JPH0729251B2 - Thin XY table - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used at a crossing portion between a column and a cross rail such as a boring machine or a planing machine, or at a crossing portion between a vertical axis and a horizontal axis of a general conveying device to support a heavy object. And a thin XY table that slides.

[0002]

2. Description of the Related Art Conventional linear motion ball bearings ("Applied mechanical engineering", published by Taiga Publishing Co. on December 1, 1969)
What is used as a December issue, page 101 cut photograph) is to form a crossed upper and lower bearing block, and fit ball bushes to the front and rear ends of the bearing block, and to attach the shaft to the ball bush. It is inserted.

However, since the outer shape of the bearing block is cylindrical, it is impossible to set a flat table directly.

Further, the shaft inserted into the ball bush has a point contact and has a load capacity for a vertical load which is not so large, but it is used at a position where the rotational torque acts to move the shaft forward and backward. It cannot be done.

In short, the linear motion ball bearing shown in the above photograph has a small allowable load and is suitable for simple linear motion with low rigidity, but its own weight, such as a machine tool column and a tool rest on a cross rail, is very large. When a large force acts in the upward direction, the downward direction, or the horizontal direction during cutting, the ball and the shaft cannot be supported by point contact.

Further, during the cutting process, a twisting moment or the like acts on a point far away from the tool post plate,
A large lifting load is applied to the shaft, which causes chattering due to lack of rigidity and lack of applied load, making it unable to withstand long-term use.

Moreover, since the left and right ball bushes are incorporated in the upper bearing, an eccentric load is induced by misalignment and twisting, and the life of the bearing is significantly shortened.

The present inventor has developed a crossed linear bearing in order to solve the above-mentioned drawbacks. The gist is that the bearing main body is formed thick, and the raceway grooves in which the raceways are fitted are respectively provided on the upper surface and the lower surface of the main body in a direction crossing each other, and one raceway is formed on the inner side surface of each raceway groove. Grooves are formed on both shoulders of the base to complement each other with rolling grooves of the loaded balls to form four load tracks, and grooves are formed on both sides of the grooves to form return tracks for the unloaded balls. Are cut to form four endless tracks, and the balls located in these grooves are supported in the track grooves by a retainer, and the load balls located in the four load tracks support the loads in all directions. It is a cross linear bearing configured as described above (see Japanese Patent Publication No. 54-32888).

However, since the bearing forms four load raceways and four return races for unloaded balls, it is inevitably thick as a whole and cannot be installed in a narrow space.

The present inventor has also developed a cross linear bearing unit (see Japanese Patent Publication No. 57-40372).

The gist of the invention is to provide a bearing main body provided with a raceway groove and a rail hole intersecting with each other, a raceway which is fitted in the raceway groove through a ball and a retainer, and provided on both shoulders of the raceway. Load rolling groove and recessed portions provided on both side surfaces of the track way, a slide table mounted at a required position of the track way, and the rail hole penetrating the bearing body. A rail fitted through a ball and a retainer, three projections provided on the outer circumference of the rail and rolling grooves for loading provided on both side surfaces of the projection, and a shoulder portion of the raceway. A row of load balls arranged corresponding to the load ball guide groove formed in the raceway groove, a no-load ball guide groove formed in the raceway groove corresponding to the upper end surface of the raceway and the recessed portion. Rows for unloaded balls arranged in correspondingly formed unloaded ball guide grooves, Characterized by comprising a row of load balls and a row of unloaded balls arranged on both sides of the loaded ball guide groove and the unloaded ball guide groove provided alternately in the circumferential direction in the rail hole and in the axial direction. It is in a cross linear bearing unit.

In the cross linear bearing unit, by changing the area where the balls under load contact the groove forming the load track of the bearing block body and the rolling groove of the rail from the point contact type to the line contact type, Since all the load applied in the radial direction of the bearing can be applied and the contact area between the ball and the groove is large, the load capacity can be enhanced.

Further, since the space between the track and the track, in which the track groove and the track hole are respectively fitted directly in the same bearing block body, can be made as small as possible, the whole is made compact and the part further separated from the bearing. It has the effect of being able to sufficiently support the action from.

