• Title/Summary/Keyword: Magnesium Alloy

Search Result 536, Processing Time 0.113 seconds

A Study on Static-Implicit Forming Analysis of the Magnesium Alloy Sheet (마그네슘 합금 판재의 정적-내연적 성형해석에 관한 연구)

  • Son, Young-Ki;Jung, Dong-Won
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.7 no.4
    • /
    • pp.44-49
    • /
    • 2008
  • The characteristic of magnesium alloy is the most light in utility metal, the effect of electromagnetic wave interception, excellent specific strength and absorptiveness of vibration. Although magnesium alloy with above characteristic is a subject matter which is suitable in world-wide tendency of electrical component frame, sheet magnesium alloy is difficult to process. Therefore, forming analysis of sheet magnesium alloy and applying warm-working to process are indispensable. Among Finite element method, the static implicit finite element method is applied effectively to analyze sheet magnesium alloy stamping process, which include the forming stage. In this study, it was focused on the crack, wrinkling and spring back on sheet magnesium alloy stamping by the static implicit analysis. According to this study, the result of simulation will give engineers good information to access the forming technique on sheet magnesium alloy. And its application is being increased especially in the production of electrical component frame for the cost reduction, saving of defective ratio, and improvement of Productivity.

  • PDF

Analysis of warm Deep Drawing of Magnesium Alloy Sheet (마그네슘 합금 판재의 온간 딥드로잉 해석)

  • Lee, M.H.;Kim, H.Y.;Kim, H.J.;Oh, S.I.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • /
    • pp.294-297
    • /
    • 2007
  • Due to their low densities and high specific strength and stiffness, magnesium alloy sheets are very attractive lightweight materials for automotive and electrical products. However, the magnesium alloy sheets are usually formed at elevated temperature because of their poor formability at room temperature. To use of the magnesium alloy sheets for an industrial, their mechanical properties at elevated temperature and appropriate forming process conditions have to be developed. In this study, non-isothermal simulations of a square cup drawing from magnesium alloy sheets have been conducted to evaluate a proper forming process conditions such as the tool temperature, the tool shoulder radius, friction between the blank and the tools. According to this study, appropriate forming process conditions of square cup drawing at elevated temperature from magnesium alloy sheets are suggested.

  • PDF

Forming Analysis for Warm Deep Drawing Process of Magnesium Alloy Sheet (마그네슘 합금 판재의 온간 딥드로잉 공정의 성형해석)

  • Lee, M.H.;Kim, H.Y.;Kim, H.J.;Kim, H.K.;Oh, S.I.
    • Transactions of Materials Processing
    • /
    • v.16 no.5
    • /
    • pp.401-405
    • /
    • 2007
  • Due to the low densities and high specific strength and stiffness, magnesium alloy sheets are very attractive lightweight materials for automotive and electrical products. However, the magnesium alloy sheets should be usually formed at elevated temperature because of their poor formability at room temperature. For the use of the magnesium alloy sheets for an industrial, their mechanical properties at elevated temperature and appropriate forming process conditions have to be developed. In this study, non-isothermal simulation of a square cup drawing of magnesium alloy sheets have been conducted to evaluate a proper forming process conditions such as the tool temperature, the tool shoulder radius, friction between the blank and the tools. According to this study, appropriate forming process conditions of square cup drawing at elevated temperature from magnesium alloy sheets are suggested.

A Study of forming limit on rotational incremental forming of magnesium alloy sheet (회전 인크리멘탈 성형을 이용한 마그네슘 합금 판재의 성형한계 연구)

  • Park, J.K.;Bae, M.K.;You, B.S.;Kim, Y.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • /
    • pp.456-461
    • /
    • 2008
  • Being a lightweight material, magnesium is increasingly employed in automotive parts. However, because of its hexagonal closed-packed (HCP) crystal structure, in which only the basal plane can move, the magnesium alloy sheets show low ductility and formability at room temperature. Thus the press forming of magnesium alloy sheets has been performed at elevated temperature within range of $200^{\circ}C{\sim}250^{\circ}C$. However, we confirmed that using rotational incremental forming magnesium alloy sheets were formed without any heating at previous study. In this study, at the forming of square cup using rotational incremental sheet forming, the strain distributions were obtained and it was compared with forming limit curve at neck (FLCN). Also, forming limit curves at fracture (FLCF) of magnesium alloy sheets were obtained at elevated temperature and it was compared with the strain distribution of square cup of magnesium alloy sheet. In this study, we confirmed that conventional forming limit curves can not predict rotational incremental forming.

