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Method for producing a rolling bearing component and rolling bearing component

The carbon content of the metal to be sprayed is changed through the spraying method to form a carbon gradient surface layer of the rolling bearing, which solves the problem of long carburizing treatment in the existing technology, realizes efficient and low-cost rolling bearing manufacturing, and eliminates the heat treatment step, improving improve production efficiency.

Inactive Publication Date: 2009-06-03
SCHAEFFLER TECHNOLOGIES AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This processing step is thus associated with considerable time-consuming, which also has an adverse effect on production costs

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0024] figure 1 A spraying device 1 is shown in schematic form, by means of which the method according to the invention can be carried out. The injection device 1 has an injection unit 2 on the one hand and a melt storage container 3 in which the molten metal S is contained. In addition, a carrier gas source 4 is provided, here a nitrogen supply. The molten metal to be sprayed is continuously withdrawn from the melt storage vessel 3 and is sprayed in the form of very small metal droplets 5 via a carrier gas with a spray cone 6 onto a carrier 7, in the example shown due to quenchable Tubes of hard metal. The carrier 7 rotates and is axially movable. As the rotation increases and the spraying continues, a thicker and thicker spray compaction layer is formed on the carrier 7 . In order to be able to vary the carbon content in the sprayed-on layer 8, carbon C is added to the melt S at the appropriate time in the example shown. This can be achieved by adding carbon filaments o...

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PUM

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Abstract

The present invention relates to a method for producing a rolling bearing component with a carbon gradient, at least in the region of its outer layer, wherein molten metal is sprayed onto a carrier in a spraying process, the carbon content of the metal to be sprayed on being varied during the spraying operation.

Description

technical field [0001] The invention relates to a method for producing a rolling bearing component having a carbon gradient at least in its surface region. Background technique [0002] Known rolling bearings consist of at least two components, ie one or more rings, in which rolling bodies, such as rollers, run. Typically such rotationally symmetrical rolling bearing components are machined, for example, from carburized steel, wherein the rings or rollers are turned from bar stock or forged from cylindrical stock. In order to form a given hardness in the surface area, the gradient structure is adjusted by carburizing, and carbon is enriched inside the surface gradient structure by heat treatment. Carbonitriding can also be used if necessary, ie nitrogen enrichment is also carried out in the surface area. After carburizing, this surface layer hardens due to the enrichment of at least 0.6% carbon and optionally also nitrogen. The rolling bearing ring hardness is usually 58 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/12F16C33/30
CPCF16C33/64C23C4/121F16C33/34F16C33/62C23C4/065C23C4/067C23C4/123Y10T29/49707Y10T29/49709Y10T29/49705F16C33/30F16C33/58
Owner SCHAEFFLER TECHNOLOGIES AG & CO KG