Multi-axis curved surface type numerically-controlled method for machining complicated curved surface part

Abstract

The invention discloses a multi-axis curved surface type numerically-controlled method for machining a complicated curved surface part. According to the method disclosed by the invention, the axis of a cutter can be arranged according to the directions of longitude and latitude normal lines for forming a curved surface, an inclined angle is adjusted to generate a cutter path, and the machining efficiency and the part surface smoothness can be improved. The numerically-controlled method can be realized by the following technical scheme: a part is fixed in a rotary center of a five-shaft machine tool; a curved surface is reconstructed according to the curvature change, the normal line direction of the curved surface and a machining path; a space change of an axis vector of the cutter is controlled by adjusting the front inclined angle and the side inclined angle of a cutter shaft of a flat-bottom end mill so that the cutter always keeps that a cutter tip participates in curved surface cutting in the five-axis continuous cutting process; a curved surface projection machining manner is adopted in the programming process so that the mill can carry out multi-axis linked milling machining according to the curvature change of the curved surface; the axis of the cutter is similar with a relatively small front inclined angle alpha overlapped to the normal line direction of the cutter path and a side inclined angle is set as 0; the axis of the cutter is kept vertical to the direction of the machining path to implement a five-axis linked machining numerical control procedure.

Description

technical field [0001] The invention relates to a five-axis CNC machining method for complex curved surface parts using a five-axis linkage machine tool. Background technique [0002] The key of the five-axis machining technology is to control the constant change of the tool axis vector in the spatial position or make the tool axis vector and the original coordinate system of the machine tool form a certain angle in space, and use the side edge or bottom edge of the milling cutter to complete the cutting process. Axis linkage machining generates a machining program by taking advantage of the continuous change of the tool axis vector of the five-axis machine tool and controlling the change of the tool axis vector in space. The tool axis vector change is realized by swinging the table or the spindle . [0003] In Chinese Patent No. 201210077874.8, the description and Figure 4 In this method, the edge, rib or web parts of complex curved surfaces are clamped and fixed on the C...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the disadvantages that the curvature of the curved surface of complex curved surface parts is constantly changing, the center part of the tool participates in the cutting line speed is low, the cutting force is large, the chip removal is not smooth, the surface of the processing is large, the finish is poor, and the processing quality is not ideal. , to provide a tool with high cutting efficiency, the bottom plane of the tool and the tangent direction of the curved surface are nearly coincident, the spacing between the cutting tools is large, and the residual allowance is small, so that the tool axis can be adjusted according to the normal direction of the latitude and longitude of the curved surface to generate the tool path. Method for machining complex curved surface parts by multi-axis curved surface numerical control capable of improving processing efficiency and surface finish of parts

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