| 摘要 |
PURPOSE:To shorten the time of gear cutting greatly and utilize the surplus heat for the quenching process of gears by heating a work to be cut into a gear continuously or intermittently using a high-frequency induction heating coil so as to perform gear cutting while the work is held within a certain thermal range. CONSTITUTION:A hob 10 is provided with spirally stretching cutting edges 12, traversed by a number of grooves 13. Cutting edge 12 is formed from CBN sintering, ceramic or extra-hard alloy. The hob 10 is fitted on a hob shaft 14, being borne by a tool unit 16 rotatably, wherein an air nozzle 20 at the tip of a cooling air supply pipe 18 is installed at the gap formed between the hob 10 and a recess in unit 16. The work 22 of steel to be cut into a gear is nipped by No.1 jig in ceramic etc. (not illustrated), No.2 jig 26 and No.3 jig 28 in the direction from over and under. A high-frequency induction coil 46 is arranged around the work 22, consisting of an upper magnetic pole 48, lower magnetic pole 50 and winding 52. A touchless thermo-sensor 56 is installed close to the work 22. |