[0014]

However, one of the same bearing block bodies has a spline shaft rail hole,
On the other hand, since the load ball grooves of the raceway shaft are formed in double rows, the wall thickness increases in proportion to the diameter of the spline shaft.
In addition, the bearing block body also becomes thicker in proportion to the diameter of the crossing side, that is, the raceway shaft on the opposite side, and when the top and bottom are matched, the minimum distance between the raceway and the rail must be maintained in terms of strength. .

Since such a bearing block body is set above and below and to the left and right of the table of the machine tool, the material and machining cost are large and the cost is inevitable. Further, since it has a considerable thickness, the column and the like also have a defect that must be sturdy.

The technical problem of the present invention is that the bearing block body is formed in a cross girder shape and the common plate is formed integrally with the cross girder-shaped bearing block body. Since the rigidity of is held in the horizontal part of the side wall, a thin XY table can be realized as a whole, the weight of the whole can be reduced, and the inertial force of the table can be suppressed to a small value. , It is to be able to sufficiently adapt to even faster movements.

[0017]

The constitution of the present invention for solving the above technical problems, that is, the technical means is as follows.
The bearing block body is formed in a cross beam shape,
A plate common to the upper and lower sides is integrally formed on the cross-shaped bearing block body, and left and right side walls are formed so as to cross each other with the plate sandwiched therebetween. A ball guide groove is formed, and a no-load ball guide hole is formed in parallel with the load ball guide groove so as to penetrate the side wall. Tables having raceway grooves are slidably fitted through balls, and side lids having ball guide U-grooves formed on their inner surfaces are provided at both ends of the bearing block so that the tables can move. Thin X characterized by being arranged
It's on the Y table.

[0018]

By the above-mentioned technical means, the cross-shaped bearing block body of the thin XY table of the present invention is formed in such a shape that it has a substantially U-shaped cross section having a plate common to the upper and lower sides and is held at the horizontal portion of the side wall. Therefore, the wall thickness can be made thin, and the inertial force generated by the horizontal and vertical shift of the thin XY table can be reduced.

Further, since the bearer ring block body having the plate common to the upper and lower sides is made so wide as to have a thin wall thickness, it is possible to prevent the processing strain in the left and right and up and down grinding, that is, the twisting in the axial direction. It is possible and the desired accuracy can be sufficiently improved.

Also, since the bearing block body is as wide as the above table, it is possible to grind the guide grooves for the load balls at the same time on the left and right by using a large grinding wheel, which further improves work efficiency and helps reduce costs. The function and effect peculiar to the present invention can be obtained in which the accuracy can be easily obtained.

Since a thin common plate is thinly formed between the side walls of the bearing block body formed in the shape of a cross girder, the bearing block body can be reinforced and the weight can be reduced at the same time. is there.

[0022]

An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 6, 10.11 is a steel material or a composite material having equivalent strength, or a substrate made of a thermoplastic material obtained by heat-treating a polyacetal resin or the like is formed in a double cross pattern to sandwich a common plate B, The upper surface and the lower surface of the table, which are formed between the left and right side walls 24 to 27 so as to intersect with each other at right angles to the upper and lower sides thereof,
And the left and right inner side walls 12.13.1 of the rising of the lower surface 11
Guide groove for load ball 16.17.18.19 in 4.15
Are formed, and then the left and right side walls 24.25.26.
Guide holes 20 for unloaded balls formed penetrating through 27.
21.22.23 is the load ball guide groove 16.1.
The bearing block body A having a cross beam shape is formed by being formed in parallel with 7.18.19 at a required interval.

28.29.30.31 is a side cover made of metal or non-ferrous metal, for example, synthetic resin material such as polyacetal resin, nylon resin, and the like, the guide hole 20.21.22.23 for the unloaded ball and the loaded ball. Guide groove 16.1
The side lid 28.29.3 is used to connect between 7.18.19.
When the ball guide U groove 32 is formed on the inner surface of 0.31, the tongue pieces 33 are formed on the side facing the loaded ball guide groove.

34.35 is a side lid 28.29.30.31
A through hole for a mounting bolt formed in the hole, which is countersunk for the bolt head portion.

36.37 is a female screw formed on the right and left side walls 24.25.26.27 side of the bearing block main body A having a cross shape, and the position of the female screw 36.37 is the side lid 28.29.30. Corresponds to the bolt through hole 34.35 of 31 and fits at the time of assembly.

