EP3934828A1 - Strand guide and method for guiding a cast strand from a mould - Google Patents
Strand guide and method for guiding a cast strand from a mouldInfo
- Publication number
- EP3934828A1 EP3934828A1 EP20710473.8A EP20710473A EP3934828A1 EP 3934828 A1 EP3934828 A1 EP 3934828A1 EP 20710473 A EP20710473 A EP 20710473A EP 3934828 A1 EP3934828 A1 EP 3934828A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- segment
- strand
- path
- strand guide
- limiting element
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 54
- 238000006073 displacement reaction Methods 0.000 claims abstract description 26
- 238000011144 upstream manufacturing Methods 0.000 claims description 14
- 229920001971 elastomer Polymers 0.000 claims description 3
- 239000000806 elastomer Substances 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 230000005484 gravity Effects 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010972 statistical evaluation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
-
- 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
- B22D11/14—Plants for continuous casting
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
Definitions
- the invention relates to a strand guide and a method for guiding a cast strand after it has emerged from a mold.
- the mold and the strand guide are typically components of a casting plant for casting metal, in particular steel.
- a strand guide with a plurality of segments arranged one behind the other in the casting direction is known from the German patent application with the file number DE 10 2017 221 756.1, a segment zero being the first segment in the casting direction behind the mold.
- a rotary bearing for segment zero is known from this patent application for connecting segment zero to the fixed side of the strand guide.
- the segment can be moved freely in the x direction. As a result, there is a risk that the cold strand could damage the copper plates on the inside of the mold when it is introduced into the mold.
- the invention is based on the object of developing a known strand guide and a known method for its operation in such a way that the risk of damage to strand guide rollers in a segment or that of the inner walls or copper plates of the mold is reduced by a cold strand guided in the strand guide.
- the strand guide claimed is characterized by at least one path limiting element for limiting a displacement path of the segment mounted on the floating bearing in the x direction.
- the coordinate system specified in the figures applies to the definition of the x, y and z directions.
- z basically denotes the vertical and x and y basically span a plane in the horizontal plane.
- y denotes the width direction of the strand and x the direction perpendicular to the broad side of the cast strand.
- the said coordinates are not restricted to the pure vertical and the pure horizontal. Rather, the z-direction can also mean the casting direction.
- the x, y plane is then also perpendicular to the z direction.
- the x-direction then designates the radial direction of the arc of the strand guide.
- the y-direction always remains the width direction of the cast strand.
- segment as part of a strand guide means an upper frame and a lower frame, on each of which strand guide rollers are rotatably mounted.
- the upper frame and the company are connected to one another via typically four tie rods or hydraulic cylinders.
- the strand guide rollers of the upper frame and the strand guide rollers of the lower frame are arranged opposite one another and form a channel for guiding the cast strand when it is pulled out of the mold.
- a plurality of segments are typically arranged one behind the other in the casting direction for guiding the cast strand.
- segment zero refers to the first segment in the strand guide in the casting direction behind the mold.
- the claimed path-limiting elements are advantageously used for the targeted setting of a guide path for, in particular, the cold strand within a strand guide.
- the freedom of movement of the segments in the x-direction is limited to such stop positions that the risk of damage to the inner walls or the copper plates of the mold or the strand guide rollers of neighboring ones Segments, in particular by a cold strand introduced into the strand guide counter to the casting direction, is advantageously very significantly reduced.
- the path limiting element is a fixed-side upper path limiting element, which is preferably designed to be adjustable to limit the displacement path of the segment mounted on the floating bearing in the x direction to a stop position in which the trailing edge of the strand is aligned on the input side of the segment is aligned with the trailing edge strand of the segment upstream of the casting direction - or, if the segment mounted on the floating bearing is segment zero - with the trailing edge strand of the outlet of the mold upstream of the casting direction.
- the term “trailing edge strand” means less the strand itself, but the stop position for the strand defined by the strand guide rollers on the fixed side of the segments, in particular towards its trailing edge when it is passed through the segments.
- the term “leading edge of the strand” means the stop position for the strand defined by the strand guide rollers on the loose side of the segments.
