Zoning cutting-based five-axis milling method of centrifugal compressor impeller

Abstract

The invention discloses a zoning cutting-based five-axis milling method of a centrifugal compressor impeller. The method comprises the following steps: inputting entity model data into a computer to complete the molding of an original centrifugal compressor impeller; defining a blade S(u, v) and a short blade Ss(u, v) in bi-cubic non uniform rational B-spline matrix form values; extracting the front edge line of the short blade and partitioning the blade S(u, v) into front and back parts Sl(u, v) and St(u, v), so as to obtain three sub machining zones; intelligently calculating the maximum diameter D1 of a cutter, selecting a cutter with circular angles and flat bottom as a milling cutter, and calculating the machining bandwidth of a rough milling stage; in the rough milling stage, planning the cutter position path with a triangle simulated method and calculating the cutter axis vector with a stationary cutter axis vector cutting algorithm; in the fine milling stage, smoothly linking the independently calculated cutter position paths of different machining zones, so as to realize fine milling of a runner; and finally, performing post-processing on the calculated cutter position paths and cutter axis vectors according to a used five-axis numerical control machine and performing practical machining on the five-axis numerical control machine.

Description

Technical field: [0001] The invention belongs to the field of mechanical processing, and in particular relates to a five-coordinate milling method of a centrifugal compressor impeller based on subregional cutting. Background technique: [0002] Centrifugal compressor impellers, as the core components of high-performance turbine impellers, are widely used in aerospace, automotive, shipbuilding, petrochemical and other fields. The level of manufacturing technology of these products is an important indicator of a country's manufacturing capabilities. Five-coordinate CNC precision cutting is currently a mainstream process for machining impellers of centrifugal compressors. [0003] The space-twisted blades of the centrifugal compressor wheel can control the streamline trajectory in the entire impeller flow path, which has extremely high aerodynamic characteristics. From the perspective of five-axis CNC precision cutting, the characteristics of centrifugal compressor impellers ...

AI Technical Summary

Problems solved by technology

However, this method only simply divides the processing area, and does not consider the extraction of cutting features of each area, the solution of different cutting features, the connection of tool position trajectories between each area, and the efficient forming of airflow channels, etc., resulting in messy machining trajectories. , The cutting efficiency is low, it is only an initial stage attempt

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