JP2000170760A - Linear motion guiding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear motion guiding device having a rust-resistant guiding rail on its entire surface. SOLUTION: A linear motion guiding bearing device 1 serving as a linear motion guiding device is provided with a guiding rail 3 and a slider. The guiding rail 3 is formed by extending in the unidirection. Both the right and left side 23, 24 of the guiding rail 3 form a rolling groove 5 for a rolling element and a recessed side part 20, respectively. Each rolling groove 5 for the rolling element is provided with a recessed groove 27 for a retainer recessedly formed from the groove bottom. The guiding rail 3 is provided with a chamfer part 21 on both the right and left end of the bottom part, respectively. The guiding rail 3 is obtained through; heat treatment application to its base material 28; grinding machining application to the upper and the lower surface 25, 26, respectively; simultaneous grinding application to the sides 23, 24 and the rolling groove 5 for the rolling element by means of first integrally formed grinding wheels 31 with each other; and removal application, including grinding to the recessed side parts 20, the chamfer parts 21, and the grooves 27 for the retainer, and the like.

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 as a linear guide in machine tools, industrial machines, and the like.

[0002]

2. Description of the Related Art A linear motion guide bearing device as a linear motion guide device used as a linear guide or the like in a machine tool, an industrial machine, or the like has a guide rail 53 as a guide member extending in one direction shown in FIG. A slider movably provided on the rail 53 along the longitudinal direction.

As shown in FIG. 5, the guide rail 53 has a rolling element rolling groove 56 and a chamfered portion 57. The rolling element rolling groove 56 is formed on each of the side surfaces 54 and 55 of the guide rail 53 so as to extend in the longitudinal direction. The rolling element rolling grooves 56 are formed at two locations on each of the side surfaces 54 and 55, for a total of four locations.

[0004] Of the rolling element rolling grooves 56 provided on the side surfaces 54 and 55, respectively, the rolling element rolling grooves 56 located above.
Are provided over the upper surface 58 and the side surfaces 54 and 55 of the guide rail 53, and the rolling element rolling grooves 56 located below
Are formed concavely from the side surfaces 54 and 55. Side 54,
At the groove bottom of the rolling element rolling groove 56 formed concavely from 55,
A retainer groove 59 is provided which is recessed from the groove 56.

The chamfered portion 57 is formed at each of the left and right ends of the bottom of the guide rail 53 so as to extend in the longitudinal direction.

The slider is provided with load rolling element rolling grooves opposed to the rolling element rolling grooves 56 of the guide rail 53, respectively. Furthermore, the slider includes a rolling element return path substantially parallel to the load rolling element rolling groove, and a curved path connecting the load rolling element rolling groove and the rolling element return path.

The above-described load rolling element rolling groove and guide rail 5
The rolling element rolling groove 56, the rolling element return path, and the curved path of No. 3 form a rolling element circulation path. A plurality of balls are loaded in the rolling element circulation path. The ball is held by a retainer so that the ball does not fall off when the slider is pulled out of the guide rail 53. When the ball rolls on the above-mentioned groove or the like, the slider is movable along the longitudinal direction of the guide rail. The retainer passes through the retainer groove 59 when the ball rolls on the rolling element rolling groove.

When manufacturing the guide rail 53, for example, heat treatment such as induction hardening is applied to the base material 60 to harden the surface of the rolling element rolling groove 56 and the like. Then, top 5
8 and the lower surface 61 are subjected to grinding, etc.
5 and the rolling element rolling groove 56 are simultaneously subjected to grinding and the like.

On the other hand, Japanese Patent Application Laid-Open No. Hei 4-370415 also discloses a method of manufacturing the guide rail 53. In the method described in Japanese Patent Application Laid-Open No. 4-370415, for example, after a heat treatment such as induction hardening is applied to the base material 60, the side surfaces 54 and 55, the rolling element rolling grooves 56 and the retainer grooves 59 are simultaneously formed. Grinding etc. are performed.

[0010]

However, after grinding the upper surface 58 and the lower surface 61 described above, the side surfaces 54,
In the conventional method for manufacturing the guide rail 53 in which the grinding is performed on the rolling element 55 and the rolling element rolling groove 56, the chamfered portion 57 and the retainer groove 59 are not ground. For this reason, the scale made of iron oxide or the like generated during quenching remains attached to the chamfered portion 57 and the retainer groove 59.

