EP3110577B2 - Ring rolling device - Google Patents

Ring rolling device Download PDF

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Publication number
EP3110577B2
EP3110577B2 EP14706598.1A EP14706598A EP3110577B2 EP 3110577 B2 EP3110577 B2 EP 3110577B2 EP 14706598 A EP14706598 A EP 14706598A EP 3110577 B2 EP3110577 B2 EP 3110577B2
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EP
European Patent Office
Prior art keywords
mandrel
ring
rolling device
drum
revolver drum
Prior art date
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EP14706598.1A
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German (de)
French (fr)
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EP3110577B1 (en
EP3110577A1 (en
Inventor
Andreas MARITZ
Wolfgang Müller
Pascal Stemmelin
Thomas Christoffel
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Hatebur Umformmaschinen AG
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Hatebur Umformmaschinen AG
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Application filed by Hatebur Umformmaschinen AG filed Critical Hatebur Umformmaschinen AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
    • B21H1/12—Making articles shaped as bodies of revolution rings of restricted axial length rings for ball or roller bearings

Definitions

  • the present invention relates to a ring rolling device according to the preamble of independent claim 1.
  • a known variant for producing rings for example for ball bearings, consists in first forging a ring blank, which is then further processed by ring rolling.
  • the ring blank is mounted around a mandrel and then rolled between the mandrel and a forming roller.
  • the thickness of the ring blank is reduced and its circumference is increased at the same time, since no material is removed.
  • the roll gap between the mandrel and the forming roller must be continuously reduced, which can be done, for example, by moving the mandrel towards the forming roller or vice versa.
  • the forming roller is designed so that its radius increases continuously starting from a starting zone against the direction of rolling rotation.
  • the roll gap is continuously reduced with a constant distance between the mandrel, whereby the ring blank is rolled to a smaller thickness.
  • four mandrels are mounted on a turntable, so that by turning the turntable through 90 ° the next mandrel with the next ring blank previously arranged around it is rotated towards the forming roller into the rolling position. This turning takes place exactly when the starting zone of the forming roller faces the turntable, where the ring blank does not yet come into contact with the forming roller.
  • the ring blank is only rolled afterwards by rotating the forming roller while the turntable no longer rotates.
  • a disadvantage of this ring rolling device is that it requires a specially shaped forming roll.
  • the ring blank must be rolled during exactly one revolution of the forming roller and the next ring blank must be brought into the rolling position at exactly the right time by rotating the turntable in a coordinated manner.
  • a ring rolling device which comprises a roller as a pressing element and a turntable with a plurality of mandrels rotatably mounted therein, around which the ring blanks to be rolled are mounted.
  • the mandrels can be moved towards the pressing element and away from it again.
  • a decreasing roll gap is formed between the mandrel and the pressing element, in which the ring blank is rolled.
  • the mandrels each engage in a conical bore in a mandrel roller journal that is rotatably mounted in the turntable and are firmly connected to a second mandrel roller journal at the top.
  • the present invention is therefore based on the object of creating a ring rolling device of the type mentioned at the outset which enables ring blanks to be fed and rolled quickly and precisely.
  • a ring rolling device for expanding a ring blank comprises a pressing element, a rotatably mounted mandrel around which the ring blank can be mounted, and a rotatable revolver drum in which the mandrel is rotatably mounted.
  • the revolver drum is arranged relative to the pressing element in such a way that by rotating the revolving drum between the mandrel and the pressing element, a decreasing roll gap is formed in which the ring blank is rolled while the revolving drum is rotating.
  • the revolver drum for the rotatable mounting of the mandrel has at least two rotatably mounted support rollers which support the mandrel in the direction of the revolver drum rotation axis so that the mandrel is between the support rollers and the pressing element during rolling.
  • the ring rolling device has the advantage that both the feeding of the ring blank into the rolling position and the rolling of the ring blank take place by rotating the turret drum towards the pressing element. This turning first forms a roll gap and the ring blank is brought into contact with the press element and then the roll gap is reduced, whereby the ring blank is rolled between the mandrel and the press element, i.e. the wall thickness of the ring blank is reduced.
  • the at least two rotatably mounted support rollers enable the mandrel to be supported during rolling to absorb the rolling forces over a desired mandrel length and to rotate the mandrel about its mandrel axis of rotation during rolling. In this way, a high rolling precision can be achieved. In addition, the mandrel only needs to be placed on the support rollers, which can be done very quickly.
  • the axes of rotation of the mandrel and the support rollers as well as the turret drum axis of rotation and, if the pressing element is a drive roller, its axis of rotation are preferably parallel, but this is not absolutely necessary.
  • the turret drum preferably comprises two spaced apart, torsionally rigidly connected to one another, disk-like drum parts, in each of which a part of the mandrel is rotatably mounted, so that a central part of the mandrel is exposed between the two disk-like drum parts for mounting a ring blank. Due to the two disk-like drum parts connected rigidly to one another, the mandrel can be mounted in a stable and simultaneously rotatable manner on both sides of the central part mounting the ring blank.
  • the disk-like drum parts for the rotatable mounting of the mandrel each have at least two rotatably mounted support rollers that support the mandrel in the direction of the turret drum axis of rotation so that the mandrel is between the support rollers and the pressing element during rolling.
  • the at least two support rollers each enable the mandrel to be supported on both sides of the central part to absorb the rolling forces over a desired mandrel length and to rotate the mandrel about its mandrel axis of rotation during rolling.
  • Each support roller advantageously has a support flange for supporting the mandrel.
  • the mandrel then only rests on the support flanges, which enables easier placement.
  • the support flanges are preferably each arranged at one end of the support rollers and serve as lateral guides for the ring blank.
  • the ring blank can thus be stabilized during rolling without additional components.
  • the mandrel is rotatably mounted in at least one roller bearing in the revolver drum.
  • Rolling bearings also enable the mandrel to be well supported to absorb the rolling forces over a desired mandrel length and to rotate the mandrel about its mandrel axis of rotation during rolling.
  • Rolling bearings and support rollers can also be combined with one another.
  • the revolver drum preferably has a stop for positioning the mandrel in the longitudinal direction of the mandrel. This enables precise positioning of the mandrel and the ring blank arranged thereon for rolling and is particularly important when the mandrel and / or the pressing element has a profile that is to be transferred to the ring blank.
  • the ring rolling device advantageously has a mandrel adjusting device for adjusting the mandrel in the longitudinal direction of the mandrel.
  • a mandrel adjusting device for adjusting the mandrel in the longitudinal direction of the mandrel. This makes it possible to easily arrange or store this ring blank around the mandrel by withdrawing the mandrel, feeding a ring blank into a loading position and pushing the mandrel forward again and pushing the mandrel through the ring blank located in the loading position. Conversely, the completely rolled ring can be removed from the mandrel again by pulling back the mandrel with the same or a further mandrel adjusting device.
  • the ring rolling device preferably has a ring blank feed device with which ring blanks can be fed individually to a point at which the mandrel can be pushed through the fed ring blank, that is to say the above-mentioned loading position. Together with the mandrel adjustment device, this enables a ring blank to be stored or arranged around the mandrel in a simple manner.
  • a ring blank can be stored around a mandrel at a first station, a ring blank can be rolled at a second station and a ring blank can be removed from a mandrel at a third station.
  • the rolling throughput can be increased considerably, that is, more ring blanks can be rolled into rings in a shorter time.
  • ring rolling is possible in step with the production of ring blanks and the ring rolling device can, for example, be attached to a cold or hot forming machine.
  • the advantage can be used that the still warm ring blanks produced by the hot forming machine can be rolled directly with the ring rolling device. Additional heating of the ring blanks can thus be dispensed with for hot ring rolling.
  • the ring blanks can be heated beforehand before ring rolling, and ring rolling devices according to the invention can be used for both hot ring rolling and cold ring rolling.
  • the components of the rolling device such as mandrel, press element, drive roller, etc., can optionally be cooled.
  • the ring rolling device preferably has a drive device for driving the pressing element, so that the ring blank can be rotated during rolling by the movement of the pressing element.
  • This enables the ring blank to be rotated several times on the rotatably mounted mandrel with the aid of the pressing element during rolling, the ring blank being rolled to a smaller thickness with each rotation. In this way, a greater reduction in thickness and more even, more material-friendly rolling can be achieved.
  • Rotating the ring blank three to thirty times, in particular eight to twelve times, during rolling has proven to be particularly advantageous, depending on the size of the ring blank and the desired wall thickness reduction.
  • the pressing element is advantageously a rotatably mounted drive roller.
  • a drive roller can be driven continuously, for example by means of a motor, and in turn its rotational movement on the Transfer ring blank stored around the mandrel as soon as it comes into contact with the drive roller.
  • the rotating of the drive roller can take place continuously and at a constant speed; there is no need to reset the pressing element again after rolling.
  • the illustrated embodiment of a ring rolling device comprises, as a pressing element, a drive roller 1 which has a rolling surface 11 on its circumference, which is delimited on both sides by a collar 12 or 13.
  • the collars 12 and 13 prevent lateral expansion of the ring blank 9 during ring rolling, as best from the Figures 9 and 10 evident.
  • the drive roller 1 is rotatably mounted on a bearing plate 15 via a shaft 14 and is driven by means of a drive device 10.
  • the bearing plate 15 is attached, for example, via three rail gripping elements 151, 152 and 153 in the direction of a turret drum rotation axis 39, adjustable above and below, to a respective rail 81 and 82, which in turn are firmly anchored in a machine frame 8.
  • an adjusting spindle 154 By means of an adjusting spindle 154, the bearing plate 15 and thus the drive roller 1 mounted on it can be adjusted in the direction of the roll gap, whereby the size of the roll gap can be adjusted at its narrowest point.
  • the adjusting spindle 154 has, for example, an external thread which engages in an internal thread in a passage 83 through the machine frame 8, through which the adjusting spindle 154 is arranged.
  • the ring blank 9 is rolled between the drive roller 1 and a mandrel 2 which is rotatably mounted in a revolver drum 3.
  • Fig. 2 It can be seen that in the present revolver drum 3 five mandrels 2 are evenly distributed, based on the revolver drum rotation axis 39 at an angular distance of 72 °, rotatably.
