JPH11300597A - Manufacture of metallic machined cage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability and life of a rolling bearing by barrel polishing a cage after machining a pocket for housing a rolling body on a cage material annularly machined by turning, and setting the hardness of an abrasive medium to about the same degree as the hardness of the rolling body. SOLUTION: In the manufacture of the cage body 4a of a cage 4 for holding a cylindrical roller 3 as a rolling body integrated between an outer ring and an inner ring, a cast material as material is roughly lathed to form the circumference, and cut into a prescribed length to provide a cage material, and this cage material are lathed to finish the inside and outside surfaces and end surface. A plurality of pockets 5 is formed by means of machining from one end surface, and a pinhole 7 is drilled in a column 6 between the pockets 5. A ring plate 4b separately formed on the cage body 4a is temporarily set by a pin 9 to assemble the cage 5, and the cage 4 is barrel polished by use of an abrasive medium having a hardness set to the same degree as the hardness of the rolling body 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a metal hollow cage in a rolling bearing.

[0002]

2. Description of the Related Art In general, a main motor mounted on a railway vehicle has a large load torque at the time of starting and is subjected to vibration and impact at high speed rotation. Large capacity cylindrical roller bearings are used.

[0003] In the above-described cylindrical roller bearing for high-speed rotation having a large load capacity, a metal hollow cage made of a high-strength brass casting or the like is usually employed.

[0004] This retainer is entirely formed by stamping, including a pocket for accommodating a cylindrical roller. In this milled cage, since burrs occur at the edges and the like at the openings of the pockets on the inner diameter side and the outer diameter side of the cage, an appropriate deburring operation is performed after the milling process, and a polishing process is further performed. I try to remove the burr.

As a polishing machine for polishing a metal cage, a centrifugal flow barrel polishing machine is known.

As shown in FIG. 7 (I), a centrifugal flow barrel polishing machine is arranged such that a plurality of barrel tanks 22 are arranged at equal intervals on a concentric circle of a rotation axis at an outer peripheral portion of a turret disk 21 so as to be rotatable. The barrel turret 22 is caused to carry out planetary movement by the rotation of the turret disk 21.

When polishing the cage, the barrel, polishing media (abrasive grains), compound,
After water, a rust preventive, and the like are added, the turret disk 21 is rotated to cause the barrel tank 22 to perform planetary movement.

[0008] During the planetary movement of the barrel tank 22, the filler 23 such as abrasive media filled therein moves to the outer peripheral side in the barrel tank 22 by centrifugal force, and forms a surface layer in contact with the space in the barrel tank 22. A fluid tank 24 that flows in the swirling direction is formed, and the retainer is polished by contact with the polishing media in the fluid tank 24, and burrs and the like are removed by the polishing.

[0009] After the polishing, the retainer is removed by washing such as water washing or ultrasonic washing. After that washing,
It is immersed in hot water of about 50 ° C., and then dried by blowing air or the like.

[0010]

In the above-mentioned polishing treatment of the cage, a polishing medium mainly containing aluminum oxide (alumina) has been generally used as a polishing medium. This aluminum oxide is 1700-
Since the retainer has a hardness of about 2000 Hv, the retainer can be very effectively polished, but fine aluminum oxide may remain in the surface of the retainer.

As described above, the retainer removes the deposits by washing after the polishing process. However, as described above, if the aluminum oxide is buried, it cannot be removed. .

Therefore, in a cylindrical roller bearing in which a cylindrical roller is held by a cage which has been barrel-polished by a polishing medium mainly composed of aluminum oxide, the cylindrical roller wears due to contact with aluminum oxide remaining in the cage. In some cases, problems such as grease deterioration may occur due to the induction of the grease or the mixing of the wear powder into the grease.

Generally, rolling bearings and the like for supporting a rotating shaft of a main motor mounted on a railway vehicle are regularly inspected when a predetermined traveling distance is reached to inspect the rolling bearings. In order to extend the period and reduce maintenance and inspection costs, there is a demand for a highly reliable rolling bearing for high load and high speed rotation.

