• Title/Summary/Keyword: Forming Machine

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Development of a New NC-Controlled Trial Manufacturing Process for Sheet Metal Forming (박판 형성을 위한 새로운 추치 제어식 시작 방법의 개발)

  • 조철훈;양동열
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.929-932
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    • 1995
  • In the work, a new computerized incremental forming method having high flexibility has been developed. In the mothod, the ordinary tools are replaced by various small tools, and only the small local region of a sheet blank is incrementally by movement of these tools. Since a small tool moves over the arbitrary surface ofthe dies using a NC machine, it is possible to produce three-dimensional and non-symmetric parts directly from CAD data. Arbitrarily shaped dies are made by LOM(Laminated Object Manufacturing), which is one of the Rapid Prototyping Methods. A forming machine is designed and developed by introducing a computer to control the movement of the tools.

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Development of A Web-based Simulation System for Axi-Symmetric Deep Drawing (축대칭 디프드로잉 공정의 웹 기반 해석시스템 개발)

  • 정완진
    • Transactions of Materials Processing
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    • v.12 no.6
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    • pp.550-557
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    • 2003
  • In this study, a web-based system was developed by utilizing finite element method and virtual system designed using Virtual Reality Modeling Language (VRML). The simulation program for axi-symetric sheet forming is developed using finite flement method. The developed system consists of two modules, client module and server module. The client module was developed by using Active-X control. The input data for FEM calculation is transferred to the server module by using communication protocol. Then sever module performs several successive processes: input data generation, forming simulation, conversion of results to VRML format. After that, the results from the simulation can be visualized on the web browser in client computer. Besides, client module offers the capability to control and navigate on virtual forming machine and calculated result. By using this system simulation result can be investigated more realistically in virtual environment including forming machine.

A Study on the Optimal Design of the Brake Tube-End for Automobiles (승용차용 브레이크 Tube-End의 최적설계에 관한 연구)

  • 한규택;박정식
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.10a
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    • pp.53-57
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    • 2002
  • Brake tube is considered one of the most important parts in automobile. The shape of brake tube-end has a great influence on the function of brake, and the quality and productivity of brake tube have relation to die design. The forming process of brake tube-end is peformed by hydraulic press forming machine. In this paper, the forming processes of tube-end for automobile is analyzed and designed to make the optimal form of brake tube-end. Also, finite element analysis has been carried out using DEFORM-3D$\^$TM/ to predict the optimal shape of brake tube-end and the results obtained showed the optimal length between punch and chuck is 1.0 ∼ 1.2mm. The shape of tube-end is in good agreement with the finite element simulations and the experimental results.

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Mechanical Bending Process and Application for a Large Curved Shell Plate by Multiple Point Press Machine (무금형 다점 펀치를 사용한 선체외판의 분할 성형 가공 정보 계산 시스템 개발)

  • Hwang, Se-Yun;Lee, Jang-Hyun;Ryu, Cheol-Ho;Han, Myung-Soo;Kim, Kwang-Ho;Kim, Kwang-Sik
    • Journal of the Society of Naval Architects of Korea
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    • v.48 no.6
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    • pp.528-538
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    • 2011
  • As a forming method for curved hull plates more efficient than the flame bending, mechanical bending using multi point press forming and die-less forming is discussed in this paper. the mechanical forming is a flexible manufacturing system for automatically forming of hull parts. It is especially suited to varied curved parts. This paper discusses a multiple point pressing machine composed of a pair of reconfigurable punches in order to achieve the rapid forming of curved hull plates using division forming and presents how forming information is obtained from the given design surface. Although the mechanical forming can be efficient in the metal forming, spring back after pressing is a phenomenon which must be carefully considered when quantifying the process variables. If the spring back is not accurately controlled, the fabricated shell plate cannot meet assembly tolerance. This paper describes the principles to calculate the proper stroke of each punch at the divided areas. the strokes are determined by an iterative process of sequential pressing and spring back compensation from an unfolded flat shape to its given design surface. FEA(finite element analysis) is used to simulate the spring back of the plate and the IDA(iterative displacement adjustment) method adjusts the offset of pressing punches from the deformation results and the design surface. The shape deviations of two surfaces due to spring back are compensated by integrated system using FEA and IDA method. For the practical application, It is aimed to develop an integrated system that can automatically perform the compensation process and calculate strokes of punches of the double sides' reconfigurable multiple-press machine and some experimental results obtained with mechanical bending are presented.

