|제목(국문)||등속조인트용 외륜의 다단 냉간 단조공정에 관한 실험적 연구|
|제목(영문)||Experimental Study on Multi-Stage Cold Forging for an Outer Race of a CV Joint|
(B. S. Kang
This study deals with a series of experimental investigations on multi-stage cold forging of an outer race used for a constant velocity (CV) joint with six inner ball grooves. The multi-stage cold forging, which consists of forward extrusion, upsetting backward extrusion, and combined sizing-necking including ironing, was used to produce a prototype ofthe outer race ThJ cold forging tools such as forging punches and dies required in this 腿lti-stage cold forging were also designed and fabricated. For the combined sizing-necking, especially, the longitudinally six-segmentallized punches were developed to easily eject from the necked inner groove ofthe outer race with consideration ofthe operating mechanism. Spheroidized SCr420H billet was used in the experimental study. To verify the suitability ofthe proposed process, the obtained parts were obtained from each forging operation, and the geometries were compared with the target dimensions. It was confirmed that the outer race with six inner ball grooves was well forged by adopting the proposed multi-stage cold forging, and the dimensional accuracy ofthe forged outer race matched well with the requirements.
|keyword||Key Words : CV Joint, Outer Race, Multi-Stage Cold Forging, Tool Fabrication, Experimental Verification