EP2478978A1 - Upsetting press and upsetting method - Google Patents

Abstract

The method involves moving press tool (2,2') against rolling surfaces (1a,1a') by eccentric cam (3,3') having eccentric axle. Each press tool is mounted on a crimping tool holder (4,4') that is connected to associated eccentric cam, such that eccentric axle is orthogonal to undeformed rolling surfaces guided in translation in rolling surface moving direction. A connecting device (5) is provided with two eccentric cams which are rotatably connected with eccentric axles. An independent claim is included for upsetting method for reducing slab width of rolled stock in hot wide strip mills.

Description

The invention relates to an upsetting press for reducing the width of rolling stock, in particular the slab width in hot strip mills, wherein in each case a pressing tool is movable against two opposite Walzgutseitenflächen and wherein the movement of each pressing tool by means of an associated eccentric, which has a first eccentric axis and a second eccentric axis offset thereto having. In addition, the method relates to a compression method using this upsetting press.

Upset presses for reducing the width of rolling stock are known. They are used, for example, to be able to carry out a comprehensive rolling program with as few starting widths of a slab as possible.

An upsetting press of the type mentioned is from the EP 0 913 214 A2 known. Here acts on each side of the rolling a horizontal eccentric on a pressing tool. Each eccentric is connected to a connecting rod, which is connected by means of a rolling toothing with an intermediate block. This intermediate block is translationally movable in the direction of Walzgutseitenflächen. The upsetting process takes place step by step. The rolling stock is pushed between the open pressing tools and stopped. There is a first compression process and the pressing tools are moved away again translationally from the rolling stock. In open pressing tools, the rolling stock is advanced a bit and a new upsetting process continues the stepwise width reduction.

Also from the JP 2003-025005 is an upsetting press with horizontal eccentrics known. On each side of the rolling stock an eccentric is arranged, which has two Connecting rod and an intermediate block acts on a pressing tool. The intermediate block consists of several parts which are adjustable against each other, so that the clear width between the pressing tools is adjustable.

An arrangement with two vertical eccentrics on each side of the rolling stock is in the DE 39 17 398 A1 disclosed. On each side, two connecting rods are provided with grease-lubricated, balanced connecting rod bearings. The two connecting rods are connected to a common tool holder, on which the pressing tool is arranged. In this case, the pressing tool relative to the tool holder by means of a hydraulic device in the direction of Walzgutvorschubs is displaced. This allows processing of the rolling stock with a continuous feed in the so-called flying mode.

Also in the JP 5-123701A is an upsetting press arrangement for a continuous Walzgutvorschub indicated. The compression force of the respective pressing tool is applied by means of a vertical eccentric and a connecting rod. The connecting rod is connected via a ball joint with a pressing tool holder. On the pressing tool holder acts another connecting rod, which transmits a caused by an additional eccentric feed movement.

The known compression presses comprise eccentrics for converting a rotational movement into a longitudinal movement of the respective pressing tool. Here, connecting rods are used whose number and bearing arrangements vary. The respective kinematics of these arrangements leads within the upsetting press to forces that make special demands on the dimensioning of the individual components, in particular the bearings.

The invention is based on the object for an upsetting press of the type mentioned an improvement in relation to the state of the art. In particular, the burden of upsetting press components is to be improved and a compact construction is to be created.

According to the invention this object is achieved by an upsetting press according to claim 1 and a compression method according to claim 11. Further developments of the invention are specified in the dependent claims.

In this case, each pressing tool is attached to a pressing tool holder, which is rotatably connected to the associated eccentric about the first eccentric axis, each first eccentric orthogonal to the undeformed (raw) Walzgutseitenfläche is guided translatorisch in Walzgutseitenfläche and wherein a connecting device is provided which with the two Eccentric rotatably connected to the second eccentric axis. The connecting device is designed to be substantially rigid, so that the distance between the two second eccentric axes remains constant during an upsetting operation. A rotational movement of the eccentric thus leads to the second eccentric axes perform an up and down movement, while the first eccentric axes back and forth normal to Walzgutvorschubrichtung. This reciprocating movement of the first eccentric axes and thus of the two pressing tools is essentially the same. The pressing tools move simultaneously to the rolling stock and compress this to a reduced width. After a compression process, the pressing tools move apart again.

