Metal forged product, upper or lower arm, preform of the arm, production method for the metal forged product, forging die, and metal forged product production system
A method for producing a metal forged product having a plurality of branches includes a preliminary forging step of forming a preform by closed forging from a cylindrical material having a surface layer on a circumferential surface thereof such that the surface layer is contained in a surface region...
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| Format: | Patent |
| Sprache: | eng |
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