EP0099073B1 - Device for gripping rolling discs or rings, preferably in an over-mounted arrangement - Google Patents

Abstract

1. Equipment for the tightening-up of rolling discs (2) or rolling rings (20, 20a), preferably in overhung arrangement, by means of axially directed tightening forces between planar parallel surfaces on a drive shaft (7), wherein an axially arranged extensible tie rod (5) is used to take up the tightening forces and the transmission of the tightening forces takes place by way of its clamping unit (12) to one of the end faces of the rolling disc (2) or the rolling ring (20, 20a), wherein the rolling disc (2) or the rolling ring (20, 20a) sits on a free head end (5a) of the tie rod (5) outside the drive shaft (7) and is tightenable by the exertion exclusively of axial forces with both its end faces between a pressure surface of the clamping unit (12) detachably fixed on the head end (5a) of the tie rod (5) on the one hand and an end face of the drive shaft (7) on the other hand and is in addition shape-lockingly and centringly connectable between the mutually facing end faces of the drive shaft (7) and the rolling disc (2) or the rolling ring (20, 20a), characterised thereby, that the shape-locking connection is formed of coggings (17a, 17b; 27a, 27b) at the mutually facing end faces and the rolling disc (2) or the rolling ring (20, 20a) sits directly or indirectly and with radial play (S) on the free end of the tie rod (5), wherein the tie rod (5) is by its one end (5b) detachably connected with the drive shaft (7) and engaging as deeply as desired into this for the attainment of a great extension travel and the detachably fixed clamping unit (12) extending the tie rod (5) is operated hydraulically.

Description

The invention relates to a device for bracing rolling disks or rolling rings, preferably in an overhung arrangement.

DE-A 2 639 543 and DE-A 2 549 709 have the object of such a device in which a tie rod is inserted into the drive shaft designed as a hollow shaft. By axially stretching the tie rod, axially directed compressive stresses are generated, as a result of which the roller disk is clamped axially with its two end faces between plane-parallel surfaces. The roller disc is connected to the drive shaft in a rotationally fixed manner in that a conical sleeve is inserted into the bore of the roller disc and the roller ring is braced on the drive shaft under the action of the radial forces applied. However, this leads to unavoidable or uncontrollable radial clamping forces in the cast iron rolling disks or the even more stress-sensitive hard metal, if one tries to mitigate these clamping forces through the conical sleeve upstream disc springs.

Special mention should be made of the radially directed clamping forces between the conical sleeve and the rolling ring which increase when the rolling rings or rolling disks heat up and the associated thermal expansion of the material.

Due to the axial tensioning of the roller disk or the roller ring on both sides in connection with their play-free seating on the drive shaft by means of a conical sleeve, the occurrence of clamping forces is inevitable, in particular under the action of the rolling heat. An exclusive axial bracing of the rolling disks or rolling rings with the previously known devices cannot be solved satisfactorily for the operator.

DE-U-6 808 610, from which claim 1 is based, discloses a device for bracing rolling disks in a cantilevered arrangement by means of axially directed clamping forces between plane-parallel surfaces on a drive shaft, an axially arranged stretchable tie rod being used to absorb the clamping forces , via whose clamping unit the clamping forces are transferred to one of the end faces of the roller plate, the roller plate being seated on a free head end of the tie rod outside the drive shaft and with its two end faces between a pressure surface of the clamping unit releasably fixed on the head end of the tie rod and the other one End face of the drive shaft can be clamped with the application of exclusive axial forces and, in addition, between the facing end faces of the drive shaft and the roller disk, the center face can be connected in a form-fitting manner. The known device has a centering sleeve radially provided between the drive shaft and the roller with a driver which interacts with the predetermined breaking point of the clamping bolt in the event of overload. In addition, this device is not suitable for using roller rings made of hard metal, since the clamping device cannot rule out even small radial tensions.