The kinematics of the upsetting press according to the invention obviates the need for a connecting rod because no eccentric axis is fixed in its position. The only fixation is made by the translational guidance of the first eccentric axes. In this way, a compact design is specified, which causes easily controllable forces within the assembly. It is advantageous if, for translational guidance of each first eccentric axis, the respective eccentric is rotatably connected to the first eccentric axis with a translationally mounted carriage. On both sides of the rolling stock, in each case such a slide is provided, wherein the storage takes place by means of rollers, which are preferably guided in common rails. The respective carriage is easy to design and only carries the weight of the arrangement. The actual compression forces are absorbed by the flying connection arrangement.

Each carriage is advantageously connected to a traction device or pressure device, which causes a tensile force or compressive force in the direction of the translational movement. Thus, the entire kinematics biased so that the position of the moving parts is always clearly defined independently of existing bearing clearance. In addition, the traction devices with the carriage form a balance system, which determines the relative position of the pressing tools for the rolling stock.

For an upsetting operation with a continuous rolling stock feed, it is advantageous if each pressing tool holder can be moved back and forth in the axial direction of the associated eccentric. This additional movement is synchronized with the feed movement of the rolled stock to be upsized. The pressing tools move during a compression process with the rolling stock. The corresponding feed drive is either derived from the main drive of the respective eccentric or designed as a separate drive.

For upsetting different rolling stock widths, the distance between the open rolling tools, the clear width, must be adjustable. This is advantageously done by each pressing tool holder has a base body, which is rotatably connected to the associated eccentric about the first eccentric axis, wherein on the base body a pressing tool receptacle is attached, which is adjustable relative to the base body in the direction of the respective Walzgutseitenfläche. Thus, the average distance between the pressing tools during a compression process is independent of the adjustability of the connecting device fixable. During a swaging operation, the setting remains essentially unchanged. Only to compensate Tolleranzen or for applying a contour, a slight distance adjustment can take place during a compression process. For example, it may be necessary to choose the remaining after a swaging operation width of a rolled material at the front and rear ends larger than in the middle. This leads to a more uniform width of the finished rolled product.

Another possibility for adjusting the distance between the two pressing tools is given when the connecting device is constructed of a plurality of mutually adjustable parts, so that the distance between the two second eccentric axes is adjustable. A setting of the distance takes place between the upsetting processes. During a swaging operation, the connecting device remains substantially rigid. A slight adjustment, if necessary, to compensate Tolleranzen or to apply a contour. An adjustment of the pressing tool holder can thus be omitted.

In a simple embodiment of the upsetting press, each eccentric has a cylindrical central section concentric with the first eccentric axis and two cylindrical end sections concentric with the second eccentric axis. The respective central portion is connected to the associated pressing tool holder and the connecting device comprises two connecting units, which connect two opposing end portions with each other. In Roll feed direction are thus seen in each case the front end portions of the two eccentrics and the rear end portions of the two eccentrics connected to each other. Thus, the arrangement is particularly compact. In addition, the dimensioning is simplified because the compression force is divided between the two connection units.

Conveniently, each connection unit has a first bearing bush for rotatable connection with the one eccentric and a second bearing bush for rotatable connection with the other eccentric. The first bearing bush and the second bearing bush are rigidly connected to a top linkage extending above the rolling stock and a lower linkage extending below the rolling stock. The tensile force in the respective connection unit is divided between the upper and the lower linkage, whereby bending stresses are largely avoided.

To adjust the distance between the two second eccentric axes, each linkage is screwed to the respective bearing bush in a simple embodiment, wherein two opposite bearing bushes have diametrically opposite threads. Linkage and bushings form a spindle assembly.

Furthermore, it is advantageous if each eccentric is connected to its own drive or via a common transfer shaft. The averaged distance between the dies during an upsetting operation remains constant when the two drives are operated synchronously. A deviation from this can be used to bring about a slight change in the mean distance between the pressing tools. This facilitates the application of a contour on the rolling stock. In addition, an adaptation to slight differences in the Walzgutausgangsbreite is possible.

The compression method according to the invention provides that for performing a press cycle each eccentric is rotated a full revolution about an eccentric axis, that while the first eccentric axis is translationally moved in the orthogonal direction to undeformed (raw) Walzgutseitenfläche and that at the same time the second eccentric axis on and Downward movement performs. A pressing cycle begins with the movement of the respective pressing tool to the rolling stock, continues with the actual upsetting process and ends with the return of the pressing tool to the starting position. The maximum stroke of the pressing tool corresponds in principle to twice the distance by which the first eccentric axis is offset from the second eccentric axis. A reduction of the stroke can be achieved by adjusting the phase angle of the two eccentrics to each other.

In advantageous embodiments, an adjustment of the stroke is also possible by the adjustment of the connecting device and / or the two pressing tool holder, with a corresponding control is provided.

Advantageous is a compression method in the flying mode, in which each pressing tool holder is moved back and forth in the axial direction of the associated eccentric, wherein this movement is synchronized during a Walzgutkontakts with a uniform feed rate of the rolling stock. As long as the respective pressing tool is in engagement with the rolling stock, it moves with it.

To adapt to different output widths of the rolling stock, it is advantageous if, between two upsetting operations, the connecting device is adjusted in such a way that the distance between the second eccentric axes increases or decreases.

Fig. 1

Stauchpressenaufbau im Schrägriss

Fig. 2

Kinematische Anordnung im Schrägriss

Fig. 3

Stauchpressenaufbau in einer Aufsicht

The invention will now be described by way of example with reference to the accompanying drawings. In a schematic representation:

Fig. 1

Upsetting press assembly in oblique gripping

Fig. 2

Kinematic arrangement in oblique position

Fig. 3

Upsetting press assembly in a supervision

As in Fig. 1 illustrated the upsetting press comprises two press units, which are constructed essentially mirror-inverted. Each pressing unit has a pressing tool 2 or 2 ', which are movable against the side surfaces 1a and 1a' of a rolling stock 1. This movement is carried out by means of an eccentric 3 or 3 ', wherein within a pressing unit each pressing tool 2 or 2' is assigned a horizontally arranged eccentric 3 or 3 '. The respective eccentric 3 or 3 'has a first eccentric axis 3 ₁ or 3 ₁ ' and a second eccentric axis 3 ₂ or 3 ₂ 'offset by half the maximum pressing tool stroke H. The two eccentric axes 3 ₁ , 3 ₂ and 3 ₁ ', 3 ₂ ' are aligned parallel to the feed direction v of the rolling stock 1.

Essential for the present invention is a translational guidance of the first eccentric axes 3 ₁ , 3 ₁ '. In this case, the respective eccentric 3 or 3 'with an associated pressing tool holder 4 or 4' to the first eccentric axis 3 ₁ and 3 ₁ 'rotatably connected. The translational guidance takes place orthogonal to the rolling stock feed direction v in the direction of the respective rolling stock side surface 1a or 1a ', so that the pressing tool holders 4, 4' and the pressing tools 2, 2 'attached thereto move horizontally towards one another during an upsetting operation. The translational guidance is implemented, for example, by means of two carriages 6, 6 ', which have a corresponding linear bearing. Simply, each eccentric 3 or 3 'about the first eccentric axis 3 ₁ or 3 ₁ 'rotatably connected to a carriage 6 and 6'. Each carriage 6 or 6 'has rollers, which are guided in rails, not shown. In order to avoid bearing games lead to undefined arrangement positions, the entire assembly is biased. For this purpose, each carriage 6 and 6 'connected to a pulling device 7 and 7'. It is largely irrelevant whether the biasing forces to each other or against each other. An additional function of the traction devices 7, 7 'is to keep the arrangement in balance to the position of the rolling stock 1. This balancing system is controlled by means of a suitable control, so that on the one hand, the bias and the position of the arrangement with respect to the rolling stock 1 is maintained and on the other hand, the compression movement of the press units is not hindered.

The application of an upsetting force F _s is effected by a rotation of the respective eccentric 3 or 3 'about an eccentric axis, the two second eccentric axes 3 ₂ and 3 ₂ ' being essentially rigidly connected to a connecting device 5. During a rotation of the eccentrics 3, 3 ', this connecting device 5 causes its second eccentric axes 3 ₂ , 3 ₂ ' to move vertically up and down together with the connecting device 5.

Functionally, it makes no difference how the individual cylindrical sections of each eccentric 3 or 3 'are composed. Each eccentric 3 or 3 'consists of at least two parallel aligned cylinders, wherein the first cylinder axis of the first eccentric axis 3 ₁ or 3 ₁ ' and the second cylinder axis of the second eccentric axis 3 ₂ and 3 ₂ 'corresponds. In order to simplify the mounting of the eccentric 3 or 3 ', it makes sense to assemble each eccentric 3, 3' from a plurality of staggered cylinders.

With three cylinders per eccentric 3 or 3 'is a cylindrical central portion with a first cylinder axis in the middle and on both sides shoots in each case a cylindrical end portion with a second cylinder axis. The assignment of the cylinder axes is basically freely selectable, so that the respective press tool holder 4 or 4 'is either rotatably connected to the central portion or with the two outer end portions of the eccentric 3 and 3'. It is essential, however, that the eccentric section rotatably connected to the pressing tool holder 4 or 4 'is guided horizontally in the orthogonal direction to the rolling stock feed direction v.

An advantageous compact design provides that each eccentric 3 or 3 'is composed of three cylinders and that the central portion is rotatably connected to the respective pressing tool holder 4 or 4' and rotatably connected to the respective carriage 6 and 6 '. The cylinder axis of the central portion thus corresponds to the first eccentric axis 3 ₁ or 3 ₁ '. The two end portions of each eccentric 3 and 3 'are rotatably connected to the connecting device 5. Each eccentric 3 or 3 'has on one end face a coupling device 8 or 8' for applying a torque M or M '.

While a rolling stock 1 is fed in the feed direction v, the pressing tools 2, 2 'are open. The clear width c between the pressing tools 2, 2 'is slightly larger than the starting width b _{1 of} the rolling stock 1. As soon as the front end of the rolling stock 1 passes between the pressing tools, the first upsetting process begins. In a simple embodiment while the feed movement of the rolling stock 1 is stopped.

It is advantageous if the rolling stock 1 is moved on with a constant feed and the pressing tools 2, 2 'move in synchronism with it in the feed direction v. Such a flying mode is simply by an axial reciprocating movement of the respective pressing tool holder 4th or 4 'realized on the central portion of the respective eccentric 3 or 3'. This extra movement is in Fig. 3 indicated by arrows. A corresponding drive is either derived from the main drive or arranged as an independent, in particular hydraulic drive.

In order to process rolling stock 1 different width, an adjustment of the clear width c between the open pressing tools 2, 2 'is provided. For example, each pressing tool holder 4, 4 'composed of several mutually adjustable parts. A base body is rotatably connected to the respective eccentric 3 or 3 'around the first eccentric axis 3 ₁ or 3 ₁ '. A pressing tool receptacle, which is preferably connected thereto by means of hydraulic cylinders, carries the actual pressing tool 2 or 2 '. This embodiment, not shown, allows a preferably hydraulic adjustment of the clear width c in a non-adjustable connection device 5 and an overload protection.

For a compact construction, it makes sense to provide an adjustable connection device 5. For this purpose, the connecting device 5 is constructed in several parts, wherein the individual parts are normal to the feed direction v of the rolling stock 1 mutually adjustable. In this way, a large Walzgutbreitenbereich can be covered.

In the in Fig. 2 illustrated advantageous embodiment of the upsetting press, the connecting device 5 consists of two connecting units 5 _v , 5 _h . Seen in the feed direction v connects a front connecting unit 5 _v, the front end portions of the two eccentrics 3, 3 '. A rear connection unit connects the rear end portions of the two eccentrics 3, 3 '. Each connection unit 5 _v or 5 _h consists of two bearing bushes 5 _Bv , 5 _Bv 'and 5 _Bh , 5 _Bh ', which are interconnected. Each connection consists of a above the rolling stock 1 extending linkage 5 _Gvo , or 5 _Gho and a below the rolling stock 1 extending linkage 5 _Gvu or 5 _Ghu . The adjustability of the connecting device 5 is realized for example with nuts arranged in the bearing bushes and the rods 5 _Gvo , 5 _Gho , 5 _Gvu , 5 _{Ghu screwed therein} . In this case, each with a bearing bush 5 _Bv or 5 _Bv 'or 5 _Bh or 5 _Bh ' connected linkage 5 _Gvo , 5 _Gho , 5 _Gvu , 5 _{Ghu is provided} at its free end with an external thread. The two ends of the respective linkage 5 _Gvo or 5 _Gho or 5 _Gvu or 5 _Ghu have opposite threads. An adjustment of the connecting device 5 is carried out in a simple manner by a synchronous rotation of all rods. For this purpose, corresponding drives are connected to a suitable controller.

Before each rolling treatment, the upsetting press is adjusted to the Walzgutbreite b ₁ by means of the adjustment mechanism described. The distance a between the two second eccentric axes 3 ₂ , 3 ₂ 'determines the clear width c of the open pressing tools 2, 2'.

In Fig. 3 are shown in a supervision, the forces acting. In addition, the individual bearings are shown. Hydrodynamic bearings are preferably used in axially displaceable bearings (L ₃₄ , L _{34 '} ). Otherwise, rolling bearings are advantageously provided.

The compression press reduces the output width b _{1 of} the rolling stock 1 to a compressed width dimension b ₂ . In the feed direction seen v acts left and right in each case a compressive force F _s on the rolling stock 1. In a flying mode moves on each side of the die 2 and 2 'during a swaging operation not only transversely to the feed direction V, but also in synchronism with the rolling 1 in the feed direction v. These two movements are coordinated so that the pressing tools 2, 2 'move in contact with the rolling stock 1 with this. As soon as the pressing tools 2, 2 'are lifted off the rolling stock 1, an axial return movement takes place counter to the feed direction v in an initial position for the next upsetting cycle.

Each press tool holder 4 or 4 'is connected via a bearing L ₃₄ and L ₃₄ ' to the central portion of the corresponding eccentric 3 and 3 '. The respective bearing L ₃₄ or L ₃₄ 'on the one hand allows the rotational movement about the respective first eccentric axis 31 and 3'1 and also an axial longitudinal movement in the feed direction v.

The middle section of the respective eccentric 3 or 3 'is also connected "rotatably" to the associated slide 6 or 6 via further bearings L ₃₆ and L _36. Conveniently, one bearing L is on each side of the respective press tool holder 4 or 4' ₃₆ and L ₃₆ "arranged, wherein for the longitudinal movement of the pressing tool holder 4 and 4 'sufficient distance between the bearings L ₃₆ and L ₃₆ " must be present.

The radially offset end portions of each eccentric 3 and 3 'are each connected by means of a radial bearing L ₃₅ and L ₃₅ ' to the connection assembly 5. By means of this connection arrangement 5, the distance a between the second eccentric axes 3 ₂ , 3 ' ₂ remains substantially constant during an upsetting operation. Slight changes in distance, for example by a phase shift in the rotational movements of the two eccentrics 3, 3 ', can serve to apply a rolling stock contour.

Each eccentric 3 or 3 'is connected via a coupling device 8 or 8' with its own rotary drive, which applies the respectively required torque M or M '. The respective torque M or M 'is converted by means of eccentric 3 or 3' into an upsetting force F _s . In the connecting device 5 and in the connecting bearings L ₃₅ , L ₃₅ 'with the respective eccentric 3 and 3', the opposing forces F _h , F _{v act} , with the opposing forces F _h , F _v and the Cancel compression forces F _s within the eccentric connector assembly. On the carriage 6, 6 'so no compression forces F _{s act} .

Claims (12)

Upsetting press for reducing the width of rolling stock (1), in particular slab width (b ₁ ) in hot strip mills, wherein in each case a pressing tool (2, 2 ') is movable against two opposed rolling side surfaces (1a, 1a') and wherein the movement of each pressing tool ( 2, 2 ') by means of an associated eccentric (3, 3'), which has a first eccentric axis (3 ₁ , 3 ' ₁ ) and a second eccentric axis offset thereto (3 ₂ , 3' ₂ ), characterized in that each Pressing tool (2, 2 ') on a pressing tool holder (4, 4') is mounted, which is rotatably connected to the associated eccentric (3, 3 ') about the first eccentric axis (3 ₁ , 3' ₁ ) that each first eccentric axis (3 ₁ , 3 ' ₁ ) orthogonal to the undeformed Walzgutseitenfläche ( _{1 a} , _{1 a} ') is translationally guided and that a connecting device (5) is provided, which with the two eccentrics (3, 3 ') respectively about the second eccentric axis (3 ₂ , 3 ' ₂ ) is rotatably connected. Upset press according to claim 1, characterized in that for translational guidance of each first eccentric axis (3 ₁ , 3 ' ₁ ) of the respective eccentric (3, 3') about the first eccentric axis (3 ₁ , 3 ' ₁ ) rotatable with a translationally mounted carriage (6, 6 ') is connected. Upsetting press according to claim 2, characterized in that each carriage (6, 6 ') is connected to a pulling device (7, 7') or pressure device, which effects a tensile force or compressive force in the direction of the translatory movement. Compression press according to one of claims 1 to 3, characterized in that each pressing tool holder (4, 4 ') in the axial direction of the associated eccentric (3, 3') back and forth. Squeezing press according to one of claims 1 to 4, characterized in that each pressing tool holder (4, 4 ') has a base body which rotatably connected to the associated eccentric (3, 3') about the first eccentric axis (3 ₁ , 3 ' ₁ ) is and that on the main body a pressing tool holder is attached, which is opposite the main body in the direction of the respective Walzgutseitenfläche (1a, 1a ') adjustable. Upset press according to one of claims 1 to 5, characterized in that the connecting device (5) is constructed of a plurality of mutually adjustable parts, so that the distance (a) between the second eccentric axes (3 ₂ , 3 ' ₂ ) is adjustable. Compression press according to one of claims 1 to 6, characterized in that each eccentric (3, 3 ') has a cylindrical central portion concentric with the first eccentric axis (3 ₁ , 3' ₁ ) and two cylindrical end portions concentric with the second eccentric axis (3 ₂ , 3 ' ₂ ), that the respective central portion with the associated pressing tool holder (4, 4 ') is connected and that the connecting device (5) comprises two connecting units (5 _v , 5 _h ), which each connect two opposite end portions. Compression press according to claim 7, characterized in that each connection unit (5 _v , 5 _h ) a first bearing bush (5 _Bv , 5 _Bh ) for rotatable connection with the one eccentric (3) and a second bearing bush (5 _Bv ', 5 _Bh ' ) for rotatable connection with the other eccentric (3 ') and that the first bearing bush (5 _Bv , 5 _Bv ') and the second bearing bush (5 _Bh , 5 _Bh ') with a above the rolling stock (1) extending upper linkage ( 5 _Gvo , 5 _Gho ) and a below the rolling stock (1) extending lower linkage (5 _Gvu , 5 _Ghu ) are rigidly connected. Compression press according to one of claims 1 to 8, characterized in that each eccentric (3, 3 ') is connected to its own drive or via a common transfer shaft. Upset method for reducing the width (b ₁ ) of rolling stock (1), in particular the slab width (b ₁ ) in hot baths by means of an upsetting press according to one of claims 1 to 9, characterized in that for performing a pressing cycle each eccentric (3, 3 ' ) a complete revolution about an eccentric axis (3 ₁ , 3 ' ₁ or 3 ₂ , 3' ₂ ) is rotated, that thereby the first eccentric axis (3 ₁ , 3 ' ₁ ) translationally in the orthogonal direction to the undeformed Walzgutseitenfläche ( _{1 a} , _{1 a} ') is moved and that at the same time the second eccentric axis (3 ₂ , 3' ₂ ) performs an upward and downward movement. Compression method according to claim 10, characterized in that each pressing tool holder (4, 4 ') in the axial direction of the associated eccentric (3, 3') back and forth reciprocally, wherein this movement is synchronized during a Walzgutkontakts with a uniform feed rate of the rolling stock. Compression method according to claim 10 or 11, characterized in that between two upsetting operations, the connecting device (5) is adjusted in such a way that the distance (a) between the second eccentric axes (3 ₂ , 3 ' ₂ ) increases or decreases.

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