A Method for Dimensional Accuracy Control of Precision Casting Turbine Guide Vanes without Allowance

Abstract

The invention belongs to the precision casting technology, and relates to a method for controlling the dimensional accuracy of a precision casting turbine guide vane without margin. It is characterized in that the steps of controlling the size precision of the guide vane are as follows: the precision control of the airfoil size of the guide vane; the precision control of the size of the exhaust side of the guide vane. The invention proposes a method for controlling the dimensional accuracy of the turbine guide vane without margin. Considering the impact of subsequent processing on the blade size, the dimensional accuracy of the guide vane meets the design requirements, shortens the setting cycle of the guide vane mold, and ensures Consistency of guide vane quality.

Description

technical field [0001] The invention belongs to the precision casting technology, and relates to a method for controlling the dimensional accuracy of a precision casting turbine guide vane without margin. Background technique [0002] Aeroengine turbine guide vane is a part composed of a large number of free-form surfaces and edge plates, and its aerodynamic shape, dimensional accuracy, edge plate profile, and forming accuracy require high requirements. At present, the turbine guide vanes of aero-engines are affected by various factors such as precision casting molds, materials, and precision casting processes. The forming precision of the guide vanes is low, the quality is unstable, the weight is out of tolerance, and the scrap rate is high, which restricts the development of new aero-engines in my country. technical obstacles. The dimensional accuracy of turbine guide vanes is mainly guaranteed by precision casting wax molds. The invention patent application "a shrinkage r...

AI Technical Summary

Problems solved by technology

At present, the turbine guide vanes of aero-engines are affected by various factors such as precision casting molds, materials, and precision casting processes. The forming precision of the guide vanes is low, the quality is unstable, the weight is out of tolerance, and the scrap rate is high, which restricts the development of new aero-engines in my country. technical barriers

The dimensional accuracy of turbine guide vanes is mainly guaranteed by precision casting wax molds. The invention patent application "a shrinkage rate design method for multi-blade guide vane precision casting molds" (application number 201410604620.6) discloses a control of the dimensional accuracy of turbine guide vanes method, this method only considers the theoretical shrinkage of the guide vane in three dimensions, and does not take into account the influence of subsequent processing on the size of the guide vane. The dimensional accuracy of the guide vane produced by the wax mold mold designed by this method cannot meet According to the design requirements, after the guide vane is delivered for processing, if the size of the guide vane is found to be out of tolerance, the mold can only be repaired or the casting is polished, so that the setting cycle of the guide vane mold is greatly prolonged, the labor workload of the workers is increased, and the quality consistency of the guide vane cannot be guaranteed. Even cause the mold to be scrapped

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