The spring-back and bow phenomenon in the roll forming process are important factors regarding the accuracy of evaluation of production goods. The purpose of this study was to determine the influence of spring-back and bow phenomenon according to the main variables (forming velocity and roll gap). The material of the forming sheet was high tension steel (SPFH 590), which has been used commonly in recent years. In order to accurately measure the spring-back and bow phenomenon, the forming sheet was formed into a V-shape. The study was applied to OFAT (One Factor at a Time) experimentation, with respect to the experimental variables (the forming speed and the roll gap). In the experimental results, the forming speed had a small influence on the spring-back and bow phenomenon. However, the roll gap had a greater influence on the springback and the bow phenomenon, as opposed to the forming speed.

Tension (geology)

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스피닝 머신용 대형주축의 열특성에 관한 연구

한국정밀공학회 학술발표대회 논문집 (2005)

정동수 김수태 최대봉 예성봉 설상석

Spinning process is a chipless metal forming method for axis-symmetric parts, which is more economical, efficient and versatile method for producing parts than other sheet metal forming process such as stamping or deep drawing. The large-sized spindle for spinning machine is the equipment to form a high-pressure vessel into the demanded shape. The important problem in the spindle system for spinning machines is to reduce and minimize the thermal effect by motor and bearings. In this study, the effect of heat generation of bearings for the large-sized Spindle is considered. Temperature distribution and thermal displacement of the spindle system for spinning machine can be analyzed by using the finite element method. The numerical results are compared with the measured data. The results show that temperature distribution and thermal displacement can be reasonably estimated by using the finite element method and the three dimensional model.

Machine tool

Heat Generation

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일체형 중공 드라이브 샤프트 제작을 위한 점진적 열간 로터리 단조 공정 조건 예측

한국정밀공학회지 (2016)

이호진 국대선 안동규 정종훈 설상석

A monobloc tubular drive shaft is designed to obtain the improved structural safety and the weight reduction of the drive shaft together. The monobloc tubular drive shaft can be manufactured from an incremental hot rotary forging process. The aim of this study was to experimentally determine conditions of an incremental hot rotary forging process for a monobloc tubular drive shaft. Induction heating experiments were performed to estimate a proper heating time of an initial workpiece in an induction heating process. Several incremental hot rotary forging experiments were carried out using a mechanical press with the designed set-up. The step distance and the step angle were chosen as controllable forming parameters. Based on the results of the experiments, the influence of forming parameters on the quality of the forged part was investigated. Finally, a forming map and a proper forming condition of the incremental hot rotary forging process were estimated.

Induction Heating

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AMESIM을 이용한 동 파이프 피팅 시스템의 유압회로 최적화

한국정밀공학회 학술발표대회 논문집 (2009)

박수성 정원지 설상석 권구흥

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자동차용 이음매 없는 고강도 중공 드라이브 샤프트 인발공정 최적화 연구

한국정밀공학회 학술발표대회 논문집 (2014)