Acta Mechanica Slovaca 2019, 23(4):30-36 | DOI: 10.21496/ams.2020.004

The Impact of Prestressed die Construction with Cemented Carbide Insert on Stress Distribution During Extrusion

Stanisław Kut¹, Irena Nowotyńska²

¹ Rzeszow University of Technology, The Faculty of Mechanical Engineering and Aeronautics, Department of Materials Forming and Processing, Al. Powstańców Warszawy 8, 35-959 Rzeszów, Poland

² Rzeszow University of Technology, The Faculty of Management, Department of Computer Engineering in Management, Al. Powstańców Warszawy 8, 35-959 Rzeszów, Poland

An important parameter for optimizing tool life is the introduction of a pre-compression stress in the die insert through the use of the compression ring. The tests were carried out for a die with a cemented carbide insert. Three die construction solutions were used in the tests. They differ by the ratio of the wall thickness of the die insert to the wall thickness of the compression ring g_m/g_p = (0.57; 1; 1.75) while maintaining a constant tool diameter. All construction solutions using cemented carbide insert were analysed for three values of mounting interference amounting to d = (0.004; 0.008; 0.016) mm. On the basis of the results obtained, the degree of impact of the parameters examined (the interference value d and the ratio g_m/g_p) on the distribution and level of circumferential stress in a die compressed by a single ring using a cemented carbide insert were determined. It was shown that the size of the interference and the quotient (g_m/g_p) had the great impact on the reduction of working stresses in the die insert.

Keywords: extrusion; die compressed; cemented carbide insert; stress distribution

Published: December 20, 2019  Show citation