Five-axis solid milling efficient rough machining method of free-form surface centrifugal compressor impeller

Abstract

The invention provides a five-axis solid milling efficient rough machining method of a free-form surface centrifugal compressor impeller. The method comprises the following steps: firstly inputting blade physical model data of the free-form surface centrifugal compressor impeller into a computer, defining the free-form surface of the blade in a bi-cubic non uniform rational B-spline matrix way tobe Omega 1, extracting two free curves at the top and the root of the free-form surface Omega 1 to form a ruled surface A1, calculating the maximum space distance Delta H1 between the free-form surface Omega 1 and the ruled surface A1 and the normal vector pointing to the free-form surface Omega 1 by the ruled surface A1, ensuring that the ruled surface A1 is shifted for a distance Delta H1 alongthe direction to form a ruled surface A2, calculating a solid ruled surface blade A with thickness formed by the ruled surfaces A1 and A2, inputting splitter blade data into the computer to calculatea solid ruled surface blade SA with thickness, calculating an airflow channel to be roughly machined of the impeller, cutting a machining zone, calculating machining zones at different heights, accomplishing the calculation of a whole tool path and a cutter axis vector with a principle of the combination of a maximum radius cutter, a variable utter axis vector and a fixed utter axis vector, performing post-processing aiming at a five-axis numerical control machine, and performing practicing and machining on the five-axis numerical control machine.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and relates to a five-coordinate overall milling and high-efficiency roughing method for impellers of centrifugal compressors on free-form surfaces. Background technique [0002] As a key component, centrifugal compressors are widely used in aviation, aerospace, shipbuilding, petrochemical and other fields. The core moving equipment, the centrifugal impeller, usually compresses and transmits gas under high temperature, high pressure, and high line speed environments. Noise, vibration and other factors It is also easy to cause equipment damage. In order to ensure the quality of the impeller, reduce the impact of the deviation in the production and processing process on the performance and operation stability of the impeller as much as possible, and achieve the consistency between the design of the impeller and the actual product, the requirements for the production and manufacturing process ar...

AI Technical Summary

Problems solved by technology

However, at this stage, for the five-coordinate integral milling of complex parts such as centrifugal compressor impellers with free-form surfaces, most of the research topics focus on the finishing links such as the accuracy of the forming surface, while the research core focuses on saving CNC integral milling. Control time—especially the rough machining time is very small, resulting in the status quo of long CNC machining cycle and low efficiency

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