JP2008290205A - Method and device for grinding stand-out of angular ball bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for grinding the stand-out of an angular ball bearing capable of enhancing productivity by shortening cycle time and increasing the yield of products. <P>SOLUTION: When the end surface of an inner ring 14 or an outer ring 13 is ground by a grinding wheel 61 brought into contact with the end surface from the opposite side of the rotating shaft 21 of the inner ring 14 or the outer ring 13 while detecting the actual stand-out of the end surface on the opposite side of the rotating shaft 21 of the inner ring or the outer ring rotated when the rotating shaft 21 is rotated by a stand-out detection means 51, the grinding is performed while washing the inside of the angular ball bearing 11 by a grinding fluid supplied to the rotating shaft side end surface of the angular ball bearing 12 through a grinding fluid flow passage 24 drilled in the rotating shaft 21. Consequently, the grinding chips are prevented from advancing into the bearing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a differential width grinding method and a differential width grinding apparatus for an angular contact ball bearing.

The angular ball bearing is a bearing configured such that a ball that is a rolling element and an inner ring and an outer ring that hold the ball have a predetermined contact angle, and can apply both a radial load and an axial load.
These angular ball bearings are used in combination, and a predetermined rigidity is obtained by applying a preload in the axial direction (thrust direction). At that time, the difference width between the inner ring and the outer ring corresponds to the preload grade. When it is not within the allowable range, bearing performance such as load resistance and vibration characteristics is impaired. Therefore, differential width grinding is required to make the differential width within the allowable range from the reference value.

As a differential width grinding method for angular contact ball bearings, first, in the assembled state, one ring end surface of the bearing was pressed against the reference surface, and the differential width of the inner and outer rings was measured from the other end surface side to calculate the grinding allowance. After that, after disassembling the bearing, grinding the amount calculated individually for each inner ring and outer ring, and then reassembling and then measuring the difference width, a method of repeating the difference is known. However, the method of disassembling and grinding has a problem that it takes a long time for disassembling and assembling, resulting in an increase in cycle time and poor productivity.
Further, at the time of disassembly / assembly, the balls and the rolling surfaces of the inner and outer rings may be damaged, and the product yield may be reduced due to damage to these bearing parts.

In order to solve these problems, a differential width grinding method and apparatus for differential width grinding of an angular ball bearing in an assembled state has been proposed.
In this differential width grinding method and apparatus, the angular ball bearing mounted in the assembled state at the end of the rotary shaft applies a predetermined axial load to the inner and outer rings, thereby generating a differential width between the inner and outer rings, The actual difference width is detected by the difference width detecting means that is in contact with the end surface on the opposite side of the rotation shaft of the inner ring or outer ring that rotates in conjunction with the rotation of the inner ring, and the difference width is within the allowable range from the reference value. The inner ring or the outer ring is subjected to end grinding with a grindstone that is in contact with the end face from the opposite side of the rotating shaft so as to be accommodated (see, for example, Patent Document 1).

JP 58-171258 A

However, in the conventional differential width grinding method and apparatus, as in the case of grinding a gear or the like, the coolant or the cleaning liquid is sprayed from the contact side of the grindstone to the grinding portion. For this reason, it is confirmed that grinding scraps easily enter the bearing, and immediately after the grinding process, the number of grinding scraps of 100 μm or more adhering to the ball bearing is about 200 to 500.
For this reason, after the grinding process, the angular ball bearing removed from the apparatus needs to be sent to another cleaning process to carefully clean the inside of the bearing.

  In addition, it is difficult to completely remove the fine grinding waste that has entered the bearing during the grinding process, and the remaining grinding waste may cause indentations on the bearing raceway surface, which may reduce the product yield. It was.

  Accordingly, an object of the present invention is to solve the above-mentioned problems, and angular ball bearings can be subjected to differential width grinding in an assembled state, and cutting scraps can be attached without performing cleaning treatment again after differential width grinding. The present invention provides a differential width grinding method and a differential width grinding apparatus for an angular contact ball bearing that can secure a clean angular ball bearing free from defects, improve productivity by shortening cycle time, and improve product yield. .

