• Title/Summary/Keyword: Automobile body

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The spring back of Automobile body panel (자동차 Panel의 Spring back에 대한 연구)

  • CHOI Y. H.;YOO C. K.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2002.02a
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    • pp.148-153
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    • 2002
  • Spring back is the typical deformation of pressing process. This phenomenon much affects productivity and especially Incurs the unexpected result of assembling process. We have been searching for the various of the spring back to minimize spring back effect, because it is inevitable.

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Development of Automotive Position Measuring Vision System

  • Lee, Chan-Ho;Oh, Jong-Kyu;Hur, Jong-Sung;Han, Chul-Hi;Kim, Young-Su;Lee, Kyu-Ho;Hur, Jin
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.1511-1515
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    • 2004
  • Machine vision system plays an important role in factory automation. Its many applications are found in automobile manufacturing industries, as an eye for robotic automation system. In this paper, an automobile position measuring vision system(APMVS) applicable to manufacturing line for under body painting of a car is introduced. The APMVS measures position and orientation of the car body to be sealed or painted by the robots. The configuration of the overall robotic sealing/painting system, design and application procedure, and application examples are described.

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The Automotive Door Design with the ULSAB Concept Using Structural Optimization (구조 최적 설계기법을 이용한 ULSAB 개념의 자동차 도어 설계)

  • 신정규;송세일;이권희;박경진
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2000.04b
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    • pp.187-194
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    • 2000
  • Weight reduction for an automobile body is being sought for the fuel efficiency and the energy conservation. One way of the efforts is adopting Ultra Light Steel Auto Body (ULSAB) concept. The ULSAB concept can be used for the light weight of an automobile door with the tailor welded blank (TWB). A design process is defined for the TWB. The inner panel of door is designed by the TWB and optimization. The design starts from an existing component. At first, the hinge and inner reinforcements are removed. In the conceptual design stage, topology optimization is conducted to find the distribution of variable thicknesses. The number of parts and the welding lines are determined from the topology design. In the detailed design process, size optimization is carried out to find thickness while stiffness constraints are satisfied. The final parting lines are determined by shape optimization.

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Understanding Automobile Roll Dynamics and Lateral Load Transfer Through Bond Graphs

  • ;Deam Karnopp
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.3
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    • pp.34-44
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    • 1998
  • It is clear that when an automobile negotiates a curve the lateral acceleration causes an increase in tire normal load for the wheels on the outside of the curve and a decrease in load for the inside wheels. However, just how the details of the suspension linkages and the parameters of the springs and shock absorbers affect the dynamics of the load transfer os not easily understood. One even encounters the false idea that since it is the compression and extension of the main suspension springs spring body role which largely determines the changes in normal load, of roll could be reduced, the load transfer would also be reduced. Using free body diagrams, one can explain quite clearly how the load is transferred for steady state cornering, and, using complex multibody models of particular vehicles one can simulate in good fidelity how load transfer occurs dynamically. Here we adopt a middle ground by using the concept of roll center and using a series of half-car bond graph models to point out main effects. Since bond graph junction structures automatically and consistently constrain geometric and force variables simultaneously, they can be used to point out hidden assumptions of other simplified vehicle models.

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A Study on the Improvement of Formability of Automobile Body Sheet (자동차용 강판의 성형성 개선에 관한 연구)

  • 김순경
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1997.10a
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    • pp.101-107
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    • 1997
  • Development on the mechanical properties of steel sheet for the automobile body panel is very important in the BAF(Batch annealing furnace) annealing process. Because of the heat treatment method in the BAF, mechanical properties was decided on the heat treatment method of the coil. So, we tested on the development of mechanical properties according to heat treatment method at the annealing furnace using the Ax atmospheric gas and the HNx atmospheric gas. As a result of several investigations. We confirmed the following characteristics ; mechanical properties was changed under the influence of the annealing cycle, the heat treatment method and the atmospheric gas. And, elongation in the HNx BAF was better than the Ax BAF. Finally, most important thing in the BAF is using proper annealing cycle in order to get a good quality.

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A Study on the Formability of Autonobile Panel on the Heat Treatment Method (자동차용 강판의 소둔방법에 따른 성형성의 변화에 관한 연구)

  • 김순경;이승수;전언찬
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.629-632
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    • 1995
  • The formability of an automobile body panel is very important. So, we performed an annealing condition change for the development of annealing condition with temperature, atmospheric gas and the annealing cycle. Formability was changed under the influenced of the mechanical properties of steel sheet for the automobile body panel. Therefore, ot os important in the BAF(Batch annealing furnace) annealing process. Because mechanical properties were decided on the heat treatment method of the coil. So, we tested the development of mechanical properties according to the heat treatment method at the annealing furnace using the Ax atmospheric gas and the HNx atmospheric gas. As a result of several investigations, we confirmed the following characteristics ; mechanical properties change under the influence of the annealing cycle and atmospheric gas.