The object of the invention is to achieve the rotationally fixed bracing of the rolling rings with the drive shaft exclusively by applying axial compressive forces and axial positive locking and avoiding any radial clamping forces, with a reliable transmission of the torque from the drive shaft to the rolling body to be ensured. Furthermore, the roll ring change should be simplified and damage avoided. Another subtask is to be able to use a wide range of interchangeable rolling rings, especially narrow rolling rings.

To achieve the object, it is provided that the positive connection is formed from toothing on the facing end faces and the roller disc or the rolling ring is seated directly or indirectly and with radial play on the free end of the tie rod, with the tie rod at one end Reaching a large extension path in the hollow drive shaft is detachably connected to this, engaging it at any depth, and the tensioning unit, which releasably fixes the tension rod, is operated hydraulically. The positive connection is brought into engagement simultaneously with the application of the axial clamping forces by the hydraulic clamping means while centering the rolling body on the drive shaft.

A further embodiment of the invention provides that a sleeve is rotatably seated on the head end of the tie rod, on which the roller disc or a roller ring carrier and the tensioning piston of the hydraulic tensioning unit are guided with play. This advantageously serves to protect the tie rod pin by protecting it from damage when changing the roll and making the roll change easier.

The invention is advantageously further developed in that the hydraulic tensioning unit is formed from a tensioning piston surrounding the tie rod and a tensioning cylinder, the tensioning piston being gripped by means of a threaded nut on the head end of the tie rod, the tensioning cylinder on its side facing away from the roller disc or the roller ring The threaded ring is supported on the circumference of the tensioning piston and the tensioning piston is penetrated by a pressure medium channel leading to a pressure medium chamber.

In an advantageous embodiment of the invention it is provided that the tie rod is fixed to the end of the entire hollow shaft up to its end with respect to it at one end.

Advantageously, for tensioning tension-sensitive rolling rings made of hard metal, the rolling ring rests without play on a rolling ring carrier which is flange-shaped towards the drive shaft and on which the drive shaft faces away from the drive shaft Side a support disc is placed plane-parallel against the common end faces of the rolling ring and rolling ring carrier, the supporting disc is detachably connected to the rolling ring carrier and the end face of the rolling ring carrier facing the drive shaft can be positively coupled to the end face of the drive shaft facing this.

In a further embodiment of the invention, a narrow rolling ring can be clamped on both sides between supporting rings forming filler pieces between the supporting disk and the flange part of the rolling ring carrier facing the drive shaft. An outer ring part of the hydraulic clamping unit, with its end face facing the rolling ring, can lie directly against the end face of the rolling ring opposite this. This is particularly useful when using particularly narrow rolling rings made of hard metal. Narrow rolling rings are used for cost reasons if only small caliber widths are cut on the circumference of the rolling ring according to the rolling program.

The rolling ring is expediently fastened to the rolling ring carrier by means of an adhesive connection.

An advantage of the exemplary embodiments for bracing rolling disks or rolling rings is that the rolling bodies are connected to the drive shaft in a rotationally fixed manner only when pure axial forces are applied. The hydraulic clamping device is used on the one hand by lengthening or stretching the tie rod to axially brace the roller body on the one hand and on the other hand to establish a positive connection via an end toothing between the roller body and drive shaft for the safe transmission of the torque from the drive shaft to the roller body. The front toothing also serves to center the roller body with respect to the drive shaft.

• Fig. 1 die Befestigung einer Walzscheibe in fliegend gelagerter Anordnung in einem Walzgerüst im Längsschnitt im Ausschnitt,
• Fig. 2 die alternative Befestigung eines Walzringes aus Hartmetall nach Fig. 1 im Längsschnitt,
• Fig. 3 die alternative Befestigung eines schmalen Walzringes aus Hartmetall nach Fig. 1 im Längsschnitt und
• Fig. 4 eine Draufsicht auf den stirnseitigen Zahnkranz der Antriebswelle.

