EP3283243A1

EP3283243A1 - Ring rolling device having axially fixed rolling-element bearings

Info

Publication number: EP3283243A1
Application number: EP16717329.3A
Authority: EP
Inventors: Andreas MARITZ; Andreas Matt; Thomas Christoffel
Original assignee: Hatebur Umformmaschinen AG
Current assignee: Hatebur Umformmaschinen AG
Priority date: 2015-04-17
Filing date: 2016-04-13
Publication date: 2018-02-21
Anticipated expiration: 2036-04-13
Also published as: KR102524723B1; EA201700502A1; EA033208B1; ES2702770T3; CN107530762B; US10870144B2; JP6850733B2; CH710982A1; KR20170138445A; TW201700192A; EP3283243B1; JP2018511484A; WO2016166133A1; US20180117663A1; TWI683706B; CN107530762A

Abstract

The invention relates to a ring rolling device for expanding a ring blank (9) comprises a pressing element, a rotatably supported mandrel (2), and an advancing assembly (3), in which a first end part of the mandrel (2) is rotatably supported in a first rolling-element bearing (310) and a second end part of the mandrel is rotatably supported in a second rolling-element bearing (320). The ring blank (9) can be supported around the mandrel (2). By means of the advancing assembly (3), the mandrel (2) can be moved toward the pressing element and away from the pressing element again, wherein a decreasing rolling gap is formed between the mandrel (2) and the pressing element, in which rolling gap the ring blank (9) is rolled. The two rolling-element bearings (310, 320) are arranged in the advancing assembly (3) in an axially fixed manner, and the mandrel (2) is supported in such a way that the mandrel can be moved axially in relation to the two rolling-element bearings (310, 320).

Description

Ring rolling device with axially fixed rolling bearings

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, is first to forge a ring blank, which is then further processed by ring rolling. For ring rolling is the

Ring blank stored 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 increases, 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.

In DE 703 436 C is a ring rolling device

discloses 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 decreasing rolling gap is formed between the mandrel and the pressing element, in which the

Rolled ring blank. 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.

Another ring rolling device for expanding a ring blank is described in CH 706 844 AI. It comprises a pressing element, several rotatably mounted

Mandrels, around each of which a ring blank is storable, and a rotatable revolver drum, in which the mandrels are rotatably mounted. By rotating the revolver drum, the mandrels are movable towards the pressing element from time to time. The revolver drum is relative to

Pressing element arranged so that by turning the

Revolver drum between the respective mandrel and the

Pressing a downsized nip is formed in which the ring blank is rolled during rotation of the revolver drum. For rotatable mounting of the mandrels, the revolver drum per mandrel, for example, two roller bearings and at least two rotatably mounted support rollers, which the mandrel in the direction of

Support turret rotation axis so that the mandrel is between the rollers and the pressing element during rolling. 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 rotation axis, wherein the mandrel rolls on its support rollers.

The ring rolling device according to CH 706 844 AI 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 brought into contact with the pressing element and then the nip

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 allow a support of the mandrel during rolling for receiving the rolling forces over a desired mandrel length and a

Turning the spine during rolling around its

Dorn axis of rotation. That way, a good one

Rolling precision can be achieved. However, a disadvantage of this known ring rolling device is in the condition caused by the many support rollers and their storage

Complexity of the device, which also has a negative impact on the rigidity of the system, and the other, also caused by the support rollers relatively large masses to be moved.

The present invention is therefore based on the object to simplify a ring rolling device of the generic type constructive. It should be the

Achieved achievable rolling precision as possible, moving masses kept as low as possible and the stiffness can be increased as possible.

This object is achieved by the inventive

Ring whale zVorrichtung solved, as in the independent

Claim 1 is defined. Particularly advantageous embodiments of the invention will become apparent from the dependent claims. The essence of the invention consists in the following:

Ring whale zorrichtung for expanding a ring blank comprises a pressing member, a rotatably mounted mandrel having a first end portion, a second end portion and therebetween a central part, around which the ring blank is storable, and a feed arrangement in which the mandrel with its first end portion is rotatably mounted in a first roller bearing and with its second end part in a second rolling bearing, so that the middle part of the mandrel is exposed for supporting the ring blank.

