Finish-milling feeding speed optimizing method based on integral impeller blade shape

Abstract

The invention discloses a finish-milling feeding speed optimizing method based on integral impeller blade shape. The method comprises the steps of generating a finish-machining cutter track source file of a spherical head cutter blade with the radius as RT and based on a spherical head according to a geometrical shape of an integral impeller blade, introducing a single impeller blade model, judging the cross line between a runner and the blade according to the distance between a point on the blade and the center of an impeller, extracting the cross line, discreting the cross line into W points according to equal chord heights, composing a point set U through W points, setting the longitudinal depth acceleration proportion omega between the top end of the blade and the tail end of the blade, sequentially reading and analyzing the cutter track source file generated in the step 1 line by line, and extracting cutter point information of all cutting paths in the cutter track source file generated in the step 1. In addition, the cutter track source file records cutter point coordinates under a processing coordinate system and cutter axis vectors corresponding to the cutter point coordinates. The finish-milling feeding speed optimizing method solves the technical problems that an existing method is low in processing efficiency, poor in processing quality and serious in cutter abrasion.

Description

technical field [0001] The invention belongs to the field of multi-axis linkage numerical control machining, and more specifically relates to a precision milling variable feed speed optimization method based on the shape of an integral impeller blade. Background technique [0002] As a high-performance complex surface part, the integral impeller is mainly manufactured by multi-axis linkage CNC machining. The complexity of its geometric structure and surface shape leads to the use of special tools, process optimization, NC programming and machine tool motion planning for such parts during multi-axis machining. The link is very complicated, which seriously restricts the quality and efficiency of multi-axis CNC machining, as well as the high cost. As a result, the processing capacity of these key basic parts is far from meeting the needs of major national projects. [0003] At present, in the field of multi-axis simultaneous machining of high-performance complex surfaces, the ...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a method for optimizing the feed speed of fine milling based on the shape of the overall impeller blade. The feed of the tool position trajectory in finishing milling is optimized, so as to overcome the technical problems of low processing efficiency, poor processing quality and serious tool wear in the existing methods

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