  • the revolver drum 3 is rotatably mounted on the machine frame 8 via a shaft 33 and is rotated by means of a drive device 30, for example an electric drive or servomotor.
  • the ring rolling device shown has a ring blank feed device 5.
  • the ring blank feed device 5 is designed to individually feed ring blanks 9 to a point at which a mandrel 2 can be pushed through the fed ring blank 9, that is to say a loading position.
  • the ring blank feed device 5 has a storage shaft 51 in which a plurality of ring blanks 9 can be stored.
  • the storage shaft 51 is provided at its lower end with an opening through which a Ring blank 9 reaches the loading position directly due to gravity.
  • an articulated retaining element 52 is provided, which is held in a retaining position by means of a spring element 54 acting on a cam roller 53, in which it holds the ring blanks 9 in the storage shaft 51.
  • a control cam 55 which is rotatably arranged about the turret drum axis 39, acts against the spring force on the cam roller 53.
  • the ring rolling device has a mandrel adjustment device 4 for adjusting the mandrel 2 in the longitudinal direction of the mandrel 2. Since the ring blank 9 is stored around the mandrel 2 and the rolled ring 90 is removed from the mandrel 2 at two different points, namely on the one hand directly below the storage shaft 51 and on the other hand after approximately 150 ° of the revolver drum 3 has been rotated the mandrel adjusting device 4 has two separate adjusting cylinders 41 and 42 which are fastened to the machine frame 8.
  • a discharge channel 6 is arranged below the point where the ring is removed.
  • Fig. 3 largely corresponds Fig. 2 , the only difference is that the revolver drum is 3 in Fig. 3 is turned about 10 ° further counterclockwise than in Fig. 2 .
  • a first ring blank 9 is in the loading position directly below the storage shaft 51 and a first mandrel 2 is just being pushed through this first ring blank 9.
  • the revolver drum 3 is rotated by about 10 ° counterclockwise.
  • the first ring blank 9 initially remains in the loading position directly below the storage shaft 51, but it can be seen that the first mandrel 2 has rotated about 10 ° and is now resting on the left inner side of the first ring blank 9 so that it this will drag along with further rotation.
  • the second ring blank 9 has come into contact with the latter as a result of the rotation of the revolver drum 3 due to the reduction in the roll gap between the second mandrel 2 and the drive roller 1 and has been rolled to a smaller thickness.
  • the drive roller 1 which preferably rotates at constant speed and is driven by the drive device 10
  • a torque is transmitted to the ring blank 9, so that it, together with the rotatably mounted second mandrel 2, starts rotating about the axis of rotation of the mandrel, i.e. its Central axis, is brought around.
  • Rotating the ring blank three to thirty times, in particular eight to twelve times, preferably about ten times, during rolling has proven to be particularly advantageous, depending on the size of the ring blank and the desired wall thickness reduction.
  • the rotational speeds of the drive roller 1 and the revolver drum 3 are selected appropriately.
  • the multiple turning of the ring blank 9 during the ring rolling enables a greater reduction in thickness and a more even, more material-friendly rolling.
  • the mandrel adjusting device 4 comprises two separate adjusting cylinders 41 and 42 fastened to the machine frame 8.
  • the adjusting cylinder 41 comprises an extendable piston 411 to which a pusher head 412 is fastened.
  • the pushing head 412 hits the in Fig. 4 shown situation against a head 21 of the mandrel 2 and thus when the piston 411 is extended, the mandrel 2 in the mandrel longitudinal direction into the revolver drum 3, where it is inserted through a ring blank 9 located in the loading position.
  • the adjusting cylinder 42 comprises an extendable piston 421 to which a gripping head 422 is attached.
  • the gripping head 422 engages behind in the Figures 4 and 5 situations shown, the mandrel head 21 of a further mandrel 2 and thus pulls this mandrel 2 in the mandrel longitudinal direction out of the revolver drum 3 and thus also out of the completely rolled ring 90 in this revolver drum position.
  • Fig. 4 the mandrel 2 is still in the starting position in the revolver drum 3, while it is in Fig. 5 has partially moved out of the revolver drum 3.
  • the rear engaging head 422 engages behind the mandrel head 21 by rotating the turret drum 3, as a result of which the mandrel head 21 is pushed over a rear engaging part 4220 of the rear engaging head 422.
  • This rear engagement part 4220 is best in Fig. 6 recognizable.
  • the ring rolling device has a hold-down device 40 which is fastened in a flange-like manner around a mounting tube 81 attached to the machine frame 8.
  • This hold-down 40 forms a stop for the mandrel head 21, as best Fig. 5 evident.
  • the revolver drum 3 in the illustrated embodiment is two spaced apart via a shaft 33 (see Fig. 2 ) rotatably interconnected, disk-like drum parts 31 and 32, in each of which a part of the mandrel 2 is rotatably mounted, so that a central part of the mandrel 2, around which a ring blank 9 is mounted, is exposed between the two disk-like drum parts 31, 32.
  • a spacer ring 34 is arranged between the two disk-like drum parts 31, 32 and defines the mutual distance.
  • the drum part 32 there are five mandrel passages 323 for the mandrels 2, which are arranged at an angular distance of 72 °.
  • the two disc-like drum parts 31, 32 each comprise at least two rotatably mounted support rollers 311, 312 or 321, 322 per mandrel 2.
  • These support rollers 311, 312, 321, 322 support the respective mandrel 2 in the direction of Turret drum rotation axis 39 down so that the mandrel 2 is located between the support rollers 311, 312, 321, 322 and the drive roller 1 during rolling.
  • Fig. 7 shows a sectional view of a mandrel 2 with mandrel head 21, which is supported by two support rollers 321, 322. It can be seen that the support rollers 321, 322, as well as the support rollers 311, 312 not shown here, are designed as roller bearings, with inner rollers 3212 and 3222 and outer rollers 3211 and 3221, respectively.
  • the Figures 8-10 show a second embodiment of the ring rolling device, in which four support rollers each support a mandrel.
  • Fig. 8 is a perspective view of four support rollers 611, 612, 621, 622 which support a mandrel 2 on which a ring blank 9 is arranged.
  • Each support roller 611, 612, 621, 622 comprises an outer bearing part 6110, 6120, 6210, 6220, which is firmly connected to the revolver drum, and an inner roller 6111, 6121, 6211, 6221 which is rotatably arranged therein and which faces the opposite support roller End with a support flange 6112, 6122, 6212, 6222 for supporting the mandrel 2 are provided. It can be seen that the support flanges 6112, 6122, 6212, 6222 serve as lateral guides for the ring blank 9.
  • FIG. 9 and 10 the support rollers 611, 612, 621, 622 and further support rollers 661 and 662 are arranged in a turret drum 603, wherein Fig. 10 a section along the line FF in Fig. 9 shows.
  • the revolver drum 603 comprises two disk-like drum parts 631, 632 which are spaced apart from one another and are rigidly connected to one another in a rotationally rigid manner, in each of which a part of each mandrel 2 is rotatably mounted.
  • the support rollers 661, 662 each have an outer bearing part 6610, 6620 which is firmly connected to the drum part 631 and 632, respectively.
  • inner rollers 6611, 6621 are rotatably arranged like roller bearings.
  • the inner rollers 6611, 6621 are provided with support flanges 6612, 6622 at their end facing the opposite support roller.
  • FIG. 10 From the upper part of Fig. 10 it can be seen how the mandrel 2 is supported by the support flanges 6112 and 6212. A stop 636 for one end of the mandrel 2 is arranged in the drum part 631.
  • FIG. 11 and 12 a third embodiment of a rotatable mounting of a mandrel 702 in a revolver drum 703 is shown.
  • the revolver drum 703 comprises two disk-like drum parts 731 and 732, which are spaced apart from one another and are rigidly connected to one another via a shaft 733.
  • the stop 736 has an internally conical stop surface 7360, against which the conically shaped one end of the mandrel 702 rests when the mandrel 702 is completely retracted into the revolver drum 703 (see FIG Fig. 12 ).
  • the stop 736 positions the mandrel 702 both longitudinally and laterally.
  • the drum part 732 comprises a guide bushing 737 in which a tubular mandrel holder 738 is adjustably guided in the longitudinal direction of the mandrel.
  • the end of the mandrel 702 facing away from the conical end is rotatably held in the mandrel holder 738 via a roller bearing 735.
  • the mandrel 702 can be removed from the in Fig. 11 extended position shown in Fig. 12 The retracted position shown and vice versa can be adjusted.
  • the mandrel 702 is precisely positioned both in the longitudinal direction and laterally by the stop 736. This is particularly important when the rolling surface 11 of the drive roller 1 and / or the central part of the mandrel 702 carrying the ring blank 9 is profiled and the rolled ring is to have a specific profile.
  • the mandrel 702 has an annular bead 720, on the basis of which the ring blank 9 is provided with an annular groove during ring rolling. Thanks to the stop 736, this annular groove is produced at the correct point on the annular blank 9.
  • the other components of the ring rolling device according to this third exemplary embodiment can be designed essentially as described above in connection with the first exemplary embodiment.
  • the mandrel adjustment device 4 simply engages the mandrel holder 738 instead of directly on the mandrel.
  • Fig. 13 shows a fourth embodiment of a rotatable mounting of a mandrel 802 in a revolver drum 803.
  • the revolver drum 803 comprises two spaced apart, rotatably connected to each other via a shaft, not shown, disc-like drum parts 831 and 832 Dorns 802 firmly anchored.
  • the lateral guidance for this end of the mandrel 802 takes place by means of an angled lateral guide element 837 which is provided with a passage for the mandrel 802.
  • the drum part 832 comprises a guide bushing 838 and an angled lateral guide element 839 provided with a passage for the mandrel 802.
  • the mandrel 802 is exactly positioned both in the longitudinal direction and laterally, which in turn is important because the mandrel 802 in the present case has an annular bead 820 due to which the ring blank 9 is provided with an annular groove during ring rolling.
  • the other components of the ring rolling device according to this fourth exemplary embodiment can essentially be designed as described above in connection with the first exemplary embodiment.
  • Fig. 14 shows an exemplary path-time diagram and Fig. 15 a corresponding exemplary torque-time diagram of the rotation of the revolver drum of a ring rolling device according to the invention.
  • the revolver drum initially stands still for a certain period of time. During this time, a ring blank 9 is in the loading position and a mandrel is pushed through the ring blank 9 and moved into the revolver drum up to a possible stop. The revolving drum 3 is then set in rotation and the said mandrel with the ring blank 9 mounted around it is rotated towards the drive roller 1. This initially requires a rapidly increasing initial torque, which then decreases and even becomes negative until the ring blank 9 is roughly prepositioned in front of the drive roller 1. During this time, the revolver drum rotates through a relatively large angle of rotation of approx. 60 °.
  • the ring blank 9 is then precisely positioned with initially increasing and then decreasing torque, which is carried out significantly more slowly, that is to say the rotational speed of the revolver drum is significantly lower. As soon as the ring blank 9 then strikes the drive roller 1 in the roll gap and the actual ring rolling begins, the required torque increases rapidly in a very short time. During the actual ring rolling, the torque decreases continuously to 0 again. Then a new cycle begins.
  • the feeding of the ring blanks to the revolver drum can alternatively also take place via pivotable mandrels or via mandrels mounted in a conveyor chain.

Description

Die vorliegende Erfindung betrifft eine Ringwalzvorrichtung gemäss dem Oberbegriff des unabhängigen Patentanspruchs 1.The present invention relates to a ring rolling device according to the preamble of independent claim 1.

Eine bekannte Variante zum Herstellen von Ringen, beispielsweise für Kugellager, besteht darin, zunächst einen Ringrohling zu Schmieden, der dann durch Ringwalzen weiterverarbeitet wird. Zum Ringwalzen wird der Ringrohling um einen Dorn herum gelagert und dann zwischen dem Dorn und einer Umformwalze gewalzt. Dabei wird die Dicke des Ringrohlings reduziert und gleichzeitig sein Umfang vergrössert, da kein Material entfernt wird. Zur Reduzierung der Dicke des Ringrohlings muss der Walzspalt zwischen dem Dorn und der Umformwalze kontinuierlich verringert werden, was beispielsweise durch eine Verschiebung des Dorns zur Umformwalze hin oder umgekehrt erfolgen kann.A known variant for producing rings, for example for ball bearings, consists in first forging a ring blank, which is then further processed by ring rolling. For ring rolling, the ring blank is mounted around a mandrel and then rolled between the mandrel and a forming roller. The thickness of the ring blank is reduced and its circumference is increased at the same time, since no material is removed. To reduce the thickness of the ring blank, the roll gap between the mandrel and the forming roller must be continuously reduced, which can be done, for example, by moving the mandrel towards the forming roller or vice versa.

Bei einer in der US 4 173 877 A offenbarten Ringwalzvorrichtung ist die Umformwalze so ausgebildet, dass sich ihr Radius ausgehend von einer Startzone entgegen der Walzdrehrichtung kontinuierlich vergrössert. Während des Walzens durch Drehen der Umformwalze erfolgt so bei konstantem Abstand des Dorns eine kontinuierliche Verkleinerung des Walzspalts, wodurch der Ringrohling zu einer kleineren Dicke gewalzt wird. Bei dieser Ringwalzvorrichtung sind vier Dorne an einem Drehtisch gelagert, so dass durch Drehen des Drehtischs um 90° jeweils der nächste Dorn mit dem nächsten zuvor darum herum angeordneten Ringrohling zur Umformwalze hin in die Walzposition gedreht wird. Dieses Drehen erfolgt genau dann, wenn dem Drehtisch die Startzone der Umformwalze zugewandt ist, wo der Ringrohling noch nicht mit der Umformwalze in Kontakt kommt. Das Walzen des Ringrohlings erfolgt erst danach durch Drehen der Umformwalze, während der Drehtisch sich nicht mehr dreht.At one in the U.S. 4,173,877 A disclosed ring rolling device, the forming roller is designed so that its radius increases continuously starting from a starting zone against the direction of rolling rotation. During rolling by rotating the forming roller, the roll gap is continuously reduced with a constant distance between the mandrel, whereby the ring blank is rolled to a smaller thickness. In this ring rolling device, four mandrels are mounted on a turntable, so that by turning the turntable through 90 ° the next mandrel with the next ring blank previously arranged around it is rotated towards the forming roller into the rolling position. This turning takes place exactly when the starting zone of the forming roller faces the turntable, where the ring blank does not yet come into contact with the forming roller. The ring blank is only rolled afterwards by rotating the forming roller while the turntable no longer rotates.

Ein Nachteil dieser Ringwalzvorrichtung besteht darin, dass sie eine speziell geformte Umformwalze benötigt. Ausserdem muss das Walzen des Ringrohlings während genau einer Umdrehung der Umformwalze erfolgen und der nächste Ringrohling muss durch ein darauf abgestimmtes Drehen des Drehtischs genau zum richtigen Zeitpunkt in die Walzposition gebracht werden.A disadvantage of this ring rolling device is that it requires a specially shaped forming roll. In addition, the ring blank must be rolled during exactly one revolution of the forming roller and the next ring blank must be brought into the rolling position at exactly the right time by rotating the turntable in a coordinated manner.

In der gattungsgemässen DE 703 436 C ist eine Ringwalzvorrichtung offenbart, die eine Walze als Presselement und einen Drehtisch mit mehreren darin drehbar gelagerten Dornen umfasst, um die herum die zu walzenden Ringrohlinge gelagert sind. Durch Drehen des Drehtischs sind die Dorne zum Presselement hin und wieder von diesem weg bewegbar. Dabei wird zwischen dem Dorn und dem Presselement ein sich verkleinernder Walzspalt gebildet, in dem der Ringrohling gewalzt wird. Die Dorne greifen unten jeweils in eine kegelige Bohrung in einem im Drehtisch drehbar gelagerten Dornwalzenzapfen ein und sind oben jeweils mit einem zweiten Dornwalzenzapfen fest verbunden.In the generic DE 703 436 C a ring rolling device is disclosed which comprises a roller as a pressing element and a turntable with a plurality of mandrels rotatably mounted therein, around which the ring blanks to be rolled are mounted. By rotating the turntable, the mandrels can be moved towards the pressing element and away from it again. In this case, a decreasing roll gap is formed between the mandrel and the pressing element, in which the ring blank is rolled. At the bottom, the mandrels each engage in a conical bore in a mandrel roller journal that is rotatably mounted in the turntable and are firmly connected to a second mandrel roller journal at the top.

Nachteile dieser Ringwalzvorrichtung sind die relativ unpräzise Lagerung der Dorne, was zu Walzungenauigkeiten führt, und der grosse, relativ schwere Drehtisch, was den Betrieb verlangsamt.Disadvantages of this ring rolling device are the relatively imprecise mounting of the mandrels, which leads to rolling inaccuracies, and the large, relatively heavy turntable, which slows down operation.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, eine Ringwalzvorrichtung der eingangs erwähnten Art zu schaffen, die ein schnelles und exaktes Zuführen und Walzen von Ringrohlingen ermöglicht.The present invention is therefore based on the object of creating a ring rolling device of the type mentioned at the outset which enables ring blanks to be fed and rolled quickly and precisely.

Diese Aufgabe wird durch die erfindungsgemässe Ringwalzvorrichtung gelöst, wie sie im unabhängigen Patentanspruch 1 definiert ist. Besonders vorteilhafte Ausführungsvarianten der Erfindung ergeben sich aus den abhängigen Patentansprüchen.This object is achieved by the ring rolling device according to the invention, as it is defined in independent patent claim 1. Particularly advantageous design variants of the invention emerge from the dependent claims.

Das Wesen der Erfindung besteht im Folgenden: Eine Ringwalzvorrichtung zum Aufweiten eines Ringrohlings umfasst ein Presselement, einen drehbar gelagerten Dorn, um den herum der Ringrohling lagerbar ist, und eine drehbare Revolvertrommel, in der der Dorn drehbar gelagert ist. Durch Drehen der Revolvertrommel ist der Dorn zum Presselement hin und wieder von diesem weg bewegbar. Die Revolvertrommel ist relativ zum Presselement so angeordnet, dass durch Drehen der Revolvertrommel zwischen dem Dorn und dem Presselement ein sich verkleinernder Walzspalt gebildet wird, in dem der Ringrohling während des Drehens der Revolvertrommel gewalzt wird. Erfindungsgemäss weist die Revolvertrommel zur drehbaren Lagerung des Dorns mindestens zwei drehbar gelagerte Stützrollen auf, die den Dorn in Richtung zur Revolvertrommeldrehachse hin abstützen, so dass der Dorn sich während des Walzens zwischen den Stützrollen und dem Presselement befindet.The essence of the invention is as follows: A ring rolling device for expanding a ring blank comprises a pressing element, a rotatably mounted mandrel around which the ring blank can be mounted, and a rotatable revolver drum in which the mandrel is rotatably mounted. By rotating the revolver drum, the mandrel can be moved towards and away from the pressing element. The revolver drum is arranged relative to the pressing element in such a way that by rotating the revolving drum between the mandrel and the pressing element, a decreasing roll gap is formed in which the ring blank is rolled while the revolving drum is rotating. According to the invention, the revolver drum for the rotatable mounting of the mandrel has at least two rotatably mounted support rollers which support the mandrel in the direction of the revolver drum rotation axis so that the mandrel is between the support rollers and the pressing element during rolling.

Die erfindungsgemässe Ringwalzvorrichtung hat den Vorteil, dass sowohl das Zuführen des Ringrohlings in die Walzposition als auch das Walzen des Ringrohlings durch das Drehen der Revolvertrommel zum Presselement hin erfolgt. Durch dieses Drehen wird zunächst ein Walzspalt gebildet und der Ringrohling mit dem Presselement in Kontakt gebracht und anschliessend der Walzspalt verkleinert, wodurch der Ringrohling zwischen dem Dorn und dem Presselement gewalzt wird, das heisst die Wanddicke des Ringrohlings reduziert wird.The ring rolling device according to the invention has the advantage that both the feeding of the ring blank into the rolling position and the rolling of the ring blank take place by rotating the turret drum towards the pressing element. This turning first forms a roll gap and the ring blank is brought into contact with the press element and then the roll gap is reduced, whereby the ring blank is rolled between the mandrel and the press element, i.e. the wall thickness of the ring blank is reduced.

Die mindestens zwei drehbar gelagerten Stützrollen ermöglichen eine Abstützung des Dorns während des Walzens zur Aufnahme der Walzkräfte über eine gewünschte Dornlänge sowie ein Drehen des Dorns während des Walzens um seine Dorndrehachse. Auf diese Weise kann eine hohe Walzpräzision erreicht werden. Ausserdem braucht der Dorn nur auf die Stützrollen aufgesetzt zu werden, was sehr schnell erfolgen kann.The at least two rotatably mounted support rollers enable the mandrel to be supported during rolling to absorb the rolling forces over a desired mandrel length and to rotate the mandrel about its mandrel axis of rotation during rolling. In this way, a high rolling precision can be achieved. In addition, the mandrel only needs to be placed on the support rollers, which can be done very quickly.

Die Drehachsen des Dorns und der Stützrollen sowie die Revolvertrommeldrehachse und, falls das Presselement eine Triebwalze ist, dessen Drehachse sind vorzugsweise parallel, dies ist aber nicht unbedingt notwendig.The axes of rotation of the mandrel and the support rollers as well as the turret drum axis of rotation and, if the pressing element is a drive roller, its axis of rotation are preferably parallel, but this is not absolutely necessary.

Vorzugsweise umfasst bei der erfindungsgemässen Ringwalzvorrichtung die Revolvertrommel zwei voneinander beabstandete, drehstarr miteinander verbundene, scheibenartige Trommelteile, in denen je ein Teil des Dorns drehbar gelagert ist, so dass ein Mittelteil des Dorns zwischen den beiden scheibenartigen Trommelteilen zur Lagerung eines Ringrohlings freiliegt. Durch die beiden drehstarr miteinander verbundenen, scheibenartigen Trommelteile kann der Dorn auf beiden Seiten des den Ringrohling lagernden Mittelteils stabil und gleichzeitig drehbar gelagert werden.In the ring rolling device according to the invention, the turret drum preferably comprises two spaced apart, torsionally rigidly connected to one another, disk-like drum parts, in each of which a part of the mandrel is rotatably mounted, so that a central part of the mandrel is exposed between the two disk-like drum parts for mounting a ring blank. Due to the two disk-like drum parts connected rigidly to one another, the mandrel can be mounted in a stable and simultaneously rotatable manner on both sides of the central part mounting the ring blank.

Bei einer vorteilhaften Ausführungsvariante weisen die scheibenartigen Trommelteile zur drehbaren Lagerung des Dorns je mindestens zwei drehbar gelagerte Stützrollen auf, die den Dorn in Richtung zur Revolvertrommeldrehachse hin abstützen, so dass der Dorn sich während des Walzens zwischen den Stützrollen und dem Presselement befindet. Die je mindestens zwei Stützrollen ermöglichen eine Abstützung des Dorns beidseits des Mittelteils zur Aufnahme der Walzkräfte über eine gewünschte Dornlänge sowie ein Drehen des Dorns während des Walzens um seine Dorndrehachse.In an advantageous embodiment, the disk-like drum parts for the rotatable mounting of the mandrel each have at least two rotatably mounted support rollers that support the mandrel in the direction of the turret drum axis of rotation so that the mandrel is between the support rollers and the pressing element during rolling. The at least two support rollers each enable the mandrel to be supported on both sides of the central part to absorb the rolling forces over a desired mandrel length and to rotate the mandrel about its mandrel axis of rotation during rolling.

Mit Vorteil weist jede Stützrolle einen Stützflansch zur Abstützung des Dorns auf. Der Dorn liegt dann nur auf den Stützflanschen auf, was ein einfacheres Aufsetzen ermöglicht.Each support roller advantageously has a support flange for supporting the mandrel. The mandrel then only rests on the support flanges, which enables easier placement.

Vorzugsweise sind die Stützflansche jeweils an einem Ende der Stützrollen angeordnet und dienen als seitliche Führungen für den Ringrohling. Der Ringrohling kann so während des Walzens ohne zusätzliche Bauteile stabilisiert werden.The support flanges are preferably each arranged at one end of the support rollers and serve as lateral guides for the ring blank. The ring blank can thus be stabilized during rolling without additional components.

Bei einer weiteren vorteilhaften Ausführungsvariante ist der Dorn in der Revolvertrommel in mindestens einem Wälzlager drehbar gelagert. Wälzlager ermöglichen ebenfalls eine gute Abstützung des Dorns zur Aufnahme der Walzkräfte über eine gewünschte Dornlänge sowie ein Drehen des Dorns während des Walzens um seine Dorndrehachse.In a further advantageous embodiment variant, the mandrel is rotatably mounted in at least one roller bearing in the revolver drum. Rolling bearings also enable the mandrel to be well supported to absorb the rolling forces over a desired mandrel length and to rotate the mandrel about its mandrel axis of rotation during rolling.

Wälzlager und Stützrollen können auch miteinander kombiniert werden. Insbesondere ist es möglich, auf der einen Seite des Dorns ein Wälzlager und auf der anderen Seite Stützrollen vorzusehen.Rolling bearings and support rollers can also be combined with one another. In particular, it is possible to provide a roller bearing on one side of the mandrel and support rollers on the other side.

Vorzugsweise weist die Revolvertrommel einen Anschlag zur Positionierung des Dorns in Längsrichtung des Dorns auf. Dies ermöglicht eine genaue Positionierung des Dorns und des darauf angeordneten Ringrohlings für das Walzen und ist insbesondere dann von Bedeutung, wenn der Dorn und/oder das Presselement eine Profilierung aufweist, die auf den Ringrohling übertragen werden soll.The revolver drum preferably has a stop for positioning the mandrel in the longitudinal direction of the mandrel. This enables precise positioning of the mandrel and the ring blank arranged thereon for rolling and is particularly important when the mandrel and / or the pressing element has a profile that is to be transferred to the ring blank.

Mit Vorteil weist die erfindungsgemässe Ringwalzvorrichtung eine Dornverstelleinrichtung zum Verstellen des Dorns in Längsrichtung des Dorns auf. Dies ermöglicht es, durch Zurückziehen des Dorns, Zuführen eines Ringrohlings in eine Ladeposition und wieder Vorstossen des Dorns und Durchstecken des Dorns durch den sich in der Ladeposition befindlichen Ringrohling diesen Ringrohling auf einfache Weise um den Dorn herum anzuordnen bzw. zu lagern. Umgekehrt kann mit derselben oder einer weiteren Dornverstelleinrichtung der fertig gewalzte Ring durch Zurückziehen des Dorns wieder vom Dorn entfernt werden.The ring rolling device according to the invention advantageously has a mandrel adjusting device for adjusting the mandrel in the longitudinal direction of the mandrel. This makes it possible to easily arrange or store this ring blank around the mandrel by withdrawing the mandrel, feeding a ring blank into a loading position and pushing the mandrel forward again and pushing the mandrel through the ring blank located in the loading position. Conversely, the completely rolled ring can be removed from the mandrel again by pulling back the mandrel with the same or a further mandrel adjusting device.

Vorzugsweise weist die erfindungsgemässe Ringwalzvorrichtung eine Ringrohlingzuführeinrichtung auf, mit welcher Ringrohlinge einzeln einer Stelle zuführbar sind, an der der Dorn durch den zugeführten Ringrohling durchsteckbar ist, das heisst der oben genannten Ladeposition. Dies ermöglicht zusammen mit der Dornverstelleinrichtung auf einfache Weise das Lagern bzw. Anordnen eines Ringrohlings um den Dorn herum.The ring rolling device according to the invention preferably has a ring blank feed device with which ring blanks can be fed individually to a point at which the mandrel can be pushed through the fed ring blank, that is to say the above-mentioned loading position. Together with the mandrel adjustment device, this enables a ring blank to be stored or arranged around the mandrel in a simple manner.

Mit Vorteil sind in der Revolvertrommel mehrere Dorne drehbar gelagert. Dadurch können gleichzeitig an verschiedenen Stationen verschiedene Verfahren ablaufen. Beispielsweise kann an einer ersten Station ein Ringrohling um einen Dorn herum gelagert werden, an einer zweiten Station ein Ringrohling gewalzt werden und an einer dritten Station ein Ringrohling von einem Dorn entfernt werden. Der Walzdurchsatz kann so erheblich erhöht werden, das heisst in kürzerer Zeit können mehr Ringrohlinge zu Ringen gewalzt werden.Several mandrels are advantageously rotatably mounted in the revolver drum. This means that different processes can run simultaneously at different stations. For example, a ring blank can be stored around a mandrel at a first station, a ring blank can be rolled at a second station and a ring blank can be removed from a mandrel at a third station. The rolling throughput can be increased considerably, that is, more ring blanks can be rolled into rings in a shorter time.

Aufgrund des höheren Walzdurchsatzes wird ein Ringwalzen im Takt des Herstellens von Ringrohlingen möglich und die Ringwalzvorrichtung kann beispielsweise an eine Kalt- oder Warmumformmaschine angegliedert werden. Bei einem Angliedern an eine Warmumformmaschine kann so der Vorteil ausgenutzt werden, dass direkt die von der Warmumformmaschine hergestellten, noch warmen Ringrohlinge mit der Ringwalzvorrichtung gewalzt werden können. Ein zusätzliches Aufwärmen der Ringrohlinge kann so für ein Warm-Ringwalzen entfallen. Grundsätzlich ist aber ein vorgängiges Aufwärmen der Ringrohlinge vor dem Ringwalzen möglich und erfindungsgemässe Ringwalzvorrichtungen sind sowohl für ein Warm-Ringwalzen als auch ein Kalt-Ringwalzen einsetzbar.Due to the higher rolling throughput, ring rolling is possible in step with the production of ring blanks and the ring rolling device can, for example, be attached to a cold or hot forming machine. In connection with a hot forming machine, the advantage can be used that the still warm ring blanks produced by the hot forming machine can be rolled directly with the ring rolling device. Additional heating of the ring blanks can thus be dispensed with for hot ring rolling. In principle, however, the ring blanks can be heated beforehand before ring rolling, and ring rolling devices according to the invention can be used for both hot ring rolling and cold ring rolling.

Beim Warm-Ringwalzen kann gegebenenfalls eine Kühlung der Komponenten der Walzeinrichtung, wie z.B. Dorn, Presselement, Triebwalze etc., vorgesehen sein.In the case of hot ring rolling, the components of the rolling device, such as mandrel, press element, drive roller, etc., can optionally be cooled.

Vorzugsweise weist die erfindungsgemässe Ringwalzvorrichtung eine Antriebseinrichtung zum Antreiben des Presselements auf, so dass der Ringrohling während des Walzens durch die Bewegung des Presselements drehbar ist. Dies ermöglicht es, den Ringrohling auf dem drehbar gelagerten Dorn mit Hilfe des Presselements während des Walzens mehrmals zu drehen, wobei der Ringrohling bei jeder Drehung zu einer kleineren Dicke gewalzt wird. Auf diese Weise kann eine grössere Dickenreduktion und ein gleichmässigeres, materialschonenderes Walzen erreicht werden. Als besonders vorteilhaft hat sich ein - abhängig von der Grösse des Ringrohlings und der angestrebten Wanddickenreduktion - drei- bis dreissigmaliges, insbesondere acht- bis zwölfmaliges, Drehen des Ringrohlings während des Walzens erwiesen.The ring rolling device according to the invention preferably has a drive device for driving the pressing element, so that the ring blank can be rotated during rolling by the movement of the pressing element. This enables the ring blank to be rotated several times on the rotatably mounted mandrel with the aid of the pressing element during rolling, the ring blank being rolled to a smaller thickness with each rotation. In this way, a greater reduction in thickness and more even, more material-friendly rolling can be achieved. Rotating the ring blank three to thirty times, in particular eight to twelve times, during rolling has proven to be particularly advantageous, depending on the size of the ring blank and the desired wall thickness reduction.

Mit Vorteil ist das Presselement eine drehbar gelagerte Triebwalze. Eine solche Triebwalze kann beispielsweise mittels eines Motors kontinuierlich angetrieben werden und ihrerseits ihre Drehbewegung auf den um den Dorn herum gelagerten Ringrohling übertragen, sobald dieser mit der Triebwalze in Kontakt kommt. Im Vergleich zu einem linearen Presselement, welches bei der erfindungsgemässen Ringwalzvorrichtung auch denkbar wäre, kann das Drehen der Triebwalze kontinuierlich und mit konstanter Geschwindigkeit erfolgen, ein wieder Zurückstellen des Presselements nach dem Walzen entfällt.The pressing element is advantageously a rotatably mounted drive roller. Such a drive roller can be driven continuously, for example by means of a motor, and in turn its rotational movement on the Transfer ring blank stored around the mandrel as soon as it comes into contact with the drive roller. In comparison to a linear pressing element, which would also be conceivable with the ring rolling device according to the invention, the rotating of the drive roller can take place continuously and at a constant speed; there is no need to reset the pressing element again after rolling.

Im Folgenden wird die erfindungsgemässe Ringwalzvorrichtung unter Bezugnahme auf die beigefügten Zeichnungen anhand von Ausführungsbeispielen detaillierter beschrieben. Es zeigen:

Fig. 1 -
eine Perspektivansicht eines Ausführungsbeispiels einer erfindungsgemässen Ringwalzvorrichtung;
Fig. 2 -
einen Schnitt durch die Ringwalzvorrichtung von Fig. 1 kurz vor dem Walzen eines Ringrohlings;
Fig. 3 -
einen Schnitt durch die Ringwalzvorrichtung von Fig. 1 analog Fig. 2, jedoch während des Walzens eines Ringrohlings;
Fig. 4-6 -
verschiedene perspektivische Detailansichten von Teilen der Ringwalzvorrichtung von Fig. 1;
Fig. 7 -
eine Schnittansicht eines Dorns und zweier Stützrollen der Ringwalzvorrichtung von Fig. 1;
Fig. 8 -
ein zweites Ausführungsbeispiel von vier Stützrollen, die einen Dorn abstützen;
Fig. 9 -
Stützrollen und Dorne gemäss Fig. 8 in einer Revolvertrommel;
Fig. 10 -
einen Schnitt gemäss der Linie F-F in Fig. 9;
Fig. 11 -
ein drittes Ausführungsbeispiel einer drehbaren Lagerung eines Dorns mit aus einer Lagerseite herausgezogenem Dorn;
Fig. 12 -
die Dornlagerung von Fig. 11 mit beidseitig drehbar gelagertem Dorn;
Fig. 13 -
ein viertes Ausführungsbeispiel einer drehbaren Lagerung eines Dorns;
Fig. 14 -
ein beispielhaftes Weg-Zeit-Diagramm der Drehung der Revolvertrommel einer erfindungsgemässen Ringwalzvorrichtung; und
Fig. 15 -
ein beispielhaftes Drehmoment-Zeit-Diagramm der Drehung der Revolvertrommel gemäss Fig. 14.
In the following, the ring rolling device according to the invention is described in more detail with reference to the accompanying drawings using exemplary embodiments. Show it:
Fig. 1 -
a perspective view of an embodiment of a ring rolling device according to the invention;
Fig. 2 -
a section through the ring rolling device of Fig. 1 shortly before rolling a ring blank;
Fig. 3 -
a section through the ring rolling device of Fig. 1 analogue Fig. 2 , but during the rolling of a ring blank;
Fig. 4-6 -
various perspective detailed views of parts of the ring rolling device of FIG Fig. 1 ;
Fig. 7 -
a sectional view of a mandrel and two support rollers of the ring rolling device of FIG Fig. 1 ;
Fig. 8 -
a second embodiment of four support rollers that support a mandrel;
Fig. 9 -
Support rollers and mandrels according to Fig. 8 in a revolver drum;
Fig. 10 -
a section along the line FF in Fig. 9 ;
Fig. 11 -
a third embodiment of a rotatable mounting of a mandrel with a mandrel pulled out of a bearing side;
Fig. 12 -
the mandrel storage of Fig. 11 with mandrel pivoted on both sides;
Fig. 13 -
a fourth embodiment of a rotatable mounting of a mandrel;
Fig. 14 -
an exemplary path-time diagram of the rotation of the revolver drum of a ring rolling device according to the invention; and
Fig. 15 -
an exemplary torque-time diagram of the rotation of the turret drum according to FIG Fig. 14 .

Für die nachstehende Beschreibung gilt die folgende Festlegung: Sind in einer Figur zum Zweck zeichnerischer Eindeutigkeit Bezugszeichen angegeben, aber im unmittelbar zugehörigen Beschreibungsteil nicht erwähnt, so wird auf deren Erläuterung in vorangehenden oder nachfolgenden Beschreibungsteilen verwiesen. Umgekehrt sind zur Vermeidung zeichnerischer Überladung für das unmittelbare Verständnis weniger relevante Bezugszeichen nicht in allen Figuren eingetragen. Hierzu wird auf die jeweils übrigen Figuren verwiesen.The following definition applies to the following description: If reference symbols are given in a figure for the purpose of clarity of the drawing, but not mentioned in the directly associated part of the description, reference is made to their explanation in the preceding or following parts of the description. Conversely, in order to avoid overloading the drawings, less relevant reference symbols are not entered in all figures for immediate understanding. Reference is made to the other figures in each case.

Das in den Fig. 1 und 2 dargestellte Ausführungsbeispiel einer erfindungsgemässen Ringwalzvorrichtung umfasst als Presselement eine Triebwalze 1, die an ihrem Umfang eine Walzfläche 11 aufweist, welche beidseits durch einen Kragen 12 bzw. 13 begrenzt ist. Die Kragen 12 bzw. 13 verhindern während des Ringwalzens ein seitliches Ausdehnen des Ringrohlings 9, wie am besten aus den Fig. 9 und 10 ersichtlich. Die Triebwalze 1 ist über eine Welle 14 an einer Lagerplatte 15 drehbar gelagert und wird mittels einer Antriebseinrichtung 10 angetrieben.That in the Fig. 1 and 2 The illustrated embodiment of a ring rolling device according to the invention comprises, as a pressing element, a drive roller 1 which has a rolling surface 11 on its circumference, which is delimited on both sides by a collar 12 or 13. The collars 12 and 13 prevent lateral expansion of the ring blank 9 during ring rolling, as best from the Figures 9 and 10 evident. The drive roller 1 is rotatably mounted on a bearing plate 15 via a shaft 14 and is driven by means of a drive device 10.

Die Lagerplatte 15 ist beispielsweise über drei Schienengreifelemente 151, 152 und 153 in Richtung einer Revolvertrommeldrehachse 39 verstellbar oben und unten an je einer Schiene 81 bzw. 82 angebracht, die ihrerseits in einem Maschinenrahmen 8 fest verankert sind. Mittels einer Verstellspindel 154 kann die Lagerplatte 15 und damit die daran gelagerte Triebwalze 1 in Richtung Walzspalt verstellt werden, wodurch die Grösse des Walzspalts an seiner engsten Stelle eingestellt werden kann. Die Verstellspindel 154 weist zu diesem Zweck beispielsweise ein Aussengewinde auf, das in ein Innengewinde in einem Durchgang 83 durch den Maschinenrahmen 8 eingreift, durch den hindurch die Verstellspindel 154 angeordnet ist.The bearing plate 15 is attached, for example, via three rail gripping elements 151, 152 and 153 in the direction of a turret drum rotation axis 39, adjustable above and below, to a respective rail 81 and 82, which in turn are firmly anchored in a machine frame 8. By means of an adjusting spindle 154, the bearing plate 15 and thus the drive roller 1 mounted on it can be adjusted in the direction of the roll gap, whereby the size of the roll gap can be adjusted at its narrowest point. For this purpose, the adjusting spindle 154 has, for example, an external thread which engages in an internal thread in a passage 83 through the machine frame 8, through which the adjusting spindle 154 is arranged.

Beim Ringwalzen wird der Ringrohling 9 zwischen der Triebwalze 1 und einem Dorn 2 gewalzt, der in einer Revolvertrommel 3 drehbar gelagert ist. Fig. 2 kann entnommen werden, dass in der vorliegenden Revolvertrommel 3 fünf Dorne 2 gleichmässig verteilt, bezogen auf die Revolvertrommeldrehachse 39 in einem Winkelabstand von 72°, drehbar gelagert sind. Die Revolvertrommel 3 ist über eine Welle 33 am Maschinenrahmen 8 drehbar gelagert und wird mittels einer Antriebseinrichtung 30, beispielsweise ein elektrischer Antrieb bzw. Servomotor, gedreht.During ring rolling, the ring blank 9 is rolled between the drive roller 1 and a mandrel 2 which is rotatably mounted in a revolver drum 3. Fig. 2 It can be seen that in the present revolver drum 3 five mandrels 2 are evenly distributed, based on the revolver drum rotation axis 39 at an angular distance of 72 °, rotatably. The revolver drum 3 is rotatably mounted on the machine frame 8 via a shaft 33 and is rotated by means of a drive device 30, for example an electric drive or servomotor.

Zur Zuführung von Ringrohlingen 9 zu den Dornen 2 in der Revolvertrommel 3 weist die dargestellte Ringwalzvorrichtung eine Ringrohlingzuführeinrichtung 5 auf. Die Ringrohlingzuführeinrichtung 5 ist ausgebildet, um Ringrohlinge 9 einzeln einer Stelle zuzuführen, an der ein Dorn 2 durch den zugeführten Ringrohling 9 durchsteckbar ist, das heisst einer Ladeposition. Die Ringrohlingzuführeinrichtung 5 weist einen Vorratsschacht 51 auf, in dem mehrere Ringrohlinge 9 speicherbar sind. Der Vorratsschacht 51 ist an seinem unteren Ende mit einer Öffnung versehen, durch die hindurch ein Ringrohling 9 aufgrund der Schwerkraft direkt zur Ladeposition gelangt. Um zu verhindern, dass Ringrohlinge 9 unkontrolliert in Richtung Ladeposition fallen, ist ein gelenkig angeordnetes Rückhalteelement 52 vorhanden, das mittels eines auf eine Kurvenrolle 53 wirkenden Federelements 54 in einer Rückhalteposition gehalten wird, in der es die Ringrohlinge 9 im Vorratsschacht 51 hält. Zum Freigeben eines einzelnen Ringrohlings 9 wird mittels einer um die Revolvertrommeldrehachse 39 drehbar angeordneten Steuerkurve 55 einfach entgegen der Federkraft auf die Kurvenrolle 53 eingewirkt.To feed ring blanks 9 to the mandrels 2 in the revolver drum 3, the ring rolling device shown has a ring blank feed device 5. The ring blank feed device 5 is designed to individually feed ring blanks 9 to a point at which a mandrel 2 can be pushed through the fed ring blank 9, that is to say a loading position. The ring blank feed device 5 has a storage shaft 51 in which a plurality of ring blanks 9 can be stored. The storage shaft 51 is provided at its lower end with an opening through which a Ring blank 9 reaches the loading position directly due to gravity. In order to prevent ring blanks 9 from falling uncontrollably towards the loading position, an articulated retaining element 52 is provided, which is held in a retaining position by means of a spring element 54 acting on a cam roller 53, in which it holds the ring blanks 9 in the storage shaft 51. To release an individual ring blank 9, a control cam 55, which is rotatably arranged about the turret drum axis 39, acts against the spring force on the cam roller 53.

Um einen Ringrohling 9 um einen Dorn 2 herum lagern und später einen gewalzten Ring 90 wieder vom Dorn 2 entfernen zu können, weist die Ringwalzvorrichtung eine Dornverstelleinrichtung 4 zum Verstellen des Dorns 2 in Längsrichtung des Dorns 2 auf. Da das Lagern des Ringrohlings 9 um den Dorn 2 herum und das Entfernen des gewalzten Rings 90 vom Dorn 2 an zwei verschiedenen Stellen erfolgt, nämlich einerseits direkt unterhalb des Vorratsschachts 51 und andererseits etwa nach einer Drehung der Revolvertrommel 3 um ca. 150°, umfasst die Dornverstelleinrichtung 4 zwei separate Verstellzylinder 41 und 42, die am Maschinenrahmen 8 befestigt sind.In order to store a ring blank 9 around a mandrel 2 and later to be able to remove a rolled ring 90 again from the mandrel 2, the ring rolling device has a mandrel adjustment device 4 for adjusting the mandrel 2 in the longitudinal direction of the mandrel 2. Since the ring blank 9 is stored around the mandrel 2 and the rolled ring 90 is removed from the mandrel 2 at two different points, namely on the one hand directly below the storage shaft 51 and on the other hand after approximately 150 ° of the revolver drum 3 has been rotated the mandrel adjusting device 4 has two separate adjusting cylinders 41 and 42 which are fastened to the machine frame 8.

Zur Abführung des gewalzten Rings 90 nach der Entfernung vom Dorn 2 ist bei der dargestellten Ringwalzvorrichtung ein Abführkanal 6 unterhalb der Stelle der Ringentfernung angeordnet.To remove the rolled ring 90 after it has been removed from the mandrel 2, in the illustrated ring rolling device, a discharge channel 6 is arranged below the point where the ring is removed.

Fig. 3 entspricht weitgehend Fig. 2, der Unterschied besteht nur darin, dass die Revolvertrommel 3 in Fig. 3 etwa 10° im Gegenuhrzeigersinn weiter gedreht ist als in Fig. 2. Fig. 3 largely corresponds Fig. 2 , the only difference is that the revolver drum is 3 in Fig. 3 is turned about 10 ° further counterclockwise than in Fig. 2 .

In Fig. 2 befindet sich ein erster Ringrohling 9 in der Ladeposition direkt unterhalb des Vorratsschachts 51 und es wird gerade ein erster Dorn 2 durch diesen ersten Ringrohling 9 durchgesteckt. Ein zweiter Ringrohling 9, der um einen zweiten Dorn 2 herum gelagert ist, welcher sich in einem Winkelabstand von 72° zum ersten Dorn 2 befindet, steht kurz vor dem Kontakt mit der Triebwalze 1, ist also noch nicht gewalzt worden.In Fig. 2 a first ring blank 9 is in the loading position directly below the storage shaft 51 and a first mandrel 2 is just being pushed through this first ring blank 9. A second ring blank 9, which is mounted around a second mandrel 2, which is at an angular distance of 72 ° from the first mandrel 2, is about to come into contact with the drive roller 1, so it has not yet been rolled.

Um zu der in Fig. 3 dargestellten Situation zu gelangen, wird die Revolvertrommel 3 um ca. 10° im Gegenuhrzeigersinn gedreht. Dabei verbleibt der erste Ringrohling 9 vorerst noch in der Ladeposition direkt unterhalb des Vorratsschachts 51, es ist aber erkennbar, dass sich der erste Dorn 2 um ca. 10° gedreht hat und nun an der linken Innenseite des ersten Ringrohlings 9 anliegt, so dass er diesen bei einem Weiterdrehen mitziehen wird.To get to the in Fig. 3 To get to the situation shown, the revolver drum 3 is rotated by about 10 ° counterclockwise. The first ring blank 9 initially remains in the loading position directly below the storage shaft 51, but it can be seen that the first mandrel 2 has rotated about 10 ° and is now resting on the left inner side of the first ring blank 9 so that it this will drag along with further rotation.

Der zweite Ringrohling 9 ist durch das Drehen der Revolvertrommel 3 aufgrund der Verkleinerung des Walzspalts zwischen dem zweiten Dorn 2 und der Triebwalze 1 mit letzterer in Kontakt gekommen und zu einer geringeren Dicke gewalzt worden. Durch den Kontakt mit der sich vorzugsweise mit konstanter Geschwindigkeit drehenden, durch die Antriebseinrichtung 10 angetriebenen Triebwalze 1 wird auf den Ringrohling 9 ein Drehmoment übertragen, so dass dieser zusammen mit dem drehbar gelagerten zweiten Dorn 2 ins Drehen um die Drehachse des Dorns, das heisst seine Mittelachse, herum gebracht wird. Als besonders vorteilhaft hat sich ein - abhängig von der Grösse des Ringrohlings und der angestrebten Wanddickenreduktion - drei- bis dreissigmaliges, insbesondere acht- bis zwölfmaliges, bevorzugt ca. zehnmaliges, Drehen des Ringrohlings während des Walzens erwiesen. Um dies zu erreichen, werden die Drehgeschwindigkeiten der Triebwalze 1 und der Revolvertrommel 3 geeignet gewählt. Das mehrfache Drehen des Ringrohlings 9 während des Ringwalzens ermöglicht eine grössere Dickenreduktion und ein gleichmässigeres, materialschonenderes Walzen.The second ring blank 9 has come into contact with the latter as a result of the rotation of the revolver drum 3 due to the reduction in the roll gap between the second mandrel 2 and the drive roller 1 and has been rolled to a smaller thickness. Through the contact with the drive roller 1, which preferably rotates at constant speed and is driven by the drive device 10, a torque is transmitted to the ring blank 9, so that it, together with the rotatably mounted second mandrel 2, starts rotating about the axis of rotation of the mandrel, i.e. its Central axis, is brought around. Rotating the ring blank three to thirty times, in particular eight to twelve times, preferably about ten times, during rolling has proven to be particularly advantageous, depending on the size of the ring blank and the desired wall thickness reduction. In order to achieve this, the rotational speeds of the drive roller 1 and the revolver drum 3 are selected appropriately. The multiple turning of the ring blank 9 during the ring rolling enables a greater reduction in thickness and a more even, more material-friendly rolling.

In den Fig. 4 und 5 ist die Dornverstelleinrichtung 4 detaillierter dargestellt. Wie bereits weiter oben beschrieben, umfasst die Dornverstelleinrichtung 4 zwei separate, am Maschinenrahmen 8 befestigte Verstellzylinder 41 und 42. Der Verstellzylinder 41 umfasst einen ausfahrbaren Kolben 411, an dem ein Stosskopf 412 befestigt ist. Der Stosskopf 412 stösst bei der in Fig. 4 dargestellten Situation gegen einen Kopf 21 des Dorns 2 und somit beim Ausfahren des Kolbens 411 den Dorn 2 in Dornlängsrichtung in die Revolvertrommel 3 hinein, wo er durch einen sich in der Ladeposition befindlichen Ringrohling 9 gesteckt wird.In the Figures 4 and 5 the mandrel adjusting device 4 is shown in more detail. As already described above, the mandrel adjusting device 4 comprises two separate adjusting cylinders 41 and 42 fastened to the machine frame 8. The adjusting cylinder 41 comprises an extendable piston 411 to which a pusher head 412 is fastened. The pushing head 412 hits the in Fig. 4 shown situation against a head 21 of the mandrel 2 and thus when the piston 411 is extended, the mandrel 2 in the mandrel longitudinal direction into the revolver drum 3, where it is inserted through a ring blank 9 located in the loading position.

Der Verstellzylinder 42 umfasst einen ausfahrbaren Kolben 421, an dem ein Hintergreifkopf 422 befestigt ist. Der Hintergreifkopf 422 hintergreift bei den in den Fig. 4 und 5 dargestellten Situationen den Dornkopf 21 eines weiteren Dorns 2 und zieht somit beim Einfahren des Kolbens 411 diesen Dorn 2 in Dornlängsrichtung aus der Revolvertrommel 3 und damit auch aus dem in dieser Revolvertrommelposition fertig gewalzten Ring 90 heraus. In Fig. 4 befindet sich der Dorn 2 noch in der Ausgansposition in der Revolvertrommel 3, während er in Fig. 5 teilweise aus der Revolvertrommel 3 herausgefahren ist. Das Hintergreifen des Dornkopfs 21 durch den Hintergreifkopf 422 erfolgt durch das Drehen der Revolvertrommel 3, wodurch der Dornkopf 21 über ein Hintergreifteil 4220 des Hintergreifkopfs 422 geschoben wird. Dieses Hintergreifteil 4220 ist an besten in Fig. 6 erkennbar.The adjusting cylinder 42 comprises an extendable piston 421 to which a gripping head 422 is attached. The gripping head 422 engages behind in the Figures 4 and 5 situations shown, the mandrel head 21 of a further mandrel 2 and thus pulls this mandrel 2 in the mandrel longitudinal direction out of the revolver drum 3 and thus also out of the completely rolled ring 90 in this revolver drum position. In Fig. 4 the mandrel 2 is still in the starting position in the revolver drum 3, while it is in Fig. 5 has partially moved out of the revolver drum 3. The rear engaging head 422 engages behind the mandrel head 21 by rotating the turret drum 3, as a result of which the mandrel head 21 is pushed over a rear engaging part 4220 of the rear engaging head 422. This rear engagement part 4220 is best in Fig. 6 recognizable.

Damit der Dorn 2 beim Drehen der Revolvertrommel 3 in Gegenuhrzeigerrichtung nicht unbeabsichtigt wieder aus der Revolvertrommel 3 herausbewegt wird, weist die Ringwalzvorrichtung einen Niederhalter 40 auf, der flanschartig um ein am Maschinenrahmen 8 befestigtes Montagerohr 81 befestigt ist. Dieser Niederhalter 40 bildet einen Anschlag für den Dornkopf 21, wie am besten aus Fig. 5 ersichtlich.So that the mandrel 2 is not unintentionally moved out of the turret drum 3 when the revolver drum 3 is rotated counterclockwise, the ring rolling device has a hold-down device 40 which is fastened in a flange-like manner around a mounting tube 81 attached to the machine frame 8. This hold-down 40 forms a stop for the mandrel head 21, as best Fig. 5 evident.

Aus Fig. 6 ist ersichtlich, dass die Revolvertrommel 3 beim dargestellten Ausführungsbeispiel zwei voneinander beabstandete, über eine Welle 33 (siehe Fig. 2) drehstarr miteinander verbundene, scheibenartige Trommelteile 31 und 32 umfasst, in denen je ein Teil des Dorns 2 drehbar gelagert ist, so dass ein Mittelteil des Dorns 2, um den ein Ringrohling 9 gelagert ist, zwischen den beiden scheibenartigen Trommelteilen 31, 32 freiliegt. Zwischen den beiden scheibenartigen Trommelteilen 31, 32 ist ein Abstandsring 34 angeordnet, der den gegenseitigen Abstand festlegt. Im Trommelteil 32 sind fünf in einem Winkelabstand von 72° angeordnete Dorndurchgänge 323 für die Dorne 2 vorhanden.Out Fig. 6 it can be seen that the revolver drum 3 in the illustrated embodiment is two spaced apart via a shaft 33 (see Fig. 2 ) rotatably interconnected, disk-like drum parts 31 and 32, in each of which a part of the mandrel 2 is rotatably mounted, so that a central part of the mandrel 2, around which a ring blank 9 is mounted, is exposed between the two disk-like drum parts 31, 32. A spacer ring 34 is arranged between the two disk-like drum parts 31, 32 and defines the mutual distance. In the drum part 32 there are five mandrel passages 323 for the mandrels 2, which are arranged at an angular distance of 72 °.

Zur drehbaren Lagerung der Dorne 2 umfassen die beiden scheibenartigen Trommelteile 31, 32 jeweils pro Dorn 2 je mindestens zwei drehbar gelagerte Stützrollen 311, 312 bzw. 321, 322. Diese Stützrollen 311, 312, 321, 322 stützen den jeweiligen Dorn 2 in Richtung zur Revolvertrommeldrehachse 39 hin ab, so dass der Dorn 2 sich während des Walzens zwischen den Stützrollen 311, 312, 321, 322 und der Triebwalze 1 befindet.For the rotatable mounting of the mandrels 2, the two disc-like drum parts 31, 32 each comprise at least two rotatably mounted support rollers 311, 312 or 321, 322 per mandrel 2. These support rollers 311, 312, 321, 322 support the respective mandrel 2 in the direction of Turret drum rotation axis 39 down so that the mandrel 2 is located between the support rollers 311, 312, 321, 322 and the drive roller 1 during rolling.

Fig. 7 zeigt eine Schnittansicht eines Dorns 2 mit Dornkopf 21, der von zwei Stützrollen 321, 322 gestützt wird. Es ist ersichtlich, dass die Stützrollen 321, 322, wie auch die hier nicht dargestellten Stützrollen 311, 312, als Wälzlager ausgebildet sind, mit Innenrollen 3212 bzw. 3222 und Aussenrollen 3211 bzw. 3221. Fig. 7 shows a sectional view of a mandrel 2 with mandrel head 21, which is supported by two support rollers 321, 322. It can be seen that the support rollers 321, 322, as well as the support rollers 311, 312 not shown here, are designed as roller bearings, with inner rollers 3212 and 3222 and outer rollers 3211 and 3221, respectively.

Die Fig. 8 bis 10 zeigen ein zweites Ausführungsbeispiel der Ringwalzvorrichtung, bei dem jeweils vier Stützrollen einen Dorn abstützen.The Figures 8-10 show a second embodiment of the ring rolling device, in which four support rollers each support a mandrel.

Fig. 8 ist eine Perspektivansicht von vier Stützrollen 611, 612, 621, 622, die einen Dorn 2 abstützen, auf dem ein Ringrohling 9 angeordnet ist. Jede Stützrolle 611, 612, 621, 622 umfasst einen äusseren Lagerteil 6110, 6120, 6210, 6220, welcher fest mit der Revolvertrommel verbunden wird, und eine darin drehbar angeordnete Innenrolle 6111, 6121, 6211, 6221, die an ihrem der gegenüberliegenden Stützrolle zugewandten Ende mit einem Stützflansch 6112, 6122, 6212, 6222 zur Abstützung des Dorns 2 versehen sind. Es ist ersichtlich, dass die Stützflansche 6112, 6122, 6212, 6222 als seitliche Führungen für den Ringrohling 9 dienen. Fig. 8 is a perspective view of four support rollers 611, 612, 621, 622 which support a mandrel 2 on which a ring blank 9 is arranged. Each support roller 611, 612, 621, 622 comprises an outer bearing part 6110, 6120, 6210, 6220, which is firmly connected to the revolver drum, and an inner roller 6111, 6121, 6211, 6221 which is rotatably arranged therein and which faces the opposite support roller End with a support flange 6112, 6122, 6212, 6222 for supporting the mandrel 2 are provided. It can be seen that the support flanges 6112, 6122, 6212, 6222 serve as lateral guides for the ring blank 9.

In Fig. 9 und 10 sind die Stützrollen 611, 612, 621, 622 sowie weitere Stützrollen 661 und 662 in einer Revolvertrommel 603 angeordnet, wobei Fig. 10 einen Schnitt gemäss der Linie F-F in Fig. 9 zeigt. Die Revolvertrommel 603 umfasst zwei voneinander beabstandete, drehstarr miteinander verbundene, scheibenartige Trommelteile 631, 632, in denen jeweils ein Teil jedes Dorns 2 drehbar gelagert ist.In Figures 9 and 10 the support rollers 611, 612, 621, 622 and further support rollers 661 and 662 are arranged in a turret drum 603, wherein Fig. 10 a section along the line FF in Fig. 9 shows. The revolver drum 603 comprises two disk-like drum parts 631, 632 which are spaced apart from one another and are rigidly connected to one another in a rotationally rigid manner, in each of which a part of each mandrel 2 is rotatably mounted.

Dem unteren Teil von Fig. 10 kann entnommen werden, dass die Stützrollen 661, 662 jeweils einen äusseren Lagerteil 6610, 6620 aufweisen, welcher fest mit dem Trommelteil 631 bzw. 632 verbunden ist. Im Innern der äusseren Lagerteile 6610, 6620 sind Innenrollen 6611, 6621 wälzlagerartig drehbar angeordnet. Die Innenrollen 6611, 6621 sind an ihrem der gegenüberliegenden Stützrolle zugewandten Ende mit Stützflanschen 6612, 6622 versehen.The lower part of Fig. 10 it can be seen that the support rollers 661, 662 each have an outer bearing part 6610, 6620 which is firmly connected to the drum part 631 and 632, respectively. Inside the outer bearing parts 6610, 6620, inner rollers 6611, 6621 are rotatably arranged like roller bearings. The inner rollers 6611, 6621 are provided with support flanges 6612, 6622 at their end facing the opposite support roller.

Aus dem oberen Teil von Fig. 10 ist ersichtlich, wie der Dorn 2 von den Stützflanschen 6112 und 6212 abgestützt wird. Im Trommelteil 631 ist ein Anschlag 636 für das eine Ende des Dorns 2 angeordnet.From the upper part of Fig. 10 it can be seen how the mandrel 2 is supported by the support flanges 6112 and 6212. A stop 636 for one end of the mandrel 2 is arranged in the drum part 631.

In den Fig. 11 und 12 ist ein drittes Ausführungsbeispiel einer drehbaren Lagerung eines Dorns 702 in einer Revolvertrommel 703 dargestellt. Die Revolvertrommel 703 umfasst zwei voneinander beabstandete, über eine Welle 733 drehstarr miteinander verbundene, scheibenartige Trommelteile 731 und 732. Im Trommelteil 731 ist ein Anschlag 736 für das eine Ende des Dorns 702 über ein Wälzlager 734 drehbar gelagert. Der Anschlag 736 weist eine innenkonische Anschlagsfläche 7360 auf, an der das konisch ausgebildete eine Ende des Dorns 702 bei vollständig in die Revolvertrommel 703 eingefahrenem Dorn 702 anliegt (siehe Fig. 12). Der Anschlag 736 positioniert den Dorn 702 sowohl in Längsrichtung als auch seitlich.In the Figures 11 and 12 a third embodiment of a rotatable mounting of a mandrel 702 in a revolver drum 703 is shown. The revolver drum 703 comprises two disk-like drum parts 731 and 732, which are spaced apart from one another and are rigidly connected to one another via a shaft 733. The stop 736 has an internally conical stop surface 7360, against which the conically shaped one end of the mandrel 702 rests when the mandrel 702 is completely retracted into the revolver drum 703 (see FIG Fig. 12 ). The stop 736 positions the mandrel 702 both longitudinally and laterally.

Das Trommelteil 732 umfasst eine Führungsbuchse 737, in der eine rohrförmige Dornhalterung 738 in Dornlängsrichtung verstellbar geführt ist. In der Dornhalterung 738 ist das dem konischen Ende abgewandte Ende des Dorns 702 über ein Wälzlager 735 drehbar gehalten. Über die Dornhalterung 738 kann der Dorn 702 von der in Fig. 11 dargestellten herausgezogenen Position in die in Fig. 12 dargestellte eingefahrene Position und umgekehrt verstellt werden.The drum part 732 comprises a guide bushing 737 in which a tubular mandrel holder 738 is adjustably guided in the longitudinal direction of the mandrel. The end of the mandrel 702 facing away from the conical end is rotatably held in the mandrel holder 738 via a roller bearing 735. The mandrel 702 can be removed from the in Fig. 11 extended position shown in Fig. 12 The retracted position shown and vice versa can be adjusted.

Der Vorteil dieser Art von Dornlagerung besteht darin, dass der Dorn 702 durch den Anschlag 736 sowohl in Längsrichtung als auch seitlich exakt positioniert ist. Dies ist insbesondere dann von Bedeutung, wenn die Walzfläche 11 der Triebwalze 1 und/oder der den Ringrohling 9 tragende Mittelteil des Dorns 702 profiliert ist und der gewalzte Ring ein bestimmtes Profil aufweisen soll. Im vorliegenden Fall weist der Dorn 702 eine Ringwulst 720 auf, aufgrund welcher der Ringrohling 9 beim Ringwalzen mit einer Ringnut versehen wird. Dank dem Anschlag 736 wird diese Ringnut an der richtigen Stelle des Ringrohlings 9 erzeugt.The advantage of this type of mandrel mounting is that the mandrel 702 is precisely positioned both in the longitudinal direction and laterally by the stop 736. This is particularly important when the rolling surface 11 of the drive roller 1 and / or the central part of the mandrel 702 carrying the ring blank 9 is profiled and the rolled ring is to have a specific profile. In the present case, the mandrel 702 has an annular bead 720, on the basis of which the ring blank 9 is provided with an annular groove during ring rolling. Thanks to the stop 736, this annular groove is produced at the correct point on the annular blank 9.

Abgesehen von der Revolvertrommel 703 und dem Dorn 702 können die übrigen Bestandteile der Ringwalzvorrichtung gemäss diesem dritten Ausführungsbeispiel im Wesentlichen wie zuvor im Zusammenhang mit dem ersten Ausführungsbeispiel beschrieben ausgebildet sein. Anstatt direkt am Dorn greift die Dornverstelleinrichtung 4 einfach an der Dornhalterung 738 an.Apart from the revolver drum 703 and the mandrel 702, the other components of the ring rolling device according to this third exemplary embodiment can be designed essentially as described above in connection with the first exemplary embodiment. The mandrel adjustment device 4 simply engages the mandrel holder 738 instead of directly on the mandrel.

Fig. 13 zeigt ein viertes Ausführungsbeispiel einer drehbaren Lagerung eines Dorns 802 in einer Revolvertrommel 803. Die Revolvertrommel 803 umfasst zwei voneinander beabstandete, über eine nicht dargestellte Welle drehstarr miteinander verbundene, scheibenartige Trommelteile 831 und 832. Im Trommelteil 831 ist ein Längsanschlag 836 für das eine Ende des Dorns 802 fix verankert. Die Seitenführung für dieses Ende des Dorns 802 erfolgt mittels eines mit einem Durchgang für den Dorn 802 versehenen, angewinkelten Seitenführungselements 837. Fig. 13 shows a fourth embodiment of a rotatable mounting of a mandrel 802 in a revolver drum 803. The revolver drum 803 comprises two spaced apart, rotatably connected to each other via a shaft, not shown, disc-like drum parts 831 and 832 Dorns 802 firmly anchored. The lateral guidance for this end of the mandrel 802 takes place by means of an angled lateral guide element 837 which is provided with a passage for the mandrel 802.

Das Trommelteil 832 umfasst eine Führungsbuchse 838 und ein mit einem Durchgang für den Dorn 802 versehenes, angewinkeltes Seitenführungselement 839.The drum part 832 comprises a guide bushing 838 and an angled lateral guide element 839 provided with a passage for the mandrel 802.

Auch bei dieser Art von Dornlagerung ist der Dorn 802 sowohl in Längsrichtung als auch seitlich exakt positioniert, was wiederum wichtig ist, da der Dorn 802 im vorliegenden Fall eine Ringwulst 820 aufweist, aufgrund welcher der Ringrohling 9 beim Ringwalzen mit einer Ringnut versehen wird.With this type of mandrel support, too, the mandrel 802 is exactly positioned both in the longitudinal direction and laterally, which in turn is important because the mandrel 802 in the present case has an annular bead 820 due to which the ring blank 9 is provided with an annular groove during ring rolling.

