JPH05220638A - Linear motion guide device and table device employing it - Google Patents

Abstract

PURPOSE:To provide a linear motion guide device and a table device where the accuracy in height is stable, the adjusting capacity is excellent and the machining is facilitated. CONSTITUTION:A slit 7 to absorb the elastic deformation is provided to a sliding table 4 in a linear motion guide device which is provided with a track table 2, the sliding table 4 which is linearly guided along the track table 2, a rolling body 3 which is interposed in a rollable manner between the sliding table 4 and the track table 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motion guide device used for a linear guide part of, for example, a machine tool or an industrial robot and a table device using the same, and more particularly to a mounting surface of a rail and slide. The present invention relates to a device that gives a sliding base the ability to absorb misalignment such as machining error and mounting error and thermal expansion.

[0002]

2. Description of the Related Art As a table device using a conventional linear motion guide device, a table 201 is movably guided and supported on a fixed bed 200 via a linear motion guide device 300, as shown in FIG. Linear motion guide device 300
Is composed of a raceway 301 and a slide table 304 slidably supported on the raceway 301 via rolling elements 303, and a pair of raceways 301, 301 on the fixed bed 200.
301 are laid in parallel, and a table 201 is attached on a slide table 304 supported by each track 301, 301.

In such a table device, since the movement of the slide base 304 is hindered by the deviation of the parallelism due to the mounting error of the track base 301 or the like, it is necessary to mount the slide base 304 with high accuracy.

Even if the rails are mounted with high accuracy, a horizontal force acts on the rails 301 due to the difference in thermal expansion between the fixed bed 200 and the rails 301, for example.
1 may be deformed and the load acting on the inside of the raceway 301 and the sliding base 304 via the rolling elements 303 may increase.

Therefore, in order to absorb such misalignment and thermal expansion, various linear motion guide devices having the ability to absorb an error or to relieve a load acting internally have been proposed.

As a conventional linear motion guide device of this type, there are those described in, for example, JP-A-62-188636 and JP-A-2-229914.

First, the first prior art is Japanese Patent Laid-Open No. 62-1.
As described in Japanese Patent No. 88636, as shown in FIG.
A mounting bolt 308 is fixed between the slide table 304 and the table 201 so as to form a clearance 305 for absorbing deformation, and the clearance 305 enables relative displacement between the slide table 304 and the table 201 to be a rail or slide. This is to absorb the processing error and the like of the mounting surface of the moving table and reduce the internal load acting from the mounting surface error of the table 201.

A second conventional technique, Japanese Patent Laid-Open No. 2-2
As described in Japanese Patent Publication No. 29914, as shown in FIG.
In order to efficiently absorb and mitigate the mounting error of the raceway 301 or the sliding base and to improve the reliability, the mounting surface is formed as a curved surface 306 having a minute curvature in the axial direction, and the table 201 is fastened by mounting bolts. When fixing to
The curved surface 306 is pressed against the table 201 to cause elastic deformation, and the sliding base 304 and the table 201 are elastically deformed.
The relative displacement between the rails 301 or the sliding base 30
The processing error of the mounting surface of No. 4 is absorbed.

[0009]

However, in the case of the above-mentioned prior art, the error is absorbed between the table 201 and the slide base 304 in both the first and second prior arts. There was an obstacle to maintain high accuracy and ensure rigidity due to the gap between the two. Mounting bolt 30
There was also a problem that the adjustment ability was hindered by 8.

In particular, in the case of the second conventional technique, it was difficult to maintain the processing accuracy of the upper curved surface 306.

The present invention has been made in order to solve the above-mentioned problems of the prior art. The object of the present invention is to stabilize the height accuracy, maintain the rigidity, and further improve the adjusting ability, and to perform the machining. An object is to provide an easy linear motion guide device and a table device using the same.

Further, not only is the mounting error absorbed, but the load acting on the inside of the slide table due to thermal expansion is also absorbed and relaxed.

[0013]

In order to achieve the above object, according to the present invention, a way, a slide that is linearly guided along the way, and the slide and the way In a linear motion guide device comprising a rolling element rotatably interposed therebetween, the sliding base is provided with a slit for absorbing elastic deformation.

