서지주요정보
VLM-ST 제품의 국부 형상 정밀도 향상을 위한 후가공 공정 개발에 관한 연구 = Development of a post-processing system to improve geometrical precision of the detailed shape in VLM-ST parts
서명 / 저자 VLM-ST 제품의 국부 형상 정밀도 향상을 위한 후가공 공정 개발에 관한 연구 = Development of a post-processing system to improve geometrical precision of the detailed shape in VLM-ST parts / 김효찬.
저자명 김효찬 ; Kim, Hyo-Chan
발행사항 [대전 : 한국과학기술원, 2003].
Online Access 제한공개(로그인 후 원문보기 가능)원문

소장정보

등록번호

8013873

소장위치/청구기호

학술문화관(문화관) 보존서고

MME 03031

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Rapid prototyping (RP) technology has contributed greatly to the reduction of the lead-time and costs of the product development. In most RP processes, however, the inherent stair-stepped surfaces and shrinkage-induced warping of the parts require post processing such as surface finishing. To minimize such defects, VLM-ST, a newly developed RP process, employs a 3.9-mm thick expandable polystyrene (EPS) foam sheet and a hot wire to contour it to have slant linear-interpolated sides. The use of relatively thick sheets for layers, however, limits the process capability of constructing fine details, especially smaller than the layer thickness. This study is focused on the development of a post processing method for fine details of VLM-ST parts and on the investigation of its thermal characteristics through numerical analysis and experiments. The developed post processing apparatus consists of the post-processing tool, an XYZ CNC table, a power supply and the control system. The post-processing tool was designed to meet all the requirements for the desirable post processing. It adopted a hot wire as a means of melting the EPS foam sheet. Various basic experiments on the post processing were carried out to obtain the optimal process conditions. To predict the heat-affected zone and temperature distribution of VLM-ST parts in post-processing, the heat flux from the tool to the surface was calculated for the finite element analysis by modeling the tool as a heat source of radiation. The dominant process parameters such as the radiated heat input, the tool speed, and the gap between the tool tip and the foam sheet (tool height) were considered in the analysis. The results showed a good agreement with the experiments. The effectiveness of the developed post-processing method for engraving fine details on the VLM-ST parts has been thus demonstrated. The experiments on engraving several sets of letters, such as CANESM, 인간, and 한국과학기술원, on the EPS foam sheet were carried out. In addition, a flowery shape was engraved on a three-dimensionally curved surface of a pottery-shape VLM-ST part.

서지기타정보

서지기타정보
청구기호 {MME 03031
형태사항 xi, 99 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Hyo-Chan Kim
지도교수의 한글표기 : 양동열
지도교수의 영문표기 : Dong-Yol Yang
학위논문 학위논문(석사) - 한국과학기술원 : 기계공학전공,
서지주기 참고문헌 : p. 92-96
주제 가변 적층 쾌속 조형 공정
후가공 공정
국부 형상 정밀도
복사열원
비정상 열전달 해석
Variable Lamination Manufacturing process
Post-processing
Precision of detailed Shape
Radiation Heat Source
Transient thermal analysis
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