• Title/Summary/Keyword: Warm Deep Drawing

Search Result 68, Processing Time 0.033 seconds

A Study on the Warm Deep Drawabilities of Galvannealed Steel Sheet (합금화 용융 아연 도금강판의 온간 딥드로잉 성형성에 관한 연구)

  • 장성호;서대교
    • Transactions of Materials Processing
    • /
    • v.11 no.5
    • /
    • pp.423-429
    • /
    • 2002
  • The limiting drawing ratio (LDR) under uniform heating of blanks was measured at the various temperature ranges between 25 and 25$0^{\circ}C$ by using two different blank shapes, square and circular blanks, and six different blank sizes with the drawing ratios(DR) of 2.4 to 2.9. The galvannealed steel sheet (SCP3CM 60/60) of 0.7mm thickness were used. The LDR at warm forming condition reached 1.2 times of that at room temperature, and the maximum drawing depth reached 1.9 times. The higher temperature was adopted, the more stable and uniform thickness strain distribution was observed. Some cases of the experimental results were compared with the analitical results using the commercial finite element method (FEM) code.

A Study on the Improvement of Drawing Limit in Stainless Butt Products using Warm Deep Drawing Process (온간 성형법을 이용한 스테인리스 버트 제품의 성형한계 향상에 관한 연구)

  • 김승수;나경환;김종호;한창수
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 1995.03a
    • /
    • pp.203-210
    • /
    • 1995
  • The rapid progress of automobile industry has led to a demand for sheet metal products and the new forming technology for complex product is required. In Deep Drawing process of steel sheet, especially stainless steel sheet at room temperture, some intermediate annealing need to be added to lessen strain hardening effect. The present study is concerned with the wram deep drawing of stainless steel sheet. In order to reduce the number of working process. the limit drawing ration is considered as main parameter. In this study, the effect of process variables such a sblank holder force, working temperature and lubricant on limit drawing ration is investigated . Experiments are carried out for the hemisherical and sqare shape at room and warm temperature respectively. The drawing loads and thickness deviation accoring to process variables measured . As the result of apploying those experimental data to the commerical butt product, the number of process can be reduced and good quality of products can be obtained.

  • PDF

Comparision of Warm Deep Drawability of Square Cups Using Circular Clad Sheet Metals (원형 클래드 판재를 이용한 정사각컵 온간 디프 드로잉성 비교)

  • Ryu H. Y.;Kim Y. E.;Kim J. H.;Chung W. J.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2001.05a
    • /
    • pp.89-93
    • /
    • 2001
  • This study was carried out to investigate the warm deep drawability of square cups of clad sheet metals, by changing temperatures of die and blankholder and blank materials. Two kinds of clad sheet metals, STS304-A1050-STS304 and STS304-A1050-STS430 were chosen for experiments. The relative drawing depth of STS304-A1050-STS304 clad sheet was increased up to 4.4 at $150^{\circ}C$ that was $29\%$ higher than at room temperature, whereas STS304-A1050-STS430 material was improved to 3.65 at $120^{\circ}C$ which was $16\%$ better than at room temperature. In addition, comparison of wall thickness and hardness of a warm drawn cup with those of room temperature showed more even distributions. Therefore, warm forming technique was confirmed to ive better results in deep drawing of stainless clad sheet metal.

  • PDF

Experimental Study on the Formability of Simultaneous Deep Drawing of Circular and Rectangular Cups with AZ31 Magnesium Alloy (AZ31 마그네슘 판재의 더블 싱크형 딥드로잉 공정의 성형성에 관한 실험적 연구)

  • Kwon, K.T.;Kang, S.B.;Kang, C.G.
    • Transactions of Materials Processing
    • /
    • v.17 no.8
    • /
    • pp.586-593
    • /
    • 2008
  • In warm press forming of magnesium alloy sheet, it is important to control the sheet temperature by heating the sheet in closed die. When forming a commercial AZ31 magnesium alloy sheets which are 0.5mm and 1.0mm thick, respectively, time arriving at target temperature and temperature variation in magnesium alloy sheet have been investigated. The deep drawing process with rectangular shape alone at the first stage and with both circular and rectangular shapes at the second stage was employed. At the first stage, through deep drawing process with rectangular shape alone according to various forming temperature($150{\sim}350^{\circ}C$) and velocity($0.1{\sim}1.0mm/s$), optimum forming condition was obtained. At the second stage, deep drawing process with the circular and rectangular shapes were performed following deep drawn square cups with Limited Drawing Height(LDH) obtained at the first stage. Here, clearance which is defined a gap between the die and the punch including sheet was set to ratio of 20, 40 and 100% to thickness in sheet. Accordingly, temperature, velocities, and clearances suitable for forming were suggested through investigating the thickness variation of the product.

Reduction of Drawing Process in Warm Forming Steel Sheets using Oil Pan (온간성형공법을 이용한 오일팬 드로잉공정 단축)

  • 최이천
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 1999.03b
    • /
    • pp.88-94
    • /
    • 1999
  • This study is to investigate the effects of warm deep drawing with steel sheets of SCP3C and SCP1 for improving deep drawability. Experiments were carried out in various working conditions such as forming temperature and lubricantion. The effect of lubricantion and temperature on drawabillity of steel sheets as well as thickness distribution of drawn oil pan were examined and discussed. One step forming at room temperature and uniform distribution of thickness was achieved at optimum formability for lubricantion. The optimum forming temperature was obtained that both the die and the blankholder were heated to 10$0^{\circ}C$ while the punch was cooled by circulating coolant of $0^{\circ}C$.

  • PDF

Finite Element Analysis of warm Circular Cup Deep Drawing Process of AZ31 Sheet (AZ31 판재의 온간 원형컵 딥드로잉 공정의 유한요소 해석)

  • Lee, M.H.;Kim, H.Y.;Kim, H.K.;Oh, S.I.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2007.10a
    • /
    • pp.230-233
    • /
    • 2007
  • Due to their low density, high specific strength and electromagnetic interference shielding, magnesium alloy sheets are used increasingly more often in automotive, aerospace, and electronics industries. However, magnesium ally sheets should be usually formed at elevated temperature because of their poor formability at room temperature. For the use of magnesium alloy sheets for an industrial, their mechanical properties at elevated temperature and appropriate forming process conditions have to be developed. In this study, the warm deep drawing process of AZ31 sheets is studied numerically by non-isothermal simulation. The difference between the isothermal simulation results and the non-isothermal simulation results and the progress of warm forming are discussed.

  • PDF

Temperature Effect On Warm Deep Drawability of Rectangular Cup Using Local Heating of Dies (금형의 국부적인 가열에 의한 사각통의 온간 디프로드로잉 성형성에 미치는 온도의 효과)

  • Kim, Chang-Ho;Park, Dong-Hwan;Kang, Sung-Soo
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.13 no.5
    • /
    • pp.53-59
    • /
    • 1996
  • Warm deep drawing of single-action dies using local heating has appeared to be an alternative attractive production method of multi-operation die sets generally used at room temperature in deep drawing of rectangular cup. Uniaxial tensile tests and deep drawing tests of various materials are carried out and the effect of temperature on tensile properties and drawability are examined at temperatures up to 200 .deg. C under three kinds of lubricants of teflon film, vinyl film and drawing oil. Good formability is achieved when punch and die temperature were differentiated intentionally in order to get large tensile strength(TS) at punch shoulder protion and small TS at die side. Throughout the experiments, it has been shown that the limiting drawing height of STS316L was increased with heating die and blank holder at 100 .deg. C, but that of STS430 wasn't. When vinyl or teflon film was attached on the plates, the drawability was increased considerably.

  • PDF

A Study on the press warm forming of stainless-aluminum clad sheet metals (스테인레스-알루미늄 클래드 강판재의 프레스 온간 성형 연구)

  • 류호연;박건규;김종호
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 1998.06b
    • /
    • pp.8-18
    • /
    • 1998
  • The effect of press warm forming in cylindrical deep drawing of stainless-aluminum clad sheet metals are examined . The temperature of die and blank holder is varied from room temperature to 20$0^{\circ}C$, while the punch is kept cooled during test to increase the fracture strength of workpiece on the punch corner area. Test materials chosen for experiments are STS304-Al050-STS304, STS304-A1050-STS430-, STS304 and Al050 metals and teflon film as a lubricant is used on both sides of a workpiece. The limit drawing ration as well as quality of drawn cups (distribution of thickness and hardness)are investigated and discussed.

  • PDF

A Study on the Drawability of Clad Sheet Metal (STS304-A1050-STS304) by Warm Draw Die (온간금형에 의한 클래드판재(STS304-A1050-STS304)의 드로잉성 연구)

  • Ryu H. Y.;Kim J. H.;Ryu J. G.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2002.02a
    • /
    • pp.136-143
    • /
    • 2002
  • Warm draw die technique which is one of the new forming technologies to improve formability of sheet metal is applied to the cylindrical and square cup drawing of stainless-aluminum clad sheets. In experiments the temperature of die and blank holder is varied from room temperature to $180^{\circ}C$, while the punch is cooled by circulation of coolant to increase the fracture strength of workpiece on the punch comer area. Test materials chosen for experiments are STS304-A1050-STS304 clad sheets. Teflon film as a lubricant is used on both sides of a workpiece. The limit drawing ratio and relative drawing depth as well as quality of drawn cups(distribution of thickness)are investigated and validity of warm drawing process is also discussed. No separation between each laminated material after drawing occurred through inspection by microscope as well as application of penetrant remover and bond strength test. Therefore, warm forming technique was confirmed to give better results in deep drawing of stainless clad sheet metal.

  • PDF