Abrasive Grain Efficiency and Surface Roughness in Machining Magnesium Alloys by Newly Developed Cup-type Diamond-Grinding-Wheels
New cup-type diamond-grinding-wheels with hexagonal pattern have been developed.Grinding stone ratio, R is defined as the ratio between the hexagonal edge area containing abrasive grains and the total area of the wheel surface. In the present work, four kinds of hexagonal grinding wheels with different R (13 %, 19 %, 25 % and 36 %) and a conventional wheel (R: 100 %) were used to grind a light metals, which was represented by magnesium alloy AZ31B. Efficiency of abrasive grains and ground surface for machining a light metals were evaluated by calculating the number of abrasive grains which pass through a unit length of a sample surface for each grinding pass, Ng. The results show that surface roughness becomes smaller, i. e., smoother surfaces as Ng increases. Surfaces ground by the conventional wheel are rougher than those by using newly developed hexagonal grinding-wheels in spite of the larger Ng for the conventional wheel. Surface roughness data forms one curve in roughness vs. Ng graph for all hexagonal wheels, and forms another curve for the conventional grinding-wheel. The difference of two curves indicates that the number of effective working abrasive grains in hexagonal wheels is about 5 times higher than that of the conventional wheel. The similar results were obtained for machining sapphire according to our previous work. Hexagonal wheels show higher abrasive grain efficiency for machining not only hard-to-machine ceramics but also light metals such as magnesium alloys than conventional wheels.
Hezagonal Structure Cup-type Diamond Grinding Wheel Magnesium Alloys Light Metals Surface Roughness Abrasive-grain Efficiency
Tien Dong NGUYEN Koji MATSUMARU Masakazu TAKATSU Kozo ISHIZAKI
Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan Nano-TEM Co., Ltd., Shimogejo 1-485, Nagaoka, Niigata 940-0012, Japan
国际会议
10th International Symposium on Eco-Materials Processing and Design(第10届国际生态材料加工与设计研讨会)
西安
英文
769-772
2009-01-13（万方平台首次上网日期，不代表论文的发表时间）