The above object is achieved by the following configuration.
(1) A predetermined axial load is applied to the inner and outer rings of the angular ball bearing attached in the assembled state to the end of the rotating shaft to create a differential width between the inner and outer rings, and in conjunction with the rotation of the rotating shaft. While detecting the actual difference width of the inner ring or the outer ring rotating by the difference width detecting means, the end face is brought into contact with the end face from the opposite side to the rotation shaft so that the difference width is within the allowable range from the reference value. A differential width grinding method for an angular ball bearing that performs end face grinding of the inner ring or the outer ring with a grindstone,
Grinding with the grindstone is performed while internally cleaning the angular ball bearing with the grinding water supplied to the end surface on the rotary shaft side of the angular ball bearing through a grinding water flow path drilled in the rotary shaft. A differential width grinding method for angular contact ball bearings.

(2) Angular ball bearings attached to the end of the rotating shaft in an assembled state give a predetermined axial load to the inner and outer rings to create a differential width between the inner and outer rings and interlock with the rotation of the rotating shaft While the actual difference width of the rotating inner ring or outer ring is detected by the difference width detecting means, the end face comes into contact with the end face from the opposite side to the rotation shaft so that the difference width falls within the allowable range from the reference value. A differential width grinding device for an angular ball bearing that performs end face grinding of the inner ring or the outer ring with a grindstone,
A grinding water flow path for supplying grinding water to the end surface on the rotary shaft side of the angular ball bearing is formed in the rotary shaft and a bearing holding member that fixes the angular ball bearing to the end of the rotary shaft, and
A grinding water supply means for supplying grinding water is connected to the grinding water flow path of the rotating shaft,
A differential width grinding apparatus for an angular ball bearing, wherein the grinding with the grindstone is performed while internal cleaning of the angular ball bearing is performed with grinding water supplied through the grinding water flow path.

The angular ball bearing differential width grinding method described in (1) above can be carried out by the angular ball bearing differential width grinding apparatus described in (2) above.
Then, in the angular ball bearing differential width grinding method described in (1) above, since the angular ball bearing is subjected to differential width grinding with the assembled state, it is not necessary to disassemble or reassemble the ball bearing. In addition, since the process of disassembling and reassembling the ball bearing is not necessary, the problem that the yield is reduced by damaging the balls and the rolling surfaces of the inner and outer rings can be solved.

  In addition, during differential width grinding, grinding water flows into the bearing from the end surface side opposite to the contact side of the grindstone through the rotating shaft that drives the angular ball bearing to rotate and the grinding water passage formed in the bearing holding member. Since it is injected and flows out to the grinding wheel side, grinding scraps are quickly washed out of the bearing and do not enter the bearing.

Hereinafter, preferred embodiments of a differential width grinding method and a differential width grinding apparatus for an angular ball bearing according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view of an essential part of a first embodiment of a differential width grinding apparatus for carrying out a differential width grinding method for an angular ball bearing according to the present invention.

  The angular ball bearing differential width grinding apparatus 1 shown in FIG. 1 performs differential width grinding on the outer ring 13 of the angular ball bearing 11 and is rotatably supported by a support mechanism (not shown) in the housing 20. The rotating shaft 21, the outer ring bearing holding member 31 that is assembled to the end of the rotating shaft 21 and holds the assembled angular ball bearing 11, and the angular ball bearing 11 that rotates in conjunction with the rotation of the rotating shaft 21. A differential width detecting means 51 that comes into contact with the end face of the outer ring 13 and a grindstone 61 that comes into contact with the end face of the outer ring 13 are provided.

  The angular ball bearing 11 has a plurality of balls 15 held at a predetermined pitch in an annular gap between the outer ring 13 and the inner ring 14, and the balls 15, the inner ring 14 and the outer ring 13 have a predetermined contact angle. It is configured to have.

  The outer ring bearing holding member 31 has a reference surface 32 a that is in contact with one end surface of the outer ring 13 and has a substantially cylindrical reference plate 32 fixed to the end of the rotating shaft, and a small diameter cylinder that fits to the inner periphery of the inner ring 14. An inner ring arbor 34 that holds the inner ring 14 by the part 34a, and a spacer 35 that fits to the outer peripheral part of the small diameter cylindrical part 34a and positions the end face of the inner ring 14 on the small diameter cylindrical part 34a.

