Mill housing

Abstract

The present application relates to a rolling mill housing (1) for rolling metal workpieces, the rolling mill housing comprising a first rolling mill stand (3) arranged on the drive side and a second rolling mill stand (5) arranged on the operating side, wherein each of the rolling mill stands (3, 5) has at least one receiving opening (6, 7) for a fitting (8, 9), the fitting being for rotatably supporting a roll neck provided on a non-axially movable roll (10); at least two locking plates (11, 12, 13, 14), the locking plates being for locking the fitting (8, 9), wherein each of the locking plates (11, 12, 13, 14) is respectively arranged on the end face of the corresponding rolling mill stand (3, 5) remote from the roll and is at least form-fittingly connected to the rolling mill stand by at least one axial force measuring bolt (15, 16, 17, 18), such that each of the locking plates (11, 12, 13, 14) overlaps at least a part of the corresponding receiving opening (8, 9), such that an axial force caused during the rolling process and transmitted via the roll neck, the fitting (8, 9) and the locking plate (11, 12, 13, 14) to at least one of the axial force measuring bolts (15, 16, 17, 18) can be detected by the corresponding axial force measuring bolt (15, 16, 17, 18).

Description

Technical Field

[0001] The present invention relates to a rolling mill stand for rolling metal workpieces during a hot rolling process or a cold rolling process. Background Art

[0002] Rolling mill stands for rolling metal workpieces are basically known from the prior art. In a rolling mill stand that does not include axially movable rolls, each working roll is rotatably and axially non-play supported in a fitting, also referred to as a bearing housing, by two roll necks. Thus, ideally, only forces extending transversely to the longitudinal axis of the working roll should occur during the rolling process.

[0003] However, the ideal situation is hardly achievable in practice because the working rolls are subjected to a variety of interferences from the rolling process. For example, asymmetries within the workpiece to be rolled will cause significant interferences during the rolling process. These interferences cause compensating axial movements or compensating axial forces of the rolls. By supporting the working rolls axially without play, this will have an adverse effect on the rolling quality of the workpiece to be rolled and on the bearings built into the fittings.

[0004] From CN 102327902 A, an operating-side rolling mill housing with a working roll rotatably supported in a fitting is known. The fitting arranged in the operating-side rolling mill housing is locked against axial movement by a locking plate. The locking plate is screwed to the operating-side rolling mill housing by a pre-tensioned screw. The lengthened screw has a strain gauge, by which the axial force extending only in the direction of the operating-side rolling mill housing of the working roll can be measured.

[0005] Furthermore, from CN 205413924 U, another device for measuring the axial force in the operating-side rolling mill housing is known. The device includes a bolt with a strain gauge, which is arranged in the operating-side rolling mill housing and tightened against the operating-side rolling mill housing in a pre-tensioned manner.

[0006] Against this background, the object of the present invention is to provide a rolling mill stand with which an improved product quality can be achieved for the rolled workpiece and which has low maintenance requirements. Summary of the Invention

[0007] According to the invention, this object is solved by the rolling mill stand.

[0008] The rolling mill housing according to the invention is arranged for rolling metal rolling stock, and the rolling mill housing includes a first rolling mill stand arranged on the drive side and a second rolling mill stand arranged on the operating side. Each of the rolling mill stands has at least one receiving opening for a fitting, and the fitting is for rotatably supporting a non-axially movable roll provided with a roll neck. In addition, the rolling mill housing includes at least two locking plates for locking the fitting and the roll supported in the fitting against axial movement towards the outside of the rolling mill stand. At least one locking plate is respectively arranged on the end face of the corresponding rolling mill stand remote from the roll. In addition, the rolling mill stand includes at least two axial force measuring bolts. Each of the at least two locking plates is in a moved position during the rolling operation, in which position the locking plate covers at least a part of the corresponding receiving opening to lock the fitting located in the receiving opening and the roll rotatably supported in the fitting against axial movement. In this moved position, the locking plates are respectively at least form-fittingly connected to the rolling mill stand by at least one axial force measuring bolt, so that the axial force caused during the rolling process and transmitted via the roll neck, the fitting and the locking plate to at least one of the axial force measuring bolts can be detected by the corresponding axial force measuring bolt.

