METHOD FOR PRODUCING METAL FORGED PRODUCT

PROBLEM TO BE SOLVED: To provide a method for producing a metal forged product, which improves the mechanical properties, leaves no burr removal mark in the forged product, uses a cylindrical material having a surface layer on the circumferential surface thereof for labor saving in the process, and...

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Bibliographische Detailangaben
Hauptverfasser:	NAKAHARA TAKAFUMI, AKIYAMA MITSUHARU
Format:	Patent
Sprache:	eng
Schlagworte:	FORGE FURNACES FORGING HAMMERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PRESSING METAL PUNCHING METAL RIVETING TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for producing a metal forged product, which improves the mechanical properties, leaves no burr removal mark in the forged product, uses a cylindrical material having a surface layer on the circumferential surface thereof for labor saving in the process, and is suitable for enhancing the yield of the material relative to a forging material.SOLUTION: The 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 302 is contained in a surface region of the preform; and an intermediate forging step of subjecting the preform to forging to thereby extrude the surface layer in the form of burr outside a periphery of a forged product.