• Title/Summary/Keyword: 2-Roll Bending Process

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A Process Analysis for Manufacturing the Sleeve Spring of the Torsional Vibration Damper (비틀림 진동감쇠기용 슬리브 스프링의 제조 공정 해석)

  • Hwang, Beom-Cheol;Bae, Won-Byong;Kim, Chul
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.12
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    • pp.94-101
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    • 2009
  • In diesel engines, it is inevitable that the torsional vibration is produced by the fluctuation of engine torque. Therefore, it is necessary to establish preventive measures to diminish the torsional vibration. The sleeve spring type damper is one of the preventive measures for reducing the torsional vibration. In this study, 2-roll bending process was proposed to manufacture sleeve spring; The program to calculate the initial radius including springback effect was developed and the FEA method to analyze elasto-plastic problem was verified through analysis of 90 degree bending process. The elasto-plastic analysis of 2-roll bending process was carried out by the FEA method verified to set a new criterion, and the new process design parameter(contact angle) in the 2-roll bending process was proposed.

Production of Laser Welded Tube for Automobile Bumper Beam from 60kgf/$\textrm{mm}^2$Grade Steel Sheet (60kgf/$\textrm{mm}^2$급 자동차 범퍼빔용 레이저 용접 튜브 제조기술 및 장치연구)

  • Seo, Jung;Lee, Je-Hoon;Kim, Jong-Soo;Kim, Jung-O;Kang, Hee-Sin;Lee, Moon-Yong;Jung, Byung-Hoon
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.7
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    • pp.136-144
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    • 2004
  • Optimal process and system to produce the laser welded tube for one body formed bumper beam are studied. The calculated size of tube is a thickness of 1.4mm, diameter of 105.4mm and length of 2000mm. The tube is shaped from a cold rolled high strength steel sheet(tensile strength: 60kgf/$\textrm{mm}^2$ grade). Two roll bending method is the optimal tube shaping process compared to UO-bending, bending on press brake, multi-step continuous roll forming and 3 roll bending methods. Weld quality monitoring and seam tracking along the butt-joint lengthwise to the tube axis are also studied. The longitudinal butt-joint is welded by the $CO_2$ laser welding system equipped with a seam tracker and plasma sensor. The constructed $CO_2$laser tube welding system can be used for the precision seam tracking and the real-time monitoring of weld quality. Finally, the obtained laser welded tube can be used for one-body formed automobile bumper beam.

A Study on The Curvature Extrusion for Automotive Aluminum Suspension Arm (자동차 알루미늄 서스펜션 암 곡률압출공정에 관한 연구)

  • Lee, Sang-Kon;Kim, Byung-Min;Oh, Kae-Hee
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.2
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    • pp.71-77
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    • 2009
  • In the automotive industry, aluminum is widely used to reduce the vehicle weight. Aluminum curved extruded components are used for the design of frame parts. This study investigates the curvature extrusion process to produce the aluminum curved suspension arm. In the curvature extrusion process, the bending process is simultaneously carried out with the extrusion process. Firstly, porthole extrusion was investigated by using FE analysis to produce aluminum suspension arm. And then the bending process condition was determined to produce the final suspension arm with the required curvature. In this research, the guide roll movement causes the bending of extruded product. The moving distance and velocity of guide roll were controlled to meet the required curvature of suspension arm. Finally, the curved suspension arm was manufactured by the curvature extrusion experiment under the proposed curvature extrusion condition.

A study on manufacturing of laser welded tube from 60kgf/$mm^2$Grade Steel Sheet for one-body forming (60kgf/$mm^2$급 일체화 성형용 레이저 용접 튜브 제조에 관한 연구)

  • Seo, Jung;Lee, Je-Hoon;Kim, Jung-Oh;Kang, Hee-Sin;Lee, Mun-Yong;Jung, Byung-Hoon
    • Proceedings of the KWS Conference
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    • 2003.11a
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    • pp.18-20
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    • 2003
  • Optimal processing and system to produce the laser welded tube for one body formed bumper beam are studied. The calculated size of tube is a thickness of 1.4mm, diameter of 105.4mm and length of 2000mm. The tube is shaped from cool rolled high strength steel sheet(tensile strength: 60kgf/$\textrm{mm}^2$ grade). Two roll bending method is the optimal tube shaping process compared to UO-bending, bending on press brake, multi-step continuous roll forming and 3 roll bending methods. Weld quality monitoring and seam tracking along the butt-joint lengthwise to the tube axis are also studied. The longitudinal butt-joint is welded by the $CO_2$ laser welding system equipped with a seam tracker and plasma sensor. The constructed $CO_2$ laser tube welding system can be used for the precision seam tracking and the real-time monitoring of weld quality. Finally, the obtained laser welded tube can be used for one-body formed automobile bumper beam.

