JPS5947525A - Positioning method of rotor and device thereof - Google Patents

Abstract

PURPOSE:To make the positioning of a rotor performable ever so easy, by setting the rotor afloat a little from its supporting position in a way of blowing a pressurized fluid upon it from the lower part, while rolling the rotor whose center of gravity is in an eccentric position so as to cause it to come to the lowest position. CONSTITUTION:In time of ball arrangement in a process of assembling a deep race type ball bearing, a bearing assembly body 4 as a rotor is placed right on a cylindrical receiving surface 6'a of a work receiving jig 6' by way of a chute. Next, compressed air 12 out of a compressor 11 is fed to an air passage 10 open to the almost central part of the said receiving surface 6'a and blown out of an opening 13 whereby the bearing assembly body 4 is set afloat slightly. With this, the bearing assembly body 4 whose center of gravity is in an eccentric position due to the maldistribution of balls 3 is rolled to some extent and thereby its position is compensated so as to cause these balls 3 to come to the lower semicircumferential limits or so as to make the center of gravity come to the lowest position so that the bearing assembly body 4 is positioned right on the jig 6'.

Description

[Detailed Description of the Invention] The invention relates to a method and apparatus for positioning a rotating body that automatically positions a workpiece in the shape of a rotating body such as a sphere or a cylinder to a predetermined rotational position during a machining process or the like. be.

In the assembly process of a deep groove ball bearing, as shown in FIG. 1(a), an inner ring 2 is placed eccentrically inside an outer ring 1, and balls 3... After assembling the bearing assembly 4, press the inner ring 2f as shown by the arrow P in the figure and position it concentrically with the outer ring 1 as shown in Fig. 1(b). As shown in 1 [m(0), the chute 5 transfers the sheeter (intermittent feed system @
), these bearing assemblies 4... are placed one by one according to the machining cycle, and the workpiece receiver is placed on the jig 6 and subjected to the post-process rounding and slicing.

This ball gathering and ball splitting process is shown in Figure 2 (a), (
As shown in FIG. 1(d), the workpiece receiver is placed between the inner and outer ring raceways of the bearing assembly 4 waiting on the jig 6. The cylinder 8a is used to force the balls 3 to be unevenly distributed in the lower half circumferential area between the inner and outer ring raceways, while the cylindrical end has a plurality of comb-teeth separators 9a. ) is shown in front view and side view, respectively.
In parallel with the above-mentioned pushing between the inner and outer ring raceways in step b, the beading jig 7 is gradually released from between the inner and outer ring raceways, and the protrusion length Kl is
Each separator 9a of the ball splitting jig 9 changed into a spiral shape...
As the separators 9a... are inserted in sequence, the space occupied by the ball shifting jig 7 is reduced by the amount of the separator 9a..., so that the balls 3... are evenly arranged between the inner and outer ring raceways, and the retainer This allows for the installation of the

However, in the process of pushing the balling jig 7,
If the balls 3 of the bearing assembly 4 on the jig 6 are not located in the lower half of the workpiece holder and are placed unevenly in the upper half of the circumference, as shown in FIG. The tip of the shifting jig 7 collides with the uppermost ball 3', and the ball 3... and the inner and outer rings 2
・If excessive force is applied to 1, it will cause damage to these members.

In order to prevent this kind of inconvenience, the workpiece holder must be installed by checking the positions of the balls 3 of the bearing assembly 4 that are sequentially placed on the jig 6, so that the balls 3... It is necessary to correct the foil each time so that the workpiece is in the half-circumference area, but if the position detection sensor and position correction means are placed near the jig, the assembly equipment will not be complicated and expensive, but it will be easier to Care must be taken to prevent the tool 7 and the ball splitting jig 9 from interfering with these position detection sensors and place 1 correction means.
Conventionally, workpiece position correction has not been performed in this type of assembly process.

The overall object of the present invention is to provide a method and a positioning device for a rotating body, which can extremely easily position the entire rotating body, such as a bearing assembly, at a predetermined rotational position in the bearing assembly process. be.

