JP2000097233A - Curvelinear guide device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an arc motion guide in the vertical direction with a high degree of accuracy by using such a structure which can prevent a burden of a load from exerting a bending moment to a slide bed and a track rail. SOLUTION: A curvelinear guide device comprises a curved track rail 1 having ball running grooves 11, 12 formed in the upper and both side surfaces along an arc having a predetermined curvature, a slide bed 3 having ball running grooves 21, 22 formed in a horizontal part and both sleeve parts along an arc having a predetermined curvature at positions corresponding to the ball running grooves 11, 12 in the track rail 1, and unload ball holes 23, 24 formed adjacent to these ball running grooves 21, 22, a side cover 5 having in its inner side passages connecting the ball running grooves 21, 22 and the unload ball holes 23 with each other so as to form an endless ball circulating passage, and several balls circulating the endless ball circulating groove and applying loads between the ball rolling grooves in the track rail 1 and the ball running grooves 21, 22 of the slide bed 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved guide device, and more particularly, to a curved track rail formed by curving in a vertical direction at a predetermined curvature, and a slide table sliding along the curved track rail. The present invention relates to a curved guide device provided.

[0002]

2. Description of the Related Art Pendulum type railway vehicles, various measuring devices,
In machine tools, various robots, and the like, there is a case where a so-called arc motion in a vertical plane that moves on an orbit formed in a circular arc with a predetermined curvature in a vertical direction is required.
In this case, conventionally, rolling is performed by rolling a roller, a wheel, or the like on an arc-shaped rail.

[0003] However, the above-described apparatus has a drawback in that rattling or clearance is generated between the rail and the rollers or wheels due to vibration or the like, and accurate guidance of arc movement cannot be performed.

As an apparatus capable of accurately guiding an arc movement, a track rail having a ball rolling groove and an infinite ball circulation path slidably supported via a number of balls on the track rail are formed. There is a curved guide device provided with a sliding table. This curve guide device is usually used to guide an arc motion in a horizontal plane,
If this curved guide device is used in a state rotated by 90 °, it is possible to guide the circular motion in a vertical plane.

FIG. 28 is a perspective view showing an example of guiding the circular motion in a vertical plane using the above-described curved guide device.
The curved guide device includes a track rail 51 and a slide table 61 having an infinite ball circulation path slidably supported on the track rail 51 via balls 52. The track rail 51 is fixed to a vertical support surface 55 by a plurality of bolts 56. The track rail 51 has a substantially rectangular cross section and is formed in an arc shape with a predetermined curvature in the vertical direction.
As shown in FIG. 29 (a cross-sectional view taken along line XXIX-XXIX in FIG. 28), ball rolling grooves 59, 59 are formed in the longitudinal direction on the upper surface 57 on the center side of the arc and on the lower surface 58 facing the upper surface 57, respectively. ing. The ball rolling grooves 59, 59 are configured such that the balls can roll in rows.

A slide table 61 fitted to the track rail 51
As shown in FIG. 29, has upper and lower sleeve portions 62 and 63 and a connecting portion 64 connecting the both sleeve portions 62 and 63, and has a substantially U-shaped cross section. Ball rolling grooves 65, 65 that sandwich a large number of balls 52 with the ball rolling grooves 59, 59 of the track rail 51 are formed on the inner surfaces of the sleeve portions 62, 63. The slide table 61 has the ball rolling groove 65.
No-load ball holes 67 corresponding to the above are formed.

As shown in FIG. 28, a pair of side covers 68, 68 are attached to the front and rear ends of the slide table 61 in the moving direction, and these side covers 68, 68 have ball rolling grooves. A ball direction changing passage is formed which connects both ends of the no-load ball holes 65 and both ends of the no-load ball hole 67 to form an endless track. The large number of balls 52 circulate in these endless tracks and slide. Rolling is performed while applying a load between the loaded ball rolling grooves 65 of the table 61 and the ball rolling grooves 59 of the track rail 51.

FIG. 30 is a perspective view showing a ball rolling groove 65 formed in the sleeve 62 of the slide table 61. As shown in FIG. 30, the ball rolling groove 65 extends linearly in the longitudinal direction of the slide table 61. The groove depth is formed in an arc shape in which both ends are shallow and the center is deep.

[0009]

The above-mentioned conventional curved guide device is designed to guide an arc motion in a horizontal plane, and therefore, guides a circular motion of a heavy object in a vertical plane. Has the drawback of being inappropriate. In detail, the ball rolling grooves 59,
A track rail 51 having a rail 59 is fixed to a vertical support surface 55 by a plurality of bolts 56, and as shown in FIG.
1 is fixed to the side surface 61a of the slide table 61 to be fitted.
That is, the heavy object 70 is supported in a cantilever state by the slide table 61 and the track rail 51. for that reason,
A large bending moment acts on the slide table 61 and the track rail 51 due to the weight W of the heavy object 70.

When a large bending moment is applied to the slide table 61, the bending moment acts to separate the sleeves 62, 63 from each other. There has been a problem that the distance between the ball rolling grooves 65, 65 to be formed changes, and accurate guidance of arc movement cannot be performed. The track rail 51 is fixed to the vertical support surface 55 by a bolt 56. However, since a large bending moment acts on the track rail 51, the track rail 51 is fixed at the portion fixed by the bolt 56 and the vicinity thereof. However, there is a problem that the other part swells right and left without adhering to the support surface 55.
Therefore, when the slide table 61 slides along the track rail 51, there is a problem in that the slide table 61 shakes right and left and cannot accurately guide an arc motion.

