Study on Automatic Parting Design Technology of Injection Mold

doi:10.19491/j.issn.1001-9278.2020.12.009

Abstract

Abstract:

The current research status of the design technology of parting molds was analyzed by combination of the practical knowledge and experience of the parting mold design of injection mold. Aiming at the shortcomings of the current parting mold design system and the actual needs of manufactures， an automatic recognition algorithm for the parting line of the mold and an automatic generation algorithm for the specific blocks of the mold were proposed. Based on the NX platform， an automatic parting mold design system was developed. This system is not only easy to operate but also can reduce the dependence on the experience and knowledge of designers. The obtained example indicated that this system had high practicability and could greatly improve the design efficiency.

Key words: solid parting, parting mold design, parting line, ray detection, mold design

CLC Number:

TQ320.66⁺2

WANG Jing , ZHOU Laishui , LI Peng, BI Jianping , LIU Jun. Study on Automatic Parting Design Technology of Injection Mold[J]. China Plastics, 2020, 34(12): 53-58.

Figures/Tables 15

Fig.1. Schematic diagram of parting structure

Fig.2. Basic principle of solid parting method

Fig.3. Automatic parting design system flow

Fig.4. Internal and external parting line of plastic parts

Fig.5. Identification of parting line by ray detection

Fig.6. Algorithm flow of parting line identification

Fig.7. Plane drop parting line

Fig.8. Generation of die volume block for plane drop parting line

Fig.9. Algorithm flow of automatic generation of mould volume block

Fig.10. Automatic parting dialog box

Fig.11. Structural drawing of plastic parts

Fig.12. Parting line generation

Fig.13. Volume block generation

Fig.14. Parting results

设计方法

耗时/min

对设计人员

经验水平要求

Tab.1. Operation comparison table

References 14

1	PRITAM C， Venkata N.Automatic Determination of Parting Directions， Parting Lines and Surfaces for Two⁃Piece Permanent Molds［J］. Journal of Materials Processing Technology，2009，209（5）：2 464⁃2 476.
2	LI G M，FANG H，ZHENG L X，et al. Research on Optimal Design of The Injection Mold Parting Direction Based on Preference Relation［J］.International Journal of Advanced Manufacturing Technology，2015，79（5/8）：1 027⁃1 034.
3	CHEN Y H，WAMG Y Z，LEUNG T M.An Investigation of Parting Direction Based on Dexel Model and Fuzzy Decision Making［J］.International Journal of Production Research，2000，38（6）：1 357⁃1 375.
4	GUO B S，CHENG X S，DAI N，et al. Determination of Parting Line for NC Machining of Mesh Surface［J］. Machine Design and Manufacturing Engineering，2015（5）：6⁃10.
5	LI W S，MARTIN R R，LANGBEIN F C.Molds for Meshes： Computing Smooth Parting Lines and Undercut Removal［J］.IEEE Transactions on Automation Science and Engineering，2009，6（3）：423⁃432.
6	周振勇，高曙明，顾正朝，等.注塑模设计中分型线的自动确定［J］.计算机辅助设计与图形学学报，2000，12（7）：512⁃516.
	ZHOU Z Y， GAO S M， GU Z C，et al. Automatic Determination of the Parting Line in Injection Mold Design［J］. Journal of Computer⁃Aided Design & Computer Graphics，2000，12（7）：512⁃516.
7	涂小文，索庆栋，娄臻亮.注塑模具分型线自动搜索技术研究［J］.机械科学与技术，2003，22（6）：865⁃868.
	TU X W， SUO Q D， LOU Z L. On Automatic Searching of the Parting Line in Injection Mold Design［J］. Mechanical Science and Technology，2003，22（6）：865⁃868.
8	HAN J W， JIAN B， YAN G R， et al. Discretization Approach Using Ray⁃Testing Model in Parting Line and Parting Surface Generation［J］.Chinese Journal of Mechanical Engineering，2007， 20（1）： 47⁃54.
9	FU M W， NEE A Y C， FUH J Y H.The Application of Surface Visibility and Moldability to Parting Line Generation［J］.Computer⁃Aided Design，2002，34（6）：469⁃480.
10	FU M W，FUH J Y，NEE A Y.Core and Cavity Generation Method in Injection Mould Design［J］.International Journal of Production Research，2001，39（1）：121⁃138.
11	韩建文，闫光荣，雷毅.射线探测法在模具CAD自动化分模中的应用［J］.计算机辅助设计与图形学学报，2006，18（7）：952⁃958.
	HAN J W，YAN G R，LEI Y. Ray⁃Test Approach to Identify Surface Visibility for Parting line Generation［J］. Journal of Computer⁃Aided Design & Computer Graphics，2006，18（7）：952⁃958.
12	吴盛金，刘斌.注塑模具自动分模技术［J］.塑料工业，2010，38（5）：47⁃50.
	WU S J，LIU B. Automatic⁃mould Parting Technology of Injection Mold［J］. China Plastics Industry，2010，38（5）：47⁃50.
13	张朴.注塑模具分模方法的研究与应用［J］.模具技术，2017（1）：34⁃36.
	ZHANG P.Research and Application of Injection Mould Parting Methods［J］.Die and Mould Technology，2017（1）：34⁃36.
14	孔垂品，牛强，柳伟，周雄辉.模具零件的最小包围盒生成算法［J］.模具工业，2014（4）：15⁃18.
	KONG C P， NIU Q， LIU W，et al.Generation Algorithm of Minimum Bounding Box for Die and Mould Components［J］.Die & Mould Industry，2014（4）：15⁃18.

