Device and method for producing a curved lateral surface on a rolling element

Abstract

A device for producing a curved lateral surface on a rolling element for a rolling bearing includes a grinding apparatus for grinding the curved lateral surface and a retaining apparatus having a control wheel with a convexly profiled peripheral feeding surface for retaining the rolling element during the grinding. The retaining apparatus may include a plurality of control wheels. The control wheel or the convexly profiled peripheral feeding surface may be formed from a ceramic, a resin-bonded synthetic, or a metallic material. The device may include a dressing apparatus for profiling the convexly profiled peripheral feeding surface of the control wheel.

Claims

1. A device for producing a curved lateral surface on a rolling element for a rolling bearing, comprising: a grinding apparatus for grinding the curved lateral surface; a retaining apparatus comprising a control wheel with a convexly profiled peripheral feeding surface for retaining the rolling element during the grinding; and a dressing apparatus for profiling the convexly profiled peripheral feeding surface of the control wheel.

2. The device of claim 1 wherein the retaining apparatus comprises a plurality of control wheels.

3. The device of claim 1, wherein the control wheel or the convexly profiled peripheral feeding surface is formed from a ceramic, a resin-bonded synthetic, or a metallic material.

4. The device of claim 1, wherein the dressing apparatus is arranged to convexly profile the convexly profiled peripheral feeding surface.

5. The device of claim 1 further comprising a control apparatus for controlling the dressing apparatus.

6. The device of claim 1, wherein the grinding apparatus is a grinding wheel with a concavely profiled peripheral grinding surface.

7. A device for producing a curved lateral surface on a rolling element for a rolling bearing, comprising: a grinding wheel with a concavely profiled peripheral grinding surface for grinding the curved lateral surface; a retaining apparatus comprising a control wheel with a convexly profiled peripheral feeding surface for retaining the rolling element during the grinding; and a dressing apparatus for: sharpening or calibrating the concavely profiled peripheral grinding surface; profiling the concavely profiled peripheral grinding surface; or profiling the convexly profiled peripheral feeding surface.

8. The device of claim 7, wherein the dressing apparatus is arranged to: concavely profile the concavely profiled peripheral grinding surface; or convexly profile the convexly profiled peripheral feeding surface.

9. The device of claim 7 further comprising a control apparatus for controlling the dressing apparatus.

10. A method for producing a curved lateral surface on a rolling element for a rolling bearing comprising: providing the device of claim 1; arranging the rolling element on the convexly profiled peripheral feeding surface; grinding the curved lateral surface; and processing or convexly profiling the convexly profiled peripheral feeding surface with the dressing apparatus.

11. The method of claim 10, further comprising: providing a control apparatus; and controlling the dressing apparatus with the control apparatus to convexly profile the convexly profiled peripheral feeding surface.

12. The method of claim 10, wherein the processing or convexly profiling the convexly profiled peripheral feeding surface with the dressing apparatus comprises wire electrical discharge machining.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further features, advantages and effects of the disclosure are set out in the following description of example embodiments of the disclosure. Therein:

(2) FIG. 1 shows a device from the prior art with a hump roller as a feeding and retaining device and a grinding apparatus for producing a tapered roller with a curved lateral surface; and

(3) FIG. 2 shows a device with a control wheel as a feeding and retaining device and with a grinding apparatus for producing a rolling element with a curved lateral surface.

(4) FIG. 3 shows a device includes a dressing apparatus for dressing a grinding apparatus and a retaining apparatus.

DETAILED DESCRIPTION

(5) FIG. 1 shows a device 50 from the prior art, which is designed to produce a curved, e.g., crowned, lateral surface 52 on a tapered roller 51. The device 50 includes a grinding apparatus 53 and a plurality of rotatable hump rollers 55, which are arranged to be adjacent to one another in a row and rotate together. Each hump roller 55 has in a longitudinal section two humps 56 on which the tapered roller 51 rests. The grinding apparatus 53 is designed as a rotatable grinding wheel having a grinding surface 54. The grinding wheel and the hump rollers 55 rotate in opposite directions.

(6) Each hump roller 55 forms a retaining apparatus for exactly one tapered roller 51, which is arranged on the hump roller 55 and is thereby brought into contact with the grinding surface 54. The tapered roller 51 rotates with the hump roller 55 and is ground by the grinding surface 54 of the grinding wheel so that the curved lateral surface 52 is produced.

