WO1997000748A1 - Method of continuously casting thin cast pieces - Google Patents
Method of continuously casting thin cast pieces Download PDFInfo
- Publication number
- WO1997000748A1 WO1997000748A1 PCT/JP1996/001701 JP9601701W WO9700748A1 WO 1997000748 A1 WO1997000748 A1 WO 1997000748A1 JP 9601701 W JP9601701 W JP 9601701W WO 9700748 A1 WO9700748 A1 WO 9700748A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rolling
- piece
- unsolidified
- thickness
- speed
- Prior art date
Links
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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
-
- 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
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
Definitions
- the present invention makes it possible to change the thickness of a thin piece by continuously releasing the rolling force during the unsolidification reduction, in particular, in a continuous manufacturing method in which the thin piece is subjected to a non-solidification reduction, thereby preventing internal defects.
- the present invention relates to a method for continuously manufacturing thin pieces.
- the hot-rolling direct-coupling process using such thin flakes is advantageous in that steps such as rough rolling can be omitted, so that energy saving and work rationalization of the entire iron making process can be realized more effectively. It is.
- the thickness of the die was made equal to that of the conventional type.
- a method for producing a thin piece by reducing unsolidified piece has been proposed. This is the so-called uncoagulation reduction method.
- the thickness of the piece can be controlled to be variable during the production according to the steel type, production volume, coil thickness in the post-process, etc. Rather, it is also required to have an operation mode in which the rolling force is released at the time of unsolidification rolling to return to the original piece thickness or another piece thickness to continue the continuous structure. Only On the other hand, in such a case, an area where the thickness of one piece shifts to the next piece thickness. In other words, the existence of an unsteady portion is inevitable.
- the thickness of the refractory nozzle must be reduced as compared with the conventional type, so that the nozzle breakage due to the refractory material melting easily occurs. Because of this, the nozzle life is short, and ⁇ is a conventional one? Up to 8 trains. 3 trains are the limit. Therefore, it is a major issue from the viewpoint of improving the yield, how to reduce the above-mentioned unsteady part by the limited number of ⁇ .
- an object of the present invention is to make it possible to change the thickness of a thin piece by releasing the middle rolling force while preventing the internal defect of the piece in the unsolidified rolling continuous manufacturing method of a thin piece.
- An object of the present invention is to provide a continuous manufacturing method of a thin piece.
- Another object of the present invention is to provide a method for continuously producing thin pieces under an unsolidified pressure while preventing internal defects of the pieces and minimizing the length of the non-stationary part while producing the thin pieces.
- An object of the present invention is to provide a continuous manufacturing method of a thin piece that can change a piece thickness by releasing a rolling force.
- the operation of releasing the rolling force of the reduction roll is called the opening operation.
- the starting point of the opening operation is the time when the change point of the piece has passed the final reduction roll, and then the releasing force is released.
- the thickness is returned to the required thickness.
- the solidification tip (the position where the piece is completely solidified) is always in the unsolidified rolling zone. It was noted that bulging and other problems did not occur under the same cooling conditions if they were within the range.
- the thin piece completely solidifies in the unsolidified rolling reduction zone (2). Under the cooling condition, while moving the solidification tip to the upstream side from the end position of the rolling zone, the rolling force at the time of unsolidified rolling was released during that time,
- the manufacturing speed is increased to a steady value of the target piece thickness.
- the thickness of the piece can be changed without any internal defects in the piece, and the present invention has been completed.
- the present invention is, in a broad sense, an unsolidified rolling continuous manufacturing method for manufacturing a thin piece by rolling down a piece being manufactured having an unsolidified layer in a reduction zone, for example, controlling a manufacturing speed.
- the coagulation tip is moved to the upstream side from the end position of the rolling zone, and the rolling force at the time of unsolidified rolling is released during that time, and the thickness of the piece at that time is returned to the target piece thickness.
- the present invention provides a method for producing a thin piece by rolling down a piece having a non-solidified layer in a rolling zone in a rolling zone. An unsolidified rolling continuous manufacturing method in which the manufacturing speed is changed.
- the target thickness of the flakes is completely solidified in the unsolidified rolling zone after the change. Move the tip to the end of the rolling zone. While Kitaichi has upstream, at the same time, or even during changes ⁇ speed properly is opens the rolling force after change end, ⁇ thickness at that time is the target ⁇ t
- the change of the production speed is started at the same time as or before the end point of the non-solidification rolling zone passes the change point of the piece.
- FIG. 1 is a side longitudinal sectional view showing a configuration example of a continuous machine for carrying out the method of the present invention.
- FIG. 2 is an explanatory diagram showing an example of a change in the piece thickness and the manufacturing speed when the piece thickness is changed according to the method of the present invention.
- FIG. 3 is an explanatory diagram similar to FIG. 2 showing a piece thickness changing operation in a comparative example.
- FIG. 4 is a longitudinal side view showing a piece shape in a transition period of the release of the rolling force according to the method of the present invention.
- FIG. 5 is a longitudinal side view showing a half-piece shape in a transition period of the release of the rolling force of the comparative example.
- FIG. 6 is a longitudinal cross-sectional view of the inside of a piece in a comparative example during a rolling force release transition period.
- FIG. 7 is a graph showing the results of the example.
- FIG. 1 is a schematic explanatory view showing a basic configuration of a continuous machine (hereinafter, referred to as a machine) that is desirable for carrying out the method of the present invention.
