Friction in metal powder pressing : measurement and characterisation

Abstract: The present work describes different methods for measuring and characterisation of friction in powder compaction process. A new test apparatus has been developed and presented which gives possibility of directly measurement of coefficient of friction during pressing from low to relative high density. It also allows investigation of the surfaces in contact at different values of density. Influences of different parameters on friction in this process have been investigated. The nature of friction in the process has been discussed and also an attempt of modelling the process has been presented. Appended papersI. Measurement of friction during metal powder compaction, “PM98 world congress in powder metallurgy, Vol. 2, 120-125; 1998, Granada, Spain II. Wall Friction Coefficient Estimation by Modelling of Powder Die Pressing Experiment. Powder Metallurgy Vol. 43, No. 2, 132-138, 2000. III. Dependence of Friction on Various Parameters in the Metal Powder Compaction Process. PM2TEC Advances in powder metallurgy & Particulate materials, Part 2, 33-44. 1999, Vancouver, Canada. IV. A New Method for the Measuring and Characterisation of Friction at a Wide Range of Densities in Metal Powder Compaction. Submitted to Powder Metallurgy December 2001 V. Die-wall Friction and the Influence of some Process Parameters on Friction in Metal Powder Compaction. Submitted to Powder Metallurgy April 2002.