In order to avoid this, a pair of track rails 51, 51 are provided symmetrically as shown in FIG.
There is proposed a curved guide device in which a sliding table 61 is provided, and a sliding table 61 for connecting the sliding tables 61 and 61 and mounting a heavy object 70 is provided.

In the curved guide device shown in FIG. 31, the bending moment generated by the load of the heavy object 70 can be shared between the two slide tables 61, 61 and the two track rails 51, 51. However, since there is no change in the structure in which the load is applied to the slide table 61 and the track rail 51 from the side, depending on the weight of the heavy object 70,
As in the example shown in FIG. 29, there is a problem that the distance between the ball rolling grooves forming a pair of the slide tables changes, and the track rail undulates left and right. Further, the curve guide device shown in FIG. 31 has a problem that the number of elements (parts) constituting the device is too large, so that the device becomes expensive and hinders practical use. there were.

In the conventional curved guide devices shown in FIGS. 28 to 31, the radial load applied to each slide 61 is supported only by the upper two rows of balls.
There is a problem that the radial load capacity is inferior.

The present invention has been made in view of the above-mentioned circumstances, and adopts a structure in which a bending moment is not generated on a slide table and a track rail due to a load of a load, thereby achieving a high-precision vertical arc motion. It is an object of the present invention to provide a curvilinear guide device capable of performing the above-mentioned guidance, minimizing the number of elements (parts) constituting the device, and having a high radial load capability.

[0015]

In order to achieve the above-mentioned object, a curved guide device according to the present invention is formed so as to be curved at a predetermined curvature in a vertical direction, and has a concave or convex upper surface and a predetermined curvature on both side surfaces. A curved track rail having a ball rolling groove formed along the arc of a circle, a horizontal portion and a pair of sleeve portions hanging downward from both sides thereof, and having a concave portion on the lower surface side, and A ball rolling groove formed along a circular arc of a predetermined curvature at a position corresponding to the ball rolling groove of the track rail in both sleeve portions, and a no-load ball hole formed adjacent to the ball rolling groove. And a ball-infinite circulation path which is attached to both front and rear end surfaces of the slide table, and connects the ball rolling groove and each end of the no-load ball hole to each other on the inner surface side. Side cover having a ball direction changing passage, A plurality of balls that circulate in the annular passage and apply a load between the ball rolling grooves of the track rail and the ball rolling grooves of the slide base, and are formed on both side surfaces of the curved track rail. The ball rolling grooves formed in a row form a roller rolling surface on which a cylindrical roller rolls in parallel along the track rail on the upper surface of the track rail, and is formed on both sleeves of the slide table. The ball rolling grooves formed in a row are arranged in a row. The roller rolling surface is arranged on the lower surface of the horizontal portion of the slide base in a position corresponding to the roller rolling surface on the upper surface of the track rail along an arc of a predetermined curvature in parallel. And a contact angle line connecting the ball and a contact point of the opposing ball rolling groove is set at an angle of 30 ° with respect to a horizontal line.

According to the present invention, when a heavy object is mounted on the upper surface of the slide table, the weight of the heavy object acts vertically on the center of the slide table and the track rail, and the weight of the slide table and the track is increased. Since a load is equally applied to the ball rolling groove of the rail, no bending moment acts on the slide table and the track rail.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a curve guiding device according to the present invention will be described with reference to FIGS. 1 and 2 are views showing the overall configuration of a curve guide device according to the present invention. FIG. 1 is a side view of the curve guide device.
FIG. 2 is a perspective view of a curved guide device. 3 is an enlarged view of a main part of FIG. 2, and FIG. 4 is a sectional view taken along line IV-IV of FIG.

As shown in FIGS. 1 and 2, the curvilinear guide device includes a curvilinear track rail 1 formed by curving at a predetermined curvature in a vertical direction, and a state where the curvilinear track rail 1 is curving at a predetermined curvature. A support table 2 that supports the lower surface of the curved track rail 1 so that it can be maintained, and a slide table 3 that forms an endless ball circulation path slidably supported on the curved track rail 1 via a large number of balls 4. It is configured.

The curved track rail 1 has a substantially rectangular cross section and is formed in an arc shape with a predetermined curvature in the vertical direction. The curved track rail 1 has a center of curvature O above the vertical direction, a radius of curvature set to R, an upper surface 1a of the curved track rail 1 having a concave surface, and a lower surface 1b having a convex surface.

As shown in FIGS. 3 and 4, ball rolling grooves 12 are formed on the left and right side surfaces 1c and 1d of the curved track rail 1 along an arc having a predetermined curvature. The slide table 3 has a horizontal portion 3a and a pair of left and right sleeve portions 3b, 3b hanging downward from both sides thereof, and has a concave portion on the lower surface side. A ball rolling groove 22 is formed on both sleeves 3b of the sliding base 3 along a circular arc (curvature radius r) having a predetermined curvature at a position corresponding to the ball rolling groove 12 of the curved track rail 1.
Are formed. On the upper surface 1a of the curved track rail 1, ball rolling grooves 11, 1 are arranged in parallel along the track rail.
1 is formed. On the lower surface of the horizontal portion 3a of the slide base 3, ball rolling grooves 11, 11 on the upper surface 1a of the track rail 1 are provided.
Are formed in parallel with each other along a circular arc (curvature radius r) having a predetermined curvature at a position corresponding to.

