• Title/Summary/Keyword: Blow mold

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A study on the reduction of blow hole defects in aluminum sand casting (알루미늄 사형주조에서 기공 결함 감소를 위한 연구)

  • Lee, Dong-Youn;Lee, Chun-Kyu
    • Design & Manufacturing
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    • v.14 no.4
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    • pp.52-57
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    • 2020
  • In this study attempted to prevent defects due to blow holes among defects of sand casting products. It was intended to reduce the defect rate by reducing the blow hole of the inner surface. Currently, expectations and requirements for the quality level of non-ferrous aluminum casting in the casting industry are increasing. In addition, the shape is complex and the shrinkage precision is required. Among them, the test prototype is expensive to manufacture the mold, and the production time is also long, and the product is manufactured by sand casting. At this time, the highest defect rates are defects caused by shrinkage defects, surface defects, and blow holes.. At this study, the manufacturing time was shortened by using the shape of the fluid movement path in advance. Also, it is possible to reduce defects due to blow holes.

A numerical study on blow molding for manufacturing PET bottle consisted of single body (손잡이 일체형 PET 용기 제작을 위한 블로우 성형에 대한 수치적 연구)

  • Kim, Jong-Duck;Go, Young-Bae;Kim, Hong-Ryul;Kwon, Chang-Oh
    • Design & Manufacturing
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    • v.2 no.3
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    • pp.22-27
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    • 2008
  • Forming of PET bottle was performed by injection-stretch blow molding. Blow molding is process of contacting the dies with air of materials by pressing. In this paper, the aim was to improve reliability of technical stabilization for the PET bottle that is last productive product and process technology which was able to do maximization by a preform performance enhancement of the uniform thickness that took temperature and a characteristic of materials. Preform design and dies manufacture were conducted using injection blow molding analysis results. Therefore thickness error of 5% for PET bottle can be obtained in this paper.

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Implementation of an simulation-based digital twin for the plastic blow molding process (플라스틱 블로우몰딩 공정의 해석기반 디지털 트윈 구현)

  • Seok-Kwan Hong
    • Design & Manufacturing
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    • v.17 no.3
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    • pp.1-7
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    • 2023
  • Blow molding is a manufacturing process in which thermoplastic preforms are preheated and then pneumatically expanded within a mold to produce hollow products of various shapes. The two-step process, a type of blow molding method, requires the output of multiple infrared lamps to be adjusted individually, so the process of finding initial conditions hinders productivity. In this study, digital twin technology was applied to solve this problem. A blow molding simulation technique was established and simulation-based metadata was generated. A response surface ROM (Reduced Order Model) was built using the generated metadata. Then, a dynamic ROM was constructed using the results of 3D heat transfer analysis. Through this, users can quickly check the product wall thickness uniformity according to changes in the control value of the heating lamp for products of various shapes, and at the same time, check the temperature distribution of the preform in real time.

Effects on the process factors of blow molding affects to the PET bottle (블로우 성형공정변수가 PET 용기에 미치는 영향에 관한 연구)

  • Kim, Jong-Dug;Go, Young-Bae;Kim, Ok-Rae;Park, Hyung-Pil;Kim, Hong-Ryul;Kwon, Chang-Oh
    • Design & Manufacturing
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    • v.2 no.6
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    • pp.7-10
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    • 2008
  • Injection-stretch blowing system for preform has been developed in this study. The preforms for injection blow molding and injection stretch blow molding are being manufactured by injection molding. However it contains gate mark that affects the bottom crack in the PET bottle. The compression molded preform does not contain gate mark, thus the appearance quality of bottle has been increased and the residual stress near gate(bottom of the bottle) has been reduced. The thickness distributions, haze, and transmittance are well accepted for the preform. Also, flow characteristics of the resin between a core and cavity could be analyzed through computer simulation.

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Numerical study on the blowing deformation characteristics of a square shaped preform (사각 프리폼 블로우 성형 특성에 관한 수치적 연구)

  • Cho, Seung-Hyun;Song, Min-Jae;Lee, Dong-Won;KO, Young-Bae
    • Design & Manufacturing
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    • v.9 no.3
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    • pp.1-8
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    • 2015
  • This study presents the preform injection molding and the blow molding of the injection stretch-blow molding process for PET bottles. The numerical analysis of the injection molding and the blow molding of a preform is considered in this paper using CAE with a view to minimize the warpage and the thickness. In order to determine the design parameters and processing conditions in injection/blow molding, it is very important to establish the numerical model with physical phenomenon. In this study, we appropriately predicted the warpage, deformation and thickness distribution along the product walls.

