Abstract
Due to growing challenges regarding crash-performance, CO2 emission as well as increasing demand for lightweight construction, hot metal forming of car body parts has risen to one of the most important technologies for saving weight of a car body. During hot forming shaped blanks of steel are heated and austenitized at around 950°C and subsequently quenched for martensitic formation. Currently the heating is realized in roller hearth furnaces which allow only a slow heating and, therefore, a limited production rate. Induction heating of the blanks offers a big potential to increase the production rate dramatically and also to improve the energy efficiency. Only due to the fact, that the heated blanks typically are already pre-shaped with holes and cut-outs induction heating becomes a very complex task. The paper compares different possible induction heating methods (longitudinal heating, transverse flux heating, single stage induction heating, hybrid heating by induction and conventional heating). For the case of single stage induction heating a detailed numerical and experimental investigation in the frame of a recently completed research project is presented.
Highlights
Nowadays conventional heaters with oil or gas are mainly used in industry for the heating of high strength steel workpieces
Due to growing challenges regarding crash-performance, CO2 emission as well as increasing demand for lightweight construction, hot metal forming of car body parts has risen to one of the most important technologies for saving weight of a car body
In comparison with conventional heating methods induction heating offers a lot of advantages, which are mainly based on the principle of direct heating within the heated material
Summary
Nowadays conventional heaters with oil or gas are mainly used in industry for the heating of high strength steel workpieces. The potential to heat blanks above the Curie temperature is described in [3,4] using single side induction heaters. For nearly flat materials with constant cross-section the longitudinal induction heating concept can be applied, ensuring a homogenous temperature profile.
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