Ali Fallahiarezoodar

Reducing springback, especially when forming advanced high-strength steels (AHSS), is a major challenge in sheet metal forming. The article “Reducing springback in hat-shape bending with variable BHF using a servo-hydraulic cushion,” published in the March/April 2018 issue of STAMPING...

Springback in AHSS and high-strength aluminum alloys can cause geometric and dimensional inaccuracies in the formed part. Researchers at the Center for Precision Forming at The Ohio State University, in cooperation with Hyson Metal Forming Solutions, Brecksville, Ohio, conducted a study of a relatively simple, 2-D hat-shape bending operation.

New materials require new manufacturing methods. Deep drawing of advanced high-strength steel (AHSS) and certain aluminum alloys (such as 6XXX) requires flexible forming operations. Therefore, the use of servo presses and servo hydraulic cushions continues to increase. Servo presses are used mainly...

In deep drawing, with or without draw beads, the sheet metal blank is restrained at the periphery of the die by the blank holder force (BHF). The relative motion between the punch and the die forces the metal to flow into the die cavity (see Figure 1). The quality of the formed part is determined...

Editor’s Note: This article is Part II of a two-part series. Part I, which appeared in the November/December 2016 issue, discussed the challenges of determining Young’s modulus, one of the most important parameters for springback prediction.

Editor’s Note: Part II of this article, which will appear in the January/February 2017 issue, will discuss the results and case studies of the newly introduced inverse analysis method for improving springback prediction. In the automotive industry, the use of advanced high-strength steels (AHSS)...

Formability is the ability of a sheet material to deform without failure or fracture. Information on formability helps process and tool design engineers predict failure during analysis of sheet metal forming processes for tool design. Formability information also is used to evaluate...

The researchers at The Ohio State University's Center for Precision forming perform research on controlling material flow in drawing operation using CNC hydraulic cushions to help improve drawability.

Editor’s Note: Part I of this article appeared in the January/February 2016 issue.

The Ohio State University's Center for Precision Forming provides an overview of design considerations and materials used in lightweighting in the automotive industry in the first part of a two-part series.

Finite element (FE)-based computer software commonly is used in the sheet metal forming and stamping industry for die design and for predicting metal flow and thinning in the formed part. It is a useful tool for predicting and preventing forming defects such as fracture and wrinkling. However,...

In the sheet metal forming industry, finite element (FE) simulation is an important tool for fabricators predicting metal flow, optimizing geometry, and selecting process variables before developing new dies. The accuracy of the simulation results depends highly on the accuracy of the input...

Advanced high-strength steel (AHSS) materials are multiphase steels that contain martensite, bainite, and/or retained austenite. The use of AHSS materials in the automotive industry is increasing every day, because these steels provide strength and satisfy functional requirements at reduced weight....