JPS59185531A - Production of halved annular outer ring for bearing - Google Patents

Abstract

PURPOSE:To produce continuously a titled outer ring having excellent out-of- roundness and mechanical strength with high efficiency by forming a round steel wire rod into a square shape, forming the wire rod into a ring body on a circular mandrel, and welding the joint surfaces thereof on an insulating core body then pressing a ball rolling surface. CONSTITUTION:A steel wire rod having a circular section is formed into a steel wire rod B having a square section and thereafter the formed wire rod is placed at the top the circular mandrel 24 of a ring forming device 18 by means of a fixed size delivery device. The upper pressing head 18a of the device 18 and the movable blade 23a of a cutter 23 are actuated simultaneously downward to cut and curve semicircularly the rod B and in succession, the curved rod is formed into a ring body by means of side pressing heads 18c, 18c and a lower pressing head 18b. Such body 13 is moved onto an insulating core body 24a by a transfer device 22 and the joint surfaces of the ring body are welded by a welder 19. The ring body 13 is thereafter moved to a ball rolling surface former, where a ball rolling surface 2a' is formed by a pressing system in one side end on the inside circumferential surface of the body 13 and at the same time, the out-of- roundness of the body 13 is corrected. An annular outer ring 1 is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to an improvement in a method for manufacturing a ring-shaped split outer ring mainly used in press hair links.

Conventionally, in so-called press bearings, a combination in which ring-shaped outer ring pieces 1 having a shape as shown in FIG. 1 are combined to face each other to form an outer ring 2 has been widely used. That is, the second
As shown in the figure, by combining two ring-shaped outer ring pieces 1.1 and pressing and holding them together with a case 3, an outer ring 2 is formed, and the ball rolling grooves 2a of the outer ring 2 and the balls of the inner ring 4 are formed. A bearing is constructed by interposing balls 5 at the gates of the rolling grooves 4a.

Until now, the ring-shaped outer ring piece 1 used in the above-mentioned grooved bearing has been manufactured using pipe material. That is, after cutting the pipe material to appropriate dimensions, one side of the inner peripheral surface of the pipe material is turned to form the transfer surface 2 for the ball rolling groove.However, when using the pipe material, The disadvantage is that the cost of the material itself is high, making it impossible to reduce manufacturing costs. Therefore, the applicant first developed a method of manufacturing the ring-shaped outer ring piece 1 from wire rod without using pipe material, and applied this method in the patent application filed in 1983.
It is published as No.-86348. That is, as shown in FIGS. 3 and 4, a copper wire A with a circular cross section wound around a drum is sent by a feeding device 7 to a forming device 8, where it is formed into a steel wire B with a square cross section. , the wire rod B is cut into a fixed size by the fixed size feeding device 9 and the fixed size cutting device 10.

Next, the cut wire B is bent into a ring shape using the circular core bar 11 and the plurality of pressing heads 12a and 12b, and then the ring body 13 is intermittently rotated using the circular core bar 11 as a guide. Cut holding part 1 of moving turntable 14
5, and the welding machine 16 welds the joint surfaces 17 at both ends of the ring body 130 while rotating the turntable 14 intermittently. After welding, the ring body 13 is subsequently sent to a turning process (not shown), where one side of its inner peripheral surface is turned to form a ball transfer surface 2 for forming ball rolling grooves 2a.
It forms the

The method for manufacturing the ring-shaped outer ring piece according to the above-mentioned Japanese Patent Application No. 52-86348 enables a significant reduction in manufacturing costs compared to the case of using conventional pipe materials, and has high practical utility. . However, the ring body 13 curved by the circular core metal 11 and the pressing heads 12a, 12b,
Since the core metal 11 is dropped onto the turntable apricot as a kite and the joint end surface 17 is welded with the core metal 11 removed from the core metal 11, both ends of the ring body 13 do not come into contact accurately during welding. However, there is a problem in that the rate of occurrence of defective products 9 due to the gaps and steps between these joining end surfaces 17 is extremely high.