[0009] The important recognition on which the present invention is based is that by detecting the axial force of the work roll in not just one but two axial directions, namely in the directions of the operating side and the drive side of the rolling mill housing, the process-related and / or unit-related disturbance variables occurring in the process can be better identified and thus quantitatively adjusted. This will particularly advantageously affect the product quality of the rolled rolling stock and the wear, which results in a reduced maintenance requirement for the rolling mill housing.

[0010] According to the present invention, this is achieved by constructing the two rolling mill stands substantially identically, so that the axial force caused during the rolling process can be transmitted to and thus detected by at least one of the axial force measuring bolts via the roll neck, the fitting and the locking plate, regardless of the axial direction in which the axial force acts.

[0011] The adjustment of the detected process-related and / or unit-related disturbance variables can be carried out manually by a worker, for example. However, it is advantageous that this is an automatic adjustment. For this purpose, the rolling mill housing preferably has an adjustment loop including RAC-programming (Roll Alignment Control) and / or TFC-programming (Thrust Force Control), and this programming acts on the hydraulic adjustment link of the rolling mill housing correspondingly depending on the value obtained from the axial force measuring bolts.

[0012] In a first preferred embodiment, each of at least two locking plates is in form-fitting connection with the rolling mill housing by means of at least one axial force measuring bolt such that each of the axial force measuring bolts is not pre-tensioned. It has been shown here that this non-pre-tensioning of the axial force measuring bolts results in a particularly high measuring resolution since the entire force introduced can be measured. In this case, it has proven to be particularly advantageous that each of the axial force measuring bolts is in form-fitting and material connection with the rolling mill housing. Typically, each of the axial force measuring bolts has thread sections at its two end portions. The axial force measuring bolt is screwed in form-fitting connection with the rolling mill housing by means of the first thread section. The locking plate is fixed by means of the second thread section with the aid of a measuring nut, preferably with a clearance. In order to ensure no clearance in the two threads, the threads are adhesively bonded, for example, by means of a thread adhesive in an additional material connection.

[0013] In a further preferred embodiment, at least one locking plate arranged on the drive side is implemented as immovable and at least one locking plate arranged on the operating side is implemented as movable. The roll change can be carried out particularly easily by means of the horizontally movable locking plate. The housing fittings, which are usually fixed in the rolling mill housing against axial movement, move laterally outwards during the roll change and release the corresponding fittings for removal on the operating side of the rolling mill housing. It is particularly advantageous for this embodiment that the axial force measuring bolts are not fastened to the locking plates and the locking plates can then be moved horizontally freely since the time-consuming disassembly of the axial force measuring bolts, which is used for roll changing, can then be saved. In this case, it is particularly preferred that at least one locking plate arranged on the operating side includes an actuator by means of which the locking plate can be moved such that the roll change can be carried out semi-automatically or fully automatically.

[0014] The actuator can be configured, for example, in the form of a hydraulic cylinder or in the form of a threaded drive.

[0015] In a further preferred embodiment, the axial force measuring bolts arranged on the operating side have a larger overall diameter compared to the axial force measuring bolts arranged on the drive side. The larger size of the diameter compensates here for the unfavourable lever arm on at least one locking plate arranged on the operating side.

[0016] The concept "overall diameter" is understood in the sense of the present invention as the diameter averaged over the entire length of the axial force measuring bolt.

[0017] Particularly preferably, the rolling mill housing includes at least two, preferably four or eight locking plates such that each of the fittings can be locked by means of at least two or even four locking plates.

[0018] In order to generate a symmetrical lever on the respective locking plate, it is advantageously arranged that each of the locking plates is connected to the respective rolling mill stand in a form-fitting manner, in particular preferably in a form-fitting and material-locking manner, by means of at least two axial force measuring bolts.

[0019] Each of the axial force measuring bolts preferably has a substantially columnar-shaped base body, which has a first thread section arranged at the first distal end, a second thread section arranged at the second distal end, and an intermediate section arranged between the first thread section and the second thread section. The intermediate section has at least one radial transverse hole and at least one strain gauge. The transverse hole leads into the central longitudinal hole of the axial force measuring bolt. The strain gauge is arranged on the outer side of the intermediate section and is arranged at a distance from the transverse hole.

