JPH08232963A - Abrasion resistance roller bearing - Google Patents

Abstract

PURPOSE: To improve abrasion resistance of an outer ring, to improve longevity of a bearing and to adopt them to a bearing for rolling of an edge mirror plate presser device, various kinds of rollers for transport and a bearing used as a guide roller, etc. CONSTITUTION: A tool steel steel material us used for a material of a part 8b constituting an outside diametrical surface of an outer ring 8 on a rolling bearing having the outer ring 8 and a rolling element 6. This outside diametrical surface constituting part 8b is made of a sleeve, etc. It is possible to use an alloy tool steel material, a carbon tool steel material, a high speed tool steel material, etc., and the alloy tool steel material is favourable. An ordinary bearing steel, etc., are used for an outer ring main body 8a. In case of applying it to a bearing for rolling of an edge mirror plate presser device, it is made as a double row tapered roller bearing with a seal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wear-resistant rolling bearing used as a roller bearing for an edge mirror plate pressing device, various conveying rollers, a guide roller or the like.

[0002]

2. Description of the Related Art Conventionally, in a pressing device for a plate material such as an edge mirror plate shown in FIG. 5, a double row tapered roller bearing with a seal shown in FIG. 6 is used for the upper and lower rolls 1 for pressing the plate material W. The pressing device of FIG. 5 constitutes an edge cutting device that cuts the mill edge of a plate material W made of a rolled strip or the like with a cutter 2, and has a large number of lower rolls arranged in a row at a predetermined height. 1 and an upper roll 1 arranged in parallel above each of the lower rolls 1. A plurality of adjacent lower rolls 1 are roll support bases 3.
A plurality of adjacent upper rolls 1 are installed on the roll support member 4 and are pressed downward together with the roll support member 4 by a pressure device such as a hydraulic cylinder 5. The roll supporting member 4 is installed in a guide frame (not shown) so as to be able to move up and down. The bearing shown in FIG. 6 includes double-row tapered rollers 6 and 6, split type inner rings 7 and 7 provided for each row of rollers, an integral outer ring 8 and a seal 9.
Is the roll 1 in the pressing device of FIG.

[0003]

In this pressing device, the strip W is pressed between the rolls 1 made up of the bearings shown in FIG. 6 and is fed, so that the outer diameter surface of the bearing outer ring 8 is worn. This wear limits the life of the bearing. Since the bearing outer ring 8 is made of bearing steel, it has some wear resistance, but further improvement in life is desired. Not only in the pressing device shown in FIG. 5, but also in the case of a bearing for a roll for which the bearing outer ring directly serves as the transport surface or the guide surface, a guide roller bearing, a cam follower bearing, etc. There's a problem.

The present invention solves the above problems, and an object of the present invention is to improve the wear resistance of the outer ring and the life of the bearing.

[0005]

The wear-resistant rolling bearing of the present invention is a rolling bearing having an outer ring and rolling elements, in which tool steel is used as the material of the portion forming the outer diameter surface of the outer ring. . The inner ring may be provided as an independent inner ring, or the shaft itself may be the inner ring. As tool steel material, alloy tool steel material,
Carbon tool steel, high speed tool steel, etc. can be used.

[0006]

[Function] Tool steel is superior in wear resistance to bearing steel, and the outer diameter surface of the outer ring is made of this wear-resistant tool steel. As described above, even when it is used for an application in which relative movement occurs with another object, abrasion is unlikely to occur and the life of the bearing becomes excellent. Excellent wear resistance can be obtained even in the case where the outer ring is in contact with a relative moving object under a heavy load, such as a pressing roll or a conveying roll of steel equipment.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. This embodiment is an example applied to a double row tapered roller bearing with a seal. In FIG. 1, parts corresponding to those in the example of FIG. 6 are given the same reference numerals. This rolling bearing comprises tapered rollers 6 and 6 which are double rows of rolling elements, two split type inner rings 7 and 7 provided for each roller row, and an integrated type having raceways of both roller rows. The outer ring 8 and the seals 9, 9 that seal the space between the inner and outer rings 7, 8. The rollers 6 and 6 of each row are held in the pockets of the cages 12 and 12, respectively. The inner ring 7 is of a type with both collars, a central inner ring spacer 10 is provided between the inner rings 7, 7, and a side inner ring spacer 11 is provided adjacent to the outside of the array of both inner rings 7, 7. ing. The seals 9 and 9 are made of an elastic material such as rubber having a mandrel, and are fixed to the seal mounting surfaces provided on both sides of the outer ring 8 in a press-fit state.
A double lip is provided on the inner diameter portion of each seal 9, and each lip portion slides on the outer surface of the collar portion of the inner ring 7 and the outer diameter surface of the inner ring spacer 11.

