NDLI: Novel Extrusion Punch Design for Improved Lubrication and Punch Ejection

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Lowrie, James Ngaile, Gracious
Copyright Year	2015
Abstract	The extreme surface expansion and pressures observed during the backward extrusion process can have adverse effects on the surface of the workpiece and the life of the punches used in the process. After the forming process is complete, the ejection of the punch can further damage the part surface and reduce tool life because the pressures on the land of the punch remain quite high. The research presented in this investigation aims to reduce or eliminate the galling and surface damage for the backward extrusion process by creating a new class of punch which can create the opportunity for lubrication transport to the area underneath the punch and lessen the damaging conditions during punch ejection. The proposed tooling divides the traditional punch into two pieces, a hollow punch body and an insert with micro channels for lubrication transport. The tooling was developed and used in a series of tests to determine the benefits of the new punch. Preliminary data shows that the extrusion loads for proposed punch are similar to the conventional punch, but the surface finish is significantly enhanced using the modified punch design and the galling is minimized. Furthermore, there is a marked reduction in the ejection load required to remove the punch from the part after forming.
Sponsorship	Manufacturing Engineering Division
File Format	PDF
ISBN	9780791856826
DOI	10.1115/MSEC2015-9496
Volume Number	Volume 1: Processing
Conference Proceedings	ASME 2015 International Manufacturing Science and Engineering Conference
Language	English
Publisher Date	2015-06-08
Publisher Place	Charlotte, North Carolina, USA
Access Restriction	Subscribed
Subject Keyword	Design Finishes Extruding Lubrication Damage Galling Stress Tooling Microchannels
Content Type	Text
Resource Type	Article

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