An object of the present invention is to provide a method for manufacturing a metal-made metal cage which can improve the reliability and life of a rolling bearing for high load and high speed rotation without adding a processing step. That is.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, in the present invention, a step of turning a cage material in an annular shape, and punching a pocket for accommodating a rolling element in the annular cage material. The method includes a step of processing and a step of barrel-polishing the cage in which the pocket is formed, and adopts a configuration in which the hardness of the polishing media used in the barrel polishing step is substantially equal to the hardness of the rolling elements.

Here, the barrel polishing may be a centrifugal flow barrel polishing or a vibration tumbler. The hardness of the polishing media used for the barrel polishing is 500 to 800 Hv because the hardness of the rolling elements is about 650 to 800 Hv.
About 850 Hv is preferable. Examples of such polishing media include those mainly containing silicon oxide.

By adopting the above configuration, even if the polishing media remains in the cage after polishing, the polishing media has almost the same hardness as the rolling elements. There is no problem such as deterioration of the rolling bearing and grease, the life and reliability of the rolling bearing are improved, the maintenance and inspection period can be extended, and the maintenance and inspection cost can be reduced.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cylindrical roller bearing as a rolling bearing. This cylindrical roller bearing comprises an outer ring 1, an inner ring 2, a cylindrical roller 3 as a rolling element incorporated between the two wheels 1, 2, and a retainer 4 for holding the cylindrical roller 3.

The cylindrical roller 3 is made of high carbon chromium bearing steel or the like and is quenched, and has a surface hardness of 650 to 800H.
v. On the other hand, the retainer 4 is made of a high-strength brass casting and has a hardness of about 100 Hv.

As shown in FIGS. 2 to 4, the retainer 4
A plurality of pockets 5 are formed in the cage body 4a at equal intervals in the circumferential direction, and are provided between adjacent pockets 5. The cage body 4a includes a cylindrical retainer body 4a and a ring plate 4b abutted on the end surface thereof. A pin hole 7 penetrating through both end surfaces of the pillar 6 is formed. On the other hand, the ring plate 4b has
A pin hole 8 is formed at a position facing the pin hole 7, and the retainer main body 4a and the ring plate 4b are integrated by caulking a pin 9 inserted into the pin holes 7, 8. The cylindrical roller 3 includes a retainer body 4a and a ring plate 4
In a stage before the integration with b, it is inserted into the pocket 5 of the retainer main body 4a.

FIG. 5I shows a manufacturing process of the retainer main body 4a. In forming the retainer main body 4a, a solid rod-like or pipe-like cast material is used as a raw material. This cast material is first rough-turned in outer diameter, and then cut to a predetermined length after the rough turning. The cage material formed by cutting is
Finish the outer diameter surface, inner diameter surface, end surface, etc. by turning. FIG. 5 (II) shows the cage material 10 after the turning.

Next, as shown in FIG. 5 (III), the cage material 10 is cut out from one end face by
A plurality of pockets 5 are formed. At this time, burrs 11 as shown in FIG. 6 (I) are formed at the edges of the openings of the pocket 5 that open on the outer and inner diameter surfaces of the cage.
The large burrs 11 are removed by sanding or the like as necessary.

After the pocket 5 is machined, the pocket 5
A pin hole is formed in the pillar 6 formed therebetween, and after the hole is formed, the retainer body 4a and a separately formed ring plate 4b are temporarily set by a pin to be inserted into the pin hole, and the retainer 4 is assembled. The cage 4 is barrel-polished. After barrel polishing, the retainer body 4a is washed, immersed in warm water of about 50 ° C. to remove oil, and then dried by blowing air.

Here, when the barrel of the cage 4 is polished,
A centrifugal flow barrel polishing machine 20 shown in FIG. 7 (I) is used.
In the barrel polishing, if the hardness of the polishing media is too low, the burrs 11 cannot be removed effectively, and polishing takes time. On the other hand, if the hardness is too high, the polishing media buried in the retainer 4 cannot be removed by washing as described above, and abrasion is induced on the cylindrical roller 3 by contact with the remaining polishing media. May occur.

For this reason, as a polishing media, 500
It is preferable to use a polishing media having a hardness of about 850 Hv. Such abrasive media can include natural silica sand. Table 1 shows the components of the natural silica sand and contains silicon oxide as a main component.

