Development of a robust method to accomodate springback distortion in multistage sheet metal forming

Numerical simulation by finite element method has become a powerful tool in preventing the unwanted effects of sheet metals technological processing. One of the most important problems in sheet metal forming is the compensation of springback. When stamped sheet components are removed from the formin...

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Main Authors:	Omar, Badrul, Siswanto, Waluyo Adi, Anggono, Agus Dwi
Other Authors:	Mohd Nor, Mohd Jailani
Format:	Thesis
Published:	Ministry of Higher Education Malaysia 2011
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.uthm.edu.my/3856/

id	uthm-3856
recordtype	eprints
spelling	uthm-38562013-05-16T08:38:01Z Development of a robust method to accomodate springback distortion in multistage sheet metal forming Omar, Badrul Siswanto, Waluyo Adi Anggono, Agus Dwi TJ Mechanical engineering and machinery Numerical simulation by finite element method has become a powerful tool in preventing the unwanted effects of sheet metals technological processing. One of the most important problems in sheet metal forming is the compensation of springback. When stamped sheet components are removed from the forming tools, the residual internal stresses will relax, and a new equilibrium state will be reached. As a result, the final shape of the drawn part will deviate from the shape imposed by the forming tool. This phenomenon is known as springback. Springback phenomenon theoretically exists for anything kind of deep drawing or stamping process. In fact it is a well known and unwanted characteristic of every process that involves plastic deformations on elastic metals. To improve the accuracy of the formed parts, the die surfaces are required to be optimized so that after springback the geometry falls at the expected shape. Two methods of die compensation can be applied for this purpose; ~is~lacement~djustment (DA) and Karafillis and Boyce (K&B) methods. They are the so called spring-back compensation and spring-forward compensation. Both are based on an iterative procedure. The die compensation were studied by applied of both DA and K&B method. DA converges rapidly but its iterations may oscillate and K&B converges more slowly but iterations show steadily decreasing error. The combination of K&B 1 method and DA were applied with an improvement of the adjustment direction from y direction in original DA method to a normal vector of the surface to maintain the surface gap of lower and upper surface in a consistent way. The initial development of the hybrid algorithm is presented, a numerical test results on a simple model are also presented to support. Ministry of Higher Education Malaysia Mohd Nor, Mohd Jailani 2011 Thesis PeerReviewed Omar, Badrul and Siswanto, Waluyo Adi and Anggono, Agus Dwi (2011) Development of a robust method to accomodate springback distortion in multistage sheet metal forming. Other thesis, Universiti Tun Hussein Onn Malaysia. http://eprints.uthm.edu.my/3856/
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Tun Hussein Onn Malaysia
building	UTHM Institutional Repository
collection	Online Access
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Omar, Badrul Siswanto, Waluyo Adi Anggono, Agus Dwi Development of a robust method to accomodate springback distortion in multistage sheet metal forming
description	Numerical simulation by finite element method has become a powerful tool in preventing the unwanted effects of sheet metals technological processing. One of the most important problems in sheet metal forming is the compensation of springback. When stamped sheet components are removed from the forming tools, the residual internal stresses will relax, and a new equilibrium state will be reached. As a result, the final shape of the drawn part will deviate from the shape imposed by the forming tool. This phenomenon is known as springback. Springback phenomenon theoretically exists for anything kind of deep drawing or stamping process. In fact it is a well known and unwanted characteristic of every process that involves plastic deformations on elastic metals. To improve the accuracy of the formed parts, the die surfaces are required to be optimized so that after springback the geometry falls at the expected shape. Two methods of die compensation can be applied for this purpose; ~is~lacement~djustment (DA) and Karafillis and Boyce (K&B) methods. They are the so called spring-back compensation and spring-forward compensation. Both are based on an iterative procedure. The die compensation were studied by applied of both DA and K&B method. DA converges rapidly but its iterations may oscillate and K&B converges more slowly but iterations show steadily decreasing error. The combination of K&B 1 method and DA were applied with an improvement of the adjustment direction from y direction in original DA method to a normal vector of the surface to maintain the surface gap of lower and upper surface in a consistent way. The initial development of the hybrid algorithm is presented, a numerical test results on a simple model are also presented to support.
author2	Mohd Nor, Mohd Jailani
author_facet	Mohd Nor, Mohd Jailani Omar, Badrul Siswanto, Waluyo Adi Anggono, Agus Dwi
format	Thesis
author	Omar, Badrul Siswanto, Waluyo Adi Anggono, Agus Dwi
author_sort	Omar, Badrul
title	Development of a robust method to accomodate springback distortion in multistage sheet metal forming
title_short	Development of a robust method to accomodate springback distortion in multistage sheet metal forming
title_full	Development of a robust method to accomodate springback distortion in multistage sheet metal forming
title_fullStr	Development of a robust method to accomodate springback distortion in multistage sheet metal forming
title_full_unstemmed	Development of a robust method to accomodate springback distortion in multistage sheet metal forming
title_sort	development of a robust method to accomodate springback distortion in multistage sheet metal forming
publisher	Ministry of Higher Education Malaysia
publishDate	2011
url	http://eprints.uthm.edu.my/3856/
first_indexed	2018-09-05T11:08:55Z
last_indexed	2018-09-05T11:08:55Z
_version_	1610765550630207488

Development of a robust method to accomodate springback distortion in multistage sheet metal forming

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