A Smooth Interpolation Method for Adaptive Control Bow Height Error of CNC Equipment

Abstract

A smooth interpolation method for adaptively controlling bow height errors of CNC equipment, comprising the following steps: setting or reading the maximum bow height error ε of tool path motion commands of CNC equipment; continuously inputting several segments of tool path motion commands to Interpolator, until the speed of the tool path must be reduced to 0; the speed planning is performed by the forward-looking planning control module, the starting speed and the ending speed of this section of the path are both 0, and there is no 0 speed point in the middle; statistical analysis of this section of the path The minimum radius of curvature, the motion speed at each joint point and the corresponding deflection angle of the motion direction, calculate a maximum smoothing cycle number n, so that after smooth interpolation, the bow height error between the obtained trajectory and the original trajectory is not greater than ε; smooth interpolation, a number of consecutive interpolated points are subjected to arithmetic mean or weighted average algorithm to obtain new interpolation points to reduce or eliminate motion mutations. The tool path processed by this algorithm is round and smooth, which has a significant effect on certain processing fields.

Description

technical field [0001] The invention relates to a CNC numerical control system solution. Background technique [0002] Usually, the post-processor of the CAM system decomposes the complex path into a series of small path segments (such as straight line segments or circular arc segments) according to the requirements of machining accuracy, and then the relevant interpolators in the numerical control system make a calculation for each specific small path segment. The path segments are interpolated. The quality and quality of the tool path files generated by CAM software directly affect the quality and speed of processing. Sometimes, due to the limitations of accuracy and other aspects, the tool path generated by CAM software is not perfect. Due to this tool path processing, sometimes high-quality results cannot be obtained. [0003] The method in the prior art is to use digital filtering technology to smooth the output pulses. Disadvantages of the existing technology: 1. I...

AI Technical Summary

Problems solved by technology

Disadvantages of the existing technology: 1. If it is based on smoothing the output pulse, it is equivalent to smoothing the speed, and it is difficult to ensure the accuracy of the end position; 2. It is necessary to manually set a number of smoothing cycles, and it is difficult to grasp the specific number. , and it is difficult to take into account the whole process of the tool path

The former requires technicians to have certain experience, but it still needs to be verified by trial and error processing, which is time-consuming and material-consuming

In the latter case, there is often a phenomenon of neglecting the other, and it is difficult to make the whole process just right.