EP3405302B1 - Strand guiding roller for guiding a metal strand in a continuous casting facility - Google Patents
Strand guiding roller for guiding a metal strand in a continuous casting facility Download PDFInfo
- Publication number
- EP3405302B1 EP3405302B1 EP17700969.3A EP17700969A EP3405302B1 EP 3405302 B1 EP3405302 B1 EP 3405302B1 EP 17700969 A EP17700969 A EP 17700969A EP 3405302 B1 EP3405302 B1 EP 3405302B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- axle
- coolant
- cooling
- bearing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000009749 continuous casting Methods 0.000 title claims description 13
- 239000002184 metal Substances 0.000 title 1
- 238000001816 cooling Methods 0.000 claims description 89
- 239000002826 coolant Substances 0.000 claims description 32
- 238000005096 rolling process Methods 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 6
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 5
- 229920002530 polyetherether ketone Polymers 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims 1
- 239000012809 cooling fluid Substances 0.000 description 67
- 238000007789 sealing Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 239000004519 grease Substances 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000001427 coherent effect Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000000110 cooling liquid Substances 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- -1 X46Cr13 Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
- B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use
Definitions
- the invention relates to a strand guide roller for guiding a metallic strand in a continuous casting installation and a method for cooling a strand guide roller.
- a metallic strand formed in a mold is guided in a strand guide, supported and further cooled.
- the partially solidified or fully solidified strand is usually supported and guided by so-called strand guide rollers.
- the strand can be cooled by cooled strand guide rollers.
- a strand guide roll For example, several roll shells of a strand guide roll are arranged on a common rotating axle, which is supported at its ends and between the roll shells with roller bearings, the roll shells being peripherally cooled, i. H. whereby the roller shells are cooled directly with a cooling liquid (usually water).
- the strand guide rollers are each designed as peripherally cooled solid rollers, at the ends of which shaft sockets are supported with roller bearings.
- the bearings of the strand guide rollers are usually located in bearing blocks that are cooled by a water circuit. Care must be taken in the design to ensure that no water gets into the bearings. This is mostly achieved by a barrier lubrication, for which additional grease is used, i. H. Grease that is not required for the actual function of the roller bearing. This grease escapes, mixes with the cooling water and has to be separated from the water again with a great deal of technical effort.
- the roll shells are usually fitted with another Cooled water circuit, the cooling water is introduced by means of a separate rotary inlet, which is a complex and sensitive component for the function of the strand guide roller.
- a strand guide roller for guiding a metallic strand in a continuous casting plant comprising a fixed axle, several roller shells, each of which coaxially surrounds an axial section of the axle, for each roller shell at least one cooling channel running along the inner surface of the roller shell for receiving a cooling fluid for cooling the roller shell , and for each roller shell at least one needle bearing arranged between the axle section and the roller shell for rotatably supporting the roller shell about the axis, the needle bearing adjoining a cooling channel and having a bearing interior that is permeable to the cooling fluid and open to the cooling channel, so that the needle bearing is operational is flowed through by the cooling fluid, the needle bearing having an outer ring which rests against a roller jacket and runs around the axis, an inner ring which rests against the axis and runs around the axis, and a plurality of rolling elements which are arranged between the outer ring and the inner ring.
- a strand guide roller with a lubricant-free bearing is known.
- the bearing features resilient inner and outer races to prevent seizing due to thermal deformation of the roller shell.
- the invention is based on the object of specifying a strand guide roller for guiding a metallic strand in a continuous casting plant, which also functions reliably in lubricant-free operation.
- a method for operating the strand guide roller according to the invention is to be specified.
- a strand guide roll according to the invention for guiding a metallic strand in a continuous casting plant comprises a fixed axle, at least one roll shell coaxially surrounding an axial section of the axle, and for each roll shell at least one cooling channel running along an inner surface of the roll shell for receiving a cooling fluid and for cooling the roll shell.
- the strand guide roller for each roller shell has at least one roller bearing arranged between the axle section surrounded by the roller shell and the roller shell for supporting the roller shell rotatably about the axis.
- the roller bearing is adjacent to a cooling channel and has a bearing interior that is permeable to cooling fluid and open to the cooling channel, so that cooling fluid can flow through the roller bearing during operation.
- the rolling bearing which is made of corrosion-resistant steel and designed for lubrication-free operation, has an outer ring that rests against a roller shell and runs around the axis, an inner ring that rests against the axis and runs around the axis, and a plurality of rolling elements arranged between the outer ring and the inner ring. At least one element from the group of the outer ring, the inner ring and the rolling bodies, at least one rolling bearing is designed to be elastically deformable in at least one direction orthogonal to a longitudinal axis of the axis, and at least one cooling channel runs helically around the axis along an inner surface of a roller shell.
- the strand guide rollers according to the invention are therefore designed as "shell rolls” whose roll shells are mounted so as to be rotatable about a fixed axis.
- Such strand guide rollers have a much simpler design and are therefore cheaper and easier to maintain than strand guide rollers with roller shells that are fixedly mounted on a rotatable axis. Since the strand guide rollers have fixed axes, bearing block cooling can also be omitted.
- Peripheral cooling of the strand guide roller is achieved in a simple manner by the cooling channel, without the peripheral cooling having to overcome problems that usually occur when using conventional roller bearings and/or rotating axes. Since the strand-guiding roller has a fixed axis, no complex and repair-prone rotary inlet for introducing cooling liquid is required. Since the roller bearings are designed to be permeable to the cooling fluid, they do not need to be protected against the ingress of cooling fluid, such as cooling water, as is the case with conventional roller bearings. In particular, this bearing of the roller shells eliminates the need to laboriously separate grease that mixes with cooling water and is used to protect roller bearings from the ingress of cooling water. The peripheral cooling also allows the strand guide roller to be used for dry casting, that is to say for continuous casting without cooling the strand by spraying it with cooling liquid.
- the invention provides that the rolling bearing is suitable for operation in a lubricant-free (i.e. without grease or oil lubrication) environment.
- a lubricant-free design of the roller bearings means that a grease or oil lubrication system can be omitted, which reduces the environmental impact and further improves the ease of maintenance of the strand guide roller.
- the roller bearing according to the invention is made of a corrosion-resistant steel, such as a martensitic, corrosion-resistant stainless steel (e.g. X46Cr13, material no. 1.4034; X90CrMoV18, material no. 1.4112; or X105CrMoV18, material -No. 1.4125), or an austenitic, corrosion-resistant stainless steel.
- a corrosion-resistant steel such as a martensitic, corrosion-resistant stainless steel (e.g. X46Cr13, material no. 1.4034; X90CrMoV18, material no. 1.4112; or X105CrMoV18, material -No. 1.4125), or an austenitic, corrosion-resistant stainless steel.
- each roller bearing has an outer ring that rests against a roller jacket and runs around the axis, an inner ring that rests against the axis and runs around the axis, and a plurality of rolling elements arranged between the outer ring and the inner ring.
- the roller bearing is designed as a so-called spring roller bearing, the outer ring and/or the inner ring and/or the roller bodies of the roller bearing being elastically deformable in at least one direction orthogonal to a longitudinal axis of the axis.
- the rolling bearing has a certain elasticity in a direction transverse to the axial direction, so that the rolling bearing is prevented from jamming even in lubricant-free operation.
- a grease filling can be introduced into the gaps between the spring strips, so that the roller bearing also functions reliably during the demanding commissioning phase.
- this design is less sensitive to dirt during operation, since dirt can accumulate in the gaps between the spring strips, thus preventing jamming.
- This embodiment of the invention provides for the bearing of the roller shell particularly suitable roller bearings through which the cooling fluid can flow.
- roller bearings with elastically deformable outer rings, inner rings and/or rolling bodies, these roller bearings can be arranged in a particularly flexible and suitable manner between the stationary axle and a roller shell of a strand guide roller.
- changes in distance caused, for example, by temperature fluctuations or elastic deformations caused by loading between the stationary axle and the roller shell can be compensated for.
- Rolling bearings with circular-cylindrical rolling elements which have a cylinder axis parallel to a longitudinal axis of the axis, advantageously allow the roller shell to be supported more stably and with less stress on the roller bearing at certain points due to the greater longitudinal extent of the rolling elements compared to, for example, spherical rolling elements.
- cooling channel is sealed off on an end face of the strand guide roller by a seal holder with a seal between the roller shell and the seal holder.
- the roller shell advantageously has an annular cavity connected to the cooling channel in the radial direction outside the seal. This reliably cools the particularly temperature-sensitive dynamic seal and extends its service life.
- At least one cooling channel running along an inner surface of a roller shell is provided.
- at least one cooling channel can be formed as a bore in the roller shell.
- at least one cooling channel runs helically around the axis along an inner surface of a roller shell.
