A modeling method for a blade tip process extension section of a rotor blade forge piece

Abstract

The invention discloses a modeling method for a blade tip process extension section of a rotor blade forging. The modeling method comprises the following steps: 1, analyzing blade body molded line data; 2, calculating a middle arc line; 3, making a trend control line in the blade spreading direction; 4, calculating a mean camber line of the extension section; 5, calculating blade basins and bladeback molded lines of the three control lines of the extension section; And 6, smoothing each section molded line. According to the modeling method for the extension section of the blade body of the precision forging blade without allowance design, the profile tolerance, the torsion angle and the bending of the tip part of the blade and the blade spreading waviness of the whole blade body can be better guaranteed.

Description

Technical field [0001] The invention relates to the forging design of the rotor blade of an aero-engine compressor, in particular to the design of the blade tip extension section. Background technique [0002] The blade tip extension section of the rotor blade forging raw material is based on the structural characteristics of the blade design. In order to meet the requirements of the forging process, the technological positioning journal is placed, and the part that extends 10mm to 20mm at the blade tip according to the blade shape trend. The blade forging is shown in the figure figure 1 shown. [0003] At present, most of the blade forging drawings are designed with the three-dimensional drawing software UG. When dealing with the blade tip extension section, the blade tip section is copied upwards by 10mm to 20mm, and then the copied section is translated and rotated according to the trend, and finally the "passing curve Group" command to get the leaf body entity. This me...

AI Technical Summary

Problems solved by technology

This method will cause the transition of the extension section to be unsmooth, which will mainly affect the blade in three aspects: 1. The positioning point K3 of the tip section has a large fitting error, which affects the positioning accuracy of the subsequent machining of the blade; 2. At the tip section There is stress concentration, the rebound deformation of the forging is large after forging, and the contour, torsion angle and bending of several sections near the tip are not easy to guarantee; 3. It affects the fluidity of the metal, and there is stress concentration at the transfer point, which in turn affects the life of the die

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