Measuring method of pendulum length of five-axis CNC machine tool swing

Abstract

The invention provides a cutter-shaft-swing five-coordinate numerical control machine tool pendulum length determination method. Coordinate values of a sphere center of a standard ball in the X-axis direction and the Y-axis direction of a machine coordinate system are confirmed when a swing angle of an A shape of a machine tool is theta i, and the i is 1, 2, ..., n. Variable quantity measured value and calculated value of the coordinate values of the sphere center of the standard ball in the Y-axis direction and the Z-axis direction when the swing angle of the A shaft of the machine tool is 0 degree. Then, a pendulum length parameter iteration initial value is used as an iteration codomain circle center, a machine tool spindle assembling accumulative error is used as the radius of the iteration codomain, and one tenth of processing accuracy is used as the iterative step length. Under the corresponding pendulum length parameters, n groups of variable quantity calculated values and quadratic sum of correspondence bias of the sum of the n groups of variable quantity calculated values are used as parameter indexes for judging the optimal pendulum length, and the minimum group of pendulum length parameters for judging the index values can be achieved after the iteration codomain is traversed. Compared with a general five-shaft linkage numerical control machine tool pendulum length algorithm and detection method, the method can obviously improve processing accuracy.

Description

technical field [0001] The invention relates to the technical field of numerical control machining, in particular to a method for measuring the swing length of a five-coordinate numerical control machine tool swinging by a cutter shaft. Background technique [0002] With the development of science and technology and people's pursuit of high-quality products, the shapes of product parts are becoming more and more complex, and the precision requirements are getting higher and higher. The emergence of five-axis CNC machine tools provides the necessary basic guarantee for the processing of high-precision and complex parts such as impellers, blades, and blisks. Five-coordinate machine tools are divided into: tool shaft swing type, rotary table cradle type, rotary shaft placed on the rotary table, etc. Among them, the tool shaft swing type is the most common. The pendulum length of the five-coordinate milling machine with oscillating tool shaft is defined as the distance from the...

AI Technical Summary

Problems solved by technology

However, the premise of this method is to assume that the actual rotation center of the spindle coincides with the theoretical rotation center, and does not consider the offset of the rotation axis in the direction of the two moving axes of Y and Z.

In reality, the actual center of rotation of the main shaft and the theoretical center of rotation often do not coincide precisely, resulting in large errors in the existing pendulum length measurement method

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