Effect of Tool Rotational and Al2O3 Powder in Electro Discharge Machining Characteristics of NiTi-60 Shape Memory Alloy
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- 作者：Saeed Daneshmand ; Vahid Monfared ; Ali Akbar Lotfi Neyestanak
- 关键词：Electro discharge machining ; NiTi60 ; Shape memory alloy ; Rotary tool ; Al2O3 powder
- 刊名：Silicon
- 出版年：2017
- 出版时间：March 2017
- 年：2017
- 卷：9
- 期：2
- 页码：273-283
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Inorganic Chemistry; Materials Science, general; Optics, Lasers, Photonics, Optical Devices; Environmental Chemistry;
- 出版者：Springer Netherlands
- ISSN：1876-9918
- 卷排序：9
文摘
Nickel titanium is an intelligent alloy which are used in optical devices, thermal sensors, actuators, medical equipment and aerospace, because memory shape property, high strength, good creep and fatigue resistance. This alloy has features like the response to electrical stimulation, thermal, magnetic and mechanical stimulation. According to hardness and mechanical properties of this alloy, one of the ways it is used for machining, is EDM. EDM is one of the machining of precision and complex parts methods which material removal rate, tool wear rate, surface roughness and thickness of the recast layer one is very important in it. In this study the effect of current, voltage, pulse on time, pulse off time, tool rotational, Al2O3 powder, material removal rates, tool wear rate and surface roughness are examined. The results show that using Al2O3 powder and tool rotational along with increasing current intensity, pulse on time and voltage, increases the material removal rate. Rotation of the tool create a centrifugal force and Al2O3 powder increases the gap and the material removal rate. Rotation of the tool prevents spreading of the plasma channel and Al2O3 powder fills gap between tool and workpiece, decrease kinetic energy of ions and reduced tool wear rate. By adding powder Al2O3, rotation of the tool, reducing current intensity, voltage and time pulse, sparks get smaller and will have less penetration and surface roughness reduces.