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ASM Handbook

Metalworking: Bulk Forming

Edited by
S.L. Semiatin
S.L. Semiatin
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ASM International
Volume
14A
ISBN electronic:
978-1-62708-185-6
Publication date:
2005
Book Chapter

Cold Heading

By
Toby Padfield
Toby Padfield
Revising author
ZF Sachs Automotive
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Murali Bhupatiraju
Murali Bhupatiraju
Revising author
Metaldyne Corporation
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Published:
2005
Page range:
383 - 404
Publication history
March 27, 2006

Abstract

Cold heading is typically a high-speed process where a blank is progressively moved through a multi-station machine. This article discusses various cold heading process parameters, such as upset length ratio, upset diameter ratio, upset strain, and process sequence design. It describes the various components of a cold-heading machine and the tools used in the cold heading process. These include headers, transfer headers, bolt makers, nut formers, and parts formers. The article explains the operations required for preparing stock for cold heading, including heat treating, drawing to size, machining, descaling, cutting to length, and lubricating. It lists the advantages of the cold heading over machining. Materials selection criteria for dies and punches in cold heading are also described. The article provides examples that demonstrate tolerance capabilities and show dimensional variations obtained in production runs of specific cold-headed products. It concludes with a discussion on the applications of warm heading.

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Toby Padfield, Murali Bhupatiraju, 2005. "Cold Heading", Metalworking: Bulk Forming, S.L. Semiatin

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