With respect to the slit, the X-axis of the XYZ Cartesian coordinate system is set in the moving direction of the slide table, the Y-axis is set in the horizontal direction, and the Z-axis is set in the vertical direction with reference to the state where the slide table is arranged on the track table. When it is taken in the direction, it can be provided in parallel with the XZ plane to absorb the deformation in the Y-axis direction, or in parallel with the XY plane instead of the XZ plane to absorb the deformation in the Z-axis direction. You can also do it.

On the other hand, in the table device of the present invention, a pair of raceways are provided in parallel to each other on the base, and a slide stand is movably provided along the raceways on the raceways via rolling elements. A table device in which a table is attached to a moving table is characterized by using the above-mentioned slit sliding table as the sliding table.

[0016]

In the linear motion guide device and the table device having the above-described structure, the slits absorb the misalignment and the deformation due to the thermal expansion due to the machining error of the mounting surfaces of the raceway base and the slide base, so that the rolling elements can be smoothly moved. It is possible to secure rolling.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments. FIG. 1 shows a basic configuration of a linear motion guide device according to the present invention. Reference numeral 1 denotes the entire linear motion guide device, and a rail 2 and a large number of balls 3 as rolling elements on the rail 2.
And a slide base 4 which is guided in a straight line direction via the. The sliding table 4 is provided with a slit 7 that absorbs elastic deformation.

That is, as shown in FIG. 2B, when the parallelism between the table 102 and the fixed bed 101 is poor, the deformation of the slide base 4 due to this tilt is absorbed by the slit 7. The smooth circulation operation of the ball 3 is guaranteed.

As a pattern for forming this slit, FIG.
A more specific linear motion guide device shown in (a) and (b) will be described as an example.

That is, the slide base 4 includes a slide base body 5 and
Side covers 6, which are attached to the front and rear end surfaces of the slide base body 5,
6, and the slit 7 for absorbing deformation is
The sliding table body 5 is provided.

The sliding table body 5 is a block body having a U-shaped cross section having a recess 8 at the center of the lower surface, and the rail 2 is inserted into the recess 8 and assembled so as to straddle the rail 2. Be done. A total of four rows of balls 3 are arranged in two rows on the right and left sides of the raceway 2 so as to endlessly circulate along the four endless orbits provided on the slide table 4.

That is, on the side surface of the raceway 2, two upper and lower loaded ball rolling grooves 9 are provided in the longitudinal direction of the raceway 2.
On the other hand, on the inner right and left sides of the slide table body 5, the loaded ball rolling groove 1 corresponding to the loaded ball rolling groove 9 formed on the raceway base 2.
0 is formed, and the ball 3 is rotatably interposed between the loaded ball rolling grooves 9 and 10.

The deformation absorbing slit 7 is shown in FIGS. 3 (a) to 3 (h).
The following eight types of modes are possible.

For convenience of explanation, with the slide table 4 arranged on the track table 2 as a reference, the X axis of the XYZ rectangular coordinate system is taken as the moving direction of the slide table and the Y axis is taken as horizontal left and right directions. ,
The Z axis will be described in the vertical direction.

The first example shown in FIG. 3 (a) is an example in which a first slit 71 parallel to the XZ plane is provided so that deformation in the Y-axis direction can be absorbed. That is, the central recess 8 of the slide base body 5
It is cut in parallel to the XZ plane from the lower surfaces of the left and right skirt portions 11 that sandwich it.

This example has a horizontal left-right adjustment capability and can cope with misalignment due to the left and right bends of the way 2.

The second example shown in FIG. 3 (b) is an example in which a second slit 72 parallel to the XY plane is provided so that deformation in the Z-axis direction can be absorbed. In particular, this second slit 72 slides. The left and right side surfaces 51, 52 of the base body 5 are cut.

This second example has the ability to adjust in the rolling direction around the X-axis, and can respond to the level error on the left and right of the way 2 by elastic deformation.

The third example shown in FIG. 3 (c) is an example in which a third slit 73 is provided in parallel with the XY plane so that deformation in the Z-axis direction can be absorbed. In particular, this third slit 73 slides. It is formed by cutting from the front and rear surfaces 53 and 54 of the base body 5.

