Abstract
Central bursts, or chevrons, are the internal arrows shaped defects occasionally encountered in cold extrusions or drawn wire (Figure 1). In cold extrusion the defect is usually observed in the final, light step of a multistep extrusion. When central bursting occurs, the load-carrying capacity of the part is drastically reduced. The possibility of central burst occurrence has required manufacturers of critical parts, e.g., axle shafts and steering gear components, to install and maintain ultrasonic equipment for 100% inspection of the formed parts. Although inspection can prevent the use of components containing central bursts, the rejection of extruded items increases production costs because both material and time are consumed in the manufacture of the unacceptable parts. Thus, it is desirable to completely prevent the occurrence of central bursts.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
References
Jennison, H. C., “Certain Types of Defects in Copper Wire Caused by Improper Dies and Drawing Practice”, Trans AIME, 1930, p 121.
Tanaka, H., “On the Causes of Cuppy Defects in a Drawn Material” J. Japanese Inst. of Metals, V. 16, 1952.
Russell, J. V., “Steels for Cold Forming”, Metals Engineering Quarterly, Feb. 1962.
Johnson, W. and Kudo, H., The Mechanics of Metal Extrusion, Manchester University Press, 1962.
Pugh, H. Le. D. and Watkins, M. T., “Experimental Investigation of the Extrusion of Metals”, Production Engineering, V. 40, No. 4, London, April 1961, p 256.
Zimerman, Z., and Avitzur, B., “Analysis of the Effect of Strain Hardening on Central Bursting Defects in Drawing and Extrusion”, Journal of Eng. for Industry, Trans. ASME, Series B, Vol. 92, No. 1, Feb. 1970, p 135.
Avitzur, B., Metal Forming — Processes and Analysis, McGraw-Hill, New York, 1968, Chapter 8.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1971 Springer Science+Business Media New York
About this paper
Cite this paper
Zimerman, Z., Darlington, H., Kottcamp, E.H. (1971). Selection of Operating Parameters to Prevent Central Bursting Defects During Cold Extrusion. In: Hoffmanner, A.L. (eds) Metal Forming: Interrelation Between Theory and Practice. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1757-3_2
Download citation
DOI: https://doi.org/10.1007/978-1-4615-1757-3_2
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4613-5708-7
Online ISBN: 978-1-4615-1757-3
eBook Packages: Springer Book Archive