• Title/Summary/Keyword: Slitting

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A Study on the Burr Formation in Shearing with Al Alloy (Al 합금의 전단작업시 발생하는 버어에 관한 연구)

  • Ko, Dae-Lim;Jung, Dong-Won;Kim, Jim-Moo;Lee, Kyung-Sick
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.6 no.2
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    • pp.17-21
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    • 2007
  • Shearing including punching, blanking, trimming, slitting, etc is one of the most frequently used processes in sheet metal manufacturing. It has been widely used for manufacturing autobody, electronic components, aircraftbody, etc. In this paper, it has been researched by the experiment to examine the effect of burr height corresponding to die clearance, cutting angle, tool sharpness, etc. This paper presents the experimental results with using Al alloy sheet.

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Application of CAE Techinique for the Optimization of Press Forming Condition of Low Arm (로우암 프레스 성형 조건의 최적화를 위한 CAE 기술의 적용)

  • 김영석;이택근;김성태
    • Transactions of Materials Processing
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    • v.9 no.3
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    • pp.257-264
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    • 2000
  • In this study, optimization for press forming condition of low arm was performed with explicit dynamic FEM code, Pam-Stamp. FEM simulation was coupled with the Taguchi's experiment technique having three design variables - friction coefficient, plastic anisotropy parameter, and blank shape - which are chosen to be optimized. The simulation results were compared with those of experiment. We found out the change of blank shape among these three design variables is very effective in optimizing press forming condition of low arm. In addition, the modified blank shape shows high yield of slitting coil.

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An Automated Process Planning System for Blanking of Stator and Rotor Parts and Irregularly-Shaped Sheet Metal Products (스테이터와 로터 및 불규칙한 박판제품의 블랭킹에 관한 공정설계 시스템)

  • Park, J.C.;Kim, B.M.;Kim, J.H.
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.9
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    • pp.46-53
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    • 1996
  • This paper describes some research works of computer-aided design of blanking and piercing for stator and rotor parts and irregularly shaped sheet metal by press. An approach to the system is based on knowledge based rules. The process planning system by considering a blank layout for nesting of irregularly shaped sheet metal and an improved strip layout for stator and rotor parts and irregularly shaped sheet metal is implemented. Using this system, design parameters(utilization ratio, slitting width, pitch, working order, die blank shapes) are determined and output is generated in graphic forms. Knowledges for blank layout and strip layout are extracted from the plasticity theories, handbooks, relevant references and empirical know-hows of experts in blanking companies. The implemented system provides powerful capabilities for process planning of stator and rotor parts and irregularly shaped sheet metal.

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A Study on The Burr Formation in Shearing Steel for Automobile Parts (자동차용 강판의 전단작업시 버어에 관한 연구)

  • Kim J. M.;Ko D. L.;Ahn H. C.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2004.10a
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    • pp.19-22
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    • 2004
  • Shearing including punching, blanking, trimming, slitting, etc is one of the most frequently used processes in sheet metal manufacturing. It has been widely using for manufacturing autobody, electronic components, aircraftbody, etc. In this paper, it has been researched by the experimental investigation to examine the influence of shearing processes parameters such as clearance, cutting angle, material properties, etc. From the results of experiment, it has shown that it gives the small variations at burr height below the proper clearance and it also presents that it is no affected the variations of cutting angle.

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Design on Main Mechanism of High Throughput Device for Enhancement of Oxidation and Recover Rate (산화속도 및 회수율 향상을 위한 고효율 장치 핵심 메커니즘 설계)

  • Kim, Y.H.;Park, B.S.;Jung, J.H.;Yoon, J.S.;Hwang, J.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.05a
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    • pp.473-476
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    • 2008
  • In this paper, we designed the main mechanism of high throughput device for rod-cuts of spent fuel. For this, we analyzed the mechanical methods(slitting, ball mill, roller straightening) and chemical methods(muffle furnace, rotary kiln). As the results, methods of ball drop and rotary drum for concepts design were selected in the analysis step. For enhancement of oxidation rate, we devised the blades on the reactor with mesh type. Also, for enhancement of decladding rate, we designed ball size and rotation reactor with mesh type and devised the vacuum system for fission products. Mechanisms of oxidation and recovery can simultaneously handle the rod-cuts of spent fuel and independently recover. The results of mechanism design can be used for scale-up of high throughput device.

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A Development of High-Durability Copper Foil Materials for Clock Spring Cable Using Grain Size Control Techniques (결정립 제어 기술을 이용한 클락스프링 케이블용 고내구 동박 소재 개발)

  • Chae, Eul Yong;Lee, Ho Seung
    • Journal of Auto-vehicle Safety Association
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    • v.13 no.3
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    • pp.20-25
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    • 2021
  • Flexural resistance evaluation of FFC (Flexible Flat Cable) was performed according to the grain size of rolled copper foil by adding 0.1wt% silver (Ag) and electrodeposited copper foil by slitting method after heat-treatment. These methods are aimed at enhancing the flexural durability of the FFC by growing the grain size of copper foil. By increasing the grain size of the copper foil and minimizing the miss-orientation at grain boundaries, the residual stress at the grain boundaries of the copper foil is reduced and the durability of the FFC is improved. Maximizing an average grain size of copper foil can be got a good solution in order to enhance the durability of the FFC or FPCB (Flexible Printed Circuit Board).

