• 제목/요약/키워드: Mold Parts

검색결과 636건 처리시간 0.032초

高密度 폴리에틸렌 材料의 再活用 混合比가 成形品에 미치는 影響 (The Effect on Recycled resin Ratio of High Density Polyethylene on the Molded Parts)

  • 강태호;김인관;김영수
    • 자원리싸이클링
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    • 제13권5호
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    • pp.23-27
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    • 2004
  • 플라스틱 중에서 열가소성 수지는 재활용이 가능하지만 재활용 수지에 대한 균일한 물성의 신뢰성이 부족하기 때문에 제한적으로 사용되고 잇다. 정확한 재활용의 정도에 따른 물성을 파악하여 사용 범위를 규정하는 것은 제한된 자원을 효율적으로 사용할 수 있는 중요한 방법이라 하겠다. 본 연구는 고밀도 폴리 에틸렌(HDPE)을 대상으로 재활용의 정도에 따른 물성의 변화를 실험적으로 수행하였다. 재활용을 하지 않은 수지와 재활용 수지를 중량비를 기준으로 혼합하여 실험을 수행하였으며 기계적인 물성의 변화를 측정하였다.

MoldFlow를 이용한 신발 사출금형 러너부 형상 최적화 (Shoemoulds Runner Shape Optimization using MoldFlow)

  • 류미라;서영백;문병주;박흥식
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.1483-1486
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    • 2003
  • Injection mold is a manufacturing process used to produce the various parts of complicated shape at a low cost. Many factors such as, section shape, resin and mold temperature, filling time, etc, affect on the quality of injection part during injection molding process. The precent study, was carried out the shrinkage analysis of shoes injection mold to optimize runner shape based on filling and packing pressure with MoldFlow. Taguchi design and analysis of variance are used to optimize injection mold design.

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

  • 양화준;황보중;이석희
    • 한국정밀공학회지
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    • 제17권7호
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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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T자형 단면형상을 가진 성형품의 싱크마크 불량 감소 방안에 대한 연구 (A study on the reduction method of sink marks for plastic products with T-shape)

  • 김다은;이춘규
    • Design & Manufacturing
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    • 제12권2호
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    • pp.22-26
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    • 2018
  • In the automotive industry these days, plastic parts have been developed and replaced with plastic parts by maintaining the same function of existing press parts for a variety of reasons. Injection molding plastic parts are subject to molding defects due to various factors, among which the sink marks usually occur in the areas where bosses and ribs are installed. In this study, we analyzed the influence of various factors on the occurrence of sink marks by using the flow analysis of the forming analysis program(Moldflow analysis) using the rib model with the T-shape. Tests have shown that the greatest influence on the sink mark of cosmetic products is the thickness and pressure of the ribs, and the thickness of the basic moulding thickness of the product increases. However, it was considered that the resin temperature and the mold temperature do not greatly affect the occurrence of the sink mark.

플라스틱 중공부품의 일체화 성형을 위한 인몰드 펀칭 공정기술에 관한 연구 (A study on the technology of in-mold punching process for integrated hole piercing of plastic hollow parts)

  • 이성희
    • Design & Manufacturing
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    • 제15권4호
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    • pp.1-7
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    • 2021
  • A study on in-mold punching technology for hole piercing during molding of hollow plastic parts was conducted. Considering the non-linearity of the HDPE plastic material, mechanical properties were obtained according to the change in temperature and load speed. A standard specimen for the in-mold punching test was designed to implement the in-mold punching process, and the specimen was obtained through injection molding. In order to analyze the influence of process variables during in-mold punching, an in-mold punching mold capable of controlling variables such as temperature and support pressure of the specimen was designed and manufactured. Mold heating characteristics were confirmed through finite element analysis, and punching simulations for changes in process conditions were performed to analyze punching characteristics and reflected in the experiment. Through simulations and experiments, it was found that the heating temperature, punch shape, punching speed, and pressure of the back side of the specimen were very important during in-mold punching of HDPE materials, and optimal conditions were acquired within a given range.

다수캐비티 사출금형에서 충전 불균형이 성형 품질에 미치는 영향 (The Effect of Filling Imbalances on the Molding Quality in the Multy-Cavity Injection Mold)

  • 한동엽;정영득
    • Design & Manufacturing
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    • 제7권1호
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    • pp.1-6
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    • 2013
  • The injection molding process is a predominant method for producing plastic parts. In order to maximize productivity and molding quality in a injection mold, it is important that each cavity in a multi-cavity injection mold is identical. This requires that cavity dimensions should be identical and delivery system of melt to each cavity have to be the same. Despite the geometrically balanced layout in multi-cavity injection mold more than 4 cavities, it has been observed that the filling in each cavity results in imbalances. Most of cases, this phenomenon of filling imbalances have a bad effect on dimension accuracy, warpage, molding appearance and strength of molding parts. In this study, experiment were conducted to investigate the effect of filling imbalances on the molding quality(surface gloss, shrinkage, tensile strength) in the multy-cavity injection mold.