The slide table 3 has a pair of upper and lower unloaded ball holes 2 adjacent to the pair of upper and lower ball rolling grooves 21 and 22 and corresponding to the ball rolling grooves 21 and 22.
3, 24 are formed. As shown in FIG. 3, the ball rolling grooves 2 are formed on the inner surface of the front and rear end surfaces of the slide table 3.
Side lids 5 and 5 having ball direction changing passages which connect the ends of the unloaded ball holes 23 and 24 to each other to form an endless circulation passage are attached. The large number of balls 4 circulate in the respective endless circulation paths, and load is applied between the ball rolling grooves 11 and 12 of the curved track rail 1 and the ball rolling grooves 21 and 22 of the slide 3. It is designed to roll while rolling. As shown in FIG. 4, a pair of lower holding plates 6a, 6a
The upper side holding plate 6b is fixed, and the balls 4 are held on the slide 3 by the holding plates 6a and 6b.

The ball rolling grooves 11, 12, 21, 22
Is formed into a curved surface with a radius slightly larger than the ball radius, and the ball rolling grooves 11, 12, 21, 22 are formed.
2 has only one contact surface on which the ball 4 contacts and rolls. Then, the ball rolling grooves 11, which face the ball 4,
The contact angle line connecting the contact points 21 or 12, 22 is set at an angle of 45 ° with respect to the horizontal line.

FIG. 5 is a diagram showing the relationship between the ball rolling groove 11 formed on the upper surface of the curved track rail 1, the ball rolling groove 21 formed in the horizontal portion 3 a of the slide 3, and the ball 4. . As shown in FIG. 5, the cross-sectional shape of each of the ball rolling grooves 11 and 21 cut along a plane perpendicular to the axial direction is a single arc shape, that is, a so-called circular arc groove shape. The rolling contact surface 7 for each of the ball rolling grooves 11 and 21 has a long axis a perpendicular to the axial direction.
And an elliptical arc surface.

At each contact position along the major axis a of the rolling contact surface 7, the distance from the rotation center axis O of the ball 4 is different, so that a differential slip occurs on the rolling contact surface 7. That is, when the ball 4 makes a rolling motion, rolling contact without slip occurs at a position on the long axis of the rolling contact surface 7, and rolling contact with slip occurs at other positions.

Conventionally, friction was reduced by reducing the differential slip as much as possible, but the present invention is required to control the axial friction by utilizing the differential slip. Dynamic rigidity and damping properties are obtained.

In order to utilize differential slip positively,
It is preferable that the radius of curvature r of each of the ball rolling grooves 11 and 21 is set in a range smaller than approximately 0.52 of the diameter Da of the ball 6. However, if the radius of curvature r is too small, the friction becomes too large, impairing the light movement which is the original characteristic of the rolling guide device.
It is preferable to set in the range of 52 to 0.505. The depth of the ball transfer grooves 11 and 21 is the diameter D of the ball 6.
It is set to approximately １ ／ of a.

FIG. 6 shows the ratio (r / Da) of the radius of curvature r of the ball rolling grooves 11 and 21 to the ball diameter Da.
And the differential slip ratio S are 30kg, 50kg, 80kg
3 is a graph showing three types of applied loads. FIG.
Is the ratio (r / Da) of the radius of curvature r of the ball rolling grooves 11 and 21 to the ball diameter Da when the applied load is 50 kg.
And the differential slip ratio S, the ratio of the radius of curvature of the ball rolling groove (r / Da) is 0.52, and the differential slip ratio S0
7 is a graph showing the ratio as a differential slip ratio (S / S0) with reference to FIG. Here, the differential slip ratio S refers to the center 7 of the rolling contact surfaces 7, 7 of the balls sandwiched between the pair of ball rolling grooves with the ball rolling grooves 11, 21.
The distance between a and 7a is d1, and the distance at the end of the major axes a and a is d2.
S = {π (d1−d2) / πd1} × 100
(%).

As apparent from FIGS. 6 and 7, the differential slip ratio S does not change so much up to 0.52.
It can be seen that when it becomes 52 or less, it rapidly increases. Such a shape of the ball rolling groove may be applied to at least one of the ball rolling groove of the track rail 1 and the slide base 3.

The ball rolling groove 12 formed on the side surface of the curved track rail 1 and the ball rolling groove 22 formed on the sleeve 3b of the slide 3 are also set in a relationship as shown in FIG. .

In this embodiment, when a heavy object 70 (indicated by a virtual line) is mounted on the upper surface of the slide table 3 as shown in FIG. Acting vertically on the center of the track rail 1
And the ball rolling grooves 11, 12, 21,
Since the load is evenly applied to the shaft 22, the radial load capacity is extremely high, and no bending moment acts on the slide 3 and the track rail 1. Further, in the present embodiment, the contact angle coincides with the radial direction, and the depth 11, 12, 21, 22 of the ball transfer groove is equal to the diameter Da of the ball 6.
And the radius of curvature r is approximately 52% of the diameter Da of the ball 6, so that the ball 6 and the ball transfer grooves 11, 1
Since the contact area of 2, 21, 22 is increased, the radial load capacity is extremely high.

