EP0064238B1 - Verfahren und Vorrichtung zum Biegen eines Stranges in einer Stahlstranggiessanlage - Google Patents
Verfahren und Vorrichtung zum Biegen eines Stranges in einer Stahlstranggiessanlage Download PDFInfo
- Publication number
- EP0064238B1 EP0064238B1 EP82103442A EP82103442A EP0064238B1 EP 0064238 B1 EP0064238 B1 EP 0064238B1 EP 82103442 A EP82103442 A EP 82103442A EP 82103442 A EP82103442 A EP 82103442A EP 0064238 B1 EP0064238 B1 EP 0064238B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strand
- bending
- rollers
- bending curve
- pairs
- 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.)
- Expired
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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
- B22D11/1282—Vertical casting and curving the cast stock to the horizontal
Definitions
- the invention relates to a method for bending a strand in a continuous casting installation, in which the strand is bent along a bending curve between an arc-shaped and a straight support guideway with increasing or decreasing curvature, and in addition to absorb the ferrostatic pressure of the strand having a liquid core Support roller pairs which can be displaced transversely to the strand running direction, each having a predetermined roller spacing, and a device for carrying out the method.
- a strand guide for a continuous casting installation which has rigid pairs of rollers which can be moved through the strand both perpendicularly and perpendicular to the surface of the strand.
- the rigid and the movable roller pairs are arranged along a straight or circular longitudinal axis defined by the mold shape.
- the moving pairs of rollers adapt to the current shape of the strand as it passes through the strand within a defined range. Precise alignment of the movable rollers on the straight or circular Sfrang track can be omitted without disadvantage to the strand quality due to this scope.
- the strand leaves the strand guide in the same geometric shape as when it entered it, i.e. in a straight or circular arc shape.
- a drive straightening unit for straightening the strand is arranged downstream according to the conventional method.
- This drive leveling unit is due to the lack of support between the bending rollers. not suitable for slurry with a liquid core.
- this drive leveling unit works according to the single-point leveling concept with a correspondingly high elongation or change in elongation in the strand crust.
- This continuous caster is not suitable for strands with a high casting speed and the resulting liquid core in the straightening unit.
- a strand guide for supporting and guiding as well as for deflecting an only partially solidified strand is known.
- a roller is rigidly arranged in the pair of rollers of a straight and an arcuate part of the support guide adjoining the bending curve.
- pairs of rollers are arranged to support the ferrostatic pressure, at least four of these rollers being rigidly attached as force-transmitting bending or straightening rollers and two of which are provided on the tension fiber side and at least two on the compression fiber side of the strand.
- the invention has for its object to provide a method for bending a strand and a bending device, which overcome the disadvantages mentioned in the description of DE-A 2 341 563 and which stress the strand compared to this known bending method with lower elongation values and elongation rates on the one hand to avoid cracks in the surface crust surface and structural defects at the phase boundary solid-liquid and on the other hand to make the bending device simple and inexpensive to set up.
- the bending device, its adjustment, alignment and maintenance work along the transition curve are also to be significantly simplified.
- this object is achieved in that the strand is bent in the region of the bending curve by a constant bending moment, which is applied exclusively by rollers of the circular-arc-shaped and straight support guideway, and in that the displaceability of all the pairs of supporting rollers that take up the ferrostatic pressure is chosen along the bending curve, that their position adapts itself transversely to the bending curve to the respective casting and strand parameters of the bending strand.
- a device for solving this problem is defined in claim 2.
- a minimal constant rate of expansion occurs in the strand crust over the entire length of the bending curve and thus minimal stresses on the strand surface and on the solid-liquid phase boundary.
- a desired or permissible strain rate can be set by choosing the length of the bending curve. This results in strands that are free of cracks and structural defects, even with difficult-to-cast steel grades and / or at high casting speeds. All the rollers along the bending curve part between the curved and the straight part of the support guide do not transmit any transverse forces or no bending forces. The bending or straightening device can be built more simply and this results in cost savings.
- connection point of the bending curve on the circular arc can be chosen as desired. If, for example, the height of a continuous caster is to be low and only a low ferrostatic pressure is desired in the horizontal part of the guide, the connection point of the bending curve to the circular arc in the straightening part can be brought close to an arc mold with a relatively small radius.
- Optimal conditions for the position of the connection point circular arc - bending curve result if the bending curve adjoins the circular arc at an angle cp o , the angle cp o being measured from the horizontal radius curve when bending and from the vertical radius line of the circular curve when straightening and according to the formula is calculated.
- R o represents the selected radius of the circular arc and L the selected length of the bending curve.
- a distance Y o between a connection point on the circular arc and an extension of the straight strand path can be calculated as follows:
- R o represents the selected radius of the circular arc and L the selected length of the bending curve.
