EP0484783B1 - Device for bracing and balancing the press tool holder and crankcase in an upsetting press - Google Patents

Abstract

For bracing and balancing the press tool holder and crank case in an upsetting press for reducing the width of rolling stock, in particular for reducing the width of slabs in hot wide strip roughing trains with tool holders which are arranged at both edges of the slab, receive press tools and can be moved in the direction of slab reduction with the aid of a crank drive, a device with the following features is proposed: a linkage mounted in articulated fashion and passed through the crank case 9 engages approximately centrally on the tool holder 8; two further, outer linkages 14, 14' mounted in articulated fashion on the crank case 9 at a distance from the central linkage 13 also engage, the central linkage 13 and the two outer linkages 14, 14' being connected to bracing devices 15, 16, 16' subjecting the linkages to tension; these bracing devices, for their part, are firmly connected to the crossbeam 17 of the housing uprights 6 of the upsetting stand 1. <IMAGE>

Description

The invention relates to an upsetting press for reducing the width of rolling stock, in particular for reducing the slab width in hot wide strip roughing mills, with pressing tools carriers arranged on both sides of the rolling stock edge and which can be moved in the direction of the rolling stock reduction with the aid of a crank mechanism.

In a flying compression press according to the generic DE-A-39 17 398 (& EP-A-0400398), to reduce the width of slabs in a hot wide strip roughing mill, pressing tools are arranged on both sides of the slab edge, which are received by tool carriers. To form a reduction drive, each pressing tool with the associated tool carrier is moved with the aid of a steering system actuated by a crank mechanism in the direction of reducing the width of the slab, the crank mechanism being arranged in a crankcase. The crank mechanism consists of two driven eccentric shafts; A connecting rod is mounted on each eccentric shaft; the connecting rod head is connected to the tool carrier for transmitting the compression forces. A feed drive acting essentially in the direction of the slab feed acts on the tool carrier. Through these measures, the movement of the pressing tools for the reducing Pressing and for the advancement of the pressing tools can be controlled separately from one another, so that synchronization of the movement of the pressing tools with the movement of the slab to be pressed laterally is ensured for any feed size. This upsetting press enables the width of the slab to be continuously reduced to values specified by rolling technology. The plain bearing between the connecting rod head and the tool carrier as well as the roller bearings of the eccentric shafts are exposed to high loads and must be designed as free of mechanical play as possible due to the superimposed reduction and feed movement of the pressing tools and due to the high pressing forces.

From the European patent application EP-A-0 224 333 a press for reducing the width of warm slabs is known, in which the tool holder receiving the pressing tool is moved on both sides against the slab edge by a crank mechanism. The tool carrier is held by two parallel punches, which are rotatably guided in a traverse by means of a thread. The stamps are rotated by a worm gear arranged on the outside. The traverse is connected to two connecting rods of an eccentric shaft. With this construction, the distance between the pressing tools and the slab edge of slabs of different widths is to be adjusted without relocating the crank mechanism consisting of the eccentric shaft and connecting rod. No measures are provided to avoid the mechanical play occurring in the thread guide or in the bearings of the eccentric shaft. Constructional measures for balancing the pressing forces are not provided.

The object of the invention is to develop the compression press described at the outset, in particular design measures for bracing tool carriers and crankcase and a balancing of the crankcase on the compression frame, with which the slide bearings between the connecting rod head and the tool carrier as well as the roller bearings are as free of play as possible in any load condition of the compression press and are evenly resilient.

This object is achieved with the measures of claim 1. The subject matter of claims 2 to 9 serve to further develop the invention.

The upsetting press according to the preamble of claim 1 is characterized in that, for bracing and balancing the pressing tool carrier and the crankcase on the tool carrier, an articulated linkage guided through the crankcase engages approximately in the middle, that at a distance from the central linkage two outer linkages articulated on the crankcase attack and that the central linkage and the outer linkage are connected to such the linkage tensile tensioning devices, which in turn are firmly connected to the crossbar of the uprights of the compression frame. With this measure, the tool carrier is first braced against the connecting rod heads of the crank mechanism, so that any mechanical play in the slide bearing between the connecting rod head and the tool carrier is removed, even in the relieved movement phase, in which the pressing tool is pressed away from the slab edge after pressing is moved. The tensioned center linkage also causes a certain load on the roller bearings of the eccentric shafts of the crank mechanism, so that any mechanical play that may be present is also removed from these roller bearings, even in the unloaded movement phase of the pressing tools when they are moved back from the slab edge. These measures reduce mechanical noise and prevent premature wear the storage. Furthermore, with the help of the outer linkage and the associated tensioning devices, the crankcase is firmly clamped to the crossbar of the compression frame, so that all reaction forces emanating from the pressing process are uniformly introduced into the compression frame of the press. The play in the mechanical adjustment, in particular the play in the pressure spindle and in the pressure bearing, is also removed.

To develop the invention, it is provided that the central linkage has a circular guide movably arranged in the crankcase, that on the one hand a pull rod mounted in articulated eyes is arranged on the tool carrier and the round guide and that on the other hand an elastic tracking device of the movement of the tool carrier engages in an articulated manner, which is firmly connected to the crossbeam of the uprights. As a result, the central rod of the superimposed movement of the pressing tool and the tool carrier can be tracked in the direction of advance of the slab and in the direction of reduction perpendicular thereto, and the tensile forces required for the play-free connection of the tool holder and the connecting rod head and for the play-free mounting of the eccentric shafts can be directly in any movement position of the press tool Crossbar of the scaffold stand are included.

A particularly advantageous embodiment of the invention is that the tensioning device for the central linkage is a piston-cylinder unit with a pressure accumulator that can be acted upon twice with a hydraulic pressure medium, the piston rod of which is enclosed in an articulated eye provided on the round guide and provided with a ball socket, and the cylinder of which Contact element and support plate is supported on the crossbar. This can ensure that with With the help of the center linkage constant tensile forces are applied to the tool carrier. The pressure accumulator also enables controllable adaptation of the tensile forces to the movement of the press tool. It is expedient that the piston-cylinder unit assigned to the central linkage has a control device for the tensile forces applied, which is dependent on the drive of the crank mechanism.

For a perfect guidance of the central linkage in the crankcase, it is proposed according to a further construction of the invention that the circular guidance in the crankcase is guided in a slide bushing, which can preferably be supplied with a lubricant.

With further measures, in particular for force-balancing the structural unit consisting of the crankcase, crank mechanism, tool carrier and pressing tool within the compression frame of the press, it is proposed that each outer linkage be equally spaced from the central linkage and that the outer linkage also doubles the piston rod one with a hydraulic pressure medium acted upon piston-cylinder unit, wherein the piston rod is framed in an articulated eye arranged on the crankcase and provided with a ball socket and wherein the cylinder is supported on the crossbar by means of contact element and support plate. As a result, a gimbal-type connection between the crankcase and the piston rod is hereby established, so that pure tensile forces act on the crankcase without bending load components, which is crucial for a safe balancing of the forces. As a result of the central linkage being attached to the fixed crossbar of the compression frame, the mechanical adjustment of the crankcase is already largely balanced. The still If the mechanical adjustment is not balanced, the two hydraulic cylinders on the outside are then used. It is expedient here that the piston-cylinder unit assigned to each outer linkage has an actively actuable control device with which the mechanical adjustment of the crankcase can be balanced.

It is further proposed that with the aid of the piston-cylinder unit of each outer linkage, the crankcase, the crank mechanism and at least the tool carrier can be moved as one structural unit into the assembly or disassembly position. The assembly or disassembly position is predetermined by the arrangement of the rail arrangement running transversely between the uprights and on one side of the uprights, on which the structural unit can be moved out of the compression frame onto the construction site. For the purpose of quick disassembly or assembly of the structural unit, in particular the crankcase from / with the central linkage and from / with the two outer linkages, it is proposed that each joint eye of the central linkage or outer linkage be arranged in a holder which can be detached from the crankcase, preferably by means of pins and bolts .

