JP2001170731A - Cold forming apparatus for metal ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold forming apparatus capable of eliminating friction seizure of a work side face due to left/right oscillation, fixing a machine size regardless of a product outer diameter and eliminating clogging of a product when forming an annular work having the inner peripheral face not parallel to a rotation axis. SOLUTION: Relating to a cold forming apparatus, that a forming roll 15, a mandrel 19 and a mandrel receiving roll 30 are linearly arranged parallel in respective axes and in these sequence, a mandrel 19 is fed out into an annular work 2 set at a working position between the forming roll 15 and the mandrel 19 from a side by a mandrel feed mechanism 60 of an AC servo motor 61 drive, a free roll 35 is interposed between the mandrel 19 and the mandrel receiving roll 30, a thrust plate 40 freely rotating is arranged on the side face of the free roll 35 facing the side face of the annular work 2.

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 part such as an inner ring and 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 rotating shaft, 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 part made of metal, particularly steel, which is representative of the inner and outer rings of a ball bearing, FIG.
A ring-shaped work 2 which is a ring-shaped material ring obtained by cutting the material pipe in a circle as shown in FIG.
An apparatus for cold-rolling and enlarging the sheet by sandwiching it between a forming roll 15 for outside forming and a mandrel 19 for forming the inside that is passed through the ring-shaped workpiece 2 is arranged outside. The mandrel 19 is generally supported by a mandrel receiving roll 30. Various devices have been devised for this type of device in order to improve the dimensional accuracy of the product or to improve the productivity. For example, Tokuho 4
No. 738 shows a mandrel receiving roll 30 for preventing bending of the mandrel, and an NC for preventing slip between the mandrel 19 and preventing poor roundness due to irregular expansion of the inner and outer surfaces of the product due to the slip. A control means is described and it has been proposed to use a servomotor as its drive source.

In general, in a commercially available apparatus, a gap between a forming roll and a mandrel is formed in accordance with a ring support roll for preventing run-out of a ring during forming during rolling and a rolling amount of the ring during forming during rolling. Various moving means for adjustment are employed. For example, the mandrel receiving roll was fed by jack screws. Or it was due to hydraulic cylinder pressure fluctuations. However, conventional devices have not always been satisfactory to meet the recent stringent demands of users on product dimensional accuracy and cost.

[0004] In order to meet these demands, the applicant has proposed a forming roll 15, a mandrel 19 and a mandrel receiving roll 30, and a mandrel moving guide device and a mandrel receiving roll moving guide device, respectively. 9, 10 and front and rear wall body 11,
Japanese Patent Application No. 10-194539 discloses a cold forming apparatus for forming a metal ring in which the dimensional accuracy is improved by attaching the metal ring to a restraining frame 13 made of a metal 12 through a linear motion block 8 or the like in a restrained state.

However, in the cold forming apparatus described above, the ring-shaped work 4 having the inner peripheral surface 4 that is not parallel to the rotating shaft, such as the outer ring 3 of a tapered roll bearing, is used.
In the case of molding 7, the ring-shaped workpiece 47 to be rotationally formed largely swings right and left in the direction of the arrow 50 as schematically shown in FIG. 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 makes smooth forming impossible.

In a conventional cold forming apparatus including a forming roll 15, a mandrel 19, and a mandrel receiving roll 30, as shown schematically in FIG. 8, the outer diameter 56 of the largest product 55 that can be formed is indicated by a dotted line. The 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, the size of the machine, that is, the outer diameter 33 and the shaft diameter 34 of the mandrel receiving roll 30 had to be designed according to 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 to the molding position of the ring-shaped work 47 from above the molding apparatus 1 due to wear, the molding position is reduced. When the supply to the mandrel becomes unstable, the molding may be started without the mandrel shaft 20 being normally mounted on the mandrel bearing support frame 23. In such a situation, the molded product 55 comes off the mandrel 19, and when flowing to the next process, the product 55 falls down and is clogged around the product 55, and the ring-shaped workpiece 47 to be supplied next and the product 55 clogged, and There have been problems such as the mandrel 19 interfering with each other and causing further problems.

