This process depends on time and temperatures. It is possible to form parts while they are in soft states at a high temperature through hot forming and later quench them. Hot formation includes such operations as thermal furnace processing, transition from heat processing to pressing and drawing, plastic hot formation and quench process within close and cool die. Each part processed through hot formation is strong complex-shaped and produces minimum back spring effect. Proper material performance is provided due to textural converting of austenite to martensite. The widely applied hot formation material is Borton 22MNB5 and it can be gained from nearly every steel manufacturer. Direct and indirect hot formation processes are different
Direct hot formation steps: Blanking, heat processing, drawing.
In hot formation parts appear austenite at high temperatures, next they get transmitted to the cool die and get exposed to drawing. Thus, complex-shaped parts are produced for the material formation occurs properly at a higher temperature.
Indirect hot formation steps include blanking, primary drawing, heat processing and final drawing.
While hot forming indirectly, parts first get deeply drawn with no heat. Prior to obtaining complete shapes, parts get heated up to austenite temperature, only then the second draw operation is accomplished. The aim of the extra drawing is to extend formation capability and make it possible to gain more complex shapes.
Hot formation process has reached a wide use in automobile industries to meet special needs of high crash security as well as low total weight. Most automobile producers apply hot forming to make car structure frame parts like an A and B pillar, tunnel, head and back bumper beam, door sill or beam, side-rail, roof-rail and roof frame.
Hot formation process is relatively complicated as compared with conventional formation process. Hot formation ensures producing highly strong, complex-shaped parts featured with the least back spring properties within short periods of time.