By means of the delivery arrangement is the mandrel for

Pressing element now and then movable away from it, wherein between the mandrel and the pressing element, a decreasing rolling gap is formed, in which the

Rolled ring blank. The second rolling bearing is arranged axially fixed in the Zustellanordnung and the mandrel is axially movably mounted relative to the second rolling bearing, so that the second end portion of the mandrel from the second rolling bearing is pulled out or inserted into this. According to the invention, the first rolling bearing in the feed arrangement is arranged axially fixed and the mandrel is mounted axially movable relative to the first rolling bearing. The pivot bearing of the mandrel in axially fixed bearings is structurally less expensive than the storage on different types of bearings and in addition to support rollers.

In addition, both in the movement of the

Delivery arrangement as well as the insertion of the mandrel through the ring blank and insertion into the second

Rolling or vice versa when pulling out of the mandrel less mass to be moved. The latter is the case because the bearings themselves are axially fixed and only the mandrel itself, that is, in its

Longitudinal, must be moved. This allows a high speed when feeding and ring rolling of ring blanks in the machine cycle.

Preferably, the first and the second rolling bearing are tangentially movable bearings, in particular

Spherical roller bearing or self-aligning ball designed.

Spherical roller bearings and self-aligning ball bearings withstand high radial and axial loads and are well suited to compensate for misalignments. Moreover, they are relatively compact.

Advantageously, in the first and in the second

Rolling bearing axially fixed sleeve-shaped bushes for receiving the mandrel rotatably mounted. The cans

allow easy insertion of the mandrel into the bearings. Preferably, the bushings are tiltable relative to the axis of rotation of the first and the second rolling bearing

arranged, expediently the Verkippbarkeit the bushes is limited by stops. This allows a safe insertion of the mandrel in the rolling bearing or their sleeves.

For easier insertion of the mandrel in the second rolling bearing advantageously has in the second

Rolling arranged bush a funnel-shaped

Insertion bevel. For the same reason is

Advantageously, the mandrel is conical or rounded at its front end at the second end portion. To increase the rolling precision, the feed arrangement in an advantageous embodiment variant

preferably adjustable stop element for the front end of the mandrel 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.

Expediently, the stop element projects partially into the second rolling bearing and is opening out into the interior of the second rolling bearing

Supply line formed for a cleaning and / or coolant. This allows the cans at times when no mandrel stored in them or the mandrel

is at least partially pulled out, cleaned in a simple manner and / or cooled.

Advantageously, the stop element is rotatably mounted. As a result, the wear due to an adjacent, rotating mandrel can be significantly reduced.

In an alternative embodiment variant, the feed arrangement expediently comprises an alternative stop element for a stop collar on the first end part of the mandrel for positioning the mandrel in the latter

Longitudinal direction. Preferably, the alternative stop element is formed by the rotatably mounted in the first bearing sleeve. This training of

Stop element is structurally particularly simple. According to a preferred embodiment, the

Zustellanordnung a rotatable turret drum, wherein the turret drum is arranged relative to the pressing member so that by rotating the turret drum between the mandrel and the pressing member is a decreasing

Rolling gap is formed. The storage of the mandrel on a revolver drum is structurally favorable and allows a high machine cycle.

Preferably, the revolver drum comprises two spaced-apart, torsionally rigidly interconnected,

disc-like drum parts in which the first roller bearing and the second roller bearing for the mandrel are arranged axially fixed. By the two drehstarr interconnected, disc-like drum parts of the mandrel on both sides of the ring blank can be stored

Central part stable and simultaneously rotatable.

