• 제목/요약/키워드: Expandable polystyrene

검색결과 35건 처리시간 0.027초

발포 폴리스티렌 폼을 이용한 가변 적층 쾌속 조형 공정 설계 및 개발 (Development and Design of Variable Lamination Manufacturing (VLM) Process by Using Expandable Polystyrene Foam)

  • 안동규;이상호;양동열;신보성;박승교;이용일
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2000년도 추계학술대회 논문집
    • /
    • pp.759-762
    • /
    • 2000
  • Rapid Prototyping (RP) techniques have their unique characteristics according to the working principles: stair-stepped surface of parts due to layer-by-layer stacking, low build speed caused by line-by-line solidification to build one layer, and additional post processing to improve surface roughness, so it is required very high cost to introduce and to maintain RP apparatus. The objective of this study is to develop and design a new RP process, Variable Lamination Manufacturing using expandable polystyrene foam sheet as part material (VLM-S), which can make up for the disadvantage of existing techniques, and to develop an apparatus to implement the process. In order to examine the possibility of practical utilization of the proposed VLM-S process for prototyping of a general three-dimensional shape, an auto-shift lever knob and a pyramid shape were fabricated.

  • PDF

가변 적층 쾌속 조형 공정 개발을 위한 단위형상조각 자동 생성 소프트웨어 개발 및 적용 예 (Software Development for Automatic Generation of Unit Shape Part for Variable Lamination Manufacturing Process)

  • 이상호;김태화;안동규;양동열;채희창;문영복;신보성
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2000년도 추계학술대회 논문집
    • /
    • pp.763-766
    • /
    • 2000
  • Rapid Prototyping(RP) techniques have their unique characteristics according to the working principles: stair-stepped surface of parts due to layer-by-layer stackin, low build speed caused by line-by-line solidification to build one layer, and additional post processing to improve surface roughness, so it is required very high cost to introduce and to maintain RP apparatus. The objective of this study is to develop software for automatic generation of unit shape part (USP) for a new RP process, Variable Lamination Manufacturing using linear hotwire cutting technique and expandable polystyrene foam sheet as part material (VLM-S). In order to examine the applicability of the developed software to VLM-S, USP's of general three-dimensional shapes, such as an auto-shift lever knob and a pyramid shape were generated.

  • PDF

바닥충격음 완충재의 재하시간에 따른 동적 특성 연구 (A Study on the Dynamic Properties by Loading Time of Floor Impact Noise Insulation Materials)

  • 김흥식;진필화;주시웅;정성원
    • 한국소음진동공학회:학술대회논문집
    • /
    • 한국소음진동공학회 2005년도 추계학술대회논문집
    • /
    • pp.942-945
    • /
    • 2005
  • The purpose of this study is to suggest a fundamental data for change of dynamic properties according to the loading time of resilient materials. 18 kinds of resilient materials included 4 representative types were measured at the load time of 24hours and 2hours by the method of Korea standard (KS F 2868) measuring the dynamic stiffness and the loss factor of materials under floating floors. As a result, the dynamic stiffness was increased rapidly in case of expandable polystyrene and rubber materials according to the load time, especially before 2 hours. The loss factor was represented that rubber materials with high elasticity are high, and expandable polystyrene, polyester, poly ethylene materials with low elasticity are low.

  • PDF

가변 적층 쾌속 조형 공저 개발을 위한 발포 폴리스티렌폼의 선형 열선 절단시스템 절단 특성 및 접착강도 특성에 대한 연구 (Investigation of Cutting Characteristics of Linear Hotwire Cutting System and Bonding Characteristics of Expandable Polystyrene Foam for Variable Lamination Manufacturing(VLM) Process)

