Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
  • B21B31/16—Adjusting or positioning rolls
  • B21B31/18—Adjusting or positioning rolls by moving rolls axially

Definitions

• Multi-roll stand in particular six-high roll stand, with an axial displacement and holding device for displaceably mounted intermediate rolls and / or work rolls
• the invention relates to a multi-roll stand, in particular a six-high roll stand, with an axial displacement and holding device for displaceably mounted intermediate rolls and / or work rolls, in which the chocks are slidably guided in the roll stand in the direction of the rolling force and in which the intermediate rolls and / or work rolls together with their respective chocks can be axially displaced in opposite directions by hydraulic piston-cylinder units acting in the direction of the roller axes, and both piston rods are each articulated by means of a main traverse.
• each piston-cylinder unit On each side of a connecting crosshead there is an articulated piston or cylinder unit, which is bolted to the roll stand, for moving an intermediate or work roll.
• Each piston-cylinder unit is controlled by its own servo control circuit.
• the displacement distances of the piston-cylinder units are recorded using distance sensors. A malfunction of the displacement sensors, the hydraulic valves or a loose contact on the control cables can cause the pistons of the displacement cylinders to travel to different heights or in opposite directions in an uncontrolled manner. This can damage the connecting crossbar and make it unusable.
• the multi-roll stand referred to at the beginning with an axial displacement and holding device for the intermediate rolls is provided, for example, in the form of two axially outwardly projecting arms as pliers (DE 24 40 495 C3).
• the extendable piston rod of a piston-cylinder unit is connected to each of these arms by means of a connecting member, the two piston Cylinder units are arranged in the mill stand next to the respective chock.
• Such designs do not require a main traverse. However, they are not secured against the failure of a hydraulic or electrical malfunction.
• a similar construction (DE 35 04 415 A1) uses displaceable bearings for the roller within the chock and a sliding carriage which receives a coupling device for the pin.
• piston-cylinder units that run parallel to the roller axis attack, the malfunction of which can cause the slide to jam.
• EP 0 026 903 transmits the axial displacement force of the parallel piston-cylinder units arranged on the outside via a main traverse, via holding plates acting in parallel on both sides and a piston-cylinder unit for releasing the holding plates when the roller unit is removed should.
• the third piston-cylinder unit only takes on an alternating function. Nevertheless, no measures are provided for hydraulic or electrical malfunctions to protect the crossbar.
• an axial displacement and holding device for displaceably mounted intermediate rolls of a multi-roll mill stand is known (DE 31 45 134 C2), which generates high axial forces and which can be quickly released from the intermediate roll journal for changing the rolls.
• an axial bearing block is guided on each slide using a parallel shaft core.
• the coupling device is designed as a chuck for coupling with the intermediate roller journal. Since a traverse is also necessary for the piston-cylinder units here, there is also the risk of a carriage jamming.
• the object of the invention is to lock the intermediate rolls and / or the work rolls in the crossbeams and to shift the point of application of the displacement force in such a way that the crossbeams cannot be damaged by a hydraulic or electrical malfunction.
• the object is achieved according to the invention in that sliding beams arranged on both sides of the roll chock are each mounted in the roll stand by means of a connecting cross member, that the connecting cross members are articulated in the center of the main cross member, with the piston rods of the piston-cylinder units at the ends the main traverse are articulated and that each piston-cylinder unit can be controlled depending on the path by means of a displacement sensor.
• the main advantage results from the division into the main crossbeam and the connecting crossbeam, so that the main crossbeam cannot be braced.
• Another advantage is a safe displacement function and easy installation and maintenance can also be carried out.
• a locking block for locking the roller is arranged on the drive side between the shifting bars in the roller chock.
• roller chock can be connected to the locking block by means of a bracing element.
• the holding forces can be applied and transmitted so cheaply that the connecting cross-piece with the locking block can be fixed by means of an axially effective bracing washer arranged in the center of the connecting cross-member.
• the holding force is advantageously generated in such a way that the bracing disk can be actuated by means of a hydraulically acting bracing drive.
• This bracing drive is particularly simple and effective due to its central arrangement.
• the dimension of the displacement path is calculated as the mean of the displacement paths detected in two mutually assigned displacement sensors.
• the piston-cylinder units are then controlled in such a way that the calculated mean value of the displacement paths recorded in two displacement sensors can be entered into the independent control circuit of the piston-cylinder units.
• 1 is a plan view of a half side of a roll stand
• FIG. 2 shows a section A-A through the roll stand according to FIG. 1 at the level of the bracing drive
• Fig. 3 shows a section B-B in the amount of the bracing element in the open position
• Fig. 4 shows the same section B-B in the locked position.
• a locking block 8 for locking the rollers 11 is located in the roller chock 7 between the shifting bars 1a.
• the roller chock 7 with the locking block 8 is connected by means of a bracing element 9.
• the holding device is now designed in such a way that the connecting cross-member 2 with the locking block 8 is fixed by means of an axially and / or radially acting bracing washer 12 arranged in the center of the connecting cross-member 2.
• the bracing disk 12 can be actuated by means of a hydraulically acting bracing drive 9a.
• the dimension of the displacement path 13 is calculated as the mean value of the displacement paths 13 detected in the two mutually assigned displacement sensors 10.
• the calculated mean value of the displacement paths 13 recorded in the two displacement sensors 10 is introduced into the respectively independent control loop of the piston-cylinder units 5.
• FIG. 2 the plane of the bracing drive 9a is now shown.
• a turntable 14 of the tensioning drive 9a is rotatably supported between the two-sided displacement beams 1a and can be rotated back and forth.
• the rotary movement is e.g. generated by a hydraulically, electrically and / or mechanically operating linear thrust engine 15, so that from the linear movement 16 the rotary movement 17 into the respective one, indicated by an arrow
• the bracing disk 12 (FIG. 3), which is located axially under the bracing drive 9a, is open in the position shown, the bracing disk 12 with its longitudinal shape 12a pointing upwards.
• the locking block 8 is therefore axially free and the roller 11, for example an intermediate roller, can be pulled out axially to the operating side for the purpose of replacement.
• the bracing disc 12 with its longitudinal shape 12a is placed transversely by means of the bracing drive 9a and the locking block 8 can no longer be moved axially, ie the sliding bar 1a, the locking block 8, the connecting cross member 2 with the main cross member 4 form a rigid unit.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Control Of Metal Rolling (AREA)
• Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
• Metal Rolling (AREA)
• Crushing And Grinding (AREA)
• Actuator (AREA)
• Paper (AREA)
• Continuous Casting (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=7712718

Family Applications (1)

Country Status (9)

Families Citing this family (4)

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• 2002
  • 2002-01-18 DE DE10202217A patent/DE10202217A1/de not_active Withdrawn
  • 2002-12-05 JP JP2003559697A patent/JP4325993B2/ja not_active Expired - Fee Related
  • 2002-12-05 WO PCT/EP2002/013765 patent/WO2003059545A1/fr not_active Ceased
  • 2002-12-05 AU AU2002352219A patent/AU2002352219A1/en not_active Abandoned
  • 2002-12-05 DE DE50207039T patent/DE50207039D1/de not_active Expired - Lifetime
  • 2002-12-05 RU RU2004125175/02A patent/RU2301124C2/ru not_active IP Right Cessation
  • 2002-12-05 US US10/501,681 patent/US7032424B2/en not_active Expired - Fee Related
  • 2002-12-05 EP EP02787911A patent/EP1465742B1/fr not_active Expired - Lifetime
  • 2002-12-05 AT AT02787911T patent/ATE327841T1/de active
  • 2002-12-05 CN CNB028272927A patent/CN1292849C/zh not_active Expired - Fee Related

Non-Patent Citations (1)

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