EP0484781B1 - Slab upsetting press for hot wide strip rolling mills - Google Patents

Abstract

The invention relates to an upsetting press 1 for reducing rolling stock, in particular the width of slabs in hot wide strip roughing trains with tool holders 12 which are arranged at both edges of the slab, receive press tools 13 and can be moved in the direction of slab reduction by a crank drive arranged in a crank case 7. To ensure force-free support of the upsetting press 1 on the foundation 17, each lower housing crossmember 3 of the upsetting press 1, the said members facing the press foundation 17, has, approximately in the centre, a fixed-location foundation bearing 18 and, on the longitudinal sides, at least two floating bearings 19, 20 and the crank case 7 can be locked between the lower and the upper longitudinal housing crossmembers 3, 4 with the aid of releasable clamping devices 21. <IMAGE>

Description

The invention relates to an upsetting press for the reduction of rolling stock, in particular the slab width in hot wide strip roughing mills with pressing tools accommodating pressing tools arranged on both sides to the slab edge, which can be moved in the direction of the slab reduction by a crank mechanism arranged in a crankcase, and with two lower longitudinal stanchions and two upper longitudinal stiles , wherein each lower column longitudinal spar of the upsetting press facing the press foundation has a fixed foundation bearing approximately in the center and at least two floating bearings on the longitudinal side.

In an upsetting press in accordance with the subsequently published German patent application P 39 17 398.4, pressing tools, which are received by tool carriers, are arranged on both sides of the slab edge in order to reduce the width of slabs in a hot wide strip roughing mill. 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 sequence of movements of the pressing tools for the reducing pressing and for the displacement of the pressing tools can be controlled separately from one another, so that for any feed size a synchronization of the movement of the pressing tools with the movement of the slab to be pressed laterally is guaranteed. This upsetting press enables the width of the slab to be continuously reduced to values specified by rolling technology. Upsetting presses of this size can reduce a slab with a width of approx. 2100 mm and a thickness of approx. 265 mm by up to 300 mm in just one pass. As a result of the large compression forces of up to 30 MN and under the influence of heat, the horizontal compression structure must be able to stretch without exerting forces on the foundation. Furthermore, the crankcase, from which the pressing forces are introduced into the slab, must not move in its guide play during the pressing process, so that a desired width tolerance of the reduced slab with high edge quality can also be guaranteed in continuous operation.

From the Japanese laid-open publication JP-A-63-242 403 a compression press of the type mentioned at the outset is known. The upsetting press has two horizontal press stands with upper and lower longitudinal columns, the lower of which face the press foundation. For the purpose of free expansion of the lower uprights, they have a fixed foundation approximately in the middle and two floating bearings with sliding plates are arranged in the area of the uprights on both sides of the uprights. Further details about the detailed design of fixed or floating bearings are missing. There is also no information about locking a crankcase with the press stand.

The object of the invention is to construct the compression press according to the preamble of claim 1 in such a way that the action of the pressing forces, in particular also the mass forces, and the action of heat on the compression frame and on the crankcase do not damage the press or cause any damage Reduction of the quality of the compressed slab or the edge quality leads and that a predetermined width tolerance of the compressed slab can be guaranteed. This object is achieved in the compression press mentioned at the outset with the features of claim 1. The features of the following claims 2 to 10 serve the further configuration of the upsetting press.

According to claim 1, the above-mentioned compression press is characterized in that the crankcase can be locked between the upper and lower longitudinal stanchions by means of releasable clamping devices. The pressing forces generated during the pressing process and the mass forces resulting from the moving masses are initially absorbed by the crankcase, which is firmly clamped in the scaffold stand, passed into the longitudinal struts and absorbed by them. Starting from the central fixed bearing, possible longitudinal strains of the uprights caused by the pressing forces can be intercepted by several floating bearings. In this way, thermal expansions during hot operation of the upsetting press can be absorbed in such a way that the lateral upsetting of the slabs leads to consistently good upsetting results.

To form the fixed bearing of the upsetting press, it is advantageously provided that each lower upright longitudinal spar has lateral claws approximately in the middle of the spar and is supported on a fitting plate in a bearing plate connected to the foundation with the spar leading side plates, that the lateral claws engage in the side plates and that the claws can be clamped to the bearing plate by means of connecting elements - preferably with screw connections. With the help of these construction elements, a very robust construction is achieved for the fixed bearing of the upsetting press, and a very safe and fixed anchoring of this heavy machine on the foundation in the middle of the rolling line of the other hot rolling stands is guaranteed.

In order to form the floating bearing of the upsetting press, it is proposed according to one embodiment of the invention that the side of the lower upright longitudinal strut facing the foundation in this area has a metal pressure plate, that in this area an opposite side with the foundation connected bearing plate has a metal pressure plate, and that between the metal pressure plates, a rustproof, polished metal plate and a slide plate made of plastic with cavities arranged on the sliding surface with lubricant-fillable cavities - preferably made of polytetrafluoroethylene (PTFE) - are arranged, each in one of the metal pressure plates are inserted. The construction of these loose supports meets the highest demands, in particular the PTFE sliding plate significantly reduces the resistance to sliding friction. The cavities arranged on the upper sliding surface of the PTFE sliding plate with a lubricant are particularly advantageous. As a result, the effect of the so-called micro friction between the sliding surfaces of such a support can be significantly reduced. To design such a loose support it is further proposed that the metal pressure plates are made of stainless steel, which are glued and screwed to the spar or to the bearing plate. The measures of the stand of the upsetting press are largely protected against corrosion by these measures. It is also advantageous if the screw heads embedded in the pressure plates are chambered with a sealing filling compound before the polished metal plate or the PTFE sliding plate are inserted into the pressure plates.

To form a loose support with side guides, it is additionally proposed that the floating bearing connected to the bearing plate, the side member leading side pillars, that standing bores are arranged in bores of lateral claws of the pillar longitudinal members, which stand on the bearing plate and the other end of which is a short distance above the claw has a counter plate that on the counter plate a screw connection reaching into the bearing plate or into the foundation is supported and that between the claws and the side plates sliding fitting plates are arranged against each other. These measures ensure that the uprights remain stretchable in the longitudinal direction, but still get a safe lateral guidance. As a result of the arrangement of the standing bushing, all tensioning forces go directly from the screw connection into the bearing plate. For multiple support of the scaffold stand on the foundation, a sequence of floating bearings, with or without side guiding of the longitudinal column spar, which extends from the fixed bearing on both sides, is also proposed.

For the correct fixing of the crankcase within the upsetting press, it is further proposed that the clamping devices for the crankcase are hydraulic clamping cylinders, which can be adjusted depending on the pressing forces so that the crankcase does not move back and forth in the guiding play during the pressing process. It is expedient here if the hydraulic clamping cylinders are located on each upper longitudinal side of the crankcase, opposite the underside of the upper stator longitudinal bar and are arranged between a guide rail fastened to the crankcase, spanning the lower stator longitudinal bar at a distance, and the outside of each lower stator longitudinal bar. The crankcase is laterally clamped by the two hydraulic clamping cylinders and pressed by the four hydraulic clamping cylinders on the two lower longitudinal pillars.

In the releasable clamping device for the crankcase, a sliding plate is advantageously arranged between the clamping cylinder and the respective clamping surface and it is further provided that the crankcase is on the the lower upright longitudinal spars by means of sliding plates so that the consequences of wear from the constant micro friction between the clamping cylinder and the clamping surface remain as small as possible.

Figur 1

die Seitenansicht der Stauchpresse mit dem liegenden, mehrfach auf dem Fundament abgestützten Gerüstständer,

Figur 2

die mittlere Lagerplatte des Gerüstständers mit Festlager und Loslager,

Figur 3

einen Schnitt durch das Festlager entlang der Linie III-III in Fig. 2,

Figur 4

einen Schnitt durch das Loslager mit Seitenführung entlang der Linie IV-IV in Fig. 2,

Figur 5

einen Schnitt durch das Loslager ohne Seitenführung,

Figur 6

einen Teilausschnitt des zwischen den Ständerlängsholmen eingespannten Kurbelgehäuses.

The invention is described in more detail below. Show it

Figure 1

the side view of the upsetting press with the scaffold stand lying on it, supported several times on the foundation,

Figure 2

the middle bearing plate of the scaffold stand with fixed bearing and floating bearing,

Figure 3

a section through the fixed bearing along the line III-III in Fig. 2,

Figure 4

3 shows a section through the floating bearing with lateral guidance along the line IV-IV in FIG. 2,

Figure 5

a section through the floating bearing without lateral guidance,

Figure 6

a partial section of the crankcase clamped between the longitudinal stiles.

The side view of the upsetting press 1, partially shown in section in FIG. 1, shows a horizontal scaffold stand 2 with two lower uprights 3 and two upper uprights 4 and cross members 5 which connect the uprights to one another. A crankcase 7 is arranged on both sides of a longitudinal slab 3, 4 on both sides of a slab 6 to be reduced in width, which has a mechanical adjustment (not shown) and a Balancing device 8 is supported on the crossbar 5 of the scaffold stand. Two eccentric shafts 9 with pressure connecting rods 10 are mounted in the crankcase 7. The connecting rod heads 11 are connected to a tool carrier 12 for the pressing tools 13. With the help of the pressing tools 13 and with the help of the pressing forces emanating from the crank drive, the slab 6, which is transported by driving rollers 14 through the upsetting press, is reduced in width. The pressing forces are transmitted to the eccentric shafts by a motor and transmission arrangement 15 with the aid of cardan shafts 16. The lower uprights 3 are supported on the foundation 17 several times. In the central area of the upsetting press, support is provided with the aid of a fixed bearing 18, followed on both sides of the stand by a floating bearing 19 with lateral guidance, a floating bearing 20 without lateral guidance and a floating bearing 19 with lateral guidance. To support and lock the crankcase 7 in the scaffold stand 2, releasable clamping devices 21 are arranged between the lower upright longitudinal members 3 and the upper upright longitudinal members 4. The proposed support of the upsetting press on the foundation as well as the selected locking of the crankcase in the upsetting press make it possible for the stands to expand freely under the action of pressing force and heat in the direction of the pressing forces without forces being exerted on the foundation. The construction of the fixed bearing, floating bearing and locking device required for this is described in more detail below.

Fig. 2 shows a bearing plate 22 connected to the foundation 17 for the central fixed bearing 18 and two adjacent floating bearings 19 with side guides for the two lower longitudinal pillars 3. The longitudinal section along the line III-III in Fig. 2 shows in Fig. 3 that for the purpose of forming the fixed bearing 18, each lower upright longitudinal bar has lateral claws 23 approximately in the middle of the bar, and that it is supported on a fitting plate 24 on the bearing plate 22 connected to the foundation 17 with two lateral side plates 25 leading the spar. The lateral claws 23 of the longitudinal longitudinal spar engage in the side plates 25 and the claws 23 are firmly clamped to the bearing plate 22 by means of the screw connections 26. The longitudinal section along the line IV-IV in Fig. 2 shows in Fig. 4 the formation of the floating bearing such that the side facing the foundation 17 in this area of the lower longitudinal column 3 has a metal pressure plate 27 and that the opposite in this area with the bearing plate 22 connected to the foundation 17 also contains a metal pressure plate 28. A rustproof, polished metal plate 29 and a sliding plate 30 made of plastic, preferably made of polytetrafluoroethylene (PTFE), are arranged between the metal pressure plates 27, 28. The polished metal plate and the PTFE sliding plate are each inserted in one of the metal pressure plates 27, 28. On the sliding surface 31 of the plastic sliding plate 30 opposite the polished metal plate 29 there are cavities 48 - shown only in sections - which are filled with lubricant to reduce micro-friction. The metal pressure plates 27, 28 are made of stainless steel and are glued to the lower longitudinal stile 3 or to the bearing plate 22 and, as shown in FIG. 5, screwed to the stile or to the bearing plate with screws 32. The screw head countersunk in the pressure plates 27, 28 is additionally chambered with a filling compound, so that possible corrosion at the connection points of the bearing elements is excluded as far as possible. It can be seen that Fig. 5 shows the bearing elements of a non-locating bearing without side guide for the longitudinal pillar.

Returning to FIG. 4, the floating bearing shown there with a side guide has two side plates 33 connected to the bearing plate 22, which guide the longitudinal stile 3, and also lateral claws of the longitudinal stile, in which holes 35 for so-called standing bushes 36 are arranged. These standing bushes stand on the bearing plate 22 and have a counter plate 37 at their other end at a short distance above the lateral claws 34. A screw connection 38 reaching into the bearing plate 22 or into the foundation 17 is supported on the counter plate 37. Between the side claws 34 of the longitudinal strut and the side plates 33 there are sliding plates 39, 40 which slide against one another and which are glued and / or screwed to the claw 34 and to the inside of the side plate.

6 shows, based on a partial section, the crankcase 7 as well as the lower longitudinal stile 3 and the upper longitudinal stile 4. The crankcase is locked by means of releasable clamping devices 21 between the upper and the lower longitudinal stile. These clamping devices are hydraulic clamping cylinders 41. These are located on each upper longitudinal side 42 of the crankcase 7, opposite the underside of the upper longitudinal column 4. On the lower part of the crankcase 7, a guide rail 43 which extends across the lower stator longitudinal beam 3 is arranged laterally on the outside 49. The hydraulic clamping cylinder 41 is arranged between this guide rail and the outer side 44 of the lower longitudinal column. A sliding plate 45 is arranged between the respective clamping cylinder 41 and the clamping surface interacting therewith. The crankcase 7 lies on the lower longitudinal stile 3 by means of a pair of sliding plates 46, 47 on. With the help of the sliding plates 45, 46, 47, possible wear, which can be attributed to constant micro-friction, is largely avoided.

With the measures described above, it is ensured in a surprisingly simple manner that all strains caused by the action of heat and pressing forces can be absorbed by the scaffold stand of the compression frame without excessive forces being conducted into the foundation.

Reference symbol overview

1

Upset press

2nd

Scaffolding stand

3rd

lower longitudinal column

4th

upper longitudinal pillar

5

Crossbar

6

Slab

7

Crankcase

8th

Balancing device

9

Eccentric shaft

10th

Pressure connecting rod

11

Connecting rod

12th

Tool carrier

13

Press tool

14

Driver role

15

Gear motor assembly

16

PTO shaft

17th

foundation

18th

Fixed camp

19th

Floating bearing with side guide

20th

Floating bearing without side guide

21

Jig

22

Bearing plate

23

lateral claw

24th

Fitting plate

25th

Side plate

26

Screw connection

27

metal pressure plate

28

metal pressure plate

29

polished metal plate

30th

Plastic sliding plate

31

Sliding surface

32

screw

33

Side plate

34

lateral claw

35

drilling

36

Standing rifle

37

Counter plate

38

Screw connection

39

Fitting plate

40

Fitting plate

41

hydraulic clamping cylinder

42

upper long side crankcase

43

Guide rail

44

Outside, uprights

45

Sliding plate

46, 47

Pair of sliding plates

48

cavity

49

Outside, crankcase

Claims (10)

1. Upsetting press (1) for reduction of roll stock (6), especially of the slab width in hot wide strip roughing trains with tool carriers (12), which receive pressing tools (13) arranged at both sides with respect to the slab edges and which are movable in the direction of slab reduction by a crank drive arranged in a crank housing (7), and with two lower housing girders (3) and two upper housing girders (4), wherein each lower housing girder (3), which faces the press foundation (17), of the upsetting press (1) has a foundation fixed bearing (18) approximately centrally and at least two free bearings (19, 20) at the longitudinal sides, characterised thereby that the crank housing (7) is lockable between the lower and upper housing girders (3, 4) with the aid of releasable clamping devices (21).
2. Upsetting press according to claim 1, characterised thereby that for the purpose of formation of the fixed bearing (18) each lower housing girder (3) has lateral feet (23) approximately in the girder centre and is supported on an adapter plate (24) in a base plate (22), which is connected with the foundation (17), with side plates (25) guiding the girder, that the lateral feet (23) engage in the side plates (25) and that the feet (23) are tightenable to the base plate (22) by means of connecting elements (26), preferably by screw connections.
3. Upsetting press according to claim 1 or 2, characterised thereby that for the purpose of formation of the free bearing (19, 20) the side of the lower housing girder (3) facing the foundation (17) in this region has a metallic pressure plate (27), that a base plate (22) disposed opposite in this region and connected with the foundation (17) has a metallic pressure plate (28) and that a corrosion-resistant, polished metal plate (29) and a slide plate (30) of synthetic material, preferably of polytetrafluoroethylene (PTFE), with cavities (48) arranged on the slide surface (31) and fillable with lubricant are arranged between and each respectively inserted in one of the metallic pressure plates (27, 28).
4. Upsetting press according to claim 1, 2 and 3, characterised thereby that the metallic pressure plates (27, 28) consist of stainless steel and are glued and screw-connected to, respectively the lower housing girder (3) and the base plate (22).
5. Upsetting press according to at least one of claims 1 to 4, characterised thereby that the free bearing (19) comprises side plates (33) connected with the base plate (22) and guiding the housing girder (3), that spacer sleeves (36), which stand on the base plate (22) and the other ends of which have a counter plate (37) at a small spacing above lateral feet (34) of the housing girders, are arranged in bores (35) of the feet (34), that a screw connection (38) reaching into the base plate (22) and into the foundation (17) is supported at the counter plate (17) and that adapter plates (46, 47) sliding against one another are arranged between the feet (34) and the side plates (33).
6. Upsetting press according to at least one of claims 1 to 5, characterised by a succession of free bearings (19), which go out from the fixed bearing (18) on both sides, with lateral guidance of the housing girder or by free bearings (20) without lateral guidance of the housing girder.
7. Upsetting press according to at least one of claims 1 to 6, characterised thereby that the clamping devices (21) for the crank housing (7) are hydraulic clamping cylinders (41).
8. Upsetting press according to at least one of claims 1 to 7, characterised thereby that the hydraulic clamping cylinders (41) are disposed on each upper longitudinal side (42) of the crank housing (7) to lie opposite the underside of the upper housing girder (4) as well as are arranged between the outer side (44) of each lower housing girder (3) and a guide rail (43) which is fastened to the crank housing (7) and engages over the lower housing girder (3) at a spacing.
9. Upsetting press according to at least one of claims 1 to 8, characterised thereby that a slide plate (45) is arranged between each clamping cylinder (41) and respective clamping surface.
10. Upsetting press according to at least one of claims 1 to 9, characterised thereby that the crank housing (7) bears on the lower housing girders (3) by means of slide plates (46, 47).

Images