Advantageously, the first and the second

Rolling bearings as a whole interchangeable in the

Drum parts mounted. This allows the

Ring rolling device can be quickly and easily converted to another mandrel diameter.

Advantageously, at least the sleeve arranged in the second rolling bearing preferably has an annular groove

trained positive locking element for applying a mounting tool. Thus, the second rolling bearing can be easily removed by means of the tool from the ring rolling device. Advantageously, the ring rolling device has a preferably closed cooling system for the roller bearings and / or infeed arrangement. Advantageously, the inventive

Ringwal zVorrichtung a Dornverstelleinrichtung for adjusting the mandrel in the longitudinal direction of the mandrel on. This allows, 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

to arrange 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.

Preferably, the inventive

Ringwal zVorrichtung a Ringrohlingzuführeinrichtung, with which ring blanks can be fed individually to a point at which the mandrel is pushed through the supplied ring blank, that is, the above-mentioned loading position. This, together with the mandrel adjustment device, makes it easy to store a ring blank around the mandrel.

Advantageously, several mandrels are rotatably mounted in the Zustellanordnung. This can be done simultaneously

different stations run different procedures. For example, at a first station

Ring blank are stored around a mandrel around, a ring blank are rolled at a second station and a ring blank from a mandrel at a third station be removed. 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 roll set a ring rolling to the beat of manufacturing ring blanks is possible and the ring rolling device can for example be attached to a cold or hot-forming machine ^¬. When affiliated with a hot forming machine can be exploited so the advantage that directly from the

Hot forming machine produced, still warm

Ring blanks can be rolled with the ring rolling device. An additional warming of the ring blanks can be omitted for a hot ring rolling. Basically, however, a preliminary warming of the ring blanks before ring rolling is possible and inventive

Ringwal zVorrichtungen can be used both for a hot ring rolling and a cold ring rolling. In hot ring rolling, cooling of the components of the rolling means, such as e.g. Mandrel,

Pressing element, drive roller, etc., be provided.

Preferably, the inventive

Ringwal zVorrichtung a drive device for

Driving the pressing member, so that the ring blank is rotatable during rolling by the movement of the pressing member. 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 with each rotation to a smaller thickness. In this way, a larger Thickness reduction and a smoother,

material-friendly rolling can be achieved.

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 in the

inventive ring rolling device would also be conceivable, the rotation of the drive roller can be done continuously and at a constant speed, a again

Reset the pressing element after rolling is eliminated.

In the following, the inventive

Ringwal zVorrichtung with reference to the accompanying drawings by way of embodiments

described in more detail. Show it:

Fig. 1 - a perspective view of a

Embodiment of an inventive Ringwal zVorrichtung; a section through the ring rolling apparatus of Figure 1 shortly before rolling a ring blank.

3 shows a section through the ring rolling apparatus of FIG. 1 analogous to FIG. 2, but during the rolling of a ring blank; FIGS. 4-5 are various perspective detail views of parts of the ring rolling apparatus of FIG. 1

Fig. 6 - a sectional view of a revolver drum of

Ring whale zVorrichtung of Fig. 1;

Fig. 7 is an enlarged view of the section VII of Fig. 6;

Fig. 8 - an axial section through a

Stop arrangement of the ring rolling device according to a second embodiment;

Fig. 9-10 - two perspective views of

Stop arrangement of Fig. 8;

Fig. 11 - an alternative mandrel of

Ring whale zVorrichtung;

FIG. 12 shows a detail section of the ring rolling device with a mandrel according to FIG. 11 located in the stop position; FIG. and

Fig. 13 - a section through a in a rolling bearing of

Ring rolling device used assembly or disassembly tool.

For the following description, the following definition applies: If in a figure for the sake of clarity of the drawing reference numbers are given, but in

directly related description part not mentioned, reference is made to their explanation in the preceding or following description parts. Vice versa are not included in all figures to avoid overcharging graphic for the immediate understanding less relevant reference numerals. For this purpose, reference is made to the other figures.