- Fig. 1 is a portion of a cast strand 1 with a liquid core 2 in a section of a support guide, which is composed of a straight part 4, a bending curve 16 and an arcuate part 6. All rollers 7-12 are arranged in such a way that they support the ferrostatic pressure of the liquid core 2 and thus can prevent the strand from bulging.
- Roller pairs 7, 7 'and 8, 8' are adjacent to the bending curve 16.
- the pair of rollers 7, 7 ' is the last in the straight part 4 of the support guide and the pair of rollers 8, 8' is the first in the arcuate part of the support guide.
- These rollers 8, 8 'and 7, 7' are usually rigidly attached to the machine stand.
- all pairs of support rollers 9, 10 are each freely movable in the direction of arrow 14 transversely to the strand running direction 13 through the strand 1.
- the strand 1 thus sets the pairs of rollers 9, 10 along the bending curve part 16 itself to an optimal bending curve.
- the pairs of support rollers 9, 10 can be rigidly connected by means of tabs 15 to keep the mutual distance.
- the tabs 15 or equivalent connection means absorb the force generated by the ferrostatic pressure. In order to limit overload forces at 110-120% of the supporting force for the ferrostatic pressure, the tabs 15 can be provided with appropriately designed known elastic overload safeguards.
- Roller pairs 11, 11 'in the straight part 4 or roller pairs 12, 12' in the arcuate part 6 of the support guide, which in FIG. 1 in the strand running direction 13 before or after the roller pair 7, 7 'or 8 adjacent to the bending curve part 16, 8 'are arranged, if desired, can also be freely moved through the strand 1 transversely to the strand running direction 13. These roles are also relieved of bending or reaction forces. It is advantageous if these forces are absorbed by rollers which are arranged far from the pair of rollers 7, 7 'or 8, 8'.
- FIG. 2 The same reference numerals are used in FIG. 2 as in FIG. 1. The difference from FIG. 2 to FIG. 1 is that a straight strand 1 is bent along the bending curve 16 in FIG. 1 and along the bending curve 16 ′ in FIG 2 a curved strand 18 is straightened.
- FIG 3 shows a bending curve 25 in the straightening area between connection points 20 and 21.
- a circular arc path with a radius R o is shown between point 20 and a point 22 and a straight path is shown between point 21 and point 23.
- Y o represents the height of the point 20 above the extension of the straight path, which also forms the X axis.
- An angle ⁇ o lies between a vertical radius line 24 and a straight line 26 running to the connection point 20.
- the position of the two connection points 20 and 21, given the radius R o for the circular arc and the horizontal length L of the bending curve 25, can be calculated as follows: the angle (p o , which is measured when bending from a horizontal radius line and when straightening from the vertical radius line 24 of the circular arc is calculated using the formula where R o represents the selected radius of the circular arc and L represents the selected length of the bending curve.
- the distance Y o between the connection point 20 de bending curve on the circular arc and an extension of the straight path (X-axis) can be according to the formula are calculated, where R o represents the selected radius of the circular arc and L represents the selected length of the bending curve.
- the strain rate on a fiber at a distance a from the neutral central axis of the strand is calculated as follows: where Vs represents the casting speed in mm. sec
- the elongation values in this example are approximately a power of 10 lower than with a similar strand guide with a one-point straightening unit.
- rollers 40 and 41 are fastened to yokes 45 and 46 by means of their bearings 43 and 44.
- the rollers 40 and 41 form a pair of support rollers, which could be arranged along a bending curve, but also along a curved or straight support guide.
- the yokes 45 and 46 are clamped together with force devices 50, 50 'against stops 51, 51', so that the pair of rollers 40, 41 forms a non-positively closed unit.
- Guides 47 are provided on both sides of the strand guide. These guide the yokes 45 and 46 so that the pair of rollers 40, 41 can be moved freely by strand 49 transversely to the strand running direction.
- the force devices 50, 50 ′ which are designed as a hydraulic piston-cylinder unit, support the ferrostatic pressure of the line 49. They have no bending or straightening forces to absorb. Instead of the power devices, tie rods or spindles could also be provided.
- the power device 50 'and the stop 51' are placed on the left side in FIG. 4 such that drive shafts 53 for the rollers 40, 41 can be brought out.
- FIG. 6 schematically shows a weight compensation for each pair of rollers 40, 41 in the form of a spring 55.
- a weight balance which is only necessary when the guides 47 are arranged vertically or at an angle, could also consist of a counterweight or a grease nut.
- the effectiveness of the weight compensation pond is usually only necessary until a start-up strand has entered the strand guide.