The outline of the method for positioning a rotating body according to the present invention is to support the rotating body so that its axis is oriented sideways, and spray pressurized fluid downward to slightly float the rotating body above the supported position. The workpiece holder is used to position a rotating body with its center of gravity at an eccentric position by rolling it so that its center of gravity is at the lowest position. An example in which the above-mentioned bearing assembly 4 (1st (2) (b)) placed on a jig is applied as a rotating body,
This will be explained below based on FIGS. 5 and 6.

The bearing assembly 4f is intermittently sent through the chute under the control of the seater: the workpiece holder to support it is a holder 6', and the cylindrical holder along the outer peripheral surface of the bearing assembly 4 has a surface 6 at its upper end. / a and stop the bearing assembly 4 so that its axis is in a horizontal position, while the workpiece holder is held in the jig 6.
The cylindrical receiver forms a ventilation passage 10 that opens approximately at the center of the surface 6'a, and the compressor 11 connected to this ventilation passage 10 sends compressed air 12 through the cylindrical receiver to the surface 6'a. By spraying through the opening 13, the cylindrical bearing slightly lifts the bearing assembly 4 on the surface 6/a, and due to the uneven distribution of the balls 3... While the assembly 4 is floating, it is moved as shown by the arrow mark P' in FIG. In other words, the center of gravity is corrected by 1h so that the center of gravity is at the lowest position, and the opening 13 of the air passage 10 has a long side a1 approximately equal to the radius R1 of the bearing assembly 4, and a short side b1. is a rectangle approximately equal to /2 of the width W of the bearing assembly 4, has an opening area sufficiently large compared to the cross-sectional area of the air passage 10, and has a depth dimension of about 2u + i + k,
This opening 13 is used as an air reservoir to allow the bearing assembly 4 to float stably.

In this embodiment, a case has been described in which the rotating body for positioning is the bearing assembly 4 of a deep groove ball bearing, in which the workpiece is supported on the jig 6' before the rolling process, but the present invention is not limited to this. As shown in Figure 7 (a) and (b), there is an eccentric hole 4' inside.
The present invention can be similarly applied to a cylindrical workpiece 4' whose center of gravity G is offset from the axis because of a..., and where the workpiece holder is positioned 812 on the jig 6''.

In addition, in the case of a cylindrical rotating body like this work 4', the width dimension V is small and the work holder is placed in the jig 6 in a stable state.
If the workpiece cannot be supported above the jig 6, as shown in FIG.
may be installed vertically to prevent the rotating body from falling during levitation.

In addition, as a rotating body for positioning, for example, as shown in Fig. 8, there is a sphere 4'' whose center of gravity is eccentric from the center of the ball and has a portion 4''a of different materials with different specific gravity. In this case, the workpiece holder is a jig 6'', the surface 6''a is a spherical surface along the outer peripheral surface of the sphere 4'', and the opening 13'' is approximately the radius R3 of the sphere 4''. The shapes are circular with the same diameter a3, and the depth d3 is about 2 fins.

In addition, on each of the above sides, the opening 13+13'113"
long side al l a2, short side b1, b2, diameter a
3. Depth dimensions (each dimension of 11td2 1d3, pressure of compressed air system 2, air supply level, etc.) should be set appropriately according to the weight, external dimensions, etc. of the rotating body to be applied, so that the rotating body can receive the workpiece. It is sufficient to allow the jig to float slightly above the jig.

In the above embodiment, the compressed air 12 from the compressor 11 is used as a device for this positioning method.
13 Although the structure is designed to blow out water, it is of course possible to use pressurized water or pressure oil to float the rotating body.

In addition, with regard to workpiece holders, jigs are not limited to those that support the rotating body with a surface, and supports that support the rotating body with multiple fulcrums, while supports along the rotating surface of the rotating body are Various configurations are possible, such as arranging a ventilation pipe having a nozzle in an expanded shape along the rotation body below the rotating body.

