| Popis: |
Close tolerance forging of spiral bevel gears, requiring only a single or no finish machining operation, offers considerable advantages because this method of manufacture (a) reduces material losses and machining costs and (b) Increases the fatigue life of the gears. A few companies around the world are able to produce spiral bevel gears by precision forging. However, the development of the process for each new gear design requires usually a considerable amount of trial and error. Thus, application of computer techniques to die design and manufacture of the gear forging dies represents an attractive alternative. This paper describes the computer techniques, used for generating the spiral bevel tooth surface geometry by simulating the gear cutting process. Further, the calculation of die corrections, the manufacturing of EDM electrodes and of the forging dies are discussed. Finally, the results of forging trials are summarized and a brief progress report on this on-going development project is given. |
