JP3435110B2 - Cold forming equipment for metal rings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cold rolling (CRF) a metal ring-shaped component such as an inner ring, an outer ring of a ball bearing or various sleeves.
In particular, the present invention relates to a cold forming apparatus for forming a product having an inner peripheral surface that is not parallel to a rotation axis, such as an outer ring of a tapered roll bearing.

[0002]

2. Description of the Related Art As a means for manufacturing a ring-shaped component made of metal, particularly steel, represented by inner and outer rings of a ball bearing, FIG.
The ring-shaped work 2 which is a ring-shaped material ring obtained by cutting the material tube into slices as shown in FIG.
There is used an apparatus for cold rolling and expanding by sandwiching it between a forming roll 15 for forming an outer surface, which is disposed on the outside, and a mandrel 19 for forming an inner surface, which is passed through the ring-shaped work 2. The mandrel 19 is generally supported by a mandrel receiving roll 30. Various improvements have been made to this type of device in order to improve the dimensional accuracy of products or improve the productivity. For example, Japanese Examination 4
-738 is an NC for preventing slippage between the mandrel receiving roll 30 and the mandrel 19 for preventing bending of the mandrel, and for preventing defective roundness due to deviation of elongation of inner and outer surfaces of the product due to slip. A control means is described and it has been proposed to use a servomotor as its drive source.

Generally, in a commercially available apparatus, the gap between the forming roll and the mandrel is set according to the rolling amount of the ring supporting roll or the ring during forming during rolling in order to prevent runout of the ring during forming during rolling. Various moving means for adjusting are adopted. For example, the mandrel receiving roll was fed with jack screws. Or it was due to pressure fluctuations in the hydraulic cylinder. However, conventional devices have not always been satisfactory to meet the recent demanding demands of users on dimensional accuracy and cost of products.

Therefore, in order to meet these demands, the applicant applies the forming roll 15, the mandrel 19 and the mandrel receiving roll 30, and the mandrel moving guide device and the mandrel receiving roll moving guide device to the upper and lower wall surfaces respectively. 9, 10 and front and rear wall bodies 11,
Japanese Patent Application No. 10-194539 discloses a cold forming apparatus for a metal ring, which is attached to a restraining frame body 13 composed of 12 in a restrained state through a linear motion block 8 or the like to improve dimensional accuracy.

However, in the cold forming apparatus described above, the ring-shaped work 4 having the inner peripheral surface 4 which is not parallel to the rotation axis, such as the outer ring 3 of the tapered roll bearing, is provided.
In the case of molding No. 7, as shown schematically in FIG. 7, the ring-shaped work 47 to be rotationally molded largely shakes left and right in the direction of the arrow 50. Therefore, the left and right work side surfaces 5 of the ring-shaped work 47 come into contact with the inner side surface 32 of the mandrel receiving roll 30. This contact causes seizure due to friction between the inner side surface 32 of the mandrel receiving roll 30 and the left and right work side surfaces 5 of the ring-shaped work 47, which hinders rotation and prevents smooth molding.

Further, in the conventional cold forming apparatus composed of the forming roll 15, the mandrel 19, and the mandrel receiving roll 30, as shown schematically in FIG. 8, the outer diameter 56 of the largest product 55 that can be formed is a dotted line. It is indicated by a circle, and its size is determined by the outer diameter of the mandrel 19, the outer diameter 33 of the mandrel receiving roll 30, and the shaft diameter 34 of the mandrel receiving roll 30. Therefore, it was necessary to design the machine size, that is, the outer diameter 33 and the shaft diameter 34 of the mandrel receiving roll 30 by the maximum outer diameter 56 of the product 55.

Further, depending on the state of the side surface of the ring-shaped work 47, or the parallel chuck (not shown) for supplying the ring-shaped work 47 from above the molding apparatus 1 to the molding position of the ring-shaped work 47 is worn and the molding position. Due to the unstable supply to the mandrel, the molding may be started without the mandrel shaft 20 being normally mounted on the mandrel bearing holder support frame 23. In such a situation, the molded product 55 comes off the mandrel 19, and when the product 55 flows to the next step, the product 55 collapses and becomes clogged around the product 55, and the ring-shaped workpiece 47 to be supplied next and the clogged product 55. There is a problem that the mandrels 19 interfere with each other, and the problem is repeated.

