| 摘要 |
PURPOSE:To avoid a forming failure, rationalize the pressing process, strengthen a member and lighten the member by using a solid shaped body of a near net shape made in one body by laser welding. CONSTITUTION:A metal plate is cut into plural specific flat plane like pieces, plural specific solid shaped metal shells are formed by pressing or rolling, and these metal plates and metal shells are assembled into a solid shaped body for press forming to be obtained. For example, a raw material of bottom part 10 and parts of a side wall 11 are assembled. They are assembled into a solid shape, and joined integrally by laser welding. Using this solid shaped body for press forming, a press formed product is produced in which the maximum strain in welding part is regulated to <=10%. Therefore, in the case of pressing a hard-to-work material, the forming failure can be avoided with a comparatively few pressing processes, and the hard-to-work material such as a high-strength steel plate can effectively be utilized. |