In the third example, alignment in the pitching direction is possible, and it is possible to deal with the vertical deviation of the way 2.

The fourth example shown in FIG. 3 (d) is a combination of the first example and the second example. A first slit 71 parallel to the XZ plane and a second slit 72 parallel to the XY plane are provided. It shows an example.

The fifth example shown in FIG. 3 (e) is a combination of the first example and the third example, in which a first slit 71 parallel to the XZ plane and a third slit 73 parallel to the XY plane are provided. It is an example.

The sixth example shown in FIG. 3 (f) is a combination of the second example and the third example, in which the second and third slits 72, 73 are formed parallel to the XY plane. Particularly, in this sixth example, the second and third slits 72 and 73 are provided at the same height position, and surround the front and rear surfaces 53 and 54 and the left and right side surfaces 51 and 52 of the sliding base body 5 all around. Is formed.

The seventh example shown in FIG. 3 (g) is a combination of the first, second and third examples. The first example is parallel to the XZ plane.
The slit 71 and the second and third slits 72 and 73 parallel to the XY plane are all provided.

In the eighth example shown in FIG. 3 (h), a fourth slit 74 parallel to the YZ plane is provided so that elastic deformation in the X direction can be absorbed. The fourth slit 74 is formed by making a notch in the upper surface of the slide base body 5.

These first, second and third slits 7
The machining of 1, 72, 73 is performed by inserting a cutter from the side surface or the lateral surface of the slide base body 5 or by wire cutting, and is performed at the time of rough machining of the slide base body 5.

However, the formation of the slit is not limited to the cutting work by the cutter.

For example, FIGS. 4 (a) and 4 (b) show another embodiment of the seventh example, in which the slide table body 5 is fixed to the table with respect to the fixed portion 5A and the track table 2. And a sliding portion 5B that slides via a ball 5C. Then, the fixing portion 5A and the sliding portion 5B are integrated through a projection-welded ball to form the second and third slits 72, 73 between the fixing portion 5A and the sliding portion 5B. It is the one.

FIG. 5 is an enlarged view of the sliding table body 5 of FIGS. 3 (f) and 3 (g) as a typical example of the sliding table body shown in FIG. As shown in FIG. 1A, the first slit 71 is formed between the escape ball hole 12 for ball circulation provided in the skirt portion 11 and the inner side surface, and the second slit portion 72 is slidable with the ball escape hole 12. It is formed between the upper surface of the moving table body 5 and the upper surface of the moving table body 5. In addition, as shown in FIG.
3 is also formed between the escape ball hole and the upper surface.

Next, a table device using the above linear motion guide device will be described. The linear motion guide device may be composed of only the sliding base with slits of the present invention, or may be combined with a normal sliding base without slits.

FIG. 6 shows the structure of a basic table device. That is, the table device 100 has a pair of rails 21, 22 on the fixed bed 101 in parallel with each other.
Are laid, and two left and right rails 21 and 22 for a total of 4
The slide bases 4 are movably assembled, and the slide bases 4
The table 102 is fixed to the upper surface of the table by bolts or the like.

One of the rails 21 is used as a mounting reference, and the other rail 2 is mounted on the other rail 2 on the reference side.
2 is used for positioning and adjustment, and one is hereinafter referred to as a reference way and the other as a dependent way.

The reference side way 21 and the dependent side way 22
There are the following seven combinations as the combinations of the slide bases 4 used for.

The first combination shown in FIG. 6 (a) is the first combination.
The slide base 4 having the first slit 71 of the example is used on the subordinate side, and the standard track base 21 has the standard slide base 4 without slits.
'Is used.

With such a combination, misalignment and expansion in the Y-axis direction due to heat of the fixed bed 101 or table 102 can be absorbed.

The second combination shown in FIG. 6 (b) is the second combination.
The slide base 4 having the second slit 72 of the example is used on the subordinate side, and the standard track base 21 has a standard slide base 4 without slits.
'Is used.

With such a second combination, the rolling direction can be adjusted and the left and right bends of the dependent track way 22 can be coped with.

The third combination shown in FIG. 6C is the third combination.
The slide table 4 having the third slit 73 of the example is used as the reference track 2
It is used for both the No. 1 and the subordinate way 22.

By doing so, as shown in FIG. 6 (d), it is possible to cope with the bending of the table 102 and the vertical bending of the rails 21, 22.

The fourth combination shown in FIG. 6 (e) uses the slide base 4 having the first and second slits 71 and 72 of the fourth example on the subordinate side, and the standard type without slits on the reference side. The sliding base 4'of FIG.

The fifth combination shown in FIG. 6 (f) is the first and third slits 7 of the fifth example on both the subordinate side and the reference side.
The sliding base 4 provided with the reference numerals 1 and 73 is used.

The sixth combination shown in FIG. 6 (g) uses the slide base 4 having the second and third slits 72, 73 of the sixth example formed on the subordinate side.

The seventh combination shown in FIG. 6 (h) is the first, second, and third slits 71, 72, 7 of the seventh example on the subordinate side.
3 is an example in which a slide base 4 having a slit 3 is used and a standard slide base 4'without a slit is used on the reference side.

[0054]

EFFECTS OF THE INVENTION The present invention having the above-mentioned structure and operation has a stable height accuracy, a good adjusting ability, and easy processing because it is simply provided with a slit for absorbing deformation. A linear motion guide device and a table device using the same can be realized.

Further, not only the mounting error can be absorbed, but also the load acting on the inside of the slide base due to the thermal expansion can be absorbed and relaxed.

[Brief description of drawings]

1 (a) and 1 (b) are sectional views schematically showing a linear motion guide device according to an embodiment of the present invention.

2A and 2B show a more specific linear motion guide device in which a slit of the present invention is formed. FIG. 2A is a perspective view and FIG. 2B is a sectional view.

3 (a) to 3 (h) are perspective views of a slide base body showing various aspects of the slit of FIG.

4A and 4B show another embodiment of the sliding base body shown in FIG. 3F, wherein FIG. 4A is a sectional view and FIG. 4B is a partially cutaway perspective view.

5 (a) is an enlarged view of FIG. 3 (e), and FIG. 5 (b) is FIG.
It is an enlarged view of (g).

6 (a) to 6 (h) are schematic configuration diagrams of a table device showing an example of a combination of various slides and the table device of FIG.

FIG. 7 is a schematic perspective view of a table device using a conventional linear motion guide device.

FIG. 8 is a sectional view of a conventional linear motion guide device.

FIG. 9 is a side view of another conventional linear motion guide device.

[Explanation of symbols]

 1 Linear motion guide device 2 Track base 3 Ball (rolling element) 4 Sliding base 5 Sliding base body 7 Slits 71, 72, 73 1st, 2nd, 3rd slit 8 Central recess 9, 10 Load ball rolling Groove 11, Skirt 100 Table device 101 Fixed bed 102 Table 4'Standard type slide

Claims (5)

[Claims] 1. A raceway base, a slide base linearly guided along the raceway base, and a rolling element rotatably interposed between the slide base and the raceway base. In the linear motion guide device, a slit for absorbing elastic deformation is provided on the slide base. 2. With reference to the state in which the slide table is placed on the track table, the X axis of the XYZ rectangular coordinate system is set in the moving direction of the slide table, the Y axis is set in the horizontal direction, and the Z axis is set in the vertical direction. The linear motion guide device according to claim 1, wherein the slit is provided parallel to the XZ plane to absorb the deformation in the Y-axis direction. 3. The slit is provided in parallel with the XY plane instead of the XZ plane so that the deformation in the Z-axis direction can be absorbed.
The linear motion guide device according to. 4. A slit is provided in parallel with the YZ plane instead of the XZ plane so that the deformation in the X-axis direction can be absorbed.
The linear motion guide device according to. 5. A pair of raceways are provided on the base in parallel to each other, and a slide table is movably provided along the raceway on the raceway via rolling elements, and a table is attached to the slide table. A table device, wherein the sliding table according to claim 1, 2, 3 or 4 is used as the sliding table.