MXPA06005573A - Adjusting roll in rolling frames, among others vertical upset forging frames - Google Patents

Abstract

The invention relates to an adjusting roll for the rapid adjustment of rolls in rolling frames, among others vertical upset forging frames, comprising at least one respective piston, which acts on both sides of a working roll to adjust the latter, by means of assembled parts of at least one working roll or an interposed support roll. The inventive adjusting roll has been improved by the provision of a piston (KO), which is equipped with two piston rods (ST1, ST2) that point in opposite directions and the piston or pistons (KO) are inserted into a respective cavity in the roll base (ZB) or roll cover (ZD), said base and cover comprising coaxial bores for conducting the piston rods (ST1, ST2).

Description

ADJUSTMENT CYLINDERS IN LAMINATION BOXES, AMONG OTHERS IN VERTICAL CUTTER BOXES FIELD OF THE INVENTION The invention relates to adjustment cylinders for long and rapid movement movements in roll stands, among others those in vertical chamfer boxes, comprising at least one plunger in each case, which through bearing slots of at least one working cylinder or an interposed cylinder acts on both sides on a working cylinder for adjustment.

BACKGROUND OF THE INVENTION The adjustment device in the vertical casing boxes has, as in the horizontal boxes, the objective of adjusting, maintaining and, if necessary, regulating the necessary gap between the cylinders. In the vertical chamfering boxes the adjustment devices are known as a purely mechanical adjustment, as purely hydraulic or as a combination of mechanical and hydraulic adjustment. The provision of one or two adjustments per side is technically possible and useful. For example, a purely hydraulic adjustment device is known in the vertical chamfer boxes in the overflow chamber of a hot strip train. This is done as a classic differential cylinder, composed of piston, cylinder cover and cylinder bottom. However, this embodiment has limits both in the required oil demand and thus in the speed of displacement and in the sensitivity to the transverse force in the case of a fully output piston rod. Up to now, the known problem has presented a purely hydraulic adjustment in the vertical overheating boxes for installations for thick plate as it is difficult to control, given. It is important to travel a very long race at a very high speed. Because after the rotation of a sheet in a short time interval must move from a gap between the minimum cylinders to the interstice between the maximum cylinders. Document US 36 24 958 describes a positioning control device for vertical deck boxes for adjusting the width of the rolling stock by means of an adjustment device for an electric threaded spindle, combined with cylinder adjusting devices regulated with hydraulic servo valves for adjusting in front of the rolling load. The cylinders are arranged laterally in the vertical carrier support cross members and are connected to the threaded spindle adjustment travel nuts by means of a coupling plate. DE-OS 32 12 525 A1 discloses a mechanism for adjusting and regulating the gap between the electrohydraulic cylinders, in particular for the cylinders of a vertical box, composed of an adjusting cylinder, whose adjusting piston can be displaced in a cylinder bore. under the action of pressure changes in a pressure medium, and by a plunger plunger, which is immersed in the pressure medium and whose movements controlled by a hydraulic stroke device cause displacements of the displacement piston, the mechanism of control being controlled. hydraulic stroke by a servo valve, as well as with a scanning device for recording the rolling forces through pressure measurement, a measuring device to determine the actual position of the plunger and a comparator that processes the position theoretical-real plunger to obtain a modification signal. The adjusting spindle is designed as a hollow body with an axial passage bore with different diameter sections, the passage bore of the adjusting spindle accommodating the hydraulic piston-cylinder units for adjusting the width and / or the thickness.

US-PS 4,658,622 A discloses a edge laminator with a pair of vertical cylinders arranged in an opposite manner. Each cylinder is equipped with a drive, which comprises two drive sections in generally parallel orientations. The first drive section is coupled with a drive wheel through a notched tooth formation, in particular for a relatively greater clearance of the gap between the rolls, when the box is not under load. The second drive section is connected to the first drive section, and more specifically also by means of a notched connection, which allows minor adjustments of the gap between the cylinders, when the rolling stand operates under load. EP 0 493 430 Bl discloses a edge rolling mill with a pair of movable housings, arranged vertically, as well as with means for moving each moving housing in a horizontal direction towards the other housing, and moving away from this and with a pair of cylinders , whose longitudinal axes are arranged in a vertical direction. The cylinders are kept rotating in the corresponding cartridges. The cartridges are supported by the corresponding mobile casings in such a way that they move with them and are inside the casing. In addition, means are provided for the displacement of each cartridge in a vertical direction with respect to its associated mobile casing. Document EP 0 491 785 Bl describes a vertical rolling mill with two vertical mobile housings, two cylinders arranged vertically with their longitudinal axes and rotatably fixed in the corresponding cartridges, the cartridges being supported by mobile housings and arranged inside the housings . A device is provided for moving each moving housing and the cartridge associated thereto in a horizontal direction towards the other housing or moving away from it and a device for moving each cartridge relative to its housing in a horizontal direction towards the other cartridge and get away from this one. Each housing has a drive mechanism, whose output side is related to the drive with the lower end of the cylinder in the corresponding cartridge and whose input side is related to the drive with a horizontal drive shaft. Each drive mechanism has a universal joint, which allows a drive that is transmitted from the shaft to the cylinder, even when the cartridge is displaced horizontally to a certain extent in relation to its casing.