The outer ring 8 serves as a roll or a roller, and is formed to have a width that is extended to one end side from the total width of the inner rings 7, 7 and the inner ring spacers 10, 11. The outer ring 8 is dually configured with an outer ring body 8a and a sleeve 8b that constitutes an outer diameter surface, and the sleeve 8b is composed of the outer ring body 8a.
It is fixed by interference fit. The outer ring body 8a and the inner ring 7 are made of bearing steel or the like, and the sleeve 8b is made of tool steel.

As a tool steel material for the sleeve 8b,
Alloy tool steels (SKD, etc.) are preferable, and carbon tool steels (SK), high speed tool steels (SKH), etc. can be used in addition to these (the symbols in English letters are JIS standard symbols). Alloy tool steel Steel materials are SK materials such as W, Cr, Mo,
It is a tool steel steel material that has added wear resistance, impact resistance, non-deformability, heat resistance, etc. by adding special elements such as V, for cutting, impact resistance, cold forming, Divided into four types for hot forming. Of these, alloy tool steels for cold die steel materials (SKS3, 31, 93, SKD1,
11, 12) are preferred, and SKD11 is most preferred.
SKD1 and 11 are high C-high Cr among those for non-deformation resistance.
Since it is made of steel, it has particularly high wear resistance at room temperature and is suitable for dies, press dies, thread rolling rollers, and the like. In order to improve these hardnesses, heat treatment may be performed, and if induction heating is performed and rapid heating is performed for about 1 to 3 minutes, the heating work is quick and efficient. It is expected that induction hardening will result in a hardness that is about 5 in terms of H _R C hardness than that obtained by heating and hardening in a furnace. A soft nitriding method may be adopted as a surface treatment method having a relatively small internal strain. Examples of the soft nitriding treatment method include soft nitriding with gas or liquid, and the temperature may be raised or cooled under the temperature conditions as described above, and since it is performed at about 600 ° C. or less, internal strain is less likely to remain, Excellent dimensional accuracy. Depending on the material, specifications, conditions, etc., this may be soft nitriding treatment after carburizing and quenching, or induction hardening after soft nitriding treatment. It is also possible to adopt a method in which the hardness becomes harder. SKD1
A high surface hardness of 1 etc. can be obtained by nitriding treatment. SKD
When the component example of 11 is shown by percentage, C is 1.40 to
1.60, Si is 0.40 or less, Mn is 0.60 or less,
P is 0.030 or less, S is 0.030 or less, Cr is 1
1.00 to 13.00, Mo is 0.80 to 1.20, V
Is 0.20 to 0.50. Quenching and tempering hardness of SKD11 is more about H _R C58~65.

