Honing tool and method for machining a bearing part

Abstract

The invention relates to a honing tool (3), in particular for machining a bearing part, comprising a honing stone holder (7), in which a branching lubricant duct (16) is situated, which has a first, straight section (17), two sections (23, 24) which are connected to and positioned diagonally to the first section, and two transition sections (27, 28) which adjoin these sections (23, 24) and are arranged in a plane parallel to and spaced from the first section (17), wherein open end sections (31, 32) continue from the transition sections (27, 28), said end sections being directed towards a plane which is parallel to the aforementioned plane and in which the first section (17) of the lubricant duct (16) is situated.

Description

[0001] The invention relates to a honing tool that enables the supply of coolant to a workpiece. Furthermore, the invention relates to a method for honing a bearing component, in particular a wheel bearing.

[0002] A honing tool is known, for example, from DE 33 36 626 A1. This known honing tool is designed for connection to a pressurized honing oil supply. The honing oil is intended to flush away abrasion from the working surface of a honing stone.

[0003] Another honing device, which includes a supply channel for a cutting fluid, is disclosed in CN 202399128 U. The supply channel for cutting fluid has an inlet and a double outlet.

[0004] A device known from DE 10 2009 040 062 A1 for the finishing of ring-shaped workpieces, in particular bearing rings, comprises a device for short-stroke honing, which has an oscillation drive for generating oscillating movements of a honing stone holder. Furthermore, a tool holder is provided, which is configured to receive a hard turning tool.

[0005] Another device for the mechanical finishing of surfaces on rotationally symmetrical workpieces is described in DE 10 2007 054 897 B4. The workpiece to be machined can be a bearing ring for a double-row spherical roller bearing. A tool carrier of the known machining device can perform both short-stroke and long-stroke oscillating movements using various drives.

[0006] DE 37 19 796 A1, which forms the basis for the preamble of claim 1, describes a method and a tool for surface treatment. In addition to honing and high-pressure blasting, the surface is treated by brushing. The tool has a blasting unit with outlets connected via a distribution system to a high-pressure source, which is fed from a high-pressure reservoir containing liquid, in particular honing oil. The tool also includes brush bars and honing bars.

[0007] DE 15 65 709 A1 discloses a mechanical-galvanic honing machine for honing a workpiece surface using a mechanical honing process and electrochemical material removal.

[0008] DE 10 2012 20 766 A1 describes a honing device with a rotary tool and honing stones for grinding a cylinder bore.

[0009] The invention is based on the objective of achieving progress, particularly in the honing of bearing components such as wheel bearing components, compared to the aforementioned prior art with regard to efficient, process-reliable manufacturing.

[0010] This problem is solved according to the invention by a honing tool having the features of claim 1. Likewise, the problem is solved by a method for machining, namely honing, a bearing component, in particular a wheel bearing, according to claim 7. The embodiments and advantages of the invention explained below in connection with the machining method also apply mutatis mutandis to the honing tool and vice versa.

[0011] The honing tool comprises a honing stone holder in which a branching lubricant channel is arranged. This channel has a first, straight section, two sections connected to it at an angle relative to it, and two transition sections adjoining these angled sections. These transition sections are arranged in a plane spaced parallel to and spaced apart from the first section. Open end sections extend from the transition sections and are directed, as plane normals, onto a plane parallel to the aforementioned plane defined by the position of the transition sections, and in which the first section of the lubricant channel lies. The term "transition sections" was chosen for linguistic distinction from the other sections of the lubricant channel and does not imply any differing geometric design of the transition sections.

[0012] With this design of the forked lubricant channel in the honing stone holder, it is possible to use one and the same honing tool, particularly with the honing stone retained in the holder, for honing both rolling bearing raceways of an outer ring of a wheel bearing for a motor vehicle. Regarding the movements of the honing tool and the workpiece or bearing component, especially the outer wheel bearing ring, during the machining process, standard procedures can generally be implemented.

[0013] In general, the honing process comprises the following steps: Provision of a bearing component, in particular a wheel bearing, namely a one-piece outer ring, through which two raceways for rolling elements are formed; provision of a honing tool, which is formed from a cranked holder and a honing stone fixed therein, wherein the longitudinal direction of the holder is determined by a shank of the holder and the honing stone is designed as an elongated cuboid which forms a right angle with the longitudinal direction of the holder, and wherein the holder is traversed by a lubricant channel branching within the holder, the outlet openings of which are arranged next to the honing stone; machining of the first raceway of the outer ring with the honing tool, wherein coolant is guided through the lubricant channel and directed in the longitudinal direction of the honing stone onto the surface being machined; machining of the second raceway of the outer ring with the honing tool.Cooling lubricant is then guided through the lubricant channel and directed longitudinally along the honing stone onto the surface being machined.

