• 제목/요약/키워드: steel processing

검색결과 1,091건 처리시간 0.02초

CAE를 활용한 고강도강판(SPFH590)의 셰이빙 가공 시 클리어런스가 전단면 형상에 미치는 영향에 관한 연구 (A study on the effect of clearance on shear surfac shape during shaving processing of high strength steel plate (SPFH590) using CAE)

  • 성시명
    • Design & Manufacturing
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    • 제18권2호
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    • pp.23-28
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    • 2024
  • The automobile industry is a wide range of related industries, including parts manufacturing and vehicle assembly, press processing is an essential element in making automobiles. Press processing is a processing method for metal sheets that has relatively high dimensional and shape precision and is suitable for mass production. It refers to processing by attaching a special tool, a mold, to a press machine. Recently, the automobile industry is attempting to reduce the weight of automobiles in order to reduce carbon emissions due to global warming, and the use of high-strength steel sheets, which are lighter than general structural steel sheets, is a natural trend. Shear processing is required to use high-strength steel, and the shape of the shear surface created by shear processing has a significant impact on the quality of the automobile. Therefore, various methods are being attempted to improve the share surface during shear processing. Among them, shaving processing is a method of shearing the primary shearing area again, and it is difficult to obtain an accurate answer because complex deformation occurs in the microscopic shear area. Therefore, in this study, the effect of machining allowance on shaving processing was analyzed using the finite element method using high-strength steel plate (SPFH590), and the differences were compared and examined through actual experiments under the same conditions.

송전 강관 철탑 용접 열영향부의 인성 거동특성에 관한 연구 (Behavior of impact toughness in the HAZ of high strength steel tubes for power transmission steel tower)

  • 민경오;박종원;이창희
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 추계학술대회 논문집 학회본부 A
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    • pp.455-459
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    • 1999
  • 용접열영향부는 최고 도달온도로부터의 거리에 따른 온도구배 변화와 급격한 열 사이 클 때문에 조직 및 물성치의 변화가 예상되는 영역이므로 인성저하등 취성이 잠재적으로 내포된 지역임을 쉽게 예상할 수 있다. 따라서 송전 철탑용 STKT 590 용접열영향부에서의 상변태 거동과 미세조직의 변화에 따른 기계적 특성을 파악하여 용접부의 안전성 확보를 위해 용접열영향부(HAZ)의 상변태거동과 미시파괴기구를 연구하고 개선안을 도출할 필요가 있다.

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다축대각단조(MADF) Ver.1 및 Ver.2 공정으로 가공한 IF Steel의 미세조직 및 기계적 성질에 대한 연구 (A Study on Microstructure and Mechanical Properties of IF Steel Cube Fabricated by Multi-Axial Diagonal Forging Ver.1 and Ver.2 Processes)

  • 정도헌;조유연;권상철;김순태;이성;최시훈;정효태
    • 소성∙가공
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    • 제30권6호
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    • pp.306-310
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    • 2021
  • In this study, IF steel, which has a body-centered cubic (BCC) crystal structure, was fabricated as a 25 mm-long cube, and then processed for one cycle without intermediate heat treatment by applying MADF Ver.1 and Ver.2 processes. MADF processing was performed with graphite lubrication for each pass at room temperature. The development of the microstructure and texture was analyzed and compared by the location of the specimen using EBSD measurements of the IF steel. Vickers hardness test and miniature tensile test were also performed to analyze the mechanical properties. The coarse grain size of 742.6 ㎛ of the as-received IF steel was refined to a grain size of 53.0 ㎛ after one cycle of MADF Ver.1 processing and 27.0 ㎛ after MADF Ver.2 processing. Vicker's hardness of the as-received IF steel at 94 Hv was increased to 185.6 Hv and 191.2 Hv after one cycle of MADF Ver.1 and Ver.2 processing, respectively.

신선 가공된 열처리 생략강의 냉간 성형성에 대한 연구 (Study on the Cold Formability of Drawn Non-heat Treated Steels)

  • 박경수;박용규;이덕락;이종수
    • 소성∙가공
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    • 제12권4호
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    • pp.364-369
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    • 2003
  • Non-heat treated steels are attractive in the steel-wire industry since the spheroidization and quenching-tempering treatment are not involved during the processing. However, non-heat treated steels should satisfy high strength and good formability without performing heat treatment. Therefore, it is important to investigate optimum materials showing a good combination of strength and formability after the drawing process. In this study, three different steels such as dual phase steel, low-Si steel, and ultra low carbon bainitic steel were used to study their mechanical properties and the cold formability. The cold formability of three steels was investigated by estimating the deformation resistance and the forming limit. The deformation resistance was estimated by calculating the deformation energy, and the forming limit was evaluated by measuring the critical strain revealing crack initiation at the notch tip of the specimens. The results showed that deformation resistance was the lowest in the low-Si steel, and the forming limit strains of ultra low carbon bainitic steel and low-Si steel were higher than that of commercial SWRCH45F steel.

Factors Influencing Edge Dendritic Plating of Steel Sheet in the Electro-Galvanizing Line

  • Du-Hwan Jo;Moonjae Kwon;Doojin Paik;Myungsoo Kim
    • Corrosion Science and Technology
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    • 제23권3호
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    • pp.215-220
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    • 2024
  • Recently, the demand for Zn-Ni electrogalvanized steel sheets for home appliances and automobiles is increasing. Products should have a thick plating (30 to 40 g/m2) on both side with a thin thickness (≤ 0.8 mm) and the highest surface quality. By a high current density operation, current is concentrated in the edge part of the steel sheet, resulting in large surface dent defects due to dendritic plating. This can lead to a low productivity due to low line speed operation. To solve this problem, this study aimed to identify factors influencing dendritic plating. A cylindrical electroplating device was manufactured. Effects of cut edge shape and thickness of steel plate, current density, temperature, flow rate, electrolyte concentration, and pH on dendrite generation of Zn-Ni electroplating were examined. To investigate effect of edge shape of the steel sheet, the steel sheet was manufactured using three processing methods: shearing, polishing after shearing, and laser. Relative effects thickness and cut edge processing methods of the steel plate, current density, temperature, flow rate, electrolyte concentration, and pH of plating solution on dendrite plating were investigated. To prevent dendrite plating, an edge mask was manufactured and its application effect was investigated.