According to the rolling bearing of this construction, the outer diameter surface of the outer ring 8 is formed of the tool steel steel sleeve 8b and has high wear resistance, so that even if the outer diameter surface is used for rubbing against another object, Therefore, wear is less likely to occur, and the bearing life becomes excellent. For example, even when this rolling bearing is used for each of the upper and lower rolls 1 in the pressing device shown in FIG. 5, the outer peripheral surface of the outer ring of the bearing is less worn and the bearing has a long life. Further, the rolling bearing of this embodiment can be used as a roller in a roller conveyor for transportation of steel equipment, various guide rollers, cam followers, and the like, and in that case, a high effect of preventing wear of the outer diameter surface can be obtained. Further, according to the bearing having this configuration, since the bearing steel having a proven track record has been used as the material of the outer ring main body 8a forming the raceway surface of the outer ring 8, high reliability is maintained in various bearing characteristics. . Instead of forming the outer ring 8 double as described above, the outer ring 8 may be integrated and tool steel material may be used as the material thereof. You may select dull finish, bright finish, etc. as these surface finishes. The dull finish is a matte finish with a roll that has a mechanically or chemically roughened surface, and the bright finish is a smooth finish with a roll with a smooth surface. Surface 6b
When forming, the amount of shots is reduced in a surface treatment step such as shot blasting, or the surface treatment step may be omitted in some cases. When shot blasting is performed, fine recesses of about 0.3 mm to 0.4 mm or less can be formed on the surface, so a wedge effect can be expected and the adhesion with the housing 1 can be enhanced. Alternatively, the same effect can be expected by roughening the surface by chemical treatment. To prevent rust, these steel plates are plated with nickel such as Kanigen plating (registered trademark), chrome plating, hard chrome plating,
A surface protective layer may be formed by plating such as zinc plating and tin plating. Further, the surface may be further buffed. In addition, black dyeing or Parker Rising (registered trademark) may be applied. This surface treatment may be performed on both sides or one side of the steel sheet. Further, a protective layer may be provided only on the inner peripheral surface of the sleeve 9, the protective layer may be omitted on the surface of the outer peripheral surface due to the wedge effect, and after the protective layers are provided on both surfaces, the outer peripheral surface may be covered. You may perform the said surface treatment for roughening a surface.

In order to fix the outer diameter surface of the outer ring body 8a and the inner diameter surface of the sleeve 8b relatively strongly, at least
The outer diameter surface of the portion of the outer ring body 8a to which the sleeve 8b is attached,
Alternatively, the surface roughness of the inner diameter surface of the sleeve 8b is set to Rmax
, Ra, Rz, etc., may be about 3 to 8 μm or more, preferably about 8 to 25 μm or more, more preferably about 3 to 25 μm or more, and especially 25 μm or more. In particular, the outer ring main body 8a can reduce the amount of finishing processing in the processing process, improve the processing efficiency, and lead to overall cost reduction. Roll bearings for the edge / mirror plate pressing device, various transport rollers, Alternatively, it is considered to be effective for a bearing assembly mechanism in which a rolling bearing such as a guide roller and a sleeve are combined.

FIGS. 2A and 2B show other embodiments of the present invention. FIG. 2A is an example applied to a single-row cylindrical roller bearing, in which a cage 53 is provided between an inner ring 51 and an outer ring 52.
A roller 54, which is a rolling element held by, is interposed.
The outer ring 52 is an outer ring main body 52a and a sleeve 52b around the outer ring main body 52a.
And a tool steel material is used as the material of the sleeve 52a as in the above embodiment. Bearing steel or the like is used for the outer ring body 52a. FIG. 2B is an example applied to a single-row deep groove ball bearing, in which the cage 6 is provided between the inner ring 56 and the outer ring 62.
A ball 64, which is a rolling element held by No. 3, is interposed. The outer ring 62 is an outer ring body 62a and a sleeve 6 around the outer ring body 62a.
2b, and a tool steel material is used for the material of the sleeve 62a as in the above-mentioned embodiments. Bearing steel or the like is used for the outer ring body 62a. Also in these embodiments shown in FIGS. 2A and 2B, the outer rings 52 and 62 are used for carrying, holding,
Alternatively, abrasion of the outer diameter surface when used as a guide roller, a cam follower, or the like is prevented.

FIGS. 3A to 3C respectively show still another embodiment of the present invention. All of these examples are used for the backup rollers 23 and 24 which pressurize and support the upper and lower correction rollers 21 in the roller leveler 20 of FIG.

