فهرس المقالات Dimple

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  1 - A Study on the Forming of Sheet Metal Parts Using Multi-Point Forming Technology
  Vahid Rikhtehgar Nezami Behrooz Zareh Abbas Vafaee Sefat
  In recent years, in order to reducing die design and manufacturing costs, Multi point forming technique has gained an increasing interest because of its high flexibility. In this process, the conventional fixed shape solid die sets are replaced with a pair of opposite m أکثر

  In recent years, in order to reducing die design and manufacturing costs, Multi point forming technique has gained an increasing interest because of its high flexibility. In this process, the conventional fixed shape solid die sets are replaced with a pair of opposite matrices of controllable elements. In this paper, the fundamental principles of multi-point forming was described and the possibility of forming the one sheet metal part by this technique was investigated experimentally and analyzed using finite element simulation. Wrinkles and dimples are the most typical defects in multi-point forming of sheet metal. By the proper selection of process parameters the sound cup with good surface quality and uniform thickness distribution can be formed. The results obtained demonstrated that multi-point forming technology can be used as an effective and economic tool to the forming of single parts with different shapes and is cost-effective. تفاصيل المقالة
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  2 - Fabrication of Various Dimple Shapes and Arrays on a Hypereutectic Al-Si Alloy Using a Turning Process
  Jaharah A. Ghani Faarih Farhan Mohd Nasir Mohd Nasir Mohd Nor Azam bin Mohd Dali Wan Fathul Hakim W. Zamri Mohd Shahir Kasim Che Hassan Che Haron
  A hypereutectic Al-Si alloy piston has great potential for use in the automotive industry, especially for engine components, due to its lightweight, excellent castability, good thermal conductivity, high strength and excellent corrosion resistance. The silicon content i أکثر

  A hypereutectic Al-Si alloy piston has great potential for use in the automotive industry, especially for engine components, due to its lightweight, excellent castability, good thermal conductivity, high strength and excellent corrosion resistance. The silicon content in the A390 is between 17-18%. This article presents various shapes of dimples that can be fabricated on a cylindrical shape part of A390 using the turning process with aid of dynamic assisted tooling (DATT). To minimize the number of the experiment, the Taguchi method, with an L8 orthogonal array, was used to accommodate two different sets of seven parameters used in the fabrication of dimpled structures, i.e. cutting speed of 2-9 m/min, feed rate of 0.4-0.6 mm/rev, DOC of 0.05-0.01 mm, frequency of 15-28 Hertz, the amplitude of 1-3 mm, using two different cutting tool i) rake angle of +4o and -8.5o, relief angle of 4o and 7o, and nose radius of 0.4 and 0.8 mm, ii) Rake angle of +9° and -20°, and relief angle of +7° and +17°, and nose radius 8 mm. By using these turning parameters, 3 dimple shapes were produced; spherical, short drop and long drop shapes, with almost square and hexagonal arrays. تفاصيل المقالة