[0014] The description of elongated cuboids in connection with the honing stone refers to its basic shape. Particularly in the machining area, the shape of the honing stone may deviate from a cuboid.

[0015] Regarding the design of an outer ring of a wheel bearing, reference is made to DE 10 2009 051 930 A1 as an example. Wheel bearings with more than two rows of rolling elements, as disclosed for example in DE 10 2010 055 405 A1, can also be machined with the honing tool.

[0016] The cranked shape of the honing stone holder, which is important for its use in honing both raceways of a standard wheel bearing, is evident both in the overall shape of the honing stone holder and in the course of the partially split lubricant channel running within it. Preferably, the honing stone is fixed in the honing stone holder between the two transition sections of the lubricant channel, which lie in a common plane and are parallel to the first section. A pressure block, adjustable via a screw mechanism and arranged within the honing stone holder, is particularly suitable for fixing the honing stone.

[0017] The two end sections of the lubricant channel, from which the cooling lubricant used in honing emerges, are typically aligned longitudinally along the honing stone and thus transversely to the shank of the honing stone holder. The first straight section of the lubricant channel, running within the shank, is typically longer than any other section of the lubricant channel. In contrast, the two end sections are preferably the shortest sections of the lubricant channel.

[0018] The two inclined sections are preferably connected to the first section via a transverse section oriented orthogonally to the first section. In a manufacturing advantage, with regard to the production of the honing stone holder, the transverse section, like the two inclined sections, is preferably closed on one side by a screw.

[0019] The honing tool is particularly efficient because it can be used to machine the first raceway of an outer ring and then the second raceway sequentially, starting from the same end face of the outer ring and being partially inserted into it. The bearing component being machined, specifically for a wheel bearing, is typically a double-row ball bearing.

[0020] An embodiment of the invention will now be explained in more detail with reference to a drawing. The drawing shows: Fig. 1 a honing stone holder of a honing tool in perspective view, Fig. 2 the honing stone holder in a sectional view, Fig. 3 the machining of a wheel bearing outer ring with the honing tool in a first machining phase, Fig. 4 the machining of the wheel bearing outer ring by the honing tool in a second machining phase.

[0021] A honing tool, designated overall with reference numeral 3, is intended for machining a workpiece 2, namely a wheel bearing outer ring. The [details of the following are missing from the original text] Figures 3 and 4 The sketched arrangement, which includes workpiece 2, i.e., wheel bearing part, and honing tool 3, is referred to as machining arrangement 1. Figure 3 Additionally, a pressure roller 6 is visible, which absorbs radial forces.

[0022] The workpiece 2 to be machined has a flange 4 which, in the installed state of the wheel bearing, is connected to a wheel carrier. Bores in the flange 4 are designated 5. The flange 4 is integrally connected to a cylindrical section 12 in which a first raceway 10 and a second raceway 11 are formed, which are to be machined with the honing tool 3. In the completed state of the wheel bearing, balls roll on the raceways 10 and 11 as rolling elements in a manner known per se. Overall, the wheel bearing, which comprises the wheel bearing part 2, is designed as a double-row angular contact roller bearing in an O-arrangement. Regarding the basic design of such a wheel bearing, reference is made to the prior art cited at the beginning.

[0023] The honing tool 3 includes one in the Figures 1 and 2The honing stone holder 7, also referred to simply as the holder, is shown in isolation. When using the honing tool 3, a honing stone 8 is fixed in the holder 7 by means of a pressure block 9. The honing stone holder 7 is traversed by a channel, designated 16 in total, which is partially split into two arms and is called a lubricant channel. This channel will be discussed in more detail below.

[0024] A cooling lubricant 13, also referred to simply as lubricant, is conveyed through channel 16 and is used for honing. The lubricant 13 is introduced through a connecting piece 18 into a straight, long section 17 of channel 16. The first straight section 17 of channel 16 extends through a shaft 15 of the honing stone holder 7. At its end opposite the connecting piece 18, the shaft 15 transitions into a widened section 19. Within this widened section 19 is a transverse channel 20, which connects to the first section 17 and is also part of channel 16. Angled channels 23 and 24 extend from the two ends of the transverse channel 20 and are located in an intermediate section 22, which bends obliquely from the area of ​​the holder 7 formed by the shaft 15 and the widened section 19 adjoining it.

