• Title/Summary/Keyword: 금형수명

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A Study on the Prediction of Fatigue Life in the Axi-symmetric Extrusion Die (축대칭 압출금형의 피로수명예측에 관한 연구)

  • Ahn, S.H.;Kim, T.H.;Park, J.C.
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.8
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    • pp.80-87
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    • 1996
  • The present paper will give some results of the fatigue behavior of typical axi-symmetric forward extrusion die. The extrusion process is analyzed by rigid-plastic FEM and the deformation analysis of extrusion die is conducted by elasto-plastic FEM. To approach the crack problem LEFM (Linear Elastic Fracture Mechanics) is introduced. Using special element in order to conside the sigularity of stress/ strain in the vicinity of the crack tip, stress intensity factor and the effective stress intensity factor is calculated. Applying proper fatigue crack propagation criterion such as Paris/Erdogan fatigue law and maximum principal criterion to these data, then, the angle and the direction of fatigue crack propagation is simulated. In result, it is proved that the simulated fatigue crack propagates in the zigzag path along the radial direction and fatigue life of the extrusion die is evaluated by using the computed crack growth rate.

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엔드밀 형상에 따른 절삭가공 분석과 DB 구축 및 형상설계 S/W 개발에 관한 연구

  • 한창규;고성림
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.05a
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    • pp.267-267
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    • 2004
  • 엔드밀은 산업현장에서 정밀 금형과 다이 제조 시 넓게 사용되는 절삭 공구이며 공작기계의 향상에 따라 많은 발전을 거듭해 왔다 공작기계의 고속화에 따라 공작기계의 측면에서는 강성 증가, 열변형의 억제와 동적 안정성의 개선 및 응답성 개선을 통하여 정밀도를 향상시키고 이송속도와 절삭속도의 증가를 통해 생산성을 증대시키고 있으며 공구의 측면에서는 새로운 재종 및 코팅기법의 개발을 통해 공구수명의 향상을 달성하고 있다. 또한 공구형상의 최적화를 통해 동적 안정성을 확보하고 가공 정밀도를 개선하고자 하는 다양한 시도가 이루어지고 있다.(중략)

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Tool life increase for Hot forging with Finit Element Method (FEM을 이용한 열간금형 수명 향상)

  • 강종훈;이희방;김주현
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1999.06b
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    • pp.141-146
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    • 1999
  • In the stage of process design, many factors affecting tool life should be considered. Wear, Damage Accumulation and excessive die Stress are those. Most Engineer think wear and damage accumulation affection deeply to the cold forging dies and wear for the hot forging dies. In this report, the example that wear and stress distribution affect tool life in hot forging together will be introduced and the way to solve that problem using Finite Element Method.

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용접형 힌지 밸트플레이트 이송장치의 설계 및 개발

  • 전재억;황영모;김수광;박후명;권광진;하만경
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.05a
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    • pp.107-107
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    • 2004
  • 현재 자동차관련 산업 및 기계 산업에 이용되고 있는 기존의 Forming type의 컨베이어 시스템은 인장력에 의해 hinge belt plate가 늘어지는 현상이 발생하고 이 현상에 의하여 소음 기계의 마모 등의 고장의 원인이 되어왔다. 이에 이러한 현상을 줄이기 위해 H/B의 소재 두께를 높이므로 강성은 증가하는 반면에, 단위중량이 무거워지는 단점이 있으며, 또한 제품을 성형하는 금형의 강도와 수명 및 크기가 한정되어 있어 수요자의 다양한 요구에 부응하기 어렵다.(중략)

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Effect of Die Machining Method on the Surface of Die Steel STD11 (금형가공방법이 합금공구강 표면에 미치는 영향)

  • Kim Sei-Hwan;Chio Kye-Kwang
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.6 no.5
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    • pp.391-395
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    • 2005
  • This paper has comparatively analyzed the characteristics of the machined surface of a specimen made by machining Die Steel STD11 and a specimen obtained by W-EDM steel. If a press die is manufactured through W-EDM, products of shapes that cannot easily be made through machining can be manufactured easily. However, the life of the press die is significantly reduced compared with the press die made through machining. This is believed to be caused by the deformed layer that has occurred on the surface of the press die that was made through W-EDM. The roughness of the 2 specimens was measured, and it was learned that the distribution of the roughness of the specimen made through the 1st W-EDM was rough. When the specimens were observed using a scanning-electron microscope, there was significant difference between the surface and the cross-section of the 2 specimens, while the cross section of the specimen obtained through W-EDM had the tempered and quenched surface structure which exists in the form of a deformed layer.

