| 摘要 |
A product of sheet steel is formed in a pair of cooled tools when hot and is then hardened to a martensitic structure while still in the tools. In this manner, the tools function as a fixture while the steel is hardening. The steel is kept mild in the areas in which it is to be machined, for example punched. Inserts in the tools are used to prevent rapid cooling of the steel sheet and thereby a martensitic structure in the areas adjacent the inserts. The same effect can be obtained by recesses in the tools so that there will be a gap between the sheet steel and the tools. |