[0020] Through the transverse hole necessary for the electrical connection of the strain gauge, the axial force measuring bolt and in particular the intermediate section are asymmetrically loaded with the introduced axial force. Among them, a particularly high load is applied to the direct area around the transverse hole. Surprisingly, it has been shown that the arrangement of the strain gauges axially spaced apart from the transverse holes is particularly advantageous for the quality of the test results. In this case, it is particularly preferred that the strain gauges each have a minimum spacing relative to the transverse hole, and this minimum spacing is at least equivalent to 1.5 times the diameter of the transverse hole, particularly preferably at least equivalent to 2 times the diameter of the transverse hole, and quite preferably equivalent to 3 to 5 times the diameter of the transverse hole. The spacing here refers to the midpoint of the transverse hole to the midpoint of the strain gauge. Regarding the positional arrangement, at least one strain gauge can be arranged on a common generatrix with the transverse hole, on a common circumferential line and / or on different generatrices and circumferential lines. When arranging the position, it should be noted that the strain gauge is positioned on the surface of the axial force measuring bolt such that the strain gauge can acquire the axial strain occurring on the strain gauge. The resistance of the strain gauge changes due to strain or deformation, and this resistance can then be converted into an axial force.

[0021] In a particularly preferred embodiment, the intermediate section has at least one pressure relief groove extending transversely to the longitudinal axis of the axial force measuring bolt on its surface in the region of at least one transverse hole. In this case, it is advantageous that the at least one pressure relief groove has a minimum length and this minimum length is at least 2 / 10 of the diameter of the intermediate section, more preferably at least 3 / 10 of the diameter of the intermediate section, and particularly preferably at least 4 / 10 to at most 6 / 10 of the diameter of the intermediate section. By means of at least one pressure relief groove arranged in the region of the transverse hole, the load generated due to the introduced axial force will be reduced again and the quality of the test results will be improved.

[0022] Further advantageously, the axial force measuring bolt has a sleeve which is arranged on two sealing support surfaces spaced apart from one another and extending on the circumferential side, such that the at least one strain gauge arranged on the outer side between the two sealing support surfaces is hermetically enclosed.

[0023] Further advantageously, the axial force measuring bolt is made of chrome-nickel steel.

[0024] Further advantageously, the first thread section has a larger diameter than the second thread section. The axial force measuring bolt is positively, preferably positively and materially connected to the housing of the rolling mill stand via the first thread section. The axial force measuring bolt can be positively and / or materially connected, preferably positively and materially connected, to the measuring nut via the second thread section. The first thread section can be implemented correspondingly long to enable optimal force introduction. If necessary, the first thread section can be arranged in the housing of the rolling mill stand via a separate thread bush. Description of the Drawings

[0025] The present invention and the technical field are explained in more detail below with reference to the drawings. It should be noted that the present invention should not be limited by the illustrated embodiments. In particular, unless otherwise explicitly stated, partial aspects of the facts explained in the drawings can also be extracted and combined with other components and knowledge from this specification and / or the drawings. It should be specifically noted that the drawings and in particular the illustrated dimensional ratios are merely schematic. Identical reference numerals denote identical objects, so that the explanations of other drawings can be used as a supplement if necessary. Shown in the figures are:

[0026] Figure 1 Schematic horizontal cross-sectional view of an embodiment of a rolling mill stand according to the present invention,

[0027] Figure 2 In Figure 1 Illustration of an embodiment of the axial force measuring bolt shown with a sleeve and a measuring nut, and

[0028] Figure 3 Partial cross-sectional view of the axial force measuring bolt arranged in the rolling mill stand according to the above embodiment. Detailed Description of the Invention

[0029] Figure 1Shows an embodiment of a rolling mill stand 1 according to the present invention, which is designed for rolling metal workpieces. The rolling mill stand 1 includes a first rolling mill housing 3 arranged on the drive side 2 and a second rolling mill housing 5 arranged on the operating side 4. Each of the rolling mill housings 3, 5 has at least one receiving opening 6, 7 for respective fittings 8, 9. The fittings 8, 9 are used for rotatably supporting a rolling roll 10, which is provided with roll necks 8.1, 9.1 and is not axially movable.

