快速成型技术中适应性分层方法

Adaptive Slicing Procedure for Rapid Prototyping Technology

熔融沉积制造工艺中,三维模型的分层处理是造成台阶效应的直接原因.台阶效应会降低零件的表面质量.减小台阶误差的传统方法是减小分层厚度和选择合理的分层方向.为了解决传统方法中成型精度与成型效率难以协调的问题,介绍了一种适应性分层方法,首先求出能够反映模型表面形状的参考曲线,然后根据参考曲线上曲率变化情况确定分层厚度.该方法适用于截面轮廓线为抛物线形状的零件,在保证成型精度的前提下极大地缩短了成型时间,同时建立成型时间的评价模型,分析了成型时间的影响因素.

In the fused deposition modeling process, staircase effect is directly caused by slicing procedure of 3D modeling. The staircase effect can reduce the surface quality of the parts. To reduce the step error, traditional method is to reduce the layer thickness and choose a reasonable slicing direction. It is hard that molding precision coordinates with molding efficiency in the traditional method. In order to solve the problem, an adaptive slicing procedure is introduced. The procedure firstly determines reference curves that can express surface shape of the model, and then select slicing thickness according to the changes of curvature in reference curve. The method is applicable to the parts that the contour line is of parabolic shape. And the method can insure molding precision and reduce the molding time. The evaluation model of the molding time are established, and the influence factors of the molding time are analyzed.