基于逆向工程的变截面涡旋盘快速精度诊断

针对变截面涡旋盘形状复杂程度高、传统检具检验难度大、检测精度低的特点,提出一种基于逆向工程的涡旋盘加工精度快速诊断方法。首先,建立基于Pro/E的变截面涡旋盘三维实体模型并将其作为参考模型;然后,利用ROMER六轴75系列绝对关节臂测量机测得加工涡旋盘的表面点云数据,精简后作为数字化模型,并将上述两个模型进行对比分析以获取涡旋盘的加工精度信息;最后,提出了基于图形制导的数模匹配原则以提高数字化模型与参考模型的对齐精度,采用3种方法降低数据处理误差。结果表明,变截面涡旋盘的加工精度和形位公差符合要求,为复杂型面机械产品加工精度诊断提供了准确、快捷和直观的方法。

Rapid Precision Diagnosis of Non-uniform Scroll Part Based on Reverse Engineering

Non-uniform scroll parts are more difficult to be examed with traditional fixtures and calibration precision is relatively low because of their compicated shape. In response to the above feature, an approach of rapid precision diagnosis of non-uniform scroll part based on reverse engineering is presented. First a 3D solid model of non-uniform scroll part was created in the Pro/E environment and used as the reference model, and then cloud data of the scroll part machined was collected using the ROMER measuring arm and treated as digital model. The two models are compared to abtain machining precision information of the scroll part. Graphics-directed matching principle of mathematical models is proposed to improve alignment precision of the digital model. In this approach, alignment of multi-look cloud data, de-noising of scattered cloud data and data compacting integrated by random and curvature sampling are adopted to decrease the data-processing error. Analysis of 2D, 3D and geometric tolerance evaluation between the reference and digital models show that the machining precision and geometric tolerance of the presented non-uniform scroll part are satisfied. This study provides a rapid, accurate and visual method of precision diagnosis for complex surfaced mechanical products.