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Development of Ceramic Roll Materials for Food Grinding Processing and Evaluation of Mechanical Behavior (식품분쇄용 세라믹 롤 재료 개발과 기계적 특성평가)

  • 강위수
    • Journal of Biosystems Engineering
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    • v.26 no.1
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    • pp.47-56
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    • 2001
  • In order to prevent the possibility of mixing of metal powder during food grinding processing with the metal roll mill this study was conducted to develope the materials of ceramics roll as a substitute of gray cast iron mill. Since the ceramics is brittle material and can be broken easily by a crack, it was needed to develope engineering ceramics roll materials with high elastic modulus and fracture toughness. Adding 0∼50 wt% Al$_2$O$_3$as densification additives to porcelain body material and forming the ceramics an different condition, mechanical properties were evaluated. The material structure’s densification process was analyzed by SEM and XRD. The evaluation of the mechanical properties of ceramics roll materials were compared and analyzed by non-destructive test using Young’s modulus and destructive test using 3-point bending strength and fracture toughness. The results showed several correlative results. Porcelain body material with 40 wt% Al$_2$O$_3$content heated at 1,200$\^{C}$ for 5h was high bulk density of 2.77, Young’s modulus of 118.4Gpa, 3-point bending strength of 137 MPa and fracture toughness of 2.88 MPa$.$m$\^$$\sfrac{1}{2}$/ . After analyzing the relationship between non-destructive test and destructive test, the coefficient of determination was more than 0.9. Therefore, the evaluation of non-destructive test by ultrasonic was turned out to be feasible in evaluating the mechanical properties of ceramics.

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The Influence on the Bar Straightness and Plastic Deformation the Roll Intersection Angle of a Two Roll Straightene (2roll 교정기의 교차각이 봉의 직진도와 소성변형에 미치는 영향)

  • Kim, Yong;Lee, Seong-Wook;Han, Dong-Seop;Han, Geun-Jo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.6 no.4
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    • pp.76-80
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    • 2007
  • Two roll straightener showed the remarkable improvement in straightness betterment of the bar compared with other types of straightener. So, in this study we designed a two-cross straightener curvature for the straightness improvement of a bar and contact sections with respect to the variation of the gap between two-cross roll using nonlinear contact analysis. The Displacement in terms of a intersection angle between roll and bar was predicted on with the effect of a straightness and plastic deformation behaviors of the bar according to the roll drive of a two cross-roll straightener.

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OPTIMAL PROCESSING AND SYSTEM MANUFACTURING OF A LASER WELDED TUBE FOR AN AUTOMOBILE BUMPER BEAM

  • Suh, J.;Lee, J.H.;Kang, H.S.;Park, K.T.;Kim, J.S.;Lee, M.Y.;Jung, B.H.
    • International Journal of Automotive Technology
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    • v.7 no.2
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    • pp.209-216
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    • 2006
  • A study has been conducted for an optimal processing and an apparatus for manufacturing a laser welded tube for one-body formed bumper beam. The tube dimensions used in calculation were the thickness of 1.4 mm, the diameter of 105.4 mm and the length of 2000 mm. The tube was formed of a cold rolled high strength steel plate(tensile strength of 600 MPa). The two-roll bending method was the optimal tube forming process in comparison with the UO-bending method, the bending method on the press brake, the multi-step continuous roll-forming method and the 3-roll bending method. Monitoring of the welding quality was conducted and the seam tracking along the butt-joint lengthwise to the tube axis was also examined. The longitudinal butt-joint was welded by using a $CO_2$ laser welding machine equipped with a seam tracker and a plasma sensor. The $CO_2$ laser tube welding machine could be used for precise seam tracking and real-time monitoring of the welding quality. As a result, the developed laser welded tube could be used for a one-body formed automobile bumper beam.

