Turbine blade air film cooling hole self-adaptive compensation machining method

Abstract

The invention discloses a turbine blade air film cooling hole self-adaptive compensation machining method. The method comprises the following steps: installing a turbine blade on a follow fixture; performing online measurement on the curved surface profile of the turbine blade to obtain an actual measurement point cloud; extracting a fine and uniform standard attitude point cloud of the curved surface profile area from a design model; establishing a design model coordinate system, a machine tool coordinate system and a clamp coordinate system, and deriving a transfer matrix; converting an attitude point cloud into a clamp coordinate system, and converting the actual measurement point cloud into the clamp coordinate system; deriving a pose deviation; extracting hole position coordinates ofair film cooling holes, and converting the hole position coordinates into a machine tool coordinate system; establishing real hole site mapping; carrying out kinematic modeling; calculating coordinateparameters of all shafts of the machine tool to obtain the machining attitude of the air film cooling hole; and inputting the compensated air film cooling hole machining program into the machine tool. Due to the application of the method, the machining precision of the turbine blade air film cooling hole can be improved, and the robustness for the profile error and the pose error of the turbine blade is high.

Description

technical field [0001] The invention relates to the field of machining turbine blades, in particular to an adaptive compensation machining method for air film cooling holes of turbine blades. Background technique [0002] Turbine blades are key components in aero-engines, and the surface of modern aero-engine turbine blades contains many film cooling holes that communicate with the inner cavity. When the aero-engine is working, the cold air flow enters the combustion chamber from the inner cavity of the turbine blade through the air film cooling hole, and forms a layer of air film on the surface of the blade, which plays the role of heat insulation and cooling. The processing accuracy of the film cooling hole, including the position, angle, diameter, etc. of the hole, has a decisive influence on the cooling effect. [0003] In the precision machining of traditional castings, the fine datum is first processed according to the rough casting datum, and then the casting allowan...

AI Technical Summary

Problems solved by technology

However, due to the small number of measurement points, it is more sensitive to the contour error at the measurement point and cannot reflect the contour error of other positions of the blade.

At the same time, it is necessary to redesign the measurement and adjust the algorithm for parts of different shapes, and the migration cost is high.

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