基于Moldflow的 90° 大弧弯管注塑模具设计

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Design of injection mould for 90∘ large arc bending pipe based on moldflow

WAN Qiong'， YAN Ge， ， JIA Xiongweil * （1. School of Mechanical and Electrical Engineering， Xi'an Traffic Engineering Institute， Xi'an 710300，Shaanxi， China; 2.Linhai Weixing New Building Materials Co. Ltd.，Taizhou 318ooo， Zhejiang， China）

Abstract： Aiming at the characteristics of uneven wall thickness and difficult demoulding of a 90∘ large curved pipe，a set of one mold and one cavity mold with curved core pulling mechanism of inclined guide column is designed. In order to improve the quality of plastic parts，Moldflow software was used to analyzed the filling time， flow front temperature，fuse connection，cavitation，cooling water temperature，warping deformation amount，etc.，The results show that the cooling system was reliable and relevant injection molding process parameters were obtained，that is，melt temperature of 190∘C and injection time of 3s . The pressure holding time is 10s ，the clamping force is larger than 22.65t ，and the cooling water temperature is 25∘C . Secondly， the mold structure is designed. It mainly includes the selection of parting surface， the design of pouring system， the design of cavity and the design of side core-puling mechanism. Because it is difficult to pull out the core of plastic parts，a curved core puling mechanism composed of inclined guide post， slide block，connecting rod， slide block seat and press plate is used to realize the side core-pulling of 90∘ high arc bend pipe. Through the analysis of Moldflow software，the mold structure can be optimized to improve the molding quality of plastic products.

Key words： 90∘ large arc bend pipe; plastics; mold design; side core-pulling; forming analysis

0 引言

塑料弯管成型时有以下难点： ① 与自身性质有关的，如弯曲弧度，弧度越大，弯管内壁脱模越困难； ② 与管内附加有关的，如倒扣等，让脱模困难； ③ 内管成型冷却，其结构导致内外冷却速度不一致[1-2]

关于弯管成型结构，已有一些研究，如赵利平等[3以汽车油箱连接管为研究对象，采用三种不同的抽芯方式，分别为斜导柱侧抽芯机构、二次侧向移动滑块抽芯机构和一次侧向滑块加一次油缸驱动曲柄旋转侧抽芯机构，解决了出模方向多向倒扣及狭长 90∘ 圆弧倒扣的脱模难题。（剩余6604字）