JP2005083436A - Linear guide device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means for increasing grinding speed of a rail for engaging a rail cover covering an upper face of the rail of a linear guide device. <P>SOLUTION: This linear guide device is provided with the rail having a track channel on a side face, the rail cover covering the upper face of the rail, a saddle-like slider moving linearly on the rail, and a rolling body circulating in a connection path provided in the slider and rolling on an upper part track face and a lower part track face of the rail. An engaging face which is a slope enlarged in the direction of width of the rail from the upper part track face is formed in an upper part of the side faces on both sides of the rail, and the rail cover is engaged with the engaging face to simplify a side face shape of the rail. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a linear guide device used for linearly moving a moving table of a precision machine such as a manufacturing apparatus, a machine tool, or a measuring instrument.

In the conventional linear guide device, a connecting path is provided in a bowl-shaped slider, and a ball circulating in the connecting path is rolled to a raceway groove provided on a side surface of the rail so that the slider moves linearly on the rail. Engage a rail cover with a longitudinal edge bent at an angle of less than 90 degrees with the undercut provided on the upper side of the upper side of both sides of the rail to cover the upper surface of the rail, and provide it at the front and rear ends in the slider movement direction Intrusion of dust, cutting waste or the like is prevented by the seal (for example, refer to Patent Document 1).
Japanese Patent No. 2719985 (page 3, right column, line 25-page 4, right column, line 4, FIGS. 2 and 4)

In general, the raceway groove provided on the side surface of the rail is formed by grinding, and it is desirable to form the raceway groove and the side surface at once using a general-purpose grindstone in order to improve machining accuracy and reduce the number of machining steps.
However, in the conventional technology described above, a stepped undercut is provided at the upper part of the upper side surface of the rail to engage the rail cover, so it is necessary to form fine irregularities on the side surface of the rail. The overall grinding wheel must be shaped with fine irregularities, and it becomes difficult to increase the grinding speed in order to avoid the possibility of the fine irregularities being lost during the grinding process, resulting in reduced machining efficiency. There is a problem.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a means capable of increasing the speed of rail grinding for engaging a rail cover that covers the upper surface of the rail. To do.

  In order to solve the above problems, the present invention is provided with a rail having a raceway groove on a side surface, a rail cover that covers the top surface of the rail, a hook-shaped slider that linearly moves the rail, and the slider. In the linear guide device comprising a rolling element that circulates in the connecting path and rolls on the upper raceway surface and the lower raceway surface of the rail, on the upper part of the side surfaces on both sides of the rail, from the upper raceway surface to the rail. An engagement surface which is an inclined surface expanding in the width direction is formed, and the rail cover is engaged with the engagement surface.

  As a result, the present invention can simplify the shape of the grinding surface of the general-purpose grinding wheel that forms the side surface shape of the rail, facilitates high-speed grinding, and shortens the rail processing time. As a result, the processing efficiency can be improved.

  Embodiments of a linear guide device according to the present invention will be described below with reference to the drawings.

1 is a perspective view illustrating a linear guide device according to a first embodiment, FIG. 2 is a right half cross-sectional view taken along a line AA in FIG. 1, and FIG. 3 is an explanatory diagram illustrating a rail cover and a rail according to the first embodiment. 1 is a cross-sectional view taken along the line BB in FIG. 1, FIG. 5 is a front view showing the sealing body of the first embodiment, and FIG. 6 is a cross-sectional view taken along the line CC in FIG.
1 and 2, reference numeral 1 denotes a linear guide device.
Reference numeral 2 denotes a rail of the linear guide device 1, which is a long rod-like member having a substantially I-shaped cross-sectional shape made of a steel material such as alloy steel. A plurality of stepped bolt holes 3 for fixing the rail 2 are provided at a predetermined pitch.

Reference numeral 4 denotes a track groove, which is a substantially V-shaped groove formed along the longitudinal direction of the side surfaces on both sides of the rail 2, and is composed of an upper track surface 4a and a lower track surface 4b.
Reference numeral 5 denotes a slider, which is a bowl-shaped member made of a steel material such as alloy steel and having a substantially U-shaped cross-sectional shape, and a screw hole 5a is provided on the upper surface thereof. The moving table of the precision machine is fastened with bolts or the like.