Next, a method of manufacturing the curve guide device shown in FIGS. 1 to 5 will be described with reference to FIGS. FIG. 8 is a perspective view showing the upper and lower ball rolling grooves 21 and 22 formed on the horizontal portion 3a and the sleeve portion 3b of the slide table 3 of the present invention. The ball rolling grooves 21 and 22 are formed in an arc shape with a predetermined curvature in the vertical direction.
2 is convex downward. Ball rolling grooves 21, 22
Means that the center of curvature O is vertically above and the radius of curvature is R
Is set to The inner surfaces of both sleeve portions 3b of the slide table 3 are formed in a flat shape, and the lower surface of the horizontal portion 3a is formed as a curved surface having a radius of curvature r. The depth of the ball rolling grooves 21 and 22 is uniform along the longitudinal direction of the slide 3. Also, the upper surface 1a and both side surfaces 1c, 1 of the curved track rail 1
The ball rolling grooves 11 and 12 formed in d are also formed in an arc shape with a predetermined curvature (radius of curvature r) in the vertical direction.

In the present invention, both sleeve portions 3b of the slide table 3
Ball rolling groove 22 and curved track rail 1 formed in
Since the method of grinding the ball rolling grooves formed on both side surfaces 1c and 1d of this embodiment is characteristic as compared with the conventional method, this grinding method will be mainly described. In the following description of the manufacturing method, elements having the same function will be described using the same reference numerals.

FIG. 9 is an explanatory view showing an example of a method of grinding the ball rolling groove 22 of the slide 3. This example is a grinding method in the case where the radius of curvature of the ball rolling groove 22 is large and the arc is almost straight. As shown in FIG.
Is fixed to the table 16 of the grinding machine. The grindstone 14 fixed to the tip of the grindstone shaft 13 is located in the recess of the slide 3. With the movement of the work (slide table 3) or the grindstone 14 in the direction perpendicular to the paper surface, the grindstone 14 moves vertically by the NC control while the grindstone shaft 13 is kept vertical.
In this case, the cutting direction of the grindstone 14 is the horizontal direction.

FIGS. 10A and 10B are explanatory views showing another example of a method of grinding the ball rolling groove 22 of the slide 3. FIG. 10A is a plan view, FIG. 10B is a side view, and FIG. (C) shows the relationship between the grindstone and the ball rolling groove. This example is a grinding method when the radius of curvature of the ball rolling grooves 21 and 22 is small.

As shown in FIGS. 10A and 10B, the grindstone 14 fixed to the tip of the grindstone shaft 13 is located in the recess of the slide 3. Then, as shown in FIG. 10C, the inclination of the grinding wheel shaft 13 is NC-controlled so that the axis of the grinding wheel shaft 13 always faces the center O of the arc of the ball rolling groove 22. Then, the movement of the grindstone 14 is NC-controlled so that the grindstone 14 always moves on an arc having a predetermined curvature. In this case, the cutting direction of the grindstone 14 is the horizontal direction. Whetstone 1
The smaller the diameter of 4 is, the closer the ball rolling groove 22 can be to the set shape.

FIG. 11 is an explanatory view showing still another example of the method of grinding the ball rolling groove 22 of the slide 3 and FIG.
FIG. 11B is a side view, and FIG. 11B is a diagram showing a relationship between a grindstone and a ball rolling groove. As shown in FIG.
XY table or rotary table 1 using jig 17
Fix to 6. In the case of a rotary table, the table 16
Is rotatable about the Y-Y axis. The grindstone 14 fixed to the tip of the grindstone shaft 13 is located in the recess of the slide 3.

As shown in FIG. 11 (b), the slide table 3 rotates around the center O of the arc of the ball rolling groove 22. In this case, the grindstone 14 is fixed, and the cutting direction of the grindstone 14 is a vertical direction. By reciprocatingly moving the slide 3, the opposing pair of ball rolling grooves 22 are ground.

FIG. 12 is an explanatory view showing still another example of a method of grinding the ball rolling groove 22 of the slide 3.
12A is a plan view, FIG. 12B is a side view, and FIG.
FIG. 3 is a view showing a relationship between a grinding wheel and a ball rolling groove. In this example, the direction of the ball rolling groove is opposite to that in the example shown in FIG. 10, and the ball rolling groove is convex upward.

As shown in FIGS. 12 (a) and 12 (b), the grindstone 14 fixed to the tip of the grindstone shaft 13 is located in the recess of the slide 3. Then, as shown in FIG. 12 (c), the inclination of the grinding wheel shaft 13 is NC-controlled so that the axis of the grinding wheel shaft 13 always faces the center O of the arc of the ball rolling groove 22. Then, the movement of the grindstone 14 is NC-controlled so that the grindstone 14 always moves on an arc having a predetermined curvature. in this case,
The cutting direction of the grindstone 14 is a horizontal direction.

FIG. 13 is an explanatory view showing still another example of the method of grinding the ball rolling groove 22 of the slide 3 and FIG.
FIG. 13B is a side view, and FIG. 13B is a diagram showing a relationship between a grindstone and a ball rolling groove. In this example, the direction of the ball rolling groove is
In this case, the ball rolling groove is upwardly convex.

As shown in FIG. 13A, the slide table 3 is fixed to an XY table or a rotary table 16 using a jig 17. In the case of a rotary table, the table 16 is Y
-It is rotatable around the Y line. Wheel axis 13
The grindstone 14 fixed to the tip of the slider 3 is located in the recess of the slide 3.