  The outer ring bearing holding member 31 positions the end face of the inner ring 14 of the angular ball bearing 11 fitted to the small diameter cylindrical portion 34 a of the inner ring arbor 34 with the spacer 35, and then draws the inner ring arbor 34 into the reference plate 32. By pressing the outer ring 13 of the angular ball bearing 11 against the reference surface 32 a, a predetermined axial load is applied to the inner and outer rings 14, 13, and a difference width is generated between the inner and outer rings 14, 13.

The difference width detecting means 51 measures the actual dimension of the end face of the rotating outer ring 13 in the difference width direction by abutting the detection terminal 51a against the end face of the outer ring 13 which is a grinding surface, and detects the difference from the reference value. And output.
The difference from the reference value detected by the difference width detector 51 is used for setting a grinding allowance by the grindstone 61.
In the case of measuring the difference width at another position, the difference width detecting means 51 may be provided in one place as shown in the figure. However, when grinding is performed simultaneously while measuring the difference width, the difference width detecting means 51 is provided. An inner ring position detecting means (not shown) having the same configuration as 51 is used.

The grindstone 61 is supported by the rotating shaft 63 of the grinding machine, and when driven at a predetermined rotational speed, the end surface of the outer ring 13 is ground by the outer peripheral surface thereof.
The rotary shaft 63 is equipped so that its position can be adjusted in the direction of the central axis and in the direction orthogonal to the central axis. Based on the grinding allowance detected by the difference width detecting means 51, the rotary shaft 63 moves in the direction orthogonal to the central axis. The amount can be controlled automatically.
That is, the grindstone 61 grinds the end face of the outer ring 13 from the side opposite to the rotary shaft 21 so that the actual difference width of the outer ring 13 is within the allowable range from the reference value.
The grindstone shaft may oscillate in the direction of arrow C in the figure (small reciprocating motion) to aim for a crushing effect on the grinding surface.

In the case of the present embodiment, a grinding water channel 24 is formed on the central axis of the rotating shaft 21. One end of the grinding water flow path 24 is open at a rotating shaft end connected to the inner ring arbor 34, and the other end is connected to a grinding water supply means (not shown) connected to the other end side of the rotating shaft 21.
The inner ring arbor 34 fixed to the end of the rotating shaft 21 includes a first grinding water passage 34 c communicating with the grinding water passage 24, and a rotating shaft end side of the angular ball bearing 11 branched from the first grinding water passage 34 c. A second grinding water flow path 34d for guiding the grinding water between the inner and outer rings of the end face is formed.

  The inside of the angular ball bearing 11 can be cleaned with grinding water by the grinding water flow paths 24, 34 c and 34 d formed in the rotating shaft 21 and the outer ring bearing holding member 31.

Next, a method for performing differential width grinding on the outer ring 13 of the angular ball bearing 11 with the differential width grinding apparatus 1 will be described.
The angular contact ball bearing 11 attached in an assembled state to the end of the rotary shaft 21 by the outer ring bearing holding member 31 applies a predetermined axial load to the inner and outer rings 14 and 13 by drawing the inner ring arbor 34 into the reference plate 32. Thus, a difference width is generated between the inner and outer rings 14 and 13.

  Next, the rotary shaft 21 is rotationally driven to rotate the outer ring 13 of the angular ball bearing 11, while the detection terminal 51a of the difference width detecting means 51 is brought into contact with the end surface of the outer ring 13 opposite to the rotary shaft 21, The actual difference width in the outer ring 13 is detected.

  Then, grinding water is supplied into the angular ball bearing 11 from the rotary shaft side end face of the angular ball bearing 11 through the grinding water flow paths 24, 34 c, 34 d drilled in the rotary shaft 21 and the outer ring bearing holding member 31. While the inner ball bearing 11 is being cleaned, the outer ring 13 of the angular ball bearing 11 is viewed from the side opposite to the rotary shaft 21 so that the difference width detected by the difference width detecting means 51 falls within the allowable range from the reference value. The end face of the outer ring 13 is ground with the grindstone 61 that is in contact with the end face.