- the helical cooling channel achieves uniform cooling of the entire surface of a roller shell. Furthermore, a flow rate of the cooling fluid can be adjusted in such a way that the heat dissipation from the surface of the roller shell is as optimal as possible. Furthermore, by suitably dimensioning the cooling channel, the flow rate can be set in such a way that the formation of deposits on the walls from the cooling fluid is prevented or reduced. Cooling channels running in a straight line or in a ring around the axis have the advantage to be geometrically simpler in design and therefore easier to implement.
- a further embodiment of the invention provides at least one tubular cooling fluid guide sleeve arranged between the axle and a roller shell, which sleeve has at least one channel-like cooling channel recess facing the roller shell for forming a cooling channel.
- This embodiment of the invention advantageously makes it possible to form cooling channels for cooling the roller shells by means of suitably designed cooling fluid guide sleeves.
- a thrust washer is arranged in the axial direction on the seal holder and the roller bearing or between the roller bearing and the cooling fluid conducting sleeve in order to compensate for relative axial movements.
- the wear of the thrust washer is particularly low when the thrust washer is made of polyetheretherketone (PEEK).
- a further embodiment of the invention provides that the axle has at least one cooling cavity that can be filled with cooling fluid, which is connected to at least one bearing interior of a roller bearing and to at least one cooling channel, so that the cooling cavity, the bearing interior and the cooling channel form a coherent receiving space for cooling fluid .
- a further development of this embodiment of the invention provides that all of the cooling channels, bearing interiors of the roller bearings and cooling cavities are connected to one another to form a coherent receiving space for the cooling fluid.
- These configurations of the invention advantageously combine internal cooling of the strand guide roller by cooling cavities in the axis that can be filled with the cooling fluid, with peripheral cooling by cooling channels connected to such cooling cavities for direct cooling of roll shells.
- a further embodiment of the invention provides that each roller shell is rotatably mounted relative to the axis by two roller bearings.
- a further embodiment of the invention provides that several roller shells are arranged one behind the other along the axis.
- a strand guide roller with a plurality of roller shells arranged one behind the other enables intermediate support of the axis in areas between two adjacent roller shells and thus a reduction in deformations due to the loading of the roller shells during operation in a continuous casting plant.
- a continuous casting plant according to the invention has a plurality of strand guide rollers according to the invention arranged one behind the other with the above-mentioned advantages.
- the object according to the invention is also achieved by the method for cooling a strand guide roller with a cooling fluid according to claim 9.
- the cooling fluid is introduced from a coolant supply into an axially arranged axis cavity of the stationary axis of the strand guide roller. Because the axis is stationary, this can be done without a complicated and high-maintenance rotary union.
- the cooling fluid is then diverted into at least one essentially radially arranged radial opening of the strand guide roller. This frees the cooling fluid from the typically centrally located axle cavity Z -space directed towards the roll shell.
- the cooling fluid is then introduced into an annular cavity, thereby cooling the seal across the web between the annular cavity and the seal.
- the rolling bearing is traversed, preferably in the axial direction. This cools the bearing and removes any abrasion from the bearing.
- the cooling fluid is then introduced into a coolant channel arranged between the roller shell and the stationary axle and flows through the cooling channel in a helical manner around the axis along an inner surface of a roller shell, as a result of which the roller shell is cooled.
- cooling medium is supplied to the annular cavity through a plurality of, preferably at least four, radial openings. This ensures a uniform velocity profile when flowing through the roller bearing.
- the cooling medium flows through the coolant channel in the axial and in the tangential direction along a coolant-guiding sleeve.
- this achieves a high flow rate, which in turn has a positive effect on the heat dissipation from the hot roller shell.
- an even temperature distribution of the roller shell in the axial and tangential direction is achieved.
- the coolant channel After the coolant channel has flowed through, it advantageously flows through a second roller bearing and the cooling fluid is introduced into a second annular cavity, then the cooling fluid is diverted into at least one further radial opening, diverted from the radial direction into an axial direction and introduced into the axial axis cavity.
- the axial cavity of the inlet and outlet lines of the cooling fluid is separated by a plug.
- the cooling fluid is drained from the axle cavity.
- the derivation can either be on the same page as the introduction or on the opposite side of the introduction.
- figure 1 shows a detail of a side view of a first exemplary embodiment of a strand guide roller 1, the strand guide roller 1 being shown broken away in order to make the interior of the strand guide roller 1 visible, and the interior being shown in section.
- the path of the cooling fluid is represented by arrows in the figures.
- the strand guide roller 1 comprises a fixed axle 3, a roller shell 5, roller bearings 7, a cooling fluid guide sleeve 11, seal brackets 13, thrust washers 15, support blocks 17, sealing rings 19, a seal 20 and a dirt seal 21, at least one stopper 24 and cooling fluid supply lines 26.
- FIG 1 are each a section of the strand guide roller 1 and the cooling fluid guide sleeve 11 in the area of one first end of the strand guide roller 1 shown. In this section there is only one rolling bearing 7, one seal holder 13, one thrust washer 15, one support block 17, one plug 24 and one cooling fluid supply 26.
- a second end of the strand guide roller 1 opposite the first end is like that in FIG figure 1 shown first end and in particular also includes a roller bearing 7, a seal holder 13, a thrust washer 15, a support block 17, a cooling fluid supply 26 and optionally a further plug 24.
- the axle 3, the roller shell 5 and a support block 17 are in figure 1 shown broken.
- the axle 3 is designed as a tubular hollow body with an annular cross-section, which surrounds an axially extending circular-cylindrical axle cavity 28 .
- At least one plug 24 dividing the axle cavity 28 is disposed in the axle cavity 28 and defines a cooling cavity 30 in the axle cavity 28 intermediate it and a cooling fluid supply 26, into and out of which a cooling fluid flows through an orifice (not shown) in the Cooling fluid supply 26 can be conducted.
- the plug 24 is insertable into the axle cavity 28 through a plug rod 25 connected thereto.
- the roller shell 5 is tubular with a circular cross-section and surrounds an axis section of the axis 3 coaxially. Between the roller shell 5 and the axis 3, the seal brackets 13, the cooling fluid conducting sleeve 11 and the roller bearing 7 are arranged.
- Each seal holder 13 is arranged between an end region of the roller shell 5 and the axle 3 , surrounds the axle 3 in a ring and is firmly connected to the axle 3 .
- Each seal holder 13 has a plurality of annular recesses on the axis side, in each of which a first sealing ring 19 is arranged, which bears against the axis 3 and surrounds it in an annular manner.
- each seal retainer 13 On the roller shell side, each seal retainer 13 has two further annular recesses, in which a dirt seal 21 and a seal 20 are arranged, which rests against the roller shell 5 and relative to which the roller shell 5 is movable.
- the dirt seal 21 on the roll shell side which is arranged closer to the end of the roll shell 5, serves to seal against dirt from the area surrounding the strand guide roller 1, and the seal 20 serves to seal against the escape of cooling fluid from the strand guide roller 1.
- each seal holder 13 has a holder opening 32 which connects a radial opening 34 in the axis 3 with a cooling fluid chamber 31 between the seal holder 13 and the roller bearing 7 .
- the radial opening 34 is connected to a cooling cavity 30 of the axle 3 so that cooling fluid can flow between the cooling cavity 30 and the cooling fluid chamber 31 through the radial opening 34 and the mounting opening 32 .
- the cooling fluid guide sleeve 11 is arranged axially between the roller bearings 7, is tubular and surrounds the axis 3 coaxially.
- the cooling fluid guide sleeve 11 has a channel-like cooling channel recess 38 which faces the roller shell 5 and runs helically around the axis 3 .
- the cooling channel recess 38 forms a coherent cooling channel 40 which runs in a helical manner along the inner surface of the roller shell 5 .
- the roller shell 5 is rotatably mounted about the axis 3 by the roller bearing 7 .
- Each roller bearing 7 has an outer ring 7.1 resting on the roller shell 5 and running around the axis 3, an inner ring 7.2 resting on the axis 3 and running around the axis 3, and several rolling bodies 7.3 arranged between the outer ring 7.1 and the inner ring 7.2 on.
- the outer ring 7.1 (but it would also be possible to have the inner ring 7.2 and/or the rolling elements 7.3) of the roller bearing 7 is made from a corrosion-resistant spring strip, so that the roller bearing (also called spring roller bearing) in a longitudinal axis of the axis 3 orthogonal directions formed elastically deformable.
- the roller bearings 7, ie the outer rings 7.1, inner rings 7.2 and rolling bodies 7.3 are made of corrosion-resistant steel in order to be protected against corrosion through contact with the cooling fluid.
