DE102006041584A1 - Roller bearing component e.g. inner ring, for motor vehicle, has carrier forming core and provided with vibration reducing characteristics, and edge layer with roll-fixed surface provided on carrier in metal spray compacting method at side - Google Patents

Abstract

The component has a metallic carrier (9) e.g. sinter body or a grey cast body, forming a core (10) and provided with vibration reducing characteristics. An edge layer (11) with a roll-fixed surface (12) is provided on the metallic carrier in a metal spray compacting method at a side. The edge layer for compression is mechanically reprocessed. A cylindrical rod or a cylindrical pipe is used as the carrier. An independent claim is also included for a method for manufacturing a roller bearing component.

Description

Field of the invention

The The invention relates to a rolling bearing component with anti-rolling surface and vibration damping Core.

Background of the invention

roller bearing made of hardened or case hardened toughen have only a low sound or vibration damping. The in operation of the roller bearing Component generated vibrations to which the component is exposed, be through the rolling bearing passed on and lead unhindered to a reduction in the function of quiet running and operating noise. Such Problems arise for example when using such bearings in vibration-sensitive components such as e.g. machine tools or engine elements of motor vehicles, where the structure-borne noise restricts the comfort of the vehicle. To a sound or vibration damping too achieve, are usually Auxiliary elements used, for example in the form of active damping via balance shafts, Piezo elements or dampers made of elastomers or cast iron moldings. This leads to elaborate constructions, it will be additional Parts with additional Include expenses and corresponding weight penalties needed.

Summary of the invention

Of the The invention is thus based on the problem of a rolling bearing component specify that, while maintaining the required rolling properties, a certain vibration damping allows.

to solution the problem is a rolling bearing component with anti-rolling surface and vibration damping Kern provided, consisting of a core forming metallic carrier with vibration damping Property, on which in a metal spray compaction process at least one side of a rolling resistant surface having Surface layer sprayed on is.

The Rolling bearing component according to the invention is made in a kind of sandwich construction. Is the starting part a metallic carrier, in its basic form, at least approximately the shape of the produced rolling bearing component equivalent. This metallic carrier has a vibration damping Property, so is able to built-in rolling bearing component (usually as part of a rolling bearing) dampen registered vibrations, so this over such a rolling bearing only muted be passed on. Such a support may according to the invention be a sintered body, So a powder metallurgically produced, open-pore body whose Pore volume and pore shape by the sintering conditions and the Choice of the sintering material used, in this case a fine-grained stainless steel powder, can be adjusted. Alternatively to the use of a sintered body can the carrier also a cast iron body be. A gray cast iron body has graphite fins, which serve as scattering centers and thus also sound or vibration damping effect.

On this the vibration-damping core forming carrier is now according to the invention at least one side in a metal spray compaction process an edge layer in the desired thickness sprayed, wherein the edge layer is the rolling resistant surface having. The spraying conditions will be adjusted so optimally that the surface temperature at the carrier or the already applied coating is optimal and close to the solidus temperature of the sprayed liquid metal lies. With such optimal spraying conditions may be an edge layer with a minimum residual porosity, for example at a sprayed Steel 100Cr6 is well below 1 vol.% To be achieved. therefore a density of even more than 99.9% is achievable. This high density, sprayed Outer layer meets the mechanical requirements of this Layer or the surface of the layer on which a other rolling bearing component rolls off, be put. The metal spray process leaves without another cohesive Connection between the boundary layer, for example, in a Thickness of about 1-2 mm, and the core carrier too.

at the rolling bearing component It may, depending on the carrier form and coating used, for example around rolling elements in Act of roles. The carrier is then a rod, in the spray cone rotates and on which the surface layer is deposited. Of this long rod then the individual rolling bearing components are cut to length. To the Working out of the rolling resistant surface is then usually only a thin one Remove boundary layer (preferably before cutting the individual parts to length), superficially around the surface layer flatten.

