Five-axis linkage machine tool rotation axis geometrical parameter measuring method

Abstract

The invention discloses a five-axis linkage machine tool rotation axis geometrical parameter measuring method based on a trigger-type measuring head and belongs to the field of numerical control system and machine tool structure parameter measurement. The method comprises the steps of instrument installation, parameter setting, collision acquisition and RTCP parameter calculation. Through a numerical control system, a measuring head probe is driven to collide with a standard ball and impact point machine tool coordinates are latched; ball center coordinate corresponding to each demonstration point is calculated according to the coordinates; and driving rotating shaft and driven rotating shaft axis direction and space positions are fitted for each standard ball center coordinate through a least square data processing method, and thus RTCP parameters are obtained. The method can finish automatic precise measurement of five-axis linkage machine tool rotation axis geometrical parameters (RTCP parameters), and realize rotation cutting tool central point accuracy control.

Description

technical field [0001] The invention relates to the technical field of numerical control system and machine tool structural parameter measurement, and aims to realize a method for measuring the geometric parameter of the rotary axis of a five-axis linkage machine tool. Background technique [0002] Rotary tool center control RTCP (Rotational Tool Center Point) technology is an extremely important function of the five-axis linkage CNC system. The RTCP function can directly program the trajectory of the tool center point, making the CNC program independent of the specific machine tool structure. The CNC system will automatically calculate and maintain the tool The center is always on the programmed trajectory, and the non-linear error caused by the movement of the rotary axis will be compensated by the movement of the linear axis. When the five-axis machine tool does not have the RTCP function, the tool rotates around the center of the rotary axis when the rotary axis moves, a...

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Problems solved by technology

However, in practice, the two axes are not necessarily parallel to the coordinate axes, nor are they necessarily orthogonal to each other. This measurement premise cannot be guaranteed, which will cause measurement errors

[0005] 2) The general inspection of the roundness of the baseball head and the concentricity of the center of the ball head and the axis of rotation of the spindle has low accuracy, which is not suitable for high-precision measurement occasions, resulting in errors in measurement

[0007] 4) The operation steps are cumbersome and the degree of automation is low. The quality of the measurement results often has a lot to do with the experience of the machine tool testers

[0008] In order to solve the defects of manual measurement accuracy and use limitations, maximize the automation of measurement, and realize the precise control of the center point of the rotating tool, it is necessary to seek a better measurement method

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