- Each roller bearing 7 has a bearing interior 9 located between the outer ring 7.1 and the inner ring 7.2, which is permeable to the cooling fluid and is open to the cooling channel 40 and the cooling fluid chamber 31 adjoining the roller bearing 7, so that the cooling fluid can flow through the bearing interior 9 between the Cooling fluid chamber 31 and the cooling channel 40 can flow.
- the cooling cavities 30 and radial openings 34 in the axle 3, the mounting openings 32, the cooling fluid chambers 31, the bearing interiors 9 of the roller bearings 7 and the cooling channel 40 form a coherent receiving space for cooling fluid for cooling the roller shell 5.
- the cooling fluid is fed through at least one opening in a cooling fluid feed 26 introduced into this receiving space and passed through at least one opening in the other cooling fluid feed 26 out of it.
- the ring-shaped thrust washers 15 are each arranged as a buffer for absorbing axial forces between a seal holder 13 and the outer ring 7.1 of a roller bearing 7.
- a locking ring 22 for fixing the position of the roller bearing 7 is arranged on one end of the inner ring 7.2 of each roller bearing 7 that faces the adjacent seal holder 13.
- the thrust washers 15 for absorbing the axial forces can also be arranged between the roller shell 5 and the inner ring 7.2 or between the cooling fluid conducting sleeve 11 and the inner ring 7.2.
- the cooling fluid guide sleeve 11 can be connected to the roller shell 5 in a fixed manner, for example with a positive and non-positive fit by being pressed in.
- the support blocks 17 surround an end region of the axis 3 in a ring shape and serve to support the strand guide roller 1 against a supporting component (not shown). Each support block 17 bears against an end of the adjacent seal mount 13 which protrudes from the roller shell 5.
- FIG. 1 illustrated embodiment of a strand guide roller 1 can be modified in many ways.
- the cooling cavities 30 can be formed by bores in the axle 3 which do not extend along the entire axle 3 but only form the cooling cavities 30.
- the number of sealing rings 19, the seals 20 or the dirt seals 21 can be opposite figure 1 be changed.
- all or some sealing rings 19 can be omitted and/or several seals 20 with the same function can be arranged on a seal holder 13 .
- the cooling channel 40 can also be formed by a bore in the roller shell 5 instead of a cooling fluid guide sleeve 11 , and/or instead of just one cooling channel 40 , a plurality of cooling channels 40 can be formed on and/or in the roller shell 5 .
- the strand guide roller 1 can have a plurality of roller shells 5 arranged one behind the other along the axis 3, with the roller shells 5 being able to be of the same or different design (for example with regard to the formation of the cooling channels 40).
- figure 2 shows schematically a detail of a continuous casting plant 100 in a plan view. Shown are a mold 102 of the continuous casting plant 100 and several strand guide rollers 1 arranged downstream of the mold 102 and arranged one behind the other.
- this strand guide roller 1 has, for example, an annular cavity 41, which is located outside of the seal 20 in the radial direction, so that the temperature-sensitive seal 20 is sufficiently cooled even when the strand guide roller 1 is at a standstill. Since the dirt seal 21 is made of felt, for example, it is generally not necessary to cool it as well. The penetration of dirt into the annular cavity 41 or into the bearing interior 9 is additionally prevented by a shut-off plate 42 in addition to the dirt seal 21 . The fluid-tight sealing of the ring cavity 41 is performed by the seal 20, which is designed as a shaft sealing ring.
- the roller bearing 7 itself as in figure 1 designed as a spring roller bearing.
- a thrust ring 15 made of the high-performance plastic PEEK is arranged between the roller bearing 7 and the cooling fluid-conducting sleeve 11 .
- the thrust ring 15 compensates for relative movements, for example due to different thermal expansions, and axial forces in the strand guide roller 1 without jamming occurring.
- it is also particularly favorable that the cooling fluid is introduced into the annular cavity 41 through 6 radial openings 34 , resulting in a very even flow (and thus an even temperature distribution) in the roller bearing 7 . This measure also contributes to the robustness of the strand guide roller 1.
- a cooling fluid is introduced into the axis cavity 28 from a coolant supply not shown here, the cooling fluid is then diverted into six radial openings 34 and introduced into the annular cavity 41 via the mounting opening 32.
- the seal 20 in particular a sealing lip which bears against the roller shell 5 , is cooled via the web between the annular cavity 41 and the seal 20 .
- the web can either be made in one piece with the roller shell or be connected to the roller shell 5 by welding, for example. The flow then flows through the roller bearing 7 and the cooling fluid is introduced into the cooling channel 40 .
- the cooling fluid After flowing through the cooling channel 40 in a spiral shape, the cooling fluid flows through another roller bearing on the right-hand side of the strand-guiding roller and is introduced into another annular cavity. Thereafter, the cooling fluid is again introduced through further radial openings into a further axle cavity and then drained off.
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Description
Die Erfindung betrifft eine Strangführungsrolle zum Führen eines metallischen Strangs in einer Stranggießanlage und ein Verfahren zur Kühlung einer Strangführungsrolle.The invention relates to a strand guide roller for guiding a metallic strand in a continuous casting installation and a method for cooling a strand guide roller.
Beim Stranggießen wird ein in einer Kokille gebildeter metallischer Strang in einer Strangführung geführt, gestützt und weiter abgekühlt. Üblicherweise erfolgt das Stützen und Führen des teilerstarrten oder durcherstarrten Strangs durch sogenannte Strangführungsrollen. Außerdem kann der Strang durch gekühlte Strangführungsrollen abgekühlt werden.In continuous casting, a metallic strand formed in a mold is guided in a strand guide, supported and further cooled. The partially solidified or fully solidified strand is usually supported and guided by so-called strand guide rollers. In addition, the strand can be cooled by cooled strand guide rollers.
Beispielsweise sind mehrere Rollenmäntel einer Strangführungsrolle an einer gemeinsamen rotierenden Achse angeordnet, die an ihren Enden und zwischen den Rollenmänteln mit Wälzlagern gestützt ist, wobei die Rollenmäntel peripheriegekühlt werden, d. h. wobei die Rollenmäntel direkt mit einer Kühlflüssigkeit (in der Regel mit Wasser) gekühlt werden. Oder die Strangführungsrollen sind jeweils als peripheriegekühlte Vollrollen ausgebildet, an deren Enden Wellenstutzen mit Wälzlagern gestützt sind.For example, several roll shells of a strand guide roll are arranged on a common rotating axle, which is supported at its ends and between the roll shells with roller bearings, the roll shells being peripherally cooled, i. H. whereby the roller shells are cooled directly with a cooling liquid (usually water). Or the strand guide rollers are each designed as peripherally cooled solid rollers, at the ends of which shaft sockets are supported with roller bearings.
Die Lager der Strangführungsrollen befinden sich üblicherweise in Lagerböcken, die durch einen Wasserkreislauf gekühlt werden. Dabei muss konstruktiv darauf geachtet werden, dass kein Wasser in die Lager gelangt. Dies wird meist durch eine Sperrschmierung erreicht, für die zusätzliches Fett eingesetzt wird, d. h. Fett, das für die eigentliche Funktion der Wälzlager nicht benötigt wird. Dieses Fett tritt aus, vermischt sich mit dem Kühlwasser und muss mit einem hohen technischen Aufwand wieder von dem Wasser getrennt werden.The bearings of the strand guide rollers are usually located in bearing blocks that are cooled by a water circuit. Care must be taken in the design to ensure that no water gets into the bearings. This is mostly achieved by a barrier lubrication, for which additional grease is used, i. H. Grease that is not required for the actual function of the roller bearing. This grease escapes, mixes with the cooling water and has to be separated from the water again with a great deal of technical effort.
Bei Strangführungsrollen mit peripheriegekühlten Rollenmänteln werden die Rollenmäntel in der Regel mit einem weiteren Wasserkreislauf gekühlt, wobei das Kühlwasser mittels einer separaten Dreheinführung eingebracht wird, die eine aufwändige und sensible Komponente für die Funktion der Strangführungsrolle ist.In the case of strand guide rolls with peripherally cooled roll shells, the roll shells are usually fitted with another Cooled water circuit, the cooling water is introduced by means of a separate rotary inlet, which is a complex and sensitive component for the function of the strand guide roller.
Aus der
Weiters ist aus der
Der Erfindung liegt die Aufgabe zugrunde, eine Strangführungsrolle zum Führen eines metallischen Strangs in einer Stranggießanlage anzugeben, welche auch im schmierstofffreien Betrieb zuverlässig funktioniert. Außerdem soll ein Verfahren zum Betrieb der erfindungsgemäßen Strangführungsrolle angegeben werden.The invention is based on the object of specifying a strand guide roller for guiding a metallic strand in a continuous casting plant, which also functions reliably in lubricant-free operation. In addition, a method for operating the strand guide roller according to the invention is to be specified.
