Design of fixed demoulding injection mould with sequential valve gating hot runner for door cladding under C⁃pillar of car

doi:10.19491/j.issn.1001-9278.2022.12.018

Abstract

Abstract:

According to the structural characteristics of the door cladding under C⁃pillar of car， a thin⁃wall injection mold with a sequential valve gating （SVG） hot runner was designed. The appearance of the molded plastic part meets the design requirement by employing the mold structure of the outer surface formed by the dynamic mold and the inner surface formed by the fixed mold. The demoulding problem with a large area， a large force and a large inclination angle of inclined top core pulling was solved by using a double guide rod and an auxiliary rod inclined top lateral core pulling mechanism. The mold adopted a temperature control system based on the straight through water pipe， inclined water pipe， and spacer well， which is close to the shaped water path. The water path was evenly arranged， the mold cooling was balanced and sufficient， the injection cycle was shortened by about 15 %， and the molded plastic parts reached a dimensional accuracy matching the standard of MT3 （GB/T 14486—2008）.

Key words: door cladding under C?pillar of car, hot runner with sequential valve gating, fixed mold demoulding, oblique rod with double guide rod, oblique rod with auxiliary rod

CLC Number:

TQ 320.66⁺2

ZHANG Weihe, DENG Chenglin, ZHANG Yanhua, XU Yonglin. Design of fixed demoulding injection mould with sequential valve gating hot runner for door cladding under C⁃pillar of car[J]. China Plastics, 2022, 36(12): 127-132.

Figures/Tables 7

Fig.1. Side door panel of the car

Fig.2. Door cladding under C⁃pillar of the car

Fig.3. Injection mold schematic of door cladding under C⁃pillar of the car

Fig.4. 3D graph of the mould

Fig.5. 2D graph of the side core pulling mechanism

Fig.6. 3D graph of the side core pulling mechanism

Fig.7. The temperature control system of the injection mold

References 9

1	张维合.注射模具设计实用手册［M］.北京：化学工业出版社，2011：112⁃177.
2	张维合.汽车注塑模具设计要点与实例［M］. 北京：化学工业出版社，2016：23⁃45.
3	张维合. 基于顺序阀热流道技术汽车导流板注射模设计［J］.塑料科技，2018，46（12）： 100⁃105.
	ZHANG W H. Design of injection mold based on SVG hot runner for automobile deflector［J］. Plastic Science and Technology，2018，46（05）： 100⁃105.
4	张维合.汽车前门地图袋低压双层注塑模设计［J］. 塑料工业，2017，45（06）：60⁃65.
	ZHANG W H.Design of low ⁃ pressure double ⁃ layer injection mold for deckel fuer tuerablagekasten of car［J］. China Plastics Industry，2017，45（06）：60⁃65.
5	万鹏程.汽车保险杠注射模浇注系统设计与成型参数优化［M］.昆明理工大学出版社，2011：58⁃75.
6	沈忠良，郑子军，肖国华，等.汽车中控面板IMD成组模具设计［J］. 工程塑料应用，2017，45（01）：70⁃75.
	SHEN Z L， ZHEN Z J， XIAO G H，et al.Design of IMD group mould for central control panel in automobile［J］.Engineering Plastics Appication，2017，45（01）： 70⁃75.
7	张维合. 汽车中央装饰件顺序阀热流道二次顶出注塑模设计［J］. 工程塑料应用，2018，46（7）：87⁃91.
	ZHANG W H. Design of injection mold of SVG and secondary ejection for automotive central decoration［J］. Engineering Plastics Appication，2017，46（7）： 87⁃91.
8	张维合. 汽车后背门护板热流道大型注塑模设计［J］.中国塑料，2019，33（05）：102⁃108.
	ZHANG W H. Design of large and hot runner injection mold for the rear door of automobile［J］.China Plastics，2019，33（05）：102⁃108.
9	张维合.汽车手套箱注塑模设计［J］. 现代塑料加工应用，2015，27（4）：54⁃57.
	ZHANG W H. Design of large injection mold for car handschuhkasten［J］.Modern Plastics Processing and Applications，2019，33（5）：102⁃108.

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