A Turning Method for Compensating Shape Errors of Rotary Parts

Abstract

The invention discloses a rotational part turning machining method capable of compensating shape errors. The rotational part turning machining method comprises the steps that after a rotational part is subjected to rough machining, the coordinate of the intersection point of two adjacent profile line segments of the rotational part is measured, and rough machining allowances in the X and Z directions are obtained; the semifinishing track is determined according to the rough machining allowances, semifinishing is conducted on the rotational part subjected to rough machining, then, the coordinate of the intersection point of two adjacent profile line segments of the rotational part subjected to semifinishing is measured, and the magnitude of the errors of semifinishing the X and Z directions is obtained; and finish machining is conducted on the rotational part subjected to semifinishing, in the finish machining process, the magnitude of the errors of semifinishing is compensated through a lathe so that a finish machining track can be determined, and the online detection self-adaptive turning machining method for the large-size rotational part is achieved. According to the rotational part turning machining method capable of compensating the shape errors, by measuring the size of the part in the machining process, machining comprehensive errors caused by tool abrasion, part clamping, uneven hardness and other elements are eliminated, and the machining precision of the large-size rotational part is substantially improved.

Description

technical field [0001] The invention relates to the field of numerical control turning, in particular to a method for turning parts of a revolving body capable of compensating for shape errors. Background technique [0002] When large rotary parts are processed on lathes, tool wear problems are often encountered. Specifically, under the feed rate of each revolution, the cutting length of the tool is one turn. After the cross-sectional profile of the part is processed, the cutting length of the part is πDL / s (wherein, D is the turning diameter, L is the length of the cutting section, and s is Feed per revolution), it can be seen from the formula that the larger the diameter of the part, the longer the required cutting length. On the other hand, it can be seen in actual processing that the problem of cutting tool wear is particularly prominent in the processing of large parts. For a rotary part with a diameter of 450 mm and a length of 2000 mm, the diameter difference between...

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Problems solved by technology

[0005] However, since the detection can only be performed perpendicular to the axis, the detection error of this method is small when the angle between the oblique line of the detection section and the axis or the curvature angle between the curve and the axis is small. When the angle is large, the error is very large, and it cannot be detected safely when the contour is perpendicular to the axis. Therefore, the application of the above-mentioned adaptive compensation method has great limitations, making it difficult to solve the machining error caused by tool wear during the machining process. still

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