Abstract
In order to solve the problem that the flatness error contour curve of the guideway mounting surface on machine tools can not be intuitive description, a novel method is proposed in this paper. The principle is to divide the measured surface with a certain length into several short surfaces with overlapping region, and the segmented surfaces are measured respectively, then the flatness error contours of the segmented surfaces can be obtained, finally, the segmented flatness error contours are spliced together to reconstruct the flatness error contour of the entire surface. On this basis, the detection instrument is designed, the detection principle is given, the benchmark plate is customized to identify the starting position and ending position of measurement, the reference surface and the measured surface are measured respectively in combination with the detection instrument and the benchmark plate. Then, an algorithm is developed to convert the distance difference between the reference surface and the measured surface into the flatness error contours of segmented surfaces. Next, using the geometric relationship between overlapping region of segmented flatness error contours, an algorithm is studied which can splice these segmented flatness error contours and reconstruct the flatness error contour of the entire surface. Meanwhile, mathematical models of the algorithms are established, and the measurement experiment is carried out. The results demonstrate that this method can reconstruct the flatness error contour of long surface accurately.
Highlights
Accuracy of guideway mounting surfaces on machine tools is the foundation for ensuring the assembly error of the feed system [1]
The detection of domestic machine tools still use traditional methods, such as dial gauges, level gauges, flat gauges, etc. These methods have large randomness and are highly influenced by operator’s proficiency and experience, it is impossible to describe the continuous distribution of assembly errors in the feed system, and it is difficult to quantify the influence of assembly errors on the dynamic characteristics of the feed system
Considering that the laser displacement sensor has the characteristics of simple structure, high resolution and real-time recording the data [18], it was selected as the detection component, in order to reconstruct the flatness error contour of a long plane under the condition of the instrument designed in this paper, only the measurement method of piecewise stitching can be used
Summary
Accuracy of guideway mounting surfaces on machine tools is the foundation for ensuring the assembly error of the feed system [1]. Considering that the laser displacement sensor has the characteristics of simple structure, high resolution and real-time recording the data [18], it was selected as the detection component, in order to reconstruct the flatness error contour of a long plane under the condition of the instrument designed in this paper, only the measurement method of piecewise stitching can be used. The trend curves of all the space sequence measurements are extracted, which are called the detection curves of the measured surface It can be seen from Fig. that there is a relative distance difference between the measured surface and the reference surface, the separating algorithm for reference surface detection curve is developed, and the flatness error contour of each segmented surface can be obtained.
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