[0008]

The problem to be solved by the present invention is to provide a ring-shaped work 2 having an inner peripheral surface 4 which is not parallel to the rotation axis, such as an outer ring 3 of a tapered roll bearing, by a cold forming apparatus. A ring shape having an inner peripheral surface 4 that is non-parallel to the rotation axis, by eliminating seizure due to friction between the work side surface 5 and the inner side surface 32 of the mandrel receiving roll 30 due to the lateral deflection of the ring-shaped work 2 that occurs when molding The product 55 can be manufactured smoothly, and the size of the machine, that is, the mandrel receiving roll outer diameter 30 and the mandrel receiving roll shaft diameter 34 is changed according to the difference in the outer diameter 56 of the ring-shaped product 55. Therefore, the size of the machine can be made constant regardless of the outer diameter of the product 55, and the ring-shaped work 2 can be normally formed at the mandrel position. And the mandrel 19 is supplied to the location is to provide a cold forming device which solves the clogging of product so as to be properly inserted into and supported on the mandrel shaft receiving the support frame 23.

[0009]

According to the invention of claim 1, the forming roll 15,
The mandrel 19 and the mandrel receiving roll 30 are made parallel to each other and arranged in a straight line in this order.
AC for feeding the mandrel 19 from the side into the ring-shaped work 2 set at the processing position between the No. 5 and the mandrel 19.
In a metal ring cold forming apparatus having a mandrel feed mechanism 60 driven by a servo motor 61, left and right free rolls 35 are disposed laterally of the ring-shaped work 2 and between the mandrel 19 and the mandrel receiving roll 30.
The cold-rolling device for a metal ring is characterized in that a freely rotating thrust plate 40 is provided on a side surface of a free roll 35 facing a side surface of the ring-shaped work 2. In the above device, the free roll 35 of the thrust plate 40
The shaft support to the inner diameter surface of is rotatable by, for example, a bearing.

In the invention of claim 2, the free roll 35
Is abutting against the mandrel receiving roll 30 and the mandrel 19, thereby transmitting the rotational force and the pressing force of the mandrel receiving roll 30 to the mandrel 19, wherein the apparatus for cold forming a metal ring according to claim 1, is there.

In the third aspect of the invention, the free roll 35 is used.
Is a cantilevered support by a free roll support frame 38, and is a cold forming apparatus for a metal ring according to the means of claim 1 or 2.

In the invention of claim 4, the mandrel feed mechanism 60 is arranged below the mandrel 19 and is driven by a linear guide rail 25 parallel to the mandrel axis, and an AC servomotor 61 drives the linear guide rail 25. A mandrel shaft support frame 22 that is moved and moved and cantileverly supports one end of the mandrel shaft 20, and a mandrel bearing receiving support frame 23 that moves on the linear guide rail 25 and receives and supports the other end of the mandrel shaft 20. , Which is arranged behind the mandrel bearing housing support frame 23 and which is located behind the mandrel bearing housing support frame 2.
4. A means according to any one of claims 1 to 3, which comprises a stopper 27 for stopping the movement of No. 3 and an air cylinder 28 with a built-in proximity switch that operates by sensing the approach of the mandrel bearing housing 23. Is a cold forming apparatus for a metal ring in.

The operation of the cold forming apparatus according to the present invention will be described. The free roll 35 is provided between the mandrel 19 and the mandrel receiving roll 30, and the free roll 35
Thrust plate 40 rotatably via bearings
Since the ring-shaped work 2 having the inner peripheral surface 4 that is not parallel to the rotation axis is provided, the inclined working surface 2 of the mandrel 19 is provided.
1, the ring-shaped work 2 is deflected to the side of the arrow 50 due to the axial force from the mandrel 19, and the thrust plate 40 facing the side surface 5 of the ring-shaped work 2 is ring-shaped. Even if the side surface 5 of the workpiece 2 contacts
Since the thrust plate 40 also rotates synchronously in the same direction as the contact portion of the ring-shaped workpiece 2 rotates, it does not burn due to friction as in a device without a thrust plate.