Die Aufgabe wird erfindungsgemäß hinsichtlich der Strangführungsrolle durch die Merkmale des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.The object is achieved according to the invention with regard to the strand guide roller by the features of claim 1. Advantageous configurations of the invention are the subject matter of the dependent claims.
Eine erfindungsgemäße Strangführungsrolle zum Führen eines metallischen Strangs in einer Stranggießanlage umfasst eine feststehende Achse, wenigstens einen einen Achsenabschnitt der Achse koaxial umgebenden Rollenmantel, und für jeden Rollenmantel wenigstens einen entlang einer Innenfläche des Rollenmantels verlaufenden Kühlkanal zur Aufnahme eines Kühlfluids und zur Kühlung des Rollenmantels. Ferner weist die Strangführungsrolle für jeden Rollenmantel wenigstens ein zwischen dem von dem Rollenmantel umgebenen Achsenabschnitt und dem Rollenmantel angeordnetes Wälzlager zur um die Achse drehbaren Lagerung des Rollenmantels auf. Dabei grenzt das Wälzlager an einen Kühlkanal an und weist einen für Kühlfluid durchlässigen und zu dem Kühlkanal offenen Lagerinnenraum auf, sodass das Wälzlager im Betrieb vom Kühlfluid durchströmt werden kann. Das aus einem korrosionsbeständigen Stahl gefertigte und für einen schmierstofffreien Betrieb ausgeführte Wälzlager weist einen an einem Rollenmantel anliegenden und um die Achse verlaufenden Außenring, einen an der Achse anliegenden und um die Achse verlaufenden Innenring und mehrere zwischen dem Außenring und dem Innenring angeordnete Wälzkörper auf. Zumindest ein Element aus der Gruppe des Außenrings, des Innenrings und der Wälzkörper, wenigstens eines Wälzlagers sind in wenigstens einer zu einer Längsachse der Achse orthogonalen Richtung elastisch deformierbar ausgebildet und wenigstens ein Kühlkanal verläuft helixartig um die Achse entlang einer Innenoberfläche eines Rollenmantels.A strand guide roll according to the invention for guiding a metallic strand in a continuous casting plant comprises a fixed axle, at least one roll shell coaxially surrounding an axial section of the axle, and for each roll shell at least one cooling channel running along an inner surface of the roll shell for receiving a cooling fluid and for cooling the roll shell. Furthermore, the strand guide roller for each roller shell has at least one roller bearing arranged between the axle section surrounded by the roller shell and the roller shell for supporting the roller shell rotatably about the axis. The roller bearing is adjacent to a cooling channel and has a bearing interior that is permeable to cooling fluid and open to the cooling channel, so that cooling fluid can flow through the roller bearing during operation. The rolling bearing, which is made of corrosion-resistant steel and designed for lubrication-free operation, has an outer ring that rests against a roller shell and runs around the axis, an inner ring that rests against the axis and runs around the axis, and a plurality of rolling elements arranged between the outer ring and the inner ring. At least one element from the group of the outer ring, the inner ring and the rolling bodies, at least one rolling bearing is designed to be elastically deformable in at least one direction orthogonal to a longitudinal axis of the axis, and at least one cooling channel runs helically around the axis along an inner surface of a roller shell.
Die erfindungsgemäßen Strangführungsrollen sind also als "Mantelrollen" ausgebildet, deren Rollenmäntel um eine feststehende Achse drehbar gelagert sind. Derartige Strangführungsrollen sind wesentlich einfacher gestaltet und daher kostengünstiger und wartungsfreundlicher als Strangführungsrollen mit fest an einer drehbaren Achse montierten Rollenmänteln. Da die Strangführungsrollen feststehende Achsen haben, kann außerdem eine Lagerbockkühlung entfallen.The strand guide rollers according to the invention are therefore designed as "shell rolls" whose roll shells are mounted so as to be rotatable about a fixed axis. Such strand guide rollers have a much simpler design and are therefore cheaper and easier to maintain than strand guide rollers with roller shells that are fixedly mounted on a rotatable axis. Since the strand guide rollers have fixed axes, bearing block cooling can also be omitted.
Durch den Kühlkanal wird auf einfache Weise eine Peripheriekühlung der Strangführungsrolle erreicht, ohne dass durch die Peripheriekühlung üblicherweise bei der Verwendung von herkömmlichen Wälzlagern und/oder rotierenden Achsen auftretende Probleme bewältigt werden müssen. Da die Strangführungsrolle nämlich eine feststehende Achse aufweist, wird keine aufwändige und reparaturanfällige Dreheinführung zur Einbringung von Kühlflüssigkeit benötigt. Da die Wälzlager für das Kühlfluid durchlässig ausgebildet sind, brauchen sie nicht wie herkömmliche Wälzlager gegen das Eintreten von Kühlfluid wie Kühlwasser geschützt werden. Insbesondere entfällt durch diese Lagerung der Rollenmäntel die Notwendigkeit, sich mit Kühlwasser vermischendes Fett, das zum Schutz von Wälzlagern vor dem Eindringen von Kühlwasser verwendet wird, wieder aufwändig von dem Wasser zu trennen. Die Peripheriekühlung ermöglicht ferner die Verwendung der Strangführungsrolle für einen Trockengießbetrieb, das heißt für ein Stranggießen ohne Kühlung des Strangs durch Bespritzen mit Kühlflüssigkeit.Peripheral cooling of the strand guide roller is achieved in a simple manner by the cooling channel, without the peripheral cooling having to overcome problems that usually occur when using conventional roller bearings and/or rotating axes. Since the strand-guiding roller has a fixed axis, no complex and repair-prone rotary inlet for introducing cooling liquid is required. Since the roller bearings are designed to be permeable to the cooling fluid, they do not need to be protected against the ingress of cooling fluid, such as cooling water, as is the case with conventional roller bearings. In particular, this bearing of the roller shells eliminates the need to laboriously separate grease that mixes with cooling water and is used to protect roller bearings from the ingress of cooling water. The peripheral cooling also allows the strand guide roller to be used for dry casting, that is to say for continuous casting without cooling the strand by spraying it with cooling liquid.
Die Erfindung sieht vor, dass das Wälzlager für einen Betrieb in einer schmierstofffreien (d.h. ohne eine Fett- oder Ölschmierung) Umgebung geeignet ist.The invention provides that the rolling bearing is suitable for operation in a lubricant-free (i.e. without grease or oil lubrication) environment.
Durch eine schmierstofffreie Ausführung der Wälzlager kann ein Fett- bzw. Ölschmierungssystem entfallen, wodurch die Umweltbelastung verringert und die Wartungsfreundlichkeit der Strangführungsrolle weiter verbessert wird.A lubricant-free design of the roller bearings means that a grease or oil lubrication system can be omitted, which reduces the environmental impact and further improves the ease of maintenance of the strand guide roller.
Um das Wälzlager für den schmierstofffreien Betrieb geeignet zu machen, ist das Wälzlager gemäß der Erfindung aus einem korrosionsbeständigen Stahl, wie einem martensitischen, korrosionsbeständigen Edelstahl (z.B. X46Cr13, Werkstoff-Nr. 1.4034; X90CrMoV18, Werkstoff-Nr. 1.4112; oder X105CrMoV18, Werkstoff-Nr. 1.4125), oder einem austenitischen, korrosionsbeständigen Edelstahl, gefertigt.In order to make the roller bearing suitable for lubricant-free operation, the roller bearing according to the invention is made of a corrosion-resistant steel, such as a martensitic, corrosion-resistant stainless steel (e.g. X46Cr13, material no. 1.4034; X90CrMoV18, material no. 1.4112; or X105CrMoV18, material -No. 1.4125), or an austenitic, corrosion-resistant stainless steel.
Dadurch wird das Wälzlager gegen eine durch den Kontakt des Wälzlagers mit dem Kühlfluid verursachte Korrosion geschützt.This protects the rolling bearing against corrosion caused by contact of the rolling bearing with the cooling fluid.
Außerdem weist jedes Wälzlager einen an einem Rollenmantel anliegenden und um die Achse verlaufenden Außenring, einen an der Achse anliegenden und um die Achse verlaufenden Innenring und mehrere zwischen dem Außenring und dem Innenring angeordnete Wälzkörper auf.In addition, each roller bearing has an outer ring that rests against a roller jacket and runs around the axis, an inner ring that rests against the axis and runs around the axis, and a plurality of rolling elements arranged between the outer ring and the inner ring.