As shown in FIG. 13 (b), the slide table 3 rotates around the center O of the arc of the ball rolling groove 22. In this case, the grindstone 14 is fixed, and the cutting direction of the grindstone is the vertical direction. By reciprocatingly moving the slide 3, the opposing pair of ball rolling grooves 22 are ground.

FIG. 14 shows the upper ball rolling groove 21 of the slide 3.
FIG. 3 is an explanatory view showing an example of a grinding method of the embodiment. This example is applicable to both cases where the radius of curvature of the ball rolling groove is large and small. As shown in FIG.
Is fixed to the table 16 of the grinding machine. A part of the grindstone 14 fixed to the tip of the grindstone shaft 13 is
Is located in the concave portion. The grindstone 14 moves with the work (slide table 3) or the grindstone 14 in a direction orthogonal to the paper surface.
The grindstone shaft 13 moves up and down by NC control while keeping the horizontal state. In this case, a large grindstone 14 can be used, and the cutting direction of the grindstone 14 is a vertical direction.

FIG. 15 is an explanatory view showing an example of a method of grinding the ball rolling grooves 11 and 12 of the curved track rail 1. This example is a grinding method in the case where the radius of curvature of the ball rolling grooves 11 and 12 is large and the arc is close to a straight line. As shown in FIG. 15, the curved track rail 1 is a mounting base 1 having an arc-shaped upper surface.
8 is fixed to the table 16 of the grinding machine. The grinding of the lower ball rolling groove 12 is performed by a grindstone 14A, and the grinding of the upper ball rolling groove 11 is performed by a grindstone 14B.
That is, the grindstone 14A fixed to the tip of the grindstone shaft 13A is
With the movement of the work (track rail 1) or the grindstone 14A in the direction perpendicular to the paper surface, the grindstone shaft 13A moves vertically by NC control while maintaining the vertical state. In this case, the cutting direction of the grindstone 14A is the horizontal direction. On the other hand, with the movement of the work (track rail 1) or the grindstone 14B in the direction perpendicular to the paper surface, the grindstone 14B
3B moves by the NC control in the vertical direction while keeping the horizontal state. In this case, a large grindstone 14B can be used, and the cutting direction of the grindstone 14B is a vertical direction.

FIG. 16 is an explanatory view showing another example of a method of grinding the ball rolling grooves 11, 12 of the curved track rail 1. FIG. 16 (a) is a side view, and FIG. 16 (b) is a grinding wheel and a ball. It is a figure showing the relation with a rolling groove. In this example, the ball rolling groove 1
This is a grinding method in the case where the radius of curvature is small. Grinding of the lower ball rolling groove 12 is performed by a grinding wheel 14A,
Grinding of the upper ball rolling groove 11 is performed by a grindstone 14B.

As shown in FIG. 16A, the curved track rail 1 is fixed to a table 16 of a grinding machine via a mount 18 having an arc-shaped upper surface. As shown in FIG. 16B, the inclination of the grinding wheel shaft 13A is NC-controlled so that the axis of the grinding wheel shaft 13A always faces the center O of the arc of the ball rolling groove. Then, the movement of the grindstone 14A is NC-controlled so that the grindstone 14A always moves on an arc having a predetermined curvature. In this case, the cutting direction of the grindstone 14A is the horizontal direction. The smaller the diameter of the grindstone, the closer the ball rolling groove 12 can be to the set shape. On the other hand, the grindstone 14B moves up and down by NC control in accordance with the movement of the work (track rail 1) or the grindstone 14B in the direction perpendicular to the paper surface, while the grindstone shaft 13B is kept horizontal. In this case, the whetstone 14
B can be a large one, and the cutting direction of the grindstone 14B is vertical.

Next, a second embodiment of the curve guide device according to the present invention will be described with reference to FIGS. FIG.
7 is a sectional view of the curve guide device, and FIG. 18 is a perspective view of the curve guide device. In the embodiment shown in FIGS. 17 and 18, components having the same functions as those in the embodiment shown in FIGS. 1 to 5 will be described using the same reference numerals.

The main configuration of the curved track rail 1 and the slide base 3 in this embodiment is the same as that of the first embodiment shown in FIGS. 1 to 5, except for the configuration of the ball rolling groove. That is, in the curve guide device of the present embodiment,
As shown in FIGS. 17 and 18, a roller rolling surface 11 a to which short cylindrical rollers 8 transfer in parallel along the track rail 1 is formed on the rail upper surface 1 a of the curved track rail 1. . On the lower surface of the horizontal surface 3a of the slide table 3, the roller rolling surfaces 21a, 21a, 21a are formed. On the upper surface of the slide table 3, there are provided no-load roller holes 23a for the rollers 8,
23a are formed.

The left and right side surfaces 1 of the curved track rail 1
Lower ball rolling grooves 12 are formed in c and 1d along an arc having a predetermined curvature. Both sleeves 3b, 3b of slide 3
The lower ball rolling groove 2 is formed along a circular arc having a predetermined curvature at a position corresponding to the lower ball rolling groove 12 of the curved track rail 1.
2 are formed. Other configurations are the same as those of the embodiment shown in FIGS. The contact angle line connecting the contact points of the roller rolling surfaces 11a and 21a opposed to the roller 8 is set in the vertical direction. The contact angle line connecting the contact points of the lower ball rolling grooves 12 and 22 facing the ball 4 is set at an angle of 30 ° with respect to the horizontal line.