Further, in the conventional cold forming apparatus comprising the forming roll 15, the mandrel 19, and the mandrel receiving roll 30, it is necessary to change the outer diameter of the mandrel receiving roll and the shaft diameter of the mandrel receiving roll according to the outer diameter of the product 55. There was a freeroll 35 and mandrel 19 as above
Since it was interposed between the mandrel receiving roll 30 and
Since the depth to the mandrel receiving roll shaft 31 at the forming position of the ring-shaped work 2 can be widened, the forming device can be made to have a constant size regardless of the outer diameter of the product 55.

The linear guide rail 25 for guiding the mandrel shaft support device for supporting one end of the mandrel shaft 20 is extended, and the mandrel bearing receiving support frame 22 for receiving and supporting the other end of the mandrel shaft 20 is extended and extended. The linearly moving block 26, which is movable on the moving guide rail 25, is used as a guide so that a conventionally fixed one can be moved. Further, the mandrel bearing housing support frame 23 is supported from behind by an air cylinder 28, a proximity switch 29 is built in the air cylinder 28, and a stopper 27 is provided behind the mandrel bearing housing support frame 23. Therefore,
The mandrel 19 moves forward and approaches the mandrel bearing holder support frame 23, and the other end of the mandrel shaft 20 is received by the mandrel bearing holder support frame 23. The stopper 27 on the back is stopped and the proximity switch 29 provided on the air cylinder 28 is turned on to start molding. When the molding is completed, the mandrel 19 is retracted, but the air cylinder 28 is actuated accordingly, and the mandrel bearing holder support frame 23 is moved.
Can be advanced to the side of the mandrel 19 by 2 to 3 mm, and it is determined that the proximity switch 29 is turned off by the advance and the mandrel 19 is normally retracted.

Therefore, this mechanism has a mandrel breakage,
Sticking of the ring-shaped work 2 to the mandrel shaft 20 due to the state of the side surface 5 of the ring-shaped work 2 or instability of the supply due to the wear of the parallel chuck that supplies the ring-shaped work 2 to the forming position, or starting the forming with the sticking The molded product 55 is disengaged from the mandrel 19 due to the above, or the peripheral part is clogged due to the product 55 falling down when flowing to the next process, and the clogged product 55 and the ring-shaped work 2 and the mandrel 19 to be supplied next. The safety device can detect an abnormality of the device due to interference or the like.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a metal ring cold forming apparatus 1 of the present invention. FIG. 2 is a plan view of the cold forming apparatus 1. FIG. 3 is a view showing the free roll and its supporting frame, (a) is a side view, and (b) is a cut front. FIG. 4 is a schematic diagram showing a mandrel feed mechanism 60 that cantilevers the mandrel 19 and moves in the axial direction. FIG. 5 is a plan view schematically showing the positional relationship among the forming roll, mandrel, mandrel receiving roll, free roll and ring-shaped work of the forming apparatus of the present invention, and FIG. 6 is a side view of FIG. FIG. 7 shows a molding roll, mandrel, and
FIG. 8 is a cutting plan view schematically showing the positional relationship between the mandrel receiving roll and the ring-shaped work, and FIG. 8 is a side view of FIG. 7.

