• Title/Summary/Keyword: Mold industry

검색결과 363건 처리시간 0.025초

습식워터젯을 채용한 초정밀 절삭 가공시스템의 특허동향조사에 관한 연구 (Research for Patent Application Tendency in the Super Fine Machining System Using the Wet Waterjet)

  • 김성민;고준빈;박희상
    • 한국공작기계학회논문집
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    • 제18권1호
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    • pp.1-12
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    • 2009
  • Presently, the semiconductor industry has the chronic problem. In the semiconductor industry, it has the semiconductor wafer, a package, the optical filter cut by using the saw blade, the mold, a laser etc. The cutting technique has the difficulty due to the rising of the production cost by the wearing of mold, the poor quality problem due to generated heat at the moment of cutting procedure and curve cutting etc. The goal of this time of national research and development project is develop the apparatus for solving the problem that the existing cutting technique has. The technology is so called waterjet abrasive method. This technology will be mainly applied to cut a semiconductor package and a wafer. Two important things to be considered are ripple effect(in other words, the scale of a market) and simplicity of an application.

Pulp Mold as a Packaging Material for Maintaining the Freshness of Fruits and Vegetables

  • Won, Jong-Myoung;Song, Che-Yun
    • 한국펄프종이공학회:학술대회논문집
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    • 한국펄프종이공학회 2006년도 PAN PACIFIC CONFERENCE vol.2
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    • pp.455-458
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    • 2006
  • The oak and pine charcoal were used to develop the internal packaging raw material for maintaining the freshness of vegetables and fruits, and to investigate the possibility in the application for pulp mold packaging. The effects of the charcoal type, species, particle size, and grammage on the adsorption efficiency of ethylene gas were studied. White charcoal has superior ethylene gas adsorption performance to those of black charcoal. Pine charcoal was superior to oak charcoal in the ethylene gas adsorption. Higher gas adsorption was obtained by the higher grammage sheet. The difference in the adsorption efficiency was not significant between ONP and KOCC.

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중소 금형업체 협업지원을 위한 핵심 제조역량 평가 모델 개발 (Assessment Model of Core Manufacturability to Promote Collaboration of Small and Medium Sized Mold Companies)

  • 신문수;이상일;류광열;주재구
    • 산업공학
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    • 제25권1호
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    • pp.52-63
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    • 2012
  • Up-to-date enlargement of the scale of global outsourcing has brought about the need of systematic and efficient tools for competitive supplier discovery located in various areas. A web-based business supporting system, referred to as Excellent Manufacturer Scouting System(EMSS), is being developed to serve core business functions including supplier discovery, negotiation, and collaboration between overseas buyers and domestic suppliers throughout the process of supply chain formation. In this paper, a supplier assessment model devoted to evaluation of core manufacturing capability is proposed by targeting small and medium sized mold companies. The assessment model will eventually be loaded to EMSS. Even if many well-designed models for supplier assessment have been presented in literature, most of them limit the evaluation criteria to somewhat general information on a given supplier, such as cost, delivery time, quality, rather than core manufacturing capability itself. This research is pioneering work on supplier assessment from the viewpoint of manufacturability. The proposed assessment model classifies assessment indices into six criteria, which have been drawn by intensive survey and analysis of the mold industry. Actual assessment indices for each criterion are also presented along with an exemplary evaluation result.

초지법에 따른 한지의 물성비교 (Comparison of Physical Properties of Hanjis Made by Different Sheet Forming Processes)

  • 최태호;조남석;최인호;정택상
    • 펄프종이기술
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    • 제33권4호
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    • pp.21-27
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    • 2001
  • Korean traditional paper (Hanji) making technology has adopted two kinds of sheet forming processes, which called "Oebal-choji": and "Ssangbal-choji". The sheet forming process of Oebal-choji is an original method developed in Korea. At first, paper stock is dipped onto the mold and flow away in the forward direction. Then, paper stock is scooped again and rhythmically rocked from side to side, this work is repeated several times. Through this operation the fibers intertwine and paper layers are formed. Ssangbal-choji is almost same as the Nagashizuki, which used in Japan. In this method, paper stock is scooped onto the mold and rhythmically rocked backwards and forwards several times, the water drains slowly through the bamboo screen and then sheet is formed. Tamezuki method is used in Japan and China. This is a method in which the mold is dipped into the paper stock once and left to drain. In the Ssangbal-choji and Nagashizuki methods, the most of excess solution is cast out while in the Tamezuki all of it is allowed to drain through the mold. This study was carried out to investigate the physical properties of the Hanjis that were made by Oebal-choji, Ssangbal-choji, Nagashizuki, and Tamezuki sheet forming processes. The results were follows; Physical properties of the Oebal-choji Hanji were better than those of Ssangbal-choji, Nagashizuki, and Tamezuki. Oebal-choji Hanji made little difference of paper strength between MD and CD, but Ssangbal-chjo and Nagashizuki Hanjis made wide difference. And there are no difference of paper strength between MD and CD on the Tamezuki Hanji. On the confocal laser scanning microscopy (CLSM) observation of the Hanjis, Oebal-choji made well crossed fiber orientation than those of other forming processes.r forming processes.