The embodiment shown in FIGS. 1 and 2 of a ring rolling device according to the invention comprises as pressing element a drive roller 1, which has a rolling surface 11 on its circumference, which is bounded on both sides by a collar 12 or 13. The collars 12 and 13 prevent during the ring rolling a lateral

Expansion of the Ring Blank 9. The drive roller 1 is rotatably supported by a shaft 14 on a bearing plate 15 and is by means of a drive device 10th

driven.

The bearing plate 15 is for example about three

Rail gripping elements 151, 152 and 153 in the direction of a revolver rotating shaft 39 (Fig. 2) adjustable above and below attached to 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 are adjusted in the direction of the roll gap, whereby the

Size of the roll gap at its narrowest point

can be adjusted. The adjusting spindle 154 has for this purpose, for example, an external thread, which in an internal thread in a passage 83 through the

Machine frame 8 engages through which the

Adjusting spindle 154 is arranged.

When ring rolling the ring blank 9 between the

Driven roller 1 and a mandrel 2 rolled in a Delivery arrangement in the form of a revolver drum 3 is rotatably mounted. Fig. 2 it 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 revolver drum 3 is connected via a shaft 33 on

Machine frame 8 is rotatably mounted and is rotated by means of a drive device 30, for example, an electric drive or servomotor.

For supplying ring blanks 9 to the spines 2 in the revolving drum 3, the illustrated

Ringwal zVorrichtung a Ringrohlingzuführeinrichtung 5. The ring blank feed device 5 is designed to supply ring blanks 9 individually to a point at which a mandrel 2 passes through the supplied ring blank 9

is durchsteckbar, that is 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 supply chute 51 is provided at its lower end with an opening through which a

Ring blank 9 due to gravity directly to

Charging position arrives. 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 acts by means of a cam roller 53 acting on a cam roller 53

Spring element 54 is held in a retaining position in which it holds the ring blanks 9 in the supply chute 51. To release a single ring blank 9 is simply by means of a rotatable around the Revolvertrommeldrehachse 39 control cam 55 against the

Spring force on the cam roller 53 acted. To store a ring blank 9 around a mandrel 2 and later a rolled ring 90 again from the mandrel 2

To be able to remove, 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 storage of the

Ring blanks 9 around the mandrel 2 around and removing the rolled out of the blank 9 ring 90 from the mandrel 2 takes place at two different locations, namely on the one hand directly below the supply shaft 51 and on the other hand, approximately after a rotation of the revolving drum 3 by about 150 ° the mandrel 4 4 two separate

Adjusting cylinder 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 to Fig. 2, the difference is only in that the revolving drum 3 is rotated in Fig. 3 about 10 ° in the counterclockwise direction as in FIG. 2. In Fig. 2 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 get to the situation shown in Fig. 3, the revolver drum 3 is about 10 ° in

Turned counterclockwise. 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 this in a further rotation

will pull along.

The second ring blank 9 is by turning the

Revolver drum 3 due to the reduction of the

Rolling gap between the second mandrel 2 and the drive roller 1 with the latter come into contact and to a

rolled smaller thickness. Due to the contact with preferably rotating at a constant speed, 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. Be particularly advantageous - depending on the size of the ring blank and the desired

Thickness reduction - three to thirty times,

in particular eight to twelve times, preferably approx.

ten times, turning the ring blank during rolling proven. To achieve this, the

Rotational speeds of the drive roller 1 and the

Revolver drum 3 suitably chosen. The multiple turning of the ring blank 9 during ring rolling enables a greater reduction in thickness and a more uniform, material-sparing rolling. 4 and 5, the mandrel 4 is shown in more detail. As already described above, the mandrel adjusting device 4 comprises two separate, attached to the machine frame 8

Adjusting cylinder 41 and 42. The adjusting cylinder 41 comprises an extendible piston 411, on which a