As shown in FIGS. 1 and 2, the forming roll 15, the mandrel 19 and the mandrel receiving roll 30 of the present invention are arranged in a straight line in the order of shaft 16, shaft 20 and shaft 31 in front and back. Then, the upper linear motion guide rails 6 and the lower linear motion guide rails 7 fixed to the rigid constraining frame body 13 including the upper wall surface body 9, the lower wall surface body, the front wall surface body 11, and the rear wall surface body 12 are directly connected to the respective linear motion guide rails 6. It is attached by a moving block 6. An AC servo motor 61 is installed beside the mandrel 19 and moves the mandrel 19 in the direction of the mandrel axis 20. The mandrel 19 is cantilevered by a mandrel support frame 22 that is fixed to a linear motion block 26 that moves on the guide rail 25. Similarly, the mandrel bearing insert provided on the linear motion block 26 that also moves the guide rail 25. The shaft 20 on the opposite side of the mandrel 19 is received and supported by the support frame 23. In FIG. 2, AC
The servomotor 61 is on the right side of the mandrel 19, but in FIG. 4, it is a schematic view as seen from the front wall surface body 11 side.
It is installed on the right side of 9. Accordingly, the mandrel bearing holder support frame 23 is also arranged on the right side. The mandrel feed mechanism 60 having these mechanisms is used for the mandrel 19
Has a mandrel support frame 22 that cantileverly supports and a mandrel bearing receiving support frame 23 that receives and supports the mandrel shaft 20.

Further, in the metal ring cold forming apparatus of the present invention, the left and right free rolls 35 are interposed between the mandrel 19 and the mandrel receiving roll 30 on both the left and right sides of the ring-shaped work 2 set at the processing position. It arranges. These free rolls 35 transmit the pressing force and rotational force of the mandrel receiving roll 35 to the mandrel 19. A thrust plate 40 is provided on the side surface of each free roll 35 facing the side surface of the ring-shaped work 2 by a shaft 36 so as to freely rotate by interposing a bearing 37 for each free roll 35. As shown in (a) of FIG. 3, these free rolls 35 are the upper linear guide rails 6 provided on the upper wall surface body 9 of the restraint frame body 13 of the main body device.
And a free-roll support frame 38 attached to a linear motion block 8 that can move by being fitted to the lower linear motion guides 7 provided on the lower wall body 10, and cantilevered by a shaft 36.

The mandrel feed mechanism 60, as shown in FIG. 4, is a linear guide rail 25 provided on the left and right sides of the main unit.
And a linear motion block 26 fitted and mounted on the linear motion block 26, and a mandrel support frame 22 integrally erected on the linear motion block 26.
And a mandrel 19 that is cantilevered on the mandrel support frame 22, and a drive shaft for moving the mandrel support frame 22 along the linear guide rail 25 to the machining surface 21 of the mandrel 19 to the machining fixed position. An AC servomotor 61 having 62 and an insertion hole 2 for receiving to support the mandrel shaft 20 at the tip of the moving mandrel 19.
4, the mandrel bearing receiving support frame 23 and the mandrel support frame 23 are erected integrally to form a linear guide rail 25.
And a stopper 27 for stopping the movement of the mandrel bearing housing support frame 23 behind the mandrel bearing housing support frame 23. An air cylinder 28 having a built-in proximity switch 29 that senses an approach and operates is provided behind the mandrel bearing holder support frame 23. The air cylinder 28 is fixed by means not shown.

FIG. 5 shows the forming roll 15, the mandrel 19 and the mandrel receiving roll 30 in the forming apparatus of the present invention.
And mandrel 19 and mandrel receiving roll 30
Free roll 3 which is a feature of the present invention interposed between
5 is a plan view schematically showing the positional relationship between the ring-shaped workpiece 2 and the thrust plate 40 provided on the side surface of the free roll 35. FIG. FIG. 6 is a schematic diagram showing a side view of FIG. Thrust plate 40 is free roll 3
Floating from the side of 5 to the outside, free roll 35
Bearing 3 on shaft 36 so that it can rotate freely with respect to
It is pivoted at 7.