[0008]

The problem to be solved by the present invention is that a ring-shaped work 2 having an inner peripheral surface 4 which is not parallel to a rotating shaft, such as an outer ring 3 of a tapered roll bearing, is formed by a cold forming apparatus. A ring-like shape having an inner peripheral surface 4 that is non-parallel to the rotation axis is eliminated by eliminating the seizure caused by friction between the work side surface 5 and the inner surface 32 of the mandrel receiving roll 30 due to right and left run-out of the ring-shaped work 2 that occurs when forming the workpiece. The product 55 can be manufactured smoothly, and the size of the machine, that is, the size of the mandrel receiving roll outer diameter 30 and the size of the mandrel receiving roll shaft diameter 34 are changed by the difference in the outer diameter 56 of the ring-shaped product 55. Therefore, the size of the machine can be kept constant irrespective of the outer diameter of the product 55, and the ring-shaped workpiece 2 can be formed normally 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 first aspect of the present invention, there is provided a method for solving the above-mentioned problems.
The mandrel 19 and the mandrel receiving roll 30 are arranged in a straight line in this order with the respective axes parallel to each other.
AC that sends the mandrel 19 from the side into the ring-shaped work 2 set at the processing position between the mandrel 5 and the mandrel 19
In a metal ring cold forming apparatus having a mandrel feeding mechanism 60 driven by a servomotor 61, left and right free rolls 35 are interposed and disposed laterally of the ring-shaped work 2 and between the mandrel 19 and the mandrel receiving roll 30.
A metal ring cold forming apparatus characterized in that a free-rotating thrust plate 40 is provided on a side surface of a free roll 35 facing a side surface of a ring-shaped work 2. In the above apparatus, the free roll 35 of the thrust plate 40 is used.
Is rotatably supported by, for example, a bearing.

According to the second aspect of the present invention, the free roll 35
2. The metal ring cold forming apparatus according to claim 1, wherein the rotational force and the pressing force of the mandrel receiving roll 30 are transmitted to the mandrel 19 by contacting the mandrel receiving roll 30 and the mandrel 19. is there.

According to the third aspect of the present invention, the free roll 35
3. The apparatus according to claim 1, wherein the metal ring is cantilevered by a free-roll support frame.

According to the fourth aspect of the present invention, the mandrel feed mechanism 60 is disposed below the mandrel 19 and is parallel to the mandrel axis, and is driven by the AC servomotor 61 on 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, a mandrel bearing support frame 23 that moves on the linear guide rail 25 and receives and supports the other end of the mandrel shaft 20; , The mandrel bearing housing support frame 2 disposed behind the mandrel bearing housing support frame 23.
4. A means according to claim 1, further comprising a stopper 27 for stopping the movement of said third mandrel 3, and an air cylinder 28 with a built-in proximity switch which operates upon sensing the approach of said mandrel bearing support frame 23. Is a device for cold forming a metal ring.

The operation of the cold forming apparatus according to the present invention will be described. A free roll 35 is provided between the mandrel 19 and the mandrel receiving roll 30, and the free roll 35
Thrust plate 40 rotatably through bearings
Is provided, the ring-shaped workpiece 2 having the inner peripheral surface 4 that is not parallel to the rotation axis is formed by cutting the inclined work surface 2 of the mandrel 19.
In forming the ring-shaped workpiece 1, an axial force acts on the mandrel 19 to cause the ring-shaped work 2 to sway to the side of the arrow 50, and the ring-shaped work 2 is formed on the thrust plate 40 facing the side surface 5 of the ring-shaped work 2. Even if the side surface 5 of the work 2 touches,
The thrust plate 40 also rotates in the same direction as the contact portion of the ring-shaped work 2 rotates, so that the thrust plate 40 does not seize due to friction unlike an apparatus without a thrust plate.

In the conventional cold forming apparatus including 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 diameter of the mandrel receiving roll shaft according to the outer diameter of the product 55. However, the free roll 35 was moved to the mandrel 19 as described above.
And between the mandrel receiving roll 30
Since the depth of the forming position of the ring-shaped work 2 to the mandrel receiving roll shaft 31 can be widened, the forming apparatus can have a fixed size regardless of the outer diameter of the product 55.

A linear guide rail 25 for guiding a mandrel shaft supporting device for supporting one end of the mandrel shaft 20 is extended, and a mandrel bearing receiving support frame 22 for receiving and supporting the other end of the mandrel shaft 20 is directly extended. It is guided by a linear motion block 26 that can move on a moving guide rail 25, and a conventionally fixed one can be moved. Further, the mandrel bearing 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 support frame 23. Therefore,
The mandrel 19 moves forward and approaches the mandrel bearing receiving support frame 23, and the other end of the mandrel shaft 20 is received by the mandrel bearing receiving support frame 23. When the mandrel 19 is slightly advanced, the mandrel bearing receiving support frame 23 is pushed and retreated. It is set so that it stops when it hits a stopper 27 behind it and a 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, and the air cylinder 28 is actuated accordingly, and the mandrel bearing support frame 23 is moved.
Can be advanced to the mandrel 19 side by 2 to 3 mm, and by the advance, the proximity switch 29 is turned off, and it is determined that the mandrel 19 has normally retreated.

