Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
  • B21B27/02—Shape or construction of rolls
  • B21B27/03—Sleeved rolls
  • B21B27/035—Rolls for bars, rods, rounds, tubes, wire or the like
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
  • B21B13/005—Cantilevered roll stands

Definitions

• the invention relates to a rolling ring arrangement and a method for tensioning a rolling ring on a shaft in such a rolling ring arrangement.
• EP 343440 B and DE 201 08 915 U show rolling ring arrangements in which the rolling ring is essentially tensioned by axial working tension.
• a ring cone is provided for centering in the radial direction.
• This is operated by the same single hydraulic clamping device, which is also responsible for the axial clamping. Independent radial clamping or aligning and axial clamping is therefore not possible. It is also not possible to remove the hydraulic tensioning tool from the shaft after the working tension has been applied and, for example, to use it for another rolling ring arrangement.
• DE 3 834 606 A This is where the invention begins.
• a rolling ring arrangement with a rolling ring, with a shaft on which the rolling ring is arranged in a rotationally fixed manner and which has a threaded region and a fastening region which are located axially next to the rolling ring, with a nut screwed onto the threaded region and having an axial Exercises working tension on the rolling ring, which is sufficiently large for a transmission of a torque required for a rolling process between the shaft and the rolling ring, with a hydraulic axial tensioning device which is releasably attached to the fastening area and which, independently of the nut, has the high axial working tension can exert the rolling ring and a radial positioning unit which can be actuated independently of the axial clamping device and the nut, which has a centering means and which is designed such that radial play between the shaft and the rolling ring is eliminated via its centering means.
• the high axial working tension required for a tensioning process can alternatively be applied by the nut screwed onto the threaded area or by the hydraulic axial tensioning device. Both work independently of each other.
• the nut can be rotated or actuated independently of the axial clamping device, the axial clamping device works independently of the nut.
• the axial clamping device is intended to carry out the clamping process and also the release process.
• the nut is intended to maintain the working voltage achieved hydraulically. This makes it possible to remove the axial clamping device from the shaft as soon as the axial working tension is transmitted through the nut.
• the radial positioning is independent of the axial clamping.
• the rolling ring can be centered using the radial positioning unit without having to change or change the axial tension.
• the rolling ring arrangement thus enables an axial tensioning device, which is formed in a tensioning tool, to be used in succession for a large number of rolling ring arrangements during tensioning and relaxation.
• the axial tension achieved is maintained by the nut, which is a relatively simple mechanical component. There is therefore no need to provide an expensive hydraulically operating axial clamping tool for each individual rolling ring arrangement.
• the radial positioning unit works independently of the two components responsible for the axial tension, namely the nut and the hydraulic axial tensioning device, the radial positioning can be carried out in a targeted and careful manner.
• the radial force exerted on the roller rings can thus be metered very precisely and specifically. Excessive radial tension that would reduce the life of the rolling rings can be prevented. Rather, the radial tension can be kept so low that only positioning takes place without the rolling ring being noticeably tensioned radially. It is therefore deliberately spoken of a radial positioning and an axial clamping in the context of the present application.
• the invention also relates to a method for tensioning a rolling ring on a shaft of a roll stand using the rolling ring attachments. Order as described above.
• it is an object to specify a method for tensioning a rolling ring of a shaft, in which the smallest possible, in any case controllable, radial forces are exerted on the rolling ring during tensioning and, independently of this, a high axial tension necessary for the transmission of a torque during the rolling process can be applied.