When Rolling components can but also rolling bearing rings be made in the form of axial, inner or outer rings. In this case, as a carrier preferably a tube used, so a sintered tube or a gray cast iron tube, which is only coated on the side on which a rolling resistant Surface is needed in an inner ring to be produced, ie on the inner side of the pipe, in an outer ring to be produced on the outside of the pipe. Again, in a post-processing only a thin edge zone to work out the rolling resistant surface ablate.

The Sandwich construction according to the invention makes it possible a carrier with optimized vibration damping Properties with a rolling resistant Outer layer that meets all the mechanical requirements imposed on the rolling bearing component be put to combine. Such a rolling bearing component is thus in Stand, on the one hand, the required rolling properties easily to disposal on the other hand also to sound or vibration damping Act.

Although as stated it by optimal spray parameters possible is to make the compacted surface layer high density and a Density of more than 99.9%, it is sometimes still appropriate, the Rework the outer layer mechanically for compaction. That is, the rolling bearing component itself has a mechanically recompacted edge layer. This can by rolling, pressing or cold rolling, etc., wherein, depending on whether the rolling bearing component is produced as a single component, or whether a long component, from which the individual rolling bearing components cut be, this mechanical post-processing either on the individual component or on the long component can be made.

Next the rolling bearing component itself, the invention further relates to a process for the preparation a rolling bearing component with anti-rolling surface and vibration damping Kern, in which a prefabricated carrier with vibration-damping Property on at least one side in a metal spray compaction process with a rolling resistant surface forming Surface layer is coated. As described, the carrier may be substantially in its form already correspond to the individual component to be produced, However, it can also be a long carrier in the form of a rod or act of a tube from which then the individual rolling bearing components suspended accordingly become. The rolling ones surface forming edge layer must as described only in the area of a thin Edge zone are machined to work out the rolling resistant surface. For further compression and thus reduction of the already low Pore volume of the surface layer may be the rolling bearing component or the carrier, be it is a rod or pipe, mechanically reworked, for example by rolling or cold rolling.

When carrier As described, either a cylindrical rod or a cylindrical one Tube can be used, with the tube on the outside of the tube or the inside of the pipe is coated, while the rod inevitably only at the bar outside can be coated, from which rod or pipe the individual rolling bearing component cut will, then as described either only to remove the thin edge zone and working out the anti-rolling surface or in addition is post-processed to recompact the surface layer.

Brief description of the drawings

Further Advantages, features and details of the invention will become apparent the embodiments described below and with reference to the Drawings. Showing:

1 a schematic diagram of a device for metal spray compacting,

2 a diagram illustrating the production route for rolling elements, and

3 a diagram illustrating the production route for radial bearing rings.

Detailed description the drawings

1 shows a schematic diagram of a device 1 for metal spraying. This includes in an upper housing 2 purged with argon, a crucible 3 in which the bearing steel to be sprayed, for example 100Cr6, is melted and overheated to a final temperature of 1600 ° C. The melt is then in a manifold 4 to an outlet nozzle 5 led, where she exits and then on a Freifallzerstäuber 6 comprising a plurality of atomizer nozzles 7 , from which, for example, nitrogen is sputtered for atomizing, is atomized. The atomization leads to the formation of a spray cone 8th , consisting of fine metal droplets that still have a doughy consistency. The spray cone 8th is on a carrier 9 directed, here a rod or a tube, which, as shown by the two arrows, on the one hand axially displaced, on the other hand, rotates, so that circumferentially an outer edge layer on the support 9 is sprayed on. At optimum surface temperature near the solidus temperature at the surface of the support 9 or the already deposited metal layer is a minimum residual porosity of well below 1 vol.% achievable. By mechanical post-processing even a complete tightness of the edge layer or the edge zone, in which the rolling resistant surface is to be formed as will be described below, can be achieved. In contrast, the carrier used 9 a high porosity. It may, for example, be a sintered body or a cast iron body.