[0016] Therefore, this mechanism may cause breakage of the mandrel,
The ring-shaped work 2 sticks to the mandrel shaft 20 due to the state of the side surface 5 of the ring-shaped work 2 or the supply instability due to the wear of the parallel chuck that supplies the ring-shaped work 2 to the molding position, or the molding is started while the ring-shaped work 2 remains stuck. Of the molded product 55 from the mandrel 19 due to the above, or the clogging in the periphery due to the falling of the product 55 at the time of flowing to the next step, or the clogging of the clogged product 55 with the ring-shaped workpiece 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]

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. 3A and 3B are views showing a free roll and a supporting frame thereof, wherein FIG. 3A is a side view and FIG. FIG. 4 is a schematic diagram showing a mandrel feed mechanism 60 that cantileverly supports the mandrel 19 and moves in the axial direction. FIG. 5 is a cut-away plan view schematically showing the arrangement relationship among a forming roll, a mandrel, a mandrel receiving roll, a free roll, and a ring-shaped work of the forming apparatus of the present invention, and FIG. 6 is a side view of FIG. FIG. 7 shows a forming roll and a mandrel of a conventional forming apparatus.
FIG. 8 is a cross-sectional plan view schematically showing the arrangement relationship between the mandrel receiving roll and the ring-shaped work, and FIG. 8 is a side view of FIG.

As shown in FIGS. 1 and 2, the forming roll 15, the mandrel 19 and the mandrel receiving roll 30 of the present invention have their respective shafts 16, 20 and 31 parallel to each other and are arranged in a straight line in this order. The upper linear guide rail 6 and the lower linear guide rail 7 fixed to a rigid restraining frame 13 composed of an upper wall body 9, a lower wall body, a front wall body 11, and a rear wall body 12 are respectively provided. The moving block 6 is attached. An AC servomotor 61 is provided beside the mandrel 19 and moves the mandrel 19 in the direction of the mandrel shaft 20. The mandrel 19 is supported in a cantilever manner on a mandrel support frame 22 fixed to a linear motion block 26 that can move on the guide rail 25, and a mandrel bearing holder 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
Although the servo motor 61 is on the right side of the mandrel 19, FIG. 4 is a schematic diagram viewed from the front wall 11 side.
9 is located on the right side. Accordingly, the mandrel bearing receiving support frame 23 is also arranged on the right side. The mandrel feeding mechanism 60 having these mechanisms is used for the mandrel 19.
And a mandrel bearing support frame 23 for receiving and supporting the mandrel shaft 20.

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

As shown in FIG. 4, the mandrel feed mechanism 60 includes linear motion guide rails 25 provided on the left and right sides of the main unit.
And a linear motion block 26 fitted and mounted thereon, and a mandrel support frame 22 erected integrally with the linear motion block 26.
A mandrel 19 that is supported by the mandrel support frame 22 in a cantilever manner, and a drive shaft for moving the work surface 21 of the mandrel 19 to the work fixed position along the linear guide rail 25 on the mandrel support frame 22. And an insertion hole 2 for receiving the mandrel shaft 20 at the tip of the moving mandrel 19 to support the mandrel shaft 20.
4 and a mandrel support frame 23 and a linear motion 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 operates by sensing approach is provided behind the support frame 23 for the mandrel bearing. The air cylinder 28 is fixed by means not shown.

FIG. 5 shows a forming roll 15, a mandrel 19, and a mandrel receiving roll 30 in the forming apparatus of the present invention.
And the mandrel 19 and the mandrel receiving roll 30
Free roll 3 which is a means of the feature of the present invention interposed in
FIG. 5 is a plan view schematically showing a positional relationship between a ring work 2 and a thrust plate 40 provided on a side surface of a free roll 35 in a cutaway view. FIG. 6 is a schematic diagram showing a side view of FIG. Thrust plate 40 is free roll 3
5 with the free roll 35 floating slightly out of the side.
Bearing 3 on shaft 36 so that it can rotate freely
It is supported at 7.

