초록 ▼

In the press hardening process when a blank is formed and cooled in cooled tools (30,31), the tools are used as a fixture during the hardening. The tools have alternately contact surfaces (33,34) and clearances (35) in a certain area against the formed product (20-24) and the contact surfaces have a

In the press hardening process when a blank is formed and cooled in cooled tools (30,31), the tools are used as a fixture during the hardening. The tools have alternately contact surfaces (33,34) and clearances (35) in a certain area against the formed product (20-24) and the contact surfaces have an area that is less than 20% of the area. As a result, this area will be a soft zone (11) of the final product and the zone will have good dimensional accuracy.

대표청구항 ▼

The invention claimed is: 1. A method of hot stamping a flat sheet metal blank to a product (20-24) in a cooled pair of tools (30, 31) and hardening of the formed product in the pair of tools using them as fixture, wherein both tools of the pair of tools have an area with a clearance (35) to the fo

The invention claimed is: 1. A method of hot stamping a flat sheet metal blank to a product (20-24) in a cooled pair of tools (30, 31) and hardening of the formed product in the pair of tools using them as fixture, wherein both tools of the pair of tools have an area with a clearance (35) to the formed product so that a soft zone (11) is formed in the product, characterised in that in order to get a product (20-24) that has a good tolerance also in the soft zone (11), the tools have, in said area, discrete smaller contact surfaces (33, 34) to the product, said contact surfaces comprising less than 25% of the area of the soft zone. 2. A method according to claim 1, characterised in that tools are used, in which said contact surfaces (33, 34) comprise less than 20% of the area of the soft zone. 3. A method according to claim 1, characterised in that, tools are used, in which said contact surfaces (33, 34) in said zone are formed as lines. 4. A method according to claim 1, characterised in that, tools are used, in which said contact surfaces (33, 34) in said zone are spots. 5. A method according to claim 1, characterised in that, tools are used, in which said contact surfaces (33, 34) in said zone are less than 5 mm in width. 6. A method according to claim 1, characterised in that, tools are used, in which said contact surfaces (33, 34) in said zone are less than 2 mm in width. 7. A method according to claim 2, characterized in that, tools are used, in which said contact surfaces (33, 34) in said zone are formed as lines. 8. A method according to claim 2, characterized in that, tools are used, in which said contact surfaces (33, 34) in said zone are spots. 9. A method according to claim 2, characterized in that, tools are used, in which said contact surfaces (33, 34) in said zone are less than 5 mm in width. 10. A method according to claim 3, characterised in that, tools are used, in which said contact surfaces (33, 34) in said zone are less than 5 mm in width. 11. A method according to claim 4, characterised in that, tools are used, in which said contact surfaces (33, 34) in said zone are less than 5 mm in width. 12. A method according to claim 7, characterised in that, tools are used, in which said contact surfaces (33, 34) in said zone are less than 5 mm in width. 13. A method according to claim 8, characterised in that, tools are used, in which said contact surfaces (33, 34) in said zone are less than 5 mm in width. 14. A method according to claim 2, characterised in that, tools are used, in which said contact surfaces (33, 34) in said zone are less than 2 mm in width. 15. A method according to claim 3, characterised in that, tools are used, in which said contact surfaces (33, 34) in said zone are less than 2 mm in width. 16. A method according to claim 4, characterised in that, tools are used, in which said contact surfaces (33, 34) in said zone are less than 2 mm in width. 17. A method according to claim 5, characterised in that, tools are used, in which said contact surfaces (33, 34) in said zone are less than 2 mm in width. 18. A method according to claim 7, characterised in that, tools are used, in which said contact surfaces (33, 34) in said zone are less than 2 mm in width. 19. A method according to claim 8, characterised in that, tools are used, in which said contact surfaces (33, 34) in said zone are less than 2 mm in width.