• This object is achieved by a method for tensioning a rolling ring on a shaft of a roll stand, the shaft having a threaded region and a fastening region, both of which are located next to the rolling ring, a nut is provided which is screwed onto the threaded region and which has a high height can exert axial working tension on the rolling ring, which is sufficiently large for the transmission of one for one
• a hydraulically operating, axial clamping device which is detachably arranged on the fastening area and which can exert the high axial working tension on the rolling ring independently of the nut and as an alternative to the nut and a radial positioning unit is provided which a) can be actuated independently of the nut and the axial clamping device b) has a centering means located between the rolling ring and the shaft and c) is designed so that any radial play between the shaft and the rolling ring is eliminated by the centering means, in which method a clamping process of the rolling ring is eliminated on the wave is as follows:
• the radial positioning unit is operated in such a way that radial play between the shaft and the rolling ring is eliminated
• the axial clamping device is operated in such a way that the high axial working tension is applied between the shaft and the rolling ring
• the hydraulic tension can be switched off and the tensioning device can be removed after tensioning, which must be done hydraulically, and turning the nut against the rolling ring.
• the axial tension is then maintained by the nut.
• the radial positioning takes place using the radial positioning unit. The latter is only operated in such a way that the radial stresses on the rolling ring remain within the permitted limits, but adequate radial positioning or centering of the rolling ring is achieved.
• a certain radial positioning is initially carried out with the first radial positioning force. This is followed by axial tensioning with a first axial tension. The radial positioning is now carried out again, and it is increased to a second positioning force. The axial clamping device is then actuated to a second axial clamping. These processes are carried out until the required high axial working tension is reached and the radial positioning has taken place. It is also possible to start with axial clamping and only then to position it radially. The initial axial tension must be chosen so low that radial positioning remains possible.
• the radial positioning unit is released, for example relaxed, after the high axial working voltage has been reached.
• the radial positioning of the rolling ring cannot change once the high axial working tension is applied because the rolling ring is fixed by the high axial working tension.
• the radial positioning unit operate hydraulically and have an expandable hydraulic pressure chamber system that does not communicate with the hydraulic axial tensioning device.
• the radial positioning unit has its own drive, which is preferably designed hydraulically. It is fundamentally possible to design this drive in another way, for example mechanically, pneumatically or the like.
• the centering means have an annular cone.
• a rigid centering device has proven to be cheap.
• a combination of a centering cone and an axially acting hydraulic pressure chamber system has proven to be an advantageous embodiment of the radial positioning unit.
• a clamping tool is provided which accommodates at least the axial clamping device, but preferably also accommodates an axially operating hydraulic pressure chamber system of the radial positioning unit.
• the nut with holes running parallel to the axial direction and to insert a pin into each hole, which is slidably arranged in the hole and is designed for pressure transmission between the hydraulic pressure chamber system of the radial positioning unit and an annular cone .
• the bevels of the ring cone are preferably chosen so that it is self-locking. Once radial positioning has taken place, the ring cone no longer has to be actively held by the hydraulic pressure chamber system. Rather, this can be removed, which is done by removing the clamping tool in which the axial clamping device is also located.
• a radially expandable sleeve is advantageous as the centering means. As has already been pointed out, this can work hydraulically, it can also work in another way, for example by radial force acting on the cuff, expanding radially. Such a cuff can be used instead of the ring cone mentioned above.
• the fastening area has a smaller outside diameter than the inside diameter of the thread of the nut. It is then possible to only have to turn the nut over the threaded area when attaching or removing the nut, while the nut can be pushed over the fastening area. This simplifies assembly.
• the thread area can be designed as a fine winch.
• the fastening area can be designed in such a way that the clamping tool can be assembled and disassembled quickly, for example it can be designed as a bayonet connection, as a quick screw connection, etc.
• the hydraulically operating axial clamping device has a support means which the nut freely overlaps radially and also axially and has the window for turning the nut, the support means is preferably designed as a support sleeve or a plurality of support pins.
• the two axial clamping means namely the nut and the axial clamping device, are arranged axially next to one another. They both act on the same side surface of the rolling ring, albeit on different partial surfaces of the side surface of the rolling ring, or an intermediate support ring or the like.
• the support means transmits the clamping force of the axial clamping device to the rolling ring radially outside the nut.
• the support means can be of any design, for example a ring with windows, an arrangement of pins, etc.
