EP3110577B1 - Ring rolling device - Google Patents

Description

The present invention relates to a ring rolling apparatus according to the preamble of independent claim 1.

A known variant for producing rings, for example for ball bearings, is first to forge 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 roll. The thickness of the ring blank is reduced and at the same time its circumference is increased, since no material is removed. To reduce the thickness of the ring blank, the nip between the mandrel and the forming roll must be continuously reduced, which can be done for example by a displacement of the mandrel to form the forming or vice versa.

At one in the US 4 173 877 A disclosed ring rolling apparatus, the forming roller is formed so that its radius increases continuously, starting from a start zone against the rolling direction. During rolling by rotating the forming roll, a constant reduction of the roll gap occurs at a constant spacing of the mandrel, whereby the ring blank is rolled to a smaller thickness. In this ring rolling four mandrels are mounted on a turntable, so that by rotating the turntable by 90 ° each of the next mandrel is rotated with the next previously arranged around it ring blank for forming roll back into the rolling position. This rotation is done exactly when the turntable faces the start zone of the forming roll where the ring blank is not yet in contact with the forming roll. The rolling of the ring blank is only then by turning the forming roller, while the turntable is no longer rotating.

A disadvantage of this ring rolling device is that it requires a specially shaped forming roll. In addition, the rolling of the ring blank must be carried out during exactly one revolution of the forming roll and the next ring blank must be brought into the rolling position at exactly the right time by a coordinated rotation of the turntable.

In the generic DE 703 436 C discloses a ring rolling apparatus comprising a roller as a pressing member and a turntable with a plurality of rotatably mounted thorns around which are mounted to be rolled ring blanks. By turning the turntable, the mandrels are movable towards the pressing element every now and then. In this case, a shrinking roll gap is formed between the mandrel and the pressing element, in which the ring blank is rolled. The mandrels in each case engage in a conical bore in a mandrel-roll pin rotatably mounted in the turntable and are fixedly connected at the top with a second mandrel-roll pin.

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 the operation.

The present invention is therefore an object of the invention to provide a ring rolling device of the type mentioned, which allows a fast and accurate feeding and rolling of ring blanks.

This object is achieved by the inventive ring rolling device, as defined in independent claim 1. Particularly advantageous embodiments of the invention will become apparent from the dependent claims.

The essence of the invention consists in the following: A ring rolling device for expanding a ring blank comprises a pressing element, a rotatably mounted mandrel, around which the ring blank is storable, and a rotatable revolver drum in which the mandrel is rotatably mounted. By turning the revolver drum, the mandrel is movable towards the pressing element from time to time. The turret drum is arranged relative to the pressing member so that by rotating the turret drum between the mandrel and the pressing member, a decreasing rolling gap is formed, in which the ring blank is rolled during rotation of the turret drum. According to the invention, the revolver drum for rotatably supporting the mandrel has at least two rotatably mounted support rollers which support the mandrel in the direction of the revolver rotating axis, so that the mandrel is located between the support rollers and the pressing element during rolling.

The inventive ring rolling device has the advantage that both the feeding of the ring blank in the rolling position and the rolling of the ring blank by the revolver drum is rotated towards the pressing element. By this rotation, first a roll gap is formed and the ring blank is brought into contact with the pressing element and then the rolling gap is reduced, whereby the ring blank is rolled between the mandrel and the pressing element, that is, the wall thickness of the ring blank is reduced.

The at least two rotatably mounted support rollers enable support of the mandrel during rolling to accommodate the rolling forces over a desired mandrel length and rotation of the mandrel during rolling about its mandrel axis of rotation. 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 and the revolver rotating axis and, if the pressing member is a drive roller whose axis of rotation are preferably parallel, but this is not essential.

Preferably, in the ring rolling apparatus according to the invention, the turret drum comprises two spaced apart, rotationally rigidly interconnected, disc-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 disc-like drum parts for supporting a ring blank. By the two rotatably connected to each other, disc-like drum parts of the mandrel can be stably and rotatably mounted on both sides of the ring blank supporting middle part.

In an advantageous embodiment variant, the disk-like drum parts for rotatably supporting the mandrel each have at least two rotatably mounted support rollers which support the mandrel in the direction of the revolver rotation axis, so that the mandrel is located between the support rollers and the pressing element during rolling. The at least two support rollers allow a support of the mandrel on both sides of the central part for receiving the rolling forces over a desired mandrel length and a rotation of the mandrel during rolling about its mandrel rotation axis.

