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The TribSys Twist Compression Test
The Twist Compression Test is used to evaluate lubricants and die materials for application in metalforming processes.
 
The Twist Compression Test is a tribometer designed to measure friction and evaluate adhesion in metalforming. The TCT is effective because of several critical features.
 
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Contact pressures can be set to match the process
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Flat contact ensured through self-aligning tooling
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Depletion of lubricant without replenishment ensures boundary contact with liquid lubricants
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Simple contact model allows friction to be determined from Amonton’s laws of friction “the Frictional force is proportional to normal force, and it is independent of the size of the apparent contact area” (Schey, Tribology in Metalworking)
This test measures the transmitted torque between a rotating annular cylinder and a lubricated flat sheet specimen. The 25mm (1”) diameter annular cylinder is driven by a hydraulic motor for smooth delivery of the applied torque at speeds up to 30 RPM (90 inches/minute). The pressure may be adjusted up to 35,000 psi to best duplicate the tribological conditions of the metalforming process being studied. Data is collected electronically and the coefficient of friction is calculated from the ratio of transmitted torque to applied pressure.
 
 
 
 
The TCT is best used as a comparative rather than an absolute test. The simplicity of the TCT and good laboratory practice minimizes variations. However, it is advisable to include a reference for each series of evaluations.
 
 
 
                                        
                  
 
 


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