• the nut can be turned through the windows without the support means having to be actuated.
• the nut has a nut thread adapted to the thread area and there is an axial clearance between the nut thread and the rolling ring.
• This axial free space is preferably larger than the diameter of the thread area.
• the axial clearance acts at least as part of an axial spring. It is stretched by the axial tensioning device. The axial spring pulls the nut against the rolling ring after tensioning. During the normal rolling process, there is no hydraulic tension on the rolling ring arrangement, rather the clamping tool is removed. The high axial working tension is only maintained mechanically. This means that there are only small masses in the rolling ring arrangement.
• the clamping tool can be used for other rolling ring arrangements. It is understood that the invention preferably relates to shafts with a free shaft end.
• FIG. 1 an axial sectional view of a rolling ring arrangement of a rolling stand (not shown here, since it is known per se), with an oil clamping pocket as the centering means,
• FIG. 2 a representation like FIG. 1, but now with two cone sleeves as centering means and a clamping tool, which receives an axial clamping device and a hydraulic pressure chamber system of a radial positioning unit,
• FIG. 3 an illustration like FIG. 2, but now with a mechanically expandable cylinder liner as centering means
• FIG. 4 a representation similar to FIG. 3 of a fourth exemplary embodiment, in which the centering means is now a conical sleeve and
• FIG. 5 an illustration of the fourth exemplary embodiment according to FIG. 4 in the embodiment for the normal operating state of the roller, that is to say with the high axial working tension being transmitted by a nut, the clamping tool removed and with a protective cap.
• Figure 1 shows a first embodiment of the rolling ring assembly, the individual features and functions are explained in this embodiment.
• the other three exemplary embodiments according to FIGS. 2, 3 and 4 including 5 are only explained to the extent that this appears necessary for the description of the changes or deviations with reference to the explanations for the first exemplary embodiment.
• functionally identical, in particular identical components have the same reference numerals.
• the invention preferably relates to rolling ring arrangements mounted at the ends, but is in principle also applicable to rolling ring arrangements mounted on two sides.
• the rolling ring arrangement according to the first exemplary embodiment has a rolling ring 22 made of hard metal, which has two grooves in the exemplary embodiment shown here. It is for the production of long material, e.g. B. wire designed.
• the arrangement also has a shaft 20, of which only one (left) end region is shown.
• the shaft 20 has a collar on which the rolling ring 22 is supported to the right.
• a sealing arrangement 24 is interposed, it is known per se, it need not be discussed in more detail here.
• the shaft 20 Starting from its shaft collar and towards the left, free end, the shaft 20 first saw a receiving area 26 for the rolling ring, a free area 28, a threaded area 30 and a fastening area 32.
• the rolling ring is located radially outside of the receiving area 26, which is here is essentially cylindrical.
• a centering means 34 is arranged between the receiving area 32 and the rolling ring 22, which is designed here as an oil clamping pocket. The centering means 34 can be controlled and radially expanded depending on other actuating devices which will be described later.
• the free area 28 serves as a spring together with possibly other sections of the shaft 20, which will be discussed later.
• the threaded area 30 is designed as a fine thread, with which a thread of a nut 36 engages. In the design examples, this has the shape of a pot, but this shape is not mandatory. It is crucial that the nut 36, including the threaded area 30, is designed such that it can exert a high axial working tension on the left side surface of the rolling ring 22, which is sufficiently large to transmit a torque between the shaft 20 and the rolling ring 22 required for a rolling process It is possible to provide an intermediate ring, support ring or the like on the side surface 38 so that the right end surface of the nut 36 does not lie directly against the rolling ring 22.
• the mother 36 finally has puncture openings 40 on its outer jacket. They are distributed so that the nut 36 can be turned easily.
• a turning tool e.g. B. polygon, toothing or a mechanical turning device for the nut 36, for example by means of a driven toothed belt, are possible.
