Method for intelligent position finding and online measurement of large-dimension cam non-circular grinding

Abstract

The invention relates to a method for intelligent position finding and online measurement of non-circular cam grinding large-dimension. The method utilizes visual sensing technology to acquire an image of a laser ray on the cam within each sampling period through a computer-controlled image acquisition system, calculates coordinates of points on a corresponding cam profile after pretreatment, canobtain the coordinates of a plurality of points on the cam profile on the current assembly position after the cam is rotated for a circle, and obtain an actual cam profile curve. The method can obtainoptimum cam processing zero position and accurate cam profile error through treatment by 'a sensitive point method' according to the principle of 'minimum condition'. The method avoids high requirement of a radial displacement sensor on the range, ensures that a measuring device has a simple structure, is convenient for the intelligent position finding and online measurement of cam non-circular grinding, and improves the processing efficiency and the processing precision of cam non-circular grinding.

Description

technical field [0001] The invention relates to an intelligent position finding and online measuring method for cam noncircular grinding. Background technique [0002] The so-called non-circular grinding is C-X synchronous grinding technology, which is a tracking grinding technology newly developed by developed countries in recent years. A technology of grinding with automatic tracking. Cam non-circular grinding process such as figure 1 shown. Its motion model takes the design zero point of the cam as the initial angle, but the starting position of the clamp during grinding is random and arbitrary, and there are also problems such as uneven blank allowance, which will cause the actual zero point during grinding to be not designed Theoretical zero point, thus causing the dimensional accuracy of the cam workpiece to be out of tolerance, or even scrapped. In the traditional cam grinding process, especially in the process of single piece and small batch production, the zero ...

AI Technical Summary

Problems solved by technology

This kind of special measuring instrument is usually used to detect the machining error of the final product, and its measuring range is very small. For the semi-finished product in the process of processing, the error and surface roughness may be large, so it is not suitable to use this special high-precision measuring instrument. Measuring instrument to detect

Moreover, the off-line measurement makes the design basis, processing basis and measurement basis of the cam irrelevant to each other, which is not good for the final guarantee of the processing quality of the cam.

In the previous research, the applicant had proposed a method of controlling the measurement process through auxiliary mechanisms such as displacement sensors and rotary cylinders according to the cam non-circular grinding motion model, so that the measuring head is always in contact with the workpiece, and the method of online cam profile positioning and measurement is performed, but the experiment shows that : The positioning and detection accuracy of this method cannot meet the previous requirements, and the contact measurement scheme has the disadvantage that the measuring head is easy to wear

Therefore, how to realize fast change and contour detection in cam non-circular grinding has become a bottleneck problem that limits the efficiency and processing quality of cam non-circular grinding

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