- the described method and the device are not only suitable for casting slab formats. Special advantages can also be achieved when casting large bloom formats and pre-profiles for supports (dogbones) because such pre-profiles place particularly high demands on the straightening process with regard to freedom from cracks.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT82103442T ATE25344T1 (de) | 1981-04-30 | 1982-04-23 | Verfahren und vorrichtung zum biegen eines stranges in einer stahlstranggiessanlage. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH2818/81 | 1981-04-30 | ||
CH2818/81A CH654767A5 (de) | 1981-04-30 | 1981-04-30 | Verfahren und vorrichtung zum biegen eines stranges in einer stahlstranggiessanlage. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0064238A1 EP0064238A1 (de) | 1982-11-10 |
EP0064238B1 true EP0064238B1 (de) | 1987-02-04 |
Family
ID=4242273
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82103442A Expired EP0064238B1 (de) | 1981-04-30 | 1982-04-23 | Verfahren und Vorrichtung zum Biegen eines Stranges in einer Stahlstranggiessanlage |
Country Status (9)
Country | Link |
---|---|
US (1) | US4465121A (ja) |
EP (1) | EP0064238B1 (ja) |
JP (1) | JPS57184565A (ja) |
AT (1) | ATE25344T1 (ja) |
AU (1) | AU548390B2 (ja) |
CA (1) | CA1186476A (ja) |
CH (1) | CH654767A5 (ja) |
DE (1) | DE3275357D1 (ja) |
ES (1) | ES8305609A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3303386A1 (de) * | 1983-02-02 | 1984-08-09 | SMS Schloemann-Siemag AG, 4000 Düsseldorf | Stuetzfuehrung in einer stranggiessanlage |
US4844145A (en) * | 1987-11-03 | 1989-07-04 | Steel Metallurgical Consultants, Inc. | Bending of continuously cast steel with corrugated rolls to impart compressive stresses |
US9134370B2 (en) | 1999-11-23 | 2015-09-15 | Mentor Graphics Corporation | Continuous application and decompression of test patterns and selective compaction of test responses |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1197837A (fr) * | 1957-01-11 | 1959-12-03 | Boehler & Co Ag Geb | Installation de coulée continue |
CH399659A (de) * | 1963-01-08 | 1965-09-30 | Concast Ag | Stranggussanlage |
DE1250973B (ja) * | 1963-05-03 | 1967-09-28 | ||
CH414957A (de) * | 1964-08-04 | 1966-06-15 | Concast Ag | Strangführung für Stranggussanlage |
JPS5030575B1 (ja) * | 1970-01-29 | 1975-10-02 | ||
SU349238A1 (ja) * | 1970-06-18 | 1974-05-05 | ||
AT331439B (de) * | 1973-07-24 | 1976-08-25 | Voest Ag | Strangfuhrung fur eine stranggiessanlage |
JPS50123036A (ja) * | 1974-03-18 | 1975-09-27 | ||
DE2461045C2 (de) * | 1974-12-20 | 1982-05-13 | Mannesmann AG, 4000 Düsseldorf | Strangführungsbahn für Stranggießanlagen |
JPS51147124U (ja) * | 1975-05-20 | 1976-11-26 | ||
US4058154A (en) * | 1976-09-23 | 1977-11-15 | Concast Incorporated New York | Guiding and supporting means for continuously cast metal strand |
-
1981
- 1981-04-30 CH CH2818/81A patent/CH654767A5/de not_active IP Right Cessation
-
1982
- 1982-04-05 US US06/365,166 patent/US4465121A/en not_active Expired - Lifetime
- 1982-04-23 EP EP82103442A patent/EP0064238B1/de not_active Expired
- 1982-04-23 AT AT82103442T patent/ATE25344T1/de not_active IP Right Cessation
- 1982-04-23 DE DE8282103442T patent/DE3275357D1/de not_active Expired
- 1982-04-27 AU AU83040/82A patent/AU548390B2/en not_active Ceased
- 1982-04-28 JP JP57070581A patent/JPS57184565A/ja active Granted
- 1982-04-28 CA CA000401892A patent/CA1186476A/en not_active Expired
- 1982-04-30 ES ES512500A patent/ES8305609A1/es not_active Expired
Also Published As
Publication number | Publication date |
---|---|
CA1186476A (en) | 1985-05-07 |
DE3275357D1 (en) | 1987-03-12 |
AU8304082A (en) | 1982-11-04 |
EP0064238A1 (de) | 1982-11-10 |
ES512500A0 (es) | 1983-04-16 |
JPS57184565A (en) | 1982-11-13 |
ATE25344T1 (de) | 1987-02-15 |
AU548390B2 (en) | 1985-12-12 |
JPH032579B2 (ja) | 1991-01-16 |
CH654767A5 (de) | 1986-03-14 |
US4465121A (en) | 1984-08-14 |
ES8305609A1 (es) | 1983-04-16 |
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