Abstract
This paper shows the results of a study of the uniformity of the allowance along the airfoil in the turbine blades workpieces. It is found that in the existing industry, there is a defect associated with a lack of allowance along the airfoil (from the blade back and pressure side) for the polishing operation in order to give the required cleanliness and roughness of the surface layer. By measuring the wall thickness of the blade airfoils, it is concluded that by mechanically modifying the technological bases on the blade, it is possible to select the optimal position of the workpiece in the template instrument, at which the allowance along the airfoil is relatively uniform, and the dimensions of the blade wall thickness will be within the specified tolerance.
Highlights
The accuracy of the parameters of the technological process of manufacturing the GTE turbine blades is characterized by the control of the airfoil of the blade workpiece
The accuracy coefficient КТ > 1 for the rest of the turbine blade workpieces indicates the instability of the technological process and the presence of defects, both in the structure of the blade casting and in the thinning of the blade airfoil wall, which increases the cost of the production process and reduces the product quality
This requires the implementation of design and technological measures to improve the technological process of manufacturing castings of turbine blades and component parts of the casting mold, as well as to reduce the scattering parameters during polishing of the blade airfoil
Summary
The accuracy of the parameters of the technological process of manufacturing the GTE turbine blades is characterized by the control of the airfoil of the blade workpiece. A blade wall thickness that is too small can contribute to the early burnout of the blade and, to underestimated engine thrust values For this reason, strict requirements for tolerances are imposed on the profile of the blade workpiece during the inspection process – from ± 0.2 to ± 0.4 mm in different sections of the blade back and pressure side of the blade workpiece. This design solution will be relevant for 5% of blades, which today are rejected in batch production according to the criterion of the lack of uniform distribution of the allowance along the airfoil (i.e., by the presence of a negative allowance), since it will make it possible to transfer these blades from the category of defective to the category of suitable ones. This design solution will be relevant for 5% of blades, which today are rejected in batch production according to the criterion of the lack of uniform distribution of the allowance along the airfoil (i.e., by the presence of a negative allowance), since it will make it possible to transfer these blades from the category of defective to the category of suitable ones. [4]
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