Embodiments of the invention are shown in the drawings. Show it:

• 1 shows the fastening of a rolling disk in a cantilevered arrangement in a roll stand in longitudinal section in a cutout,
• 2 shows the alternative fastening of a rolling ring made of hard metal according to FIG. 1 in longitudinal section,
• Fig. 3 shows the alternative attachment of a narrow rolling ring made of hard metal according to Fig. 1 in longitudinal section and
• Fig. 4 is a plan view of the front sprocket of the drive shaft.

1 denotes a part of a stand of a roll stand, in which a set of rolls consisting of two rolls is arranged in a known manner. For the rolling of wire in the intermediate and finishing lines, roller sets consisting of rolling disks 2 or rolling rings are preferably used in an overhung arrangement. The rolling disks 2 are arranged with their peripheral surfaces opposite one another on parallel drive shafts along the rolling line. Recesses 2a forming the rolling caliber K are screwed in on the peripheral surfaces.

The rolling disks 2 each have a radial play S on a sleeve 4 so that they can rotate, by the sleeve 4 being supported on the free head end 5a of a tie rod 5. The sleeve 4 serves as a wear part to protect the surface of the tie rod 5, in particular when changing the roll, but the roller disks 2 could alternatively also be seated directly on the free head end 5a of the tie rod 5 with radial play S. The tie rod 5 is screwed with its shaft 5b into the bore of a threaded drive shaft designed as a hollow shaft 7.

In order to obtain a large expansion path without the occurrence of additional stresses in the hollow shaft, the shaft 5b is designed to protrude far into the hollow shaft 7. The tie rod 5 can also penetrate the hollow shaft 7 up to its drive end and can be fixed there by means of a hammer head.

The hollow shaft 7 of each roller disc 2 is mounted in the roll stand 1 via a slide bearing 8 and an eccentric bushing 9 for radial roll adjustment. For the rotationally fixed bracing of the roller disks 2 on each hollow shaft 7 designed as a drive shaft or on the free head end 5a of the tie rod 5, a threaded nut 10, supported on the extension of the sleeve 4, supports a tensioning unit designed as a hydraulic tensioning means 12.

The hydraulic clamping means 12 consists of an annular piston 12a and an annular cylinder 12b. The ring cylinder 12b rests on the side facing away from the roller disc 2 against a threaded ring 13, which can be rotated when the pressure medium 12 is introduced to elongate the tie rod 5. In the direction of the longitudinal axis of the tie rod 5, the annular piston 12b has a pressure medium channel 12c with a coupling nipple 12d, which serves as a connection to a pressure medium supply line, not shown. The actual pressure medium chamber 12e lies between the sealing rings 14, 15. The ring cylinder 12b rests with its end face facing the roller disc 2 against the end face of the roller disc 2 facing this, while the other end side of the roller disc 2 is provided with an end-face central toothed ring 17a which has a central toothed ring 17b corresponding to the end face of the hollow shaft 7 , center the roller 2 at the same time on the sleeve 4, can be clamped by introducing pressure medium into the pressure medium chamber 12e while applying pure axial forces. Thus, the roller disc 2 is axially clamped plane-parallel, non-rotatably on the free head end 5a of the tie rod 5 or the sleeve 4, and can be coupled in a form-fitting manner with the drive shaft 7 designed as a hollow shaft via the end face central sprockets 17a, 17b which also transmits the torque to the roller disc 2 via the positive connection. The occurrence of any radial forces in the roller disc is avoided.

2 and 3, as a further exemplary embodiment, as an alternative to the roller disk 2 made of chilled cast iron according to FIG. 1, the use of a roller ring 20 or a very narrow roller ring 20a made of hard metal is shown within the scope of the roller attachment shown in principle in FIG. 1.

