Research Papers

Using Servo-Drive Presses to Determine the Effect of Blank Holder Pressure on Temperature Change in Warm Forming of Sheet

[+] Author and Article Information
Serhat Kaya

Department of Automotive Engineering, Atilim University, Ankara, 06836, Turkey; Engineering Research Center for Net Shape Manufacturing (ERC/NSM),  The Ohio State University, Columbus, OH 43210

J. Manuf. Sci. Eng 133(6), 061024 (Dec 27, 2011) (6 pages) doi:10.1115/1.4005457 History: Received October 26, 2010; Revised November 11, 2011; Published December 27, 2011; Online December 27, 2011

Heat transfer coefficient (HTC) is one of the most important and difficult-to-obtain parameter in high temperature environment. Contact pressure and workpiece surface roughness are among important parameters that affect the heat transfer in elevated temperature forming of sheets. In this study, HTCs are investigated experimentally by using a servo-drive press. With the flexibility that the servo-drive press offers, effect of various blank holder pressures on temperature change is determined. Before and after surface roughness conditions of aluminum and magnesium (from two different manufacturers) alloy sheets are compared. Experimental setup was modeled using deform 2d, and measured temperature curves were compared with the finite element analysis (FEA) predictions and a window of heat transfer coefficients were determined for warm forming of sheets. Determined heat transfer coefficients were implemented in a nonisothermal deep drawing FE model in deform 2d and results were compared with experiments. Good agreement was obtained between FEA predictions and experiments.

Copyright © 2011 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 8

Ra values of Al 5052-H32

Grahic Jump Location
Figure 9

Ra values of Mg AZ31-O (supplier A) and Mg AZ31-O (supplier B)

Grahic Jump Location
Figure 11

Change in sheet diameter with respect to BHP (sheet diameter: 100 mm)

Grahic Jump Location
Figure 12

Comparison of punch load predictions using various heat transfer coefficients (kW/m2 C) with experiment

Grahic Jump Location
Figure 1

The flexibility of slide motion in servo-drive (or free motion) presses [4]

Grahic Jump Location
Figure 2

Schematic view of nonisothermal deep drawing process sequence

Grahic Jump Location
Figure 3

Servo-drive press motion curves for warm forming

Grahic Jump Location
Figure 4

Open warm forming tooling (bottom die set on the left, top die set on the right, punch diameter: 40 mm, punch radius: 4 mm, die radius: 6 mm)

Grahic Jump Location
Figure 5

Top view of the fixture used to record temperature

Grahic Jump Location
Figure 6

Schematic view of the experimental setup and FE model

Grahic Jump Location
Figure 7

Measured and calculated temperature–time curves

Grahic Jump Location
Figure 10

BHP—Dome height at T = 300 °C

Grahic Jump Location
Figure 13

Predicted thickness distribution comparison with various heat transfer coefficients (kW/m2 C)



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In