- the path-limiting element can also be a loose-side upper path-limiting element.
- This is preferably designed to be adjustable to limit the displacement path of the segment mounted on the floating bearing in the x direction to a stop position in which the leading edge strand on the input side of the segment is aligned with the leading edge strand of the segment upstream of the casting direction - or if it is in the segment mounted on the floating bearing around the Segment zero acts - is aligned with the leading edge strand of the outlet of the mold upstream of the casting direction.
- a fixed-side lower path limiting element can also be provided and preferably designed to be adjustable to limit the displacement path of the segment mounted on the floating bearing in the x direction to a stop position in which the trailing edge strand on the output side of the segment is aligned with the trailing edge strand of the Input side of the following segment in the casting direction is aligned.
- This alignment has the specific advantage that damage by the cold strand head on the strand guide rollers on the exit side of a segment, in particular segment zero in the strand guide, is prevented.
- All three exemplary embodiments described offer the advantage that the path for a cold strand in a strand guide in the x-direction, i.e. laterally, is limited in such a way that the cold strand does not hit a strand guide roller or the inside of the mold and does not damage it as a result of the impact.
- the claimed path limitation for a segment advantageously only takes place before the start of an actual casting sequence, namely during the entry of the cold strand into the strand guide and / or during casting, i.e. when the cold strand with the front end of the cast strand attached to it in the casting direction from the Mold and the strand guide is pulled out. Thereafter, ie after the cold strand has been separated from the cast strand and during the actual casting operation, the path limitation is advantageously lifted so that the segment, in particular segment zero, is then freely moveable in the x direction, i.e. at least no longer limited by the path limitation elements is.
- a control device for moving at least one of the path limiting elements into its respective stop position during the
- control device is designed to move back at least one of the path-limiting elements from its stop position into a rest position in which the displacement in the x-direction is enabled for the segment during a casting operation.
- control device is designed in the form of a manually operated switch. Alternatively, however, it can also be designed for electronic or hydraulic or pneumatic control and setting of the path-limiting elements.
- the upper and / or lower path limiting elements can be formed by springs, either plate spring assemblies or spiral springs or dampened by an elastomer. This advantageously avoids damage to the surface of the cast strand.
- the path-limiting elements can be designed as plunger cylinders or as hydraulic cylinders.
- at least one travel measuring device and / or a pressure measuring device is assigned to the travel limiting elements for detecting the respective position of the travel limiting elements or their displacement paths and / or for detecting the pressures on the contact surface of the travel limiting elements Strand, each preferably as a function of time.
- Figure 2 shows a receptacle according to the invention for a pivot bearing
- FIG. 3 shows the strand guide according to the invention with the in his
- FIG. 1 shows a casting system with a mold 200 and a strand guide 100 downstream of the mold in the casting direction G.
- the strand guide serves to guide a cast strand after it has emerged from the mold 200.
- the strand guide 100 comprises a plurality of one behind the other in the casting direction G arranged segments 110-0, 1 10-1, the segment zero 100-0 denoting the first segment in the casting direction G behind the mold 200.
- the segment zero is rotatably mounted on a pivot bearing 120 about the y-axis.
- the pivot bearing 120 in FIG. 1 is arranged on the input side of the segment zero facing the output of the mold 200. Its axis of rotation is advantageously at the same level or on a line with the axes of rotation of the two first strand guide rollers 112 on the input side E of segment zero 110-0.
- the segment zero is suspended from the pivot bearing in a pendulum fashion.
- the extension of the zero segment above the axis of rotation of the rotary bearing 120 is therefore negligible compared to the extension of the zero segment in the casting direction below the axis of rotation.
- the oscillation path of the input side of segment zero in the x-direction is small compared to the oscillation path in the x-direction at the output of segment zero 110-0.
- the pivot bearing 120 is mounted displaceably in a receptacle 130 in the x direction.
- the pivot bearing 120 and the receptacle 130 together form a floating bearing.
- the receptacle 130 is fixedly arranged, for example, on the support frame of an oscillator device (not shown) for the mold, this support frame in turn being connected to the foundation.
- the segment is rotatably mounted on the pivot bearing and can be displaced together with the pivot bearing within the receptacle in the x direction.
- the pivot bearing it would also be possible for the pivot bearing to be firmly connected to the foundation and for the receptacle (130) with the segment (110) connected to it to be displaceable in the x direction to be rotatably mounted on the pivot bearing (120).
- Figure 2 shows the receptacle 130 for the pivot bearing 120 in a perspective detailed illustration.
- a plurality of path limiting elements 140-n with n 1...
- N can be seen, in particular (upper) path limiting elements 140-1, 140-2 for limiting the displacement of the rotary bearing 120 in the x direction when it is inserted into the receptacle is (not shown).
- the pivot bearing (120) also limits the freedom of movement of the segment zero 110-0 on the fixed side 100-F and preferably also on the loose side 100-L of the strand guide 100 in its pendulum fashion in the x-direction.
- the upper path limiting element 140-1 is preferably designed to be adjustable to limit the displacement of the pivot bearing 120 or the segment on the fixed side 100-F of the strand guide to a stop position such that the "trailing edge strand" on the input side of the segment zero 110-0 aligned with the "trailing edge strand” of the exit of the mold 200.
- the upper loss-side path limiting element 140-2 is preferably adjustable to limit the displacement of the pivot bearing or the segment on the loose side 100-L of the strand guide 100 to such a stop position that the "leading edge strand" 111-2 on the input side of the Segment zero 110-0 is aligned with the "leading edge strand" of the exit of the mold 200.
- the travel limiting elements are typically designed in the form of plunger cylinders or hydraulic cylinders. They can be mounted in a damped manner, for example by means of disk spring assemblies 165, as shown in FIG. Alternatively, the disk spring assemblies can also be replaced by a spiral spring or by an elastomer as a buffer element.
- the strand guide 100 according to the invention also has a lower delimiting element 140-3 which is attached to the Segment support frame or is attached to an upper storage of the support frame.
- the lower path limiting element 140-3 serves to limit the pendulum and / or displacement movement of the segment zero in the x direction on the fixed side 100-F of the strand guide. Specifically, the lower movement element 140-3 can be adjusted to such a stop position in which the “rear edge
- the lower path limiting element 140-3 can be designed in the same way as the upper path limiting elements 140-1, 140-2 in the form of plunger or hydraulic cylinders, each with or without buffer elements.
- a path measuring device 160 can be assigned to the upper and / or lower path limiting element 140, as can be seen in FIG. The distance measuring device 160 is used to detect the stop positions of the
- Path limitation elements preferably as a function of time, for statistical or evaluation purposes.
- the path limiting elements 140 can also each be assigned a pressure measuring device 170 for detecting the forces exerted on the (cold) strand by the path limiting elements in their stop positions.
- the path-limiting elements in the form of plunger or hydraulic cylinders are preferably integrated into the side walls of the receptacle 130, as shown in FIG.
- This arrangement of the path-limiting elements 140 is recommended in particular for the oscillating suspension of segment zero, shown in FIG. 1, on its input side facing the exit of the mold 200.
- this pendulum suspension of segment zero is by no means mandatory; rather, segment zero can also be achieved with the aid of the pivot bearing 120 be rotatably mounted in its center of gravity, for example, as shown in FIG.
- the present invention provides that the path-limiting elements - regardless of the location of the rotary bearing of the segment - are always arranged at the level of the input side and / or at the output side of the segment, as shown in FIG. Only then is it guaranteed that the path limiting elements 140 ensure the function intended for them, namely ensure a smooth transition from a strand guided in the segment to an upstream component, be it a mold or an upstream segment, or to a downstream segment.
- FIG. 3 also shows a fourth possible path limiting element 140-4 on the loose side at the exit of segment zero. It serves to limit the pendulum and / or displacement movement of segment zero in the x-direction on the loose side 100-L of the strand guide 100.
- this fourth path limiting element 140-4 can be set to such a stop position that the leading edge of the strand at the downstream exit of the segment is aligned with the leading edge strand at the downstream entrance of the following segment.
- a cold strand is typically first of all through the segments counter to the casting direction G up to the exit of the mold 200 introduced.