[0030] Figure 1 The shown rolling mill stand 1 has four locking plates 11, 12, 13, 14 in the currently shown embodiment, which are used for locking the fittings 8, 9 and thus locking the rolling roll to prevent axial movement. For installing and removing the rolling roll from the rolling mill housing, the rolling roll and the fitting are moved together in the axial direction through the receiving opening of the rolling mill stand. For this purpose, the receiving opening is released by moving the locking plates 11 - 14 transversely to the axial direction. Preferably, every two of the locking plates 11, 12, 13, 14 on the end faces of the respective rolling mill housings 3, 5 remote from the rolling roll are arranged at the height position of the fittings 8, 9. In the currently shown embodiment, each of the locking plates 11, 12, 13, 14 is connected to the rolling mill stand 1 by at least one axial force measuring bolt 15, 16, 17, 18. Preferably, each locking plate can also be provided with two axially force measuring bolts arranged perpendicular to each other. However, due to the horizontal cross-section, only one axial force measuring bolt 15, 16, 17, 18 is visible on each of the locking plates 11, 12, 13, 14 in the current Figure 1 case.

[0031] In the currently shown embodiment, each of the axial force measuring bolts 15, 16, 17, 18 is in form-fitting connection with the respective rolling mill housing 3, 5 and preferably also in material connection, such that each of the locking plates 11, 12, 13, 14 covers at least a part of the receiving openings 6, 7 of the respective rolling mill housing 3, 5, so that the axial force caused during the rolling process and transmitted via the roll neck, the fittings 8, 9 and the locking plates 11, 12, 13, 14 to at least one of the axial force measuring bolts 15, 16, 17, 18 can be detected by the respective axial force measuring bolt 15, 16, 17, 18. In the currently shown embodiment, the axial force measuring bolts 17, 18 arranged on the operating side have a larger diameter than the axial force measuring bolts 15, 16 arranged on the drive side.

[0032] Preferably, the two locking plates 11 and 12 arranged on the drive side are immovably connected to the rolling mill housing, while the two locking plates 13 and 14 arranged on the operating side are implemented as movable. These embodiments work particularly advantageously when the axial force measuring bolts 13 and 14 do not have a pre-tightening force relative to the locking plates, because time-consuming disassembly of the axial force measuring bolts or the locking plates, which is used for replacing the roll 10, can be saved. Here, the two locking plates 13 and 14 arranged on the operating side have an actuator (not shown), by which the two locking plates 13 and 14 arranged on the operating side can be moved fully automatically.

[0033] To achieve particularly high measurement resolution, the eight axial force measuring bolts 15, 16, 17, 18 arranged in the rolling mill housing 1 are form-fittingly and materially connected in a non-pre-tightened manner. Here, this is achieved by providing a gap 35 ( Figure 3 ) between the measuring nuts 19 of the axial force measuring bolts 15, 16, 17, 18 and the corresponding locking plates 11, 12, 13, 14. By not pre-tightening the axial force measuring bolts 15, 16, 17, 18, particularly high measurement resolution is achieved because the total axial force introduced can be measured. Here, it is supportive that the axial force measuring bolts 15, 16, 17, 18 are fixed to the rolling mill housing 3, 5 on one side in a form-fitting manner and preferably also materially connected, while on the other side they are form-fittingly and preferably also materially connected through the measuring nuts 19. Here, the material connection is achieved by an adhesive connection.

[0034] By detecting the axial force in the two axial directions of the roll 10, i.e., on the operating side 4 and the drive side 2 of the rolling mill stand 1, several disturbance variables occurring in the process and / or related to the unit are identified, so that the disturbance variables can be adjusted quantitatively. This will particularly advantageously affect the product quality of the rolled workpiece and the wear, which results in a reduced maintenance requirement for the rolling mill stand 1.

[0035] Figure 2 An embodiment of one of the axial force measuring bolts 17 shown in Figure 1 is shown with a sleeve 20 and a measuring nut 19. The axial force measuring bolt 17 is made of, for example, chromium-nickel steel 30CrNiMo8 and is quenched and tempered for a load of 1300 N / mm 2 .

[0036] The axial force measuring bolt 17 has a substantially columnar-shaped base body 21, which has a first thread section 22 arranged at the first distal end, a second thread section 23 arranged at the second distal end, and an intermediate section 24 arranged between the first thread section 22 and the second thread section 23.