Also, when welding the joining end surface 17, the ring body 13 inevitably
There is a problem in that distortion occurs in the ring body 13, making it difficult to manufacture a ring body 13 with accurate roundness, and only ring bodies 13 with low circularity being obtained.

Further, in order to form a ball transfer surface 2, a ring body 1 is provided.
3 is cut using a lathe, but this combined with the low roundness of the ring body 13 as described above makes the work of forming this transfer surface 2' extremely complicated, and the ring shape There is a drawback that the manufacturing cost of the outer ring piece 1 cannot be significantly reduced.

The present invention aims to solve the above-mentioned problems in the production of conventional outer rings for press bearings of this type, and aims to produce balls that have high roundness, excellent mechanical strength, and are smooth. The object of the present invention is to provide a method for manufacturing a ring-shaped split outer ring of a bearing, in which a ring-shaped outer ring piece having a rolling surface 2' can be manufactured continuously from a round steel wire with high efficiency.

In the present invention, a steel wire rod with a circular cross section is made into a steel wire rod with a square cross section using a forming device, and then the steel wire rod is fed into a ring manufacturing device in fixed size increments by a fixed size feeding device. The steel wire rod is placed above a circular core metal arranged horizontally, and the upper drum head of the ring forming device and the movable blade of the cutting device are simultaneously operated downward to cut the steel wire rod. is bent semicircularly along the core metal, and then the side and lower drums of the ring forming device are operated in a direction perpendicular to the axis of the core metal to form a ring body, and then the ring body is bent into a semicircular shape along the core metal. The ring body is moved onto the insulating core provided at the front end of the metal core by an extrusion rod of a transfer device that operates in the axial direction of the metal, and the ring body is held down and held by an upper hammer of a welding device that operates simultaneously with the upper hammer. , both electrode knuckles are operated in a direction perpendicular to the axis of the core metal to bring them into contact with the ring body, and after welding the joint surfaces of both ends of the ring body by applying electricity to the two electrode knock heads, the ring body is moved upwardly. The ring body is transferred to a ball transfer surface forming device consisting of a die, a lower die, and a holding frame, and the upper die is pressed to form a hole transfer surface at one end of the inner peripheral surface of the ring body using a press method. The basic structure is to correct the roundness of the body.

Moreover, by adopting the above structure, it is possible to manufacture a ring-shaped outer ring piece having high roundness, excellent mechanical strength, and a smooth hole transfer surface with extremely high efficiency, and the manufacturing cost can be reduced. It is possible to significantly reduce the

Hereinafter, details will be explained based on an embodiment of the present invention shown in FIGS. 5 to 9. Note that the same reference numerals are used for parts common to FIGS. 1 to 4.

FIG. 5 is a manufacturing process diagram of an outer ring for a bearing according to the present invention, FIG. 6 is a schematic front view of the ring manufacturing machine, FIG. 7 is a schematic side view thereof, and FIG. 8 is an explanatory diagram of its operation.

Referring to FIG. 5, reference numeral 6 denotes a drum around which a steel wire rod A having a circular cross section is wound, from which the wire rod A is fed out to a forming device 8 by a feeding device 7. The forming device 8 is provided with two sets of rolls and forming ties, and the wire rod A having a circular cross section is
is formed into a wire B having a rectangular cross section. Note that, of course, if a wire rod with a rectangular cross section of predetermined dimensions is used from the beginning, the forming device 8 may be omitted.

The wire B that has exited the forming device 8 is fed to the link manufacturing device C in predetermined dimensions by the fixed size feed device 9, and is cut into a ring body by the ring forming device 18 of the ring making device C. The molding is done at the same time. The ring body 13 formed by the ring molding device 18 is manufactured by ring molding fi
The welding device 19 integrated with f18 welds the joint surfaces 17 at both ends thereof, and then the welding surface 17 is sent to the welding inspection device 20.

The ring body 20 that has passed through the inspection device 20 is sent by an automatic feeder to a hole rolling surface forming device 21, where a press forming operation is performed to correct the roundness and form ball transfer m12.