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The Characteristic of Fatigue Crack Propagation of Laser Welded Sheet Metal for Automobile Body Panel (자동차 차체제작용 레이저 용접 판재의 피로균열 전파 특성)

  • 곽대순;권윤기;오택열;이경엽;강연식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.3
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    • pp.181-189
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    • 2001
  • For the Tailor Welded Blank sheet used fur automobile body panel, the characteristics of fatigue crack propagation behavior were studied. The thickness of specimen was machined to be same (0.9+0.9mm) and different (0.9+2.0mm). As a base test, mechanical properties around welding zone were examined. The results indicated that there were no significant decreases in mechanical properties, but hardness around welding bead is 2.3 times greater than base material. The crack propagation rate was noticeably decreased around welding line and rapidly increased as it passed by welding line. Reviewing the shape of the crack propagation, crack width around welding line was wide around the welding zone due to retardation of crack growth, but it became narrow passing welding line due to decreased toughness. Elasto-Plastic analysis was performed by finite element analysis fur explaining the test results.

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The Improvement of Formability using the Polar-coordinate FLD with Strain Path Independence (경로의존성 없는 극좌표계 성형한계도를 이용한 판재 성형성 향상 기술)

  • Bae, M.K.;Hong, S.H.;Choi, K.Y.;Yoon, J.W.;Kim, Y.S.
    • Transactions of Materials Processing
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    • v.24 no.5
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    • pp.348-353
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    • 2015
  • The PEPS(Polar-coordinated Effective Plastic Strain) FLD(Forming Limit Diagram), a new type of FLD based on a polar representation of the EPS(Effective Plastic Strain), appears to be an effective solution to the problem of non-linear strain path effects. This method has the advantages of the familiar strain-based diagram for linear loading, but without the strain-hardening limitations of the stress-based diagram, or non-intuitive aspects of alternate Cartesian diagrams based on effective plastic strain. In the current study, the PEPS FLD was applied to the development process of an aluminum automobile-body panel, including the necking or crack prediction, die design, and die modification. As a result, the PEPS FLD provided improved formability of aluminum sheet as compared to deriving the potential formability with non-linearity.

Analysis of Dynamic Characteristics Change of Middle-Sized Bus by Attachment of Trim Components (트림 부품의 부착에 따른 중형 버스의 동특성 변화 분석)

  • 이상범;임홍재
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.1
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    • pp.88-93
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    • 2004
  • In general, a fundamental structural design consideration for an automobile is the overall dynamic behavior in bending and torsion. Dynamic behavior of the automobile are mainly influenced by the structural stiffness of B.I.W.(body-in-white) and the physical property of trim components. In this paper, the modeling techniques for various trim components of middle-sized bus are presented, and the dynamic effects of the trim components on the vibration characteristics of the bus are investigated. The $1^{st}$ torsional frequency is decreased by attaching windshield and backlite to the B.I.W., but the $1^{st}$ vertical bending frequency and the $1^{st}$ lateral bending frequency are increased. The natural frequencies of the bus are decreased by attaching doors and windows. And also, the natural frequencies of the bus are large decreased by attaching seats, instrument panel etc. The study shows that the dynamic characteristics of the bus can be effectively predicted in the initial design stage.

A Study on the Improvement of Formability of Automobile Body Sheet (자동차용 강판의 성형성 개선에 관한 연구)

  • 김순경
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.7 no.2
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    • pp.108-114
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    • 1998
  • Development on the mechanical properties of steel sheet for the automobile body panel is very important in the BAF(Batch annealing furnace) annealing process. Because of the heat treatment method in the BAF, mechanical properties was decided on the heat treatment method of the coil. So, we tested on the development of mechanical properties according to heat treatment method at the annealing furnace using the Ax(H$_2$75%, $N_2$25%) atmospheric gas and the HNx(H$_2$4%, $N_2$96%) atmospheric gas. As a result of several investigations. We confirmed the following characteristics ; mechanical properties was changed under the influence of the annealing cycle, the heat treatment method and the atmospheric gas. And, elongation in the HNx BAF was better than the Ax BAF. Finally, most important thing in the BAF is using of proper annealing cycle in order to get a good quality.

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