Impact head 412 is attached. In the situation shown in FIG. 4, the impact head 412 abuts against a head 21 of the mandrel 2 and thus during extension of the piston 411 the mandrel 2 in the mandrel longitudinal direction into the revolving drum 3, where it is inserted through a ring blank 9 located in the loading position ,

The adjusting cylinder 42 comprises an extendible piston 421 to which a Hintergreifköpf 422 is attached. The Hintergreifköpf 422 engages in the illustrated in Figs. 4 and 5 situations the mandrel head 21 of another mandrel 2 and thus pulls when retracting the

Piston 411 this mandrel 2 in the mandrel longitudinal direction of the revolver drum 3 and thus also in this

Revolver drum position finished rolled ring 90 out. In Fig. 4, the mandrel 2 is still in the

Starting position in the revolving drum 3, while it is partially moved out of the revolving drum 3 in Fig. 5. The engaging behind the mandrel head 21 through the

Hintergreifköpf 422 is done by turning the

Revolver drum 3, whereby the mandrel head 21 via a

Rear grip part 4220 of Hintergreifköpfs 422 is pushed.

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 has Ring rolling device on a hold-down 40 which is fixed in a flange about a mounted on the machine frame 8 mounting tube 81. This hold-down 40 forms a stop for the mandrel head 21, as best seen in Fig. 5.

From Fig. 6 it can be seen that the revolver drum 3 in the illustrated embodiment, two spaced, on the common shaft 33 (see FIG. 2) rotationally rigidly interconnected, disc-like

Drum parts 31 and 32 comprises, in each of which an end portion of the mandrels 2 is rotatably mounted, so that in each case a central part of the mandrels 2, around which 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 34 (Fig. 2) is arranged, the mutual distance of the

Drum parts 31 and 32 determines. The most significant difference of the inventive Ringwal zVorrichtung relative to the ring rolling device according to CH 706 844 AI consists in the manner in which the mandrels 2 are rotatably mounted in the revolving drum 3. In the known ring rolling device, the mandrels are supported, inter alia, on rotatable support rollers. In contrast, the spines are 2 in the

According to the invention, the ring rolling device is mounted in each case in two roller bearings arranged so as to be axially fixed in the revolving drum 3, as shown in FIG. 6 and in particular in the enlarged detailed view of FIG. In the two disc-like drum parts 31 and 32 are uniformly distributed over the circumference five first bearings 310 and five second bearings 320 arranged axially fixed, each having a first

Rolling 310 and a second rolling bearing 320 axially

to stand in alignment. In the rolling bearings 310 and 320 respectively sleeve-shaped bushes 311 and 321 are rotatably mounted and secured against axial movement (Fig. 7). In each case, a bushing 311 and a sleeve 321 together take a mandrel 2. When retracted into the turret drum 3 mandrel 2 (lower part of Fig. 6) is a first end portion of the mandrel 2 in the sleeve 311 of the first bearing 310 and a second end portion of the mandrel 2 in the sleeve 321 of the second rolling bearing 320. Between the Both end parts is the middle part of the

Dorns 2, on which rests the blank 9 to be rolled. When from the revolving drum 3 partially pulled-out mandrel 2 according to the upper part of Fig. 6 is the front, left in the drawing, the second end portion of the mandrel 2, previously in the sleeve 321 of the second

Rolling 320 was received, now in the sleeve 311 of the first rolling bearing 310. At the entrance or

Extending movement of the mandrels 2 remain the rolling bearings 310 and 320 and the rotatably mounted in them bushings 311 and 321 axially stationary, so it will only the mandrels themselves are moved. This has the advantage of a smaller displaced mass, allowing faster and easier shifting. The first and second rolling bearings 310 and 320 are, as shown here, preferably designed as a spherical roller bearing, for example, according to DIN 635-2.

Spherical roller bearings hold high radial and axial Loads stood and are well suited to compensate for misalignments. Moreover, they are comparatively

compact. The rotatable in the spherical roller bearings 310 and 320 bushings 311 and 321 are due to the

inherent properties of spherical roller bearings to a certain extent with respect to the axis of rotation of the bearing tiltable, which is just the compensation of

Escape possible. The tiltability of the bushings 311 and 321 is limited by radial stops 312 and 322 so far that the mandrels can be inserted smoothly into the second rolling bearing, without the rotational movement is impeded at maximum deflection. In addition to spherical roller bearings, there are also other bearings which are tangentially free within a certain range (e.g., carbide or toroidal roller bearings, self-aligning ball bearings, or combined bearings). Decisive is the tangential freedom of the bearings. By tangential freedom is to be understood that they are misalignments between the

Rotary axis of the bearings and the axis of rotation of the stored mandrel can compensate. Spherical roller bearings are preferred because of their long service life. To facilitate insertion of the mandrels 2 in the bushes 321 of the second rolling bearing 320 321 a funnel-shaped insertion slope 323 is formed on the bushes. Furthermore, the mandrels 2 are conical or rounded at their front ends 2a. As a result, the bearings can easily and quickly align with each other, without jamming of the mandrel takes place in the sleeve. For positioning the mandrels 2 in their longitudinal direction is in the drum part 32 of the revolving drum 3 coaxial with the second rolling bearings 320 each one (eg by means of a

Schraubgewindes) axially adjustable stop member 325 is provided which extends slightly into the second rolling bearing 320 and the bushes 321 inside. Due to the adjustability of the stop element, the

Requirements for machining accuracy lowered and readjustment or replacement in case of wear

allows. The stop element 325 has a

Feed line 326, the smaller, not

designated branch lines in the interior of the sleeve 321 opens. About this supply line, the sleeve 321 at times when there is no mandrel 2 in them, from outside a cleaning and / or a coolant can be supplied.

Instead of the rotationally fixed stop member 325, a stop assembly may be provided with a rotatably mounted stop member, as in the

Figures 8-10 is shown. The stop assembly 3250 includes an externally provided with a thread 3251 fixed part 3252 in which by means of a ball bearing 3253 a stop member 3254 is rotatably mounted. The stop element 3254 has a supply line 3255, which opens via smaller branch lines 3256 into the interior of the sleeve 321. About this supply line, the sleeve 321 at times when there is no mandrel 2 in it, from the outside a cleaning and / or a

Coolant can be supplied. The stop assembly 3250 is like the stop member 325 screwed into the drum part 32 of the revolver drum 3 and can be adjusted axially via the thread 3251. As an alternative to the longitudinal positioning of the mandrel 2 over its front end 2a, the longitudinal positioning can also take place by means of an alternative stop element, which cooperates with a collar 22 formed directly on the mandrel head 21 at the rear end of the mandrel. FIG. 11 shows one with such a collar 22

equipped mandrel 200.

As is apparent from Fig. 12, the alternative is

Stop element formed here by the first roller bearing 310 rotatably mounted bushing 311, at the

End of the collar 22 rests with retracted mandrel 200. The alternative stop element can thus rotate with the mandrel, so that friction between the mandrel and the stop element is avoided. The collar 22 is slightly smaller in diameter than the mandrel head 21, so that the latter is still safe from Hintergreifköpf 422nd

can be underrun.

The end face of the mandrel head 21 is formed slightly curved so that the mandrel, if it is pressed in the direction of the head, a smaller frictional torque acts. Alternatively, the front side could, for example, be conical or flat.

The bearings 310 and 320 are formed as inserts that can be easily installed as a whole in the revolver drum 3 and again removed from this. As a result, the ring rolling device can be quickly and easily converted to another mandrel diameter. Also, these inserts allow the cooling of the bearings and the two revolver drum parts in a closed

Circulation.