Um schließlich die Zuverlässigkeit des Wälzlagers zu erhöhen, ist das Wälzlager als ein sog. Federrollenlager ausgeführt, wobei der Außenring und/oder der Innenring und/oder die Wälzkörper des Wälzlagers in wenigstens einer zu einer Längsachse der Achse orthogonalen Richtung elastisch deformierbar sind. Durch diese Ausführung weist das Wälzlager in einer Richtung quer zur axialen Richtung eine bestimmte Elastizität auf, sodass das Verklemmen des Wälzlagers auch im schmierstofffreien Betrieb verhindert wird. Außerdem kann bei der Montage der Federrollenlager in die Spalten zwischen den Federbändern eine Fettfüllung eingebracht werden, sodass das Wälzlager auch in der anspruchsvollen Inbetriebnahmephase zuverlässig funktioniert. Schließlich ist diese Ausführung im Betrieb weniger empfindlich gegen Schmutz, da sich dieser in die Spalten zwischen den Federbändern einlagern kann und so das Verklemmen verhindert wird.Finally, in order to increase the reliability of the roller bearing, the roller bearing is designed as a so-called spring roller bearing, the outer ring and/or the inner ring and/or the roller bodies of the roller bearing being elastically deformable in at least one direction orthogonal to a longitudinal axis of the axis. As a result of this design, the rolling bearing has a certain elasticity in a direction transverse to the axial direction, so that the rolling bearing is prevented from jamming even in lubricant-free operation. In addition, when assembling the spring roller bearings, a grease filling can be introduced into the gaps between the spring strips, so that the roller bearing also functions reliably during the demanding commissioning phase. Finally, this design is less sensitive to dirt during operation, since dirt can accumulate in the gaps between the spring strips, thus preventing jamming.
Diese Ausgestaltung der Erfindung sieht für die Lagerung des Rollenmantels besonders geeignete, von dem Kühlfluid durchströmbare Wälzlager vor. Durch Wälzlager mit elastisch deformierbaren Außenringen, Innenringen und/oder Wälzkörpern lassen sich diese Wälzlager insbesondere flexibel und passend zwischen der feststehenden Achse und einem Rollenmantel einer Strangführungsrolle anordnen. Dadurch können beispielsweise durch Temperaturschwankungen verursachte Abstandsänderungen oder elastische Verformungen durch Belastung zwischen der feststehenden Achse und dem Rollenmantel ausgeglichen werden.This embodiment of the invention provides for the bearing of the roller shell particularly suitable roller bearings through which the cooling fluid can flow. By means of roller bearings with elastically deformable outer rings, inner rings and/or rolling bodies, these roller bearings can be arranged in a particularly flexible and suitable manner between the stationary axle and a roller shell of a strand guide roller. As a result, changes in distance caused, for example, by temperature fluctuations or elastic deformations caused by loading between the stationary axle and the roller shell can be compensated for.
Wälzlager mit kreiszylinderförmigen Wälzkörpern, die eine zu einer Längsachse der Achse parallele Zylinderachse aufweisen, ermöglichen vorteilhaft eine aufgrund der größeren Längsausdehnung der Wälzkörper gegenüber beispielsweise kugelförmigen Wälzkörpern stabilere und das Wälzlager punktuell weniger belastende Lagerung des Rollenmantels.Rolling bearings with circular-cylindrical rolling elements, which have a cylinder axis parallel to a longitudinal axis of the axis, advantageously allow the roller shell to be supported more stably and with less stress on the roller bearing at certain points due to the greater longitudinal extent of the rolling elements compared to, for example, spherical rolling elements.
Es ist vorteilhaft, wenn der Kühlkanal auf einer Stirnseite der Strangführungsrolle durch eine Dichtungshalterung mit einer Dichtung zwischen dem Rollenmantel und der Dichtungshalterung abgedichtet wird.It is advantageous if the cooling channel is sealed off on an end face of the strand guide roller by a seal holder with a seal between the roller shell and the seal holder.
Um eine Überhitzung der Strangführungsrolle, insbesondere bei einem Stillstand derselben, signifikant zu verhindern, weist der Rollenmantel vorteilhaft in radialer Richtung außerhalb der Dichtung einen mit dem Kühlkanal verbundenen Ringhohlraum auf. Hierdurch wird die besonders temperaturempfindliche dynamische Dichtung zuverlässig gekühlt und dessen Haltbarkeit verlängert.In order to significantly prevent overheating of the strand guide roller, in particular when the same is at a standstill, the roller shell advantageously has an annular cavity connected to the cooling channel in the radial direction outside the seal. This reliably cools the particularly temperature-sensitive dynamic seal and extends its service life.
Erfindungsgemäß ist wenigstens ein entlang einer Innenoberfläche eines Rollenmantels verlaufender Kühlkanal vorgesehen. Zusätzlich dazu kann wenigstens ein Kühlkanal als eine Bohrung in dem Rollenmantel ausgebildet sein. Erfindungsgemäß verläuft wenigstens ein Kühlkanal helixartig um die Achse entlang einer Innenoberfläche eines Rollenmantels.According to the invention, at least one cooling channel running along an inner surface of a roller shell is provided. In addition to this, at least one cooling channel can be formed as a bore in the roller shell. According to the invention, at least one cooling channel runs helically around the axis along an inner surface of a roller shell.
Durch den helixartig verlaufenden Kühlkanal wird eine gleichmäßige Kühlung der gesamten Oberfläche eines Rollenmantels erreicht. Ferner kann eine Strömungsgeschwindigkeit des Kühlfluids so eingestellt werden, dass eine möglichst optimale Wärmeabfuhr aus der Oberfläche des Rollenmantels erfolgt. Des Weiteren kann durch eine geeignete Dimensionierung des Kühlkanals die Strömungsgeschwindigkeit so eingestellt werden, dass die Bildung von Ablagerungen an den Wänden aus dem Kühlfluid verhindert oder vermindert wird. Geradlinig oder ringförmig um die Achse verlaufende Kühlkanäle haben den Vorteil, geometrisch einfacher gestaltet und dadurch auch einfacher realisierbar zu sein.The helical cooling channel achieves uniform cooling of the entire surface of a roller shell. Furthermore, a flow rate of the cooling fluid can be adjusted in such a way that the heat dissipation from the surface of the roller shell is as optimal as possible. Furthermore, by suitably dimensioning the cooling channel, the flow rate can be set in such a way that the formation of deposits on the walls from the cooling fluid is prevented or reduced. Cooling channels running in a straight line or in a ring around the axis have the advantage to be geometrically simpler in design and therefore easier to implement.
Eine weitere Ausgestaltung der Erfindung sieht wenigstens eine zwischen der Achse und einem Rollenmantel angeordnete rohrartige Kühlfluidleithülse vor, die wenigstens eine dem Rollenmantel zugewandte rinnenartige Kühlkanalausnehmung zur Ausbildung eines Kühlkanals aufweist.A further embodiment of the invention provides at least one tubular cooling fluid guide sleeve arranged between the axle and a roller shell, which sleeve has at least one channel-like cooling channel recess facing the roller shell for forming a cooling channel.
Diese Ausgestaltung der Erfindung ermöglicht vorteilhaft, durch geeignet gestaltete Kühlfluidleithülsen an Rollenmänteln Kühlkanäle zu deren Kühlung zu bilden.This embodiment of the invention advantageously makes it possible to form cooling channels for cooling the roller shells by means of suitably designed cooling fluid guide sleeves.
Außerdem ist es günstig, wenn der Dichtungshalterung und dem Wälzlager oder zwischen dem Wälzlager und der Kühlfluidleithülse in axialer Richtung eine Anlaufscheibe zum Ausgleich von axialen Relativbewegungen angeordnet ist. Der Verschleiß der Anlaufscheibe ist besonders niedrig, wenn die Anlaufscheibe aus Polyetheretherketon (PEEK) hergestellt ist.In addition, it is advantageous if a thrust washer is arranged in the axial direction on the seal holder and the roller bearing or between the roller bearing and the cooling fluid conducting sleeve in order to compensate for relative axial movements. The wear of the thrust washer is particularly low when the thrust washer is made of polyetheretherketone (PEEK).
Eine weitere Ausgestaltung der Erfindung sieht vor, dass die Achse wenigstens einen mit Kühlfluid befüllbaren Kühlhohlraum aufweist, der mit wenigstens einem Lagerinnenraum eines Wälzlagers und mit wenigstens einem Kühlkanal verbunden ist, so dass der Kühlhohlraum, der Lagerinnenraum und der Kühlkanal einen zusammenhängenden Aufnahmeraum für Kühlfluid bilden. Eine Weitergestaltung dieser Ausgestaltung der Erfindung sieht vor, dass alle Kühlkanäle, Lagerinnenräume der Wälzlager und Kühlhohlräume zu einem zusammenhängenden Aufnahmeraum für das Kühlfluid miteinander verbunden sind.A further embodiment of the invention provides that the axle has at least one cooling cavity that can be filled with cooling fluid, which is connected to at least one bearing interior of a roller bearing and to at least one cooling channel, so that the cooling cavity, the bearing interior and the cooling channel form a coherent receiving space for cooling fluid . A further development of this embodiment of the invention provides that all of the cooling channels, bearing interiors of the roller bearings and cooling cavities are connected to one another to form a coherent receiving space for the cooling fluid.
