Effect of Difference of Tool Rotation Direction on Forming Limit in Friction Stir Incremental Forming
Effect of Difference of Tool Rotation Direction on Forming Limit in Friction Stir Incremental Forming
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DOI：
10.4028/www.scientific.net/kem.622-623.390
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发表时间：
2014-09
期刊：
影响因子：
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通讯作者：
M. Otsu;Y. Katayama;T. Muranaka
中科院分区：
文献类型：
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作者：
M. Otsu;Y. Katayama;T. Muranaka
研究了搅拌摩擦增量成形中刀具旋转方向对成形极限的影响。采用三轴数控铣床和直径为6 mm的高速钢半球形刀具进行成形。市售A5052-H34铝板的厚度为0.5mm，使成形工具以0.5mm间距从外侧向内侧移动，将板成形为截头棱锥形状。通过改变刀具旋转速度、刀具进给速度和刀具轨迹方向，研究了用棱锥最小壁角评价成形性的方法。当刀具轨迹为顺时针和逆时针时，分别定义为“前进方向”和“后退方向”，以及搅拌摩擦焊。从实验结果来看，前进和后退两个旋转方向的成形极限基本相同，但前进方向的成形工况范围略宽于后退方向。以工具表面与板料的相对速度来评价成形极限，得出了前进方向与后退方向成形极限无差别的结论。
An effect of tool rotation direction on forming limit in friction stir incremental forming was studied. A 3-axes NC milling machine and a hemispherical tool which with a diameter of 6 mm made of high speed steel was used for forming. The thickness of commercial A5052-H34 aluminum sheet was 0.5 mm. The forming tool was moved from the outside to inside in a pitch of 0.5 mm spirally, and the sheets were formed into frustum of pyramid shape. Formability evaluated by minimum wall angle of the pyramid was investigated by changing a tool rotation rate, tool feed rate and tool path direction. When the tool paths were clockwise and counter clockwise, they were defined to “advancing direction” and “retreating direction” as well as in friction stir welding, respectively. From the experimental results, forming limits by both rotation directions of advancing and retreating were almost the same, however, the range of formable working conditions in advancing direction was slightly wider than that in retreating direction. Evaluating the forming limits in relative velocity between the tool surface and the sheet, no difference of forming limit was obtained between forming in advancing direction and retreating directions.