Process Analysis and Test for Manufacturing the Sleeve Spring Type-Torsional Vibration Damper (슬리브 스프링 형식 비틀림 진동감쇠기 제조를 위한 공정해석 및 시험)

  • Hwang, Beom-Cheol;Bae, Won-Byong;Jang, Young-Jun;Kim, Chul
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.33 no.12
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    • pp.1471-1481
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    • 2009
  • In diesel engines, it is inevitable that the torsional vibration is produced by the fluctuation of engine torque. Therefore, it is necessary to establish preventive measures to diminish the torsional vibration. The sleeve spring type damper is one of the preventive measures for reducing the torsional vibration. In this study, the closed form equations to predict the spring constant of a sleeve spring and the torsional characteristics of the torsional vibration damper are proposed to calculate stiffness of the damper and verified their availability through the finite element analysis and experiments. And the stability of the sleeve spring torsional vibration damper is verified by analyzing the inner star and outer star, which are the core parts of the damper, and 2-roll bending process is proposed to manufacture sleeve spring. The program to calculate the initial radius including spring-back effect is developed, and the FEA method to analyze elasto-plastic problem was verified through analysis of 90$^{\circ}$bending process. The results of the analysis are in good agreements with those of the experiments. The newly proposed method can be used as an advanced technique that remarkably curtails cost of production and replaces the conventional forming.

Design of shearing process to reduce die roll in the curved shape part of fine blanking process (파인블랭킹 공정에서의 곡률부 다이롤 감소를 위한 전단 공정 설계)

  • Yong-Jun Jeon
    • Design & Manufacturing
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    • v.17 no.3
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    • pp.15-20
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    • 2023
  • In the fine blanking process, which is a press operation known for producing parts with narrow clearances and high precision through the application of high pressure, die roll often occurs during the shearing process when the punch penetrates the material. This die roll phenomenon can significantly reduce the functional surface of the parts, leading to decreased product performance, strength, and fatigue life. In this research, we conducted an in-depth analysis of the factors influencing die roll in the curvature area of the fine blanking process and identified its root causes. Subsequently, we designed and experimentally verified a die roll reduction process specifically tailored for the door latch manufacturing process. Our findings indicate that die roll tends to increase as the curvature radius decreases, primarily due to the heightened bending moment resulting from reduced shape width-length. Additionally, die roll is triggered by the absorption of initial punch energy by scrap material during the early shearing phase, resulting in lower speed compared to the product area. To mitigate the occurrence of die roll, we strategically selected the Shaving process and carefully determined the shaving direction and clearance area length. Our experiments demonstrated a promising trend of up to 75% reduction in die roll when applying the Shaving process in the opposite direction of pre-cutting, with the minimum die roll observed at a clearance area length of 0.2 mm. Furthermore, we successfully implemented this approach in the production of door latch products, confirming a significant reduction in die roll. This research contributes valuable insights and practical solutions for addressing die roll issues in fine blanking processes.

An Effect of Process Parameters on the Generation of Sheet Metal Curvatures in the Incremental Roll Forming Process (점진적 롤 성형 공정에서 공정 변수가 박판 금속의 곡률 생성에 미치는 영향)

  • 윤석준;양동열
    • Transactions of Materials Processing
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    • v.13 no.2
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    • pp.122-128
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    • 2004
  • In order to make a doubly-curved sheet metal effectively, a sheet metal forming process has been developed by adopting the flexibility of the incremental forming process and the principle of bending deformation which causes slight deformation in thickness. The developed process is an unconstrained forming process with no holder. For this study, the experimental equipment is set up with the roll set which consists of two pairs of support rolls and one center roll. In the experiments using aluminum sheets, it is found that the curvature of the formed sheet metal is determined by controlling the distance between supporting rolls in pairs and the forming depth of the center roll and it also depends on the thickness of the sheet metal. In order to check the effect of process parameters on the generation of sheet metal curvatures in this process, the orthogonal array is adopted. From the experimental results, among the process parameters, the distance between supporting rolls in pairs along the direction of one principal radius of curvature as well as the forming depth and the thickness of the material is shown to influence the generation of curvature in the same direction significantly. That is, the other distance between supporting rolls in pairs which are not located in the same direction of one principal radius of curvature, does not have an significant effect on the generation of the curvature in that direction. It mainly affects the generation of curvature in its own direction with the forming depth and the thickness of the material.