열간 선재 압연기에서 작업롤 베어링의 외측링 파손에 관한 연구 = Study on Failure in Outer Ring of Work Roll Bearing in Hot Rod Rolling Mill

다국어 초록 (Multilingual Abstract)

A finite element analysis-based approach which investigates the causes of the breakdown in the outer ring of the choke at hot rod rolling mill is presented. Two-dimensional drawings of the whole vertical-type mill stand are transformed into three-dimensional CAD models. Non-linear elasto-plastic deformation analysis of material at the roll gap is performed for computing roll force and torque of the work roll. Then, the reaction forces of the bearing rings together with a set of roller bearings that support the work roll are obtained by means of rigid body motion analysis. Finally, stress behaviors in the bearing rings together with a set of roller bearings that support the work roll are investigated by linear elastic analysis. Results reveal that stress at the contact area between the outer ring and roller bearing is extraordinary high when an internal gap between an external surface of the outer ring and the internal surface of the chock due to wear of the inside of the chock occurs.

목차 (Table of Contents)

• ABSTRACT
• 1. 서론
• 2. 공정 분석 및 문제 정의
• 3. 압연 스탠드의 유한요소해석
• 4. 결과 및 고찰
• 5. 결론
• REFERENCES

참고문헌 (Reference)

1 한문식, "자전거 허브 베어링의 구조적 내구성 해석에 관한 연구" 한국기계가공학회 14 (14): 99-104, 2015

2 변상민, "열간 조압연공정에서 판 캠버 저감을 위한 사이드 가이드 동적설정에 관한 연구" 한국기계가공학회 15 (15): 34-41, 2016

3 Brusa, E., "Vibration Analysis of a Sendzimir Cold Rolling Mill and Bearing Fault Detection" 224 (224): 1645-1654, 2010

4 Kappaganthu, K., "Modeling and Analysis of Outer Race Defects in Rolling Element Bearings" 11 (11): 371-384, 2012

5 Kabo, E., "Material Defects in Rolling Contact Fatigue-Influence of Overloads and Defect Clusters" 24 (24): 887-894, 2002

6 Tabacaru, L., "Influence of the Driving Roll Speed on the Roughness and Shape Deviations of the Running Tracks of Cold Worked Bearing Rings" 14 : 18-22, 2009

7 Farina, M., "Fault Detection and Isolation of Bearings in a Drive Reducer of a Hot Steel Rolling Mill" 39 : 35-44, 2015

8 Shida, S., "Empirical Formula of Flow Stress of Carbon Steels - Resistance to Deformation of Carbon Steels at Elevated Temperature" 10 : 610-617, 1969

9 Byon, S. M., "Effect of Roll Gap Adjustment on Exit Cross Sectional Shape in Groove Rolling-Experimental and FE Analysis" 209 (209): 4465-4470, 2009

10 Hua, L., "Effect of Material Defects on Crack Initiation under Rolling Contact Fatigue in a Bearing Ring" 66 : 315-323, 2013

11 Song Deng, "A study on the effect of subsurface crack propagation on rolling contact fatigue in a bearing ring" 대한기계학회 29 (29): 1029-1038, 2015