Method for acquiring stability lobe graph by utilizing full-discrete method

Abstract

The invention belongs to the field of stability prediction of a milling system, and discloses a method for acquiring a stability lobe graph by utilizing a full-discrete method. The method comprises the following steps that a, a maximum characteristic value absolute value relational expression of a state transfer matrix is acquired; b, a coordinate system of the rotating speed of a main shaft and the cutting depth is established, and the coordinate system is rasterized; c, an initial boundary point is searched for by means of dichotomy; d, a previous boundary point is translated into a grid toobtain a new point, a searching direction and a searching area are determined according to the size of the maximum characteristic value absolute value of the point until a boundary point is found; e,step d is repeated until boundary points of all the areas are obtained, and the boundary points are sequentially connected in the horizontal coordinate direction to form a lobe curve. By means of themethod, drawing of the lobe graph only relates to stability calculation of a few points near the lobe curve, which is similar to the situation that calculation is carried out along with the boundary of the stability, and then the stability lobe graph is quickly drawn in a two-dimensional coordinate system formed by the rotating speed and the cutting depth.

Description

technical field [0001] The invention belongs to the field of stability prediction of a milling system, and more particularly relates to a method for obtaining a stability lobe diagram by using a full discrete method. Background technique [0002] With the rapid development of industrial automation and intelligence, milling processing technology is more and more used in the manufacturing process of large and complex curved surface parts such as marine propellers, aeroengine blades and rocket wall tubes. It is the key to obtaining high-precision processing quality One of the important basic technologies. [0003] In actual production, there is a possibility that the selection of processing parameters is unreasonable, so that the milling system of the machine will vibrate during the milling process. It is a severe vibration phenomenon of self-excited vibration, which will not only reduce the processing efficiency and affect the quality of the processed surface , and will signi...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for obtaining the stability lobe map by using the full discretization method, by discretizing the horizontal and vertical coordinates to obtain multiple discrete points, and drawing the required The lobe line is discretized into multiple straight lines, and the search direction is determined according to the characteristics of the lobe curve to reduce the search range, thereby solving the technical problems of low precision and time-consuming drawing of the stability lobe map

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