Accession Number : AD0763056

Title :   An Experimental Investigation of Fluid-Film Lubrication in Hydrostatic Extrusion Using Wax to Simulate Metals,

Corporate Author : QUEEN'S UNIV KINGSTON (ONTARIO)

Personal Author(s) : Rice,W. B. ; Iyengar,H. S. R.

Report Date : 1970

Pagination or Media Count : 7

Abstract : The paper describes hydrostatic extrusion experiments in which paraffin wax was extruded, undertaken to test the validity of a theory, previously proposed by the authors, concerning the conditions necessary for fluid-film lubrication. Minor pressure fluctuations observed at relatively low billet speeds are attributed to the difference between static and dynamic friction under boundary lubrication conditions. Violent pressure fluctuations observed at higher speeds are attributed to the difference between static friction and that associated with fluid-film lubrication. The decreasing magnitude of successive peaks is attributed to progressive wetting of the die-billet surface which takes place during successive periods during which the billet velocity exceeds the threshold value. Existence of bands of oil observed on that portion of the billet which moved into the die during the period of violent fluctuations is cited in support of the progressive wetting mechanism. (Modified author abstract)

Descriptors :   (*LUBRICATION, *EXTRUSION), HYDROSTATIC PRESSURE, FILMS, SIMULATION, WETTING, CANADA

Subject Categories : Lubricants and Hydraulic Fluids
      Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE