EP2933037B1 - Multiple roller table ring-rolling mill and method for rolling of rings in a multiple roller table ring-rolling mill - Google Patents

Description

The invention relates to a multi-roll table-type rolling mill comprising at least one main roll and two mandrel rolls mounted in a mandrel roll table revolving around a mandrel roll axis, the main roll rotating about a main roll axis and the main roll axis and mandrel axis being fixed invariably and eccentrically to one another at least during rolling , The invention also relates to a method of rolling rings in a multi-roll table-type rolling mill in which at least two mandrel rolls mounted in a mandrel roll table revolve around a main roll, a roll gap formed respectively between the mandrel rolls and the main roll depending on an angular position with respect to the main roll of the mandrel roll table is reduced to a minimum nip and then increased again.

Ring rolling mills are available in various orders of magnitude, with a main roll and a mandrel roll being pressed against one another for very large rings, as a rule, and the roll to be rolled circulating in the nip between these two rolls. Depending on the specific requirements, axial rolls and / or further special rolls are then provided in the case of very large ring rolling mills. In this case, the rolling process, since the ring can ultimately be performed as often as desired by the respective roll gaps, and the degrees of deformation can be chosen relatively freely. However, such ring rolling mills build relatively complex and therefore correspondingly expensive, and the process flow can be complex and especially very time consuming. Such ring rolling mills are for example from the DE 25 04 969 A1 or from the DE 10 2011 108 113 A1 known.

Much higher throughput can be achieved by multi-roll table rolling mills in which at least two, but generally at least four, mandrel rolls are mounted on a mandrel roll table which can revolve around a main roll. Such an arrangement is for example in the DE 26 15 802 A1 however, each individual rolling process according to the above-described ring rolling mills can be made by customizing the respective mandrel roll with respect to the main roll for each of the rings individually. Due to the mandrel rolling table, the supply to Rolling rings or ring blanks and the removal of the rolled rings significantly accelerated and integrated into the rolling process.

Very high production speeds allow Mehrwalzentischringwalzwerke, as for example in the DE 10 98 481 B wherein the multi-turntable ring mill shown there comprises a main roll and four mandrel rolls mounted in a mandrel roll table revolving around a mandrel roll axis and wherein the main roll rotates about a main roll axis and the main roll axis and mandrel axis are fixed invariably and eccentrically to one another at least during rolling are or only by the change in the angular position of the mandrel roll table with respect to the main roll, a roll gap is reduced to a nip minimum. After passing through the nip minimum, the nip increases again, so that the rolling process is completed. For conversion purposes, it is possible, the mandrel rollers on the mandrel roll table DE 10 98 481 B implement. However lead, like in particular also the DE 26 15 802 A2 in the discussion of DE 10 98 481 B emphasizes unavoidable fluctuations in the volume of use of the ring blanks or the rings to be rolled directly to fluctuations in diameter and height, which then leads to extremely complicated manufacturing equipment, as usually still Kalibrierpressen for the diameter and often even more Kalibrierpressen for the required ring height must be followed.

Mehrwalzentischringwalzwerke, in which the ring is measured continuously by means of a measuring finger, wherein the entire measuring unit is briefly taken away from the mandrel roll table, for example, from the generic JP S62 244541 known.

It is an object of the present invention to provide a generic Mehrwalzentischringwalzwerk and a generic method for rolling rings in a Mehrwalzentischringwalzwerk in which structurally simple manner a sufficient dimensional stability of the finished rings can be ensured.

The object of the invention is achieved by a Mehrwalzentischringwalzwerk or by a method for rolling rings in a Mehrwalzentischringwalzwerk with the features of the independent claims. Further advantageous embodiments can be found in the subclaims.

Thus, to ensure a structurally simple manner a sufficient dimensional stability of the finished rings, a Mehrwalzentischringwalzwerk, which at least one main roll and two mandrel rolls, which are mounted in a rotating about a mandrel roll axis mandrel table, comprises, and wherein the main roll rotates about a main roll axis characterized in that the multi-roll table-type rolling mill has effective unloading means for relieving at least one of the mandrel rolls of rolling forces, irrespective of the eccentricity of the main roll axis and the mandrel roll axis. Such relieving means make it possible, in a suitable embodiment, to interrupt a rolling process independently of the angular position of the mandrel rolling table with respect to the main roll, so that in this way the dimensional stability of the respectively rolled ring can be specifically acted upon.