2 shows a schematic diagram for the production of individual rolling bearing components in the form of cylindrical rollers. Shown is first the carrier 9 , here a rod, for example a sintered rod, which, like through the indicated spray cone 8th is shown, first in the device 1 is sprayed with the surface layer. As shown in the partial cross-sectional view shown below, the finished sprayed bar is a core 10 formed by the bar carrier 9 on which the edge layer 11 is sprayed on. The core points clearly 10 As shown by the puncture, an open-pore structure, the pore volume should preferably be more than 10%, and the density less than 90%. In contrast, the edge layer, as shown by the puncture, almost completely dense, so there is a density or porosity gradient of the edge layer 11 to the core 10 , The core 10 is due to its residual porosity vibration damping. Instead of using a sintered body, a gray cast iron body would also be equally usable; this also exhibits vibration-damping properties via the graphite lamellae formed or enclosed therein.

In the next step, the sprayed bar, after possibly a thin edge zone has been removed, mechanically reworked, either by rolling or, for example, cold rolling. This results in a complete compaction in the region of the surface layer 11 that the rolling resistant surface 12 has or forms. Then, from the long rod, the individual rolling elements 13 , here cylindrical rollers, cut to length.

3 shows the production route for a radial bearing inner ring. Shown here is a tube that, as by the spray cone 8th is shown, is sprayed on its outside with the edge layer. Subsequently, the tube is rolled or cold rolled or otherwise as on its outer surface for mechanical compaction of the surface layer 11 reworked. In the section shown through the coated tube can be seen again the core 10 , formed by the vehicle 9 , as well as the trained edge layer 11 that too, compared to the core here 10 , is high density, while the core 10 has a sufficiently large pore volume, that is vibration damping.

From the coated tube are now as shown in the next step, the individual rolling bearing components 13 , which on its outside the rolling resistant surface 12 have, cut to length. The core is therefore also porous here, so has a density <90%, or has corresponding graphite lamellae as inclusions, so that it has a vibration-damping effect, the edge layer, however, is highly dense and resistant to rolling.

Instead of a radial bearing inner ring, it is also conceivable in principle to produce an outer ring for such a radial bearing. In this case, not the outside, but the inside of the pipe support 9 be coated. This can be done using a pipe when using the metal sprayer 1 is possible, at a sufficient angle into the tube interior with the spray cone 8th to radiate. The larger the diameter of the Trä gers, the easier it is. Otherwise, of course, there is the possibility as a carrier 9 already to use individual rings, so that correspond in shape approximately to that of the finished rolling bearing component. The axial length is naturally relatively low, so that can be easily radiated and coated at an angle.

Instead of The radial coating is also an axial on individual rings Coating conceivable, whereby thrust bearing rings can be produced.

1

Facility

2

casing

3

melting pot

4

distributor

5

exhaust nozzle

6

Freifallzerstäuber

7

atomizer

8th

spray cones

9

carrier

10

core

11

boundary layer

12

surface

13

Rolling components

Claims (7)

Rolling bearing component with a rolling-resistant surface and a vibration-damping core, consisting of a core ( 10 ) forming metallic carrier ( 9 ) having a vibration-damping property, on which, in a metal spray-compaction process, on at least one side, a rolling-resistant surface ( 12 ) having boundary layer ( 11 ) is sprayed on. Rolling bearing component according to claim 1, characterized in that the carrier ( 9 ) is a sintered body or a cast iron body. Rolling bearing component according to claim 1 or 2, characterized in that the surface layer ( 11 ) is mechanically reworked for densification. rolling bearing component according to one of the preceding claims, characterized that it is an axial, external or inner ring or a cylindrical rolling element. Method for producing a roller bearing Components with rolling-resistant surface and vibration-damping core, in which a prefabricated carrier with vibration-damping property is coated on at least one side in a Metallsprühkompaktierungsverfahren with an anti-rolling surface forming surface layer. Method according to claim 5, characterized in that that as a carrier a cylindrical rod or a cylindrical tube is used, the pipe being on the pipe outside and / or the pipe inside coated with a metal layer is cut, from which rod or tube the individual rolling bearing component is cut. Method according to claim 5 or 6, characterized that the boundary layer of the rolling bearing component or the rod or tube mechanically reworked for compression becomes.