Devolopment of Curvilinear Slitting Apparatus of Thin Sheet Metals and Its Applications

提出了一种利用轧机和琴丝作为多功能切割装置和工具的薄板材料曲线分切新方法。通过使用计算机控制的导轨，使钢琴丝沿板材宽度的方向移动，可以在辊子的入口产生各种曲线。从几何角度出发，导出了导板在辊口处的运动与辊口处生成的曲线之间的关系。实验研究了线径d和辊缝G对分切产品质量和尺寸精度的影响。实验结果表明，采用直径等于或略大于板材厚度的线材，设置辊缝G略大于线材直径d，可以成功进行0.1 mm厚铝板的分切。分切板的边缘质量取决于所用线材的形状，但应强调的是，分切边缘没有毛刺。结果表明，该方法不仅可以实现板材的曲线分切，还可以实现板材的锥形分切和曲面折边板材的平面内弯曲等附加加工。

A new method is proposed for curvilinear slitting or cutting of thin sheet materials, in which a rolling mill and piano wires are used as a versatile cutting device and tool. Various curves can be generated at the entrance of the rolls by using a computer controlled guide which moves the piano wire in the direction of the width of a sheet. A relationship between the movement of the guide at the entrance of rools and the generated curve at the exit of rolls is derived from geometrical consideration. The effects of wire diameter d and roll gap G on the quality and dimensional accuracy of slitted products are also examined experimentally. The experimental results show that the slitting of aluminium sheet of 0.1 mm thickness can be successfully carried out by using a wire with diameter equal to or slightly larger than the thickness of sheet and by setting the roll gap G slightly larger that the wire diameter d. The quality of the edge of slitted sheet depends on the shape of wire used, but it should be emphasized that there is no burr at the slitted edge. It is also shown that not only the curvilinear slitting of sheet materials but also other value added processes such as tapered slittting and in-plane bending of a sheet with curvilinear hem can be easily achieved by this new method.