Reference numeral 38 designates a side cover 28.29.30.3 on the left and right side walls 24.25.26.27 of the bearing block body A.
It is a bolt for attaching 1.

Reference numeral 401.402 is a table made of a steel material similar to the substrate, a composite material having equivalent strength, or a heat-treated thermoplastic material.
01.402 is wide enough to slidably slide on the upper surface 10 and the lower surface 11 of the plate B of the bearing block body A via balls 41, and the thickness of the lower table 402 of the bearing block body A is Both side walls 24.
It projects slightly below 25.26.27, and the upper table 401 projects upward.

42.43 is a load ball raceway groove formed on the left and right of the outer wall of the table 401.402. The load ball raceway groove 42.43 is the load ball guide groove 16 of the bearing block body A. It is formed in parallel with 17.17.18.

In the drawing, reference numeral 44 is a load ball row consisting of a plurality of balls 41 between the load ball guide groove of the bearing block body A and the load ball raceway groove of the table 401.402, and 45 is no load of the bearing block body. An unloaded ball row consisting of a large number of balls 41 in the ball guide holes 20-23, 46.46. ． Is a through hole for fixing the lower table 402 at a predetermined position via a set bolt, and 47 is a through hole for fixing necessary articles and the like on the upper table 401 via the set bolt.

[0030]

As described above, the lower table 402 assembled into the bearing block body A in the shape of a double girder via the balls 41 is fixed to a required place of a machine tool or the like via the set bolt, and the upper table is fixed. Necessary articles and the like are fixed to 401.

A drive mechanism such as a ball screw (not shown)
When the bearing block main body A is moved upward and downward through the balls, the balls 41 in both grooves and in the guide holes are moved through the side lids 30.31 as shown by arrows in FIG. It smoothly rolls from the loaded ball row 44 to the unloaded ball row 45 or in the opposite direction.

Next, when the upper table 401 is moved in the left-right direction, the balls 4 in both grooves and in the guide hole are moved.
1 smoothly moves from the loaded ball row 44 to the unloaded ball row 45 via the side lid 28.29, or in the opposite direction.

As described above, the thin XY table of the present invention and the plate B common to the upper and lower sides are formed so as to be held together at the horizontal portions of the side walls having a substantially U-shaped cross section and having rigidity. In addition, the inertial force generated by the movement of the table can be minimized.

Further, since the upper and lower tables of the present invention are formed wide, the through holes for the set bolts can be formed on both sides, so that the lower table is fixed and the upper table is fixed with articles and the like. It is possible to achieve the action and effect peculiar to the present invention, such as reliably.

Although the bearing body of the thin XY table is described as a type that does not use a retainer, it is of course possible to use a retainer.

[Brief description of drawings]

FIG. 1 is a perspective view of a main bearing body of a thin XY table according to the present invention.

FIG. 2 is a partial cross-sectional plan view of the thin XY table of the present invention.

FIG. 3 is a partial cross-sectional front view showing a state in which a side lid below the thin XY table of the present invention is removed.

FIG. 4 is an enlarged view of an essential part showing a state in which a side cover is attached.

FIG. 5 is a cross-sectional view of a ball guiding U groove.

FIG. 6 is a perspective view of a side cover.

[Explanation of symbols]

 10.11: Upper and lower surfaces of plate B 12-15: Inner side wall 16-19: Load ball guide groove 24-27: Side wall 28-31: Side lid A: Bearing block body B: Plate 32: Ball guide U Groove 401: Upper table 402: Lower table

Claims (1)

[Claims] 1. A bearing block main body is formed in a cross beam shape, and a plate common to the upper and lower sides is integrally formed on the cross girder-shaped bearing block main body, and left and right side walls cross each other vertically with the plate sandwiched therebetween. And a guide groove for the load ball is formed inside the side wall so as to face each other, and a guide hole for the non-load ball is formed to penetrate the side wall in parallel with the guide groove for the load ball. Further, between the side walls, a table having a raceway groove for a load ball formed on an outer side wall is slidably fitted through balls, and a ball guide is provided on an inner surface so that the table can move. A thin XY table, characterized in that side covers having U-grooves are provided at both ends of the bearing block body.