Automatic positioning of cam non-circular grinding and on-line measurement method and apparatus

Abstract

The invention relates to a method for automatic positioning and online measurement of cam non-circular grinding, and a device thereof. The method controls an X-axis of a grinding carriage to track a C-axis of a head stock through a cam non-circular grinding motion model by high precision movement performance of C-axis and X-axis of a numerical control non-circular grinder and position data fed back from a position measurement device of the machine, keeps a gauge head of a radial displacement sensor contacted with a workpiece so as to make up the deficiency of a measuring range of the radial sensor by the motion of the grinding carriage. Coordinate figures of the C-axis and the X-axis of the machine tool and reading of the radial displacement sensor are acquired according to time sequence, the three groups of data are processed by 'sensitivity points method' according to the 'minimal condition' principle so as to obtain an optimal cam processing zero position and accurate cam profile error. The method greatly reduces the requirement on the measuring range of the radial displacement sensor to ensure a compact structure for the measuring device, thereby facilitating the online measurement and automatic positioning, and ensuring the processing efficiency and processing precision of cam non-circular grinding.

Description

technical field [0001] The invention relates to an automatic positioning and on-line measuring method and device 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 technique of command follow-up tracking for grinding. 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...

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.

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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