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돌기 튜브 성형을 위한 회전 금형 인발공정에 관한 연구
박준홍(Joon-Hong Park),변상민(Sang-Min Byon) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.4
A rotational drawing die which can form a long tube with spiral grooves on the surface is presented. The main feature of the proposed die is a rotation insert that is embedded into the die container for the die to freely rotate with respect to the drawing centerline as the materials are drawn. We employed a three-dimensional finite element model to investigate the effects of the rotational die on the material filling of spiral grooves. The material used in the finite element analysis was stainless 304. We also performed a pilot drawing test to verify the usefulness of the proposed rotational drawing die. Results reveal that the material filling of spiral grooves by the proposed rotational drawing die was in good agreement for both the finite element analysis and the drawing test. We found that the underfill in a conventional drawing die was reduced in the proposed rotational drawing die.
Die design system for deep drawing and ironing of high pressure gas cylinder
Ji-Hun Yoon,Young-Choi,Yoon-So Park 한국정밀공학회 2005 International Journal of Precision Engineering and Vol.6 No.4
This paper describes a research work on the die design for the deep drawing & ironing(D. D. I.) of high pressure gas cylinder. D. D. I die set is large-sized die used in horizontal press, which is usually composed of a drawing, and an ironing die. Design method of D. D. I. die set is very different from that of conventional cold forging die set. Outer diameter of the die set is fixed because of press specification and that of the insert should be as small as possible for saving material cost. In this study, D. D. I die set has been designed to consider those characteristics, and the feasibility of the designed die has been verified by FE-analysis. In addition, the automated system of die design has been developed in AutoCAD R14 by formulating the applied methods to the regular rules.
Die design system for deep drawing and ironing of high pressure gas cylinder
Yoon Ji-Hun,Choi Young,Park Yoon-So Korean Society for Precision Engineering 2005 International Journal of Precision Engineering and Vol.6 No.4
This paper describes a research work on the die design for the deep drawing & ironing(D. D. I) of high pressure gas cylinder. D. D. I die set is large-sized die used in horizontal press, which is usually composed of a drawing, and an ironing die. Design method of D. D. I die set is very different from that of conventional cold forging die set. Outer diameter of the die set is fixed because of press specification and that of the insert should be as small as possible for saving material cost. In this study, D. D. I die set has been designed to consider those characteristics, and the feasibility of the designed die has been verified by FE-analysis. In addition, the automated system of die design has been developed in AutoCAD R14 by formulating the applied methods to the regular rules.
3-D Lay-Out을 이용한 본네트 드로잉 금형 설계 지원 시스템
정효상,이성수 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
Die design of bonnet drawing is composed of upper die, lower die and blank holder. It has been performed by checked and re-design method, which cause economic and financial loss. Nowadays, CAD/CAM system is excellent, but Application is low. Therefore, in specific item, drawing die of bonnet outer draw by 3-D Lay-Out. In this study purpose, Bonnet drawing die is designed rapidly, correctly. It's method that shape modify to resemble. This purpose lead to 3-D Lay-Out. It is to react the standard die. In rule relation, input data change all of the shape
권혁홍,이정로 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.4
Copper bus-bar is made by drawing process and used in many part of industry. When design drawing die for copper bus-bar, design factor is focused on the deformation of die-land by drawing force and shrink fit. In this paper it is analyzed to determine shrink fit value by shrink fit analysis program which is used with APDL/UIDL language in a commercial FEM package, ANSYS. The shrink fit analysis has been developed that enables optimal design of the dies taking into account the elastic deflections. Elastic deflection is generated in shrink fitting the die inserts and that caused by the stresses generated using DEFORM software for drawing process analysis. This data can be processed as load input data for a finite element die-stress analysis. Process simulation and stress analysis are thus combined during the drawing die design. The stress analysis of the dies is used to determine optimized dimension of die-land.