Advantageously, each support roller has a support flange for supporting the mandrel. The mandrel is then only on the support flanges, allowing for easier placement.

Preferably, the support flanges are 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.

In a further advantageous embodiment, the mandrel is rotatably mounted in the revolver drum in at least one rolling bearing. Rolling bearings also provide good support of the mandrel for receiving rolling forces over a desired mandrel length and rotation of the mandrel during rolling about its mandrel axis of rotation.

Rolling and support rollers can also be combined. In particular, it is possible to provide a roller bearing on one side of the mandrel and support rollers on the other side.

Preferably, the revolver drum has a stop for positioning the mandrel in the longitudinal direction of the mandrel. This allows accurate positioning of the mandrel and the ring blank thereon for rolling and is particularly important if the mandrel and / or the pressing element has a profiling to be transmitted to the ring blank.

Advantageously, the inventive ring rolling device on a Dornverstelleinrichtung for adjusting the mandrel in the longitudinal direction of the mandrel. This makes it possible, by retracting the mandrel, feeding a ring blank into a loading position and again pushing the mandrel and pushing through the mandrel through the present in the loading position ring blank this ring blank in a simple manner around the mandrel around or store. Conversely, with the same or a further mandrel adjustment device, the finished rolled ring can be removed again by withdrawing the mandrel from the mandrel.

The ring rolling device according to the invention preferably has a ring blank feed device with which ring blanks can be supplied individually to a point at which the mandrel can be pushed through the supplied ring blank, that is to say the loading position mentioned above. This allows together with the Dornverstelleinrichtung in a simple way, the storage or placing a ring blank around the mandrel.

Advantageously, several mandrels are rotatably mounted in the revolver drum. As a result, different methods can run simultaneously at different stations. For example, a ring blank may be stored around a mandrel at a first station, a ring blank rolled at a second station, and a ring blank removed from a mandrel at a third station. The rolling throughput can be increased significantly, that is, in a shorter time more ring blanks can be rolled into rings.

Due to the higher rolling throughput ring rolling is possible in the cycle of producing ring blanks and the ring rolling device can be attached, for example, to a cold or hot forming machine. When attached to a hot forming machine, the advantage can be exploited so that the still warm ring blanks produced by the hot forming machine can be rolled directly with the ring rolling device. An additional warming of the ring blanks can be omitted for a hot ring rolling. In principle, however, a preliminary warming of the ring blanks before ring rolling is possible and inventive ring rolling devices can be used both for a hot ring rolling and a cold ring rolling.

During hot ring rolling, cooling of the components of the rolling device, such as, for example, mandrel, pressing element, drive roller, etc., may optionally be provided.

Preferably, the inventive ring rolling device has a drive device for driving the pressing element, so that the ring blank is rotatable during rolling by the movement of the pressing element. This makes it possible to rotate the ring blank on the rotatably mounted mandrel by means of the pressing member during rolling several times, wherein the ring blank is rolled to a smaller thickness with each rotation. In this way, a greater reduction in thickness and a more uniform, material-sparing rolling can be achieved. Particularly advantageous is a - depending on the size of the ring blank and the desired wall thickness reduction - three to thirty times, in particular eight to twelve times, turning of the ring blank during rolling proven.

Advantageously, the pressing element is a rotatably mounted drive roller. Such a drive roller can, for example, be driven continuously by means of a motor and in turn transmit its rotational movement to the ring blank mounted around the mandrel as soon as it comes into contact with the drive roller. Compared to a linear pressing element, which would also be conceivable in the case of the ring rolling device according to the invention, the turning of the drive roller can take place continuously and at constant speed, and a return of the pressing element after rolling is dispensed with.

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 will be described in more detail with reference to the attached drawings by means of exemplary embodiments. Show it:

Fig. 1 -

a perspective view of an embodiment of an inventive ring rolling device;

Fig. 2 -

a section through the ring rolling device of Fig. 1 just before rolling a ring blank;

Fig. 3 -

a section through the ring rolling device of Fig. 1 analogous Fig. 2 but during rolling of a ring blank;

Fig. 4-6 -

various perspective detail views of parts of the ring rolling device of Fig. 1 ;

Fig. 7 -

a sectional view of a mandrel and two support rollers of the ring rolling device of Fig. 1 ;

Fig. 8 -

a second embodiment of four support rollers which 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 pulled out of a bearing side mandrel;

Fig. 12 -

the mandrel storage of Fig. 11 with both sides rotatably mounted mandrel;

Fig. 13 -

a fourth embodiment of a rotatable mounting of a mandrel;

Fig. 14 -

an exemplary path-time diagram of the rotation of the revolving drum of a ring rolling device according to the invention; and

Fig. 15 -

an exemplary torque-time diagram of the rotation of the revolver drum according to Fig. 14 ,

The following definition applies to the following description: If reference signs have been given in a figure for the purpose of clarity of drawing, but are not mentioned in the directly related part of the description, reference is made to their explanation in the preceding or following parts of the description. Conversely, less relevant reference numerals are not included in all figures to avoid overcharging graphic for the immediate understanding. For this purpose, reference is made to the other figures.

That in the Fig. 1 and 2 illustrated embodiment of an inventive ring rolling device comprises a pressing element as a drive roller 1, which has at its periphery a rolling surface 11 which is bounded on both sides by a collar 12 and 13 respectively. The collars 12 and 13 prevent during the ring rolling a lateral expansion of the ring blank 9, as best of the FIGS. 9 and 10 seen. The drive roller 1 is over a Shaft 14 is rotatably mounted on a bearing plate 15 and is driven by a drive device 10.

The bearing plate 15 is mounted, for example via three rail gripping elements 151, 152 and 153 in the direction of a revolver rotation axis 39 adjustable above and below each of a 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 thereon 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 this purpose, 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.

When ring rolling the ring blank 9 is rolled between the drive roller 1 and a mandrel 2, which is rotatably mounted in a revolving drum 3. Fig. 2 can be seen that in the present revolving drum 3 five mandrels 2 evenly distributed, based on the revolving revolver axis 39 at an angular distance of 72 °, are rotatably mounted. The turret 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.

For feeding ring blanks 9 to the spikes 2 in the revolving drum 3, the ring rolling device shown has a ring blank feed device 5 on. The ring blank feed device 5 is designed to supply ring blanks 9 individually to a point at which a mandrel 2 can be pushed through the supplied ring blank 9, that is to say a loading position. The ring blank feed device 5 has a supply chute 51 in which a plurality of ring blanks 9 can be stored. The storage chute 51 is provided at its lower end with an opening through which passes a ring blank 9 due to gravity directly to the loading position. In order to prevent ring blanks 9 from falling uncontrollably in the direction of the loading position, there is a hinged retaining element 52 which is held in a retaining position by means of a spring element 54 acting on a cam follower 53, in which it holds the ring blanks 9 in the supply shaft 51. In order to release a single ring blank 9, the cam follower 53 is simply acted upon by means of a control cam 55 which is rotatably mounted about the revolver rotating shaft 39 and counter to the spring force.

To store a ring blank 9 around a mandrel 2 and later to be able to remove a rolled ring 90 from the mandrel 2 again, the ring rolling device has a mandrel adjusting device 4 for adjusting the mandrel 2 in the longitudinal direction of the mandrel 2. Since the bearing of the ring blank 9 around the mandrel 2 around and the removal of the rolled ring 90 from the mandrel 2 takes place at two different locations, namely on the one hand directly below the supply chute 51 and on the other hand approximately after a rotation of the revolving drum 3 by about 150 ° the Dornverstelleinrichtung 4 two separate adjusting 41 and 42 which are fixed to the machine frame 8.

For the removal of the rolled ring 90 after removal from the mandrel 2, a discharge channel 6 is arranged below the point of the ring removal in the illustrated ring rolling device.

Fig. 3 corresponds largely Fig. 2 , the only difference is that the revolver drum 3 in Fig. 3 rotated about 10 ° counterclockwise further than in Fig. 2 ,

In Fig. 2 There is a first ring blank 9 in the loading position directly below the supply shaft 51 and it is just a first mandrel 2 pushed through this first ring blank 9. A second ring blank 9, which is mounted around a second mandrel 2, which is located at an angular distance of 72 ° to the first mandrel 2, is close to the contact with the drive roller 1, so has not yet been rolled.

To go to the in Fig. 3 to reach the situation shown, the revolver drum 3 is rotated by about 10 ° in the counterclockwise direction. In this case, the first ring blank 9 remains for the time being in the loading position directly below the supply shaft 51, but it can be seen that the first mandrel 2 has rotated by about 10 ° and now rests against the left inside of the first ring blank 9, so that he will follow this with a further rotation.

