JPS635220B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention involves bringing a grindstone into contact with the inner surface (raceway surface) of an annular workpiece that is rotated while being supported on the main axis by a drive unit, and This invention relates to a super-finishing device for an annular workpiece in which the inner surface of the annular workpiece is super-finished by swinging a grindstone around a horizontal axis perpendicular to the main axis or vibrating in a direction perpendicular to the horizontal axis. . As the annular workpiece, outer rings such as ball bearings, self-aligning roller bearings, conical roller bearings, and cylindrical roller bearings can be used.

(Prior Art) Such a super-finishing apparatus performs super-finishing on an annular workpiece by rocking and vibrating a grindstone as described above, and is therefore composed of the following components. That is, a drive unit that rotates with an annular workpiece supported on the main axis by a shoe centerless method, a grindstone that contacts the inner surface (raceway surface) of the annular workpiece, and a drive unit that holds the grindstone. a holder arm; a pressure block that presses the grindstone against the inner surface of the annular workpiece through the holder arm;
A swinging section that is provided on the grindstone on a horizontal axis perpendicular to the main axis, and that swings the grindstone around the horizontal axis or vibrates in a direction perpendicular to the horizontal axis via a pressure block and a holder arm. It is made up of.

(Problems to be Solved by the Invention) By the way, when finishing an annular workpiece using the above-mentioned apparatus, there are the following problems.

Recent bearing precision is required to be higher year by year, and as a countermeasure in the bearing industry,
Two machines are prepared: a rough machining device equipped with a rough whetstone and a finishing machining device equipped with a finishing whetstone, and after finishing machining with the rough whetstone, the annular workpiece is transferred to the finishing machining device equipped with a finishing whetstone. There is. For this reason, two finishing machines are required to process and finish the annular workpiece, and when the annular workpiece is replaced, positional and center deviations occur, resulting in poor processing accuracy. The drawback is that it gets worse. In particular, when performing super-finishing with a finishing whetstone, precision of 1/100,000 mm is required, so misalignment or misalignment of the annular workpiece has a significant impact on machining accuracy.

(Purpose of the Invention) In view of the above points, the present invention has been developed to dramatically reduce the frequency of replacing the grindstone to half or less than the current level by using the same type of grindstone, and to use a single device. The present invention provides an excellent super-finishing device for annular workpieces that can perform both processing using a rough grindstone and super-finishing using a finishing grindstone.

(Structure of the Invention) A superfinishing apparatus for an annular workpiece according to the present invention includes a drive unit that rotates while supporting the annular workpiece on the main axis in a shoe centerless system, and A grindstone that contacts the inner surface (raceway surface) of an object, a holder arm that holds the grindstone, a pressure block that presses the grindstone against the inner surface (raceway surface) of the annular workpiece via this holder arm, and an oscillating unit that is provided on a horizontal axis perpendicular to the main axis and that swings the grindstone around the horizontal axis or vibrates in a direction perpendicular to the horizontal axis via a pressure block and a holder arm; In the super-finishing device for an annular workpiece, the pressure block supports a pivot shaft, and the holder arm and a second holder arm having the same length extend from the pivot shaft. , a grindstone is also held at the extended end of this second holder arm,
On the other hand, in order to separate the grindstone that is in contact with the inner surface (raceway surface) of the annular workpiece from the inner surface (raceway surface), the pressure block is moved in the axial direction of the oscillating section or in the direction orthogonal to the vibration direction. The oscillating portion is moved in a direction parallel to the main axis in order to move a grindstone which is movably provided and is spaced from the inner surface (orbital surface) of the annular workpiece in a direction along the main axis and away from the annular workpiece. It is configured to be movable.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of a superfinishing apparatus for an annular workpiece as an embodiment of the present invention, FIG. 2 is a side sectional view showing the support state of the annular workpiece W, and FIG. It is an AA sectional view.

In these figures, reference numeral 1 denotes a drive unit with a backing plate 2 attached to the tip of the main spindle, and the annular workpiece W is pressed onto the backing plate 2 by a pressure roller 3 on the main axis line a. supported and rotated. The outer periphery of the annular workpiece W is supported by a shoe 4. 5 is the annular workpiece W
6 is a holder arm that holds the grindstone 5, and 7 is a holder arm 6 that presses the grindstone 5 against the inner surface (orbit surface) Wi of the annular workpiece W. The pressure block 8 is a oscillation shaft (an aspect of the oscillation part) for oscillating the grindstone 5 around a horizontal axis b perpendicular to the main axis a as shown in FIG. 4A or B. . Swing axis 8
The oscillating movement of the pressurizing block 7 and the holder arm 6
It is transmitted to the grinding wheel 5 through. In order to swing the grindstone 5 around the horizontal axis b as described above by swinging the swing shaft 8, the swing shaft 8 is an extension of the horizontal axis b perpendicular to the main axis a on the grindstone 5. is placed above. This rocking motion of the rocking shaft 8 is created by a crank mechanism (not shown) and is transmitted to the rocking shaft 8 via the arm 9. This swing shaft 8 is rotatably fixed to the housing 10.