As shown in FIGS. 6 and 7, the ring manufacturing device C includes a ring forming device 18, a welding device 19, and a transfer device for moving the ring body 13 formed by the ring forming device 18 to the welding device 19. 22, a cutting device 23 for the wire B, and a drive mechanism (not shown) for each of the devices. Further, the ring forming device 18 has an upper push head 18.
The welding device 19 is composed of an upper push head 19 a, a lower push head 18 b, two side push heads 18 c, and a core metal 24, and an upper push head 19 a, two electrodes 19 b, and an insulated welding device 19. Core body 24
It is composed of a.

The wire B fed out to the left by a predetermined distance along the upper surface of the cylindrical core bar 24 projected forward from the fixed size feeding device 9 is integrated with the upper push head 18a of the ring forming device 18. The cut is made between the movable blade 23a and the fixed blade 23b, which move up and down ((1) in FIG. 8), and then both ends are pushed downward along the core metal 24 by the upper push head 18a. ((2) in FIG. 8), both ends of the side push head 18c are bent along the core bar 24 ((3) in FIG. 8), and finally the lower push head 18b is bent. 8 (4)) to form a complete ring body 13.

The formed ring body 13 is then pushed out to the left by the transfer device 22 operating in the direction of the arrow in FIG.
a (5 in Fig. 8). Through the following operations, cutting of the wire B, forming it into a ring shape, and transferring it to the welding position are completed, and then the ring forming device 18 is moved to the eighth
Returning to the state shown in (1) in the figure, cutting of the wire B is started.

On the other hand, when the ring I*13 is transferred from the ring forming device 18 onto the insulating core 24a of the welding device 19, a welding device that operates synchronously with the upper push head 18a of the forming device 18 from above. The upper push head 19a descends ((6) in FIG. 8) and presses it onto the insulating core 24a ((7) in FIG. 8). Thereafter, the electrodes 19b, 19b are extruded synchronously with the measuring head 18c of the molding device 18 ((8) in Fig. 8), and the ring body 13 is Both end joint surfaces 17 are resistance welded ((9) in FIG. 8). Moreover, after the welding is completed, the ring body 1 sent forward by the transfer device 22 is
3, that is, it is pushed forward by the next ring body 13 formed during welding of the previous ring body 13 (00 in FIG.
), conveyor (not shown) welding inspection device 20
sent to. Note that the ring forming device 18 and the welding device 1
Each push head of 9 and the push rod 22a of the transfer device 22 are as follows:
Both are grooved so that they operate at a fixed timing via a cam mechanism (not shown), and the
Seventy ring bodies 13 are manufactured.

The ring body 13 whose welded part has been checked for integrity by the welding inspection device 20 is then transferred to the ball rolling surface forming device 21 as shown in FIG. 9, where the roundness is corrected and the ball rolling surface 2 is Formation takes place.

The ball transfer surface forming device 21 is formed into a press-type groove by an upper mold 21 a, a lower mold 21 b, and a holding frame 21 c, and the lower mold 21 b is supported via a spring 25. The ring body 13 transferred from the welding inspection device 20 is placed on the lower mold 21 b, and then
By pressing 'a, the upper mold 21 a and the lower mold 21
b and the holding frame 21c, and the upper end of the inner circumferential surface is crushed into a substantially flat shape to form the ball transfer surface 2. Moreover, by pressing the upper die 21a, the ring body 13 is shaped into an extremely accurate right circle along each die 21a, 21b, and 21c.

In the present invention, the ring body 13 formed as described above is attached to the core metal 2.
Since the ring body 13 is moved to the welding position using the core metal 24 as a guide without removing it from the ring body 4, there is no possibility that a large gap or step will be formed at the joints at both ends of the ring body 13. Furthermore, since the ring body 13 is welded while being pressed onto the circular insulating core body 24a by the upper push head 19a and the electrode push head 19b, it is possible to completely weld the joints at both ends. The ring body does not sometimes become distorted.