The second ring blank 9 has come into contact with the latter due to the rotation of the revolver drum 3 due to the reduction of the nip between the second mandrel 2 and the drive roller 1 and to a rolled smaller thickness. By contact with the preferably constant-speed rotating, driven by the drive means 10 drive roller 1, a torque is transmitted to the ring blank 9, so that this together with the rotatably mounted second mandrel 2 to rotate about the axis of rotation of the mandrel, that is his Center axis, is brought around. Depending on the size of the ring blank and the desired wall thickness reduction, it has proven to be particularly advantageous to rotate the ring blank during rolling three to thirty times, in particular eight to twelve times, preferably approximately ten times. To achieve this, the rotational speeds of the drive roller 1 and the revolver drum 3 are suitably selected. The multiple turning of the ring blank 9 during ring rolling enables a greater reduction in thickness and a more uniform, material-sparing rolling.

In the 4 and 5 the mandrel 4 is shown in more detail. As already described above, the mandrel adjustment device 4 comprises two separate adjustment cylinders 41 and 42 attached to the machine frame 8. The adjustment cylinder 41 comprises an extendible piston 411 to which a push head 412 is attached. The push head 412 pushes at the in Fig. 4 illustrated situation against a head 21 of the mandrel 2 and thus upon extension of the piston 411 the mandrel 2 in the mandrel longitudinal direction in the revolving drum 3 into where it is inserted through a located in the loading position ring blank 9.

The adjusting cylinder 42 comprises an extendible piston 421 to which a rear gripping head 422 is attached. The Hintergreifkopf 422 engages behind in the in the 4 and 5 illustrated situations, the mandrel head 21 of a further mandrel 2 and thus pulls when retracting the piston 411 this mandrel 2 in the mandrel longitudinal direction of the revolving drum 3 and thus out of the finished in this revolver drum position ring 90 out. In Fig. 4 the mandrel 2 is still in the Ausgansposition in the revolving drum 3, while in Fig. 5 partially moved out of the revolving drum 3. The engagement of the mandrel head 21 by the rear gripping head 422 takes place by rotating the revolver drum 3, whereby the mandrel head 21 is pushed over a rear engagement part 4220 of the rear grip head 422. This rear grip part 4220 is best in Fig. 6 recognizable.

Thus, the mandrel 2 is not unintentionally moved out of the revolving drum 3 when turning the revolver drum 3 in the counterclockwise direction, the ring rolling device on a hold-down 40 which is fixed in a flange mounted on a machine frame 8 mounting tube 81. This hold-down 40 forms a stop for the mandrel head 21, as best of Fig. 5 seen.

Out Fig. 6 It can be seen that the revolver drum 3 in the illustrated embodiment, two spaced apart, via a shaft 33 (see Fig. 2 ) rotatably connected to each other, disc-like drum parts 31 and 32 comprises, in each of which a part of the mandrel 2 is rotatably mounted, so that a central part of the mandrel 2 to the a ring blank 9 is mounted, between the two disc-like drum parts 31, 32 exposed. Between the two disc-like drum parts 31, 32, a spacer ring 34 is arranged, which determines the mutual distance. In the drum part 32 five arranged at an angular distance of 72 ° mandrel passages 323 for the mandrels 2 are present.

For rotatably supporting the mandrels 2, the two disk-like drum parts 31, 32 each comprise at least two rotatably mounted support rollers 311, 312 and 321, 322 for each mandrel 2. These support rollers 311, 312, 321, 322 support the respective mandrel 2 in the direction of Revolver rotary pivot axis 39 out so that the mandrel 2 is located during rolling between the support rollers 311, 312, 321, 322 and the drive roller 1.

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 rolling bearings, with inner rollers 3212 and 3222 and outer rollers 3211 and 3221st

The Fig. 8 to 10 show a second embodiment of the ring rolling device, in each case four support rollers 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 fixed to the revolver drum and an inner roller 6111, 6121, 6211, 6221 rotatably disposed therein, which are provided at their opposite the support roller facing end with a support flange 6112, 6122, 6212, 6222 for supporting the mandrel 2. It can be seen that the support flanges 6112, 6122, 6212, 6222 serve as lateral guides for the ring blank 9.

In FIGS. 9 and 10 the support rollers 611, 612, 621, 622 and further support rollers 661 and 662 are arranged in a revolver drum 603, wherein Fig. 10 a section along the line FF in Fig. 9 shows. The revolver drum 603 comprises two spaced apart, rotationally rigidly interconnected, disc-like drum parts 631, 632, in each of which a part of each mandrel 2 is rotatably mounted.