  • PDF

Resistance Spot Welding Characteristics of Mg Alloy Using Process Tape (Process Tape를 사용한 마그네슘 합금의 저항 점 용접 특성)

  • Choi, Dong-Soon;Kim, Dong-Cheol;Kang, Moon-Jin
    • Journal of Welding and Joining
    • /
    • v.31 no.3
    • /
    • pp.49-53
    • /
    • 2013
  • Recently, studies about application of magnesium alloy sheet to automotive bodies are on the increase. For application to automotive bodies, researches about characteristics of resistance spot welding of magnesium alloy sheet are essential. Electrode life of resistance spot welding of magnesium alloy is very short due to sticking of magnesium alloy to copper alloy electrode. To increase electrode life, most effective method is inserting cover plate between electrode and magnesium sheet. But application of cover plate to actual process is difficult and decreases welding productivity. Process tape supplied automatically as cover plate can minimize lose of productivity and increase welding quality. In this study, resistance spot welding of magnesium alloy is carried out with applying process tape. Acceptable welding current region according to electrode force and welding time is determined.

Evaluation of Mechanical Properties for AZ31 Magnesium Alloy(1) (AZ31 마그네슘 합금 판재의 기계적 특성 평가(1))

  • Won S.Y.;Oh S.K.;Osakada Kozo;Park J.K.;Kim Y.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • /
    • pp.53-56
    • /
    • 2004
  • The mechanical properties and optical micrographs are studied for rolled magnesium alloy sheet with hexagonal close packed structure(HCP) at room and elevated temperatures. Tensile properties such as tensile strength, elongation, R-value and n-value are also measured for AZ31 magnesium alloy. Magnesium with strong texture of basal plane parallel to the rolling direction usually has high R-value and plastic anisotropy at room temperature. As temperature increases, the R-value for AZ31 magnesium sheet decreases. In addition, the AZ31 sheet becomes isotropy and recrystallization above $200^{\circ}C$. Formability of magnesium alloy sheets remarkably poor at room temperature is improved by increasing temperature. Sheet forming of magnesium alloy is practically possible only at high temperature range where plastic anisotropy disappears.

  • PDF

The tensile deformation and fracture behavior of a magnesium alloy nanocomposite reinforced with nickel

  • Srivatsan, T.S.;Manigandan, K.;Godbole, C.;Paramsothy, M.;Gupta, M.
    • Advances in materials Research
    • /
    • v.1 no.3
    • /
    • pp.169-182
    • /
    • 2012
  • In this paper the intrinsic influence of micron-sized nickel particle reinforcements on microstructure, micro-hardness tensile properties and tensile fracture behavior of nano-alumina particle reinforced magnesium alloy AZ31 composite is presented and discussed. The unreinforced magnesium alloy (AZ31) and the reinforced nanocomposite counterpart (AZ31/1.5 vol.% $Al_2O_3$/1.5 vol.% Ni] were manufactured by solidification processing followed by hot extrusion. The elastic modulus and yield strength of the nickel particle-reinforced magnesium alloy nano-composite was higher than both the unreinforced magnesium alloy and the unreinforced magnesium alloy nanocomposite (AZ31/1.5 vol.% $Al_2O_3$). The ultimate tensile strength of the nickel particle reinforced composite was noticeably lower than both the unreinforced nano-composite and the monolithic alloy (AZ31). The ductility, quantified by elongation-to-failure, of the reinforced nanocomposite was noticeably higher than both the unreinforced nano-composite and the monolithic alloy. Tensile fracture behavior of this novel material was essentially normal to the far-field stress axis and revealed microscopic features reminiscent of the occurrence of locally ductile failure mechanisms at the fine microscopic level.

Corrosion Behavior of AZ31 Magnesium Alloy during Machining (AZ31 마그네슘 합금의 절삭가공과정에서의 부식거동)

  • Kim, Jae-Hak;Kwon, Sung-Eun;Lee, Seung-Jae
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.15 no.3
    • /
    • pp.315-321
    • /
    • 2012
  • In the study, corrosion characteristics of AZ31 magnesium alloy under various environments exposed during machining(immersion in cutting oil, 5 % cutting oil aqueous solution and distilled water & contact with dissimilar metals, SPC4 and A5052-H32) were investigated. A corrosion test was performed AZ31 magnesium alloy was immersed in each electrolyte solution after contacting with each dissimilar metals, and the results were observed by an electron microscope. In immersion tests, corrosion of AZ31 magnesium alloy showed to be in the sequence of distilled water> 5 % cutting oil aqueous solution> cutting oil> air, and in the test of contact with dissimilar metals, corrosion showed to be in the sequence of SPC4> A5052-H32> AZ31. It can be concluded that to prevent corrosion during machining, AZ31 magnesium alloy must prevent contacting water and use magnesium alloy for raw material of Jig & Fixture.

Experimental Study on the Formability of Simultaneous Deep Drawing of Circular and Rectangular Cups with AZ31 Magnesium Alloy (AZ3l 마그네슘 판재의 더블 싱크형 딥드로잉 공정의 성형성에 관한 실험적 연구)

  • Kwon, K.T.;Kang, S.B.;Kang, C.G.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • /
    • pp.149-153
    • /
    • 2008
  • Since magnesium alloy sheets have been employed in industrial field which requires the light weight and thin engineering components, most of researches have been focused on the formability of magnesium ahoy sheet. 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. Sheet metals were mostly formed in simple shapes such as circular or rectangular. Few studies about forming of complex shapes were reported. Thus, the formability of magnesium alloy sheet for complex shapes is investigated. The process variable for a double sink shape deep drawing with circular and rectangular shape was investigated by varying temperature, velocities, and clearances. Accordingly, temperature, velocities, and clearances suitable for forming were suggested through investigating the thickness variation of the product.

  • PDF

Process Development for Automotive Hybrid Hood using Magnesium Alloy AZ31B Sheet (마그네슘 합금 AZ31B 판재를 이용한 자동차 하이브리드 후드 개발 프로세스)

  • Jang, D.H.
    • Transactions of Materials Processing
    • /
    • v.20 no.2
    • /
    • pp.160-166
    • /
    • 2011
  • Weight reduction while maintaining functional requirements is one of the major goals in the automotive industry. The use of lightweight magnesium alloys offers great potential for reducing weight because of the low density of these alloys. However, the formability and the surface quality of the final magnesium alloy product for auto-body structures are not acceptable without a careful optimization of the design parameters. In order to overcome some of the main formability limitations in the stamping of magnesium alloys, a new approach, the so-called "hybrid technology", has been recently proposed for body-in-white structural components. Within this approach, necessary level of mechanical joining can be obtained through the use of lightweight material-steel adhesion promoters. This paper presents the development process of an automotive hybrid hood assembly using magnesium alloy sheets. In the first set of material pairs, the selected materials are magnesium alloy AZ31B alloy and steel(SGCEN) as inner and outer panels, respectively. In order to optimize the design of the inner panel, the stamping process was analyzed with the finite element method (FEM). Laser welding by CW Nd:YAG were used to join the magnesium alloy sheets. Based on the simulation results and mechanical test results of the joints, the determination of die design variables and their influence on formability were discussed. Furthermore, a prototype based on the proposed design was manufactured and the static stiffness test was carried out. The results demonstrate the feasibility of the proposed hybrid hood with a weight reduction of 25.7%.