Application of Reverse Engineering System for Improvement of Press Forming Process (프레스 성형 공정 개선을 위한 역설계 시스템의 적용)

  • 김수용;김민주;이승수;전언찬;김순경
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2003.10a
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    • pp.412-419
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    • 2003
  • The most product is manufactured by mould in usual life. From drawing to manufacturing is to be automatically. But inspection is handwork usually. An alternative idea of this problem is reverse engineering. In this study, press forming is measured by 3D non-contact coordinate measuring machine and problem will be analyzed by comparing with 3D data Through the study, it will achieve improvement of press mould process.

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Development of Micro Metal Forming Manufacturing System (초미세 마이크로 소성성형 가공시스템 기술 개발)

  • Lee Nak-Kyu;Choi Tae-Hoon;Lee Hye-Jin;Chi Seog-Ou;Park Hoon-Jae;La Won-Ki
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2005.05a
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    • pp.383-388
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    • 2005
  • In this paper Research development about a micro metal forming manufacturing system has been developed. A micro forming system has been achieved in Japan and it's developed micro press is limited to single forming process. To coincide with the purpose to be more practical, research and development is necessary about the press which the multi forming process is possible. We set the development of the equipment including micro deep drawing, micro punching and micro restriking process to the goal. To achieve this goal, Research about micro forming process to be related to multi process forming must be preceded first. Material selection and analysis about micro forming process are accomplished in this paper. And the basis research to make actual system is accomplished.

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Orientation properties of Korean traditional paper-Hanji (전통한지의 종이 방향성)

  • Yoon, Seung-Lak;Ra, Jong-Bum
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.45 no.3
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    • pp.52-58
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    • 2013
  • To evaluate the anisotropic characteristics of Korean traditional paper-Hanji, the physical and mechanical characteristics of hand-made hanji, and machine-made hanji were investigated in this research. The densities of copying paper and newsprint paper appeared to be two times higher than the densities of hand-made hanji using Ssangbal sheet forming and hanji made of paper mulberry fiber. The breaking length, and tear index of both Hanji using Owangbal sheet forming, and hand-made Hanji using Ssangbal sheet forming appeared to be different according to the directions in paper. The breaking lengths of Hanji using Owangbal sheet forming showed little differences according to the directions. Breaking length of Hanji using Ssangbal sheet were slightly higher than those of Hanji using Owangbla sheet forming. The breaking lengths of machine-made hanji, copying paper, and newsprint paper were two to four times higher than those of hand-made Hanji. The breaking length showed higher differences according to the direction than the tear index. The tensile strength according to the directions in paper showed significant differences (${\alpha}$=0.05) in all papers used in this research.

Study of Factor Causing Wear of a Barrel Cam in a Paper-Cup-Forming Machine by Using Multibody Dynamics Model (다물체 동역학 모델을 이용한 종이컵 성형기용 배럴캠의 마모 인자에 관한 연구)

  • Jun, Kab-Jin;Park, Tae-Won;Cheong, Kwang-Yeil;Kim, Young-Guk
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.3
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    • pp.361-367
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    • 2010
  • The barrel cam, which is a type of cylindrical cam, has been widely used as a part of index drive units for automatic manufacturing machines. The axis of rotation of the barrel cam is orthogonal to the axis of rotation of the follower. The index drive rotates or dwells depending on the cam profile, while the cam rotates with a constant velocity. Continuous sliding contact between the barrel cam and the follower surfaces causes wearing of the adhesive between them. This study shows that the contact force between two sliding bodies is responsible for the wear of the barrel cam in the paper-cup-forming machine. This contact force is calculated by using the multibody dynamics model of the paper-cup-forming machine. The analytical result is validated by comparing it to the actual wear spots on the real product.

A Study on Development of Automotive Panel of Bumper Reinforcement with High Strength Steel Using Roll Forming Process (롤포밍 공정을 이용한 고장력강 재질의 범퍼보강 차체판넬 개발에 관한 연구)

  • Jung, Dong-Won;Kim, Dong-Hong;Kim, Bong-Chun
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.8
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    • pp.840-844
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    • 2012
  • Roll forming process is a sheet metal forming process where the forming occurs with rolls in several steps, often from an undeformed sheet to a product ready to use. And each pair of forming rolls installed in a forming machine operates a particular role in making up the required final cross-section. This process used to many industry manufactures and recently apply to automotive industry. This study, FEM simulation applied bumper reinforcement using SHAPE-RF software and analyzed about total effective strain, longitudinal strain, thickness according to the roll-pass.