In this embodiment, the radial load is supported by two rows of balls and two rows of rollers, and a short cylindrical roller is used for the rolling element. It is high, can support heavy loads, and can realize high rigidity.

Next, a method of manufacturing the curve guiding device shown in FIGS. 17 and 18 will be described with reference to FIGS. FIG. 19 is a perspective view showing the roller rolling surface 21a and the ball rolling groove 22 formed on the horizontal portion 3a and the sleeve portion 3b of the slide table 3 of the present invention. The roller rolling surface 21a and the ball rolling groove 22 are formed in an arc shape with a predetermined curvature (radius of curvature r) in the vertical direction.
1a and the ball rolling groove 22 are convex downward.

FIG. 20 is an explanatory view showing an example of a method of grinding the ball rolling grooves 22 of the slide 3. This example is a grinding method in the case where the radius of curvature of the ball rolling groove 22 is large and the arc is almost straight. As shown in FIG. 20, the horizontal portion 3a of the slide 3 is fixed to the table 16 of the grinding machine. Wheel axis 13
The grindstone 14 fixed to the tip of the slider 3 is located in the recess of the slide 3. With the movement of the work (slide table 3) or the grindstone 14 in the direction perpendicular to the paper surface, the grindstone 14 moves vertically by the NC control while the grindstone shaft 13 is kept vertical. In this case, the cutting direction of the grindstone 14 is the horizontal direction.

FIG. 21 is an explanatory view showing another example of a method of grinding the ball rolling groove 22 of the slide table 3, wherein FIG. 21 (a) is a plan view, FIG. 21 (b) is a side view, and FIG. (C) shows the relationship between the grindstone and the ball rolling groove. This example is a grinding method when the radius of curvature of the ball rolling grooves 21 and 22 is small. The horizontal portion 3a of the slide 3 is fixed to the table 16 of the grinding machine.

As shown in FIGS. 21A and 21B, the grindstone 14 fixed to the tip of the grindstone shaft 13 is located in the recess of the slide 3. Then, as shown in FIG. 21C, the inclination of the grinding wheel shaft 13 is NC-controlled so that the axis of the grinding wheel shaft 13 always faces the center O of the arc of the ball rolling groove 22. Then, the movement of the grindstone 14 is NC-controlled so that the grindstone 14 always moves on an arc having a predetermined curvature. In this case, the cutting direction of the grindstone 14 is the horizontal direction. Whetstone 1
The smaller the diameter of 4 is, the closer the ball rolling groove 22 can be to the set shape.

FIG. 22 is an explanatory view showing still another example of the method of grinding the ball rolling groove 22 of the slide 3 and FIG.
FIG. 22B is a side view, and FIG. 22B is a diagram showing a relationship between a grindstone and a ball rolling groove. As shown in FIG.
XY table or rotary table 1 using jig 17
Fix to 6. In the case of a rotary table, the table 16
Is rotatable about the Y-Y axis. The grindstone 14 fixed to the tip of the grindstone shaft 13 is located in the recess of the slide 3.

As shown in FIG. 22B, the slide table 3 rotates around the center O of the arc of the ball rolling groove 22. In this case, the grindstone 14 is fixed, and the cutting direction of the grindstone 14 is a vertical direction. By reciprocatingly moving the slide 3, the opposing pair of ball rolling grooves 22 are ground.

FIG. 23 is an explanatory view showing still another example of the method of grinding the ball rolling groove 22 of the slide 3.
23A is a plan view, FIG. 23B is a side view, and FIG.
FIG. 3 is a view showing a relationship between a grinding wheel and a ball rolling groove. In this example, the direction of the ball rolling groove is opposite to the example shown in FIG. 21, and the ball rolling groove is convex upward. Slide table 3
Is fixed to the table 16 of the grinding machine.

As shown in FIGS. 23 (a) and 23 (b), the grindstone 14 fixed to the tip of the grindstone shaft 13 is located in the recess of the slide 3. Then, as shown in FIG. 23 (c), the inclination of the grinding wheel shaft 13 is NC-controlled so that the axis of the grinding wheel shaft 13 always faces the center O of the arc of the ball rolling groove 22. Then, the movement of the grindstone 14 is NC-controlled so that the grindstone 14 always moves on an arc having a predetermined curvature. in this case,
The cutting direction of the grindstone 14 is a horizontal direction.

FIG. 24 is an explanatory view showing still another example of a method of grinding the ball rolling groove 22 of the slide 3 and FIG.
FIG. 24B is a side view, and FIG. 24B is a diagram showing a relationship between a grindstone and a ball rolling groove. In this example, the direction of the ball rolling groove is
In this case, the ball rolling groove is upwardly convex.

As shown in FIG. 24A, the slide table 3 is fixed to an XY table or a rotary table 16 using a jig 17. In the case of a rotary table, the table 16 is Y
-It is rotatable around the Y line. Wheel axis 13
The grindstone 14 fixed to the tip of the slider 3 is located in the recess of the slide 3.

As shown in FIG. 24 (b), the slide 3 rotates around the center O of the arc of the ball rolling groove 22. In this case, the grindstone 14 is fixed, and the cutting direction of the grindstone is the vertical direction. By reciprocatingly moving the slide 3, the opposing pair of ball rolling grooves 22 are ground.