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 fixedly connected to the drum part 631 and 632, respectively. Inside the outer bearing parts 6610, 6620 inner rollers 6611, 6621 are rotatably mounted like a roller bearing. The inner rollers 6611, 6621 are provided with support flanges 6612, 6622 at their end facing the opposite support roller.

From the upper part of Fig. 10 it can be seen how the mandrel 2 is supported by the support flanges 6112 and 6212. In the drum part 631, a stop 636 is arranged for the one end of the mandrel 2.

In the FIGS. 11 and 12 is a third embodiment of a rotatable mounting of a mandrel 702 in one Revolver drum 703 shown. The revolver drum 703 comprises two spaced-apart, disk-like drum parts 731 and 732 connected in a torsionally rigid manner via a shaft 733. In the drum part 731, a stop 736 for the one end of the mandrel 702 is rotatably mounted via a roller bearing 734. The stopper 736 has an inner conical abutment surface 7360 against which the conically formed one end of the mandrel 702 abuts when the mandrel 702 is fully retracted into the revolver drum 703 (see FIG Fig. 12 ). The stopper 736 positions the mandrel 702 both longitudinally and laterally.

The drum part 732 comprises a guide bush 737, in which a tubular mandrel holder 738 is adjustably guided in the mandrel longitudinal direction. In the mandrel holder 738, the end facing away from the conical end of the mandrel 702 is rotatably supported via a rolling bearing 735. About the mandrel holder 738 of the mandrel 702 of the in Fig. 11 shown pulled out position in the in Fig. 12 shown retracted position and vice versa be adjusted.

The advantage of this type of mandrel bearing is that mandrel 702 is accurately positioned by stop 736 both longitudinally and laterally. 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, due to which the ring blank 9 is provided with an annular groove during ring rolling becomes. Thanks to the stop 736, this annular groove is produced at the right place of the ring blank 9.

Apart from the revolver drum 703 and the mandrel 702, the remaining components of the ring rolling device according to this third embodiment may be substantially as described above in connection with the first embodiment. Instead of directly on the mandrel, the mandrel adjusting device 4 simply engages the mandrel holder 738.

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, about a shaft, not shown, rotationally rigidly interconnected disc-like drum parts 831 and 832. In the drum part 831 is a longitudinal stop 836 for the one end of Dorns 802 fix anchored. The side guide for this end of the mandrel 802 is by means of an angled side guide member 837 provided with a passage for the mandrel 802.

The drum member 832 includes a guide bushing 838 and angled side guide member 839 provided with a passageway for the mandrel 802.

Also in this type of mandrel bearing, the mandrel 802 is accurately positioned both longitudinally and laterally, which in turn is important because the mandrel 802 in the present case has an annular bead 820, due to which the annular blank 9 is provided with an annular groove during ring rolling.

Apart from the revolver drum 803 and the mandrel 802, the remaining components of the ring rolling apparatus according to this fourth embodiment may be substantially as described above in connection with the first embodiment.

Fig. 14 shows an exemplary path-time diagram and Fig. 15 a corresponding exemplary torque-time diagram of the rotation of the revolving drum of a ring rolling device according to the invention.

The two diagrams show that the revolver drum initially stands still for a certain time. During this time, a ring blank 9 is in the loading position and it is pushed through a mandrel through the ring blank 9 and retracted to a possible stop in the revolver drum. The revolver drum 3 is then set in rotation and 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 pre-positioned in front of the drive roller 1. During this time, the revolver drum rotates about a relatively large rotation angle of about 60 °. It then takes place an accurate positioning of the ring blank 9 with initially rising again and then decreasing torque, which is made much slower, that is, the rotational speed of the revolver drum is much smaller. As soon as the ring blank 9 then strikes the drive roller 1 in the nip and the actual ring rolling begins, the required torque increases in a very short time Time is fast. During the actual ring rolling, the torque decreases again continuously to 0. After that, a new cycle begins.

To the above-described ring rolling devices further variations are feasible and all device features mentioned are basically freely combinable, as long as the technically nothing precludes.

For example, in larger ring blanks and correspondingly thick thorns they can be stored only on one side.

The feeding of the ring blanks to the revolver drum can alternatively be done via pivotable or mounted in a conveyor chain mandrels.

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 one of Claims 1 to 6, 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).

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