In the cold forming apparatus 1 having the above-mentioned structure of the present invention, the AC servomotor 61 moves the mandrel shaft support frame 22 in the mandrel retracting direction 42 to retract the mandrel 19 as shown in FIG. Open the machining position,
A chuck (not shown) is provided for the ring-shaped work 2 which is separately fed above the cold forming apparatus 1 to this processing position.
After gripping and setting with, the mandrel 19 is moved again in the mandrel entry direction 41 by the AC servomotor 61, and the mandrel 19 is inserted into the ring-shaped work 2,
Further moving, the mandrel shaft 20 is inserted into the insertion hole 24 of the mandrel bearing holder support frame 23 and supported. At this time,
The mandrel bearing housing support frame 23 is pushed and moved while supporting the mandrel shaft 20, and compresses the cylinder rod 39 of the air cylinder 28, while the linear motion block 26 to which the mandrel bearing housing support frame 23 is attached serves as a stopper 27. The contact is stopped and the movement is stopped, and at the same time, the proximity switch 29 built in the air cylinder 28 detects it, and cold forming is started. On the other hand, the AC servomotor 14 is driven in synchronism with this, and the rotation is belt-transmitted from the pulley 43 to the pulley 44, and the mandrel receiving roll 30 is moved forward by the linear motion block 8 by screw driving to apply an appropriate amount. Pressure is constantly applied to the free roll 35 to back up the mandrel 19 via the free roll 35. Further, the flywheel 45 of the forming roll 10 is driven and rotated by a motor (not shown) separately to start the cold forming process. By the way, when processing a product having an axially asymmetric inner peripheral surface 4 such as an outer ring of a tapered bearing, the mandrel 19 is attached to the ring-shaped work 2 during the forming process.
A force acts laterally from the machining surface 21 inclined to the axis of the mandrel receiving roll 30, and the side surface of the ring-shaped work 2 comes into contact with the thrust plate 40 on the side surface of the free roll 35 to rotate. Since it can freely rotate with the free roll 35, it rotates with the rotational movement of the side surface of the ring-shaped work 2, so that the ring-shaped work 2 and the thrust plate 40 are formed without friction between them so as to prevent friction between them. You can When the molding is completed for a predetermined time in this way and the processing is completed, the rotation of the flywheel 45 is stopped by stopping the motor, the forming roll 15 is stopped, and the cold working is completed. Next, the mandrel 19 is retreated in the retreat direction 42 by the AC servomotor 61, and at the same time, the mandrel bearing receiving support frame 23 is pushed by the air cylinder 28 by 2 to 3 mm to move. By this movement, the proximity switch 29 is no longer detected, and it is determined that the mandrel 19 has normally retracted and the product has been taken out. Therefore, in the present invention, this detection mechanism can be used as a safety device for detecting mandrel breakage and work clogging.

Further, in the apparatus of the present invention, by further providing the free roll 35, a large space can be formed on the mandrel receiving roll side, so that a ring having a larger product outer diameter can be processed.

[0024]

As described above, the cold forming apparatus for a metal ring of the present invention is a cold forming apparatus comprising a forming roll, a mandrel and a mandrel receiving roll.
Since a free roll is provided between the mandrel and the mandrel receiving roll, it is necessary to change the machine size, that is, the mandrel receiving roll outer diameter and the mandrel receiving roll shaft diameter, depending on the difference in the outer diameter of the ring-shaped product. The size of the machine can be made constant regardless of the outer diameter of the product, and the mandrel can be moved by a supporting frame that supports the mandrel in a cantilever manner. You can move the frame as well,
Efficient by providing a switch that detects the movement of the mandrel bearing holder support frame to detect that the ring-shaped workpiece is correctly set at the machining position, that the mandrel is not broken and that the workpiece is not clogged. A ring that is formed when forming a ring-shaped work that has an inner peripheral surface that is not parallel to the rotation axis, such as the outer ring of a tapered roll bearing, by providing a freely rotating thrust plate on the free roll. It is possible to produce a ring-shaped product smoothly and stably by eliminating the frictional seizure on the side surface of the work due to the left-right deflection of the work-like work.

[Brief description of drawings]

FIG. 1 is a side view of a metal ring cold forming apparatus of the present invention.

FIG. 2 is a plan view of a metal ring cold forming apparatus of the present invention.