Figur 1

einen Horizontalschnitt durch eine Stauchpresse,

Figur 2

die zwischen Preßwerkzeugträger und Kurbelgehäuse in Gelenkaugen gelagerte Zugstange,

Figur 3

die Anordnung von Mittengestänge und Außengestänge zwischen Kurbelgehäuse und Quertraverse des Stauchgerüsts.

The upsetting press according to the present invention is described in more detail below using an exemplary embodiment. Show it:

Figure 1

a horizontal section through an upsetting press,

Figure 2

the pull rod, which is mounted in the eyes between the press tool carrier and the crankcase,

Figure 3

the arrangement of central linkage and outer linkage between the crankcase and crossbar of the compression frame.

Fig. 1 shows the horizontal section through the overhanging upsetting press 1 for reducing the width of slabs 2 in a hot wide strip roughing mill, the slabs being fed almost continuously from a slab casting plant upstream of the upsetting press but not shown in detail. Driver rollers 3, 4 are arranged in front of the upsetting press and behind the upsetting press. The slab 2 passes through the slab crushing stand in the with point. 5 provided direction of movement. The upsetting press has scaffold stands 6. A crankcase 9 can be set in the upsetting frame of the upsetting press between its scaffolding stands.

Pressing tools 7 are arranged in pressing tool carriers 8 on both sides of the slab 2. The press tool and the press tool carrier have one in the normal direction, i.e. perpendicular to the slab 2 acting as a crank drive reduction drive 10 and in the tangential direction, ie parallel to the slab 2 feed drive 11. The crank drive is formed by each pressing tool carrier 8 with the aid of a handlebar system operated by two eccentric shafts 12 and containing two connecting rods 22, is essentially movable in the direction of the slab to be reduced in width. The feed drive 11, which acts essentially in the direction of the slab feed, engages on the pressing tool carrier 8 and is supported on the crankcase 9, in which the two eccentric shafts 12 are mounted.

For tensioning and balancing the press tool carrier 8 and crankcase 9 on the compression frame 6 of the press 1 and for moving the press tool carrier essentially 8, crank mechanism 10, and crankcase 9 existing unit engages on the press tool carrier an articulated rod 13 guided by the crankcase 9 in the middle and at a distance from this central linkage engage the crankcase 9 with two more articulated outer rods 14, 14 ', the Center linkage 13 and the outer linkage 14, 14 'with such the linkage tensile tensioning devices 15, 16 are connected, which in turn are firmly connected to the crossbar 17 of the uprights 6 of the compression frame 1.

Fig. 2 shows an enlarged section - partly in section - of the arrangement of the tie rod 18 as part of the central rod. The pull rod is mounted on a projection 19 of the pressing tool carrier 8 in an articulated eye 20. The other end of the pull rod is mounted in a further articulated eye 20 ', which is connected to a circular guide 21 which is arranged in the crankcase to be longitudinally movable. The pull rod 18 is located centrally between the connecting rods 22, which rotate about the eccentricity 24 on the eccentric shafts 12 mounted in roller bearings (not shown). The connecting rod heads 25 are seated in slide bearing half-shells 26, which are molded into the press tool carrier 8. The pins 27, 27 'of the hinge eyes 20, 20' of the pull rod 18 are mounted in a ball socket, not shown here. The other end of the round guide 21 is provided with a further articulated eye 29, which is part of a holder 23, the holder being screwable to the round guide.