A pivot shaft 11 whose axis is oriented in a direction parallel to the horizontal axis b is supported on the pressure block 7, and from this pivot shaft 11 the holder arm 6 and a second holder arm having the same length as the pivot shaft 11 are supported. 12 is extended (see Figure 5). This second holder arm 12 also holds a grindstone 5. A swing cylinder 13 is connected to the base end side of the swing shaft 11 . The rotating cylinder 13 has a cylinder chamber 1 with a central angle of 270° (3/2πrad) as shown in the cross-sectional view in FIG.
A rotor 13b (center angle of 90 degrees) connected to the pivot shaft 11 at its center position is provided inside the cylinder chamber 13a, and the rotor 13b is inserted into the cylinder chamber 13a from appropriate positions on both end surfaces 13c and 13d of the cylinder chamber 13a. It is designed so that it can be rotated forward and backward. The rotation angle of the rotor 13b is 180° (πrad). This rotation of the rotor 13b causes the holder arm 6 and the second holder arm 1 to be connected via the pivot shaft 11.
Since the grinding wheel 2 rotates 180 degrees, if the grinding wheel 5 held by the holder arm 6 is worn out, the grinding wheel 5 held by the second holder arm 12 can be rotated to rotate around the inner surface (orbit) of the annular workpiece. The inner surface (raceway surface) Wi of the workpiece can be superfinished using the grindstone 5. However, in the illustrated state, the holder arms 6, 12 cannot be rotated due to the annular workpiece W being in the way, so the pressure block 7 and the swing shaft 8 are modified as described later. In the illustrated example, the pivot shaft 11 is provided parallel to the horizontal axis b, but since the pivot shaft 11 only needs to be able to pivot the holder arms 6 and 12, it is not necessary that it be parallel to the horizontal axis b. It's not an absolute requirement. Therefore, it can be carried out even in a state in which it is oriented in a direction diagonally intersecting the horizontal axis b.

In the above illustrated example, the grindstone is oscillated around the horizontal axis, but it goes without saying that the grindstone may be vibrated in a direction perpendicular to the horizontal axis.

The pressure block 7 has a swing shaft 8 so as to separate the grindstone 5 which is in contact with the inner surface (orbital surface) Wi of the annular workpiece from the inner surface (orbital surface) Wi.
It is provided so as to be movable in a direction perpendicular to its axis b. Specifically, as shown in FIGS. 3 and 5, a concave holder unit 14 is attached to the shaft end of the swing shaft 8, and a slide bar 15 and a piston rod 16 supported within this unit 14 are attached. A pressure block 7 is provided slidably. As shown in FIG. 7, the piston rod 16 is formed with a partially bulged piston portion 16a. On the other hand, the pressurizing block 7 is formed with a cylinder chamber 17 surrounding the piston portion 16a. Oil passages 16b, 1 formed on the axis of the piston rod 16
By alternately supplying pressurized oil to the cylinder chamber 17 through 6c, the pressurizing block 7 can be slid up and down along the slide bar 15. In the illustrated example, the grindstone 5 can be separated from the inner surface (orbital surface) Wi of the annular workpiece by upward movement of the pressure block 7. The lowering of the pressure block 6 is used to press the grindstone 5 against the inner surface (raceway surface) Wi of the annular workpiece.

Next, the swing shaft 8 is moved to the pressure block 7 as described above.
The inner surface (raceway surface) of the annular workpiece is
In order to move the grindstone 5 separated from Wi in a direction away from the annular workpiece W along the main axis a,
It is configured to be movable in a direction parallel to the main axis a. In the illustrated example, the casing 10 that supports the swing shaft 8 is dovetail-fitted to the stationary base 18 (see FIG. 3), and
The casing 10 is connected to a rod 19a of a telescopic cylinder 19 provided at one end of the base 18, and the casing 10 is moved along the main axis a by the telescopic operation of the telescopic cylinder 19.
This allows it to move in a direction parallel to the

According to the above configuration, the pressurizing block 7 is connected to the swing shaft 8.
, by moving it in a direction perpendicular to its axis b,
The grindstone 5 is separated from the inner surface (orbital surface) Wi of the annular workpiece, and then the swing shaft 8 is moved in a direction parallel to the main axis a to separate the grindstone 5 from the inner surface (orbital surface) of the annular workpiece. 5 in a direction away from the annular workpiece W, then operate the swing cylinder 13 to reverse the holder arms 6 and 12 by 180 degrees, and then move the swing shaft 8 and pressure block 7 in the opposite direction to the above. By moving the grindstone 5 in the opposite direction in the order of Can be super finished. Therefore, the second holder arm 12
If the same type of whetstone is held in the holder arm 6 side, if the whetstone 5 on the holder arm 6 side is polished, by rotating the holder arms 6 and 12 as described above, super finishing can be performed again with an unworn whetstone. is possible,
The frequency of replacing the grindstone can be halved. In addition, if the second holder arm 12 holds different types of grindstones,
For example, if the holder arm 6 holds a rough whetstone and the second holder arm 12 holds a finishing whetstone, the rough machining and finishing machining can be performed in a single device by rotating the holder arms 6 and 12. This can be done at For this reason, the annular workpiece W will not be misaligned or misaligned, making it possible to perform super finishing with high precision.

