EP2532449B1 - Device and method for rolling hollow blanks - Google Patents

Description

The invention relates firstly to a device for rolling in front of tube billets with a planetary cross rolling mill, with a feed bed, with a tube feed, with a Rohrluppen from the feed bed, starting by the planetary rolling mill pushing Rohrluppenvorschub having at least one feed apparatus, with a mandrel bar and with a mandrel bar holder wherein the tube feed has an axial tube feed conveyor that axially conveys a tube blank into a supply position provided axially behind the mandrel bar holder, and wherein the feed apparatus is disposed between the planetary cross rolling mill and the mandrel bar holder.

The invention relates, on the other hand, to a method for rolling tube blanks in a planetary cross rolling mill, in which the tube blanks are fed continuously into the planetary cross rolling mill, wherein two alternating feed devices push the tube blanks into the planetary cross rolling mill.

Moreover, the invention relates to a method for rolling tube blanks in a planetary cross rolling mill, in which the tube blanks are fed separately from each other the planetary cross rolling mill.

Generic devices and methods are varied from the prior art for the manufacture of pipes, for example from the DE 31 36 381 A1 in which a mandrel bar is held by a holding device arranged behind the planetary cross rolling mill, or from DE 44 28 530 C5 , Which discloses a separate radial promotion of Rohrluppen on a feed bed and insertion of the mandrel bar in the tube blank after the promotion of the tube blank on the feed bed, or from the DE 101 26 411 B4 known. Other rolling processes and rolling devices are for example from DE 26 57 839 A1 , of the DE 39 05 559 A1 and the DE 10 2007 014 079 A1 known.

For example, in the patent DE 101 26 411 B4 a method for rolling tube billets in a planetary cross rolling mill and a device for feeding tube billets into the planetary cross rolling mill, with which the performance of a planetary cross rolling mill can be increased.

In the patent DE 101 26 411 B4 For this purpose, it is proposed that the feeding of the tube blanks to be rolled into the roll gap is carried out continuously in bursts, whereby the respective tube blank following the roll gap is fed subsequent tube blank with a rotation corresponding to the rotation of the tube end that is caused by the torsion under the rolls. To carry out this method, a device for feeding tube blanks into the planetary cross rolling mill is provided. In the planetary cross rolling mill, the respective tube blank can be rolled over a stationary held in the nip inner tool. The device comprises a first and an axially spaced therefrom arranged second holding device for the mandrel rod, which are independently radially engageable with the mandrel rod, and a first and a second feed device for the tube blank, which can be independently adjusted radially to the tube and with this in the feed direction and / or against this are displaced. Furthermore, a device for pushing a new tube blank onto the rear end of the roll bar held in rolling position during rolling a preceding tube blank is provided, wherein the movement of the holding means and the feed devices are placed so that the rear end of the preceding and the front end the following tube assembly can be supplied to the roll gap abutting each other, wherein the feed device has freely rotatably mounted chucks around the tube longitudinal axis.

A disadvantage of generic continuously operating planetary cross rolling mills is the limited available stroke of the tube blank feed devices, which are usually designed as forward and backward movable feed slide. Due to the limited stroke of the feed slide, there is a frequent change of the feed slide engaged with the respective tube blank. This frequent change of the alternately engaged with the tube bill feed carriage often leads to a critical, non-uniform feed movement, which adversely affects the quality of finished rolled tube. In this case, a rolling process during copper rolling should be mentioned in particular, which is very sensitive in this regard and, in contrast, is particularly prone to failure.

In this respect, in general, a relatively high control effort with respect to the individual feed slide is required in order to make an attack from one feed slide to the other without jerk and without negative impact on the rolling can.

However, this also leads to an increased maintenance of such a tube-feeding device, since, for example, make changes or adjustments to a friction behavior "feed slide / tube billets" a more frequent Einjustieren the feed slide.

It is therefore an object of the present invention to further develop generic devices and methods for rolling tube billets with respect to a planetary cross rolling mill, so that in particular the abovementioned disadvantages can be eliminated.

The object of the invention is achieved by a device having the features of claim 1.

By means of such a rolling device, each tube blank can be supplied to the planetary cross rolling mill individually and without jerking in a rolling process in which the tube blanks are conveyed continuously, in particular continuously, to the feed bed. This is achieved in that each of the tube blanks can be pushed individually by means of the plunger in the planetary cross rolling mill, although the rolling device is continuously charged with tube blanks.

By means of the ram, on the one hand, in particular, a discontinuous process control on the planetary cross rolling mill is possible. Likewise, a very short handle of a rear feed apparatus is possible with continuous process control, as will be explained later.

The term "plunger" in the context of the invention describes any means by which to be rolled tube billets can be individually pushed into a nip of a planetary cross rolling mill by the plunger engages a tube billet in front of head and collides.

A particularly important embodiment provides that the plunger is radially displaceable, whereby advantageously a return stroke of the planetary cross rolling mill immediately upstream feed apparatus is possible, even if a tube blank is already in the ready position.

If the plunger is displaced radially, the next tube blank can be fed axially to the feed bed and at the same time immediately threaded or pushed onto the mandrel rod from behind, whereby a standstill time with suitable process control, if appropriate, can be at least halved compared to the prior art.

In addition, the mandrel always remains in a protective gas atmosphere of the rolling device, whereby the mandrel is thermally less stressed. As a result, the life of the mandrel bar can be significantly increased.

In this context, it is advantageous if a ram of a Rohrluppeneinstoßers the present device comprises a tubular body and the tubular body has a radial Dornstangeneinführöffnung which engages around the mandrel bar especially during stroke and / or return stroke, so that the plunger can perform its thrusting function, even if the mandrel bar protrudes at the rear end or rear head of the tube blank. A tube-like body advantageously integrates into an axial machining path or into an axial feed path, along which the tube blanks are conveyed or pushed.

Due to the presence of the radial Dornstangeneinführöffnung the plunger can be radially permanently open so that it can be easily removed radially from the mandrel bar or radially plugged onto the mandrel.

It is understood that the present plunger can be configured in many ways. Constructively very simple, the plunger is realized when it is designed U-shaped. As a result, the radial Dornstangeneinführöffnung structurally particularly simple to be formed axially extending on the plunger.

A radial displacement of the plunger can for example be practiced advantageously, if the present device has a radial support. Possibly. Radial displaceability can also be realized differently.

In order to always be able to align the plunger purposefully with respect to the mandrel of the device, it is advantageous if the plunger comprises a rotary drive.

Since conventional rolling devices and methods can be advantageously further developed by such a radially displaceable plunger, the features surrounding this radial displacement are inventive even without the other features of the present invention.

Also, an apparatus for rolling tube billets may include a planetary cross roll mill, a feed bed, a tube feed, a tube feed advancing the tube billets from the feed bed by the planetary roll mill, comprising at least one feed apparatus, a mandrel bar, and a mandrel bar holder, the tubule feed having an axial tube feed which axially conveys a tube blank to a stowage position provided axially behind the mandrel bar holder, the feed apparatus being disposed between the planetary cross rolling mill and mandrel bar holder and wherein the device is characterized in that the mandrel bar holder has at least two retainers, one of which is behind and behind a second are arranged in front of the feed apparatus.

The stroke of the feed apparatus can advantageously be dimensioned such that feeding a subsequent tube blank can be completed before the feed apparatus reached his final position. As a result, advantageously only one attack per tube blank takes place.

In addition, this is a very long stroke of the feeder possible without having to extend the space of the feed bed.

A further advantageous embodiment provides that the tube feed has at least one further feed apparatus, which is arranged behind the second holder means.

As a result, a continuous process is easily possible.

Especially in this context can process technology also in a method for rolling tube billets in a planetary cross rolling mill the tube billets are fed continuously butt to the planetary cross rolling mill, two alternating feeders push the tube billets in the planetary cross rolling mill and wherein the method is characterized in that the two Feeders are operated with different stroke lengths.

Advantageously, due to an asymmetry of the stroke lengths of the two feed apparatuses, a time available for recharging can be extended, as a result of which the corresponding cycle times are advantageously shortened.

Also, an apparatus for rolling tube billets may include a planetary roll mill, a feed bed, a tube feed, a tube feed advancing the tube billet from the feed bed by the planetary roll mill, comprising at least one feed apparatus, a mandrel bar and a mandrel bar holder, the tubule feed having an axial tube feed which axially conveys a tube blank into a staging position provided axially behind the mandrel bar holder, the feed apparatus being disposed between the planetary cross rolling mill and mandrel bar holder and wherein the apparatus is characterized in that the feed apparatus has a feed path longer than half the length of the feed Tube is.

By such a long feed path advantageously the number of attacks of the feed apparatus can be reduced or minimized to the tube blanks.

In another aspect, the object of the invention is also achieved by a method having the features of claim 10.

Such a collision of the respective tube blank is preferably carried out with a tappet, as described for example in connection with the invention in other places.

By bumping with such a plunger, a rear feed apparatus, if it is present, engage further back at a respective end of the tube blank, whereby also the number of attacks can be advantageously reduced.

Also, a method for rolling tube blanks in a planetary cross rolling mill, in which the tube billets are fed separately from the planetary cross rolling mill, characterized in that the respective tube blank is pushed over a mandrel bar before rolling. The advantage of this solution is to be seen specifically in that the mandrel bar can always remain in its feed bed position and thus also in the protective gas atmosphere of the rolling apparatus. As a result, the load on the mandrel bar can be significantly reduced. In addition, with suitable remaining process management, the tube bodies can pass through the feed bed more quickly and be pushed towards the planetary cross rolling mill.

Likewise, a method for rolling tube billets in a planetary cross rolling mill, in which the tube billets are fed separately from each other to the planetary cross rolling mill, characterized in that the tube blank is conveyed axially on a feed bed. An axial Zufördern the Rohrluppen is procedurally and temporally much cheaper to accomplish than a radial Zufördern, which is practiced in known discontinuous rolling process.

Moreover, it is advantageous if a feed apparatus passes through a return stroke past the tube blank, while the tube blank is conveyed axially onto the feed bed.

Advantageously, in this case at the same time the feed apparatus can be moved back, whereby in terms of the present rolling process, a further time savings can be achieved.

Moreover, a method for rolling tube billets in a planetary cross rolling mill wherein the tube billets are separately fed to the planetary cross rolling mill may be characterized by holding a mandrel bar disposed in the tube billet during rolling by a mandrel bar holder disposed in front of the planetary cross rolling mill. As a result, a much better rolling result can be achieved.

Figur 1

schematisch eine Seitenansicht eines ersten Ausführungsbeispiels einer Walzvorrichtung umfassend ein Planetenschrägwalzwerk und einen einzigen Vorschubapparat mit Stößel; und

Figur 2

schematisch eine Seitenansicht eines weiteren Ausführungsbeispiels einer Walzvorrichtung umfassend ein Planetenschrägwalzwerk und einen vorderen Vorschubapparat mit Stößel sowie einen hinteren Vorschubapparat, mittels welchen Rohrluppen abwechselnd entlang einer axialen Bearbeitungsstrecke geschoben werden.

It is understood that the features of the solutions described above or in the claims can optionally also be combined in order to implement the advantages in a cumulative manner. Further advantages, objects and features of the present invention will be elucidated with reference to the appended drawing and the following description, in which, by way of example, two devices for rolling tube blanks with a planetary cross rolling mill are illustrated. In the drawing show:

FIG. 1

schematically a side view of a first embodiment of a rolling apparatus comprising a planetary cross rolling mill and a single feed apparatus with plunger; and

FIG. 2

schematically a side view of another embodiment of a rolling device comprising a planetary cross rolling and a front feed apparatus with plunger and a rear feed apparatus, by means of which tube blanks are alternately pushed along an axial machining path.

The in the FIG. 1 Device 1 shown for rolling tube blanks 2 has a planetary cross rolling mill 3, by means of which the tube blanks 2 are successively rolled into finished tubes (not numbered here).

In front of the planetary cross rolling mill 3 is a feed bed 4, which comprises a tube feed 5, by means of which the tube bodies 2 are pushed axially along an axial machining path 6 to the planetary cross rolling mill 3.

The tube feed 5 is equipped in this embodiment, for this purpose with a single feed unit 7.

Starting from the planetary cross rolling mill 3, axially in front of the feed bed 4, a tube feed 8 with an axial tube feed conveyor 9 is placed.

In particular, by means of the axial tube feed conveyor 9, the respective tube blank 2 of the rolling device 1 is axially conveyed and thereby transported into a ready position 10 of the rolling device 1.

The feed bed 4 is also associated with a mandrel 11 and a mandrel bar holder 12.

The supply position 10 is located axially behind the mandrel bar holder 12, wherein the feed apparatus 7 between the planetary cross rolling mill 3 and the mandrel rod holder 12 is located.

In addition, the feed apparatus 7 is provided with a plunger 13 of a Rohrluppeneinstoßers 14, by means of which each one of the tube blanks 2 successively pushed the planetary cross rolling mill 3 or is pushed.

In this respect, this is a discontinuous feeding process.

Advantageously, however, the plunger 13 is displaceable radially from the axial machining section 6 into a waiting position 16 so that a tube blank 2 can be moved out of the ready position 10 into a rolling position 17.

In this respect, the Rohrluppeneinstoßer 14 can be opened so that one of the tube blanks 2 can be vorgebeschoben to the plunger 13, although the feed apparatus 7, the mandrel 11 continues to surround.

In this way, in this embodiment advantageously, a loading time of a tube blank 2 can be reduced by at least half the conventional loading times, which can often amount to up to 3 minutes at tube-tube lengths of up to 21 m.

The plunger 13 has a tubular body 18 which has a radial Dornstangeneinführöffnung (not shown) in the direction of its axial longitudinal extent 19.

For radial displacement of the plunger 13, a radial drive is provided in this embodiment on the feed apparatus 7, which can displace the plunger 13 correspondingly radially.

The feed apparatus 7 is also equipped with a rotary drive, not shown here, to rotate the plunger 13 for radial displacement in a corresponding displacement position can, in which the Dornstangeneinführöffnung is directed downwards.

Advantageously, with the feed apparatus 7, a feed path 21 along the axial machining path 6 can be realized which is longer than half the length (not numbered here) of one of the tube bodies 2 and that is at least the length of one of the tube bodies 2. As a result, it is possible in particular to dispense with further feed apparatus, since the feed can be carried out with this single feed apparatus 7, which in particular results in a very uniform drive for the tube blank 2, so that a correspondingly good rolling result can also be realized.

Due to the mandrel bar holder 12, the mandrel bar 11 can remain in front of the planetenschrägwalzwerk 3 in the appropriate inert gas atmosphere, which in particular relieves the mandrel 11 and also the working speed benefits.

The in the FIG. 2 The rolling apparatus 101 shown has substantially the same structure as the rolling apparatus 1 of FIG FIG. 1 ; However, it is supplemented by a rear feed apparatus 130 as well as a second mandrel rod holder in the form of a first holding device 131A for the mandrel rod 111.

Otherwise, the rolling apparatus 101 also has a planetary cross rolling mill 103, which is associated with a feed bed 104 with a tube pulley feed 105 comprising a front feed apparatus 107 and the rear feed apparatus 130.

Starting from the planetary cross rolling mill 103, axially behind the feed bed 104, a tube feed 108 with an axial tube feed conveyor 109 is set up.

By means of the axial tube inflator 109, each of the tube blanks 102 can be conveyed in a ready position 110 to be subsequently pushed along an axial machining path 106 by means of the two feed apparatuses 107 and 130 alternately in the direction of the planetary cross rolling mill 103.

Also, the mandrel bar 111 is held in position by means of a dome rod holder 112 comprising the first holder 131A and a second holder 131B, and the holders 131A and 131B can open respectively as one tube 102 passes, since then the other of the two holders 131A and 131B the mandrel 111 still holds.

Also in this embodiment, the front feed apparatus 107 comprises a Rohrpfuppeneinstoßer 114 with a plunger 113, which can be displaced radially 115 from the axial processing section 106 out into a waiting position 116, and then move one of the tube billets 102 on the plunger 113 in a Walzvorposition 117 to be able to. For the last part of the tube blank 102, which has then already run in large part through the rolling device 101, then the rear feed apparatus 130 is activated.

The tube blanks 102 are conveyed to the feed bed 104 in this further embodiment by means of the axial tube inflator 109 and further driven by means of the front feed apparatus 107 shock in the direction of the rear feed apparatus 130. This rear feeder apparatus 130 engages the respective tube blank 102 and pushes it through the planetary cross rolling mill 103. By means of the front feed apparatus 107, the blank broths 102 are each pushed into the planetary cross rolling mill 103, possibly also a pushed from the front feed apparatus 107 or from the rear feed apparatus 130th pushed tube blank 102 can push a tube blank 102 located behind it.

In this respect, there is a combination of pushing and pushing. Advantageously, thereby a continuous feeding process can be realized.

The tube billets 102 are thus alternately fed to the planetary cross rolling mill 103 by means of the two feeders 107 and 130, the two feeders 107 and 130 having different stroke lengths, and the front advancing apparatus 107 having a forward feed path 121 longer than half the length of one of the tube billets 102 is.

On the other hand, the rear feed apparatus 130 has a rearward feed path 132 different therefrom.

Due to the different feed paths 121 and 132, an available time for axial feeding or axial reloading of a subsequent tube blank 102 can advantageously be extended.

It is understood that the above-described embodiments are only first embodiments of the rolling device according to the invention. In this respect, the invention is not limited to these first embodiments. LIST OF REFERENCE NUMBERS 1 rolling device 101 rolling device 2 tube blanks 102 tube blanks 3 Planetary cross rolling mill 103 Planetary cross rolling mill 4 feed bed 104 feed bed 5 Rohrluppenvorschub 105 Rohrluppenvorschub 6 axial machining distance 106 axial machining distance 7 feeder 107 front feeder 8th Rohrluppenzufuhr 108 Rohrluppenzufuhr 9 axial tube-pulley conveyor 109 axial tube-pulley conveyor 10 Ready position 110 Ready position 11 mandrel 111 mandrel 12 Mandrel rod holder 112 Mandrel rod holder 13 tappet 113 tappet 14 Rohrluppeneinstoßer 114 Rohrluppeneinstoßer 15 radial 115 radial 16 waiting position 116 waiting position 17 Walzvorposition 117 Walzvorposition 18 tubular body 121 front feed path 19 axial longitudinal extent 130 rear feeder 21 feed path 131A first holding device 131B second holding device 132 rear feed path

Claims (11)

1. A device (1; 101) for rolling tube blanks (2; 102) with a planetary crossrolling mill (3; 103), with a feed bed (4; 104), with a tube blank supply (8; 108), with a tube blank feed (5; 105) that pushes the tube blanks (2; 102) from the feed bed (4; 104) through the planetary crossrolling mill (3; 103) and features at least one feed apparatus (7; 107), with a mandrel bar (11; 111) and with a mandrel bar holder (12; 112), wherein the tube blank supply (8; 108) features an axial tube blank supply conveyor (9; 109) that axially transports a tube blank (2; 102) into a pick-up position (10; 110) located axially behind the mandrel bar holder (12; 112), and wherein the feed apparatus (7; 107) is arranged between the planetary crossrolling mill (3; 103) and the mandrel bar holder (12; 112), characterized in that the feed apparatus (7; 107) features a ram (13; 113), by means of which the tube blanks (2; 102) to be rolled can be individually pushed into a roll gap of the planetary crossrolling mill (3; 103) in that the ram (13; 113) engages on a tube blank (2; 102) on buttock and pushes in the tube blank.
2. The device (1; 101) according to Claim 1, characterized in that the ram (13; 113) can be radially (15, 115) displaced.
3. The device (101) according to Claim 1 or 2, characterized in that the mandrel bar holder (112) features at least two holding devices (131A, 131B), wherein a first holding device (131A) is arranged behind the feed apparatus and a second holding device (131B) is arranged in front of the feed apparatus (107).
4. The device (101) according to Claim 3, characterized in that the tube blank feed (105) features at least one additional feed apparatus (107) that is arranged behind the first holding device (131A).
5. The device (1; 101) according to one of Claims 1 to 4, characterized in that the feed apparatus (7; 107) has a feed travel (21; 121) that is longer than half the length of the tube blanks (2; 102).
6. The device (1; 101) according to one of Claims 1 to 5, characterized in that a ram (13; 113) of a tube blank push-in device (14, 114) features a tubular body (18) and the tubular body (18) features a radial mandrel bar insertion opening.
7. The device (1; 101) according to one of Claims 1 to 6, characterized in that a ram (13; 113) of a tube blank push-in device (14, 114) is realized in a u-shaped fashion.
8. The device (1; 101) according to one of Claims 1 to 7, characterized in a radially displaceable ram (13; 113) of the tube blank push-in device (14; 114).
9. The device (1; 101) according to one of Claims 1 to 8, characterized in that a ram (13; 113) of a tube blank push-in device (14, 114) comprises a rotary drive.
10. A method for rolling tube blanks (102) in a planetary crossrolling mill (103), in which the tube blanks (102) are continuously supplied to the planetary crossrolling mill (103) in an abutting fashion, wherein two alternating feed apparatuses (107, 130) push the tube blanks (102) into the planetary crossrolling mill (103), characterized in that the front feed apparatus (130) of the two feed apparatuses (107, 130) pushes the tube blank (2; 102) with a ram (13; 113), by means of which the tube blanks (2; 102) to be rolled can be individually pushed into a roll gap of the planetary crossrolling mill (103) in that the ram (13; 113) engages on a tube blank (2; 102) on buttock and pushes in the tube blank.
11. The method according to Claim 10, characterized in that the two feed apparatuses (107, 130) can be operated with different stroke lengths (121, 132).

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