Articles written by Dr. Taylan Altan

Dr. Taylan Altan

Director

Center for Precision Forming

339 Baker Systems
1971 Neil Ave.
Columbus, OH 43210-1271
phone: 614-292-9267

www.cpforming.org
Contact via email

Results: 32

	Update: Hot-stamping boron-alloyed steels for automotive parts CPF has conducted experiments using finite element simulation of the hot stamping process. The process can help manufacturers predict such final part properties as thickness, temperature, and hardness distribution. Publish date: March 10, 2011
	Lubrication and galling in stamping of galvanized AHSS Forming of galvanized AHSS involves higher contact pressures at the tool-workpiece interface compared to forming mild steel. Under these severe interface conditions, improper selection of lubricants, tool materials and tool coatings may result in high scrap rates and galling in stamping... Publish date: April 15, 2008
	Dissecting defects - Part III Editor's Note: This article is part of a three-part series. Part I categorizes defect types and discusses the factors that affect formed part quality; Part II covers various destructive and nondestructive tests for evaluating incoming material; and Part III is an introduction to process... Publish date: December 11, 2007
	Dissecting defects Dissecting Defects is a three-part series. Publish date: December 11, 2007
	Dissecting defects - Part II Editor's Note: This article is part of a three-part series. Part I categorizes defect types and discusses the factors that affect formed part quality; Part II covers various destructive and nondestructive tests for evaluating incoming material; and Part III is an introduction to process... Publish date: November 6, 2007
	Dissecting defects - Part I Editor's Note: This article is part of a three-part series. Part I categorizes defect types and discusses the factors that affect formed part quality; Part II covers various destructive and nondestructive tests for evaluating incoming material; and Part III is an introduction to process... Publish date: October 9, 2007
	Blanking developments - Part III During high-speed blanking, press stroking rate and punch speeds, are higher than in conventional blanking. As a result, the shear zone has a higher strain rate, which affects a workpiece's sheared surface temperature and the tool surface. Publish date: September 11, 2007
	Blanking developments Fineblanking allows the production of sheet metal components with smooth edges in a single press stroke. This column discusses basic terminology and the principles of this process. Publish date: September 11, 2007
	Blanking developments - Part II Fineblanking in various forms is increasingly becoming accepted by the automotive industry for producing sheet metal components with smooth edges that don't require additional finishing operations. Publish date: August 8, 2007
	Blanking developments - Part I Fineblanking allows the production of sheet metal components with smooth edges in a single press stroke. This column discusses basic terminology and the principles of this process. Publish date: July 10, 2007
	Stamping research gains support Global competition continues to force the metal forming industry to reduce costs, improve technology, and increase productivity. With these trends in mind, the Ohio State University (OSU) and Virginia Commonwealth University (VCU) established in June 2006 the Center for Precision Forming to focus... Publish date: June 12, 2007
	Servo press forming applications Part III This column discusses several applications of servomotor-driven mechanical presses for forming at room temperature and at elevated temperatures. Publish date: May 8, 2007
	Servo press forming applications A servomotor gives a press slide motion flexibility in terms of accurate speed, motion, and position control. This flexibility produces infinite slide motion variations that may improve part quality and operations such as painting and assembly during one press stroke. Publish date: May 8, 2007
	Servo press forming applications Part II Servo presses are classified into two main types based on their drive systems: direct drives with high-torque, low-speed servomotors, or low-torque, high- speed servomotors. Publish date: April 10, 2007
	Servo press forming applications Part I A servomotor gives a press slide motion flexibility in terms of accurate speed, motion, and position control. This flexibility produces infinite slide motion variations that may improve part quality and operations such as painting and assembly during one press stroke. Publish date: March 13, 2007
	Hot-stamping boron-alloyed steels for automotive parts - Part III To accurately model the hot-stamping process, FE simulation needs to account for the mechanical, thermal, and microstructural changes in the workpiece. Publish date: February 13, 2007