FIG. 8 to FIG. 16 show an example in which the present invention is applied to a superfinishing machine configured to vibrate a grindstone in a direction perpendicular to a horizontal axis. In the figure,
The same components and members as in the previous embodiment are given the same reference numerals.

To explain the differences from the above embodiments,
A vibrating section (a second form of the oscillating section) 21 that vibrates in a direction perpendicular to the horizontal axis is attached to a sliding shaft 22 fixed to the housing 10 so as to be freely slidable in the axial direction.
It is vibrated left and right in FIG. 8 by a drive source and a crank mechanism (not shown). This vibration is caused by unit 14,
This is transmitted to the whetstone 5 via the rotating cylinder 13 and the holder arms 6, 12, so that the whetstone 5 vibrates with a constant amplitude d in the horizontal direction perpendicular to the horizontal axis, as shown in FIG. This process superfinishes the inner surface (raceway surface) Wi of the annular workpiece into a flat cylindrical surface. However, depending on the type of the annular workpiece W, it is necessary to superfinish the inner surface (orbital surface) Wi of the annular workpiece W into a conical surface as shown in FIG.
In that case, the stationary base 18 may be configured to be tiltable in a plane perpendicular to the horizontal axis.

(Effects of the Invention) As explained above, in the super-finishing device for an annular workpiece according to the present invention, if the second holder arm also holds the same type of grindstone, the frequency of replacing the grindstone due to wear is halved. Or it can be reduced even more,
On the other hand, if different types of grindstones are held in the second holder arm, different processing methods such as roughing and finishing can be performed with a single device without removing the annular workpiece. Therefore, it is possible to process a super-finished surface with high precision.

[Brief explanation of the drawing]

1 to 7 show an embodiment of a superfinishing device for an annular workpiece according to the present invention, FIG. 1 is a partially cutaway plan view showing the entire device, and FIG. 2 is a superfinishing device for an annular workpiece. 3 is a sectional view taken along the line A-A in FIG. The front view, FIG. 6 is a sectional view taken along the line B-B in FIG. 1, FIG. 7 is a diagram showing the mechanism for moving the pressure block in a direction perpendicular to the horizontal axis, and FIGS. Another embodiment of the apparatus for superfinishing an annular workpiece according to the present invention is shown, FIG. 8 is a partially cutaway plan view showing the entire apparatus, and FIG. 9 is a supported state of the annular workpiece. Side sectional view, Figure 10 is C in Figure 8.
-C arrow view, FIG. 11 is a sectional view taken along the line D-D in FIG. The figure is a sectional view taken along the line E--E in FIG. 8, and FIG. 16 is a diagram showing a mechanism for moving the pressure block in a direction perpendicular to the horizontal axis. DESCRIPTION OF SYMBOLS 1... Drive unit, 5... Grindstone, 6... Holder arm, 17... Pressure block, 8... Swing shaft, 11... Rotating shaft, 12... Second holder arm, a... Main shaft Line, b...Horizontal axis, W...Annular workpiece, Wi...Inner surface (raceway surface).

Claims (1)

[Claims] 1. A drive unit that rotates with an annular workpiece supported on the main axis using a shoe centerless method, a grindstone that contacts the inner surface (raceway surface) of the annular workpiece, and a holder that holds the grindstone. An arm, a pressure block that presses the grindstone against the inner surface (raceway surface) of the annular workpiece through this holder arm, and a pressure block and a holder that are installed on the horizontal axis perpendicular to the main axis on the grindstone. In the superfinishing device for an annular workpiece, the apparatus includes a vibrating section that vibrates a grindstone around the horizontal axis via an arm or vibrates in a direction perpendicular to the horizontal axis. A rotating shaft is supported by the block, the holder arm and a second holder arm having the same length are extended from the rotating shaft, and a grindstone is also held at the extended tip of the second holder arm,
On the other hand, in order to separate the grindstone that is in contact with the inner surface (raceway surface) of the annular workpiece from the inner surface (raceway surface), the pressure block is moved in the axial direction of the oscillating section or in the direction orthogonal to the vibration direction. The oscillating portion is moved in a direction parallel to the main axis in order to move a grindstone which is movably provided and is spaced from the inner surface (orbital surface) of the annular workpiece in a direction along the main axis and away from the annular workpiece. A super-finishing device for an annular workpiece, characterized in that it is configured to be movable.