| 摘要 |
PURPOSE:To improve a built-up gear hob, in which a plural number of cutting edges are implanted along the periphery of a hob body, to be more solid, by fixing the junction parts between said hob body and said cutting edges by means of a laser beam welding. CONSTITUTION:The back 4 of a cutting edge 2 is welded to the junction surface, opposite to the back 4, in a hob body 1, along the axial direction by means of a laser beam. That is, the cutting edge 2 is welded to the junction part of the hob body 1 by means of the laser beam, being completely fixed in an integrated form. Thereby, the cutting edge never comes up off from the hob body 1. The cutting edge 2 is not affected by heat and, furthermore, since the laser-beam welding can be carried out in the atmosphere, the size of equipment can be made small. |
