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research-article

Optimization of preform design in TR forging of heavy crankshafts

[+] Author and Article Information
Min Churl Song

Forging Engineering Team, Hyundai Steel, Co. LTD, Suncheon 58034, Korea
kalsong@hyundai-steel.com

C. J. Van Tyne

Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO80401, USA
cvantyne@mines.edu

Jin Rae Cho

Department of Naval Architecture and Ocean Engineering, Hongik University, Sejong 339-701, Korea
jrcho@hongik.ac.kr

Young Hoon Moon

School of Mechanical Engineering, Pusan National University, 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, Korea
yhmoon@pusan.ac.kr

1Corresponding author.

ASME doi:10.1115/1.4037039 History: Received January 14, 2017; Revised June 03, 2017

Abstract

Tadeusz Rut (TR) forging is a widely used forging method to create heavy, solid crankshafts for marine or power-generating engines. The preform of a TR forging is forged into a crank throw by simultaneously applying both a vertical and a horizontal deformation. It is necessary to optimize the preform design, since a conventional analytical design for the preform gives various choices for the geometric variables. The purpose of the current study is to optimize the preform design in TR forging for heavy crankshafts in order to improve the dimensional accuracy of a forged shape using a limited material volume. An FE model for TR forging was developed and validated by comparing with experimental results. Parametric FE analyses were used to evaluate the effects of the geometric variables of the preform on the final dimensions of the forged product. The geometric variables of the preform were optimized by a response surface method to obtain the results of parametric FE analyses. The volume allocation between the pin and the web of the preform is the dominant factor that affects the desirability of the final forged shape. A multi-objective optimization is employed to consider the mutually exclusive changes of local machining allowances of the final forged product. Optimization using a response surface method is a useful tool to reach the large and uniform machining allowances that are required for the preform necessary for a TR forging.

Copyright (c) 2017 by ASME
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