  In the angular ball bearing differential width grinding method implemented by the differential width grinding apparatus 1 described above, the angular ball bearing 11 is subjected to differential width grinding with the assembled state, so that it is not necessary to disassemble or reassemble the ball bearing 11. Become. Further, since the process of disassembling and reassembling the ball bearing 11 is not necessary, the problem that the yield of the balls 15 and the inner and outer rings 14, 13 is damaged and the yield is reduced can be solved.

Moreover, at the time of differential width grinding, it is opposite to the abutting side of the grindstone 61 through the rotating shaft 21 for rotationally driving the angular ball bearing 11 and the grinding water flow paths 24, 34c, 34d drilled in the outer ring bearing holding member 31. Since grinding water is injected into the bearing from the end face side and flows out to the grindstone 61 side, the grinding waste is quickly washed out of the bearing and does not enter the bearing.
Therefore, the cleaning process performed after the differential width grinding is reduced, and a clean angular ball bearing 11 free from cutting chips can be reliably secured.

  Therefore, by omitting the ball bearing disassembly and reassembly processes and reducing the cleaning process after differential width grinding, the cycle time during differential width grinding of the angular ball bearing 11 can be greatly shortened to improve productivity. In addition, it is possible to eliminate the damage of the bearing parts during the differential width grinding process and to improve the product yield.

  In addition, when the number of grinding scraps of 100 μm or more adhering to the ball bearing immediately after grinding by the above-described differential width grinding method was counted, it was about 0 to 10 and 200 confirmed in the case of the conventional grinding method. It was confirmed that the grinding process can be carried out while cleanly reducing from about ~ 500.

FIG. 2 is a plan view of an essential part of a second embodiment of a differential width grinding apparatus for carrying out the differential width grinding method for an angular ball bearing according to the present invention.
In the second embodiment, the same components as those already described in the first embodiment of FIG. 1 are simplified or omitted by giving the same reference numerals or equivalent reference numerals in the drawing. .

  The differential width grinding apparatus 2 according to the second embodiment performs differential width grinding on the inner ring 14 of the angular ball bearing 11, and is assembled to the end portion of the rotating shaft 21 and assembled in an assembled state. The configuration of the outer ring bearing holding member 31 that holds the bearing 11 is changed for grinding the inner ring.

The outer ring bearing holding member 31 in the differential width grinding apparatus 2 includes a substantially cylindrical reference plate 36 fixed to the end of the rotating shaft 21, a small diameter cylindrical portion 37 a fitted to the inner periphery of the inner ring 14, and the rotating shaft of the inner ring 14. An inner ring arbor 37 that has a reference surface 37c that contacts the side end surface and holds the inner ring 14, and a cylindrical shape that loosely fits to the outer periphery of the outer ring 13, and is fitted and attached to the outer periphery of the tip portion of the reference plate 36 with an inlay And a cup 38.
An end of the cup 38 is equipped with an outer ring presser 39 that presses the end surface of the outer ring 13 opposite to the rotary shaft 21.

  The outer ring bearing holding member 31 applies a predetermined axial load to the inner and outer rings 14 and 13 by attracting the outer ring 13 by the cup 38 and the outer ring presser 39 and by restricting the position of the inner ring 14 by the reference surface 37 c provided on the inner ring arbor 37. To give a difference width between the inner and outer rings 14 and 13.

  Also in the case of the outer ring bearing holding member 31, the inner ring arbor 37 communicates with the grinding water flow path 24 formed in the rotating shaft 21 in order to supply the cleaning liquid from the rotating shaft 21 side to the inside of the angular ball bearing 11. A first grinding water flow path 37e and a second grinding water flow path 37f that branches from the first grinding water flow path 37e and guides the grinding water between the inner and outer rings on the end surface on the rotary shaft end side of the angular ball bearing 11 are provided. Is formed.

  The differential width grinding apparatus 2 according to the present embodiment is obtained by changing the configuration of the outer ring bearing holding member 31 in order to grind the inner ring 14, and the detection terminal 51 a of the differential width detecting means 51 is fixed by the outer ring bearing holding member 31. It is in contact with the end face of the inner ring 14. Further, the grindstone 61 is also in contact with the end surface of the inner ring 14.

