Machining method of on-machine detection and correction of small hole of numerical control EDM in turbine blade

Abstract

Disclosed is a machining method for on-machine test deviation correction of numerical control electric spark holes of a turbine blade. An electric spark hole machining tool used by the machining method is at least equipped with six numerical control axes including four linear axes and two rotating axes, the linear axes are X axis, Y axis, Z axis and W axis, and the rotating axes are B axis and C axis. The method is characterized by comprising the steps of: (1) setting an on-machine displacement measuring head; (2) selecting measuring points; (3) clamping a standard sample; (4) acquiring mechanical coordinate values of six measuring points of the standard sample; (5) clamping a to-be-machined piece of the turbine blade; (6) performing measurement and deviation correction of a to-be-machinedpiece leveling feature group of the turbine blade; (7) performing measurement and deviation correction of a to-be-machined piece rotating feature group of the turbine blade; (8) performing measurement and deviation correction of a to-be-machined piece origin feature group of the turbine blade; and (9) correcting deviation in hole machining. The method is high in machining precision, high in position and angle precision of air film holes and high in machining efficiency, and can organically combine on-machine test with actual machining.

Description

technical field [0001] The invention relates to the on-machine detection of machining parts by a numerical control electric discharge small hole machine, in particular to a processing method for on-machine detection and deviation correction of numerical control electric discharge small holes of turbine blades such as aeroengines and steam turbines. Background technique [0002] An aeroengine is an engine that provides the power required for flight to an aircraft. There are three main types: piston aeroengines, gas turbine engines, and ramjets. Among them, the gas turbine engine is the most widely used, and the gas turbine engine is a thermodynamic machine that converts the chemical energy of fuel into shaft work or aircraft propulsion work. [0003] The airfoil of the turbine blade includes a concave pressure surface and a convex suction surface. The pressure surface is also called the blade basin, and the suction surface is also called the blade back. Different radial sec...

AI Technical Summary

Problems solved by technology

[0007] The invention provides a processing method for on-machine detection and correction of the small holes of numerical control electric discharge of turbine blades, the purpose of which is to solve the problem of large processing errors of the air film holes on the existing turbine blades, so as to improve the position and angle of the air film holes on the turbine blades precision

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