[0025] The transverse channel 20, also referred to as the transverse section, is designed as a blind hole, which is closed by a screw 21 on a side surface of the holder 7. Similarly, the two inclined channels 23, 24, i.e., inclined sections of the lubricant channel 16, are closed by screws 25, 26.

[0026] The inclined sections 23, 24 transition into straight, short sections 27, 28 shortly before the screws 25, 26. These two straight, short sections 27, 28 are also referred to as transition sections and define a plane parallel to the plane in which the first straight section 17 of the channel 16 is located. Each of the short sections 27, 28 is closed by a screw 29, 30, which, with respect to the arrangement according to Figure 1 is located on the underside of the honing stone holder 7.

[0027] Above the screws 29, 30, end sections 31, 32 branch off at right angles from the straight, short sections 27, 28. The coolant 13 exits from the end sections 31, 32 in such a way that it is supplied to the machining area along the honing stone 8. The two machining areas, which are in the form of raceways 10, 11, are separated from each other by a central inner wall section 14. Due to the cranked shape of the honing stone holder 7, including the lubricant channel 16, each raceway 10, 11 is accessible from the same end face of the workpiece 2, whereby the lubricant 13 is supplied in each case specifically to the respective machining area. Reference symbol list

[0028] 1 Machining arrangement 2 Bearing part, workpiece 3 Honing tool 4 Flange 5 Bore 6 Pressure roller 7 Holder, honing stone holder 8 Honing stone 9 Pressure block 10 First raceway 11 Second raceway 12 Cylindrical section of workpiece 13 Lubricant 14 Middle inner wall area 15 Shank 16 Channel, lubricant channel 17 Straight, long section 18 Connecting piece 19 Widened section 20 Transverse channel, transverse section 21 Screw 22 Intermediate section 23 Inclined section of channel 24 Inclined section of channel 25 Screw 26 Screw 27 Straight, short section, transition section 28 Straight, short section, transition section 29 Screw 30 Screw 31 End section 32 End section

Claims

1. A honing tool (3) having a honing stone holder (7) in which a branching lubricant duct (16) is arranged, which has a first, straight section (17), two sections (23, 24) connected and positioned diagonally to the first section, and two transition sections (27, 28) adjoining these sections (23, 24) and arranged in a plane parallel to and spaced apart from the first section (17), characterised in that open end sections (31, 32) extend from the transition sections (27, 28) and are directed towards a plane parallel to the aforementioned plane and in which the first section (17) of the lubricant duct (16) is situated.

2. The honing tool (3) according to claim 1, characterised in that a honing stone (8) is fixed in the honing stone holder (7) between the two transition sections (27, 28) of the lubricant duct (16) lying in a common plane and parallel to the first section (17).

3. The honing tool (3) according to claim 2, characterised in that the two end sections (31, 32) of the lubricant duct (16) are aligned in the longitudinal direction of the honing stone (8).

4. The honing tool (3) according to any one of claims 1 to 3, characterised in that the first section (17) represents the longest section and the two end sections (31, 32) represent the shortest sections of the lubricant duct (16).

5. The honing tool (3) according to any one of claims 1 to 4, characterised in that the two diagonal sections (23, 24) are connected to the first section (17) via a transverse section (20) oriented orthogonally to the first section (17).

6. The honing tool (3) according to claim 5, characterised in that the transverse section (20) and the two diagonal sections (23, 24) are each closed on one side by a screw (21, 25, 26).

7. A method for machining a bearing part (2), in particular a wheel bearing, having the following steps: - providing a bearing part (2), namely an outer ring, through which two raceways (10, 11) for rolling elements are formed, - providing a honing tool (3) according to one of claims 1 to 6 formed from a cranked holder (7) and a honing stone (8) fixed therein, wherein the longitudinal direction of the holder (7) is given by a shaft (15) of the holder (7) and the honing stone (8) is designed as an elongate cuboid that forms a right angle with the longitudinal direction of the holder (7), and wherein the holder (7) is passed through a branching lubricant duct (16) within the holder (7), the outlet openings of which are arranged next to the honing stone (8), - machining the first raceway (10) of the outer ring (2) with the honing tool (3), wherein cooling lubricant (13) is passed through the lubricant duct (16) and directed in the longitudinal direction of the honing stone (8) onto the surface being machined, - machining the second raceway (11) of the outer ring (2) with the honing tool (3), wherein cooling lubricant (13) is again passed through the lubricant duct (16) and directed in the longitudinal direction of the honing stone (8) onto the surface being machined.

8. The method according to claim 7, characterised in that during the honing of the first raceway (10) and during the honing of the second raceway (11), the honing tool (3) engages in the outer ring (2) from the same end face thereof.

Images