采用CMM测量发动机叶片模具方法研究

Research on CMM Method for Measuring Die of Engine Blade

为解决传统测量设备难以对组合型块进行准确测量的问题,提出了基于CMM的叶片模具数字化测量方法。利用PC-DIMS测量软件自动获取点的理论值及矢量方向,采用迭代法建立坐标系,选取对应的扫描轨迹生成方式,设置合适的扫描密度对叶片模具进行测量,并对结果进行三维补偿。利用此方法开展了轮廓度测量实验,绘制出叶片模具轮廓偏差图,并对测量不确定度进行评定。实验证明此方法测量准确性好、自动化程度高,可准确反映叶片模具在试制阶段及使用阶段的磨损情况,为模具的返修及保养提供了重要参考。

In order to solve the problem that it is difficult for traditional measuring equipment to accurately measure the combined blocks,a digital measuring method of blade die based on CMM is proposed.The theoretical values and vector directions of the points are automatically acquired by PC-DIMS measurement software.The coordinate system is established by iteration method.The corresponding scanning trajectory generation mode is selected,and the appropriate scanning density is set to measure the blade die,and the results are compensated in three dimensions.Using this method,the profile measurement experiment is carried out,the profile deviation diagram of blade die is drawn,and the uncertainty of measurement is evaluated.Experiments show that this method has good accuracy and high automation.It can accurately reflect the wear situation of blade die in the trial production and use stage.It provides an important reference for the repairing and maintenance of the dies.