Journal ArticleDOI
Design and finite element analysis of innovative tooling elements (stress pins) to prolong-die life and improve dimensional tolerances in precision forming processes
Muammer Koç,Mehmet A Arslan +1 more
TLDR
In this article, the authors proposed the use of stress pins as an innovative pre-stressing element, and presented the results of a design methodology investigation through combined finite element analysis (FEA) and design of experiment (DOE) studies for large and non-axisymmetric precision forming tooling.About:
This article is published in Journal of Materials Processing Technology.The article was published on 2003-12-10. It has received 20 citations till now. The article focuses on the topics: Hydroforming.read more
Citations
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Journal ArticleDOI
Numerical simulation of the forging process
Peter Hartley,I. Pillinger +1 more
TL;DR: A short overview of recent research in the numerical simulation of forging, with an emphasis on applications rather than the mathematical formulations which are well documented elsewhere, can be found in this article, where the authors address a number of specific topics, including process modelling, tool and die design, interface phenomena, material Phenomena and Computational Aspects.
Journal ArticleDOI
Effects of hydrogen addition on the high temperature deformation behavior of TC21 titanium alloy
TL;DR: In this article, the true stress-strain curves of TC21 titanium alloy charged with up to 0.7% hydrogen were obtained by the isothermal hot compression tests which were carried out on an Instron 5500 machine at 1023 to 1223 K and 0.1 s −1.
Journal ArticleDOI
Forming-tool design innovation and intelligent tool-structure/system concepts
TL;DR: In this article, a review on tool-designs reported recently, innovative tool-structures/systems are classified, strategies and approaches for tool design innovation are discussed, which is followed by introducing a new forming-tool concept.
Journal ArticleDOI
Cold Forging Die Design: Recent Advanced and Future Trends
Journal ArticleDOI
An integrated computer-aided decision support system for die stresses and dimensional accuracy of precision forging dies
TL;DR: In this paper, both radial and tangential stresses are encountered in the determination of die stresses since cylindrical workpieces were used, and differences between the forging product and the die insert such as elastic die expansion and product contraction are presented.
References
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Book
Failure of materials in mechanical design
Jack A. Collins,C. O. Smith +1 more
Abstract: Failure of metals still exists in our midst. This problem has been around for many a year and yet no full explanation exists. We have made great strides in understanding its many component parts but the path is still strewn with a number of obstacles. Fatigue consists of a number of different facets which require a combined effort of analysis and experimentation. This unique book covers a number of different members of the fatigue family and goes into detail on a number of them. The book consists of 17 chapters, each chock full of information. The initial chapter considers the role of failure prevention in mechanical design and provides some of the prime design objectives. Chapter 2 discusses the various modes of mechanical failure. Chapter 3 is the heart of the book and treats the strength and deformation of engineering materials. This includes elastic and plastic response, fracture and a good section on dislocation theory. The author touches upon elastic fracture and elasto-plastic fracture mechanics. No mention is made of J integral which is an important aspect of plastic fracture mechanics. Chapter 4 treats state of stress and various parts making up this important concept. Chapter 5 focusses upon relationships between stress and strain. The author illustrates the relationships between elastic and plastic stress-strain. The author then spends time in developing the combined stress theories of failure. This includes the maximum normal stress theory, Tresca-Guest theory, Beltrami theory, VonMises Hencky (distortion energy) theory and Mohr's failure theory. This is a very well "put-together" chapter, concise but informative. Chapter 7, the most lengthiest, treats high cycle fatigue. Beginning with the nature of fatigue and fatigue loading, it progresses to S/N relationships and the various factors which affect the S/N curves. This includes geometrical considerations, size effects, residual stress effects with brief mention of corrosion and fretting. We next delve into nonzero mean stress and multiaxial fatigue stresses. The chapter concludes with the uses of the various components of multiaxial fatigue stresses as applied to fatigue stresses. This is an excellent chapter and should be read by all concerned parties.
Journal ArticleDOI
An overall review of the tube hydroforming (THF) technology
Muammer Koç,Taylan Altan +1 more
TL;DR: In this article, the authors summarized a technological review of the hydroforming process from early years to very recent dates on various topics such as material, tribology, equipment, tooling, etc., so that other researcher at different parts of the world can use it for further investigations in this area.
Book
Metal forming handbook
TL;DR: The bending height of a metal plate is at least twice the thickness of the metal plate plus the bending radius as discussed by the authors, which is defined as the radius of the bending surface of the plate.
Journal ArticleDOI
Die design for flashless forging of complex parts
Victor Vazquez,Taylan Altan +1 more
TL;DR: In this paper, the volume distribution of the preform must be accurately controlled to avoid overloading the dies and to fill the cavity, and a simple preform should be simple enough to be mass-produced.
Journal ArticleDOI
Preform die shape design in metal forming using an optimization method
TL;DR: In this article, an optimization algorithm for preform die shape design in metal-forming processes is developed, where the preform shapes are represented by cubic B-spline curves.
Related Papers (5)
A finite element analysis of cold-forging dies using two- and three-dimensional models
Conor McCormack,John Monaghan +1 more