On the other hand, in the method described in Japanese Patent Laid-Open No. Hei 4-370415, the groove 59 for the cage is ground, but the chamfered portion 57 is not ground.
The scale made of iron oxide or the like generated when heat treatment such as quenching is performed remains on the chamfered portion 57.

As described above, in the guide rail 53 obtained by the conventional manufacturing method, even if the base material 60 is made of stainless steel or other stainless steel, the scale generated by the heat treatment remains without being removed. . For this reason, for example, when used in a machine tool driven in a corrosive atmosphere such as a semiconductor manufacturing device and a battery manufacturing device,
There has been a problem that rust is likely to be generated from the remaining portion without removing the scale. This is because the passivation film of stainless steel is destroyed when heat treatment such as induction hardening is performed, and the scale described above is relatively easily rusted.

For example, as shown in FIG. 6, a portion Y indicated by a parallel oblique line S2 in FIG.
When quenching such as induction quenching as a heat treatment is performed on 1, the surface other than the portion Y1 indicated by the oblique parallel line S2 in FIG. I have. On the other hand, a portion Y1 indicated by a parallel oblique line S2
Is covered with scale generated during the heat treatment, so that it is easily rusted. In particular, when induction hardening is performed in the atmosphere, the scale is remarkably formed, so that it becomes very easy to rust.

The guide rail 53 obtained by the above-mentioned conventional manufacturing method has a problem that scale is left on at least a part of the surface, and rust is easily generated from the portion where the scale remains.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a linear motion guide device provided with a guide rail which is hardly rusted on the entire surface.

[0016]

In order to solve the above-mentioned problems and to achieve the object, a linear motion guide device according to the present invention comprises a guide member extending in one direction, and the guide member is movable along the guide member. And a slider provided in the linear motion guide device, wherein the guide member is subjected to heat treatment on the base material, and then the scale formed during the heat treatment is removed over the entire surface of the base material. It is characterized by that.

In this linear motion guide device, after the guide member is subjected to a heat treatment to the base material, the scale formed when the heat treatment is performed is removed over the entire surface of the base material. As described above, since the relatively rust-prone scale is removed from the entire surface, the rust is hardly rusted.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

For example, for a machine tool or an industrial machine used in a corrosive atmosphere such as a semiconductor manufacturing device or a battery manufacturing device, a linear guide bearing as a linear motion guide device shown in FIG. The device 1 may be used.

As shown in FIG. 1, a linear motion guide bearing device 1 is made of stainless steel such as stainless steel and has a guide rail 3 as a guide member extending in one direction. 3 is provided with a slider 4 and the like movably assembled along the longitudinal direction.

As shown in FIG. 2, the guide rail 3 includes a rolling element rolling groove 5 as a rolling groove, a side recess 20 and a chamfer 21. The rolling element rolling grooves 5 are respectively formed on the left and right side surfaces 23 and 24 of the guide rail 3. The rolling element rolling grooves 5 are arc-shaped grooves extending in the longitudinal direction of the guide rail 3. Is formed.

In this embodiment, the rolling element rolling grooves 5 are formed at two places on each of the left and right side surfaces 23 and 24 of the guide rail 3, that is, at four places in total. These rolling element rolling grooves 5 are formed substantially parallel to each other. Side 2
Of the rolling element rolling grooves 5 formed on each of the rolling elements 3 and 24, the rolling element rolling grooves 5 positioned above extend over the side faces 23 and 24 and the upper surface 25 of the guide rail 3.
24 and the upper surface 25 are formed concavely. The rolling element rolling groove 5 located below is provided on the side surfaces 23 and 24 and is formed to be concave from the side surfaces 23 and 24.

The side recess 20 is formed on each of the left and right side surfaces 23 and 24 of the guide rail 3. Side recess 20
Are respectively formed along the longitudinal direction of the guide rail 3 and are formed to be concave from the side surfaces 23 and 24 of the guide rail 3.

The chamfers 21 are formed at both left and right ends of the bottom of the guide rail 3. The chamfer 21
Each of the guide rails 3 is formed into a shape in which the bottom of the guide rail 3 is chamfered.
Is formed.

