JPH01281854A - Straightness compensating device - Google Patents

Abstract

PURPOSE:To obtain a device for compensating the inclination of a spindle due to a straightness error by constituting so that the inclination of the spindle can be compensated by providing an inclination compensating mechanism being driven by a magnetostrictive element that operates in response to the output of an inclnation detector. CONSTITUTION:If there is an error in the straightness of Y axis 3, an inclination theta2 from the horizontal angle is caused in a Z-axis support mechanism 8. Then, this inclination is detected by an inclination detector 9 having been fitted on a main spindle 5, and it is so contrived that the main spindle 5 is pivotally fitted to the Z-axis support mechanism 8 so as to be turnable to the horizon around a fulcrum 15, and that a magnetostrictive element 10 is fitted between the main spindle 5 and the Z-axis support mechanism 8 as a driving source so as to be a compensating mechanism for compensating the inclination to the horizon. And the magnetostrictive element 10 is displaced in response to the output of the inclination detector 9, so that the main spindle 5 is tilted around the fulcrum 15. Thus, the inclination of the main spindle 5 can be always maintained at a reference inclination theta0 making the center of the fulcrum 15. In other words, the inclination of Z-axis 4 attributable to the straightness error of Y-axis 3 can be compensated.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Denominator> The present invention relates to an example of a machine tool or a device for correcting the inclination of an axis caused by a straightness error of a moving axis.

<Prior Art> In machine tools, errors in the straightness of the axes occur due to thermal displacement or misalignment of the installation foundation, and each axis may tilt due to this straightness error.

For example, as shown in Fig. 2, when drilling a polling hole 2 in a workpiece 1 using a side boring machine, if there is a straightness error in the Y-axis 3, the inclination of the Z-axis 4 will be at position A on the Y-axis, Varies depending on B. Therefore, when polling holes are machined in the Z-axis direction in this state, the polling holes 2 and 2 are formed at positions A and B.
There was a problem that the axial directions of the two did not match. Second
In the figure, 5 is the main axis, 6 is the column, and 7 is the bed.

<Problems to be Solved by the Invention> Conventionally, there has been no suitable means for correcting the inclination of the shaft caused by straightness errors.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a device for correcting the inclination of an axis due to a straightness error.

Means for Solving the Problems> A straightness correction device according to the present invention includes: a tilt detector for detecting the tilt of an axis caused by a straightness error of a moving axis in a machine tool; It is configured to include a tilt correction mechanism driven by a magnetostrictive element that operates according to the output of the tilt detector, and to correct the tilt of the axis.

Effect> The magnetostrictive element causes a volume change according to the output of the tilt detector,
The tilt correction mechanism operates using this volume change as a driving source to correct the tilt of the shaft.

Example of implementation An embodiment of the present invention will be described based on FIG.

The embodiment shown in FIG. 1 is an example of a straightness correction device for a case where there is a straightness error in the Y-axis 3 of a machine tool, such as a tank boring machine.

In FIG. 1, the main shaft 5 is supported by a Z-axis support mechanism 8 and is mounted so as to be movable along the Y-axis 4. 6 is a column.

At this time, if there is an error in the straightness of the Y-axis 3, the Z-axis support mechanism 8 will be tilted by 02 from the horizontal angle (θ.=0 degree) in the example shown in FIG. Conventionally, the main shaft 5 would also be tilted by θ2.

Therefore, this tilt with respect to the horizontal is detected by a tilt detector 9 attached to the main shaft 5. In addition, the main shaft 5 is pivotally connected to the Z-axis support mechanism 8 with a pin, a hinge, etc., so that it can rotate horizontally about a fulcrum 15, and a magnetostrictive element 10 is also provided between the main shaft 5 and the Z-axis port mechanism 8. It is installed as a driving source and serves as a horizontal tilt correction mechanism. The magnetostrictive element 10 is subjected to magnetostrictive displacement in the direction of the arrow 12, and is wound with a coil 11 to generate a magnetic field.

Further, in order to drive the magnetostrictive element 10, the output of the tilt detector 9 is given to a tilt/current converter 13. The slope/current converter 13 calculates the detected slope 7 and the reference slope θ set in the reference slope setting device 14. The difference between θ2 and θ. The current is generated according to the angle. This current is passed through the magnetostrictive element 1
A magnetic field is generated through the coil 11 of magnetostrictive element lO.
is displaced in the magnetostrictive displacement direction 12 (elongation m) in proportion to the strength of the magnetic field.
), the main shaft 5 is moved around the fulcrum 15 by the Z-axis support mechanism 8.
Tilt against. As a result, the inclination of the main shaft 5 is always the reference inclination θ with the fulcrum 15 as the rotation center. is maintained. That is,
It should be possible to correct the inclination of the Z-axis 4 caused by the straightness error of the Y-axis 3.

In the above embodiment, the case where there is an error in the straightness of the Y-axis 3 has been described, but the inclination can be similarly corrected for straightness errors in other axes.

<Effects of the Invention> According to the present invention, it is possible to correct the inclination of the axis caused by the straightness error, and it is possible to perform highly accurate machining without the influence of the inclination error.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing an example of conventional polling hole machining without straightness correction. In the drawing, 3 is the Y axis, 4 is the Z axis, 5 is the main axis, 6 is the column,
8 is a Z-axis support mechanism, 9 is a tilt detector, 10 is a magnetostrictive element, 11 is its coil, 12 is a magnetostrictive displacement direction, 13 is a tilt/current converter, 14 is a reference tilt setter, and 15 is a fulcrum.

Claims (1)

[Claims] An inclination detector that detects the inclination of an axis caused by a straightness error of the moving axis in a machine tool, and an inclination correction driven by a magnetostrictive element that is attached to the axis support mechanism and operates according to the output of the inclination detector. A straightness correction device comprising a mechanism and configured to correct the inclination of an axis.