• the fastening area 32 is provided for a clamping tool 42 which has a holding area 44 which interacts with the fastening area 32.
• the threaded region 30 and the fastening region 32 in principle, it is basically possible to design the threaded region 30 and the fastening region 32 consistently in one embodiment, for example as a thread. However, it is preferred to specifically adapt the threaded area 30 to the requirements of the nut 36, in particular as a fine thread, and to design the fastening area such that the clamping tool 42 can be quickly pushed onto the fastening area 32 or otherwise attached to it. Suitable for this are supply area 32 and holding area 44, for example, on plug threads, bayonet connections, coarse threads and the like.
• the outside diameter of the fastening area 32 is smaller than the inside diameter of the nut 36.
• a support means 46 is located radially outside the nut 36 and has essentially the shape of an annular sleeve.
• the support means 46 has windows 48 which are located in the region of the insertion openings 40.
• the support means 46 is arranged between the clamping tool 42 and the rolling ring 22. It rests on a different partial surface of the side surface 38 on the rolling ring 22 than the right end surface of the nut 36. An axial tension is applied to the rolling ring 22 via the support means 46.
• a hydraulic, axial clamping device is provided in the clamping tool. It has a hydraulic working space 52.
• the holding area 44 is provided on a stationary part 54.
• a cylinder 56 can be moved hydraulically in the axial direction 58.
• the support means 46 abuts the right end surface of the cylinder 56. If the working space 52 is filled with hydraulic fluid, the cylinder 56 presses the support means 46 against the rolling ring 22, so that the latter is axially tensioned.
• the roller ring 22 can be axially tensioned either by the nut 36 and / or by the axial tensioning device 50.
• the axial clamping device 50 of the clamping tool 42 is only used for clamping and releasing.
• the tensioned state is maintained by the nut 36, as shown in FIG. 5.
• a radial positioning unit 60 is provided, a part of which, namely the centering means 34, has already been mentioned.
• the radial positioning unit 60 consists of a centering means and an actuating means, which actively carries out the controlled radial expansion or movement of the centering means.
• This actuating means also called the drive, is designed hydraulically in the exemplary embodiment according to FIG.
• An oil hole is made in the shaft 20, which consists of an axial hole and a radial hole that meets it.
• the radial bore opens into an expandable hydraulic pressure chamber system 64 of the radial positioning unit 60, this pressure chamber system 64 is provided in the centering means 34 in the embodiment according to FIG.
• This has an external annular disk which, when the pressure chamber system 64 is filled with hydraulic fluid, expands outwards and can therefore radially exert a force on the roller ring 22. This force is preferably used only for radial centering or positioning, but not for radial clamping.
• a clamping process proceeds as follows: First, the parts are assembled as shown in Figure 1.
• the rolling ring 22 is neither radially centered nor axially tensioned.
• a certain positioning is carried out by means of the radial positioning unit 60, namely the centering means 34 is hydraulically acted upon by a first positioning force. This eliminates, or at least reduces, play between the whale ring 20 and shaft 20 in the radial direction.
• the axial clamping device 50 of the clamping tool 42 is actuated, the piston 56 is pushed axially to the right. Thereby axial clamping follows with a first axial clamping. This is still below the high axial working voltage required later.
• Repositioning is now carried out with a second positioning force in order to eliminate play which has occurred in the meantime, in particular play which has occurred due to the axial tensioning, in particular radial play.
• the axial tensioning device 50 is then actuated again, now with a second axial tension which is higher than the first axial tension.
• the free area 28 belongs to this partial area. It contains the high axial working tension.
• the nut 36 which had initially been loosely turned on the side surface 38 of the rolling ring 22 at the start of the clamping process, has now moved away from this side surface 38 by the dimension A.
• the length of the free shaft end was L before the clamping process, after the clamping process it is L + ⁇ L.
• the nut 36 is now rotated again so far against the rolling ring 22 that it bears against it. This gave her the opportunity to take over the axial tension.
• the axial tensioning device 50 can now be relaxed, ie the piston can be retracted. This can be done, for example, by positive emptying, for example suction, of the hydraulic fluid from the working space 52. Now it is the mother 36 who exerts the high axial working tension on the rolling ring 22.
• the clamping tool 42 and the support means 46 can be removed.
• the pressure in the pressure chamber system 64 is maintained because a check valve is provided in the oil bore 62. It can be released by a pin.
• a protective cap 66 is placed on the free shaft end, as shown in FIG. 5. 5, however, refers to another centering means, which should be clearly stated here.
• the protective cap lies with a seal on the side surface 38 of the rolling ring 22. It seals the entire end region beyond the rolling ring 22.
• a suitable locking device for example a lock nut.
• the clamping process is now complete. 5 can now be used for practical rolling operations. If the rolling ring 22 is worn, or if you want to dismantle it for other reasons, the clamping tool 42 is reattached. An axial tension is exerted on the rolling ring 22 by means of the axial tensioning device 50 and transmitted by the support means 46, which is so large that it is possible to freely turn the nut 36. In addition, the radial positioning unit 60 is also relaxed, if this has not already been done. The clamping tool 42 can now be removed. The mother can also be removed. The rolling ring 22 can be removed. The above-described sequence of the tensioning process or the subsequent relaxation is only an example, albeit a preferred method.
• the centering means 34 is a ring cone, to which a further inner ring cone 68 is assigned in the opposite direction.
• the actuating means of the radial positioning unit 60 is now provided in the clamping tool 42.
• the pressure chamber system 64 is provided in the stationary part 64, and an annular piston 70 belongs to it.
• the nut 36 has a number of axially parallel bores 72, which are designed, for example, as passages and are preferably arranged uniformly on a cylinder.
• a pin 74 is accommodated in each passage 72 and is freely displaceable in the axial direction.
• the preferably identical pins 74 are used to transmit an axial positioning force from the annular piston 70 to the left side surface of the centering means 34 designed as an annular cone.
• This left side surface lies in a radial plane and therefore has no steps or the like.
• the angles of the two ring cone parts 34, 68 are in the area of self-locking. This makes it possible not to maintain a radial position once reached during normal rolling operation. to have to hold. It is entirely conceivable and advantageous to fix the centering means 34 in the position reached, for example mechanically. This can be done, for example, using specially designed pins 74, for example the passages 72 are designed as threaded bores and the pins 74 are exchanged for set screws. Other mechanical fixations are possible.
• the exemplary embodiment according to FIG. 2 has the advantage that both the axial clamping device 50 and the actuating means of the radial positioning unit 60 are formed in a clamping tool 42. Furthermore, there are only solids between the rolling ring 22 and shaft 20.
• the embodiment according to FIG. 3 differs from the embodiment according to FIG. 2 in that the centering means is now a radially expandable sleeve which can be expanded radially by means of axially introduced forces.
• Pins 74 are again provided, as can also be found in the exemplary embodiment according to FIG. 2.
• the support means 46 now has a spy window 76 or more thereof. These windows are cutouts on the right side surface of the support means 46, so that there is no longer any continuous contact here. Through the at least one spy window 76, it is possible to recognize that the nut 36 is actually in contact with the rolling ring 22.

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• Physics & Mathematics (AREA)
• Geometry (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
• Clamps And Clips (AREA)

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• 2003
  • 2003-03-19 AU AU2003221606A patent/AU2003221606A1/en not_active Abandoned
  • 2003-03-19 DE DE50307518T patent/DE50307518D1/de not_active Expired - Lifetime
  • 2003-03-19 EP EP03717156A patent/EP1501643B1/fr not_active Expired - Lifetime
  • 2003-03-19 WO PCT/DE2003/000898 patent/WO2003090947A1/fr active IP Right Grant
  • 2003-03-19 AT AT03717156T patent/ATE365084T1/de not_active IP Right Cessation

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