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Use of Wastepaper for Developing Environment-friendly Shock-absorbing Materials

  • Kim, Chul-Hwan;Song, Dae-Bin;Lee, Young-Min;Kim, Jae-Ok;Kim, Gyeong-Yun;Shin, Tae-Gi;Park, Chong-Yawl
    • 한국펄프종이공학회:학술대회논문집
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    • 한국펄프종이공학회 2006년도 PAN PACIFIC CONFERENCE vol.2
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    • pp.471-474
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    • 2006
  • Environment-friendly shock-absorbing materials were made of wastepaper such as old corrugated containers (OCC) and old newspapers (ONP) with a vacuum forming method. The plate-like cushioning materials made of OCC and ONP respectively by vacuum forming showed superior shock-absorbing properties with lower elastic moduli compared to expanded polystyrene (EPS) and pulp mold. Even though the plate-like materials had many free voids in their fiber structure, their apparent densities (${\approx}0.1g/cm^{3}$) were a little higher than that of EPS (${\approx}0.03g/cm^{3}$) and much lower than that of pulp mold (${\approx}0.3g/cm^{3}$). However, the elastic moduli of the cushioning materials made of wastepaper were much lower than that of EPS or pulp mold. This finding implies that the cushioning materials made of OCC fibers containing more lignin than ONP show better shock-absorbing properties than ONP Moreover, the cushioning materials made of OCC and ONP respectively showed greater porosity than pulp mold. The addition of cationic starch to the cushioning materials contributed to an increase in the elastic modulus to the same level as that of EPS. Furthermore, the deterioration in fiber quality by repeated use of wastepaper played a great role in improving shock-absorbing ability.

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Feedstock 종류에 따른 금속분말사출성형 유동특성 분석을 위한 실험적 연구 (An Experimental Study on Rheological Characteristics of Metal Injection Molding by Feedstock Material)

  • 정무철;허영무;신광호;윤길상;장성호;이정원
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2009년도 추계학술대회 논문집
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    • pp.57-61
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    • 2009
  • In recently industry, with the miniaturization and high-precision of machine part, the development of mold manufacturing technology for mass production is accompanied by the development of new industrial field such as IT, NT and BT. The metal injection molding(MIM) process combines the well-known thermoplastic injection and powder metallurgy technologies to manufacture small parts for IT, NT, BT industrial. In this study, the bar type MIM mold with a 800um thickness is made for influence of feedstock material and injection parameter through an experiment.

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최소 이송 기구를 갖는 PC-NC 기반의 비구면 렌즈 연마 장치에 관한 연구 (A Study on PC-NC Based Aspherical Lens Polishing System with Minimum Translation Mechanism)

  • 양민양;이호철
    • 한국정밀공학회지
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    • 제18권7호
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    • pp.65-71
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    • 2001
  • The development process of the polishing system for the aspherical lens mold for opto-electronics industry is described. The system uses the method that polishing tool is scanned on the surface under PC-NC control for the aspherical lens mold. The two axes interpolation of the minimum translation mechanism is applied to give uniform working condition by motion analysis. An aspherical surface is divided into multiple sections and each dwell time is calculated from the polishing rate model based on the Preston equation. As result of form error compensation experiment, initial form error is decreased about 25% while an average value of surface roughness is also reduced successfully from 180nm to 19nm.

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스파이럴 형상 미세사출품의 성형 인자에 대한 실험적 연구 (An Experimental Study on Molding Factor for Spiral Type Micro Injection Product)

  • 정우철;허영무;신광호;윤길상;장성호;김무연
    • 소성∙가공
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    • 제15권1호
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    • pp.65-70
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    • 2006
  • In recent industry, with the miniaturization and high-precision of machine part, the development of mold manufacturing technology for mass production is accompanied by the development of new technology such as IT and BT In this study, the spiral type injection mold with a $200{\mu}m$ thickness is made to. investigating the influence of injection molding parameter and the flow length is measured through an experiment. Besides, Taguchi method is used in this experiment and the obtained data are analyzed using ANOVA method.

림성형 공정의 기포에 관한 연구 (A Study on Bubbles in The RIM Process)

  • 양화준;강대원;강영중;김성준;장태식;이일엽
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2001년도 춘계학술대회 논문집
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    • pp.303-306
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    • 2001
  • To shorten the delivery time for new products, a lot of prototype plastic parts manufacturing technologies have been developed including injection molding, vacuum casting, thermal forming and so on. Among them, RIM is becoming one of a important soft tooling methods to produce prototype and mass production parts within short time. Further more, as the rapid prototyping technology based tooling methods are playing an important role in prototype manufacturing industry, the utility of the RIM is increasing. But few analyses and mold design techniques have been developed so far due to its chemical and mechanical complexity during the packing and curing process. This research suggests mold gate design criteria to prevent bobbles from molded parts through simplified mathematical model and change of bubble sizes according to the geometry of the molded parts through experiments. Also this study shows the differences of bobble generation mechanism between RIM and injection molding.

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직교배열과 분산분석법을 이용한 사출금형 냉각시스템 파라미터의 시뮬레이션 최적설계 (A Simulation-based Optimization of Design Parameters for Cooling System of Injection Mold by using ANOVA with Orthogonal Array)

  • 박종천;신승민
    • 한국기계가공학회지
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    • 제11권5호
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    • pp.121-128
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    • 2012
  • The optimization of cooling system parameters for designing injection mold is very important to acquire the highest part quality. In this paper, the integration of computer simulations of injection molding and Analysis of Variance(ANOVA) with orthogonal array was used as a design tool to optimize the cooling system parameters aimed at minimizing the part warpage. The design optimizer was applied to find the optimum levels of cooling system parameters for a dustpan. This optimization resulted in more uniform temperature distribution over the part and significant reduction of a part warpage, showing the capability of present method as an effective design tool. The whole optimization process was performed systematically in a proper number of cooling simulations. The design optimizer can be utilized effectively in the industry practice for designing mold cooling system with less cost and time.