论文部分内容阅读
针对数控渐进成形中钣金件厚度不均匀的问题,提出一种新的挤压方向与水平面成一定角度的倾斜挤压成形方式。该方法采用根据成形角优化的倾斜轨迹,并沿着垂直于该倾斜轨迹的方向挤压板材。而传统方法多采用挤压工具沿Z轴方向的竖直挤压成形方式。采用数值模拟和实际成形实验相结合,对比分析了倾斜挤压方式和竖直挤压方式对成形件厚度均匀化的影响。数值模拟结果表明:竖直挤压时板材件厚度差为0.4011 mm,倾斜挤压时板材件厚度差为0.3883 mm,即倾斜挤压时板材件厚度差较竖直挤压时小,说明倾斜挤压时板材件厚度更均匀一些。成形实验结果也表明:竖直挤压时板材件厚度标准差为0.099 mm,倾斜挤压时板材件厚度标准差为0.0933 mm,因此,倾斜挤压成形较竖直挤压成形能够使板材件厚度分布更均匀。
Aiming at the problem of uneven thickness of sheet metal parts in NC progressive forming, a new inclined extrusion method with a certain angle between extrusion direction and horizontal plane is proposed. The method uses an inclined trajectory optimized according to the forming angle and presses the sheet along a direction perpendicular to the inclined trajectory. The traditional method of multi-use of the tool along the Z axis along the vertical extrusion method. The effects of inclined extrusion method and vertical extrusion method on the uniformity of forming thickness were analyzed by numerical simulation and actual forming experiment. The numerical simulation results show that the difference of thickness of the sheet is 0.4011 mm in the vertical extrusion and 0.3883 mm in the thickness of the sheet. The thickness difference of the sheet is smaller than that in the vertical extrusion, Pressure plate material more uniform thickness. The results of forming experiments also show that the standard deviation of the thickness of the sheet is 0.099 mm in the vertical extrusion and 0.0933 mm in the thickness of the sheet in the oblique extrusion. Therefore, the vertical extrusion of the inclined extrusion can make the thickness of the sheet Distribution more evenly.