The slider 4 includes a slider main body 6 having a U-shaped cross section and plastic end caps 7 attached to both ends of the slider main body 6. Also,
From the side close to the end cap 7, the end cap 7
A reinforcing plate 12, a lubricant-containing member 13, and a side seal 14 made of nitrile rubber or the like as a plate-like member are attached in a superposed state.

The slider body 6 includes a load rolling element rolling groove,
A rolling element return path is provided. Load rolling element rolling groove
A plurality of rolling element rolling grooves 5 are formed on the inner side surfaces of both skirts of the slider body 6 so as to face each. The rolling element return path is provided at the thick portions of both skirts of the slider body 6 with the rails 3.
And is provided substantially parallel to each of the load rolling element rolling grooves.

Each of the end caps 7 has a curved path (not shown) that connects the load rolling element rolling groove of the slider body 6 to the rolling element return path. The rolling element rolling groove 5, the load rolling element rolling groove, the rolling element return path, and the curved path of the above-mentioned guide rail 3 form a rolling element circulation path. A large number of spherical balls as rolling elements made of, for example, steel or ceramics are loaded in the rolling element circulation path.

These balls are free to roll on the rolling element rolling grooves 5 and the like. These balls roll on the rolling element rolling grooves 5 and circulate in the rolling element circulation path, so that the slider 4 can move freely in the longitudinal direction of the guide rail 3. These balls are held by a retainer so as not to fall off when the slider 4 is pulled out of the guide rail 3.

As shown in FIG. 2, the rolling element rolling grooves 5 formed concavely from the side surfaces 23 and 24 of the guide rail 3 are respectively formed concavely from the rolling element rolling grooves 5. The retainer groove 27 is provided. The retainer groove 27 is
When the ball circulates in the rolling element circulation path, the retainer is formed to have a size that allows the ball to pass with play.

When manufacturing the guide rail 3 having the above-described structure, a material made of stainless steel such as stainless steel is subjected to plastic working or the like to obtain a base material 28 made of stainless steel or the like. Thereafter, the base material 28 is subjected to quenching such as induction hardening as a heat treatment, and the upper surface 25 and the lower surface 26 are subjected to grinding. FIG. 2 shows a grindstone 30 for grinding the lower surface 26.

Thereafter, the side surfaces 23 and 24 and the rolling element rolling grooves 5 are simultaneously ground by using the first integrated grindstone 31 shown in FIG. The first integrated grindstone 31 includes a side contact portion 32 and a rolling groove contact portion 33, respectively. The side contact portions 32 are provided on the side surfaces 23 and 24 of the guide rail 3.
Abut. The rolling groove contact portion 33 is formed so as to protrude from the side surface contact portion 32, opposes the rolling element rolling groove 5, and engages with the rolling element rolling groove 5. First integrated whetstone 31
According to the above-described configuration, the side contact portion 32 grinds the side surfaces 23 and 24 of the guide rail 3 and
The rolling groove contact portion 33 performs a grinding process on the rolling element rolling groove 5.

The side recess 20, the chamfered portion 21 and the groove 27 for the retainer are cut, ground, honed, polished with a sandpaper or a wire brush, and pickled with an acid having an oxidizing action such as nitric acid. Of any of these processes, or a process combining a plurality of these processes.

The guide rail 3 of the present embodiment described above
May or may not be provided with the side recess 20. When the side recess 20 is not provided, it is not necessary to perform the above-described processing on the side recess 20.

According to the linear guide bearing device 1 of the present embodiment, the guide rail 3 is formed by quenching the base material 28 such as induction hardening as a heat treatment, and then the upper and lower surfaces 25 and 26, the side surfaces 23 and 24, The rolling element rolling groove 5, the side surface concave portion 20, the chamfered portion 21, and the retainer groove 27 are subjected to removal processing such as grinding. Therefore, the scale made of iron oxide or the like formed on the surface of the base material 28 by quenching is removed from the entire surface of the guide rail 3. As described above, since the relatively rust-prone scale is removed, the guide rail 3
Is hardly rusted on the entire surface.

Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the guide rail 3 of the linear motion guide bearing device 1 of the present embodiment, only one rolling element rolling groove 5 is formed on each of the left and right side surfaces 23 and 24 at a total of two places. The rolling element rolling groove 5 is formed to be concave from the side surfaces 23 and 24, respectively, and forms a retainer groove 27 at the groove bottom.