Reliability Evaluation of ACP Component under a Radiation Environment (방사선환경에서 ACP 주요부품의 신뢰도 평가)

  • Lee, Hyo-Jik;Yoon, Kwang-Ho;Lim, Kwang-Mook;Park, Byung-Suk;Yoon, Ji-Sup
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.5 no.4
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    • pp.309-322
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    • 2007
  • This study deals with the irradiation effects on some selected components which are being used in an Advanced Spent Fuel Conditioning Process (ACP). Irradiation test components have a higher priority from the aspect of their reliability because their degradation or failure is able to critically affect the performance of an ACP equipment. Components that we chose for the irradiation tests were the AC servo motor, potentiometer, thermocouples, accelerometer and CCD camera. ACP facility has a number of AC servo motors to move the joints of a manipulator and to operate process equipment. Potentiometers are used for a measurement of several joint angles in a manipulator. Thermocouples are used for a temperature measurement in an electrolytic reduction reactor, a vol-oxidation reactor and a molten salt transfer line. An accelerometer is installed in a slitting machine to forecast an incipient failure during a slitting process. A small CCD camera is used for an in-situ vision monitoring between ACP campaigns. We made use of a gamma-irradiation facility with cobalt-60 source for an irradiation test on the above components because gamma rays from among various radioactive rays are the most significant for electric, electronic and robotic components. Irradiation tests were carried out for enough long time for total doses to be over expected threshold values. Other components except the CCD camera showed a very high radiation hardening characteristic. Characteristic changes at different total doses were investigated and threshold values to warrant at least their performance without a deterioration were evaluated as a result of the irradiation tests.

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Cryopreservation of Unfertilized Oocytes and Use as Recipient Oocyte for Nuclear Transplant in Rabbits (토끼에서 미수정난자의 동결보존과 핵이식을 위한 수핵난자로서의 이용에 관한 연구)

  • 김창근;김창근;황성수;정영호;손동수;이종완;이장희
    • Korean Journal of Animal Reproduction
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    • v.20 no.1
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    • pp.9-17
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    • 1996
  • This study was conducted to investigate freezability of in vitro and in vitro matured rabbit oocytes, possibility of NT using frozen-thawed unfertilized oocytes, and NT efficiency by zona-slit micromanipulation. After freezing of in vitro matured oocytes, 33 to 49% of oocytes appeared normal morphology and 1.0M DMSO and 1.5M glycerol showed slightly high survival rate, but there was no difference in survival between two cryoprotectants. Freezability of in vitro matured oocytes was low in 1.5M glycerol and more sensitive to freezing. Efficiency of enucleation and fusion rate in method B was higher than that in method A and no difference in this efficiency was between 3 groups of oocytes in method B. Cleavage rate and developmental capacity to M+B stage of fused embryos derived from frozen oocytes was greatly lower than that from fresh oocytes, respectively(39.1% : 79.5% ; 3.1% : 19.3%) and there was no difference in cleavage rate between DC voltages in two group oocytes. Additional incubation in cytochalasin B after electrical stimulation did not affect embryo development. In conclusion, it is suggested that enucleation and nucelar transfer by slitting of zona is more effective method in rabbit and that further study on optimum freezing conditions for in vitro matured oocytes is necessary to use as recipient oocytes.

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Slitting Test of Simulated Fuel Rod by Using a Newly Developed Decladding Device (실증용 탈피복 장치를 이용한 모의 핵연료 슬릿팅 시험)

  • Jung, J.H.;Hong, D.H.;Kim, Y.H.;Park, B.S.;Lee, J.K.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2006.05a
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    • pp.141-144
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    • 2006
  • In this study, we developed a decladding device which separates 250 mm length of simulated nuclear spent fuel rod into the pallets and the pieces of the hulls after inserting the rod cut into the module with several pairs of blades. To improve the performance of the equipment, we considered some mechanisms to prevent the rod cut from being exposed or bounced into the hot-cell, to reduce the operation time, and to insert the rods automatically. It is expected that the newly developed system will contribute to prevent radioactive pollution in the hot-cell, reduce the operation time, and to increase the safety of the operators. As a result of the performance test for some mockup fuel rod cuts in the ACP(Advanced Spent Fuel Control Process) facility, it was verified that the decladding device could be applied to the actual fuel rod cut. And it will be able to use for a scale-up facility in the future.

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A Study on the Burr Height in Shearing Steel Sheet for Automobile Parts (자동차용 강판의 전단작업시 발생하는 버어에 관한 연구)

  • Ko, D.L.;Jung, D.W.;Kim, J.M.;Lee, K.S.
    • Journal of Power System Engineering
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    • v.11 no.3
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    • pp.47-52
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    • 2007
  • Punching, blanking, trimming and slitting are widely used in shearing processes in sheet metal forming of automotive parts. In this paper the effects of clearance, cutting angle and tool sharpness on the formation of burr were investigated by experimental method in shearing processes of steel sheets, SPCEN and SPRC35E. The amount of burr and the shapes of burr were different between two kinds of steel sheets. It has been shown that the cutting angle of the shearing blade had no effects on the height of burr when the clearance was below the 10% of the steel sheet thickness, and also that the height and shape of burr were not affected by the cutting angle when the wear of shearing blade was below the 10% of the steel sheet thickness. It was known that there had been existing the critical clearance of 10 to 15% for the tested steel sheet, SPCEN and SPRC35E.

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