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《工程塑料应用》 2021年第08期
DOI:10.3969/j.issn.1001-3539.2021.08.014
180º弯管塑件的抽芯机构及注塑模设计
肖国华
浙江工商职业技术学院,浙江宁波 315012 
Design of Injection Mould and Core-pulling Mechanism of 180º Bend Pipe
Xiao Guohua
Zhejiang Business Technology Institute, Ningbo 315012, China 
摘要:设计了一种带180º弯管抽芯机构的两板1模1腔注塑模具。模具中,针对弯管塑件180º弯管内壁的脱模难题,将180º弯管内壁的弯管型芯分割成2组、每组设置3个短圆弧成型块,抽芯时2组圆弧成型块分别从塑件180º弯管的两端抽出,每端抽出1组3个成型块,2组圆弧成型块同步抽出,同组内的3个圆弧成型块则分3次依次抽出,单组内3个圆弧成型块的抽芯驱动力由1根可变形钢索提供。当模具打开开始抽芯动作时,由油缸驱动抽芯机构的3个滑块,将塑件弯管内壁中的2组圆弧成型块、弯管两端端部的2个直管型芯分3步抽出:第1步,由第1个滑块驱动弯管两端端部直管型芯进行抽芯;第2步,由第2个滑块上的2根预弯变形钢索分别将2组3个圆弧成型块依次抽出;第3步,由第1个滑块驱动第2,3个滑块继续抽芯,将所有的弯管内壁成型件从弯管塑件内壁中抽出,从而实现180º弯管塑件的完全脱模。  
Abstract:A two-plate injection mould with one mould and one cavity and a 180º bend pipe core-pulling mechanism was designed. In the mould, aiming at the problem of demoulding the inner wall of 180° bend pipe plastic part, the bend pipe core of the inner wall of the 180º bend pipe was divided into two groups, and each group was equipped with three short arc-shaped forming blocks. The two groups of arc-shaped forming blocks were drawn out from both ends of the 180º bend pipe during core pulling, each group of three forming blocks were drawn out from each end, the two groups of forming blocks were drawn out simultaneously, and the three forming blocks in the same group were drawn out in three times in sequence, the driving force for the core pulling of the three forming blocks in a single group was provided by a deformable steel cable. When the mould was opened and the core pulling action began, the three sliders of the core-pulling mechanism were driven by the hydraulic-cylinder, and the two groups of short arc-shaped forming blocks in the inner wall of the bend pipe and the two straight pipe cores at both ends of the bend pipe were drawn out by the three sliders in three steps. In the first step, the core pulling of straight pipe cores at both ends of the bend pipe was realized by the first slider; in the second step, each groups of three arc-shaped forming blocks were drawn out in sequence from the two pre-bent deformed steel cables on the second slider; in the third step, the second and third sliders were drove by the first slider to continue core pulling together, and all inner wall forming parts were removed from the inner wall of 180° bend pipe, which realized the complete demoulding of 180° bend pipe.  
关键词:180º;;弯管;抽芯机构;脱模;模具设计;注塑;结构 
Keywords:180° bend pipe; core-pulling mechanism; demoulding; mould design; injection; structure 
本文引用格式:
肖国华.180º弯管塑件的抽芯机构及注塑模设计[J].工程塑料应用,2021,49(8):81-86.
Xiao Guohua. Design of injection mould and core-pulling mechanism of 180º bend pipe[J]. Engineering Plastics Application,2021,49(8):81-86. 

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