发明名称 GEAR FORMING DIE AND EXTRUSION FORMING APPARATUS WITH THE GEAR FORMING DIE
摘要 PROBLEM TO BE SOLVED: To provide a gear forming die which, in extrusion working of a gear, enables the occurrence of unfilled part in gear formation to be suppressed without increasing a sectional area reduction ratio and consequently enables a gear having good formability to be formed even using a quenching material. SOLUTION: The gear forming die is provided with a columnar mandrel 110 and a cylindrical container 120. On an outer circumferential surface of the mandrel 110, a forming-tooth 113 for forming the tooth in the targeted gear is formed flush with a guiding surface 112. On an inner circumferential surface of the container 120, a pressing part 123 for pressing a blank WK to be formed to the forming-tooth 113, is formed. The pressing part 123 is provided with a preliminary forming part 123a on the upstream side for guiding the blank WK to be formed and a finishing part 123b below the preliminary forming part 123a. The preliminary forming part 123a is formed so as to project from a guiding surface 122 and the tooth having smaller shape than the targeted tooth is formed on the blank WK to be formed by pressing the blank WK to be formed to the tooth 113. COPYRIGHT: (C)2008,JPO&INPIT
申请公布号 JP2008221270(A) 申请公布日期 2008.09.25
申请号 JP20070061378 申请日期 2007.03.12
申请人 NATIONAL UNIV CORP SHIZUOKA UNIV 发明人 SAWAKI YOZO;YOSHIDA HAJIME
分类号 B21K1/30 主分类号 B21K1/30
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