New forging method of bevel gears from structural steel

The paper discusses the problem of producing bevel gears in a single operation by complex forging of structural steel on a press with reversibly rotating die (the KOBO method). Within the scheme of investigations there have been carried out measurements and analyses of the force parameters of the process as well as structural observations and mechanical tests of forgings produced at various temperatures. Additionally, the forging process using the KOBO method was compared with the conventional forging giving special attention to the possibility of obtaining products of good quality. It has been found that the KOBO method used in the forging process of structural steel in closed dies enables its plastic shaping under the influence of rather small force of the punch pressure and temperature, considerable lower than that usually applied during conventional forging. In spite of this reduction, the forgings showed correct representation by the die shape, homogeneous structure and good mechanical properties.