  • 안동규;이상호;양동열;신보성;이용일
    • 한국정밀공학회지
    • /
    • 제17권12호
    • /
    • pp.185-194
    • /
    • 2000
  • Rapid Prototyping(RP) techniques have their unique characteristics according to the working principles: stair-stepped surface of parts due to layer-by-layer stacking, low build speed caused by line-by-line solidification to build one layer, and additional post processing to improve surface roughness, so it is required very high cost to introduce and to maintain of RP apparatus. The objective of this study is to develop a new RP process, Variable Lamination Manufacturing using linear hotwire cutting technique and expandable polystyrene foam sheet as part material(VLM-S), and to investigate characteristics of part material, cutting characteristics by using linear hotwire cutting system and bonding. Experiments were carried out to investigate mechanical properties of part material such as anisotropy and directional tensile strength. In order to obtain optimal dimensional accuracy, surface roughness, and reduced cutting time, addition experiments were performed to find the relationship between cutting speed and cutting offset of hotwire, and heat generation of hotwire per unit length. So, adhesion strength tests according to ASTM test procedure showed that delamination did not occur at bonded area. Based on the data, a clover-shape was fabricated using unit shape part(USP) it is generated hotwire cutting. The results of present study have been reflected on the enhancement of the VLM-S process and apparatus.

  • PDF

발포 폴리스티렌 폼을 이용한 가변 적층 쾌속 조형 공정 밀 장치 개발 (Development of Variable Lamination Manufacturing(VLM) Process and Apparatus by Using Expandable Polystyrene Foam)

  • 안동규;이상호;양동열;신보성;박승교;이용일
    • 한국정밀공학회지
    • /
    • 제18권8호
    • /
    • pp.54-63
    • /
    • 2001
  • Rapid Prototyping(RP) techniques have their unique characteristics according to the working principles: stair-stepped surface of a part due to layer-by-layer stacking, low build speed caused by point-by-point or line-by-line solidification to build one layer, and additional posts processing to improve surface roughness, so high cost is required to introduce and to maintain the RP apparatus. The objective of this study is to develop a new RP process, Variable Lamination Manufacturing by using expandable polystyrene foam sheet as part material(VLM-S), and to design an apparatus for implementation of the process. So, the process parameters and design criterions of the apparatus were defined and the techniques were proposed to satisfy the design criterion. Based on the results, a knob-shape, pyramid shape. and a solid block were fabricated on the apparatus in which unit shape part(USP) was generated for building each layer.

  • PDF

가변 적층 쾌속 조형 공정 개발을 위한 단위형상조각 자동 생성 소프트웨어 개발 및 적용 예 (Software Development for Automatic Generation of Unit Shape Part for Variable Lamination Manufacturing Process)

  • 이상호;김태화;안동규;양동열;채희창
    • 한국정밀공학회지
    • /
    • 제18권8호
    • /
    • pp.64-70
    • /
    • 2001
  • In all the Rapid Prototyping (RP) techniques, the computer-aided design (CAD) model of a three-dimensional part is sliced into horizontal layers of uniform, but not necessarily constant, thickness in the building direction. Each cross- sectional layer is successively deposited and, at the same time, bonded onto the previous layer. The stacked layers form a physical part of the model. The objective of this study is to develop a software for automatic generation of unit shape part(USP) for a new RP process, Variable Lamination Manufacturing using the linear hotwire cutting technique and expandable polystyrene foam sheet as part material(VLM-S). In order to examine the applicability of the developed software to VLM-S, USPs of general three-dimensional shapes, such as an auto-shift lever knob and a pyramid shape were generated.

  • PDF

발포 폴리스티렌 폼을 이용한 가변적층 쾌속조형공정의 형상 정밀도 개선을 위한 열전달 특성 및 잔여 재료폭 영향에 관한 연구 (Investigation of Thermal Characteristics and Skeleton Size Effects to improve Dimensional Accuracy of Variable Lamination Manufacturing by using EPS Foam)

  • 안동규;이상호;양동열
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2001년도 춘계학술대회 논문집
    • /
    • pp.910-913
    • /
    • 2001
  • Rapid Prototyping(RP) techniques have unique characteristics according to their working principle: the stair-stepped surface of a part due to layer-by-layer stacking, low building speed, and additional post-processing to improve surface roughness. A new RP process, Variable Lamination Manufacturing by using expandable polystyrene foam(VLM-S), has been developed to overcome the unfavorable characteristics. The objective of this study is to investigate the thermal characteristics and skeleton size effects as the hotwire cuts EPS foam sheet in order to improve dimensional accuracy of the parts, which is produced by VLM-S. Empirical and analytical approaches are performed to find the relationship between cutting speed and heat input, and the relationship between maximum available cutting speed and heat input. In addition, empirical approaches are carried out to find the relationship between cutting error and skeleton size, and cutting deviation and skeleton size. Based on these results, the optimal hotwire cutting condition and available minimum skeleton size are derived. The outcomes of this study are reflecting in the enhancement of VLM-S input data generation S/W.

