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Titolo:
An upper bound analysis of a process-induced side-surface defect in forgings Part 2: Characteristics and criteria curves
Autore:
Moon, YH; Van Tyne, CJ; Gordon, WA;
Indirizzi:
Pusan Natl Univ, Engn Res Ctr Net Shape & Die Mfg, Pusan 609735, South Korea Pusan Natl Univ Pusan South Korea 609735 Mfg, Pusan 609735, South Korea Colorado Sch Mines, Dept Met & Mat Engn, Golden, CO 80401 USA Colorado SchMines Golden CO USA 80401 t & Mat Engn, Golden, CO 80401 USA Torrington Co, Ctr Adv Technol, Torrington, CT USA Torrington Co Torrington CT USA Co, Ctr Adv Technol, Torrington, CT USA
Titolo Testata:
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
fascicolo: 1-3, volume: 99, anno: 2000,
pagine: 179 - 184
SICI:
0924-0136(20000301)99:1-3<179:AUBAOA>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Keywords:
upper bound analysis; side-surface defect; double action forging process; criteria curve; constant friction factor;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
5
Recensione:
Indirizzi per estratti:
Indirizzo: Moon, YH Pusan Natl Univ, Engn Res Ctr Net Shape & Die Mfg, San 30 Jangjeondong, Pusan 609735, South Korea Pusan Natl Univ San 30 Jangjeondong PusanSouth Korea 609735 rea
Citazione:
Y.H. Moon et al., "An upper bound analysis of a process-induced side-surface defect in forgings Part 2: Characteristics and criteria curves", J MATER PR, 99(1-3), 2000, pp. 179-184

Abstract

An upper bound analysis for an axisymmetric forging with a double ram action has been developed. The results of the analysis provide manufacturing conditions that can be used without the development of unacceptable side-surface cracks. There are processing conditions that cause the defective flow pattern to be most favorable. The transition from an energetically-favorablesound flow to an energetically-favorable defect flow is used to determine the criteria curves for the prevention of this side-surface defect. It is found that the formation of the side-surface cracks is promoted by smaller diameter rams, smaller workpiece thicknesses and lower friction. The first paper in this two-part series presents the velocity fields and the individual power terms that were derived based upon these velocity fields, whilst this second paper shows the characteristics of the upper bound solution for the double action forging process. This second paper also presents the criteria for the prevention of the side-surface defects that were determined based upon the upper bound solution. (C) 2000 Elsevier Science S.A. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 09:12:40