[1]	WANG Zhigang, YANG Bo, LI Zhi, PENG Guoping, JIANG Zaijia, LI Guanbao. Study on Correlation Between Process Defect and Mechanical Properties of Polyethylene Pipe Elector⁃fusion Joints [J]. China Plastics, 2021, 35(9): 64-68.
[2]	Hong YANG. Moldflow⁃based Optimization Analysis and Die Design of UAV Upper Cover [J]. China Plastics, 2020, 34(6): 92-99.
[3]	ZHAO Zhanfeng. Mold Design of Automobile Handle Based on GAIM CAE Optimization [J]. China Plastics, 2020, 34(3): 78-84.
[4]	WANG Jing, LIU Xuemin, CUI Yubo. Design of Injection Mold for Plastic Parts with Dense Shaped Holes [J]. China Plastics, 2020, 34(11): 81-85.
[5]	. Design of Secondary Core-pulling Mechanism and Simplified Four-time Opening Three-platemould for Slider in Medicine Transit Box [J]. China Plastics, 2019, 33(8): 118-126.
[6]	TANG Dingde, TIAN Ke. Design of Simplified Mold with Special Three-step Demolding Mechanism for Blade of Unmanned Aerial Vehicle [J]. China Plastics, 2019, 33(12): 80-88.
[7]	. Design of Combined Cavity Injection Mold for Small-size Plastic Parts [J]. China Plastics, 2018, 32(11): 125-130.
[8]	. Reverse Engineering Modeling and Mold Design of Handle Back Cover of Hair Dryer [J]. China Plastics, 2018, 32(11): 131-135.
[9]	. Application of CAE Technology in Mold Design of Car Engine Hood [J]. China Plastics, 2017, 31(7): 132-136 .
[10]	. On-line Test Technique for PVT Property of Polymer Materials and Its Application in Mold Design [J]. China Plastics, 2016, 30(07): 57-61 .
[11]	. Application of CAE in Injection Mould Parting Surface Compensation [J]. China Plastics, 2016, 30(05): 82-86 .
[12]	. Injection Mold Design of Motor Canteen Rear Covers with Threads [J]. China Plastics, 2016, 30(03): 109-112 .
[13]	. Design of the Injection Mold for a Wall Speaker Covers Based on Moldflow Technologies [J]. China Plastics, 2010, 24(06): 97-101 .
[14]	XIANG Hui-Yu. Anti-warpage Gate Design Analysis for Plastic Injection-molding of a Long-armed PBT lamp Holder [J]. China Plastics, 2009, 23(04): 61-63 .