FIG. 25 is an explanatory view showing an example of a method of grinding the roller rolling surface 21a of the slide 3. This example is applicable to both cases where the radius of curvature of the roller rolling surface is large and small. As shown in FIG. 25, the horizontal portion 3a of the slide 3 is fixed to the table 16 of the grinding machine. A part of the grindstone 14 fixed to the tip of the grindstone shaft 13 is located in the concave portion of the slide 3. With the movement of the work (slide table 3) or the grindstone 14 in the direction perpendicular to the paper surface, the grindstone 14 moves vertically by the NC control while the grindstone shaft 13 is kept horizontal. In this case, a large grindstone 14 can be used, and the cutting direction of the grindstone 14 is a vertical direction.

FIG. 26 is an explanatory view showing an example of a method of grinding the roller rolling surface 11a and the ball rolling groove 12 of the curved track rail 1. This example is a grinding method in the case where the radius of curvature of the ball rolling groove 12 is large and the arc is close to a straight line. FIG.
As shown in the figure, the curved track rail 1 is fixed to a table 16 of a grinding machine via a mounting base 18 having an arc-shaped upper surface. Grinding of the ball rolling groove 12 is performed by a grindstone 14A, and grinding of the roller rolling surface 11a is performed by a grindstone 14B. That is, the grinding wheel 14 fixed to the tip of the grinding wheel shaft 13A
A is the work (track rail 1) in the direction perpendicular to the paper.
Alternatively, with the movement of the grinding wheel 14A, the grinding wheel shaft 13A moves vertically by NC control while maintaining the vertical state.
In this case, the cutting direction of the grindstone 14A is the horizontal direction. On the other hand, the grindstone 14B moves up and down by NC control in accordance with the movement of the work (track rail 1) or the grindstone 14B in the direction perpendicular to the paper surface, while the grindstone shaft 13B is kept horizontal. In this case, a large grindstone 14B can be used, and the cutting direction of the grindstone 14B is a vertical direction.

FIG. 27 is an explanatory view showing another example of a method of grinding the roller rolling surface 11a and the ball rolling groove 12 of the curved track rail 1, in which FIG. 27 (a) is a side view and FIG. 27 (b).
FIG. 3 is a view showing a relationship between a grinding wheel and a ball rolling groove. This example is a grinding method when the radius of curvature of the ball rolling groove 12 is small.

As shown in FIG. 27A, the curved track rail 1 is fixed to a table 16 of a grinding machine via a mount 18 having an arc-shaped upper surface. Grinding of the ball rolling groove 12 is performed by a grindstone 14A, and grinding of the roller rolling surface 11a is performed by a grindstone 14B. That is, as shown in FIG. 27B, the inclination of the grinding wheel shaft 13A is set to NC so that the axis of the grinding wheel shaft 13A always faces the center O of the arc of the ball rolling groove.
Control. Then, the movement of the grindstone 14A is NC-controlled so that the grindstone 14A always moves on an arc having a predetermined curvature.
In this case, the cutting direction of the grindstone 14A is the horizontal direction. The smaller the diameter of the grindstone, the closer the ball rolling groove 12 can be to the set shape. On the other hand, the grindstone 14B is a work (track rail 1) or a grindstone 1 in a direction orthogonal to the paper surface.
With the movement of 4B, the grindstone shaft 13B moves vertically by NC control while maintaining the horizontal state. in this case,
A large grindstone 14B can be used, and the cutting direction of the grindstone 14B is a vertical direction.

In the embodiment shown in FIGS. 1 to 5 and the embodiments shown in FIGS. 17 and 18, the center of curvature is present above the curved track rail and the slide base in the vertical direction, and is convex downward. Although the embodiment having the ball rolling grooves described above has been described, the present invention relates to a type having a curved ball rail and a sliding center having a center of curvature below the vertical direction and a convex ball rolling groove above. Of course, it is applicable also to the thing of.

Further, in the embodiment, the curved track rail and the slide were described as being integrated, but the curved track rail and the slide were divided into two by the center line in the vertical direction.
Form a ball rolling groove on one side of each curved track rail piece,
A ball rolling groove may be formed in each sleeve of each slide base piece.
In this case, the curved track rail pieces may be fixed apart from each other. Further, each slide base piece is connected using a connecting member.

Further, in the embodiment, the example in which the ball transfer groove of the track rail and the slide table is ground is described, but the grinding finish may not be performed. That is, for the track rail, the rail body and the ball transfer groove may be integrally formed by cold drawing, and the grinding finish may be omitted. As for the slide table, after the slide table body is manufactured by cold drawing, the ball transfer groove may be formed by cutting, and the grinding finish may be omitted.

[0069]

As described above, according to the present invention, since the bending moment does not act on the slide table and the curved track rail due to the load of the load, even if the load is heavy, There is no deformation of the slide table and no curving of the curved track rail, so that it is possible to guide the arc motion in the vertical direction with high precision. Further, since a radial load can be supported by four rows of balls, or two rows of balls and two rows of rollers, a guide device having extremely high radial load capability can be provided. Therefore, a structure suitable for a seismic isolation device or the like that supports a building can be obtained.

Further, according to the present invention, the device can be constituted by a single curved track rail, a support for supporting the same, and a slide slidable on the curved track rail. The number of constituent elements can be minimized.