In the cold forming apparatus 1 having the above-described structure of the present invention, the mandrel shaft support frame 22 is moved by the AC servomotor 61 in the mandrel retreating direction 42 as shown in FIG. Open the machining position
A ring-shaped work 2 which has been separately fed to the processing position above the cold forming apparatus 1 by a chuck (not shown).
Then, the mandrel 19 is moved again in the mandrel approach direction 41 by the AC servomotor 61, and the mandrel 19 is inserted into the ring-shaped work 2,
By further moving, the mandrel shaft 20 is inserted and supported in the insertion hole 24 of the mandrel bearing receiving support frame 23. At this time,
The mandrel bearing 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 with the mandrel bearing support frame 23 is attached to the stopper 27. The movement is stopped by abutment, and at the same time, the proximity switch 29 incorporated in the air cylinder 28 detects and starts the cold working forming. On the other hand, the AC servomotor 14 is driven in synchronization with the timing, and the rotation thereof is transmitted to the pulley 43 from the pulley 43 to the belt, and the mandrel receiving roll 30 is moved forward by the linear motion block 8 by screw driving, and an appropriate load is applied. Pressure is always 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 separately driven and rotated by a motor (not shown) to start cold forming. 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 workpiece 2 during the forming process.
The side surface of the ring-shaped work 2 from the mandrel receiving roll 30 abuts the thrust plate 40 on the side surface of the free roll 35 and rotates. Can rotate freely with the free roll 35, so that 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 prevented from friction and formed without seizure between the two. Can be. In this manner, when the forming is completed for a predetermined time 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 retreating direction 42 by the AC servomotor 61, and at the same time, the mandrel bearing receiving support frame 23 is pushed and moved by the air cylinder 28 by 2 to 3 mm. Due to this movement, the detection of the proximity switch 29 is released, and it is determined that the mandrel 19 has normally retreated and the product has been taken out. Therefore, in the present invention, this detection mechanism can be used as a safety device for detecting breakage of the mandrel and detection of work clogging.

Further, in the apparatus of the present invention, by 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 according to 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 size of the machine, that is, the outer diameter of the mandrel receiving roll and the size of the shaft diameter of the mandrel receiving roll due to the difference in the outer diameter of the ring-shaped product. The size of the machine can be kept constant irrespective of the outer diameter of the product, and the mandrel can be moved with a support frame that supports the mandrel in a cantilever manner. Make the frame movable as well,
Equipped with a switch that detects the movement of the mandrel bearing support frame to provide a safety device that detects that the ring-shaped work is correctly set in the processing position, that the mandrel is not broken, and that the work is not clogged. A ring that is formed when forming a ring-shaped work with an inner peripheral surface that is not parallel to the rotating shaft such as the outer ring of a tapered roll bearing by providing a free roll with a thrust plate that freely rotates This provides an unprecedented superior effect, such as eliminating the frictional seizure on the side surface of the workpiece due to the lateral movement of the workpiece and enabling a ring-shaped product to be manufactured smoothly and stably.

[Brief description of the drawings]

FIG. 1 is a side view of an apparatus for cold-forming a metal ring according to the present invention.

FIG. 2 is a plan view of an apparatus for cold-forming a metal ring according to the present invention.

3A and 3B are views showing a free roll and a support frame thereof in the means of the present invention, wherein FIG. 3A is a side view and FIG.

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

FIG. 5 is a cut-away plan view schematically showing an arrangement 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 diagram schematically showing the side view of FIG. 5 of the present invention.

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

FIG. 8 is a diagram schematically showing a conventional side view of FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Metal ring cold forming apparatus 2 Ring-shaped work 3 Outer ring 4 Inner peripheral surface 5 Work side 6 Upper linear guide rail 7 Lower linear guide rail 8 Linear block 9 Upper wall body 10 Lower wall body 11 Front wall body 12 Rear Wall body 13 Restriction frame 14 Motor 15 Forming roll 16 Shaft 17 Work surface 19 Mandrel 20 Shaft 21 Work surface 22 Mandrel support frame 23 Mandrel bearing support frame 24 Insertion hole 25 Linear guide rail 26 Linear 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 retract direction 4 Pulley 44 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

Claims (4)

[Claims] 1. A forming roll 15, a mandrel 19 and a mandrel receiving roll 30 are arranged in a straight line in this order with their respective axes parallel to each other, and a mandrel is set in a ring-shaped workpiece 2 set at a processing position between the forming roll 15 and the mandrel 19. In a metal ring cold forming apparatus having a mandrel feeding mechanism 60 driven by an AC servomotor 61 for sending out 19 from the side, left and right free sides between the ring-shaped work 2 and the mandrel 19 and the mandrel receiving roll 30. A cold forming apparatus for a metal ring, wherein a roll 35 is interposed, and a thrust plate 40 that freely rotates is provided on a side surface of the free roll 35 facing a side surface of the ring-shaped workpiece 2. 2. The free roll 35 comes into contact with the mandrel receiving roll 30 and the mandrel 19,
The apparatus 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 metal ring cold forming apparatus according to claim 1, wherein the free roll is cantilevered by a free roll support frame. 4. A mandrel feeding mechanism 60 is disposed below the mandrel 19 and is parallel to the mandrel axis. The mandrel feed mechanism 60 is driven by an AC servomotor 61 on the linear guide rail 25 to move. A mandrel shaft support frame 22 that cantileverly supports one end of the mandrel shaft, a mandrel bearing 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 which is disposed behind the mandrel bearing housing 23 and stops the movement of the mandrel bearing housing 23, and an air cylinder 28 with a built-in proximity switch which operates upon sensing the approach of the mandrel bearing housing 23.
The metal ring cold forming apparatus according to any one of claims 1 to 3, comprising: