JPH06198505A - Working method of rolling bearing track ring - Google Patents

Abstract

PURPOSE:To work an oblique hole which is used for under lace lubrication or cooling easily by a simple machine tool. CONSTITUTION:This working method is applied to working for an inner ring 1 or an outer ring of a rolling bearing which has an oblique hole 2 penetrating in width direction. At first, an aximmetric counterbore 5 which is conical and so on, is provided on a width face of the inner ring 1 or the outer ring where the oblique hole 2 is positioned. The oblique hole 2 is formed by drilling obliquely from this counterbore 5. It is possible to work perpendicularly to the width face of the inner ring 1 or the outer ring by using an usual drill 6 etc. because the counterbore 5 is axisymmetric.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a rolling bearing race having an oblique hole for underrace lubrication and cooling.

[0002]

2. Description of the Related Art Bearings for machine tool spindles and the like are required to efficiently lubricate with little temperature rise even during high-speed rotation. Underlace lubrication is known to satisfy this requirement. FIG. 3 shows a schematic of an underlaced lubricated bearing. This bearing is of a deep groove ball bearing type in which a rolling element 53 is provided between the inner and outer rings 51, 52, and a through hole 54 is provided in the inner ring 51, and an oil supply hole 55 opened from the through hole 54 to the raceway surface 51a is provided. It is provided. Inner ring 5
1 has an annular scoop 56, which is a receiving portion for lubricating oil, on the width surface. The oil jet ejected from the jet nozzle 57 passes through the through hole 54 of the inner ring 51, and a part of the oil jet is supplied to the raceway surface 51 a through the oil supply hole 55.
The remaining oil penetrates the inner ring 51, cools the inner ring 51, and suppresses the temperature rise of the inner ring 51.

By the way, the oil jet nozzle 57 is
Since the injection direction is the same as the axial direction of the bearing, in order to efficiently enter the oil into the through hole 54 of the inner ring 51 rotating in the direction of arrow a in FIG. (The vector v _oiL is the velocity of the oil jet,
The vector v _BRG indicates the rotation speed of the inner ring 51, and the vector b indicates the combined speed thereof. ), It is desirable that the through holes 54 face the direction of the belt b. Therefore, the through hole 54 is formed obliquely with respect to the axial direction of the inner ring 55 as shown in FIG.

[0004]

When drilling such a through hole 54 in an oblique direction, the drill is slippery and cannot be processed as it is. Therefore, as shown in FIG. After cutting 58, drilling is performed. In order to process such an oblique spot facing 58, an end mill 59 as shown in FIG. 5, for example, is used. However, even when the end mill 59 is used, since machining is performed in an oblique direction, it is necessary to use a machine tool having a function of tilting the end mill main shaft, and the machine to be used is limited. In addition, a setup process for tilting the main shaft is required.

An object of the present invention is to provide a method of machining a rolling bearing race which can easily machine an oblique hole with a simple machine tool.

[0006]

The processing method of the present invention comprises:
This is a machining method for machining an oblique hole penetrating in a width direction in an inner ring or an outer ring of a rolling bearing. First, an axially symmetrical spot facing is provided on a width surface of an inner ring or an outer ring where the oblique hole is located. The oblique hole is formed by diagonally drilling from the spot facing.

[0007]

[Operation] The counterbore is machined into an axially symmetrical shape such as a conical shape. By making the seat surface inclined according to the inclination angle of the oblique hole, the oblique hole is drilled and slips occur. Can be done easily and accurately. Moreover, since the spot facing is axisymmetric, it can be easily machined by, for example, standing a large diameter drill axially with respect to the inner ring or the outer ring.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. This embodiment is an example applied to the processing of the inner ring of the deep groove ball bearing. The inner ring 1 is used for under-race lubrication, and oblique holes 2 penetrating in the width direction are formed at a plurality of positions in the circumferential direction. Each oblique hole 2 is provided with an oil supply hole 3 which opens to the raceway surface 1a. An annular scoop 4 for receiving oil is provided on the width surface 1a of the inner ring 1 on the oil jet inflow side into the oblique hole 2. The processing of the oblique holes 2 of the inner ring 1 as described above is performed by the following method.

First, at the positions where the oblique holes 2 are formed on the width surface 1b of the inner ring 1 on the oil jet outflow side, as shown in FIG.
The spot facing 5 is processed as shown in (A). The counterbore 5 has a shape in which the axis of symmetry 5a is axially symmetric (also referred to as rotational symmetry) in which the width surface of the inner ring 1 is vertical, and has a conical surface shape in this embodiment. The hole diameter φa of the spot facing 5 is at least twice the hole diameter φb of the oblique hole 2. This counterbore 5 is a large diameter drill bit 6
Is erected perpendicularly to the width surface of the inner ring 1 and processed by the blade edge 6a.

After this, as shown in FIG. 1B, the cross hole 2 is machined from the seat surface of the spot facing 5 by the drill cutting 7 having the hole diameter φb. The inclination angle θb of the oblique hole 2 is an angle perpendicular to the seat surface of the spot facing 5. Therefore, a drill bit 6 having a cutting edge angle in which the tilt angle θb ′ of the seat surface of the spot facing 5 matches the target tilt angle θb of the oblique hole 2 is selected for machining the spot facing 5. The tilt angle θb ′ of the cross hole 2 can be changed by adjusting the tilt angle θb ′ of the spot facing 5.

According to this machining method, the axially symmetrical counterbore 5 is machined in this way, and the oblique hole 2 is drilled from the counterbore 5. Therefore, the inclination angle of the seat surface of the counterbore 5 is set to an appropriate angle. By setting to 1, the oblique hole 2 can be accurately processed without causing slippage in the drill bit 7. Further, since the spot facing 5 is axisymmetric, it can be processed by using the normal drill cutting 6 as described above, and further, it can be processed perpendicularly to the width surface of the inner ring 1. Therefore, it can be easily processed with a simple machine tool.

The counterbore 5 may be formed by another tool instead of using a drill. Further, the shape of the spot facing 5 is not limited to the conical shape, and may be an axisymmetric shape such as a hemispherical shape. Further, the present invention can be applied in the same manner as described above when processing the oblique hole in the outer ring of the bearing.

FIG. 2 shows a reference proposal example of a method of processing the oblique holes 2. In this example, a groove 8 having a semicircular cross section is machined in the width surface 1b on the oil jet outflow side of the inner ring 1 along the radial direction, and a diagonal hole 2 is drilled from within the groove 8 as shown in FIG. To do. By drilling from the inside of the groove 8 as described above, the oblique hole 2 can be formed without slippage in the drill bit 7.
Can be processed. In this case, the inclination angle θb of the oblique hole 2 is adjusted by changing the angle of the drill bit 7. The grooves 8 are provided as many as the oblique holes 2. Therefore, the grooves 8 are radially formed. The groove 8 can be easily processed by using an ordinary milling machine or the like without using a special tool.

[0014]

According to the method of machining a rolling bearing race according to the present invention, an axially symmetrical counterbore is provided on the width surface of the inner ring or the outer ring, and a diagonal machining is performed from the counterbore to form an oblique hole. The diagonal hole can be easily machined with a simple machine tool.

[Brief description of drawings]

FIG. 1A is an explanatory view of a spot facing process showing an embodiment of the method of the present invention, and FIG. 1B is an explanatory view of a cross hole forming process corresponding to a cross section taken along the line BB.

FIG. 2A is an explanatory view of a spot facing process in a reference proposal example of a method for processing a bearing ring, and FIG.
It is explanatory drawing of the diagonal hole processing process corresponded to a B'line cross section.

3A to 3D are a schematic diagram and a velocity vector explanatory diagram showing a conventional underrace lubricated bearing from each direction.

FIG. 4 (A) is a partial side view showing an enlarged inner ring in the conventional example, and FIG. 4 (B) is a front view of the same part.

FIG. 5 is an explanatory view of a method for machining a spot facing according to the conventional example.

[Explanation of symbols]

1 ... Inner ring, 2 ... Oblique hole, 3 ... Oil supply hole, 5 ... Counterbore, 6,
7 ... drill

Claims (1)

[Claims] 1. A method for processing an inner ring or an outer ring of a rolling bearing having an oblique hole penetrating in the width direction, wherein an axially symmetrical counterbore is provided on the width surface of the inner ring or the outer ring in which the oblique hole is located.
A method of processing a rolling bearing race, wherein the countersunk hole is diagonally drilled to form the oblique hole.