	Hot-stamping boron-alloyed steels for automotive parts - Part I Hot-stamped parts are being used increasingly in cars in Europe and North America. Ultrahigh-strength steels, like boron alloys, which meet automotive safety and crash requirements, are difficut to form with cold stamping, so hot stamping with die quenching has been applied. Publish date: February 13, 2007
	Hot-stamping boron-alloyed steels for automotive parts - Part II Compared with cold-formed parts, hot-stamped parts provide better formability at high temperatures and exhibit no springback on the final part. Publish date: January 18, 2007
	Multipoint-control die cushion systems for stamping complex parts In deep drawing of complex, asymmetrical parts such as stainless steel kitchen sinks, blank holder force (BHF) needs to be controlled locally to regulate the flow of the sheet metal. An MPC blank holder system allows this control by placing individually programmable cushion pins around the blank... Publish date: November 7, 2006
	Warm forming magnesium, aluminum tubes Publish date: October 3, 2006
	Evaluating dry film lubricants for automotive applications Part III In recent studies, dry-film lubricants have been shown to give better lubrication conditions when compared to oil-based liquid lubricants. This factor, as well as savings in the amount of lubricant used, has helped increase the use of dry-film lubricants in the automotive industry for forming of... Publish date: November 8, 2005
	Air-assisted forming of aluminum alloy for automotive components Reducing weight while maintaining or improving functional requirements is one of the major goals of automotive design and manufacturing, as it decreases fuel consumption and improves structural design. As a result of these considerations, the use of aluminum alloys in car manufacturing continues... Publish date: August 9, 2005
	Hydroforming tapered engineered tubes Hydroforming often results in localized thinning. Using engineered tubesÂ--tubes that have a thicker wall where the tube is most prone to thinning--Âcan result in a stronger finished component. Publish date: June 8, 2004
	Using finite element analysis to roll-form tubes Roll forming is a common method for producing steel tubes. It is a continuous process in which a strip is guided through several sets of rolls that form the strip into the desired shape. After the final shape is achieved, tube edges are welded together to form a closed section. After the welding... Publish date: October 9, 2003
	Predicting springback in air bending, straight flanging All businesses tied to the metal forming industry are scrambling to find areas in which they can lower costs without sacrificing quality. Adding to this burden are a tight cash flow and a lack of financial resources to invest in process improvement equipment. Therefore, the savings must come from... Publish date: October 9, 2003
	Using binder force control, force modulation, to improve part quality, stamping efficiency Publish date: August 28, 2003
	Dieless NC forming Dieless NC forming or incremental sheet forming is a numerically controlled incremental process that can produce complex shapes from various materials. The process is based on localized plastic deformation in the sheet metal blank. It was developed as an alternative manufacturing method to... Publish date: June 12, 2003
	Sheet hydroforming in automotive applications Sheet hydroforming can be used in the automotive industry for forming alloys with low formability and prototype applications, among other handy applications. Publish date: April 15, 2002
	Design rules for forming aluminum stampings—Part 2 Publish date: February 2, 2002
	Design rules for forming aluminum stampings—Part 1 This brief overview discusses rules for aluminum stamping involving: die clearance, die radius, punch radius, minimum bend radii, round cups, rectangular box parts, and overhang limit. Publish date: February 2, 2002
	The importance of the n value in sheet forming Strain hardening is represented by the exponent n in the flow stress equation, which approximates the relation between true stress and true strain during plastic deformation of a metal. The constant n plays a crucial role in sheet metal forming, and this brief article describes its effects. Publish date: October 11, 2001
	Successful tube hydroforming: Watching parameters, accurately simulating the process yield good results A typical tube hydroforming system is shown in Figure 1. Within this system, a host of factors must be taken into account, from starting tube geometry and material properties to the quality of the final part (such as thickness distribution and dimensional accuracy). Publish date: June 15, 2001