Design And Realization Of Aero-engine Blade Automatic Measurement Equipment Control System

The level of aircraft engine manufacturing technology reflects the aviation industry level of development.Dimension measuring is one of the essential methods to measure the processing quality of the turbine blade.As a typical free-form surface space,turbine blade is provided with complex structure.High-precision measurement needs demanding measurement environment.So the measurement equipment is usually difficult to integrate into the workshop environment.And the foreign measuring equipment had monopolized the domestic market for years.In view of the above problems,this paper presents a turbine blade automatic measurement motion control system,and a series of studies were worked for the issues of motion control,error compensation,measuring sampling and path planning.The main contents of this paper include:1.Build the measuring machine motion control system,complete the electrical system design and construction,set communication between PC and motion control card,set motion control card and servo drive communication,configure servo drive and motor connection,set servo drive and motion control Card's functional port configuration.And then based on the measurement requirements,determine semi-closed loop position control mode for the system.2.According to the requirements of turbine blade measurement,the integrity of measurement surface should be insured.This paper proposed a sampling method of turbine blade contour measurement based on improved firefly algorithm in order to solve the problem of the curvature inconsistencies in different regions of turbine blade surface.By arranging the number of measurement points and arranging the pre-distribution measurement points based on the principle of curvature variation,the sampling points were obtained.And then the measuring path was generated.And it supported the measurement path avoidance processing to improve turbine blade measuring path planning.3.To solve the problem that geometric errors and thermal error decreased Measuring machine's positioning accuracy,the corresponding measurement methods and modeling methods are determined by analyzing the mechanism of error generation.And the detection of geometric errors was realized by using the step gauge and angle gauge.Then the regression model was used to build the error model.Finally,the total geometrical error model library was established according to the quasi-rigid geometric error model.The thermal error was measured by the temperature sensor and the eddy current sensor.The result was directly applied to the geometric error data model library for generating compensation database.4.Based on the development environment built by VS2010 and Open GL,the corresponding blade measurement software was designed and developed to realize the motion control units design of coordinate measuring machine.The specific control module included CMM servo configuration,Single-axis motion controlling,multi-axis linkage controlling,hand-wheel motion controlling and position detection.Turbine blade measurement work mainly included measurement point sampling,measurement path planning,compiling measurement program,calibration ball measuring experiment,turbine blade measurement experiment.