서지주요정보
후방 압출을 이용한 마찰 조건 측정 = Measurement of friction condition using backward extrusion
서명 / 저자 후방 압출을 이용한 마찰 조건 측정 = Measurement of friction condition using backward extrusion / 강성훈.
저자명 강성훈 ; Kang, Seong-Hoon
발행사항 [대전 : 한국과학기술원, 2001].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8011653

소장위치/청구기호

학술문화관(문화관) 보존서고

MME 01008

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

리뷰정보

초록정보

With the recent increase in the demand for net shape forming, numerical simulations are being widely used to increase the efficiency and effectiveness of the design of bulk metal forming processes. Consideration of tribological problems at the contact interface between the tool and material is very important in such numerical simulations. Lubrication and friction play crucial roles in metal forming by influencing metal flow, forging load and die wear. In this study, a new friction test based on backward extrusion is proposed in order to evaluate the shear friction factor in metal forming operations. In this measuring method, the workpiece material is primarily positioned at a predetermined groove location within the forming die of the extrusion tool-set and is pressurized by a punch. This process forms a sharp tip at the backward extruded end of the extruded product. Thereafter, the perpendicular distance from the external side surface of the extruded product to the tip is measured and used to calculate the shear friction factor. Experiments were carried out using annealed aluminum alloy AL6061-O as the workpiece material with different kinds of lubricants. The relation between the tip distance and the shear friction factor was obtained through simulations using CAMPform, which is a thermal-rigid viscoplastic FEM program, in the backward extrusion process for a reduction ratio of 64%. The shear friction factor, which has a range of 0.0~1.0, is calculated using the this linear relationship between the shear friction factor and the tip distance.

서지기타정보

서지기타정보
청구기호 {MME 01008
형태사항 iii, 82 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Seong-Hoon Kang
지도교수의 한글표기 : 임용택
지도교수의 영문표기 : Yong-Taek Im
학위논문 학위논문(석사) - 한국과학기술원 : 기계공학전공,
서지주기 참고문헌 : p. 31-35
주제 마찰상수
후방 압출
유한요소법
부피단조
friction factor
backward extrusion
finite-element method
bulk metal forming
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