A method for detection and identification of the position error of the swing head of a ca double swing head five-axis CNC machine tool

Abstract

The invention discloses a CA double-swing-head five-axis numerical control machine tool swing head position error detection and identification method. The method comprises the steps: S1, using a detection instrument for measuring the comprehensive position deviation of the ball center of a ball head detection baseball at different positions of a swing head; S2, establishing a mathematical relationbetween the ball head baseball center position deviation and the position error term in combination with the property of a swing head position error term according to the kinematic model of the CA double-swing-head five-axis machine tool; S3, obtaining nine position error identification results of the swing head through an identification process based on the measurement data collected in the stepS1 and the kinematics error relational expression in the step S2; and S4, repeating the step S1 and the step S3, carrying out measurement for multiple times, and taking an average value of a positionerror identification result. According to the scheme, separation of the comprehensive position deviation value of the machine tool swing head can be effectively and rapidly completed, automatic detection and automatic identification are achieved by compiling a measurement cycle, and thus technical support is provided for accurate control and rapid evaluation of machine tool precision.

Description

technical field [0001] The invention relates to the field of error identification of a five-axis numerically controlled machine tool, in particular to a method for detecting and identifying position errors of the swing head of a CA double-oscillating head five-axis numerically controlled machine tool. Background technique [0002] Aerospace structural parts have the characteristics of large size, complex configuration, and high surface quality requirements. Large-scale bridge-type and gantry five-axis CNC machine tools are often used for large-scale parts processing. The bridge type (gantry) five-axis machine tool includes two rotary axes and three linear axes. The function of the rotary axis is to adjust the tool posture during the process stage to adapt to the complex surface shape of the aerospace structural parts, so that the five-axis machining has a high cutting rate. , less processing time and so on. [0003] However, due to the influence of the assembly accuracy of ...

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Problems solved by technology

[0005] To sum up, the detection method of swinging head error of CNC machine tools in the prior art mainly includes the following defects: the number of error items measured is low, and multiple types of error identification cannot be realized at the same time; in addition, the detection automation is low and the detection efficiency is low. Low

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