From Fig. 7 it can be seen that the rolling bearings 310 and 320 are spirally enclosed by a coolant channel 317 and 327, respectively, which communicate with annular grooves 318a and 318b and 328a and 328b, respectively

Coolant can be supplied or discharged again. The spiral-shaped coolant channels 317 or 327 and the annular grooves 318a and 318b or 328a and 328b form outer coolant supply and discharge ports, not shown

Coolant discharge lines a closed

Coolant system for cooling the rolling bearings 310 and 320 and the two Revolertrommelteile 31 and 32. Unspecified seals in the inserts prevent the ingress of dirt and water during both rolling and when not in use.

The first rolling bearing 310 shown on the right in the drawings are accessible from the (also shown on the right) front side of the ring rolling device ago and therefore relatively easy to install and remove. In the case of the second rolling bearings 320 shown on the left, however, this is more complicated if the revolving drum 3 is not to be dismantled. In order to easily disassemble or reinsert also the second rolling bearings 320, their bushings 321 are equipped with a positive locking element, which is the intervention of a special, equipped with gripping elements

Mounting tool allows. The form-fitting element is formed in the embodiment shown in Fig. 7 as an inner circumferential groove 329. The bushings 311 of the first roller bearings 310 likewise have an annular groove 319 on which, if necessary, also to start

Tool can be used.

An example of an assembly tool 1000 is shown in FIG. It comprises a rohrformigen handle 1010 with a flange 1011 and a rohrformigen extension 1012, whose outer diameter corresponds to the inner diameter of the bushes 321. In the handle 1010, a plunger 1013 against the force of a coil spring 1014 inwardly (in the figure to the left) slidably disposed. At the

front (inner) end of the plunger 1013 is seated

Locking slide 1015, whose outer diameter is slightly smaller than the inner diameter of the sleeve 321 and on the extension 1012 facing side has a conical taper.

For disassembly of a second rolling bearing 320, first, the axially aligned first roller bearing 310 from the

Drum part 31 of the revolver drum 3 removed. Then, the tool 1000 is inserted into the bushing 321 of the second rolling bearing 320 ahead of the resulting opening in the barrel member 31 with its gate valve 1015, as shown in FIG. The plunger 1013 is kept pressed inwards, so that between the locking slide 1015 and the extension

1012 an annular gap is formed in which at least one locking ball 1016 is located. By releasing the plunger

1013 pushes the coil spring 1014 the locking slide 1015 to the outside (in the figure to the right). As a result, the blocking ball 1016 is pressed radially outward beyond the bevel of the blocking slide 1015 until it engages in the annular groove 329 of the sleeve 321. Now, the second rolling bearing 320 by means of the tool 1000 from the second Drum part 32 pulled out and through the first

Drum part 31 are removed from the ring rolling device. To insert a second rolling bearing 320, the procedure is reversed, wherein the tool 1000 can be pulled out of the rolling bearing 320 used with the ram 1013 pushed in.

In the example shown, the tool 1000 as

Gripping element on a ball 1016 or more balls. Balls have the advantage that they can be easily blocked in their final position without having to be aligned.

The above-described design of the delivery arrangement as a revolver drum, in particular with a plurality of rotatably mounted on her thorns, although it is preferred that

However, the invention is not limited thereto. Thus, the feed arrangement can be realized, for example, as a movable mandrel bearing assembly over

corresponding drive devices in one or two dimensions is movable, wherein the mandrel in the

Charging position brought, moved against the drive roller and is brought away from the drive roller in the unloading position.

Claims

claims

A ring whale device for expanding a ring blank (9), comprising a pressing element (1), a rotatably mounted mandrel (2; 200) having a first end part, a second end part and a middle part therebetween, around which the ring blank (1) 9) is storable, and one

In which the mandrel (2; 200) is rotatably mounted with its first end part in a first rolling bearing (310) and with its second end part in a second rolling bearing (320), so that the middle part of the mandrel (2; 200) for supporting the ring blank (9) is exposed, and by means of which feed arrangement (3) the mandrel (2; 200) to the pressing element (1) every now and then movable away therefrom, wherein between the mandrel (2; 200) and Pressing element (1) a decreasing roll gap is formed, in which the ring blank (9) is rolled, wherein the second rolling bearing (320) in the feed assembly (3) axially fixed and the mandrel (2; 200) axially relative to the second Rolling bearing (320) is movably mounted, so that the second end portion of the mandrel (2; 200) from the second rolling bearing (320) can be pulled out or inserted into this, characterized in that also the first rolling bearing (310) in the feed arrangement ( 3) is arranged axially fixed and the mandrel (2;

200) is mounted axially movable relative to the first rolling bearing (310).

