Dummy Block Lubrication Best Practices
James E. Dyla, AMCOL Corporation, Hazel Park, Michigan, USA
Track: EXTRUSION EQUIPMENT - Safety and Automation
ABSTRACT—Dummy block lubrication has changed significantly over the years with the
inception and evolution of the fixed dummy block and hot log shear, and the elimination of the
popular acetylene sooters. More recently, the transition to short stroke front-loading presses, hot
log saws, and the complete guarding of the extrusion press has further impacted dummy block
lubrication. These changes are driven by the need to automate and speed up the process, and this
further exacerbates the importance of proper lubrication. Two technologies have come to the
forefront to lubricate either the back side of the billet or the dummy block directly. They are:
Boron Nitride-based ceramic powders, which are electrostatically applied; and organic liquid
polymer-based solutions, which are air atomized. Both have advantages and disadvantages.
Further, both technologies have evolved over many years in order to improve reliability and
reduce overuse of lubricant and the subsequent overspray. This article will explore the evolution
and development of both technologies with a look to the future and what is still to come.
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