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A Study on Life Estimation of a Precision Forging Die (정밀단조 금형의 수명 평가에 관한 연구)

  • Choi C.H.;Lee S.H.;Jung K.B.;Kim Y.J.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.1587-1590
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    • 2005
  • A rigid-plastic finite element analysis for the die forging process of a socket ball joint, which is used in the transportation system, was carried out. And also with the results, the elastic stress analysis for the forging die was performed in order to get basic data for the die life prediction. The die fatigue life prediction was simulated using Goodman's and Gerber's equation. The prediction technique for the fatigue life of a forged product, the socket ball joint, using DEFORM-3D is presented and the results are commented upon. Archard's wear model was used for the wear simulation and then the wear simulation and then the wear quantity was quantity was evaluated using volume. In order to prove the wear simulation results to be reliable, wear quantity of the real forging die set in used a forging factory was measured using a 3-dimensional measurement apparatus. The simulation results were relatively in good agreement with the experimental measurements.

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The study on Accelerated Life-Time Reliability Test Methods of Ni-Mn-B ternary alloy Plating(electrodeposit) (Ni-Mn-B 삼원합금도금 가속수명 및 신뢰성 평가에 대한 연구)

  • Ma, Seung-hwan;Noh, young-tai;Jang, gun-ik
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.5
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    • pp.2993-2999
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    • 2015
  • Steel companies are applying Ni-B or Ni-Co alloy plating to protect the surface of Continuous casting mold, and they are using saccharin polish which causes crack on plating layer due to sulfur in saccharin. It is considered that the Ni-S compound causes the cracking and additional tensile stresses. The Ni-Mn-B ternary alloy plating was developed for suppression of crack by forming Mn-S compound before Ni-S compound is formed, but there were no domestic or international standard on the Ni-Mn-B alloy plating. Therefore, reliability evaluation standard was established to evaluate the newly developed Ni-Mn-B plating. To develop accelerating life testing method, FMEA(Failure Mode & Effective analysis) was used to analyze the cause of the main failure in plating. The Ni-Mn-B reliability standard included accelerating life test method, and it was categorized by the fundamental performance test, environment test, and accelerated life test, and was designed to guarantee 1 000 hours of B10 life with 80 % reliable level.

A Study on Development of Small Motor Core Die for High Efficiency Induction Motor (고효율 유도전동기 소형 모터코어 금형개발에 관한 연구)

  • Lim, Sae-Jong;Kim, Sei-Hwan;Choi, Kye-Kwang
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.2
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    • pp.455-460
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    • 2010
  • The high-efficiency induction motor reduces the generation loss of conventional induction motors and saves energy with less electricity consumed, enabling the return of initial facilities investments on a shorter-term basis due to its low operation cost and allowing the extension of the life of the motor. Poscore has entered the phase of development of high-efficiency induction motor based on its experiences to date in cooperation with electricity researchers. This paper examines the development of the small motor die for the high-efficiency induction motor.

A Study on the Elimination of Surface Defect and Increase in Tool Life of the Warm Forged Spider (온간 스파이더 표면결함 개선과 금형수명 향상에 관한 연구)

  • Kang, Jong-Hun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.5
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    • pp.82-90
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    • 2020
  • Due to the complicated shape of the spider, the production method was changed from cold to warm forging. Finite element analysis was performed to predict the forging load and shape using the enclosed hydraulic die set. As the forging load increases due to the spider die volume, die stress analyses were performed to optimize the die design in order to reduce the die stress in various conditions. Large deformation while producing the complicated forging parts induces high forging load, which is one of the main parameters of the forging surface defects. The forging process was analyzed to find out the root cause of the surface defects generated during the spider production for various parameters, thereby revealing that the radius of die in the defect zone influenced the air trap depth, being the root cause of the surface defect. It was verified that die life was increased and the surface defect was eliminated by changing the die design during the mass production test.

Comparison of punch life of powder high speed tool steel and high speed tool steel (분말고속도공구강과 고속도공구강의 펀치 수명 비교)

  • Lee, Woo-Ram;Lee, Chun-Kyu
    • Design & Manufacturing
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    • v.16 no.1
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    • pp.9-14
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    • 2022
  • A lot of research is being done on metal materials to improve the lifespan of molded parts. As a result, excellent mold materials have been developed that withstand high hardness at high temperatures and frictional heat generated from high-speed cutting. In this study, the press mold life of powder high-speed tool steel and general high-speed tool steel was compared. Powdered high-speed steel is composed of alloying elements such as tungsten, maldividene, cobalt, chromium, and vanadium in steel, which improves wear resistance compared to high-hardness and high-speed tool steels. The mold parts of both steel types were manufactured in the same way from heat treatment to machining, and the powder high-speed tool steel was 66HRC and the high-speed tool steel was 61HRC. As a result of the experiment, it was observed that the number of punching of powder high-speed tool steel was improved by 40-50%, and powder high-speed tool steel had fewer impurities, uniform texture, and excellent surface structure. It has a microscopic structure.