Bjarne Gottlieb Ravn

Development of a commercial transducer for measuring pressure and friction on a model die surface

Abstract Production of components close to the final shape increases the demand for correct dimensions of tools. In processes where the internal pressure is low, the dimensions of the component reflect the dimensions of the die-cavity in the tool, but in processes where the internal pressure is high, die deflection in the tool causes incorrect shape of the final component. The dimensions of the die-cavity have to be corrected taking into account die deflection due to the high internal pressure. The modelling material technique is suitable for measuring internal pressure, but so far only a transducer to measure normal pressure has been available.

Verification of the component accuracy prediction obtained by physical modelling and the elastic simulation of the die/component interaction

Abstract There are three demands on a component that must undergo a die-cavity elasticity analysis. The demands to the product are specified as: (i) to be able to measure the loading profile which results in elastic die-cavity deflections; (ii) to be able to compute the elastic deflections using FE; (iii) compensating the elastic deflection must lead to closer product tolerances and thus a higher-value product.

Pressure contours on forming dies: Part 1. Simulation using physical modelling technique

Abstract In contemporary practice, tool design and its optimisation is accomplished largely through the use of empirical knowledge and extensive experience. A considerable amount of trial and error is necessary in order to be able to set-up a tool for a reliable and reproducible process. One of the major aims of cold-forging research, therefore, is to reduce this trial and error procedure. This can be achieved by means of the physical model technique combined with the necessary calculations.