Abgesehen von der Revolvertrommel 803 und dem Dorn 802 können die übrigen Bestandteile der Ringwalzvorrichtung gemäss diesem vierten Ausführungsbeispiel im Wesentlichen wie zuvor im Zusammenhang mit dem ersten Ausführungsbeispiel beschrieben ausgebildet sein.Apart from the revolver drum 803 and the mandrel 802, the other components of the ring rolling device according to this fourth exemplary embodiment can essentially be designed as described above in connection with the first exemplary embodiment.

Fig. 14 zeigt ein beispielhaftes Weg-Zeit-Diagramm und Fig. 15 ein korrespondierendes beispielhaftes Drehmoment-Zeit-Diagramm der Drehung der Revolvertrommel einer erfindungsgemässen Ringwalzvorrichtung. Fig. 14 shows an exemplary path-time diagram and Fig. 15 a corresponding exemplary torque-time diagram of the rotation of the revolver drum of a ring rolling device according to the invention.

Den beiden Diagrammen kann entnommen werden, dass die Revolvertrommel zunächst eine gewisse Zeit lang still steht. Während dieser Zeit befindet sich ein Ringrohling 9 in der Ladeposition und es wird ein Dorn durch den Ringrohling 9 durchgesteckt und bis zu einem allfälligen Anschlag in die Revolvertrommel eingefahren. Die Revolvertrommel 3 wird dann in Drehung versetzt und der genannte Dorn mit dem darum herum gelagerten Ringrohling 9 zur Triebwalze 1 hin gedreht. Dies erfordert zunächst ein schnell ansteigendes Anfangsdrehmoment, das dann abnimmt und sogar negativ wird, bis der Ringrohling 9 grob vor der Triebwalze 1 vorpositioniert ist. Während dieser Zeit dreht sich die Revolvertrommel um einen relativ grossen Drehwinkel von ca. 60°. Es erfolgt dann eine genaue Positionierung des Ringrohlings 9 mit zunächst wieder steigendem und dann sinkendem Drehmoment, die deutlich langsamer vorgenommen wird, das heisst die Drehgeschwindigkeit der Revolvertrommel ist deutlich kleiner. Sobald der Ringrohling 9 dann im Walzspalt an der Triebwalze 1 anschlägt und das eigentliche Ringwalzen beginnt, steigt das benötigte Drehmoment in sehr kurzer Zeit rapide an. Während des eigentlichen Ringwalzens nimmt das Drehmoment wieder kontinuierlich bis auf 0 ab. Danach beginnt ein neuer Zyklus.It can be seen from the two diagrams that the revolver drum initially stands still for a certain period of time. During this time, a ring blank 9 is in the loading position and a mandrel is pushed through the ring blank 9 and moved into the revolver drum up to a possible stop. The revolving drum 3 is then set in rotation and the said mandrel with the ring blank 9 mounted around it is rotated towards the drive roller 1. This initially requires a rapidly increasing initial torque, which then decreases and even becomes negative until the ring blank 9 is roughly prepositioned in front of the drive roller 1. During this time, the revolver drum rotates through a relatively large angle of rotation of approx. 60 °. The ring blank 9 is then precisely positioned with initially increasing and then decreasing torque, which is carried out significantly more slowly, that is to say the rotational speed of the revolver drum is significantly lower. As soon as the ring blank 9 then strikes the drive roller 1 in the roll gap and the actual ring rolling begins, the required torque increases rapidly in a very short time. During the actual ring rolling, the torque decreases continuously to 0 again. Then a new cycle begins.

Zu den vorbeschriebenen Ringwalzvorrichtungen sind weitere Variationen realisierbar und alle genannten Vorrichtungsmerkmale sind grundsätzlich frei kombinierbar, solange dem technisch nichts entgegensteht.Further variations of the ring rolling devices described above can be implemented and all of the device features mentioned can in principle be freely combined, as long as there is nothing to the contrary from a technical point of view.

Beispielsweise können bei grösseren Ringrohlingen und entsprechend dicken Dornen diese nur einseitig gelagert werden.For example, in the case of larger ring blanks and correspondingly thick mandrels, these can only be stored on one side.

Das Zuführen der Ringrohlinge zur Revolvertrommel kann alternativ auch über schwenkbare oder über in einer Förderkette gelagerte Dorne erfolgen.The feeding of the ring blanks to the revolver drum can alternatively also take place via pivotable mandrels or via mandrels mounted in a conveyor chain.

Claims (13)

  1. Ring rolling device for enlarging a ring blank (9), with a press element (1), a rotatably mounted mandrel (2; 702; 802) around which the ring blank (9) can be mounted, and a rotatable revolver drum (3; 603; 703; 803), in which the mandrel (2; 702; 802) is rotatably mounted, wherein the mandrel (2; 702; 802) can be moved toward and away from the press element (1) by rotating the revolver drum (3; 603; 703; 803), wherein the revolver drum (3; 603; 703; 803) is disposed relative to the press element (1) such that, by rotating the revolver drum (3; 603; 703; 803), a decreasing roll gap is formed between the mandrel (2; 702; 802) and the press element (1), in which the ring blank (9) is rolled during rotation of the revolver drum (3; 603; 703; 803), characterized in that the revolver drum (3; 603; 703; 803) comprises at least two rotatably mounted support rollers (311, 312, 321, 322; 611, 612, 621, 622, 661, 662) for the rotatable mounting of the mandrel (2; 702; 802), which support the mandrel (2; 702; 802) in the direction of the rotation axis (39) of the revolver drum, so that the mandrel (2; 702; 802) is situated between the support rollers (311, 312, 321, 322; 611, 612, 621, 622, 661, 662) and the press element (1) during the rolling process.
  2. Ring rolling device according to Claim 1, characterized in that the revolver drum (3; 603; 703; 803) comprises two spaced, disc-like drum parts (31, 32; 631, 632; 731, 732; 831, 832), which are torsionally rigidly connected to one another and in each of which a part of the mandrel (2; 702; 802) is rotatably mounted, so that a middle part of the mandrel (2; 702; 802) between the two disc-like drum parts (31, 32; 631, 632; 731, 732; 831, 832) is exposed for mounting a ring blank (9).
  3. Ring rolling device according to Claim 2, characterized in that, for the rotatable mounting of the mandrel (2), the disc-like drum parts (31, 32; 631, 632) each comprise at least two rotatably mounted support rollers (311, 312, 321, 322; 611, 612, 621, 622, 661, 662), which support the mandrel (2) in the direction of the rotation axis (39) of the revolver drum, so that the mandrel (2; 702; 802) is situated between the support rollers (311, 312, 321, 322; 611, 612, 621 , 622, 661, 662) and the press element (1) during the rolling process.
  4. Ring rolling device according to one of Claims 1 to 3, characterized in that each support roller (611, 612, 621, 622, 661, 662) comprises a support flange (6112, 6122, 6212, 6222, 6612, 6622) for supporting the mandrel (2; 702; 802).
  5. Ring rolling device according to Claim 4, characterized in that the support flanges (6112, 6122, 6212, 6222, 6612, 6622) are respectively disposed at one end of the support rollers (611, 612, 621, 622, 661, 662) and serve as lateral guides for the ring blank (9).
  6. Ring rolling device according to one of Claims 1 to 5, characterized in that the mandrel (702) in the revolver drum (703) is rotatably mounted in at least one rolling bearing (734, 735).
  7. Ring rolling device according to Claim 1, characterized in that the mandrel is only mounted on one side.
  8. Ring rolling device according to one of Claims 1 to 7, characterized in that the revolver drum (3; 603; 703; 803) comprises a stop (636; 736; 836) for positioning the mandrel (2; 702; 802) in the longitudinal direction of the mandrel (2; 702; 802).
  9. Ring rolling device according to one of Claims 1 to 8, characterized in that it comprises a mandrel adjuster (4) for adjusting the mandrel (2; 702; 802) in the longitudinal direction of the mandrel (2; 702; 802).
  10. Ring rolling device according to one of Claims 1 to 9, characterized in that it comprises a ring blank feed mechanism (5), with which ring blanks (9) can be fed individually to a location in which the mandrel (2; 702; 802) can be pushed through the fed ring blank (9).
  11. Ring rolling device according to one of Claims 1 to 10, characterized in that a plurality of mandrels (2; 702; 802) are rotatably mounted in the revolver drum (3; 603; 703; 803) .
  12. Ring rolling device according to one of Claims 1 to 11, characterized in that it comprises a drive mechanism (10) for driving the press element (1), so that the ring blank (9) can be rotated by the movement of the press element (1) during the rolling process.
  13. Ring rolling device according to one of Claims 1 to 12, characterized in that the press element is a rotatably mounted drive roller (1).
EP14706598.1A 2014-02-25 2014-02-25 Ring rolling device Active EP3110577B2 (en)

Applications Claiming Priority (1)

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PCT/EP2014/053655 WO2015127964A1 (en) 2014-02-25 2014-02-25 Ring rolling device

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EP3110577A1 EP3110577A1 (en) 2017-01-04
EP3110577B1 EP3110577B1 (en) 2018-03-28
EP3110577B2 true EP3110577B2 (en) 2021-03-03

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EP (1) EP3110577B2 (en)
JP (1) JP6373412B2 (en)
KR (1) KR101905287B1 (en)
CN (1) CN105980083B (en)
EA (1) EA031166B1 (en)
ES (1) ES2667421T5 (en)
UA (1) UA114688C2 (en)
WO (1) WO2015127964A1 (en)

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US10369609B2 (en) * 2014-08-29 2019-08-06 Victaulic Company Roller with compound angle flange
CN104226868B (en) * 2014-09-24 2017-01-11 武汉理工大学 Valve body composite rolling ring forming method for ball valve
EP3375541A1 (en) 2017-03-14 2018-09-19 Forge Pat GmbH Multi-mandrel rolling mill, method for adjusting the position of the mandrels of such a rolling mill and continuous rolling method using such a rolling mill
CN107263119A (en) * 2017-07-25 2017-10-20 浙江赛赛轴承有限公司 A kind of bearing machining automatic production line
CN109483154A (en) * 2017-09-11 2019-03-19 江苏天南电力器材有限公司 A kind of production technology and equipments of U-shaped ring
KR102149757B1 (en) 2018-10-31 2020-08-31 최원중 High precision hot rolling machine for preventing forming ring core burr by hydraulic automatic operation
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EA201600611A1 (en) 2016-12-30
US20170008066A1 (en) 2017-01-12
ES2667421T5 (en) 2021-10-06
EP3110577B1 (en) 2018-03-28
JP6373412B2 (en) 2018-08-15
CN105980083A (en) 2016-09-28
EP3110577A1 (en) 2017-01-04
JP2017506162A (en) 2017-03-02
KR20160125408A (en) 2016-10-31
CN105980083B (en) 2017-12-05
WO2015127964A1 (en) 2015-09-03
UA114688C2 (en) 2017-07-10
US10413963B2 (en) 2019-09-17
ES2667421T3 (en) 2018-05-10
KR101905287B1 (en) 2018-10-05
EA031166B1 (en) 2018-11-30

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