Method for processing integral impeller by using four-axis numerical-control milling machine

Abstract

The invention discloses a method for processing an integral impeller by using a four-axis numerical-control milling machine. The method is high in cutting efficiency, helps to reduce processing cost, shorten processing time and simplify the number of movement shafts participating linkage when four-axis processing is performed. The method is realized through the following technical scheme: employing a lead reference line projection revolution processing manner in programming, so as to enable a milling cutter to perform multi-axis linked milling processing along with the impeller lead curvature change, and using a fixed-axis manner to arrange the cutter axis to be perpendicular to the processing path direction, so as to enable cutter path direction to superposed with the impeller revolution-shaft axial lead and generate a four-axis milling machine multi-axis linked processing digital control program; fixedly disposing an impeller part at the revolution shaft A center of the four-axis milling machine, calculating out the tapered angle of an impeller blade according to the lead and the diameter of the impeller, blade thickness and other parameters, arranging the processing direction of the tapered flat-bottom milling cutter to be X direction of the milling machine revolution shaft, and unchanging the revolution shaft axis position along Y direction during processing; and controlling the milling cutter to perform multi-axis linked milling processing along with the impeller lead curvature change.

Description

technical field [0001] The invention relates to a numerically controlled milling method for machining integral impellers with a four-axis numerically controlled milling machine. Background technique [0002] The integral impeller refers to the design of the blade and disc of the traditional impeller structure into an integral structure. Due to the complex blade shape, the overall impeller requires high precision and poor accessibility of tool processing. The blades are thin, with large twists, small blade intervals, and large deformation after the blades are thin; the impeller materials are mostly difficult-to-machine materials with high temperature resistance and high specific strength and stiffness, so the processing and manufacturing of the overall impeller is difficult. The overall impeller is composed of a hub and a number of blades. The blades are evenly distributed on the surface of the hub. The space formed by two adjacent blades and the hub surface is a flow channe...

AI Technical Summary

Problems solved by technology

However, the traditional method of processing the impeller on a four-axis machine tool is often processed with a ball-nose taper end mill, which uses a ball-nose end mill for spot cutting, which not only has low processing efficiency, but also has poor consistency of the processed surface and serious surface hardening.

Moreover, the impeller is processed by a tool with a fixed taper, which does not take into account the change of the curved surface of different impellers. The machining surface is a convex curve along the direction of the tool, and the tool contact track is a concave curve. The machining error is relatively large. It finally generates a four-axis linkage. In this way, due to the excessive number of linkage machining axes, the tool bears a large cutting force, which in turn causes excessive machining vibration, reduces the surface quality of the machined parts, poor finish, large tool marks, and the ball end milling cutter It is not suitable for large margin cutting, and its chip removal ability is poor, which makes it difficult to increase the cutting speed and result in low processing efficiency

Therefore, the surface quality of the parts in the processing of the impeller curved surface by the traditional four-axis machine tool processing method is not ideal, and the advantages of the four-axis machine tool for processing impeller curved surface parts are not fully utilized.

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