Computer Integrated Measurement Technology Research Of Turbine Blades

Turbine blade is one of the key components of the turbine, Its design and processing quality directly determine the efficiency of the turbine’s energy conversion. Due to the stability and precision of current domestic CNC machining process system can not meet the quality requirements of the turbine blades. Therefore, the turbine blade manufacturing process require timely feedback by CMM measurements. In order to achieve this goal, The blade manufacturer for Blade turbine mass production should have a strong CMM detection capability. This paper aims to explore the means by technical improvements to improve the company’s CMM detection capability with the company’s existing CMM inspection resources unchanged. This paper mainly do the following research:(1)Explore and identify the specific CMM’s optimal combination of DCC(direct computer control direct computer control) parameters by orthogonal experiment. To improve the detection efficiency of CMM while ensuring its detection accuracy. Guide the actual batch blade inspection by CMM.(2)The geometric characteristics of the steel turbine blades are classified by probe type,probe angle and attachment plane which used in the CMM detection. Using polychromatic set the constrained model of square steel turbine blade CMM inspection global path planning. To sort the geometric characteristics of square steel turbine blade. According to the body type line change curvature of the leaf to extract detection point.At the same time,Conduct CMM inspection path planning of leaves the body-surface by section method.(3)Extract all parameters which used in the square steel turbine blade’s design process from its parameterization file. Using them to represent the three-dimensional theoretical coordinates value and the direction vector of the optimized CMM inspection points. Drivering generate square steel blade CMM inspection program which is Parametric representation. To achieve the square steel turbine blade’s integration of measure and design.(4)Using iteration method to establish the steel blade CMM measuring crude coordinate.Design and development of CMM batch testing fixture, taking square steel blade measuring rough coordinates to coordinate measuring machines. Align adjustment the Square steel blade theory(design) coordinates and CMM measuring crude coordinate which is builded by the nearest neighbor iterative matching algorithm. Design the repeat and comparison test to validate the measurement accuracy and stability of CMM inspection fixture.On the basis of the above research, complete the creation of blade CMM inspection information management database, Design and development the CMM measurement and control system of the steel blade by using of PC-DMIS secondary development technology and ADO.NET database access technology.To achieve the CMM measurement data of blade automatically stitching, analysis and measurement reports automatic saving. Change the steel blade manual interaction measurement for automatic measurement. Improve the efficiency of the steel blade CMM testing.