The side walls 5b on both sides of the slider 5 are provided with connecting passages 7a and 7b having a rectangular cross section inclined at about 45 degrees for circulating the rollers 6 as rolling elements, and rails 2 are provided on both side surfaces inside the connecting paths 7a and 7b. The rolling part 8 which consists of rolling surface 8a, 8b etc. which opposes the upper raceway surface 4a and the lower raceway groove 4b of this raceway groove | channel 4 through the roller 6, respectively is formed.
The connecting path 7 a is a rolling path formed by the upper raceway surface 4 a of the raceway groove 4 of the rail 2 and the rolling surface 8 a of the rolling part 8 of the slider 5, and the coupling path 7 b is a lower part of the raceway groove 4 of the rail 2. The rolling paths formed by the raceway surface 4b and the rolling surface 8b of the rolling part 8 of the slider 5 are connected to each other, and each of the circulating rolling paths formed thereby has a plurality of rollers 6 and a predetermined number of rollers. An amount of lubricant, such as grease, is enclosed, and the roller 6 rolls while circulating. The same applies to the opposite side wall 5b. Thus, the slider 5 is supported on the rail 2 so as to be capable of linear reciprocation.

In the case where the connecting paths 7a and 7b and the rolling part 8 are provided on the slider 5, the slider 5 is manufactured by dividing it appropriately for manufacturing convenience, and is assembled by fastening means such as bolts. You may do it. In this case, the main body of the slider 5 may be made of steel, or may be made of a relatively soft metal material or resin material.
Reference numeral 9 denotes a holding plate, which is made of a metal material or a resin material, is fitted into the V-shaped groove 8c of the rolling portion 8 of the slider 5 and is fastened to the side wall 5b of the slider 5 by a bolt 10 to hold the roller 6. To prevent it from falling off.

  Reference numeral 11 denotes a rail cover, which is manufactured by a thin plate made of alloy steel or the like so as to have a length substantially equal to the length in the longitudinal direction of the rail 2, and as shown in FIG. It is bent at an angle α smaller than 90 degrees by processing or the like, and a space between the edge portions 11a on both sides is formed as a plane along the upper surface 2a of the rail 2. The rail cover 11 of this embodiment is formed by using a stainless steel plate having a thickness of 0.2 mm and bending the edges 11a on both sides thereof at an angle α = 70 degrees with an inner bend R of 0.5 mm.

  Reference numeral 12 denotes an engagement surface, and the width of the rail 2 extends upward from the upper raceway surface 4a of the raceway groove 4 at the upper part of the side surfaces on both sides of the rail 2 at a sandwich angle β larger than the angle α of the edge 11a of the rail cover 11. It is a slope that expands in the direction, and the edge 11a of the rail cover 11 is engaged by its elasticity. In this embodiment, the sandwiching angle β is formed to be approximately 80 degrees, and the top portion thereof is chamfered to C1 in order to avoid interference with the inner bending R of the edge portion 11a of the rail cover 11.

  When the rail cover 11 is mounted so as to cover the upper surface 2a of the rail 2, the rail cover 11 shown in FIG. Then, the edge 11a on the other side is expanded by its elasticity and engaged with the other engagement surface 12, and the rail cover 11 is attached to the rail 2 as shown in FIG. As a result, the rail cover 11 covers the entire upper surface 2a of the rail 2, and accumulation of dust, cutting debris, and the like in the stepped bolt hole 3 can be prevented.

Reference numeral 13 denotes an end cap which is made of a metal material, a resin material, or the like, and is fastened to the front and rear ends of the slider 5 in the moving direction by bolts or the like (not shown).
Reference numeral 14 denotes a seal body. As shown in FIGS. 5 and 6, a core metal 15 made of a plate material such as alloy steel and a seal rubber 16 formed on the core metal 15 with an elastic material such as natural rubber or synthetic rubber. It is comprised and it fixes to the seal attachment part 17 provided in the outer end surface of the end cap 13 by adhesion | attachment or press fit.

A lip portion 16a shown in FIG. 6 is provided on the rail 2 side of the seal rubber 16, and the lip portion 16a is arranged along a simple outer peripheral shape formed by a combination of straight lines formed by the rail 2 and the rail cover 11. 2 and the rail cover 11 constitute a contact-type seal that is in sliding contact with the outer peripheral surface.
In addition, the cross-sectional shape in the direction perpendicular to the surface of the outer peripheral surface of the seal body 14 of the present embodiment is the same shape as the cross-sectional shape shown in FIG. 6, and only the lengths of the core metal 15 and the seal rubber 16 covering it are different.

The side surface of the rail 2 including the engaging surface 12 and the chamfer at the top of the sandwiching angle β of the present embodiment is formed at a time by a general grinding wheel having a grinding surface in which both side surfaces correspond to the respective side surface shapes. To do. In this case, since the shape of the grinding surface of the general-purpose grindstone is a relatively simple shape having no fine irregularities, it is possible to prevent grinding of the general-purpose grindstone and easily perform high-speed grinding.
In this embodiment, the case where the upper surface 2a of the rail 2 is installed in the horizontal direction has been described as an example, but the same applies to the case where the upper surface 2a is installed in the vertical direction or inclined.