Diese Ausgestaltungen der Erfindung kombinieren vorteilhaft eine Innenkühlung der Strangführungsrolle durch mit dem Kühlfluid befüllbare Kühlhohlräume in der Achse mit einer Peripheriekühlung durch mit derartigen Kühlhohlräumen verbundene Kühlkanäle zur direkten Kühlung von Rollenmänteln.These configurations of the invention advantageously combine internal cooling of the strand guide roller by cooling cavities in the axis that can be filled with the cooling fluid, with peripheral cooling by cooling channels connected to such cooling cavities for direct cooling of roll shells.
Eine weitere Ausgestaltung der Erfindung sieht vor, dass jeder Rollenmantel durch zwei Wälzlager gegenüber der Achse drehbar gelagert ist.A further embodiment of the invention provides that each roller shell is rotatably mounted relative to the axis by two roller bearings.
Dadurch wird eine stabile und gleichmäßige Lagerung der Rollenmäntel realisiert.This ensures stable and even storage of the roll shells.
Eine weitere Ausgestaltung der Erfindung sieht vor, dass entlang der Achse mehrere Rollenmäntel hintereinander angeordnet sind.A further embodiment of the invention provides that several roller shells are arranged one behind the other along the axis.
Dadurch kann die Länge der einzelnen Rollenmäntel reduziert werden, was vorteilhaft die Herstellung und den Transport der Rollenmäntel vereinfacht und die Verwendung moderat ausgelegter Wälzlager zur Lagerung der Rollenmäntel an der feststehenden Achse ermöglicht. Außerdem ermöglicht eine Strangführungsrolle mit mehreren hintereinander angeordneten Rollenmänteln eine Zwischenunterstützung der Achse in Bereichen zwischen zwei benachbarten Rollenmänteln und dadurch eine Reduzierung von Verformungen durch die Belastung der Rollenmäntel während des Betriebes in einer Stranggießanlage.As a result, the length of the individual roller shells can be reduced, which advantageously simplifies the manufacture and transport of the roller shells and allows the use of moderately designed roller bearings for mounting the roller shells on the fixed axle. In addition, a strand guide roller with a plurality of roller shells arranged one behind the other enables intermediate support of the axis in areas between two adjacent roller shells and thus a reduction in deformations due to the loading of the roller shells during operation in a continuous casting plant.
Eine erfindungsgemäße Stranggießanlage weist mehrere hintereinander angeordnete erfindungsgemäße Strangführungsrollen mit den oben genannten Vorteilen auf.A continuous casting plant according to the invention has a plurality of strand guide rollers according to the invention arranged one behind the other with the above-mentioned advantages.
Die erfindungsgemäße Aufgabe wird ebenfalls durch das Verfahren zur Kühlung einer Strangführungsrolle mit einem Kühlfluid nach Anspruch 9 gelöst.The object according to the invention is also achieved by the method for cooling a strand guide roller with a cooling fluid according to
Dabei wird das Kühlfluid von einer Kühlmittelzuführung in einen axial angeordneten Achsenhohlraum der stillstehenden Achse der Strangführungsrolle eingeleitet. Da die Achse stillsteht, kann dies ohne eine komplizierte und wartungsintensive Dreheinführung erfolgen. Anschließend wird das Kühlfluid in zumindest eine im Wesentlichen radial angeordnete Radialöffnung der Strangführungsrolle umgeleitet. Dadurch wird das Kühlfluid vom typischerweise zentral angeordneten Achsenhohl Z -raum in Richtung Rollenmantel geleitet. Sodann wird das Kühlfluid in einen Ringhohlraum eingeleitet, wodurch die Dichtung über den Steg zwischen dem Ringhohlraum und der Dichtung gekühlt wird. Nach diesem Schritt wird das Wälzlager, vorzugsweise in axialer Richtung, durchströmt. Hierdurch wird das Lager gekühlt und etwaiger Abrieb vom Lager abgeführt. Danach wird das Kühlfluid in einen zwischen dem Rollenmantel und der stillstehenden Achse angeordneten Kühlmittelkanal eingeleitet und der Kühlkanal helixartig um die Achse entlang einer Innenoberfläche eines Rollenmantels durchströmt, wodurch der Rollenmantel abgekühlt wird.In this case, the cooling fluid is introduced from a coolant supply into an axially arranged axis cavity of the stationary axis of the strand guide roller. Because the axis is stationary, this can be done without a complicated and high-maintenance rotary union. The cooling fluid is then diverted into at least one essentially radially arranged radial opening of the strand guide roller. This frees the cooling fluid from the typically centrally located axle cavity Z -space directed towards the roll shell. The cooling fluid is then introduced into an annular cavity, thereby cooling the seal across the web between the annular cavity and the seal. After this step, the rolling bearing is traversed, preferably in the axial direction. This cools the bearing and removes any abrasion from the bearing. The cooling fluid is then introduced into a coolant channel arranged between the roller shell and the stationary axle and flows through the cooling channel in a helical manner around the axis along an inner surface of a roller shell, as a result of which the roller shell is cooled.
Es ist vorteilhaft, wenn das Kühlmedium durch mehrere, bevorzugt zumindest vier, Radialöffnungen dem Ringhohlraum zugeführt wird. Dies stellt ein gleichmäßiges Geschwindigkeitsprofil bei der Durchströmung des Wälzlagers sicher.It is advantageous if the cooling medium is supplied to the annular cavity through a plurality of, preferably at least four, radial openings. This ensures a uniform velocity profile when flowing through the roller bearing.
Es ist vorteilhaft, wenn das Kühlmedium den Kühlmittelkanal in axialer und in tangentialer Richtung entlang einer Kühlfluidleithülse durchströmt. Dadurch wird einerseits eine hohe Durchflussgeschwindigkeit erreicht, was sich wiederum günstig auf die Wärmeabfuhr vom heißen Rollenmantel auswirkt. Außerdem wird eine gleichmäßige Temperaturverteilung des Rollenmantels in axialer und tangentialer Richtung erreicht.It is advantageous if the cooling medium flows through the coolant channel in the axial and in the tangential direction along a coolant-guiding sleeve. On the one hand, this achieves a high flow rate, which in turn has a positive effect on the heat dissipation from the hot roller shell. In addition, an even temperature distribution of the roller shell in the axial and tangential direction is achieved.
Nach dem Durchströmen des Kühlmittelkanals wird vorteilhafterweise ein zweites Wälzlager durchströmt und das Kühlfluid in einen zweiten Ringhohlraum eingeleitet, anschließend das Kühlfluid in eine weitere zumindest eine radiale Radialöffnung umgeleitet, von der radialen Richtung in eine axiale Richtung umgeleitet und in den axialen Achsenhohlraum eingeleitet. Beispielsweise wird durch einen Propfen der Achsenhohlraum der Zu- und Ableitung des Kühlfluids getrennt. Schließlich wird das Kühlfluid aus dem Achsenhohlraum abgeleitet. Die Ableitung kann entweder auf derselben Seite wie die Einleitung oder auf der gegenüberliegenden Seite der Einleitung erfolgen.After the coolant channel has flowed through, it advantageously flows through a second roller bearing and the cooling fluid is introduced into a second annular cavity, then the cooling fluid is diverted into at least one further radial opening, diverted from the radial direction into an axial direction and introduced into the axial axis cavity. For example, the axial cavity of the inlet and outlet lines of the cooling fluid is separated by a plug. Finally, the cooling fluid is drained from the axle cavity. The derivation can either be on the same page as the introduction or on the opposite side of the introduction.
Die oben beschriebenen Eigenschaften, Merkmale und Vorteile dieser Erfindung sowie die Art und Weise, wie diese erreicht werden, werden klarer und deutlicher verständlich im Zusammenhang mit der folgenden Beschreibung von Ausführungsbeispielen, die im Zusammenhang mit den Zeichnungen näher erläutert werden. Dabei zeigen:
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FIG 1 eine aufgebrochen und teilweise geschnitten dargestellte Seitenansicht einer Strangführungsrolle, -
FIG 2 schematisch einen Ausschnitt einer Stranggießanlage, und -
FIG 3 einen Ausschnitt aus einer Schnittdarstellung mit einer Seitenansicht einer weiteren Strangführungsrolle.
