• 제목/요약/키워드: deep drawing process

검색결과 283건 처리시간 0.024초

다단 벽두께 원통 쉘 성형 공정 설계에 관한 연구 (A Study on the Forming Process Design of Cylindrical Multithickness Shell)

  • 신보성;최두선;김동진;김병민;한규택;신영우
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1996년도 추계학술대회 논문집
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    • pp.943-948
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    • 1996
  • In this paper. we will discuss in making large size cylindrical shells with multithickness wall sections such as straight, stepped, tapered sides. These shells are constructed of type 6061 O temper aluminum starting with a blanking size of 877 mm plate. Its diameter to length ratio of 1 to 2.78 and a 36.7% wall reduction is achieved by our continuous deep drawing process. This process required no in-process annealing. But after cold working, these shells is performed heat treatment to T6 condition. These shells are used for the making of seamless LPG pressure vessels after the spinning process. This process is composed of deep drawing, reverse redrawing, drawing-ironing and several ironing processes. In the verification of forming process design, we used DEFORM code.

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두께 분포를 갖는 드럼 형상 제품의 성형을 위한 Deep Drawing과 단조 공정의 조합 (Combination of Deep Drawing and Forging Process for Forming Drum Shape Product Having Thickness Variation)

  • 차달준;김승수;변원용;강상욱;김응주;박훈재
    • 소성∙가공
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    • 제14권5호
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    • pp.439-443
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    • 2005
  • Deep drawing and cold forging processes are combined to achieve near net shape forming of automotive part which has not only drum shape but also thickness variation. It is important to find out proper intermediate shape where two totally different forming methods should be joined seamlessly. In the course of development of the combined process, finite element analysis can be utilized effectively to decide optimal position for transferring from the sheet metal work to the bulk forming. Because machining process is eliminated, significant improvement in integrity, reliability, and durability of the part is expected. The developed process combination could be applied in real manufacturing process successfully.

타원형 디프 드로잉 공정에서 블랭크 형상의 영향에 관한 연구 (A Study on the Influence of Blank Shape in Elliptical Deep Drawing Process)

  • 박동환;배원락;박상봉;강성수
    • 소성∙가공
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    • 제9권5호
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    • pp.469-477
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    • 2000
  • Most of researches have been performed on the formability of axisymmetric shape, but it is insufficient that the study on Process variables of elliptical deep drawing Product. There are many Process variables exerted influence on the formability of products. Particularly, blank shape is more important than the others in elliptical deep drawing process. In this study, blanks of three types were proposed and compared using thickness distribution and movement of sheet during the process. The aim of a paper is to obtain optimal blank shape through experiment and finite element analysis(FEA).

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두께 분포를 갖는 드럼 형상 제품의 성형을 위한 deep drawing과 단조 공정의 조합 (Combination of deep drawing and forging process for forming drum-shaped-product to have thickness variation)

  • 차달준;김승수;변원용;강상욱;김응주;박훈재
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2004년도 추계학술대회논문집
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    • pp.342-345
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    • 2004
  • A combination of deep drawing and cold forging process is tried to achieve near net shaping of automatic transmission part which has drum shape and thickness variation. It is key for successful shaping of the part to find out proper condition to combine two different forming methods. Finite element analysis can be utilized for that purpose effectively. Integrity, reliability, and durability of the part are improved by eliminating machining process. The developed process is applied in real manufacturing process successfully.

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원형컵 드로잉의 공정설계 변화에 따른 제품품질에 미치는 영향 (Influence of Process Design Scheme on Product Qualities in Cylindrical Cup Drawing)

  • 이재명;이상민;최영윤;류호연;김종호
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2002년도 춘계학술대회 논문집
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    • pp.82-85
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    • 2002
  • A systematic investigation for process design in deep drawing is necessary for quality improvement of drawn cups. This study has been concentrated mainly on the influence of process design scheme on product qualities in cylindrical cup drawing. Three types of process design scheme were chosen in this study. That is, Case 1 is to finish drawing a cup of 50m in diameter in one stage, Case 2 and Case 3 are redrawing the drawn cups of 55, 65 mm in diameter to the final size respectively. Though experiments the maximum drawing force in two-stage cup drawing could be reduced up to 35% as compared with that of one-stage cup drawing. In addition, the Case 2 and Case 3 processes showed better product qualities than the Case 1 process when comparing distributions of thickness, hardness, dimensional accuracy.