박성철,천임정,박현,홍성규,이경훈 한국마린엔지니어링학회 2020 한국마린엔지니어링학회지 Vol.44 No.5
In the multi-pass shape drawing process used for metal forming, the drawing force is typically applied unevenly to the material, thus causing errors in the dimensions of the material. In addition, the process is time consuming and costly. To overcome these problems, the roll die drawing process replaces the fixed drawing dies with non-driven roll dies that can undergo rotational movements to reduce friction forces at the die-material contact point. In this study, we propose a free-surface profile prediction model using the response surface method for the roll gap of a multi-pass drawing process using a roll die to fabricate square drawing material. We first derived geometrical parameters to apply to the response surface method. Then, using four process parameters that influence the deformation behavior of the material, a Box-Behnken design for response surface analysis was proposed, and a secondorder regression model was derived through finite element analyses. In addition, finite element analysis was performed to validate the free-surface profile prediction model. Our verification results confirmed that the free-surface profiles predicted by the theoretical model agreed with those obtained via finite element analysis. Hence, our proposed free-surface profile prediction model based on response surface analysis can be used to design rectangular-shaped roll die drawing processes.
Design of intermediate die shape of multistage profile drawing for linear motion guide
이상곤,이재은,김성민,김병민 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.12
The design of an intermediate die shape is very important in multistage profile drawing. In this study, two design methods for the intermediate die shape of a multistage profile drawing for producing a linear motion guide (LM) guide is proposed. One is the electric field analysis method using the equipotential lines generated by electric field analysis, and the other is the virtual die method using a virtual drawing die constructed from the initial material and the final product shape. In order to design the intermediate die shapes of a multistage profile drawing for producing LM guide, the proposed design methods are applied, and then FE analysis and profile drawing experiment are performed. As a result, based on the measurement of dimensional accuracy, it can be known that the intermediate die shape can be designed effectively.
프레스-금형 일체 구조해석에 의한 차체용 블랭크 홀더의 번형 최적화
이현수(Hyeon-Su Lee),인정제(Jeong-Je Yin),채수원(Soo-Won Chae) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
During forming of large automotive body panel, die components deflect due to the forming loads transmitted through the contact between various press and die components. Because die deflection results in forming defects and non-uniform material flow, time consuming corrective action to maintain uniform gap between dies, so called die spotting, should be done before the completion of dies. In this study, to predict the die deflection accurately, a structural analysis procedure considering the deformation of press-die assembly and the thickness variation of blank simultaneously is presented. The analysis procedure is applied to the optimization of the position and height of balance block for simplified automotive model die. The optimization results show much improved contact state between the blank and dies.
박동환,현경환,이명준 한국소성∙가공학회 2020 소성가공 : 한국소성가공학회지 Vol.29 No.2
Wire drawing is a metalworking process used to reduce the cross-section of a wire by pulling the wire through multi-stage drawing dies. The aim of this study is to fabricate a drawing wire using 2 stage drawing process. The finite element analysis of wire drawing was conducted to validate the efficiency of the designed process and the experiment was performed to validate the designed wire drawing process using 2 stage tungsten carbide die. Dry lubricant with powder was applied for producing a wire of desired diameter. Finally, a drawing wire using 2 stage die for cold rolling mill was developed.
A Study on the Development of Two side carrier Type Progressive Die for Multi-Stage Drawing Process
Sim, Sung-Bo,Jang, Chan-Ho,Lee, Sung-Taeg 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-
The production part requiring multiple processes such as piecing, blanking and notching are performed with a high production rates in progressive die. In order to prevent the defects of process result, the optimum of strip process layout design, die design, die making, and tryout with inspection etc. are needed. According to these factors of die development process, they required theory and practice of metal working process and its background, die structure, machining conditions for die making, die materials, heat treatment of die components, know-how and so on. In this study, we designed and analyzed die components also simulated the strip process layout of multiple stage drawing by DEFORM. Especially the result of tryout and its analysis become to the feature of this study.