The bearing shown in FIG. 3A is constructed as a compound bearing in which a sleeve-shaped common outer ring 38b is provided on the outer periphery over two double-row tapered roller bearings 30, 30 arranged in parallel, and the common outer ring 38b. Becomes a roller. Each double-row tapered roller bearing 30 has double-row rollers 36, 36 interposed between an inner ring 37 and an individual outer ring 38a. The double-row tapered roller bearings 30, 30 have an individual outer ring 38a and a common outer ring. 38
b and the outer ring 38 of the composite bearing are formed. Bearing inner ring 3
7 may be provided separately for each row of rollers as in the example of FIG. The bearing inner ring 37 is fitted to the fixed shaft 35 of the bearing stand 33. Of the outer rings 38, the common outer ring 38
The tool steel material is used for the material of b like the above-mentioned embodiments, and the bearing steel is used for the individual outer ring 38a. FIG.
The bearing shown in FIG. 3B is the same as the bearing shown in FIG. 3A, except that a sleeve 38c is further provided on the outer periphery of the common outer ring 38b, and the individual outer ring 38a, the common outer ring 38b, and the sleeve 3 are provided.
The outer ring 38 of this composite bearing is constituted by 8c. However, in this embodiment, bearing steel and other metal materials are used for the common outer ring 38b, and the same tool steel and steel material as in each of the above embodiments is used for the material of the sleeve 38c. The bearing shown in FIG. 3C is configured as a compound bearing in which a sleeve-shaped common outer ring 48b is provided on the outer periphery over two double-row cylindrical roller bearings 40, 40 arranged in parallel, and the common outer ring 48b serves as a roller. Become. Each double-row cylindrical roller bearing 40 is an inner ring omitted type in which double-row rollers 36, 36 are directly brought into rolling contact with a fixed shaft 35, and the fixed shaft 35 serves as an inner ring. The individual outer ring 48a and the common outer ring 48b of both double-row cylindrical roller bearings 30 and 30,
The outer ring 48 of the composite bearing is constructed. Of the outer ring 48, the common outer ring 48b is made of a tool steel material as in the above-described embodiments, and the individual outer ring 48a is made of bearing steel. Also in the case of the embodiments of FIGS. 3A to 3C, since the outer diameter surfaces of the outer rings 38 and 48 are made of tool steel, the wear is prevented and the life is extended. In addition, these FIG.
(A) to (C) can be applied not only to the backup roller in the roller leveler 20 but also to a conveyance roller, a guide roller, and the like. Further, various rolling bearings such as ball bearings and roller bearings can be used in place of the individual bearings 30 and 40 in each embodiment of FIG. 3, and the common outer ring 38,
The number of individual bearings provided in 48 may be three or more.

[0015]

Since the wear-resistant rolling bearing of the present invention uses tool steel steel as the material of the portion forming the outer diameter surface of the outer ring, the outer ring directly contacts a moving object such as a pressing roll or a conveying roll. Even when used in applications such as rollers and guide rollers, the excellent wear resistance of the tool steel material reduces wear on the outer diameter surface of the outer ring and improves bearing life.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a wear resistant rolling bearing according to an embodiment of the present invention.

2A and 2B are partial cross-sectional views of a wear-resistant rolling bearing according to another embodiment of the present invention.

3 (A) to (C) are cross-sectional views each showing a state in which a wear-resistant rolling bearing according to still another embodiment of the present invention is installed on a shaft.

4 is a cutaway side view showing a conceptual configuration of a roller leveler using the bearing of FIG.

FIG. 5 is a side view showing a conceptual configuration of a conventional edge mirror plate pressing device.

FIG. 6 is a partial cross-sectional view of a conventional double row tapered roller bearing.

[Explanation of symbols]

6 ... Roller, 7 ... Inner ring, 8 ... Outer ring, 8a ... Outer ring body, 8b
... Sleeve, 9 ... Seal, 30 ... Double row tapered roller bearing,
38 ... Outer ring, 38a ... Individual outer ring, 38b ... Common outer ring, 4
8 ... Outer ring, 48a ... Individual outer ring, 48b ... Common outer ring, 52
Outer ring, 52a ... Outer ring body, 52b ... Sleeve, 62 ...
Outer ring, 62a ... Outer ring body, 62b ... Sleeve

Claims (1)

[Claims] 1. A rolling bearing having an outer ring and rolling elements, wherein a wear resistant rolling bearing uses tool steel material as a material of a portion forming an outer diameter surface of the outer ring.