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A Study on Manufacturing Resin-based Blow Mold using SLS Parts and Forming Prototype-car Parts (SLS 조형품을 이용한 수지형 블로우 몰드 제작 및 시작차 부품성형에 관한 연구)

  • 양화준;황보중;이석희
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.7
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    • pp.124-131
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    • 2000
  • Rapid Prototyping(RP) models are no longer used only for design verification. Currently, parts built utilizing layer manufacturing technology can be employed as functional prototypes and as patterns or tools for different manufacturing processes such as vacuum casting, investment casting, injection molding, precise casting and sand casting. This trend of Rapid Prototyping application meets the requirement of concurrent engineering and its range covers a more spreaded area. The aim of this paper is saving the manufacturing lead time and cost of plastic parts having hollow space shapes used by prototype-car. Using rapid prototype patterns, made by the Selective Laser Sintering(SLS) technique, a new approach of manufacturing resin-based blow mold is discussed. It has a great potential fur making prototype-car parts with the batch size of under 200 parts, in case of rapid modification due to a subsequent design changes in developing stage. So, the process proposed in this research shows reduction of process time and manufacturing cost when compared with the conventional process such as a Zinc Alloy fur Stamping(ZAS) mold.

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Study of Development for Multi-Cavity Preform Mold (Multi-Cavity Preform 금형시스템 개발에 관한 연구)

  • 서태일;허영무;이성희;이영훈;박용석
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.05a
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    • pp.381-388
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    • 2003
  • The paper presents our study of development for multi-cavity preform mold system which consists of hot runner system and valve gate. For this purpose, stretching blow molding process and preform injection process were simulated by Polyflow and Moldflow. Based on various results of the preform injection process analysis, process planning was established. The sectional thickness distribution of preform was optimized. Preform injection mold system was designed by these technical analysis data. Finally, 24-cavity preform mold system was successfully developed.

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Design and Economics of HVAC System for Reduction of Power Consumption in Blow Mold Machine (플라스틱 연료탱크 생산 설비에서의 소비 전력 저감을 위한 공조 시스템 설계 및 경제성 평가)

  • Lee, Youngjae;Choi, Seukcheun
    • Journal of Power System Engineering
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    • v.21 no.4
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    • pp.84-93
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    • 2017
  • This study was carried out to improve the electric power consumption of HVAC in the blow mold machine(BMM) and work environment. The experiment was conducted with the simulated HVAC system of 1/15 of the actual BMM. The temperature of main facility and two preheaters was fixed at 200 and $60^{\circ}C$ respectively in all test conditions. The measured points of temperature were chosen as critical locations considering the work environment. The tendency of temperature distributions decreases as the duct was closed to the main facility. The reduction rate of power consumption of HVAC increases up to 32.3% when both duct and cooling systems are operated. Also the efficiency of HVAC is improved about 9% through the modified design of duct system. It notes that the electric power consumption of HVAC can be reduced by the optimum design and operating condition of duct and cooling system.

Finite element analysis of a injection blow molding process for the thick-walled PET bottle (후육 벽 PET 용기에 대한 사출 블로우 성형의 유한요소해석)

  • Hong, Seok-Kwan;Song, Min-Jae;Ko, Young-Bae;Cha, Baeg-Soon
    • Design & Manufacturing
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    • v.12 no.3
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    • pp.5-12
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    • 2018
  • Plastic containers which provides the opportunity to reduce transportation costs are lighter and less brittle than glass containers. As a results, efforts to replace glass with plastic are ongoing. The blow molding method is a typical approach in producing plastic containers. Single-stage injection blow molding (ISBM) is one of the blow molding methods. However, the difficulty in controlling the temperature during the injection molding process is considered its main disadvantage. In this study, ISBM process analysis of relatively thick walled containers such as cosmetic containers is carried out. The initial temperature distribution of the preform is deemed to be the most influential factor in the accuracy of blow molding for the thick vessel. In order to accurately predict this, all heat transfer processes of the preform are considered. The validity of this analytical procedure is verified by comparing the cross-sectional thickness with the actual product. Finally, the validated analytical method is used to evaluate the factors affecting the thickness of the final molded part. The ISBM analysis technique for thick walled vessels developed through this study can be used as an effective predictor for preform design and blow process.

Development of the automatic packaging system for blow molding products (블로우 성형품 자동 패키징 시스템 개발)

  • Kim, Gun-Hee;Jung, Woo-Chul;Heo, Young-Moo;Yoon, Gil-Sang;Chang, Sung-Ho;Shin, Gwang-Ho
    • Design & Manufacturing
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    • v.2 no.2
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    • pp.15-19
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    • 2008
  • In this paper, the automatic assembly and packaging system was developed for PET blow molding products. The PET blow molding products mainly are used in groceries case and are in great demand. Generally, the molding process is compose of 4 processes such as plastic resin injection, molding, ejecting and packaging. In case of packaging process, although amount of work per hour is very large, all processes are still performed by the manual work. For this reason, the automatic packaging system was developed with the function of automatic hand-grip part assembly. For the development of system, the existing processes and the shape of molding product were analyzed and specifications were deducted. Finally, the automatic assembly and packaging system was developed and applied to the manufacturing field.

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