DE-OS 2 047 240 describes a method for rolling in a vertical box, in which the gap between the rolls is automatically controlled during rolling. First, a flat edge profile is laminated along its lateral edges in a vertical box and then in a horizontal box in width. The interstice between the cylinders of the vertical box is automatically modified during the rolling of the ends of the profile of flat edges in such a way that their measurements during the subsequent flat lamination do not differ fundamentally from those of the remaining flat edge profile. EP 0 868 946 A2 discloses a chaser box arranged after a continuous casting installation and prior to a finishing train. This is controlled in such a way that the pre-band can be safely inserted into the first box of the finishing train, and a structural transformation in the area of the edges of the band must be ensured in order to avoid fissures in the area of the edges of the band. band. For this purpose, it is proposed to superimpose the pressure regulation circuits for the regulation of the position for the relay box for the monitoring of the degree of overcurrent as well as a limitation of the overload and a monitoring of the differential load.

EP 0 450 294 Bl discloses an adjustment mechanism for adjusting the separation between the cylinders in rolling stands, especially in rolling stands for hot or cold rolling, with at least two hydraulic adjusting cylinders , which work through bearing rings and, if necessary, support cylinders interposed on both sides on a working cylinder that must be adjusted in each case. The adjustment cylinders each have a hat-shaped piston in a cylinder housing guided on a cylinder journal and on a cylinder flange, the central piston surface of which is formed by the inner bottom of the cap and whose annular piston surface formed by the edge of the hat can be requested with a pressure medium independently of each other or individually or together.

SUMMARY OF THE INVENTION Starting from the state of the art mentioned above, the invention comprises the objective of allowing an improvement of the known purely hydraulic adjustment devices, the number of adjustment cylinders not being fixed, so that the arrangement of only one cylinder also has to be fixed. on each side it must remain technically possible.

The solution of the stated objective is possible with the invention with adjustment cylinders of the structural type mentioned in the preamble of claim 1 because the adjustment cylinder is equipped with a second piston rod in such a way that each adjustment cylinder has a piston, qμe is equipped with two piston rods oriented in opposite directions, and the piston is inserted in each case in a recess in the bottom of the cylinder or the cylinder cover, these holes having a coaxial arrangement for the passage of the piston rods . The embodiment according to the invention of the adjusting cylinder is arranged on a uniform support length along the entire stroke of the cylinder, considerably reducing the cross-sectional area of the second piston rod the required oil demand and thus executing a speed of greater displacement with the same pumping power. In this way, the application of the invention is also not limited to a vertical chamfer box in installations for thick plates, but can also be advantageously used in other boxes of other installations. An additional advantage • of this invention allows the optimization of the oil demand and the speed of displacement: The invention is further configured in the dependent claims. The proposed encapsulation of the second piston rod is configured as an additional cylinder oil chamber. Through a corresponding control, a short circuit can be generated during the free movement movement of rolling forces in the direction of the rolling material between the oil chamber being emptied and the additional oil chamber of the cylinder being filled. In this way the pumping overpower is reduced. During the rolling, a short circuit can be generated between the two oil chambers on the side of the additional rods. In this way it is possible to apply the necessary rolling force to the entire surface of the plunger.

BRIEF DESCRIPTION OF THE FIGURES The invention is described by means of partially schematic figures: They show: Figure 1, the schematic adjustment cylinder with piston, piston rod, sealing gaskets and the like; Fig. 2, the schematic control of the adjustment cylinder for a fast forward, recanteado and a fast turn; 3 shows the adjustment cylinders in a mounting situation, for example, in a relay box; Figure 4, an adjustment cylinder with two pressure chambers; Figure 5, an adjustment cylinder with three pressure chambers; Figure 6, a plunger cylinder with a pressure chamber; Figure 7, a plunger cylinder with three pressure chambers.

DETAILED DESCRIPTION OF THE INVENTION According to figure 1, the adjustment cylinder is composed of the piston (KO) with the rod (ST1) and the rod (ST2). The piston is supported on the cover (ZD) of the cylinder and the bottom (ZB) of the cylinder, both perforations being arranged coaxially for the passage of the piston rods. In the two perforations mentioned above there are housings for piston-driving elements, which in the present document are made as metal bushes (BU1), (BU2). Both metallic bushes (BU1), (BU2) are supported by corresponding covers (DE1), (DE2). The sealing seals (DI1-DI3) belonging to the cylinder are located on the cover (DE1), on the piston (KO) and on the bottom (ZB) of the cylinder. The bottom (ZB) of the cylinder and the cover (ZD) of the cylinder are screwed with the screws (SR2). The entire adjustment cylinder is screwed with the screws (SR1) into the stand of the rolling stand. In the extension of the rod (ST1) is a piece (DS) of 'pressure. The rod (ST1) is protected with a folding bellows (FB). The folding bellows (FB) is either supported by sliding discs on the rod (ST1) or is supported by loops on conductive rods not shown in this document. The cylinder piston has a protection against rotation, which is either carried out as a joint of structures not shown in the present document between the pressure pieces (DS) of two adjustment cylinders arranged one above the other or consists of extensions of the pressure piece (DS), which are driven in the aforementioned conductive rods. Following the bottom (ZB) of the cylinder is a capsule (KA), which on the one hand protects the rod (ST2) and on the other hand has the possibility of being used as an additional oil chamber (OL3). In the extension of the capsule (KA) there is a displacement measurement system, in this document realized as position sensor (PG), which records the position of the piston of the cylinder. The embodiment of the adjustment cylinder in FIG. 4 and FIG. 5 is in accordance with the direction. In the embodiment as a plunger cylinder, figure 6 and 7, the cylinder cover and the bottom of the cylinder are a part (PB) and the piston (KO) is already only composed of the rods (ST3, ST4) of the cylinder. adjustment. The oil chambers (OL, 0L2, 0L3) shown in FIG. 5 form, according to the embodiment, annular surfaces A1 and A2 or circular surface A3 relevant to the force. In FIG. 2, the control for rapid advancement and retraction of the adjusting cylinder with a reduced flow rate or re-rolling of the rolling material with a high force is explained schematically. Each of the steps 1 to 3 of operation, ie fast forward, overcurrent with high force and fast turn, can be well recognized by FIG. 2. Step 1 fast forward with a reduced force: pressure on the surface A2; the surfaces Al and A3 are as free as possible (p2 »0; P? * 0) optimally: A1« A3; the ducts 1 and 3 can be connected, then the oil flows from the duct 1 towards the duct 3 or exchange, more in accordance with the direction, of the surfaces A2 and A3 Stage 2 overlapping with a high pressure force on the surface A2 and the surface A3; the surface Al < the surfaces A2 + A3 Stage 3 fast turn pressure on the surface Al; surfaces A2 and A3 are free of pressure or requested with little pressure.

Figure 3 shows the assembly situation of four different assembly forms of adjustment cylinders in a recater box. All forms of assembly have in common the realization with two piston rods.

In the use of the adjusting cylinder in a recater box, it is mounted four times in a manner corresponding to FIG. 3; two adjustment cylinders on each side, which are arranged above and below the middle plane (9) of the supports. However, the provision of only one adjustment cylinder per side is also technically possible. The cylinders are inserted in the corresponding perforations of the bracket (8) of the recanteador and act on the cylinders (7) Reheaters. Attached to a balancing cross member (6), the balancing cylinder (5) tightens the set of the entire system. The roll cylinder (5) can also take the function of a rollback cylinder.

In figures 4 to 7 the following cylinder embodiments are shown: Figure 4 shows an adjustment cylinder with 2 pressure chambers and the active surfaces Al and A2, figure 5 shows an adjustment cylinder with 3 pressure chambers and active surfaces Al, A2 and A3, figure 6 shows a plunger cylinder with 1 pressure chamber and active surface A2, figure 7 shows a plunger cylinder with 2 pressure chambers and surfaces A2 and A3 active The operation of each one of the assemblies can be selected according to the necessary specifications, for example according to figure 4: double acting cylinder with pressure applied to the annular surface A2 for rapid advancement and to apply the rolling force, the surface When pressing the cylinder for reversing the cylinder, FIG. 5 is a double-action cylinder with pressure applied to the annular surface A2 and / or the circumferential surface A3 for rapid advancement and use of the annular surface A2 and / o of the surface A3 circular to apply the rolling force, the surface To the ring is requested at pressure for the return of the cylinder Figure 6: cylinder plunger diver with pressure under pressure of the annular surface A2 for fast forward and for apply the rolling force, the rocker cylinder (5) acts as a return cylinder Figure 7: plunger cylinder diver with request Pressurization of the annular surface A2 and / or of the circular surface A3 for the rapid advance and use of the annular surface A2 and / or of the circular surface A3 for applying the rolling force, the cylinder (5) of the rocker acts as a return cylinder or the single-action cylinder figure 5 with pressure applied to the annular surface A2 and / or of the circular surface A3 for rapid advancement and use of the annular surface A2 and / or of the circular surface A3 for application the rolling force, the annular surface is free of pressure, the rocker cylinder (5) acts as the recoil cylinder, or the single action cylinder figure 4 with pressure application of the annular surface A2 for fast forwarding and for generating the rolling force, the surface When the ring is free of pressure, the rocker cylinder (5) acts as a return cylinder. Differential circuits of the Al and / or A2 and / or A3 pressure chambers can also be considered, for example, to generate the necessary quantities of oil. The pressurized pressure of each of the pressure chambers is carried out by means of magnetic valves, servo valves, check valves, pumps, containers, pressure containers, tanks, etc. corresponding to the state of the art.

Claims (14)

NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and, therefore, the content of the following is claimed as property: CLAIMS

1. Adjusting cylinder for long and fast running movements in roll stands, among others, in vertical chamfering boxes, comprising at least one plunger in each case, which through bearing slots of at least one working cylinder or a interposed cylinder acts on both sides of a working cylinder for adjustment, each adjustment cylinder having a piston (KO) which is equipped with two piston rods (STl, ST2) oriented in opposite directions, and the piston being inserted (KO) ) in each case in a recess in the bottom (ZB) of the cylinder or the cover (ZD) of the cylinder and having these perforations arranged coaxially for the passage of the plunger rods (STl, ST2), characterized in that the surface ( Al) formed by the plunger (KO) and the plunger rod (STl) is configured smaller than the surface (A2) formed by the plunger (KO) and the piston rod (ST2).

2. Adjustment cylinder according to claim 1, characterized in that in the above-mentioned perforations there are provided housings for conductive elements of the piston rods which are preferably made as metal bushes (BU1, BU2) or as conductive bands and preferably are supported by covers (DE1) , DE2). Adjustment cylinder according to one of claims 1 or 2, characterized in that they are sealed together (DI1, DI2, DI3) belonging to the cylinder in the cover (DE1) and (DE2) as well as in the piston (KO) ( 1) or conductive bands with sealing seals in the covers (DE1) and (DE2) are accommodated. Adjustment cylinder according to one or more of claims 1 to 3, characterized in that the bottom (ZB) of the cylinder is connected to the cover (ZD) of the. cylinder with screws (SR2). Adjustment cylinder according to one or more of Claims 1 to 4, characterized in that the complete adjustment cylinder is connected to the housing support by means of screws (SR1). Adjustment cylinder according to one or more of Claims 1 to 5, characterized in that a capsule (KA) which either protects the plunger rod (ST2) is located below the bottom (ZB) of the cylinder, or used as a chamber (0L3) of additional oil. Adjustment cylinder according to one or several of claims 1 to 6, characterized in that in the extension of the capsule (KA) there is a displacement measuring system or the like configured as a position sensor (PG) which registers the position of the Plunger (KO). Adjustment cylinder according to one or more of claims 1 to 7, characterized in that a pressure part (DS) is arranged on the piston rod extension (STl) so as to act on the cylinder bearing rings. 9. Adjustment cylinder according to one or more of claims 1 to 8, characterized in that the piston (KO) has a protection against rotation. The adjustment cylinder according to one or more of claims 1 to 9, characterized in that the piston rod (STl) connected to the pressure piece (DS) is surrounded by a folding bellows. 11. Procedure for the operation of the adjustment cylinder, comprising a piston (KO) which can be displaced by force-dragging in a housing (Gl, G2) of at least two parts between surfaces (Al, A2, A3) of pressure, which acts on a bearing block (ES) of a rolling stand, characterized in that for the rapid advancement of the plunger (KO) with a reduced force pressure is applied on the surface A2, while, on the other hand, the surfaces Al and A3 are not requested. 12. Procedure for the operation of the adjustment cylinder, comprising a piston (KO) that can be displaced by force-dragging in a housing (Gl, G2) of at least two parts between surfaces (Al, A2, A3) of pressure, acting on a bearing block (ES) of a rolling stand, characterized in that pressure is applied to the surfaces A2 and / or A3 for the overlapping with a high force. 1

3. Procedure for the operation of the adjustment cylinder, comprising a piston (KO) which can be moved by force-dragging into a housing (Gl, G2) of at least two pieces between surfaces (Al, A2, A3) acting on a bearing block (ES) of a rolling stand, characterized in that for the rapid return of the piston (KO) pressure is applied to the surface Al and the surfaces A2 or A3 and A3 or A2 not They requested. 1

4. Procedure for the operation of the adjustment cylinder, comprising a piston (KO) that can be displaced by force-dragging in a housing (Gl, G2) of at least two parts between surfaces (Al, A2, A3) of pressure acting on a bearing block (ES) of a rolling stand according to claim 13, characterized in that a separate return cylinder is used for the rapid return of the piston (KO), with the surfaces A2 and A3 as much as possible. free of possible pressure, being the size of the surface Al also zero (piston cylinder diver).