[0037] FromFigure 3 It can be partially seen that the radial force measuring bolt 17 has two transverse holes 25 and two strain gauges 27. The transverse holes are arranged radially opposite to each other and lead into the central longitudinal hole 26 of the axial force measuring bolt 17. The strain gauges are arranged radially opposite to each other on the outer side of the axial force measuring bolt and spaced apart from the transverse holes 25. In particular, from Figure 2 it can be seen that the strain gauges 27 and the transverse holes 25 are arranged on a common generatrix in the current embodiment.

[0038] In the current embodiment, the axial force measuring bolt 17 further has two pressure relief grooves 28, 29 at each of the two transverse holes 25, which extend transversely to the longitudinal axis of the axial force measuring bolt 17. By arranging the pressure relief grooves 28, 29 in the region of the transverse holes 25, the load generated due to the introduced axial force will be reduced again and the quality of the test results will be improved.

[0039] The intermediate section 24 has sealing support surfaces 30, 31 for the sleeve 20, which are raised and circumferentially extending and are arranged in the region of the first threaded section 22 and in the region of the second threaded section 23 respectively. Thus, the intermediate section 24 and the strain gauge 27 arranged on the outer side between the two sealing support surfaces 30, 31 are hermetically covered. The strain gauge 27 is effectively protected by the sleeve 20 from all environmental influences. In order to be able to optimally set the gap 35, the sleeve 20 has an axial extension smaller than the thickness of the locking plates 11, 12, 13, 14.

[0040] Figure 3 A partial cross-section of the axial force measuring bolt 17 arranged in the rolling mill stand 1 is shown in a longitudinal cross-section. Here, the electrical connection ends 32 of the corresponding strain gauges 27 can be seen, which extend through the transverse holes 25 and the central longitudinal hole 26. According to the current illustration, it can be further recognized that the first threaded section 22, which is in form-fitting and material connection with the rolling mill stand 5, has a larger diameter than the second threaded section 23. Furthermore, from Figure 3 it can be recognized that the sleeve 20 has two radially extending slots 33, 34, in which O-rings (not shown) are inserted.