- the cold strand is used to close the mold before it is filled with molten metal for a new casting sequence.
- the cold strand then typically connects to the front end of the cast strand and it serves to pull the still fresh cast strand out of the mold 200 (casting). For this purpose, the direction of movement of the cold strand is reversed and it is pulled out of the strand guide in the casting direction.
- the method according to the invention provides that the following steps are carried out before the cold strand enters segment zero 110-0 or before the start of casting: Rotatable mounting of the segment, in particular the segment zero
- the displacement of the pivot bearing with the segment attached to it is limited, in particular on the fixed side 100-F of the strand guide, to a stop position in which the trailing edge strand on the input side of segment zero is aligned with the trailing edge strand of the exit of the mold 200.
- the movement of segment zero in the x direction is preferably also limited at its output.
- the movement of the output side of segment zero in the x direction that occurs there due to a pendulum and / or displacement movement of segment zero is limited to a stop position in which the trailing edge strand 116-1 on the output side A of segment zero is aligned with the "trailing edge Strand “116-2 of the input side E of the following segment one is aligned.
- at least one of the path limitation elements 140 is moved from a rest position into its respective stop position with the aid of a control device 150.
- the said path limit for segment zero on its input side E and / or its output side A can be abandoned for a subsequent casting operation.
- the respective path limiting element 140-1 ... -4 then moves - controlled by a control device 150 - from its stop position into a rest position.
- the segment zero is then freely movable in the x direction - preferably within predetermined enlarged travel limits - in the x direction and it can oscillate freely about the y axis in the rotary bearing 120.
- segment zero enables self-alignment of segment zero in the x-direction, in particular during the casting operation, ie while segment zero is continuously traversed by a cast strand.
- segment zero is advantageously automatically always correctly aligned with its inlet side on the outlet of the mold 200 and with its outlet side on the inlet of the subsequent segment one during the casting operation.
- the alignment is always carried out in such a way that as few forces as possible have to be applied to guide the cast strand.
- the inventive core idea of limiting the path of the segments of a strand guide in the x direction was described in the exemplary embodiments described above with reference to the figures primarily for the first segment in the casting direction behind the mold, ie for segment zero.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019203141.2A DE102019203141A1 (en) | 2019-03-07 | 2019-03-07 | Strand guide and method for guiding a cast strand from a mold |
PCT/EP2020/056002 WO2020178425A1 (en) | 2019-03-07 | 2020-03-06 | Strand guide and method for guiding a cast strand from a mould |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3934828A1 true EP3934828A1 (en) | 2022-01-12 |
EP3934828B1 EP3934828B1 (en) | 2023-06-28 |
Family
ID=69784433
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20710473.8A Active EP3934828B1 (en) | 2019-03-07 | 2020-03-06 | Strand guide and method for guiding a cast strand from a mould |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3934828B1 (en) |
DE (1) | DE102019203141A1 (en) |
WO (1) | WO2020178425A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT506836B1 (en) * | 2008-05-23 | 2011-08-15 | Siemens Vai Metals Tech Gmbh | CONTINUOUS CASTING SYSTEM FOR CASTING A METAL STRUCTURE WITH BUTTON OR SURFACE CROSS SECTION |
DE102010054398A1 (en) * | 2010-12-08 | 2012-06-14 | Sms Siemag Ag | continuous casting plant |
DE102017117634A1 (en) * | 2017-08-03 | 2019-02-07 | Salzgitter Flachstahl Gmbh | Optimized continuous casting plant and process for the optimized alignment of components of a continuous casting plant |
DE102017221756A1 (en) | 2017-08-04 | 2019-02-07 | Sms Group Gmbh | Storage for a segment in a strand guide |
-
2019
- 2019-03-07 DE DE102019203141.2A patent/DE102019203141A1/en not_active Withdrawn
-
2020
- 2020-03-06 WO PCT/EP2020/056002 patent/WO2020178425A1/en active Application Filing
- 2020-03-06 EP EP20710473.8A patent/EP3934828B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP3934828B1 (en) | 2023-06-28 |
WO2020178425A1 (en) | 2020-09-10 |
DE102019203141A1 (en) | 2020-09-10 |
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