In FIG. 2, 21 denotes a rolling ring carrier which has a flange-like ring surface on the drive shaft side, against which the corresponding side surface of a rolling ring 20 bears. The rolling ring 20 is seated free of play or fastened by means of an adhesive connection on the outer circumference of the rolling ring carrier 21 in order to be able to absorb the rolling forces. A support disk 22 is placed against the other end face of the rolling ring 2, which is braced with threaded bolts 22a relative to the rolling ring carrier 21. The end face of the rolling ring carrier 21 facing the hollow shaft 7 is provided with an end gear ring 27a, the teeth of which form fit in a corresponding tooth ring 27b on the opposite end face of the hollow shaft 7 under the axial force of the hydraulic clamping means 12. As in FIG. 1, the rolling ring carrier 21 sits on the rolling disk 2 with radial play on the sleeve 4 or directly on the free head end 5a of the tie rod 5. The rolling ring 20 also has a caliber K cut on its circumference as a caliber roller.

Fig. 3 shows a further embodiment of the rolling ring attachment, in which a particularly narrow rolling ring 20a with smaller widths of the caliber K abuts on both sides of support rings 23 as filler pieces and otherwise between a support plate 22 detachably connected to the rolling ring carrier 21 by means of threaded bolts 22a and the drive shaft-side flange of the roller ring carrier 21 is fixed. Narrow rolling rings are used for smaller caliber widths in order to save costs. The rolling ring 20a is also seated on the rolling ring carrier 21 without play or is fastened to it by means of an adhesive connection. The rolling ring carrier 21 likewise has on its end face facing the hollow shaft 7 an end gear ring 27a which, with a corresponding end gear ring 27b on the facing end face of the hollow shaft 7, forms a couplable positive connection according to FIG. 4.

1 to the sleeve 4 seated on the free head end 5a of the tie rod 5, the threaded nut 10 is unscrewed from the free end of the tie rod 5, so that the roller disk 2 can be pushed onto the sleeve 4 as a roller body. Then the clamping means 12, consisting of clamping piston 12a, clamping cylinder 12b and threaded ring 13 is pushed onto the sleeve 4. Thereafter, the threaded nut 10 is again placed on the end of the tie rod 5 and screwed to it, so that the clamping means 12 with the roller disc 2 can rest firmly against the end face 17b of the drive shaft 7 and the sprockets 17a and 17b are positively coupled with one another. A pressure medium supply line is then connected from the outside to the coupling nipple 12d and pressure medium is supplied to the pressure medium chamber 12e via the pressure medium channel 12c. Depending on the size of the pressure of the pressure medium, the expansion path of the tie rod 5 is adjusted and the threaded ring 13 is adjusted and brought into contact with the tension cylinder 12b with its roller-side end face. The pressure medium is then drained off, so that a plane-parallel bracing of the roller disc 2, which is under the action of an axial force, and a fixed axial form-locking connection between the roller disc 2 and the drive shaft 7 are produced. The pressure medium supply line is released from the coupling nipple 12d. The roller disc 2 is seated on the sleeve 4 or on the free head part 5a of the tie rod 5 in a rotationally fixed manner. The torque of the drive shaft 7 is transmitted to the roller disc 2 via the positive connection 17a, 17b.

To remove the rolling disks 2 when changing the rolls, the tensioning means 12 and the rolling disk 2 are removed in a reverse manner, in that pressure medium is again supplied to the pressure medium chamber 12e, as described above. The threaded ring 13 is released and thus the tie rod 5 is relieved. The pressure medium is drained off again and the threaded nut 10 is loosened and removed from the head of the tie rod 5, as a result of which the clamping means 12 and the roller disc 2 can be pulled off the sleeve 4 in succession.

In the same way as described above, the rolling bodies shown in FIGS. 2 and 3, bearing roller rings 20 and 20a respectively, can be clamped on the free head end 5a of the tie rod 5 with the drive shaft 7 in a rotationally fixed and positively coupled manner under pure axial tensioning.

The tensioning means or the tensioning unit for stretching the tie rod can, in a modification of the structural and functional configuration shown in the drawings, also be designed in a known manner in such a way that the hydraulic pressure medium is applied to stretch the tie rod during rolling and only for releasing the tension, i.e. to release the roller.

