刀切型纸层叠快速原型系统切割机理研究

CUTTING MECHANISM OF A CUTTER-BASED PAPER LAMINATION RAPID PROTOTYPING SYSTEM

采用具有自适应转向能力的刀具取代激光切割,实现一种经济型快速原型制造系统。介绍了刀具结构,采用曳物线模型分析了刀尖运动及其轨迹的形状误差机理,提出消除误差的逐接点修正方法。在已开发的试验机上制作切割样件研究割缝形态尺寸,回归分析表明在正常切割深度范围内因割缝造成的尺寸误差不超过0.003 mm。实际制作显示用这种刀具实现纸的层叠快速原型制造系统具有实用价值。

Instead of conventional laser cutting, a cutter-based laminated object manufacturing (LOM) type rapid prototyping system is proposed. The cutter set is introduced, in which the cutter can turn its cutting direction autornatically. The motion of the cutter nose can be described by the tractrix-model. According to the model, the form error caused by cutting is analyzed and a method to eliminate the error by modifying the cutter path is thus obtained. Experimental research on the cutting notch is carried out through micro-analysis. On the experimental results, the dimension error caused by the notch is analyzed and the conclusions is that within the normal range of the cutting depth the dimension error is less than 3 microns. A physical model has been fabricated on the developed test machine, which indicates the proposed low cost system has use value.