JP2015004410A - Method of manufacturing self-aligning roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a self-aligning roller bearing, for allowing the formation of dimples (depressions) whose shapes, sizes and depths are controlled, in the side faces of a guide ring, while actualizing a big share of recessed portions without producing protruded portions with the formation of the dimples.SOLUTION: In the method of manufacturing the self-aligning roller bearing which includes an inner ring 1 having an inner ring raceway surface 1a on the outer peripheral face, an outer ring 2 having an outer ring raceway surface 2a on the inner peripheral face, a plurality of rollers 3 rollably arranged between the inner ring raceway surface 1a and the outer ring raceway surface 2a in a bilaterally symmetrical manner and having rolling surfaces relative to the inner ring raceway surface 1a and the outer ring raceway surface 2a, a cage 4 rollably holding the rollers 3, and a guide ring 5, metallic particles or non-metallic particles such as SiC are shot to side faces 5c of the guide ring 5 and then elastic materials are shot thereto.

Description

  The present invention relates to a method of manufacturing a self-aligning roller bearing, and relates to a method of manufacturing a self-aligning roller shaft used in various machines, for example, industrial machines such as steel and paper.

  Spherical roller bearings include an inner ring having a double-row raceway surface on the outer circumferential surface, an outer ring having a spherical raceway surface facing the raceway surface of the inner ring on the inner circumferential surface, and a double-row raceway surface of the outer ring and the inner ring. And a plurality of rollers disposed so as to be freely rollable therebetween. In such a self-aligning roller bearing, in many cases, guide wheels for guiding the axial end surfaces of the rollers are arranged between the roller rows so that the double row rollers can roll without skew. It has been broken.

  However, when a self-aligning roller bearing is used under high speed rotation or high load, sliding friction increases on the sliding contact surface between the guide wheel and other rolling parts (inner ring, outer ring, roller, cage, etc.). Heat generation, wear, and abnormal noise may occur, and wear powder may reduce the grease life. That is, in order to extend the life of the self-aligning roller bearing under high speed rotation or high load, it is necessary to reduce the sliding friction associated with the installation of the guide wheels.

  Thus, as a technique for reducing sliding friction associated with the installation of the guide wheel, Patent Document 1 is characterized in that a hardened surface layer made of a ceramic layer, a DLC layer, a shot peening layer, or the like is formed on the guide wheel. Among them, the shot peening layer has a thickness of 3 μm and a maximum roughness of 2.5 μm or less, and the surface has a surface structure in which minute irregularities are uniformly distributed, and the lubricating oil is held in the irregularities. A technique has been proposed in which a fluid film is formed and there is an action of eliminating oil film breakage at the contact surface of the guide ring, the inner ring, and the cage.

JP 2007-278494 A

However, the above technique cannot control the shape, size, depth, and the like of the dimples, and there is a problem in that it has an adverse effect on the bearing life because convex portions exist.
Therefore, the present invention has been made paying attention to the above problems, and its purpose is to shot metal particles or non-metal particles such as SiC on the side surface of the guide wheel, and then perform a specular shot by an elastic shot. By applying this, it is possible to form dimples (recesses) with a controlled shape, size, and depth on the surface, and there is no convexity caused by dimple formation, and self-alignment where the concave part can occupy a large proportion It is providing the manufacturing method of a roller bearing.

  In order to solve the above problems, a method of manufacturing a self-aligning roller bearing according to claim 1 of the present invention includes an inner ring having an inner ring raceway surface on an outer peripheral surface, an outer ring having an outer ring raceway surface on an inner peripheral surface, and the inner ring. A plurality of rollers that are freely rollable and symmetrically arranged between the raceway surface and the outer ring raceway surface, and that have rolling surfaces with respect to the inner ring raceway surface and the outer ring raceway surface, and a cage that holds the rollers in a freely rollable manner. And a method of manufacturing a self-aligning roller bearing including a guide wheel, wherein metal particles or non-metal particles such as SiC are shot on the side surface of the guide wheel, and then an elastic body is shot.

  As described above, according to the manufacturing method of the self-aligning roller bearing according to the present invention, the metal wheels or non-metal particles such as SiC are shot on the side surface of the guide wheel, and then the mirror shot is performed by the shot of the elastic body. Spherical roller bearings that can form dimples (indentations) with a controlled shape, size, and depth on the surface, and that do not have any protrusions caused by dimple formation, and that the recesses can occupy a large proportion The manufacturing method of can be provided.

