Three-dimensional model rebuilding method of aviation engine blade tip missing parts

Abstract

The invention discloses a three-dimensional model rebuilding method of aviation engine blade tip missing parts. The three-dimensional model rebuilding method adopts the following process steps: 1) picking out abraded blades appropriate for being repaired in an extension mode and cutting the abraded parts flat; 2) measuring the blades to be repaired with a high-accuracy digitization three-dimensional measurement instrument to acquire three-dimensional point cloud data of the parts to be repaired; then conducting denoising, data compaction and data pre-processing on the point cloud data; 3) rebuilding the abraded blades to be with the rebuilding accuracy >=0.02mm by adopting a non-uniform rational B-spline (NURBS) method; 4) extending curved surfaces and rebuilding a three-dimensional model of missing parts of the abraded blades with rebuilding accuracy+ / - 0.02mm; and 5) conducting intersection and cutting a plurality of extended NURBS curved surfaces to acquire the three-dimensional model of the missing parts of the abraded blades. An analytical method, a partition method, a tracking method or an implicit function method is adopted by the algorithm of intersection of the curved surfaces.

Description

technical field [0001] The invention relates to modeling of complex curved surfaces and advanced geometric processing technology, in particular to a method for reconstructing a three-dimensional model of a missing part of an aeroengine blade blade tip. Background technique [0002] The blade is a key part of an aero turbine engine, and its material is expensive and its manufacturing process is complicated. During the use of military and civilian turbine engines, a large number of turbine blades need to be replaced and repaired in time due to blade tip wear every year. Due to the complex manufacturing process of turbine blades and the high price of blades, the cost of repairing blades is far lower than the cost of replacing blades. Therefore, the economic benefit of blade extension repair is very high. In the past, manual argon tungsten arc welding was mainly used to repair the tip of the turbine blade. The repair quality was limited by the technical level of the workers, an...

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Problems solved by technology

But it has the following problems: the height-to-width ratio of the blade edge area is high, and the filling is difficult; for blades with complex curved surfaces, they cannot be completely fitted with standard molds, making the filling process unstable; for the heat control of the laser cladding process , it must be controlled that the mold and the blade will not be consolidated together due to heat conduction

[0009] However, after searching the literature, there is no report on the establishment of a three-dimensional model of the missing part of the aero-engine defect blade using the surface extension method

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