The tie rod can also be provided with a tension nut in a known manner, a removable tensioning cylinder being fixed on the tie rod as a tensioning means for stretching and relieving the tension anchor and hydraulic pressure medium can be applied and the tension nut is adjusted accordingly.

Claims (9)

1. Equipment for the tightening-up of rolling discs (2) or rolling rings (20, 20a), preferably in overhung arrangement, by means of axially directed tightening forces between planar parallel surfaces on a drive shaft (7), wherein an axially arranged extensible tie rod (5) is used to take up the tightening forces and the transmission of the tightening forces takes place by way of its clamping unit (12) to one of the end faces of the rolling disc (2) or the rolling ring (20, 20a), wherein the rolling disc (2) or the rolling ring (20, 20a) sits on a free head end (5a) of the tie rod (5) outside the drive shaft (7) and is tightenable by the exertion exclusively of axial forces with both its end faces between a pressure surface of the clamping unit (12) detachably fixed on the head end (5a) of the tie rod (5) on the one hand and an end face of the drive shaft (7) on the other hand and is in addition shape-lockingly and centringly connectable between the mutually facing end faces of the drive shaft (7) and the rolling disc (2) or the rolling ring (20, 20a), characterised thereby, that the shape-locking connection is formed of coggings (17a, 17b; 27a, 27b) at the mutually facing end faces and the rolling disc (2) or the rolling ring (20, 20a) sits directly or indirectly and with radial play (S) on the free end of the tie rod (5), wherein the tie rod (5) is by its one end (5b) detachably connected with the drive shaft (7) and engaging as deeply as desired into this for the attainment of a great extension travel and the detachably fixed clamping unit (12) extending the tie rod (5) is operated hydraulically.

2. Equipement according to claim 1, characterised thereby, that a sleeve (4), on which the rolling disc (2) or a rolling ring carrier (21) as well as the clamping piston (12a) of the hydraulic clamping unit (12) are guided with play (S), sits rotatably on the head end (5a) of the tie rod (5).

3. Equipment according to claim 1 or 2, characterised thereby, that the hydraulic clamping unit (12) is formed of a clamping piston (12a) surrounding the tie rod (5) and of a clamping cylinder (12b), wherein the clamping piston (12a) is engaged behind at the head end (5a) of the tie rod (5) by means of threaded nut (10), the clamping cylinder (12b) at its side remote from the rolling disc (2) or the rolling ring (20, 20a) bears by means of threaded ring (13) on the circumference of the clamping piston (12a) and the clamping piston (12a) is penetrated by a pressure medium channel (12c) leading to a pressure medium chamber (12e).

4. Equipment according to one of the claims 1 to 3, characterised thereby, that the tie rod (5) passes through the entire hollow shaft (7) as far as its end and is fixed relative to this by its one end.

5. Equipement according to one of the claims 1 to 4, characterised thereby, that the rolling ring (20, 20a) constructed as hard metal ring sits free of play on a rolling ring carrier (21), which is constructed in flange shape towards the drive shaft (7) and at the side of which remote from the drive shaft (7) a support disc (22) lies planarly parallely against the common end faces of rolling rings (20, 20a) and rolling ring carrier (21), the support disc (22) is detachably connected with the rolling ring carrier (21) and that end face of the rolling ring carrier (21), which faces the drive shaft (7), is shape-lockingly couplable axially with that end face of the drive shaft (7), which faces it.

6. Equipement according to claim 5, characterised thereby, that between support disc (22) and that flange part of the rolling ring carrier (21), which faces the drive shaft (7), a narrow rolling ring (20a) is clampable at both sides between support rings (23) forming shims.

7. Equipment according to one of the claims 1 to 6, characterised thereby, that an outer ring part (12b) of the hydraulic clamping unit (12) lies by its end face facing the rolling ring (20, 20a) directly against that end face of the rolling ring (20, 20a), which lies opposite to this.

8. Equipment according to one of the claims 1 to 7, characterised thereby, that the rolling ring (20, 20a) is fastenable on the rolling ring carrier (21 ) by means of adhesive connection.

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