| 摘要 |
<p>PURPOSE:To prevent the generation of burrs by providing tooth profile forming parts and a die side open hole on the front of a blank material and pressurizing the blank material by a counter punch in plastic working of a bevel gear. CONSTITUTION:The die is constituted of the die 51 which is inscribed with the tooth profile forming parts 55 on the front of the charging part of the blank material 17 and is provided with the die side open hole 57 and the counter punch 61, the front end of which is placed in the tooth profile forming parts 55. After the blank material 67 is inserted into a blank material charging part 53, this blank material 67 is pressurized by a punch 63 formed with the punch side open hole 65 larger in diameter than the front end diameter of the counter punch 61 and the tooth profile parts are formed by forward extrusion. The blank material is simultaneously backward extruded into the punch side open hole. The generation of the burrs of the circular conical front end parts of the bevel gear into the dedendum parts is prevented in this way.</p> |
