Radial direction milling method of thin wall blade edge head curved face

Abstract

The invention discloses a radial milling method for an edge head curved surface of a thin walled vane. At first, three-dimensional modeling is carried out on the thin walled vane to be processed, the processing coordinate system of the three-dimensional model of the thin walled vane is adjusted, a vane basin curved surface, a vane back curved surface, a front edge curved surface and a back edge curved surface are respectively extracted, effective processing regions are divided on the vane curved surface and contact point track is designed on the vane basin curved surface and the vane back curved surface, thus obtaining a contact point trajectory covering the whole processing region. Then a non-uniform B sampling curve that connects the trajectory of the vane basin cutter location and the trajectory of the vane back cutter location is constructed on the front edge and the back edge of the vane, and the corresponding cutter-axis vector and the cutter location are calculated. As only the vane basin curved surface and the vane back curved surface are involved in the cutting in the processing process, the front edge curved surface and the back edge curved surface are processed separately, thus avoiding over-cutting caused by intensive cutter locations on the front edge and the back edge and violent change of the cutter-axis vector. The processing precision can be improved to 0.05 to 0.10mm from 0.24 to 0.60mm of the prior art, and the processing efficiency can be improved at the same time.

Description

technical field [0001] The invention relates to a radial milling method for the edge head area in the helical machining of thin-walled blades. Background technique [0002] Thin-walled blades are widely used in aviation, shipbuilding and other fields. They have the technical characteristics of complex surface structure, thin-walled and difficult-to-machine materials, which are easy to cause processing deformation. The spiral machining method belongs to symmetrical machining, the stress release is uniform during the machining process, and the machining deformation is small. It is an ideal multi-axis machining method for blades. However, the existing spiral processing method is easy to cause overcut in the blade edge area, resulting in low processing efficiency and poor processing quality. [0003] The literature "Research on four-coordinate high-efficiency spiral NC programming method for blade parts, Mechanical Science and Technology, Bai Yu, Zhang Dinghua, etc., 200322(2):...

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Problems solved by technology

[0004] In order to overcome the disadvantages of low machining accuracy in the prior art, the present invention provides a milling method for edge head curved surface in spiral machining of thin-walled blades. In this method, only the curved surface of the blade basin and the curved surface of the blade back participate in the cutting during the spiral milling process of the thin-walled blade. , the edge head surface is stripped from the helical machining process and processed separately by milling along the rotor radius of the blade, so that efficient and precise CNC machining of thin-walled blades can be achieved

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