[0026]

[Table 1]

The natural silica sand containing silicon oxide as a main component as described above contains a small amount of aluminum oxide.
This is not a problem. This natural silica sand is mixed with a binder and formed into a predetermined shape. As the binder, an unsaturated polyester resin can be used. The unsaturated polyester and the above-mentioned natural silica sand are blended by 50% each to form a bullet-shaped abrasive media. FIG. 7 (II) shows the formed polishing media 12, 13 shows natural silica sand as abrasive grains, and 14 shows an unsaturated polyester resin as a binder. By polishing the cage 4 with the centrifugal flow barrel polishing machine using the polishing media 12, the burrs formed at the edges of the pockets 5 are removed and rounded as shown in FIG. 6 (II). .

The cage 4 after polishing is washed in the same manner as described above. Even if the polishing media remains in the retainer 4 due to the cleaning, the hardness of the polishing media is substantially the same as the hardness of the cylindrical rollers 3 housed in the pockets 5. Wear can be suppressed. In addition, the amount of abrasion powder mixed is also smaller than that of a cage polished using a polishing medium mainly composed of aluminum oxide.
It can be suppressed to about 1/2 to 1/3, and the problem due to the deterioration of the grease due to the mixing of the wear powder is extremely reduced, and the life and reliability of the bearing can be improved.

In the embodiment, the cylindrical roller bearing having the outer ring 1 and the inner ring 2 is shown as the cylindrical roller bearing, but the type of the cylindrical roller bearing is not limited to this. For example, FIG.
As shown in (I), an inner ring 2 having a raceway surface formed on the outer periphery, a cylindrical roller 3 and a machined cage 4,
As shown in FIG. 8 (II), it may be composed of an outer ring 1 having a raceway surface formed on the inner periphery, a cylindrical roller 3 and a machined cage 4. Alternatively, as shown in FIG.
It may be composed of a cylindrical roller 3 and a punching retainer 4.

Further, in the embodiment, a cylindrical roller bearing has been described as an example of a rolling bearing. However, the rolling bearing is not limited to this, and may be, for example, a ball bearing, a self-aligning roller bearing, a tapered roller bearing, or the like. You may. In the case of a ball bearing cage, pockets are formed by drilling from the radial direction.

[0031]

As described above, in the present invention, since the polishing media used in the barrel polishing step has the same hardness as the rolling elements, the polishing media remains in the retainer by washing after barrel polishing. However, wear of the rolling elements due to contact with the remaining abrasive media and deterioration of grease due to the mixing of abrasion powder can be suppressed, and the bearing life and reliability of rolling bearings can be improved without additional processing steps Can be achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a rolling bearing according to the present invention.

FIG. 2 is a cross-sectional view of a state where the retainer is cut at a pillar portion of the cage.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is an exploded perspective view showing a part of the cage.

FIG. 5 (I) is a block diagram showing a manufacturing process of the retainer main body, and (II) and (III) are perspective views of an intermediate product formed at the manufacturing stage.

FIG. 6 (I) is a cross-sectional view showing a state after the pocket is removed, and (II) is a cross-sectional view showing the state after barrel polishing.

FIG. 7 (I) is a schematic view of a centrifugal flow barrel polishing machine, (I)
I) Cross section of polishing media

8 (I), (II) and (III) are cross-sectional views showing another example of the cylindrical roller bearing.

[Explanation of symbols]

 10 cylindrical body 12 polishing media

Claims (4)

[Claims] 1. A method of manufacturing a metal blank cage, comprising the steps of: turning a cage material in an annular shape; and blanking a pocket for accommodating a rolling element in the annular cage material. A step of barrel-polishing the cage in which the pockets are formed, wherein the polishing media used in the barrel polishing step has the same hardness as the rolling elements. . 2. The method according to claim 1, wherein the barrel polishing is centrifugal flow barrel polishing. 3. The polishing medium has a hardness of 500-8.
The method according to claim 1, wherein the metal cage is 50 Hv. 4. The method according to claim 1, wherein the polishing media contains silicon oxide as a main component.