑块运动最大距离为39 mm。同时,设计弯销+滑块抽芯机构,抽芯行程至少为34 mm,实现泵壳底部管道成型。通过合理控制分型顺序以及两个油缸的运动顺序,成功实现塑件脱模,可为类似塑件注塑成型及双层滑块脱模机构设计提供参考。
A single-cavity injection mold with a double-layer slider ejection mechanism was designed for the pump housing, which featured two laterally distributed pipes at the top and bottom. The molding of the structural section between the two pipes was identified as the critical design challenge in mold development. On the fixed mold side, a bent pin+slider ejection mechanism was designed to achieve the first ejection of the structural section between the two pipes, with a slider travel distance of 16 mm. Meanwhile, an independent core-pulling hydraulic cylinder was designed with a core-pulling stroke of at least 41 mm to realize the molding of the lateral pipe at the top of the pump housing. On the movable mold side, a bent pin+slider and a hydraulic cylinder+slider ejection mechanism were designed to achieve the second-stage ejection of the structural section between the two pipes, with a maximum slider travel distance of 39 mm. Simultaneously, a bent pin+slider core-pulling mechanism was designed with a core-pulling stroke of at least 34 mm to realize the molding of the pipe at the bottom of the pump housing. By reasonably controlling the parting sequence and the motion sequence of the two hydraulic cylinders, successful ejection of the plastic part was achieved, which could provide a reference for the injection molding of similar plastic parts and the design of double-layer slider ejection mechanisms.
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