Circumferential fixed-width cutting path planning method for rough machining of integrated impeller

Abstract

The invention discloses a circumferential fixed-width cutting path planning method for the rough machining of an integrated impeller. The method comprises the following steps: generating a tool path source file of an axial cutting tool path, and analyzing position coordinates and a tool axis vector of each tool position point; equally dividing the axial cutting tool path into delta according to an axial width; interpolating circumferential cutting tool paths between the corresponding equal dividing tool position points on the axial cutting tool path; calculating a tool position point top rake tendency of each circumferential cutting tool path, and determining feeding points and retraction points on the basis of the tool position point top rake tendencies; interpolating a lowering point and a lifting point of each circumferential cutting tool path; interpolating a connecting tool path between every two adjacent circumferential cutting tool paths; connecting the axial cutting tool path with each circumferential cutting tool path to obtain an integrated cutting path according to a cutting sequence. According to the planning method, by the cutting path for the rough machining of the integrated impeller, the phenomenon of tool path redundancy is avoided, high effective cutting rate is achieved, a cutting tool is kept in a positive top rake cutting state most of the time, abrasion can be effectively reduced, and the cutting tool can be protected.

Description

technical field [0001] The invention belongs to the field of multi-axis linkage numerical control machining, and more specifically relates to a planning method for a circumferential fixed-cut width tool path for rough machining of an integral impeller. Background technique [0002] Compared with the impeller with assembled structure, the integral impeller has the advantages of simple structure, good heat transfer performance, high reliability and light weight, so it is widely used in various high-performance aero-engines. It is complex and difficult to process. Therefore, although multi-axis linkage CNC machine tools can be used for processing at present, the processing quality is poor, the efficiency is low, and the processing cost is high, which seriously restricts the use of the overall impeller. The processing of the integral impeller generally includes the stages of rough forging, rough machining, finishing, polishing, etc., among which the amount of material removal in...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at providing a new overall impeller rough machining circumferential orientation method for the defects and deficiencies existing in the planning method of the overall impeller rough machining tool path, such as redundant tool paths, low processing efficiency, and poor cutting state of the tool. The planning method of the wide cutting tool path adopts circumferential continuous cutting tool, which avoids redundant tool paths, significantly improves the rough machining efficiency of the overall impeller, and keeps the tool in a positive forward cutting state most of the time, reducing tool wear. Extended tool life with good overall roughing effect

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