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FIG 1 a broken and partially sectioned side view of a strand guide roller, -
FIG 2 schematically a section of a continuous casting plant, and -
3 a detail of a sectional view with a side view of another strand guide roller.
Einander entsprechende Teile sind in den Figuren mit den gleichen Bezugszeichen versehen.Corresponding parts are provided with the same reference symbols in the figures.
Der Weg des Kühlfluids ist in den Figuren durch Pfeile darstellt.The path of the cooling fluid is represented by arrows in the figures.
Die Strangführungsrolle 1 umfasst eine feststehende Achse 3, einen Rollenmantel 5, Wälzlager 7, eine Kühlfluidleithülse 11, Dichtungshalterungen 13, Anlaufscheiben 15, Stützblöcke 17, Dichtringe 19, eine Dichtung 20 und eine Schmutzdichtung 21, wenigstens einen Pfropfen 24 und Kühlfluidzuführungen 26. In
Die Achse 3 ist als ein rohrartiger Hohlkörper mit einem kreisringförmigen Querschnitt ausgebildet, der einen axial verlaufenden kreiszylindrischen Achsenhohlraum 28 umgibt. In dem Achsenhohlraum 28 ist wenigstens ein den Achsenhohlraum 28 unterteilender Pfropfen 24 angeordnet, durch den ein zwischen ihm und einer Kühlfluidzuführung 26 liegender Kühlhohlraum 30 in dem Achsenhohlraum 28 definiert wird, in den und aus dem ein Kühlfluid durch eine (nicht dargestellte) Öffnung in der Kühlfluidzuführung 26 leitbar ist. Der Pfropfen 24 ist durch eine mit ihm verbundene Pfropfenstange 25 in den Achsenhohlraum 28 einführbar.The
Der Rollenmantel 5 ist rohrartig mit einem kreisringförmigen Querschnitt ausgebildet und umgibt einen Achsenabschnitt der Achse 3 koaxial. Zwischen dem Rollenmantel 5 und der Achse 3 sind die Dichtungshalterungen 13, die Kühlfluidleithülse 11 und die Wälzlager 7 angeordnet.The
Jede Dichtungshalterung 13 ist zwischen einem Endbereich des Rollenmantels 5 und der Achse 3 angeordnet, umgibt die Achse 3 ringförmig und ist fest mit der Achse 3 verbunden. Jede Dichtungshalterung 13 weist achsenseitig mehrere ringförmige Ausnehmungen auf, in denen jeweils ein erster Dichtring 19 angeordnet ist, der an der Achse 3 anliegt und diese ringförmig umgibt. Rollenmantelseitig weist jede Dichtungshalterung 13 zwei weitere ringförmige Ausnehmungen auf, in denen eine Schmutzdichtung 21 und eine Dichtung 20 angeordnet sind, der an dem Rollenmantel 5 anliegt und gegenüber dem der Rollenmantel 5 beweglich ist. Die näher am Ende des Rollenmantels 5 angeordnete rollenmantelseitige Schmutzdichtung 21 dient der Abdichtung gegen Schmutz aus der Umgebung der Strangführungsrolle 1, die Dichtung 20 dient der Abdichtung gegen einen Austritt von Kühlfluid aus der Strangführungsrolle 1.Each
Ferner weist jede Dichtungshalterung 13 eine Halterungsöffnung 32 auf, die eine Radialöffnung 34 in der Achse 3 mit einer Kühlfluidkammer 31 zwischen der Dichtungshalterung 13 und dem Wälzlager 7 verbindet. Dabei ist die Radialöffnung 34 mit einem Kühlhohlraum 30 der Achse 3 verbunden, so dass durch die Radialöffnung 34 und die Halterungsöffnung 32 Kühlfluid zwischen dem Kühlhohlraum 30 und der Kühlfluidkammer 31 strömen kann.Furthermore, each
Die Kühlfluidleithülse 11 ist axial zwischen den Wälzlagern 7 angeordnet, rohrartig ausgebildet und umgibt die Achse 3 koaxial. Die Kühlfluidleithülse 11 weist eine dem Rollenmantel 5 zugewandte rinnenartige Kühlkanalausnehmung 38 auf, die helixartig um die Achse 3 herum verläuft. Die Kühlkanalausnehmung 38 bildet dadurch einen zusammenhängenden Kühlkanal 40, der helixartig entlang der Innenoberfläche des Rollenmantels 5 verläuft.The cooling
Durch die Wälzlager 7 ist der Rollenmantel 5 um die Achse 3 drehbar gelagert. Jedes Wälzlager 7 weist einen an dem Rollenmantel 5 anliegenden und um die Achse 3 verlaufenden Au-ßenring 7.1, einen an der Achse 3 anliegenden und um die Achse 3 verlaufenden Innenring 7.2 und mehrere zwischen dem Au-ßenring 7.1 und dem Innenring 7.2 angeordnete Wälzkörper 7.3 auf. Hierbei ist der Außenring 7.1 (möglich wäre es aber auch den Innenring 7.2 und/oder die Wälzkörper 7.3) des Wälzlagers 7 aus einem korrosionsbeständigen Federband hergestellt, sodass das Wälzlager (auch Federrollenlager genannt) in zu einer Längsachse der Achse 3 orthogonalen Richtungen elastisch deformierbar ausgebildet. Die Wälzlager 7, d. h. die Außenringe 7.1, Innenringe 7.2 und Wälzkörper 7.3, sind aus einem korrosionsbeständigen Stahl ausgeführt, um gegen Korrosion durch einen Kontakt mit dem Kühlfluid geschützt zu sein.The
Jedes Wälzlager 7 weist einen zwischen dem Außenring 7.1 und dem Innenring 7.2 liegenden Lagerinnenraum 9 auf, der für das Kühlfluid durchlässig und zu dem Kühlkanal 40 und der an das Wälzlager 7 angrenzenden Kühlfluidkammer 31 offen ist, so dass das Kühlfluid durch den Lagerinnenraum 9 zwischen der Kühlfluidkammer 31 und dem Kühlkanal 40 strömen kann. Dadurch bilden die Kühlhohlräume 30 und Radialöffnungen 34 in der Achse 3, die Halterungsöffnungen 32, die Kühlfluidkammern 31, die Lagerinnenräume 9 der Wälzlager 7 und der Kühlkanal 40 einen zusammenhängenden Aufnahmeraum für Kühlfluid zur Kühlung des Rollenmantels 5. Das Kühlfluid wird durch wenigstens eine Öffnung in einer Kühlfluidzuführung 26 in diesen Aufnahmeraum eingeleitet und durch wenigstens eine Öffnung in der anderen Kühlfluidzuführung 26 aus ihm heraus geleitet.Each roller bearing 7 has a bearing interior 9 located between the outer ring 7.1 and the inner ring 7.2, which is permeable to the cooling fluid and is open to the cooling
Die ringförmigen Anlaufscheiben 15 sind jeweils als ein Puffer zur Aufnahme von Axialkräften zwischen einer Dichtungshalterung 13 und dem Außenring 7.1 eines Wälzlagers 7 angeordnet. Optional ist an einem der benachbarten Dichtungshalterung 13 zugewandten Ende des Innenrings 7.2 jedes Wälzlagers 7 ein Sicherungsring 22 zur Lagefixierung des Wälzlagers 7 angeordnet.The ring-shaped
Alternativ können die Anlaufscheiben 15 zur Aufnahme der Axialkräfte auch zwischen dem Rollenmantel 5 und dem Innenring 7.2 oder zwischen der Kühlfluidleithülse 11 und dem Innenring 7.2 angeordnet werden. Die Kühlfluidleithülse 11 kann bei Bedarf fest, beispielsweise form- und kraftschlüssig durch Einpressen, mit dem Rollenmantel 5 verbunden sein.Alternatively, the
Die Stützblöcke 17 umgeben ringfömig jeweils einen Endbereich der Achse 3 und dienen der Abstützung der Strangführungsrolle 1 gegen ein tragendes (nicht dargestelltes) Bauteil. Jeder Stützblock 17 liegt an einem Ende der benachbarten Dichtungshalterung 13 an, das aus dem Rollenmantel 5 herausragt.The support blocks 17 surround an end region of the
Das in
In der
Obwohl die Erfindung im Detail durch bevorzugte Ausführungsbeispiele näher illustriert und beschrieben wurde, so ist die Erfindung nicht auf die offenbarten Ausführungsbeispiele eingeschränkt.Although the invention has been illustrated and described in detail by means of preferred exemplary embodiments, the invention is not restricted to the exemplary embodiments disclosed.