Further, according to the method of manufacturing a curved guide device of the present invention, arc-shaped ball rolling grooves formed on both sleeve portions of the slide table and both side surfaces of the curved track rail can be accurately ground. .

[Brief description of the drawings]

FIG. 1 is a side view showing an overall configuration of a first embodiment of a curve guide device according to the present invention.

FIG. 2 is a perspective view showing the overall configuration of the first embodiment of the curve guide device according to the present invention.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 1;

FIG. 5 is an enlarged view showing a relationship between a ball and a ball rolling groove formed on a curved track rail and a slide table of the present invention.

FIG. 6 is a graph showing the relationship between the ratio of the radius of curvature of the ball rolling groove to the ball and the differential slip ratio.

FIG. 7 is a graph showing the relationship between the ratio of the radius of curvature of the ball rolling groove to the ball and the differential slip ratio when the load is 50 kg.

FIG. 8 is a perspective view showing a ball rolling groove formed on the slide table of the present invention.

FIG. 9 is an explanatory view showing an example of a method of grinding a ball rolling groove of a slide table according to the present invention.

FIG. 10 is an explanatory view showing another example of the ball rolling groove grinding method of the slide table according to the present invention.

FIG. 11 is an explanatory view showing still another example of the method of grinding a ball rolling groove of a slide table according to the present invention.

FIG. 12 is an explanatory view showing still another example of the ball rolling groove grinding method of the slide table according to the present invention.

FIG. 13 is an explanatory view showing still another example of the ball rolling groove grinding method of the slide table according to the present invention.

FIG. 14 is an explanatory view showing still another example of the method of grinding a ball rolling groove of a slide table according to the present invention.

FIG. 15 is an explanatory view showing an example of a method of grinding a ball rolling groove of a curved track rail according to the present invention.

FIG. 16 is an explanatory view showing another example of a method of grinding a ball rolling groove of a curved track rail according to the present invention.

FIG. 17 is a sectional view of a second embodiment of the curve guide device according to the present invention.

FIG. 18 is a perspective view of a second embodiment of the curve guide device according to the present invention.

FIG. 19 is a perspective view showing a roller rolling surface and a ball rolling groove formed on the slide table of the present invention.

FIG. 20 is an explanatory view showing an example of a method of grinding a ball rolling groove of a slide table according to the present invention.

FIG. 21 is an explanatory view showing an example of a method of grinding a ball rolling groove of a slide table according to the present invention.

FIG. 22 is an explanatory view showing another example of a method of grinding a ball rolling groove of a slide table according to the present invention.

FIG. 23 is an explanatory view showing still another example of the ball rolling groove grinding method of the slide table according to the present invention.

FIG. 24 is an explanatory view showing still another example of the ball rolling groove grinding method of the slide table according to the present invention.

FIG. 25 is an explanatory view showing an example of a method of grinding a roller rolling surface of a slide table according to the present invention.

FIG. 26 is an explanatory view showing an example of a method of grinding a roller rolling surface and a ball rolling groove of a curved track rail according to the present invention.

FIG. 27 is an explanatory view showing another example of a method of grinding a roller rolling surface and a ball rolling groove of a curved track rail according to the present invention.

FIG. 28 is a perspective view showing the overall configuration of a conventional curve guide device.

FIG. 29 is a sectional view taken along the line XXIX-XXIX of FIG. 28;

FIG. 30 is a perspective view showing a ball rolling groove of a conventional slide base.

FIG. 31 is a sectional view showing another example of a conventional curve guiding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Curved track rail 2 Support 3 Slide 4 Ball 5 Side cover 6a Lower holding plate 6b Upper holding plate 8 Roller 11, 12, 21, 22 Ball rolling groove 11a, 21a Roller rolling surface 13 Grinding wheel shaft 14 Whetstone 16 Table 17 Jig 18 Mounting table

Claims (2)

[Claims] A curved track rail having a vertical curved surface with a predetermined curvature, a concave or convex upper surface, and a ball rolling groove formed on both sides along an arc having a predetermined curvature; A horizontal portion and a pair of sleeve portions hanging downward from both sides thereof, a concave portion on the lower surface side, and a predetermined curvature at both sleeve portions at positions corresponding to the ball rolling grooves of the track rail. A sliding table having a ball rolling groove formed along the arc of a circle and having a no-load ball hole formed adjacent to the ball rolling groove; A side cover having a ball direction changing passage on the inner surface side which connects the ball rolling groove and each end of the no-load ball hole to form a ball infinite circulation passage; and Circulates, and the ball rolling groove of the track rail and the ball of the slide table are circulated. Ball rolling grooves formed on both side surfaces of the curved track rail, the ball rolling grooves formed on both sides of the curved track rail are arranged in a row, Forming a roller rolling surface on which cylindrical rollers roll in parallel along with each other, and ball rolling grooves formed on both sleeves of the slide table are formed in a single row, and are formed in a horizontal portion of the slide table. A roller rolling surface is formed in parallel at a position corresponding to the roller rolling surface on the upper surface of the track rail on the lower surface along a circular arc having a predetermined curvature, and the ball and a contact point of a ball rolling groove opposed to each other are formed. A curved guide device, wherein a contact angle line to be connected is set at an angle of 30 ° with respect to a horizontal line. 2. The curve guide device according to claim 1, further comprising a support for supporting a lower surface of the curved track rail so as to maintain the curved track rail curved at a predetermined curvature.