Device for displaying a moving locus

Abstract

A device for displaying a moving locus in which a moving body is supported at its both ends by a pair of feed axes of a tandem structure so as to move in a opposite direction of the pair of feed axes, and has a point where a position is to be controlled at an internally dividing point to divide a distance between the pair of feed axes into a predetermined ratio, and the moving locus of the point where the position is to be controlled is drawn, the device having a data storage portion for storing a first position data and second position data of the moving body detected on the pair of feed axes when the pair of feed axes are driven maintaining synchronization; a data calculating portion for calculating a third position data of the point where the position is to be controlled from the first position data and second position data on the pair of feed axes stored in the data storage portion; and a locus display portion for drawing the moving locus of a point where the position is to be controlled based on the third position data calculated by the data calculating portion.

Description

technical field [0001] The present invention relates to an object of position control of a moving body arranged on a pair of feed shafts in a cascade structure, which is applied to industrial machines such as machine tools driven by servo motors, electric presses, injection molding machines, and punching machines. A moving track display device for displaying the moving track of a point. Background technique [0002] Generally, as an example of a movement trajectory display device and a movement trajectory display method for displaying a movement trajectory of a position control target point of a movable body such as a workpiece table or a tool rest arranged on a feed axis, JP-A-2005-189215 The movement track display device and the movement track display method disclosed in the gazette. This gazette discloses a method of calculating a predetermined data sequence as time-series data associated with time by performing calculations among data acquired in a plurality of channels...

AI Technical Summary

Problems solved by technology

However, in this cascade control, the main motor and the sub-motors are synchronously controlled, but there is a slight difference in the positions of the feed shaft on the master side and the feed shaft on the slave side due to a certain degree of difference. The problem of synchronous error between feed axes

In such a case, when the position control target point of the moving body is between a pair of feed axes, the position control target point becomes neither the position of the feed axis on the master side nor the position of the feed axis on the slave side. Therefore, there is a problem that the position control object point cannot be correctly calculated

[0005] The method disclosed in Japanese Unexamined Patent Application Publication No. 2005-189215 is a method of calculating a predetermined data sequence from data obtained in a plurality of channels, and is not a method of processing data that cannot be obtained in a predetermined channel such as the above-mentioned position control target point , therefore, there is a problem that the movement trajectory of the position control object point of the moving body existing between a pair of feed axes cannot be displayed correctly

For example, when the moving body is a tool holder that can move in two-dimensional directions, and the cutting edge of a cutting tool fixed on the tool holder is used as a position control target point, it becomes the material to be cut by the cutting edge of the tool. As a result of the difference between the actual machining outline and the movement path displayed on the display device of the machine tool, there is a concern that the size and shape of the processed product cannot be correctly evaluated.

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