Machining method for large-size axial flow type integral impeller

Abstract

The invention aims to provide a machining method for a large-size axial flow type integral impeller. The machining method is characterized by adopting an open type and close type impeller combined machining method to machine, wherein an open type partial milling method of the impeller comprises the steps of carrying out open type impeller rough slotting in a blade overlapping shaft direction and carrying out finish-milling machining by spirally milling; a closed type partial milling method of the impeller comprises the steps of roughly slotting along the axis direction of an engine and carrying out reciprocating type finish-milling machining; namely, the front half section of a blade profile is subjected to slotting and spiral milling, and the back half section to a blade root of the blade profile are subjected to butt joint slotting and reciprocating type milling. According to the method, the machining efficiency of the large-size axial flow type integral impeller can be improved, the surface quality of a blade part is improved and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of mechanical manufacturing, and particularly provides a novel processing method for a large axial-flow integral impeller. Background technique [0002] With the improvement of thrust-to-weight ratio requirements of aero-engines, the application of large-scale axial-flow integral impellers is becoming more and more extensive. Although large-scale axial-flow integral impellers are open structures, due to the large blade size, the maximum length of the blade is about 300mm, and the maximum width of the impeller is about 300mm. 219mm, maximum torsion angle 62°, easily deformed by force, poor openness, is a typical wide chord, large torsion angle, long cantilever, narrow deep cavity structure, its CNC milling process is very difficult, the processing characteristics are: processing The length-to-diameter ratio of the tool is large (for example, if the single-side milling process of the open blisk is conventionally used, t...

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Problems solved by technology

[0002] With the improvement of thrust-to-weight ratio requirements of aero-engines, the application of large-scale axial-flow integral impellers is becoming more and more extensive. Although large-scale axial-flow integral impellers are open structures, due to the large blade size, the maximum length of the blade is about 300mm, and the maximum width of the impeller is about 300mm. 219mm, maximum torsion angle 62°, easily deformed by force, poor openness, is a typical wide chord, large torsion angle, long cantilever, narrow deep cavity structure, its CNC milling process is very difficult, the processing characteristics are: processing The length-to-diameter ratio of the tool is large (for example, if the single-side milling process of the open blisk is conventionally used, the milling tool can be as long as 350mm), the coupling vibration of the blade cantilever and the tool is extremely serious during the processing, and the large torsion angle and narrow depth The cavity structure causes severe interference of the machining tool and a sharp reduction in the tool diameter, and at the same time indirectly increases the tool length-to-diameter ratio

With the sharp increase of tool length-to-diameter ratio, the coupled vibration between the tool and the cantilever of the blade seriously reduces the milling quality of the blade surface and reduces the processing efficiency. Direct increase in tool costs

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