FIG. 3 is a view showing a free roll and its supporting frame in the means of the present invention, in which (a) is a side view and (b) is a cut front surface.

FIG. 4 is a schematic view showing a mandrel feeding mechanism that cantilevers the mandrel and moves in the axial direction in the means of the present invention.

FIG. 5 is a cut plan view schematically showing the positional relationship among a forming roll, a mandrel, a mandrel receiving roll, a free roll and a ring-shaped work in the means of the present invention.

FIG. 6 is a view schematically showing the side view of FIG. 5 of the present invention.

FIG. 7 is a cut plan view schematically showing an arrangement relationship of a forming roll, a mandrel, a mandrel receiving roll, and a ring-shaped work of a conventional forming apparatus.

FIG. 8 is a view schematically showing a side view of the above-mentioned FIG. 7 of the related art.

[Explanation of symbols]

1 Metal Ring Cold Forming Equipment 2 Ring-shaped Work 3 Outer Ring 4 Inner Surface 5 Work Side Side 6 Upper Linear Motion Guide Rail 7 Lower Linear Motion Guide Rail 8 Linear Motion Block 9 Upper Wall Body 10 Lower Wall Body 11 Front Wall Body 12 Rear Wall surface body 13 Restraint frame body 14 Motor 15 Forming roll 16 Shaft 17 Machining surface 19 Mandrel 20 Shaft 21 Machining surface 22 Mandrel support frame 23 Mandrel bearing receiving support frame 24 Insertion hole 25 Linear motion guide rail 26 Linear motion block 27 Stopper 28 Air cylinder 29 Proximity switch 30 Mandrel receiving roll 31 Shaft 32 Inner surface 33 Outer diameter 34 Shaft diameter 35 Free roll 36 Shaft 37 Bearing 38 Free roll support frame 39 Cylinder rod 39 Cylinder rod 40 Thrust plate 41 Mandrel forward direction 42 Mandrel backward direction 43 Pulley 4 Pulley 45 flywheel 47 ring-shaped workpiece 50 arrow 55 Product 56 outer diameter 60 mandrel feeding mechanism 61 AC servo motor 62 drives shaft

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 2001-121233 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B21H 1/00

Claims (4)

(57) [Claims] 1. A mandrel within a ring-shaped work 2 set at a processing position between the forming roll 15 and the mandrel 19 in which the forming roll 15, the mandrel 19 and the mandrel receiving roll 30 are parallel to each other and arranged in a straight line in this order. In a metal ring cold forming apparatus having a mandrel feed mechanism 60 driven by an AC servo motor 61 for sending 19 from the side, a left and right free space is provided between the mandrel 19 and the mandrel receiving roll 30 on the side of the ring-shaped work 2. A cold forming apparatus for a metal ring, characterized in that a roll 35 is interposed and a freely rotating thrust plate 40 is provided on the side surface of the free roll 35 facing the side surface of the ring-shaped work 2. 2. The free roll 35 abuts on the mandrel receiving roll 30 and the mandrel 19,
The cold forming apparatus for a metal ring according to claim 1, wherein the rotational force and the pressing force of the mandrel receiving roll 30 are transmitted to the mandrel 19. 3. The cold-rolling apparatus for a metal ring according to claim 1, wherein the free roll 35 is cantilevered by a free roll support frame 38. 4. The mandrel feed mechanism 60 is arranged below the mandrel 19 and is parallel to the mandrel axis, and is driven by an AC servo motor 61 to move on the linear guide rail 25. A mandrel shaft support frame 22 that cantilevers one end of the mandrel shaft, and a mandrel bearing receiving support frame 23 that moves on the linear guide rail 25 and receives and supports the other end of the mandrel shaft.
A stopper 27 disposed behind the mandrel bearing housing support frame 23 for stopping the movement of the mandrel bearing housing support frame 23 and an air cylinder 28 having a built-in proximity switch that operates by sensing the approach of the mandrel bearing housing support frame 23.
The cold forming apparatus for a metal ring according to any one of claims 1 to 3, comprising: