One-time clamping four-shaft linkage rotary milling molding method for numerical control blade roots

Abstract

The invention provides a one-time clamping four-shaft linkage rotary milling molding method for numerical control blade roots. The method can effectively reduce the field debugging workload of workers and improve the processing efficiency; and a blade root molding cutter is not needed, so that the cutter loss is reduced and the processing cost is reduced. A four-shaft horizontal processing center is adopted, and the blade root profile processing cutter is a big spiral angle dense teeth milling cutter. The method comprises the following processing steps of: (1) setting a processing programming origin in a blade root UG model of a gas compressor; (2) calculating cutter loci of each plane and each curved surface of blade roots according to the processing programming origin, and generating a cutter location file; (3) measuring the position of the processing programming origin relative to the rotary center of a horizontal lathe on site, and obtaining values of X axis and Z axis between the two points; and (4) inputting the X-axis and Z-axis values of the on-site measured processing programming center origin relative to the rotary center of the horizontal lathe to the software of a horizontal rotary milling program conversion system, calculating an NC code file of the rotating cutter locus relative to the lathe, and performing profile processing of the blade roots of the gas compressor.

Description

technical field [0001] The invention relates to the technical field of blade numerical control machining methods, in particular to a numerical control blade root one-time clamping four-axis linkage rotary milling forming method. Background technique [0002] The machining center is a high-efficiency, high-precision CNC machine tool. The four-axis horizontal machining center is equipped with a tool magazine, which can automatically exchange machining tools. The workbench is a CNC rotary table. It can realize the processing of multiple processing surfaces. Generally, the four-axis horizontal machining center mainly processes the blade root and the total length of the blade. In actual processing, the position of the fixture on the workbench is inconsistent each time (see figure 1 ), and the center 1 of the programmed NC program does not coincide with the center of rotation 2 of the worktable 3. Generally, the processing of the product can only be completed by combining the adj...

AI Technical Summary

Problems solved by technology

The blade root of the compressor blade is a dovetail tenon structure, and its inner and back working surfaces are not parallel and form an included angle. Although the blade root forming knife is used (see figure 2 ) directly processing the blade root profile can reduce the workload of workers on-site debugging and achieve one-time clamping processing, but the tool wear is large during processing, the processing cost is high, and the surface roughness of the blade root is poor

In order to improve the precision of the working face, a large helix angle dense tooth milling cutter φ32 (face grinding R, image 3 ) finish milling face, the workpiece needs to be processed at a rotation angle during finish milling. Although the machine tool can rotate at any angle, because the programming origin of the blade installed in the fixture does not coincide with the rotation center of the machine tool, there is a deviation value, and each installation The positions of the fixtures are also different, and the deviation value is changed every time a batch of blades are processed, and due to the existence of the deviation value, the actual machining position is inconsistent with the tool track coordinate points in the NC program, so that workers need to do a lot of on-site work before processing. Debugging, the processing efficiency is low, and the quality of the processed blade root surface cannot be guaranteed. 6 is the end face of the square box, 7 is the programming origin, and 8 is the centerline of the blade root

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