It is sectional drawing which shows the structure of the self-aligning roller bearing which concerns on this invention.

  Hereinafter, an embodiment of a method for manufacturing a self-aligning roller bearing according to the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view showing a configuration of a self-aligning roller bearing according to the present invention.

This self-aligning roller bearing rolls between an inner ring 1 having an inner ring raceway surface 1a on an outer peripheral surface, an outer ring 2 having an outer ring raceway surface 2a on an inner peripheral surface, and the inner ring raceway surface 1a and the outer ring raceway surface 2a. A plurality of rollers 3 that are freely and symmetrically arranged and have rolling surfaces with respect to the inner ring raceway surface 1a and the outer ring raceway surface 2a, and a cross-sectional view that holds the rollers 3 in a rollable manner for each roller row are substantially L. And a ring-shaped guide ring 5 disposed between the axially central portion 1b of the outer peripheral surface of the inner ring 1 and the inner peripheral surface of the retainer 4. Guide wheel 5
The inner peripheral surface (sliding contact surface) 5 a is in sliding contact with the axial central portion 1 b on the outer peripheral surface of the inner ring 1, and the outer peripheral surface (sliding contact surface) 5 b is on each inner peripheral surface of the two cages 4. Further, both axial side surfaces (sliding contact surfaces) 5 c are in sliding contact with the axial end surface of the roller 3. A lubricant 6 is disposed in a gap formed between the inner ring 1 and the outer ring 2 and in which the rollers 3 and the guide wheels 5 are provided. The lubricant 6 may be a grease composition containing a base oil and a thickener, or may be a lubricant.

  Dimples (recesses) are formed in advance on both side surfaces 5c of the guide wheel 5 by shot machining. For example, by using metal particles or non-metal particles such as SiC as injection particles, and injecting them onto the surface of the guide wheel 5 at an injection speed of 30 m / sec or more for about several seconds to several tens of seconds, And the internal residual compressive stress on the surface can be increased. Depending on the injection speed, the side surface 5c of the guide wheel 5 is repeatedly subjected to rapid heating / cooling in a temperature range equal to or higher than the A3 transformation point by shot processing, and processing having a heat treatment effect and a forging effect is performed. It will be. As a result, martensite, recrystallization, and refinement of the retained austenite in the metal surface layer are performed, and a dense, high hardness and tough structure can be obtained.

  After the shot processing, the particles having diamond particles fixed on the rubber elastic body are shot. As a result, a concave portion that holds oil is formed, and the convex portion is shaved, so that the side of the guide wheel is subjected only to shot peening or the like, or a self-aligning roller that is not subjected to any surface treatment on the side of the guide wheel. Compared to a bearing, the attacking property against the contact partner (roller) is also reduced, and the promotion of heat generation and wear can be suppressed. In addition, dimples (indentations) with a controlled shape, size, and depth can be formed on the surface, and there are no protrusions caused by dimple formation, and the recesses can occupy a large proportion. In this case, the oil reservoir effect is increased and the oil film forming ability is increased.

DESCRIPTION OF SYMBOLS 1 Inner ring 1a Inner ring raceway surface 1b Axial center part 2a in outer ring outer peripheral surface 3 Outer ring raceway surface 3 Roller 4 Cage 5 Guide wheel 5a Guide wheel inner peripheral surface 5b Guide wheel outer peripheral surface 5c Guide wheel side surface 6 Lubricant

Claims (1)

  An inner ring having an inner ring raceway surface on an outer peripheral surface, an outer ring having an outer ring raceway surface on an inner peripheral surface, and freely rollable and symmetrically disposed between the inner ring raceway surface and the outer ring raceway surface; In a method for manufacturing a self-aligning roller bearing including a plurality of rollers having a rolling surface with respect to the outer ring raceway surface, a roller that holds the rollers in a freely rolling manner, and guide wheels, metal particles or SiC or the like is provided on the side surfaces of the guide wheels. A method of manufacturing a self-aligning roller bearing, characterized in that the non-metallic particles are shot and then the elastic body is shot.

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