METHOD AND STAMPING TOOL FOR HOT TREATMENT WITH PRESSURE AND HARDENING UNDER PRESSURE OF Billets FROM STEEL SHEET, IN PARTICULAR, GALVANIZED Billets From STEEL SHEET

摘要

1. The method of hot forming and pressure hardening of plate or preformed blanks (1) from a steel sheet, in particular galvanized blanks (1) from a steel sheet, in which the blank is heated to a temperature above the austenization temperature and then in a cooled stamping tool, which has at least one die (2) and at least one matrix (3), is subjected to plastic deformation and hardening, characterized in that it is used for hot forming and pressure hardening m the matrix (3) in its defined by the positive radius of extrusion, the edge region of the extrusion is inextricably coated with material (6, 6 ′) and / or provided with at least one insertion element (5), which has a thermal conductivity of at least , 10 W / (m · K) less than the thermal conductivity of the portion (3.1) of the matrix (3) adjacent to the edge stretching zone, which comes into contact with it during hot working or pressure quenching of the workpiece (1), and facing the workpiece (1) the surface deposited in the edge zone not pulling the material (6, 6 ′) or the insert element (5) located there, has a transverse dimension extending along the edge of the pull (7), the value of which lies in the range from 1.6 times to 10 times the positive radius of the matrix (3) .2. A method according to claim 1, characterized in that the thermal conductivity of the insert element (5) or the deposited material (6, 6 ′) located in the edge zone of the extrusion is less than 40 W / (m · K), preferably less than 30 W / (m · K ) .3. A method according to claim 1 or 2, characterized in that at least one insertion element (5) �