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원통의 2단 인장드로잉 성형에 관한 연구 (A Study of Cup forming by double Stretch-Drawing Process)

  • 김영수;정태훈;일본명
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2003년도 추계학술대회
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    • pp.406-411
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    • 2003
  • It is clearly demonstrated that deeper cups could be formed by single and double stretch-drawings from smaller circular blanks due to such wall-thinning action than in the usual deep-drawing of larger blanks. From this fact, it is emphasized that the deep-drawability of a sheet metal Is not evaluated simply by the conventional L.D.R (limiting drawing ratio), but the depth of the drawn cup should also be taken into account. Many experimental data about various metals and thicknesses given in this paper offer a valuable information in this process for more general use which recommends to replace the conventional deep-drawing process by the stretch-drawing process both for single and double operations. In the single stretch-drawing, it is also confirmed that a deeper cup can be produced by raising the blank-holding force at later stage of operation.

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축대칭 다단계 딥드로잉 공정의 성형인자에 대한 연구 (A Study on the Formability Factors of Axisymmetric Multi-Stage Deep Drawing Processes)

  • 여은구;조선형;이용신
    • 한국공작기계학회논문집
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    • 제11권4호
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    • pp.6-11
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    • 2002
  • Formability in deep drawing process depends not only on a drawability of workpiece material but also on process conditions such as die punch comer radius, lubricant conditions, punch-die clearance etc. For instance, bending resistance should be reduced by increasing die round appropriately, drawing load should be minimized by improving the lubricant condition between die and material, and blanking load should be increased by selecting a pertinent punch round and by augmenting the friction resistance in punch. In this study, a multi-stage deep drawing process is analyzed using ABAQUS. The effects of formability factors, such as die shoulder radius, punch-die clearance and friction coefficient are investigated, and the results are also discussed in detail.

Application of Expert System for Non-Axisymmetric Deep Drawing Products

  • Park, Diong-Hwan;Kang, Sung-Soo
    • International Journal of Precision Engineering and Manufacturing
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    • 제2권1호
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    • pp.26-32
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    • 2001
  • An ecpert system for rotationally symmetric deep drawing products has been developed. The application for non-axisymmetric components, however, has not been reported yet. This study construsctus and expert system for non-axisymmetric motor frame which shape is classified into ellipse in deep draqing process and investigates process sequence design with elliptical shape. The developed system consists of four modules. The first is recognition of calculate surface area for non-axisymmetric products. The third is blank design module the creates an oval-shaped blank with the same surface area. The fourth is a processplanning module based on production rules that play the best important roles in an expert system for manufacturing .The production rules are generated and upgraded by interviewing field engineers. Especially, drawing coefficient, punch and die radii for elliptical shape products are considered as main design parameters. The constructed system for elliptical deep drawing product would be very useful to reduce lead time and improve accuracy for products.

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원통형 용기의 다단계 디프드로잉에 대한 다이 곡률반경 및 틈새의 영향 (Influence of Die Shoulder Radius and Punch to Die Clearance for Multistage Deep Drawing of Complex Cylindrical Shell)

  • 김두환
    • 소성∙가공
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    • 제8권3호
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    • pp.262-268
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    • 1999
  • This paper reviews the rules for optimizing die design and the process variables such as die shoulder radius and punch to die clearance, which are important factors in drawing the sheet metal without failures during deep drawing. To find the optimum conditions for improving deep drawability, a series of the experiments are performed, and the wall thinning and thickening variations are investigated in each process of deep drawing for a complex cylindrical shell. From the results of this proposed experiment, the optimum values of process variables are examined and discussed, and the usefulness of the present suggestion is shown.

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Cellular Phone 및 IMT-2000용 초정밀 사각 밧데리 케이스 성형공정 해석 (FE Analysis of The Forming Process of The High Precision Rectangular Battery Case used in Cellular Phone and IMT-2000)

  • 김홍주;구태완;강범수
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2000년도 추계학술대회논문집A
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    • pp.778-782
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    • 2000
  • Deep drawing and ironing are the major process used today in manufacturing of battery case used in cellular phone and IMT-2000 from aluminum. The same technology is utilized in manufacturing of steel or aluminum rectangular cans for components of medical instrument, portable PC, walkman and so on. Most of these processes require multi-stage ironing following the deep drawing and redrawing processes. The practical aspects of this technology are well known and gained through extensive experiment and production know-how. However, the fundamental aspects of theses processes are relatively less known. Thus, it is expected that process simulations using FEM techniques would provide additional detailed information that could be utilized to improve the process condition. This paper illustrates the application of process modeling to deep drawing and redrawing operations with the cellular phone and IMT-2000. A commercially avaliable finite element code LS-DYNA3D was used to simulate deep drawing and redrawing operations.

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