Cutter path generating method for double blade head processing of turbine long blade profile

Abstract

The invention discloses a cutter path generating method for double blade head processing of a turbine long blade profile. The method comprises the following steps: firstly establishing a corresponding mathematical relation between cutting force and cutter shaft inclinations during blade processing so as to obtain a cutting force model of the blade processing; then acquiring section moulded line data of a blade, and determining the range of cutter location control point data of double blades in the section moulded lines of the blade, wherein the cutter location control point data comprise the step length between cutter location control points, the number of the cutter location control points and the cutter shaft inclination of a cutter at each corresponding cutter location control point; and finally determining the final offset effect of the cutting force. In the invention, the double blade head can simultaneously process parts, and the processing efficiency is obviously improved compared with a single blade by reasonably scheduling the processing technique on the parts; and besides, the double blade processing can ensure the cutting force to be greatly offset, thus the processing deformation of the parts is obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and relates to the processing of long blade profiles of steam turbines, in particular to a method for generating tool tracks for double-cutter machining of long blade profiles of steam turbines. Background technique [0002] Steam turbine blades are generally composed of blade roots, blade body, shrouds, tie bars and transition parts. The root of the blade is the fixed part of the blade, and the body of the blade is the part of the blade with the blade shape. The quality of the blade shape directly determines the working quality of the blade and the performance of the steam turbine. The working environment of the blade is harsh, and it bears the centrifugal force brought by high temperature, high pressure and high speed and the corrosion of high temperature steam. In order to ensure the performance of the steam turbine and the safety of the equipment, the material of the steam turb...

AI Technical Summary

Problems solved by technology

If the method of generating the tool path with a single tool is used to determine the tool position control point data of the double-knife machining, although the geometric error requirements can be met, the corresponding relationship between the tools on both sides cannot be determined, and the advantages of the double-knife machining cannot be reflected.

[0011] The general tool path generation methods only meet the requirements of machining error from the perspective of geometric relationship, but do not take into account the influence of tool path on cutting force

Most of the methods that consider the influence of cutting force only improve the influence of cutting force by changing the feed rate, and do not control the cutting force from the perspective of generating tool position control point data.

When the tool path is generated by double-knife machining, if the influence of the cutting force is not considered, the offset effect of the cutting force of the generated tool path may not be ideal. If it is not considered properly, it may even increase the possibility of blade machining deformation

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