2. Ring rolling device according to claim 1, characterized

in that the first and the second roller bearings (310, 320) are designed as tangentially movable bearings.

3. ring rolling device according to claim 2, characterized

in that the first and the second roller bearings (310, 320) are designed as spherical roller bearings or self-aligning ball bearings.

4. ring rolling device according to one of claims 1 to 3, characterized in that in the first and in the second rolling bearing (310, 320) axially fixed sleeve-shaped bushes (311, 321) for receiving the mandrel (2; 200) are rotatably mounted.

5. ring rolling device according to claim 4, characterized

characterized in that the bushes (311, 321) are arranged tiltably relative to the axis of rotation of the first and the second rolling bearing (310, 320).

6. ring rolling device according to claim 5, characterized

characterized in that the tiltability of the bushings (311, 321) by stops (312, 322) is limited.

7. ring rolling device according to one of claims 4 to 6, characterized in that at least in the second rolling bearing (320) arranged bush (321) a

funnel-shaped insertion bevel (323).

8. ring rolling device according to one of claims 4 to 7, characterized in that at least in the second rolling bearing (320) arranged bush (321) has a preferably designed as an annular groove (329) form-fitting element for applying a mounting tool (1000).

9. ring rolling apparatus according to one of claims 1 to 8, characterized in that the mandrel (2; 200) at its front end (2a) is conical or rounded at the second end portion.

10. Ring rolling device according to one of claims 1 to 9, characterized in that the feed arrangement (3) has a preferably adjustable stop element (325, 3254) for the front end (2a) of the mandrel (2) for

Positioning of the mandrel (2) in its longitudinal direction.

11. ring rolling apparatus according to claim 12, characterized

characterized in that the abutment member (325; 3254) partially projects into the second rolling bearing (320) and with a in the interior of the second rolling bearing (320) outfeed supply line (326; 3255) for a

Cleaning and / or coolant is formed.

12. ring rolling apparatus according to claim 10 or 11, characterized in that the stop element (3254) is rotatably mounted.

13. ring rolling apparatus according to one of claims 1 to 9, characterized in that the feed arrangement (3) has a stop element for a stop collar (22) on the first end portion of the mandrel (200) for positioning the mandrel (200) in its longitudinal direction.

14. ring rolling device according to claims 4 and 13, characterized in that the stop element by the first rolling bearing (310) rotatably mounted bush (311) is formed.

15. Ring rolling device according to one of claims 1 to 14, characterized in that the feed arrangement is a rotatable turret drum (3), wherein the

Revolver drum (3) relative to the pressing element (1) is arranged so that by rotating the revolver drum (3) between the mandrel (2; 200) and the pressing element (1) a decreasing rolling gap is formed.

16. ring rolling device according to claim 15, characterized

characterized in that the revolver drum (3) has two

spaced apart, torsionally rigid with each other

connected, disc-like drum parts (31, 32), in which the first rolling bearing (310) and the second

Rolling bearings (320) for the mandrel (2; 200) are axially fixed.

17. Ring rolling device according to one of claims 1 to

16, characterized in that the first and the second rolling bearing (310, 320) are mounted interchangeable as a whole in the feed arrangement (3).

18. Ring rolling device according to one of claims 1 to

17, characterized in that they are a preferably closed cooling system (317, 318a, 318b, 327, 328a, 328b) for the rolling bearing (310, 320) and / or

Delivery arrangement (3).