The method for positioning a rotating body according to the present invention is to support the rotating body so that its axis is oriented sideways, and spray pressurized fluid from below to float the rotating body slightly above the supported position. The positioning device of the present invention is configured to position a rotating body having a center of gravity at the lowermost position by rolling the rotating body so that the center of gravity is at the lowest position. A support surface is formed entirely along the rotating surface, and a pressurized fluid jet port is opened in the support surface, and a pressurized fluid supply means is communicated with the pressurized flow jet port and directed upward from the support surface. Since the pump is designed to send out pressurized fluid, the following effects can be obtained.

(b) According to the above positioning method, the rotating body is reliably positioned at a rotational position where the center of gravity automatically and within translation moves around to the lowest position due to the moment applied due to the eccentric position of the center of gravity. It is not necessary to confirm the position of the support and support before positioning processing, and the positioning can be performed extremely easily.

In particular, if the center of gravity is biased due to an imbalance in the material or structure inside the rotating body, it is usually not possible to confirm the rotational position from the outside, so it is difficult to determine the position of such a rotating body. By applying this, the positioning work can be performed more easily.

(b) Also, since the rotating body is floated by pressurized fluid, it is possible to roll the rotating body without contacting the supporting member, and there is no damage to the rotating body during the positioning process. .

(c) If this positioning method is applied to the process of placing the workpiece holder on a jig so that there is no inconvenience in the ball-clamping process, the bearing assembly before ball splitting with balls inserted between the inner and outer raceway can be applied. It is possible to position the unevenly distributed balls between the inner and outer ring raceways so that they are located in the lower half of the circumference. Accidents such as damage to the bearing assembly due to collision with the rolling jig can be prevented.

B) According to the above positioning device, the configuration is simple as there is no need for a sensor for detecting the rotational position or a tentacle for position correction, and the receiver of the bearing assembly can be mounted on a jig, etc. Even when used for this purpose, since there are no sensors or tentacles, it does not interfere with the operation of other assembly means such as a ball gathering jig or a ball splitting jig, and is easy to install.

[Brief explanation of the drawing]

Figures 1 (a) to d) are explanatory diagrams showing the assembly process of deep groove ball bearings, Figures 2 (=) and ' (b) are respectively a front view and a side view of the main parts of the rolling jig, and Figure 3 Figure (a),
(b) is a front view and a side view of the main parts of the ball splitting jig, Figure 4 is a plan view of the bearing assembly, and Figures 5 (a) and (b).
6 is a front sectional view and a side sectional view respectively showing the first embodiment of the present invention, FIG. 6 is a front sectional view showing the state after positioning processing, and FIGS. 7(a) and (b) are respectively the present invention. FIG. 8 is a front sectional view and a side sectional view showing a second embodiment of the invention, and FIG. 8 is a front sectional view showing a third embodiment of the invention. 4, 4', 4"...Rotating body (bearing assembly, workpiece, sphere), 61, 61', 6///...Rotating body support means (workpiece support is jig), 61 a, 611a,
61'1 a,, support surface (cylindrical support is surface,
10.10', 10"...ventilation passage, 11.
... Pressurized fluid supply means (compressor), 12...
Pressurized fluid (compressed air), 13113' + 13"...
- Pressurized fluid outlet (opening) Applicant: Koyo Seiko Co., Ltd.

Claims (4)

[Claims] (1) Support the rotating body so that its axis is oriented horizontally,
It is characterized by spraying pressurized fluid from below to float the rotating body slightly above the supporting position, thereby rolling and positioning the rotating body, which has its center of gravity at an eccentric position, so that its center of gravity is at the lowest position. How to position a rotating body (2) A method for positioning a rotating body according to claim (1), wherein the rotating body is a sphere. (3) A method for positioning a rotating body according to claim (1), wherein the rotating body is a cylindrical body. (4) The cylindrical body is made up of an inner and outer ring and a plurality of rolling elements that are inserted between the raceways of the inner and outer rings and unevenly distributed in a part of the circumference.
A method (5) for positioning a rotating body as set forth in claim (3), which is a bearing assembly. A rotating body positioning device consisting of a rotary body support means with an opening, and a pressurized fluid supply means that communicates with a pressurized fluid jet port and sends pressurized fluid upward from the support surface.