Furthermore, since the molding of the ring body 13 and the welding of the previously molded ring body are performed at the same time, the manufacturing efficiency of the ring body is greatly increased.

Furthermore, in the present invention, the ball transfer surface 2 of the ring body 13 is formed by pressing rather than turning, which greatly improves work efficiency and also corrects the roundness of the ring body 13 itself. According to the present invention, compared to the conventional manufacturing method of this type of ring-shaped split outer ring, the production capacity is approximately 3. The production cost is doubled (approximately 50 to 80 pieces per minute) and the manufacturing cost is also significantly reduced. Furthermore, the strength of the welded part, the smoothness and roundness of the ball transfer surface are significantly improved, and the bearing accuracy after assembly is improved, which has excellent practical effects.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a ring-shaped halved outer ring, and FIG. 2 is a sectional view of a press bearing using the ring-shaped halved outer ring. FIG. 3 is a schematic plan view of a conventional ring forming device,
FIG. 4 is a schematic front view thereof. . FIG. 5 is a manufacturing process diagram of a ring-shaped halved outer ring according to the present invention, FIG. 6 is a schematic front view of the main part of the ring manufacturing apparatus C, and FIG. 7 is a schematic side view of the main part. FIG. 8 is an explanation of the operation of the ring manufacturing apparatus C.
) to 8 (5) illustrate the operation of the ring forming device, and 8.
Figures (6) to 8 (00) show the operation of the welding device. FIG. 9 is a sectional view of the main part of the ball rolling motion forming device,
The left half shows before operation, and the right half shows after operation. A Round steel wire B Square steel wire C Ring manufacturing device 1 Ring-shaped outer ring piece 2 Ball rolling mechanism 8 Forming device 9, sizing feeding device 17 Both end joint surfaces 18 Ring forming device 18 a Upper push head 18 b lower push head 1.8 c Side push head 19 Welding device 19 a Upper push head 19 b Electrode push head 20 Welding inspection device 21 Pole transfer surface forming device 22 Transfer device 23 Cutting device 24 Core metal patent applicant Special Bearing Manufacturing Co., Ltd. No. 1 Figure 2 Figure 4 Figure 3 6 7 Figure 5 Figure 8 Figure 8 (7) Figure 8 (2) Figure 8 (8) Figure 8 (3)

Claims (1)

[Claims] A steel wire rod (A) with a circular cross section is made into a steel wire rod (B) with a rectangular cross section using a forming device (8), and then the steel wire rod (B) is shaped into rings at regular size intervals by a sizing feeding device (9). The steel wire (
B) is placed on the upper kettle head (1) of the ring molding device (18).
8a) and a cutting device (the movable blade (23a) in the figure are simultaneously operated downward to cut the steel wire (B) and curve it in a semicircular shape along the core metal (24); Subsequently, the side drumheads (18b) and (1) of the ring molding device α8) are
8b) and the lower drum head (18c) are operated in a direction perpendicular to the axis of the core metal (24) to form a ring body a■, and then the ring body α■ is operated in the direction of the axis of the core metal (24). The core bar (24) is moved by the extrusion rod ('22a) of the transfer device (22).
The ring body (13 is moved onto the insulating core (24a) provided at the front end of the core (24a), and the ring body (13) is moved onto the insulating core (24a) provided at the front end of the
4a) and press both electrode heads (191))
(19b) in a direction perpendicular to the axis of the core body (24a) to bring it into contact with the ring body α3), and
) (191)) The ring body α3
) are welded to both end joint surfaces (17), and then the ring body α
a is the upper die (21a), the lower q (21b) and the holding frame (2
1c) is transferred to a hole rolling surface forming device consisting of
The upper mold (21a) is pressed to form a ball transfer surface (2) at one end of the inner circumference of the ring body 0■ by a press working method, and the roundness of the ring body (1■) is A method for manufacturing a ring-shaped two-knurled outer ring of a bearing that is adapted to be corrected.