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외연적 유한요소법을 이용한 자동차 Hub Bearing의 Orbital forming 해석
조현직(Hyunjik Cho),구정서(Jeongseo Koo),배원락(Wonrak Bae),임종순(Jongsoon Lim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper was analysed the orbital forming of an automotive hub bearing using the explicit finite element method. To find an efficient solution technique on the orbital forming, axisymmetric finite element model s and 3D solid element models were solved and compared numerically. The time scaling and mass scaling techniques were used to reduce long computational time for fine element models in case of using the explicit finite element method. It was found from the numerical results that the axisymmetric element models showed the similar results to the 3D solid element models in forming loads whereas the deformations of them caused by O/F were quite different.
외연적 유한요소법을 이용한 자동차 Hub Bearing의 Orbital Forming 해석에 관한 연구
조현직(Hyunjik Cho),구정서(Jeongseo Koo),배원락(Wonrak Bae),임종순(Jongsoon Lim) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.1
In this paper, the orbital forming analysis of an automotive hub bearing was studied to predict forming performances using the explicit finite element method. To find an efficient solution technique for the orbital forming, axisymmetric finite element models and 3D solid element models were solved and numerically compared. The time scaling and mass scaling techniques were introduced to reduce the excessive computational time caused by small element size in case of the explicit finite element method. It was found from the numerical simulations on the orbital forming that the axisymmetric element models showed the similar results to the 3D solid element models in forming loads whereas the deformations at the inner race of bearing were quite different. Finally the strains at the inner race of bearing and the forming forces to the peen were measured for the same product of the numerical model by test, and were compared with the 3D solid element results. It was founded that the test results were in good agreements with the numerical ones.
정창현(Changhyun Jeong),정도현(Dohyun Jung),배원락(Wonrak Bae) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.19 No.6
We presented design methodology of constant velocity joint for passenger cars using design of experiment. On the basis of contact normal stress of internal components of constant velocity joints, we performed a sensitivity analysis of several design parameters. And then we performed robust design and optimization design process. As a result, we could find robust design and also propose the optimized design. Presented design process would be very helpful for engineers who are suffer for new constant velocity joint design.
이중 퀜칭 열처리 공정을 이용한 베어링강의 입자미세화에 관한 연구
이광오(Kwango Lee),홍석기(Seokki Hong),강성수(Sungsoo Kang),배원락(Wonrak Bae),임종순(Jongsoon Im) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It's known that high carbon bearing steels with fine grain size are superior in fatigue properties than conventional high carbon bearing steels. In this investigation, double quenching process was proposed to improve fatigue life by grain refinement of high carbon bearing steel. Microstructures were investigated by means of optical microscope, within JIS-SUJ2(SAE 52100) bearing steel we have produced a prior-austenite grain size of approximately up to 5 ㎛ in diameter. Secondary quenching temperatures and holding time were 780℃, 800℃, 820℃, 20min, 40min, 60min, and we performed for each condition to optimize heat treatment cycles. Secondary quenching temperatures can be lower than conventional austenizing temperature, because nitrocarbonized bearing steels through first quenching process have lowered A1 temperature and grain refinement need low austenizing temperature. Bearing steels used in field need to satisfy required hardness as well as fine microstructures.