Transactions of the Japan Society of Mechanical Engineers Series C
Online ISSN : 1884-8354
Print ISSN : 0387-5024
A Seizure Initiation Mechanism in Cold Metalworking Processes : 5th Report, Effect of Temperature
Tamotsu NAKAMURAHideyuki KINPARA
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1989 Volume 55 Issue 513 Pages 1289-1295

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Abstract

An extrusion-type friction test has been carried out to examine the critical conditions for seizure initiation at various temperatures using a commercially pure aluminium as a work metal and paraffinic mineral oils as a lubricant. As the test temperature increased or the lower the lubricant viscosity decreased, the critical punch stroke for seizure initiation decreased. The oil film thickness trapped in the micro-pools on the tool-work interface was reduced with an increase in the temperature or a decrease in the viscosity grade of lubricant. As a result, it has been clarified that the critical oil film thicknesses for seizure initiation were approximately constant ; 0.20.25μm.

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