【摘要】 根据某新款汽车前灯总成新产品开发的需要,分别运用Maya软件构建了前灯灯罩的工业外观曲面造型,并运用UG软件对其进行了塑料件的结构设计。运用CAE分析确定了塑料件的浇注方案,采用两点热流道浇口分时顺序浇注,工艺优化后,熔接痕得到有效消除,模腔的成型工艺参数为:模温为79℃,热流道R1,R2中的料温控制为288℃,注射时间为4.2s,G2浇口延后于G1浇口0.5s开启;2段保压:75MPa/4s,60MPa/3s。冷却时间为21s,冷却水进口温度为25℃。成型模具结构为热流道两板式结构,单个模腔设置了3个独立的抽芯机构来完成塑料件难脱模特征的抽芯脱模,其中的机构S2为动模板驱动弹出式定模抽芯机构,机构利用动模的打开及在弹簧辅助力的驱动下,来驱动藏于定模板内的前模抽芯滑块,实施定模先抽芯动作;机构S3为单动力源驱动多向同步抽芯机构,机构利用模具打开时安装于定模板一侧楔紧锁紧块来驱动两个上、下层滑块同步进行抽芯,上层滑块完成一个抽芯动作,下层滑块在完成母滑块体本身抽芯动作的同时,再同步带动另一个子滑块驱动一个斜向抽芯子侧型芯来完成侧抽芯。机构及模具整体结构布置合理,可为同类塑料件的成型模具设计提供有益借鉴。更多还原

【Abstract】 According to the need of new product development of automobile headlamp assembly,Maya software was used to construct the industrial appearance surface modeling of headlamp shade,and UG software was used to design the structure of the plastic part. CAE analysis was used to determine the pouring scheme of plastic parts using two-point hot runner gate in timesharing sequence. After optimization of the process,the weld marks were effectivey elimination and the forming process parameters of the mould cavity are obtained as follows :mould temperature 79℃,material temperature in hot runner R1 and R2 is controlled at 288℃,injection time 4.2 s,the gate G2 was delayed to open at gate G1 0.5 s. Pressure holding 2 stages :75 MPa/4 s,60 MPa/3 s. The cooling time is 21 s and the inlet temperature of cooling water is 25℃. The structure of forming mould is two-plate structure with hot runner. Three independent core-pulling mechanisms are set up in a single mould cavity to complete core-pulling and demoulding of plastic part with difficult demoulding characteristics. The mechanism S2 is a pop-up core-pulling mechanism driven by a moving template. The mechanism used the opening of a moving mould and the driving force of a spring to drive the front-mould core-pulling slider hidden in a fixed template. Mechanism S3 is a multi-direction synchronous core-pulling mechanism driven by a single power source. When the mould was opened,the mechanism was installed with wedge locking block on one side of the fixed template to drive two upper and lower sliders to pull core synchronously. The upper slider completes one core-pulling action,and the lower slider completes the parent. At the same time,another sub-slider was driven synchronously to drive a side core of oblique corepulling sub-side core to complete side core-pulling. The structure of the mechanism and the overall layout of the mould are reasonable,which can provide a useful reference for the design of the forming mould of the same kind of plastic part.更多还原