  Also in the case of the differential width grinding apparatus 2 described above, as in the case of the differential width grinding apparatus 1 of the first embodiment, the grinding water flow paths 24 and 37e formed in the rotary shaft 21 and the outer ring bearing holding member 31. , 37f, the grinding water is supplied into the angular ball bearing 11 from the rotary shaft side end surface of the angular ball bearing 11, and the differential width detecting means 51 detects the differential width while washing the angular ball bearing 11 internally. The end surface of the inner ring 14 is ground with a grindstone 61 that comes into contact with the end surface of the inner ring 14 of the angular ball bearing 11 from the side opposite to the rotating shaft 21 so as to be within an allowable range from the reference value.

  In the case of the angular ball bearing differential width grinding method performed by the differential width grinding apparatus 2 described above, as in the case of the first embodiment, the angular ball bearing 11 is differentially ground while being assembled. This eliminates the need for disassembling and reassembling the ball bearings, and injecting grinding water into the bearings from the end surface opposite to the contact side of the grindstone 61 to perform grinding while washing, so that grinding waste Is quickly washed out of the bearing and does not enter the bearing.

Therefore, by omitting the ball bearing disassembly and reassembly processes and reducing the cleaning process after differential width grinding, the cycle time during differential width grinding of the angular ball bearing 11 can be greatly shortened to improve productivity. In addition, it is possible to eliminate the damage to the bearing parts during the differential width grinding process and to improve the product yield.
In addition, as described above, in the differential width grinding apparatus 2, only the configuration of the outer ring bearing holding member 31 that holds the angular ball bearing 11 is changed from that in the first embodiment. It can be easily applied to the differential width grinding of both the outer ring and the inner ring by simply replacing the outer ring bearing holding member.

It is a top view of the important section which sectioned a part of a 1st embodiment of a differential width grinding device of an angular ball bearing concerning the present invention. It is a top view of the important section which sectioned a part of 2nd embodiment of the differential width grinding device of the angular ball bearing concerning the present invention.

Explanation of symbols

1, 2 Differential grinding machine 11 Angular ball bearing 13 Outer ring 14 Inner ring 15 Ball 21, 63 Rotating shaft 24 Grinding water flow path 31 Outer ring bearing holding member 32, 36 Reference plate 32a, 37c Reference surface 34, 37 Inner ring arbor 34c, 37e First 1 grinding water flow path 34d, 37f 2nd grinding water flow path 35 spacer 38 cup 51 differential width detection means 51a detection terminal 61 grindstone

Claims (2)

A predetermined axial load is applied to the inner and outer rings of the angular ball bearing mounted in the assembled state at the end of the rotating shaft, creating a difference width between the inner and outer rings, and rotating in conjunction with the rotation of the rotating shaft. While detecting the actual difference width of the inner ring or the outer ring by the difference width detecting means, a grindstone that is in contact with the end face from the opposite side of the rotating shaft so that the difference width is within the allowable range from the reference value. A differential width grinding method of an angular ball bearing that performs end face grinding of the inner ring or the outer ring,
Grinding with the grindstone is performed while internal cleaning of the angular ball bearing is performed with the grinding water supplied to the end surface of the angular ball bearing on the rotary shaft side through a grinding water flow path drilled in the rotary shaft. A differential width grinding method for angular contact ball bearings. Angular ball bearings attached to the end of the rotating shaft in an assembled state give a predetermined axial load to the inner and outer rings to create a differential width between the inner and outer rings, and rotate in conjunction with the rotation of the rotating shaft. While detecting the actual difference width of the inner ring or the outer ring by the difference width detecting means, the grindstone that is in contact with the end face from the side opposite to the rotating shaft so that the difference width is within the allowable range from the reference value A differential width grinding apparatus for an angular ball bearing that performs end face grinding of the inner ring or the outer ring,
A grinding water flow path for supplying grinding water to the end surface on the rotary shaft side of the angular ball bearing is formed in the rotary shaft and a bearing holding member that fixes the angular ball bearing to the end of the rotary shaft, and
A grinding water supply means for supplying grinding water is connected to the grinding water flow path of the rotating shaft,
A differential width grinding apparatus for an angular ball bearing, wherein the grinding with the grindstone is performed while internal cleaning of the angular ball bearing is performed with grinding water supplied through the grinding water flow path.

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