  • PDF

Expandable Polystyrene Box 의 오이의 신선도 유지효과 (Freshness Extension of Cucumber packed with Expandable Polystyrene Box)

  • 박형우;김상희;박종대
    • 한국포장학회지
    • /
    • 제4권2호
    • /
    • pp.18-23
    • /
    • 1998
  • 개발한 EPS 포장상자가 오이의 신선도 유지효과 기능이 있는지의 여부를 분석코자 오이를 골판지상자와 0.02와 0.04mm 두께의 LDPE필름으로 포장 $20^{\circ}C$에 저장하면서 신선도 유지효과를 비교하였다. 저장 7일후 중량감소는 대조구는 4.9%, EPS 상자는 0.8%의 중량감소가 나타났고, 경도는 대조구 보다 필름구와 EPS 포장구에서 높았으며 비타민C도 EPS 포장구가 대조구 보다 15% 높게 유지되고 있었고 클로로필 함량은 EPS 포장구가 대조구 보다 21% 높게 유지되고 있었다. 부패는 포장구간에 나타나지 않았으며 대조구에서 표면이 노랗게 변하였으나 필름구와 EPS에서는 변하지 않았다 EPS 포장상자는 신선도 유지효과가 기존의 골판지상자 보다 더 우수하였다.

  • PDF

Expandable Polystyrene Box의 '신고' 배의 신선도 유지효과 (Freshness Extension of 'Shingo' Pear Packed with Expandable Polystyrene Form Box)

  • 박형우;박종대;김동만;이명훈
    • 한국포장학회지
    • /
    • 제4권2호
    • /
    • pp.12-17
    • /
    • 1998
  • 개발한 EPS 포장상자가 농산물의 신선도 유지효과 기능이 있는지의 여부를 분석코자 배를 포장하여 $20^{\circ}C$에 저장하면서 골판지상자와 0.02와 0.04mm 두께의 LDPE필름으로 포장한 것들과 신선도 유지효과를 비교하였다. 저장 50일 후 중량 감소는 대조구는 4.4%, EPS 상자는 0.7%의 중량감소가 나타났고, 비타민C도 2.12와 2.63 mg%로 EPS 포장구가 20% 높게 유지되고 있었다. 당도와 산도는 포장구간에 큰 차이가 있었으며 부패는 대조구는 상자당 1-2개과가 발생했으나 EPS 포장구는 발생하지 않아 개발한 EPS 포장구를 신선도 유지를 위한 유통용 상자로 활용가능성이 확인되었다.

  • PDF

폐스티로폼의 감용방식에 관한 연구 (A Study on the Various Volume Reducing Methods for Wasted EPS Foam)

  • 임중연;최호준;황병복
    • 한국자원리싸이클링학회:학술대회논문집
    • /
    • 한국자원리싸이클링학회 2003년도 추계정기총회 및 국제심포지엄
    • /
    • pp.165-169
    • /
    • 2003
  • Current volume reduction methods for wasted expandable polystyrene (EPS) foam are summarized and compared each other. Wasted EPS foam has not been recycled effectively because of its large volume to weight ratio. This has prevented from its proper recycling because of high cost of transportation to recycling plant. Successful recycling of wasted EPS foam results directly from successful, i.e. economically and environmentally, volume reduction of wasted EPS foam. This paper deals with various methods for volume reduction methods of wasted EPS foam. Five typical methods of volume reduction are introduced and they are compared each other in terms of expected PS properties after volume reduction, cost effectiveness of each process, possible effects on environment caused by the volume reduction process, and possible recycled products. The methods include thermal, solvent, far infrared and mechanical compaction. Comparison in this paper is made mostly in qualitative manner. The focus in this study is concentrated on summarizing and comparing existing methods of volume reduction for wasted EPS foam.

  • PDF