Starting from the mechanical analysis and the parameter calculation of the deformation zone in line with the characteristics of ring rolling,the article introduces the concept of equivalent friction coefficient as well as its calculation presented in the form of process paramters.

To study the friction coefficient during particle impact on metal, an effective friction coefficient is defined as a combination of shearing term and ploughing term at each instant.

An effective friction coefficient relevant to impact wear is defined as the ratio of the effective friction force in the tangential direction to the load in normal direction at each instant.

Study on the friction coefficient of PCBN compact based on cutting force;

Research on new test method of friction coefficient in extrusion process;

On the friction coefficient of diffusion coefficient model;

Research on determining friction factor in column compression by meshless method;

Study on Workpiece vs Mandrel Velocity and Friction Factor Relationship of Fully-floating Mandrel Mill(Part I);

A study on lowering friction factor of rubber materials by acid treatment;

Experimental testing is used to measure the dynamic frictional coefficient of the brake-tile on the working condition of simulated promotion.

Tested the frictional coefficient of natural coloured cotton fibers,get that the frictional coefficient of natural coloured cotton is small.

How to measure the frictional coefficient between sheet blank and die quantificationally by experiments is still a problem for the research work on sheet metal forming.