Edited by: S. Ekinović; S. Yalcin, J. Vivancos Journal of Trends in the Development of Machinery and Associated Technology Vol. 18, No. 1, 2014, ISSN 2303-4009 (online), p.p. 71-74 SIMULATION OF THE HEAT DISTRIBUTION BY THE FORWARD COLD FLOW FORMING Ibrahim Plančić, Malik Čabaravdić, Edin Begović University of Zenica, Faculty of Mechanical Engineering, B&H Sebastian Härtel Technische Universität Chemnitz, Department Mechanical Engineering, Institute for Machine Tools and Production Processes, Reichenhainer Straße 70, 09126 Chemnitz, Germany Stefan Kleditzsch TOGO SCHERDEL GmbH, Am Federnwerk 1, 09496 Marienberg, Germany ABSTRACT The process of forward cold flow forming is a specific procedure of material processing which is used for forming of different rotationally symmetric parts from cylindrical workpieces placed between the pin and roll in the military, aeronautical, nuclear and other industries. Under the pressure of the rolls (two or three rolls) material is brought to the state of plastic flow and extruded in the axial direction, what results in the reduction of the diameter and increase of the length of workpiece. The deformation of workpiece causes the increase of the heat during the processing. In this paper, the temperature analysis of tubular workpieces Al 99.5 during the processing by cold flow forming is shown. The numerical simulation of the process was carried out using simufact.forming GP 11.0 software. In the next step the results of numerical simulations were experimentally verified by measuring the temperature of heated workpieces during the forming with the help of contactless thermal imaging methods (Thermo-camera Fluke Thermography Series These 32). Key words: process simulation, workpiece temperature, forward cold flow forming, Al 99,5 % 1. INTRODUCTION Forward cold flow forming is a processing procedure for producing hollow cylindrical parts with constant or variable thickness of the wall using roller-shaped tools with the special pins (Fig. 1). The core of this procedure is to bring the material to the state of plastic flow and extrude it in the axial direction under the pressure of the rolls (two or three rolls), resulting in the reduction of the diameter and increasinge of the length of workpiece. The deformation occurs in a narrow contact zone between the rolls and the material. Because the material is mostly processed in cold state, the effect of its strengthening takes place, causing the improvement of its mechanical properties. Because of the applied pressure during processing, a high concentration of energy arises, causing the heating of the material in the formating zoe deformation zone. The temperature in the deformation zone depends mostly on the type of the material, the forming speed/ velocity oder plastic strain rate and the achieved plastic strain. Results of the available experiments show that the temperature of workpiece in deformation zone by processing of steel is between 200 ºC and 350 ºC. To preserve the positive effects of the cold forming, the deformation zone must be intensively cooled. The cooling is performed using appropriate oil emulsion, which is through appropriate nozzles sprayed into the zone of deformation. Determination of the workpiece’s temperature during the processing is a very important task. Its value can directly indicate the performance of the material strengthening and cooling efficiency during processing.