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다수 캐비티를 갖는 3매 구성형 사출금형에서의 충전 불균형 (Filling Imbalance in 3 Plate Type Injection Molds with Multi-Cavity)

  • 제덕근;정영득
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.752-755
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    • 2003
  • Injection molding is the one of the most important processes for mass production of plastic parts. Usually Injection molds for mass production are constituted to multi-cavity runner system to manufacture the more parts at a time. To uniformly fill to each cavity, multi-cavity molds are designed to geometrically balanced runner system. However. in practice this is not the case. The previous studies by Beaumount at.[2] reported that filling imbalance occurred by thermal unbalance on the mold and viscosity variation of resins and so on. In this study, we conducted experiments in order to know the causes or filling imbalance for 3 plate type mold with 8 cavities. We presented a new so called 4BF mold(4plate Type Balanced Filling Mold) to improve filling balance. We conducted a experimental injection molding to verify a efficiency of the 4BF mold. In the results of the experiment, We could confirmed the possibility of the 4BF mold.

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Development of Sleeve Parts for Continuous Hot Zinc Plating Roll Applied to Wear-Resistant Alloy Cast Steel

  • Park, Dong-Hwan;Hong, Jin-Tae;Kwon, Hyuk-Hong
    • 한국생산제조학회지
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    • 제26권4호
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    • pp.357-364
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    • 2017
  • Metal casting is a process in which molten metal or liquid metal is poured into a mold made of sand, metal, or ceramic. The mold contains a cavity of the desired shape to form geometrically complex parts. The casting process is used to create complex shapes that are difficult to make using conventional manufacturing practices. For the optimal casting process design of sleeve parts, various analyses were performed in this study using commercial finite element analysis software. The simulation was focused on the behaviors of molten metal during the mold filling and solidification stages for the precision and sand casting products. This study developed high-life sleeve parts for the sink roll of continuous hot-dip galvanizing equipment by applying a wear-resistant alloy casting process.

절삭가공 시 설계, 가공, 측정을 융합한 MES 시스템 구축에 관한 연구 (A study on the establishment of an MES system that converges design, processing, and measurement during cutting)

  • 박해웅;이승욱;한희봉;윤재웅;최계광;한성렬;김경아;이춘규
    • Design & Manufacturing
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    • 제15권2호
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    • pp.42-48
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    • 2021
  • In this paper, when manufacturing large/multi-mold parts (more than 30 core parts),A mold manufacturing (tolerance) management system was established through design-processing linkage.The mold manufacturing (tolerance) management system is a design-based measurement shape/measurement position determination system, M/C processing-linked measurement drive system,It is composed of four parts: CAD-linked measurement result analysis system and manager mold part quality management system.In addition, the constructed system was applied to the field and the effect of system construction was evaluated by comparing it with the existing process.As a result of the evaluation, the measurement precision is within 0.02mm, and the time it takes to measure after the end of processing is shorter than that of the existing process.(12 hours → 2 hours) It was shortened to 16.7%.In addition, it was confirmed that the time required for reprocessing after measurement was reduced by 25% (4 hours → 1 hour) compared to the existing process.

시작차용 의장부품 성형을 위한 하이브리드 림 몰드 개발 (Development of Hybrid RIM Mold to Form Outfit-part for Prototype-cars)

  • 양화준;황부중;이석희
    • 한국정밀공학회지
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    • 제18권3호
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    • pp.75-83
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    • 2001
  • RIM(Reaction Injection Molding) is a widely used method to manufacture middle-large size outfit-part for a prototype car. The main advantage of RIM is the capability of manufacturing a small number of prototype parts with less cost and lead time than injection molding which is the most popular method to manufacture plastic parts. Generally, epoxy resin and RTV(Room Temperature Vulcanization) silicon are used as mold materials for RIM, and the selection of mold materials is usually depended upon the industrial environment of manufactures and it decides overall mold making process and part quality. This paper suggests a new mold making process by consolidating the advantages of epoxy resin and RTV silicon based RIM mold to enhance the parts quality while reducing the manufacturing cost and time and shows the competitiveness of the suggested process compared with conventional methods.

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