- 11
- Strangführungsrollestrand guide roller
- 33
- Achseaxis
- 55
- Rollenmantelroll coat
- 77
- Wälzlagerroller bearing
- 7.17.1
- Außenringouter ring
- 7.27.2
- Innenringinner ring
- 7.37.3
- Wälzkörperrolling elements
- 99
- Lagerinnenraumwarehouse interior
- 1111
- Kühlfluidleithülsecooling fluid guide sleeve
- 1313
- Dichtungshalterungseal bracket
- 1515
- Anlaufscheibethrust washer
- 1717
- Stützblocksupport block
- 1919
- Dichtringsealing ring
- 2020
- Dichtungpoetry
- 2121
- Schmutzdichtungdirt seal
- 2222
- Sicherungsringlocking ring
- 2424
- PfropfenGraft
- 2525
- Pfropfenstangeplug rod
- 2626
- Kühlfluidzuführungcooling fluid supply
- 2828
- Achsenhohlraumaxle cavity
- 3030
- Kühlhohlraumcooling cavity
- 3131
- Kühlfluidkammercooling fluid chamber
- 3232
- Halterungsöffnungbracket opening
- 3434
- Radialöffnungradial opening
- 3838
- Kühlkanalausnehmungcooling channel recess
- 4040
- Kühlkanalcooling channel
- 4141
- Ringhohlraumring cavity
- 4242
- Absperrblechbarrier plate
- 100100
- Stranggießanlagecontinuous caster
- 102102
- Kokillemold
Claims (12)
- Strand guiding roller (1) for guiding a metallic strand in a continuous casting facility (100), comprising- a fixed axle (3);- at least one roller shell (5) which coaxially surrounds an axle portion of the axle (3);- for each roller shell (5) at least one cooling duct (40), which runs along the internal face of the roller shell (5), for receiving a coolant and for cooling the roller shell (5);- and for each roller shell (5) at least one roller bearing (7) for mounting the roller shell (5) so as to be rotatable about the axle (3), said roller bearing (7) being disposed between the axle portion that is surrounded by the roller shell (5) and the roller shell (5) ;- wherein the roller bearing (7) is adjacent to a cooling duct (40) and has a bearing interior space (9) which is permeable to the coolant and is open towards the cooling duct (40) so that the roller bearing (7) during operation is passed through by a flow of the coolant;- wherein the roller bearing (7) has an outer race (7.1) which bears on a roller shell (5) and encircles the axle (3), an inner race (7.2) which bears on the axle (3) and encircles the axle (3), and a plurality of rolling members (7.3) which are disposed between the outer race (7.1) and the inner race (7.2), characterizedin that the roller bearing (7) is made from a corrosion-resistant steel and is embodied for a lubricant-free operation;in that at least one element of the group of outer race (7.1), inner race (7.2) and rolling member (7.3) of at least one roller bearing (7) is configured to be elastically deformable in at least one direction orthogonal to a longitudinal axis of the axle (3); andin that at least one cooling duct (40) along an internal surface of a roller shell (5) runs helically about the axle (3).
- Strand guiding roller (1) according to Claim 1, characterized in that the cooling duct (40) on an end side of the strand guiding roller (1) is sealed by a seal mount (13) having a seal (20) between the roller shell (5) and the seal mount (13).
- Strand guiding roller (1) according to Claim 2, characterized in that the roller shell (5) in the radial direction outside the seal (20) has an annular cavity (41) which is connected to the cooling duct (40) so that the seal (20) is cooled by the coolant even when the strand guiding roller (1) is stationary.
- Strand guiding roller (1) according to one of the preceding claims, characterized by at least one tubular coolant guide sleeve (11) which is disposed between the axle (3) and a roller shell (5) and for configuring a cooling duct (40) has at least one channel-type cooling duct recess (38) which faces the roller shell (5).
- Strand guiding roller (1) according to one of the preceding claims, characterized in that a thrust washer (15) for compensating axial relative movements is disposed between the seal mount (13) and the roller bearing (5), or between the roller bearing (5) and the coolant guide sleeve (11).
- Strand guiding roller (1) according to Claim 5, characterized in that the thrust washer is produced from polyether ether ketone (PEEK).
- Strand guiding roller (1) according to one of the preceding claims, characterized in that the axle (3) has at least one cooling cavity (30) which is able to be filled with coolant and is connected to at least one bearing interior space (9) of a roller bearing (7) and to at least one cooling duct (40) so that the cooling cavity (30), the bearing interior space (9) and the cooling duct (40) form a contiguous receptacle space for coolant.
- Strand guiding roller (1) according to Claim 7, characterized in that all cooling ducts (40), bearing interior spaces (9) of the roller bearings (7) and cooling cavities (30) are connected to one another so as to form a contiguous receptacle space for coolant.
- Method for cooling a strand guiding roller (1), in particular according to one of the preceding claims, with a coolant,- wherein the strand guiding roller (1) has a stationary axle (3) having an axial axle cavity (28) and a roller shell (5);- wherein the roller shell (5) by at least one roller bearing (7) is mounted so as to be rotatable in relation to the axle (3), and there is a cooling duct (40) present between the roller shell (5) and the axle (3), wherein the cooling duct (40) at the end side is sealed by a seal mount (13) having a seal (20);- wherein the roller bearing (7) has an outer race (7.1) which bears on a roller shell (5) and encircles the axle (3), an inner race (7.2) which bears on the axle (3) and encircles the axle (3), and a plurality of rolling members (7.3) which are disposed between the outer race (7.1) and the inner race (7.2); and- wherein at least one element of the group of outer race (7.1), inner race (7.2) and rolling member (7.3) of at least one roller bearing (7) is configured to be elastically deformable in at least one direction orthogonal to a longitudinal axis of the axle (3); said method comprising the following steps:- directing the coolant from a coolant supply (26) into the axial axle cavity (28);- redirecting the coolant into at least one substantially radial radial opening (34) of the strand guiding roller (1);- directing the coolant into an annular cavity (41), as a result of which the coolant in the annular cavity (41) cools the seal (20);- passing a flow through the roller bearing (7);- directing the coolant into the cooling duct (40);- passing a flow through the cooling duct (40), as a result of which the roller shell (5) is cooled down, wherein the cooling medium along an internal surface of a roller shell (5) flows through the cooling duct (40) helically about the axle (3).
- Method according to Claim 9, characterized in that the cooling medium is redirected through a plurality of, preferably at least four, radial openings (34).
- Method according to Claim 9 or 10, characterized in that the cooling medium flows through the cooling duct (40) in an axial and in a tangential direction along a coolant guide sleeve (11).
- Method according to one of Claims 9 to 11, characterized by- the passing of a flow through a second roller bearing;- the directing of the coolant into a second annular cavity (41), as a result of which the coolant in the second annular cavity cools a second seal;- the redirecting of the coolant into a further at least one substantially radial radial opening of the strand guiding roller (10); and- the discharging of the coolant from an axial axle cavity into a coolant discharge.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT500272016 | 2016-01-21 | ||
PCT/EP2017/051146 WO2017125529A1 (en) | 2016-01-21 | 2017-01-20 | Strand guiding roller for guiding a metal strand in a continuous casting facility |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3405302A1 EP3405302A1 (en) | 2018-11-28 |
EP3405302B1 true EP3405302B1 (en) | 2023-08-30 |
EP3405302C0 EP3405302C0 (en) | 2023-08-30 |
Family
ID=57860871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP17700969.3A Active EP3405302B1 (en) | 2016-01-21 | 2017-01-20 | Strand guiding roller for guiding a metal strand in a continuous casting facility |
Country Status (2)
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EP (1) | EP3405302B1 (en) |
WO (1) | WO2017125529A1 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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EP3562286A1 (en) * | 2018-04-25 | 2019-10-30 | Siemens Aktiengesellschaft | Baking tray and method for its manufacture |
AT526034A1 (en) * | 2022-08-09 | 2023-08-15 | Primetals Technologies Austria GmbH | Strand guide roller for guiding a metallic strand in a continuous casting plant |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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FR2545891B1 (en) * | 1982-10-21 | 1990-11-16 | Kastner Rene | ROLLER BEARING CAPABLE OF OPERATING AT HIGH TEMPERATURE AND WITHOUT LUBRICATION, AND CONTINUOUS CASTING MACHINE ROLLERS EQUIPPED WITH SUCH BEARINGS |
AT514625B1 (en) * | 2013-07-24 | 2018-07-15 | Primetals Technologies Austria GmbH | Chilled strand guide roller |
-
2017
- 2017-01-20 EP EP17700969.3A patent/EP3405302B1/en active Active
- 2017-01-20 WO PCT/EP2017/051146 patent/WO2017125529A1/en active Application Filing
Also Published As
Publication number | Publication date |
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EP3405302A1 (en) | 2018-11-28 |
WO2017125529A1 (en) | 2017-07-27 |
EP3405302C0 (en) | 2023-08-30 |
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