[0041] Reference Signs

[0042] 1 Rolling mill stand

[0043] 2 Drive side

[0044] 3 First rolling mill housing

[0045] 4 Operating side

[0046] 5 Second rolling mill housing

[0047] 6 Receiving opening

[0048] 7 Receiving opening

[0049] 8 Assembly

[0050] 8.1 Roll neck

[0051] 9 Assembly

[0052] 9.1 Roll neck

[0053] 10 Roll

[0054] 11 Locking plate

[0055] 12 Locking plate

[0056] 13 Locking plate

[0057] 14 Locking plate

[0058] 15 Axial force measurement bolt

[0059] 16 Axial force measurement bolt

[0060] 17 Axial force measurement bolt

[0061] 18 Axial force measurement bolt

[0062] 19 Measuring nut

[0063] 20 Sleeve

[0064] 21 Columnar body

[0065] 22 First threaded section

[0066] 23 Second threaded section

[0067] 24 Intermediate section

[0068] 25 Transverse hole

[0069] 26 Longitudinal hole

[0070] 27 Strain gauge

[0071] 28 Pressure relief groove

[0072] 29 Pressure relief groove

[0073] 30 Sealing support surface

[0074] 31 Sealing support surface

[0075] 32 Electrical connection terminal

[0076] 33 Groove

[0077] 34 Groove

[0078] 35 voids

Claims

1. A rolling mill stand (1) for rolling metal workpieces, the rolling mill stand comprising: A first rolling mill housing (3) arranged on the drive side and a second rolling mill housing (5) arranged on the operating side, wherein each of the rolling mill housings (3, 5) has at least one receiving opening (6, 7) for a fitting (8, 9), the fitting being for rotatably supporting a roll neck provided with a roll neck and axially non-movable roll (10), At least two locking plates (11, 12, 13, 14) for locking the fittings (8, 9), wherein each of the locking plates (11, 12, 13, 14) is respectively arranged on the end face of the corresponding rolling mill housing (3, 5) remote from the roll, such that the locking plates (11, 12, 13, 14) cover at least a part of the receiving opening of the fitting (8, 9) and are at least form-fittingly connected to the rolling mill housing by at least one axial force measuring bolt (15, 16, 17, 18), such that the axial force caused during the rolling process and transmitted via the roll neck, the fitting (8, 9) and the locking plates (11, 12, 13, 14) to at least one of the axial force measuring bolts (15, 16, 17, 18) can be detected by the corresponding axial force measuring bolt (15, 16, 17, 18), wherein at least one of the locking plates (11, 12) arranged on the drive side is implemented as non-movable relative to the rolling mill housing on the drive side, while at least one of the locking plates (13, 14) arranged on the operating side is implemented as movable.

2. The rolling mill stand (1) according to claim 1, wherein, Each of at least two of the locking plates (11, 12, 13, 14) is at least form-fittingly connected to the rolling mill housing (3, 5) by the at least one axial force measuring bolt (15, 16, 17, 18), such that each of the axial force measuring bolts (15, 16, 17, 18) is not pre-tightened.

3. The rolling mill housing (1) according to claim 1 or 2, wherein, At least one of the locking plates (13, 14) arranged on the operating side is equipped with an actuator, and at least one of the locking plates (13, 14) can be moved by the actuator.

4. The rolling mill housing (1) according to claim 1 or 2, wherein, The axial force measuring bolts (17, 18) arranged on the operating side have a larger total diameter than the axial force measuring bolts (15, 16) arranged on the drive side.

5. The rolling mill stand (1) according to claim 1 or 2, the rolling mill stand comprising at least four locking plates (11, 12, 13, 14), such that each of the fittings (8, 9) can be locked by at least two of the locking plates (11, 12, 13, 14).

6. The rolling mill housing (1) according to claim 1 or 2, wherein, At least one of the locking plates (11, 12, 13, 14) is at least form-fittingly connected to the corresponding rolling mill housing (3, 5) by two or more axial force measuring bolts (15, 16, 17, 18).

7. The rolling mill housing (1) according to claim 1 or 2, wherein, Each of the axial force measuring bolts (15, 16, 17, 18) includes a substantially columnar-shaped base body (21), the base body having a first threaded section (22) arranged at a first distal end, a second threaded section (23) arranged at a second distal end, and an intermediate section (24) arranged between the first threaded section (22) and the second threaded section (23), wherein the intermediate section is provided with at least one radial transverse hole (25) and at least one strain gauge (27), the transverse hole opening into a central longitudinal hole (26) of the axial force measuring bolt (15, 16, 17, 18), and the strain gauge being arranged on an outer side surface of the axial force measuring bolt and spaced apart from the at least one transverse hole (25).

8. The rolling mill housing (1) according to claim 7, wherein, Each of the at least one strain gauge (27) has a minimum spacing relative to the at least one transverse hole (25), and the minimum spacing is at least 1.5 times the diameter of the transverse hole (25).

9. The rolling mill housing (1) according to claim 7, wherein, The at least one strain gauge (27) and the at least one transverse hole (25) are arranged on a common generatrix, a common circumferential line, and / or different generatrices and circumferential lines.

10. The rolling mill housing (1) according to claim 7, wherein, The intermediate section (24) has pressure relief grooves (28, 29) extending transversely to the longitudinal axis in the region of the at least one transverse hole (25).

11. The rolling mill housing (1) according to claim 10, wherein, The pressure relief grooves (28, 29) have a minimum length, and the minimum length is at least 2 / 10 of the diameter of the intermediate section.

12. The rolling mill stand (1) according to claim 7, wherein, The axial force measuring bolt (15, 16, 17, 18) has a sleeve (20), the sleeve being arranged on two sealing support surfaces (30, 31) that are spaced apart from each other and extend in the circumferential direction, so as to sealingly cover the at least one strain gauge (27) arranged on the outer side surface between the two sealing support surfaces (30, 31).

13. The rolling mill housing (1) according to claim 7, wherein, The axial force measuring bolt (15, 16, 17, 18) is made of chrome-nickel steel.

14. The rolling mill housing (1) according to claim 7, wherein, The first threaded section (22) has a larger diameter than the second threaded section (23).

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