Moreover, although the top part of the sandwiching angle β of the engagement surface 12 has been described as being chamfered, the top part of the sandwiching angle β is not limited to chamfering, and may be another mode illustrated in FIG.
That is, if the shape of further applying fillet R to the chamfered corner shown in FIG. 7A or the shape of applying fillet R instead of the chamfering shown in FIG. It is possible to prevent the occurrence of dents, scratches, and the like at the top when the rail 2 is handled.

  As described above, in this embodiment, an engagement surface that is an inclined surface that expands in the width direction of the rail upward from the upper raceway surface of the raceway groove is provided on the upper part of both side surfaces of the rail of the linear guide device, By engaging the edge of the rail cover with this engagement surface by its elasticity, the side shape of the rail can be simplified, and the shape of the grinding surface of the overall grinding wheel forming this can be simplified. Thus, high-speed grinding can be easily performed, and the processing time of the rail can be shortened and the processing efficiency can be improved.

  In addition, since the seal body is slidably brought into contact with the simplified outer peripheral surface formed by the rail and the rail cover to form the contact seal, the lip portion of the seal body can be easily formed. Can be manufactured at a low cost, and sufficient dustproof performance against intrusion of dust, cutting waste, etc. can be obtained.

FIG. 8 is a partial cross-sectional view showing a rail and a rail cover according to the second embodiment.
In addition, the same part as the said Example 1 attaches | subjects the same code | symbol, and abbreviate | omits the description.
Reference numeral 21 denotes a skirt, which is a portion that does not contribute to the engagement of the edge portion 11a of the rail cover 11 below the engaging portion 12 on both sides of the rail 2 as a vertical plane.
The engagement surface 12 of this embodiment is formed in the same shape as that of the first embodiment from the upper raceway surface 4 a of the raceway groove 4 via the skirt 21.

The rail cover 11 can be attached to the engagement surface 12 formed in this manner in the same manner as in the first embodiment. The rail cover 11 covers the entire upper surface 2a of the rail 2 and a stepped bolt hole. It is possible to prevent accumulation of dust, cutting waste, and the like on 3.
Moreover, the side surface shape of the rail 2 can be a relatively simple shape that does not have fine irregularities even if the skirt portion 21 is provided.

Such a relatively simple shape has an inclined surface shown in FIG. 9 in which the skirt 21 is extended downward from the engaging surface 12 at an obtuse angle in the width direction of the rail, and the width direction of the rail at an obtuse angle downward from the engaging surface 12. It can also be formed by forming the inclined surface shown in FIG.
Thereby, even if it provides an engagement surface via a skirt part, the side shape of a rail can be simplified and the effect similar to the said Example 1 can be acquired.

  Further, if the skirt shown in FIGS. 8 and 9 is formed, the upper raceway surface can be widened, larger rollers can be used, and the load capacity and rigidity of the linear guide device can be increased. it can.

The perspective view which shows the linear guide apparatus of Example 1. FIG. The right half sectional view of the AA section line of FIG. Explanatory drawing which shows the rail cover and rail of Example 1. BB sectional view of FIG. The front view which shows the seal body of Example 1. CC sectional view of FIG. The fragmentary sectional view which shows the other aspect of the top part of the engaging surface of Example 1. FIG. The fragmentary sectional view which shows the rail and rail cover of Example 2 The fragmentary sectional view which shows the other aspect of the skirt part of Example 2. The fragmentary sectional view which shows the other aspect of the skirt part of Example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Linear guide apparatus 2 Rail 2a Upper surface 3 Stepped bolt hole 4 Track groove 4a Upper track surface 4b Lower track surface 5 Slider 5a Screw hole 5b Side wall 6 Roller 7a, 7b Connection path 8 Rolling part 8a, 8b Rolling surface 8c V Slot 9 Holding plate 10 Bolt 11 Rail cover 11a Edge 12 Engagement surface 13 End cap 14 Seal body 15 Core metal 16 Seal rubber 16a Lip part 17 Seal attachment part 21 Bottom part

Claims (2)

A rail having a track groove on a side surface, a rail cover that covers the top surface of the rail, a hook-shaped slider that moves linearly on the rail, and an upper track surface of the rail that circulates through a connecting path provided in the slider And a linear guide device comprising rolling elements that respectively roll on the lower raceway surface,
An engaging surface that is an inclined surface that expands in the width direction of the rail from the upper raceway surface is formed at the upper part of the side surfaces on both sides of the rail, and the rail cover is engaged with the engaging surface. Linear guide device. In claim 1,
The linear guide device characterized in that the engagement surface is formed from the upper raceway surface through a skirt.