In FIG. 3, in continuation of FIG. 2, the circular guide 21 arranged in the crankcase can be seen, and that this circular guide is surrounded by a sliding bush 28 which can be supplied with lubricant. On the joint eye 29, the second section of the central linkage 13 is attached. This section is also the piston rod 31 of a piston-cylinder unit 32, which is provided with a pressure accumulator, not shown, which can be integrated in this unit, for example, as a gas pressure accumulator. The cylinder 33 of the unit 32 is supported on the crossbar 17 with the aid of a contact element 34 and a support plate 35. The crossbar consists of a plate welded construction in which the piston-cylinder unit 32 is arranged. Via the pull rod 18, the round guide 21 and the piston rod 31, the tool carrier 8 is pulled rearward against the cross member of the compression frame and the pressure accumulator of the piston-cylinder unit 32 acts on the pressing tool carrier 8 like a prestressed spring. As a result of these design measures, the connecting rod heads 25 are guided without play in the slide bearing half-shell and, moreover, the play in the roller bearings of the eccentric shafts 12 is removed. All bearings are therefore free of play. As a result of the attachment of the center linkage 13 to the fixed crossbar 17 of the compression frame, the mechanical adjustment 30 of the crankcase is also partially balanced. In addition, the mechanical play is removed from the pressure spindles 45 and from the thrust bearings 46 of the mechanical adjustment using the outer linkage.

The crankcase 9 is also balanced with the aid of the two outer rods 14, 14 ', which are at the same time the piston rods 36, 36' of two piston-cylinder units 37, 37 'which can be pressurized with a pressure medium. The cylinders 38, 38 'of these units are supported by means of the contact elements 34', 34 'and by means of the support plate 35 on the crossbar 17 of the compression frame and are arranged in the plate construction of this crossbar. All piston-cylinder units are provided with a feed line 39 and a discharge line 40 for the pressure medium. The hinge eyes 41, 41 'of the outer linkage 14, 14' are arranged in a holder 42, 42 'which are releasably connected to the crankcase by means of pins 43, 43' and bolts 44, 44 '. The hinge eyes 41, 41 'of the outer linkage 14, 14' are gimbal-mounted. The piston-cylinder unit assigned to the center linkage has a control device for the applied tensile forces which is dependent on the drive of the crank mechanism, which is not shown here, nor is the control device assigned to each outer linkage and the associated piston-cylinder unit active for balancing the mechanical adjustment of the crankcase.

If the unit consisting essentially of pressing tool carrier 8, crank mechanism 10, and crankcase 9 are withdrawn from the stand of the upsetting press, this unit is first of all from the piston-cylinder units 37, 37 'of the outer linkage 14, 14' to a disassembly position X moved after the central linkage has been released from the circular guide. The assembly or disassembly position X is predetermined by the position of the rail arrangement on which this structural unit is to be moved transversely to the longitudinal axis of the upsetting press to a construction site. In the disassembly or assembly position X, the bolts 44, 44 'from the pin 43, 43' of the bracket 42, 42 'are removed so that the structural unit (crankcase, crank mechanism, press tool carrier) is detached from the central linkage and the two outer linkages and is thus freely movable in the transverse direction.

With the measures described above, a device is created which surprisingly fulfills several functions side by side, namely the positioning of the pressing tools on the different widths of the slab, the tensioning and balancing of the pressing tool carrier and the crankcase in the compression frame of the compression press and the assembly or Disassembly of crankcase, crank mechanism and tool carrier.

Reference symbol overview

1

Upset press

2nd

Slab

3, 4

Driver roles

5

Direction of movement

6

Stand / scaffold stand

7

Press tool

8th

Press tool carrier

9

Crankcase

10th

Crank mechanism

11

Feed drive

12th

Eccentric shaft

13

Center linkage

14, 14 ′

Outer linkage

15

Clamping device

16, 16 ′

Clamping device

17th

Crossbar

18th

pull bar

19th

head Start

20, 20 ′

Joint eye

21

Tour

22

Connecting rod

23

bracket

24th

eccentricity

25th

Connecting rod

26

Plain bearing half-shell

27, 27 ′

Cones

28

Sliding sleeve

29

Joint eye

30th

mechanical adjustment

31

Piston rod

32

Piston-cylinder unit

33

cylinder

34, 34 ′, 34 ′ ′

Investment element

35

Support plate

36, 36 ′

Piston rod

37, 37 ′

Piston-cylinder unit

38, 38 ′

cylinder

39

Supply line

40

Discharge line

41, 41 ′

Joint eye

42, 42 ′

bracket

43, 43 ′

Cones

44, 44 ′

bolt

45

Pressure spindle

46

Thrust bearing

Claims (9)

1. Upsetting press (1) for width reduction of rolled stock, in particular for the reduction of the slab width in wide hot strip roughing trains, with press tool carriers (8), which are arranged on both sides of the rolled stock edge and receive press tools (7) and which are movable with the aid of a crank drive (10), in the direction of the reduction of the rolled stock, characterised thereby, that for the bracing and balancing-out of the press tool carrier (8) and the crankcase (9) at the edging stand, an articulatedly borne linkage (13), which is led through the crank-case (9), engages about centrally at the press tool carrier (8), that two outer linkages (14, 14′), which are articulatedly borne at the crankcase (9), engage at a spacing from the middle linkage (13) and that the middle linkage (13) as well as the outer linkages (14, 14′) are connected with such tightening equipments (15, 16, 16′) as load the linkages in tension and are in their turn firmly connected with the crossbeam (17) of the housing posts (6) of the edging stand.
2. Upsetting press according to claim 1, characterised thereby, that the middle linkage (13) displays a round guide (21) arranged to be movable in the crankcase (9), that a pull rod (18), which is borne at one end in shackle joints (20, 20′), is arranged at the press tool carrier (8) and at the round guide (21) and that a tensioning equipment (15) able to resiliently track the movement of the press tool carrier (8) engages at the round guide (21) at the other end and stands in firm connection with the crossbeam (17) of the housing posts (6).
3. Upsetting press according to claim 1 or 2, characterised thereby, that the tensioning equipment (15) for the middle linkage (13) is a piston-cylinder unit (32) with pressure storage device, which unit is loadable in double-acting manner by an hydraulic pressure medium and the piston rod (31) of which unit is enclosed by a shackle joint (29), which is disposed at the round guide (21) and provided with a ball pan, and the cylinder (33) of which unit is supported at the crossbeam (17) by means of a bearing element (34) and a support plate (35).
4. Upsetting press according to claim 1, 2 or 3, characterised thereby, that the round guide (21) is guided in a slide bushing (28), which is preferably suppliable with a lubricant, in the crankcase (9).
5. Upsetting press according to at least one of the clains 1 to 4, characterised thereby, tht the piston-cylinder unit (32), which is associated with the middle linkage (13), displays a control equipment for the exerted tension forces, which is constrainedly dependent on the drive of the crank drive (10).
6. Upsetting press according to claim 1 to 5, characterised thereby, that each outer linkage (14, 14′) is spaced equally far from the middle linkage (13) and that the outer linkage (14, 14′) is at the same time the piston rod (36, 36′) of a piston-cylinder unit (37, 37′), which unit is loadable in double-acting manner by an hydraulic pressure medium, wherein the piston rod (36, 36′) is enclosed by a shackle joint (41, 41′), which is arranged at the crankcase (9) and provided with a ball pan, and wherein the cylinder (38, 38′) is supported at the crossbeam (17) by means of a bearing element (34′, 34˝) and a support plate (35).
7. Upsetting press according to claim 1 to 6, characterised thereby, that the piston-cylinder unit (37, 37′) associated with each outer linkage (14, 14′) displays an actively actuable control equipment for the balancing-out of the mechanical setting of the crankcase (9).
8. Upsetting press according to claim 1 to 7, characterised thereby, that the shackle joint (29, 41, 41′) respectively of the middle linkage (13) and the outer linkages (14, 14′) is arranged in a mounting (23, 42, 42′), which is detachable from the crankcase (9), preferably by means of spigots (43, 43′) and bolts (44, 44′).
9. Upsetting press according to claim 1 to 8, characterised thereby, that the crankcase (9), the crank drive (10) and the press tool carrier (8) are displaceable as one constructional unit into the assembly or disassembly position (X) by means of the piston-cylinder unit (37, 37′) of each outer linkage (14, 14′).

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