It is understood that the time or the angular position of the mandrel roll table, to which the relief means then exonerate, can be determined according to different criteria. Thus, it is conceivable, for example, that the volume of the blank used is determined beforehand and, based on the volume, an angular position or a point in time at which the discharge is to be used is determined. It is also understood that other criteria, such as the ring diameter or the strength of a ring can be measured directly in order to obtain a corresponding criterion in this way.

In particular, in order to ensure structurally simple manner a sufficient dimensional stability of the finished rings, a corresponding Mehrwalzentischringwalzwerk is advantageous, which comprises measuring means for measuring a ring diameter of a ring located between a mandrel roll and a main roll and rolled. By means of appropriate measuring means, it is also possible, in particular, to specifically address the respective rolling process before any possible sizing presses or other reworking, in which case, of course, it makes sense, in particular, to correspondingly couple the relief means explained above with these measuring means. On the other hand, other dimensionally influencing measures in response to these measurements are conceivable, such as an adjustment of the eccentricity between the main roller axis and mandrel axis axis.

Accordingly, it is particularly advantageous if the multi-roller table-top roller mill comprises both the unloading means described above and the measuring means described above. In particular, the measuring means may be operatively connected to the unloading means such that the unloading means relieve a mandrel roll when a certain ring diameter is reached. For this purpose, it is in particular possible to predetermine the specific ring diameter beforehand and to generate a signal via a nominal / actual comparison of the measurement result of the measuring means with the previously entered desired value for the specific ring diameter, which signal initiates a release process for a particular mandrel roll. By a directed to the specific ring diameter operative connection, a coupling of the discharge means with the measuring means structurally particularly easy to implement, for example, by a lever, push button or switch is operated directly through the ring at a certain ring diameter.

Preferably, the measuring means are arranged on the mandrel roll table, so that it is possible to measure precisely, independently of the speed with which the angular position of the mandrel roll table changes.

In particular, a measuring means can be provided for each mandrel roller, so that for each mandrel roller individually or for each individually rolled ring an individual control is made possible. It is understood that cumulatively or alternatively also preferably corresponding mandrel removal means may be provided for each mandrel roll.

As already indicated above, different or different measuring devices can be used as the measuring means. Thus, for example, a scale can already serve as a measuring means if, for example, the volume used is to be used as a criterion from which angular position or at which point in time unloading should take place. Likewise, for example, cameras are conceivable, with which the entire mandrel roll table is detected with all the rings located on it, in which case the corresponding criteria are evaluated and evaluated via an image evaluation. Likewise, for example, optical distance measurements readily for determining the ring diameter are possible, wherein such optical distance meter are preferably arranged on the mandrel roll table and rotate with the mandrel rolls. Instead of optical distance meter but also mechanical or electrical contacts can be provided, determined by which ring diameter and an end of the rolling process can be initiated. Such mechanical or electrical contacts, such as, for example, levers, buttons or switches, can be set in particular at predefined positions on the mandrel roller table, so that when a ring reaches these switches, the rolling process can then be stopped accordingly. It is understood that all other measuring devices with which relevant criteria for terminating the rolling process can be determined by measurement can accordingly be used. For example, inductive measurements or even acoustic measurements may possibly be used accordingly.

It is understood that, should the ring diameter be used as a criterion, the ring outer diameter or the ring inner diameter, possibly also a center diameter or other defined as diameter definable sizes, can be used as a criterion. Ultimately, this depends on the desired type of dimensional accuracy and the possibilities of metrologically determining it.

The relieving means may comprise a releasable mandrel roller lock of the respective mandrel roll on the mandrel roll table, whereby a discharge can be ensured in a structurally simple manner, since then the mandrel roll dissolved and no rolling forces can be applied when the Dornwalzenarretierung is solved. For example, it is conceivable to guide the loosened mandrel roller in a slot when the mandrel roller lock is released, wherein the mandrel roller lock, when the mandrel roller is locked by it, can press the mandrel roller against one end of the slot. Accordingly, then takes the mandrel roll lock on the rolling forces; when the mandrel roller lock is released, this is no longer possible, so that the rolling process is completed.

Cumulatively or alternatively to the releasable mandrel roll lock, the relief means may comprise displacement means for displacing a bearing of the respective mandrel roll on the mandrel roll table. Even a very small displacement of a mandrel roll away from the main roll ends a respective rolling process. Such displacements can for example also be implemented by motor. Likewise, such a displacement, for example, then carried out mechanically, in which upon reaching a certain ring diameter, a mechanical lever through the ring, which ultimately the eccentricity between the main roll and Dornwalzentisch following, pushes outward, is pushed outwards and solves Dornwalzenarretierung in this way simultaneously exerts a force on the mandrel roller radially outward. Possibly. can also be used in the revolving mandrel roll or by the rotating main roller energy for this movement by using appropriate gearbox when the corresponding criterion, such as reaching the specific ring diameter, is met.

Accordingly, motors or other actuators can be used as displacement means. In this respect, electric motors or electrically operated actuators appear to be advantageous as displacement means. As a mechanical displacement means are in particular lever or lever assemblies or other gear, which are driven by moments or forces of Mehrwalzentischringwalzwerks and switched on only upon reaching the predetermined ring diameter, the latter in particular also purely mechanically but in turn can be done by an actuator or motor, or spring arrangements , which are biased, for example, in question. In this case, the displacement means, in particular if they directly motors or actuators include, other transmission elements, such as an eccentric bearing of the mandrel rollers on an eccentric, which in turn sits on a motor shaft, or a bearing of the mandrel rollers on a motor or driven by an actuator lever or on a linear drive.

Preferably, the multi-roller table-type rolling mill has return means for returning the mandrel roll from a release position in which it is unloaded to a rolling position where it can encounter rolling forces again, the return means being preferably provided in an angular layer area of the mandrel roll table in which the respective mandrel rolls is not burdened with rolling forces. In this way, the rolling forces do not have to be overcome for a return.

As feedback means of course any displacement means, such as electric motors or the like, serve. On the other hand, for example, only a bevel can be provided, on which the mandrel roll is passed while the mandrel roll table is rotated around the main roll, and which is arranged such that the mandrel located in a release position is returned by the bevel back to its rolling position.

It is understood that the return means may possibly lock a Dornwalzenarretierung again, insofar as it does not lock itself, for example by a latching connection automatically when a mandrel roller enters the rolling position.

In a structurally simple manner, a sufficient dimensional stability of the finished rings can be ensured by a method for rolling rings in a Mehrwalzentischringwalzwerk in which at least two mandrel rollers mounted in a mandrel roll revolve around a main roll, one each between the mandrel rolls formed roll gap depending on an existing with respect to the main roll angular position of the mandrel roll table is reduced to a nip minimum and then increased again and wherein the method is characterized in that upon reaching a predetermined ring diameter, a corresponding mandrel roll is transferred from a rolling state in a freewheeling state even if the minimum gap has not yet been reached.

It is understood that the angular position of the mandrel roll table is ultimately to be set with respect to the main roll axis, ie with respect to a not with the main roll with rotating coordinate system, or with respect to the mandrel roll axis. For example, the above-mentioned eccentricity between the main roll axis and the mandrel roll axis automatically yields, for example, that a respective roll gap between mandrel roll and main roll periodically changes and varies between a minimum and a maximum. This change is directly proportional and in a fixed functionality to the angular position. In this case, this eccentricity is interrupted when a corresponding mandrel roller is transferred upon reaching a predetermined ring diameter of a rolling state in a freewheeling state, since then this predetermined minimum roll gap for this run is no longer achieved.

For transferring the mandrel roll from a rolling state to the freewheeling state, the nip of a corresponding mandrel roll can be opened. This requires an immediate end of the respective rolling process.

Likewise, a rolling process ends when the corresponding mandrel roller is relieved of the rolling force and in this way the mandrel roller is transferred from the rolling state in the freewheeling state.

In order to be able to move accordingly, a mandrel roll, after it has been brought into the freewheeling state, is preferably returned to the rolling state with this mandrel roll before the beginning of the next rolling process. Alternatively, it would be conceivable to perform a transfer to the rolling state during the rolling process, but this would then have to take place against the rolling forces and would be correspondingly expensive. If the return to the rolling state before the beginning of the next rolling process, so no rolling forces are to be overcome accordingly.

For transferring the mandrel roll from the rolling state to the freewheeling state, the respective mandrel roll can move with respect to the mandrel roll table from a rolling position to a rolling position Release position, which is further away from the main roll than the rolling position, to be relocated. This requires a structurally very simple implementation of the opening of the nip and relief of the corresponding mandrel roller.

After a shift from the rolling position to the release position, this mandrel roll is preferably moved back into the rolling position, so that it is possible to continue the process continuously. As already explained above, this backward displacement preferably takes place before the beginning of the next rolling process with this mandrel roll, since then the backward displacement does not have to take place against the rolling forces.

Figur 1

eine schematische Aufsicht auf ein Mehrwalzentischringwalzwerk; und

Figur 2

das Mehrwalzentischringwalzwerk nach Figur 1 bei vorgenommener Entlastung einer Dornwalze

Further advantages, objects and features of the present invention will be explained with reference to the following description of exemplary embodiments, which are shown in particular in the appended drawing. In the drawing show:

FIG. 1

a schematic plan view of a Mehrwalzentischringwalzwerk; and

FIG. 2

the multi-roll table-top mill after FIG. 1 when the discharge of a mandrel roller

The multiple-roll table-top mill 10 illustrated in the figures comprises centrally a main roll 20 which rotates about a main roll axis 26 and four mandrel rolls 30 which are mounted on a mandrel roll table 35 which in turn rotates about a mandrel roll axis 36.

Here, the main roll axis 26 and the mandrel roll axis 36 are offset from each other, so that in this way an eccentric arrangement of these two axes and the main roll 20 and the mandrel roll table 35 is conditional. The respective direction of rotation 27 of the main roll 20 about the main roll axis 26 and the direction of rotation 37 of the mandrel roll table 35 and the mandrel rolls 30 about the mandrel roll axis 36 is indicated by arrows.

The mandrel rolls 30 are supported at the mandrel roll table 35 at an identical distance from the mandrel roll table axis 36, so that a roll gap 16 between the respective mandrel roll 30 and the main roll 20 is periodically between a roll nip maximum and a minimum roll gap depending on the angular position of the mandrel roll table 35 with respect to the mandrel roll axis 36 and to the main roll 20 changes.

On the mandrel rolling table 35 30 relief means 40 are also provided for each mandrel roll, which are formed in this embodiment as a displacement means 45 for the mandrel rollers 30, wherein for this purpose an eccentric 46, which is individually driven by a motor and mounted on each of the mandrel rollers 30 respectively is used. It is understood that this eccentric 46 can also serve as a return means 50.

In this embodiment, the mandrel roll 30 is closest to the eccentric 46 in a rolling position 62 of the mandrel roll axis 36, so that relatively little torque is introduced into the respective eccentric 46 by rolling forces acting on the mandrel rolls 30. In this respect, it is possible in this embodiment that the electric motor drives the eccentric 46 can meet the rolling forces. It is understood that in different embodiments here additionally locks, such as locking or the like, can be provided.

If an eccentric 46 is rotated about its axis relative to its rolling position, in particular rotated by 180 °, then the respective mandrel roller 30 reaches its release position.

In addition, in this exemplary embodiment, each mandrel roll 30 has measuring means 70 arranged on the mandrel roll table 35, which in this exemplary embodiment can measure the outside diameter of rings 15 which are located in the roll gap 16. The measuring means 70 are formed in this embodiment as optical distance meter. It is understood that in modified embodiments, other measuring means can be used.

Now, if a ring 15 of a mandrel roller 30 abandoned (mandrel roller position A), it is rolled with circulation of the mandrel roll table 35 in the direction of rotation 37 in the downsized nip until the nip position (mandrel roll position B) is reached. With further circulation of the mandrel roll table 35 in the direction of rotation 37, the roll gap widens, so that a further rolling does not take place, wherein the finished rolled ring 15 can then be removed again from the mandrel roll (mandrel roll position C).

As can be seen immediately, variations in the volume of use of the ring 15 in this in FIG. 1 process shown significant fluctuations in the ring diameter.

For this reason, the respective ring diameter is monitored by the measuring means 70 and the respective eccentric 46 transferred to its release position 61 when a predetermined ring diameter is reached.

This is checked in the present embodiment by comparing the respective measured values with a corresponding, predetermined value.

This transfer of the eccentric 46 and the mandrel roller 30 in the release position 61 is carried out in particular before reaching the specified by the eccentricity nip minimum (mandrel roller B), with any transfer to the nip minimum is not critical, since the rolling process is already completed anyway. If the ring 15 is removed (mandrel roller position C), an eccentric 46 located in its release position or a mandrel roller 30 located in the release position 61 are returned to the rolling position 62. This is done in this embodiment in the unloaded state, which according to the present process management this back transfer step can happen before or after, as long as it is ensured that this does not initiate or influence a rolling process. It is understood that in modified embodiments, the eccentric 46 can also be displaced in the direction of its rolling position during the rolling process. LIST OF REFERENCE NUMBERS 10 More roller table ring rolling mill 37 direction of rotation 15 ring 40 relief means 16 nip 45 displacement means 20 main roll 46 eccentric 26 Main roll axis 50 Return means 27 direction of rotation 61 release position 30 mandrel roll 62 roll position 35 Mandrel mill table 70 measuring Equipment 36 Mandrel mill table axis

Claims (13)

1. A multiple roller table ring-rolling mill (10) comprising at least one main roller (20) and two idler rollers (30), which are mounted in an idler roller table (35) that revolves about an idler roller table axis (36), wherein the main roller (20) rotates about a main roller axis (26) and the main roller axis (26) and the idler roller table axis (36) are arranged invariably and eccentrically to one another at least during the rolling process, characterized in that the multiple roller table ring-rolling mill (10) features relieving means (40), which are effective regardless of an eccentricity between the main roller axis (26) and the idler roller table axis (36) and serve for relieving at least one of the idler rollers (30) from rolling forces.
2. The multiple roller table ring-rolling mill (10) according to claim 1, characterized in that the multiple roller table ring-rolling mill (10) comprises measuring means (70) for measuring a ring diameter of a ring (15), which is located and rolled between an idler roller (30) and a main roller (20).
3. The multiple roller table ring-rolling mill (10) according to claim 1 or 2, characterized in that the relieving means (40) comprise a separable idler roller locking device for the respective idler roller (30) on the idler roller table (35).
4. The multiple roller table ring-rolling mill (10) according to one of claims 1-3, characterized in that the relieving means comprise displacing means (45) for displacing a mounting of the respective idler roller (30) on the idler roller table (35) .
5. The multiple roller table ring-rolling mill (10) according to one of claims 1-4, characterized in that the multiple roller table ring-rolling mill (10) comprises returning means (50) for returning the at least one idler roller (30) from a release position (61) into a rolling position (62).
6. The multiple roller table ring-rolling mill (10) according to claim 2 or one of claims 3-5 as dependent on claim 2, characterized in that the measuring means (70) are functionally connected to the relieving means (40) in such a way that the relieving means (40) relieve an idler roller (30) when a certain ring diameter is reached.
7. The multiple roller table ring-rolling mill (10) according to claim 2 or 6 or one of claims 3-5 as dependent on claim 2, characterized in that the measuring means (70) are arranged on the idler roller table (35) .
8. The multiple roller table ring-rolling mill (10) according to claim 2, 6 or 7 or one of claims 3-5 as dependent on claim 2, characterized in that measuring means (70) are respectively provided for each idler roller (30).
9. A method for rolling rings (15) in a multiple roller table ring-rolling mill (10), in which at least two idler rollers (30) that are mounted in an idler roller table (35) revolve about a main roller (20), wherein a rolling gap (16), which is respectively formed between the idler rollers (30) and the main roller (10), is decreased to a rolling gap minimum and subsequently increased again in dependence on an angular position of the idler roller table (35) relative to the main roller (20), characterized in that a corresponding idler roller (30) is transferred from a rolling state into a free-wheeling state upon reaching a predefined ring diameter, namely even if the rolling gap minimum is not yet reached.
10. The rolling method according to claim 9, characterized in that the rolling gap (16) of a corresponding idler roller (30) is opened and/or the corresponding idler roller (30) is relieved from the rolling force in order to transfer the idler roller (30) from the rolling state into the free-wheeling state.
11. The rolling method according to claim 9 or 10, characterized in that the idler roller (30) is once again transferred into the rolling state after a transfer of the idler roller (30) into the free-wheeling state before the next rolling process with this idler roller (30) begins.
12. The rolling method according to one of claims 9-11, characterized in that the respective idler roller (30) is displaced relative to the idler roller table (35) from a rolling position (62) into a release position (61), which is spaced apart from the main roller (20) farther than the rolling position (62), in order to transfer the idler roller (30) from the rolling state into the free-wheeling state.
13. The rolling method according to claims 11 and 12, characterized in that the corresponding idler roller (30) is once again displaced back into the rolling position (62) after a displacement of the idler roller (30) from the rolling position (62) into the release position (61) before the next rolling process with this idler roller (30) begins.

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