When manufacturing the guide rail 3 of this embodiment, a material made of stainless steel such as stainless steel is subjected to plastic working or the like to obtain a base material 28 made of stainless steel or the like. Thereafter, the base material 28 is subjected to quenching such as induction hardening as a heat treatment, and first, the upper surface 25 and the lower surface 26 are subjected to grinding.

Thereafter, the side surfaces 23 and 24, the rolling element rolling grooves 5, the side surface concave portions 20 and the retainer grooves 27 are simultaneously subjected to grinding using the second integrated grindstone 41 shown in FIG.
Each of the second integrated whetstones 41 has a side contact portion 4
2, a rolling groove contact portion 43, a side recess contact portion 44, and a cage groove contact portion 45 are integrally provided.

The side contact portions 42 contact the left and right side surfaces 23 and 24 of the guide rail 3. The rolling groove contact portion 43 is formed so as to protrude from the side surface contact portion 42, faces the rolling element rolling groove 5, and engages with the rolling element rolling groove 5. The side recess contact portion 44 is formed so as to protrude from the side contact portion 42, opposes the side recess 20, and engages with the side recess 20. The retainer groove contact portion 45 is provided with the rolling groove contact portion 43.
, And is opposed to the retainer groove 27 and engages with the retainer groove 27.

The second integral grindstone 41 has the above-described configuration, and the side contact portion 42 has the side surfaces 23 and 2 of the guide rail 3.
4 is subjected to grinding, the rolling groove contact portion 43 is subjected to grinding to the rolling element rolling groove 5, and the side recess contact portion 44 is subjected to the side recess 2.
0 is subjected to grinding, and the cage groove contact portion 45 performs grinding to the cage groove 27.

The chamfered portion 21 may be removed by any of cutting, grinding, honing, polishing using sandpaper or a wire brush, pickling with an acid having an oxidizing action such as nitric acid, or the like. , A process in which a plurality of processes are combined is performed.

In the linear guide bearing device 1 of this embodiment, similarly to the first embodiment, the guide rail 3 has a scale made of iron oxide or the like formed on the surface of the base material 28 by quenching. Has been removed. As described above, since the relatively rust-prone scale is removed, the guide rail 3
Is hardly rusted on the entire surface.

Further, the guide rail 3 of the linear motion guide bearing device 1 of the first and second embodiments described above has the rolling element rolling groove 5 at the center as shown by a parallel oblique line S1 in FIG. Induction hardening may be performed only on the portion Y. In this case, FIG.
The surface other than the portion Y indicated by the oblique parallel line S1 is the base material 28.
The rust resistance of stainless steel such as stainless steel is maintained. Therefore, the surface of the portion Y indicated by the parallel oblique lines S1 in FIG. 4 subjected to the induction hardening or the like need only be subjected to the removal processing such as the above-described grinding processing.
It is not necessary to perform a removal process such as a grinding process on the surface other than the portion Y shown in FIG. When performing the grinding process, it goes without saying that the first or second integrated grindstones 31 and 41 described above may be used.

[0044]

According to the present invention, after the guide member is subjected to the heat treatment, the scale formed when the heat treatment is performed is removed over the entire circumference of the base material. Therefore, since the relatively rust-prone scale is removed, the entire surface is hardly rusted.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a linear motion guide bearing device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the guide rail of the embodiment, a first integrated grindstone for grinding the guide rail, and the like.

FIG. 3 is a cross-sectional view showing a guide rail according to a second embodiment and a second integrated grindstone for performing a grinding process on the guide rail.

FIG. 4 is a diagram showing an end face of a guide rail as a modification of the first and second embodiments.

FIG. 5 is a sectional view showing a guide rail of a conventional linear guide bearing device.

FIG. 6 is a view showing an end face of a guide rail of a conventional linear guide bearing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1: Linear guide bearing device (linear motion guide device) 3: Guide rail (guide member) 4: Slider 28: Base material

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Minori Mizumura 78 Toba-cho, Maebashi-shi, Gunma F-term (reference) in NSK Ltd. 3J104 AA03 AA23 AA34 AA64 AA69 AA74 AA76 BA05 CA20 DA20 EA01 EA04

Claims (1)

[Claims] 1. A linear motion guide device comprising: a guide member extending in one direction; and a slider provided on the guide member so as to be movable along the guide member. After the heat treatment, the scale formed during the heat treatment is removed over the entire surface of the base material.