(7) A producible curvature or crowning of the lateral surface 52 on the tapered roller 51 is limited in terms of production technology with the device 50 from the prior art, e.g., due to the arrangement on the hump roller 55 and due to a dead weight of the tapered roller. Therefore, geometric restrictions in the curvature or crowning of the lateral surface must be accepted.

(8) In FIG. 2, a device 1 is shown which is designed to produce a curved, e.g., crowned, lateral surface 3 on a rolling element 2 for a rolling element bearing. The rolling element is designed as a tapered roller 2. With the device 1, the production technology limitations of the device 50 from FIG. 1 can be reduced or even overcome.

(9) The device 1 includes a grinding apparatus 4, which is designed as a grinding wheel 7 rotatable in a first direction of rotation R1. The grinding apparatus 4 has a concavely profiled peripheral grinding surface 5, with which the curved lateral surface 3 on the tapered roller 2 can be ground.

(10) The device 1 includes a retaining apparatus 6 for retaining the tapered roller 2 during the grinding of the curved lateral surface 4.

(11) The retaining apparatus 6 is designed as a plurality of rotatable control wheels 8 which are arranged to be adjacent to one another in a row. The control wheels are rotatably mounted and rotate together in a second direction of rotation R2, which is directed opposite to the first direction of rotation R1. Each control wheel 8 has a convexly profiled peripheral feeding surface 9 on which the tapered roller 2 can be arranged and mounted. Each control wheel 8 and/or each peripheral feeding surface 9 is formed from a ceramic, synthetic resin-bonded, or metallic material.

(12) Due to the mounting on the convexly profiled peripheral feeding surface 9, the curved, e.g., crowned, lateral surface 3 on the tapered roller 2 can be produced with fewer geometric restrictions.

(13) As shown in FIG. 3, the device 1 includes a dressing apparatus 10 for dressing the grinding apparatus 4 and the retaining apparatus 6. The dressing apparatus 10 is designed as a stationary dressing apparatus. Alternatively, it can be designed as a rotating dressing apparatus. The device 1 also includes a control apparatus 11 for controlling the dressing apparatus 10. The control apparatus 11 can be designed, for example, as an NC control.

(14) The dressing apparatus 10 is provided to profile, sharpen, and/or calibrate the peripheral grinding surface 5 of the grinding wheel 7. To avoid dulling, this can also take place during the grinding of the lateral surface 3 of the tapered roller 2.

(15) In addition, the dressing apparatus 10 is provided to convexly profile the peripheral feeding surface 9 of the control wheel 8, e.g., if the control wheel 8 and/or the peripheral feeding surface 9 is/are formed from the ceramic or synthetic resin-bonded material. The convex profiling of the peripheral feeding surface 9 by the dressing apparatus 10 takes place before the control wheel 8 is used in the device 1 as the retaining apparatus 6.

(16) In the example embodiment shown, no additional processing machine, for example a grinding or hard lathe machine, is required for profiling the peripheral feeding surface 9, but the already existing dressing apparatus 10 can be used. This saves costs for the acquisition of the additional processing machine and reduces the handling and administrative expenditure for the profiling of the peripheral feeding surface 9 of the control wheel 8, and for the transport of the retaining apparatus 6 to the device 1.

(17) The use of ceramic or synthetic resin-bonded control wheels eliminates externally excited vibrations, which are caused by the process in the force triangle between the grinding wheel, control wheel and support rail. Here the control wheel acts as a damping element, which enables the use of ceramic bonded grinding wheels.

(18) In the event that the control wheel 8 and/or the peripheral feeding surface 9 is/are formed from the metal-bonded material, the concave profile can be introduced into the peripheral feeding surface 9 of the control wheel 8 by wire electrical discharge machining.

REFERENCE NUMERALS

(19) 1 Device 2 Tapered roller, rolling element 3 Lateral surface 4 Grinding apparatus 5 Concavely profiled peripheral grinding surface 6 Retaining apparatus 7 Grinding wheel 8 Control wheel 9 Convexly profiled peripheral feeding surface 10 Dressing apparatus 11 Control apparatus 50 Device from the prior art 51 Tapered roller 52 Lateral surface 53 Grinding device 54 Grinding surface 55 Hump roller 56 Hump R1 First direction of rotation R2 Second direction of rotation