Design of large injection mold for office equipment shell

doi:10.19491/j.issn.1001-9278.2024.09.018

Abstract

Abstract:

To address the problem in the existence of gate marks on the surface of a shredder shell plastic part， a hot runner mold with a complex inverted structure and a rear mold feeding mode was designed. The ejection action was completed through designing mechanical hooks. Considering the structural characteristics of the plastic parts with multiple inverted buckles surround them and internal bone positions， a four⁃sided slider splicing and core⁃pulling mechanism was designed for demolding on the lateral side of the rear mold. The back mold core was designed with multiple insert structures， which facilitated the processing， prevented the air trapping， improved the molding efficiency and quality. During the mass production， the various mechanisms of the mold operated smoothly， and the quality of the plastic parts was excellent， which could meet the requirements of design.

Key words: needle valve type hot runner, inverted mold, four side slide core extraction mechanism, mechanical hook, shredder

CLC Number:

TQ320.66⁺2

ZHUANG Yule, ZHAO Liping, QIN Ruiliang, JIANG Shangtian, SUN Guangdong, LIANG Shitian. Design of large injection mold for office equipment shell[J]. China Plastics, 2024, 38(9): 107-111.

Figures/Tables 8

Fig. 1. Structure diagram of plastic parts

Fig.2. 3D diagram of feeding glue

Fig.3. 3D diagram of core extraction structure of four⁃side slider

Fig.4. 3D schematic diagram of mechanical pull state

Fig.5. 3D schematic diagram of exhaust system

Fig.6. Schematic diagram of cooling water system

Fig.7. 3D diagram of mold assembly

Fig.8. Schematic diagram of the point analysis of the commissioning problems

References 12

1	曹国忠，刘孟然，万子薇.基于进化树的碎纸机刀具变型设计［J］.机械设计，2019，36（10）：121⁃126.
	CAO G Z， LIU M R， WAN Z W. Variant design based on the evolutionary tree of shredder knife ［J］. Journal of mechanical design， 2019， 36 （10）： 121⁃126.
2	傅莹龙，张留伟，叶星辉，等.基于SVG与CAE技术的汽车副仪表板倒装模具设计［J］.塑料工业，2023，51（02）：55⁃61.
	FU Y L， ZHANG L W， YE X Het al. Design of flip mold for automobile sub⁃instrument panel based on SVG and CAE technology ［J］. Plastics Industry，2023，51（02）：55⁃61.
3	孙令真，詹建新.基于定模斜顶的倒装塑料模具结构设计［J］.塑料，2021，50（05）：56⁃60+66.
	SUN L Z， ZHAN J X. Structure design of flip plastic mold based on fixed die inclined top ［J］. Plastics， 2019，50（05）：56⁃60+66.
4	陈剑玲.内螺纹瓶盖自旋脱模的热流道倒装注塑模设计［J］.工程塑料应用，2022，50（03）：106⁃112.
	CHEN J L. Design of hot runner flip injection mold for inner screw cap spin⁃release ［J］. Application of Engineering Plastics，2022，50（03）：106⁃112.
5	蔡厚道，王训杰，陈云，等.汽车马鞍盖板滑块斜顶机构热流道注塑模具设计［J］.塑料工业，2023，51（08）：86⁃91.
	CAI H D， WANG X J， CHEN Y， et al. Design of hot runner injection mold for inclined top mechanism of car saddle cover slider ［J］. Plastics Industry，2023，51（08）：86⁃91.
6	赵利平，侯贤州，秦瑞亮，等.含字符按键的双色塑件的注塑模设计［J］.中国塑料，2023，37（03）：98⁃102.
	ZHAO L P， HOU X Z， QIN R L， et al. Injection mold design of two⁃color plastic parts with character keys ［J］. China Plastics，2023，37（03）：98⁃102.
7	赵利平，温煌英，罗哲，等.汽车灯饰面盖零件热流道双色注塑模具设计［J］.工程塑料应用，2022，50（03）：96⁃100.
	ZHAO L P， WEN H Y， LUO Z， et al. Design of two⁃color injection mold for hot runner for automotive lighting cover parts ［J］. Application of Engineering Plastics，2022，50（03）：96⁃100.
8	张维合，邓成林，张艳华，等.汽车C柱左下护板顺序阀热流道倒推注塑模设计［J］.中国塑料，2022，36（12）：127⁃132.DOI：10.19491/j.issn.1001-9278.2022.12.018 .
	ZHANG W H， DENG C L， ZHANG Y H， et al. Car C column bottom left guard sequence valve push pour hot runner injection mold design ［J］. China plastics， 2022， 36 （12）： 127⁃132.
9	华丽霞，刘沛龙，郭兴.童车骨架热流道注塑模设计［J］.工程塑料应用，2022，50（04）：81⁃86.
	HUA L X， LIU P L， GUO X. Injection mold design of hot runner for baby carriage frame ［J］. Application of Engineering Plastics，2022，50（04）：81⁃86.
10	赵利平.基于热流道技术的后视镜基座注塑模设计［J］.塑料，2018，47（05）：96⁃99.
	ZHAO L P. Injection mold design of rearview mirror base based on hot runner technology ［J］. Plastics，2018，47（05）：96⁃99.
11	范玉，范佳琦，黄继战，等.透光窗控制器面板倒装双色热流道注塑模具设计［J］.工程塑料应用，2023，51（11）：90⁃95.
	FAN Y， FAN J Q， HUANG J Z， et al. Design of injection mold for inverted two⁃color hot runner for light transmission window controller panel ［J］. Engineering Plastics Application，2023，51（11）：90⁃95.
12	赵利平，张维合，彭新华.汽车座椅侧护板注塑模具创新设计［J］.中国塑料，2023，37（10）：139⁃143.DOI：10.19491/j.issn.1001-9278.2023.10.019 .
	ZHAO L P， ZHANG W H， PENG X H. Car seat injection mold side guard innovation design ［J］. China plastics， 2023， 5 （10）： 139⁃143. The DOI： 10.19491/j.i SSN. 1001-9278.2023.10.019 .