- the machine is provided with a ⁇ type 1, a roller apron band 2 and a pinch roll band 3.
- the machine type can be any of the usual curved type and VB type.
- Roller-apron belt 2 is composed of four rolls, some of which are drive rolls 4 '.
- a plurality of rolls 4 and / or drive rolls 4 * provided with a roll-down cylinder 15 for rolling down the unsolidified strip 11 into a thin strip 12 are provided in the mouth apron belt 2.
- An unsolidified rolling reduction zone 7 composed of segments (seg) 6 is provided.
- the unsolidified rolling zone 7 in the roller-apron zone 2 is composed of a total of about 5 segments as shown in the figure, and is located between the meniscus 10 of the molten steel 9 in the mold 1 and the length of about 6 m. Good to do.
- the pinch roll band 3 is a normal one including eight groups of pinch rolls provided downstream of the roller-apron band 2.
- the size of mold 1 is about 90 to 150 mm in thickness and about 1000 to 1800 mm in width. This Is set to a target thickness of about 30 to 70 bandages under unsolidification pressure. Therefore, it is desirable that the unsolidified rolling pattern in the above-mentioned machine has a rolling reduction of about 5 to 35 mm per segment.
- a desirable range of the steady-state production speed is about 3.0 to 5.0 m / min.
- the cooling conditions are adjusted so that such a production speed can be secured. Since these differ depending on the thickness of the piece, they may be simply referred to as a predetermined manufacturing speed in the following.
- the rolling force was released during the production due to the relationship between the steel type composition and the production speed.For example, the original thickness was returned from 50 mm in thickness to 100 dragon and the production was continued. May need to be done.
- the release of the rolling force is not performed immediately after the change point of the piece has passed through the reduction zone, but the manufacturing speed is reduced to the speed at which the thin piece after the reduction is completely solidified in the unsolidified reduction zone.
- FIG. 2 is an explanatory diagram showing an example of changes in the piece thickness and the manufacturing speed when changing the piece thickness according to the method of the present invention.
- -b In this example, let us consider a case where unsolidification rolling is performed from 100 mm thickness to 50 state in the steady state, and this is returned to 100 mm thickness again. The production speed is changed at the same time as the rolling release, that is, when the change point of the piece has passed the end point of the rolling zone.
- the production is started at a piece thickness of 100 mm and a steady production speed of 4.0 m / min, and the unsolidified pressure is reduced to 50 iMi by the unsolidified pressure during operation.
- the change at this time starts when the change point of the piece passes the end point of the unsolidified rolling reduction zone, immediately reduces the manufacturing speed continuously to 2.0 m / min, and simultaneously reduces the rolling force continuously.
- the target production speed at this time is equal to or less than the target thickness, in this case, the production speed at which the thin piece having a thickness of 100 mm completely solidifies in the rolling zone. Therefore, the manufacturing speed at this time varies depending on the desired thickness of the piece. In other words, the solidification tip fluctuates as the production speed decreases and the rolling release is released.
- the speed is not particularly limited.
- the degree of reduction in the manufacturing speed at this time is not particularly limited, but it is preferable to reduce the speed as quickly as the machine's capability allows in order to minimize the occurrence of unsteady state.
- the length a indicates the time required for this deceleration.
- the manufacturing is continued at that manufacturing speed. During this time, the release of the rolling force is continued, and after the target rolling force is released, that is, after the target piece thickness is secured, the production speed starts to return to the steady speed.
- the length b up to this point indicates the time it takes for the solidification tip, which has moved upstream from the end point of the reduction zone, to return to the end point of the reduction zone.
- the solidification tip that has shifted to the upstream side due to the reduction of the manufacturing speed continues to gradually shift to the downstream side as the thickness of the piece increases, and after a lapse of time b, the solidification tip returns to the end position of the rolling zone. After that, the cooling speed is adjusted to increase the manufacturing speed while maintaining the solidification tip at that position.
- the solidification tip may be located upstream of the rolling zone end position even after the elapse of the time b, and may return to the rolling zone end position by increasing the production speed.
- the length a + b in Fig. 2 corresponds to the length of the unsteady part.
- the length a (or b) is made as small as possible.
- the change of the manufacturing speed is started before the change point of the piece passes through the end point of the reduction zone.
- the mode at this time will be described as follows.
- the point at which the manufacturing speed is changed is set based on the point at which the change point of the piece passes through the end point of the rolling zone.
- the production speed for complete solidification at the end of the rolling zone 2. Om / min.
- the point in time when 100 bandages are required as a steady piece thickness is first determined based on the end position of the reduction zone.
- the thin piece when changing the piece, first, the thin piece is changed from the steady manufacturing speed to the manufacturing speed at which the thin piece completely solidifies in the unsolidified reduction zone, and the manufacturing speed at that time is, for example, Assuming that the target piece thickness is lOOmmm and the distance from the molten steel meniscus in the mold to the end of the unsolidified rolling reduction zone is 6m, the forming speed until the solidified shell thickness at that position becomes 50mm
- the desirable range of the production speed for complete solidification in this way depends on the thickness of the mold and the length of the unsolidified rolling zone, but is generally about 1.0 to 2.0 m / min.
- the degree of change when changing the ⁇ speed i.e., the range of speed reduction ratio or speed increasing ratio is 1. 0 ⁇ 4. 0 m / min 2 about as to the desired arbitrary.
- medium-carbon aluminum-killed steel with the composition shown in Table 1 was produced at a steady-state production speed of 5.0 m / min.
- the size of the mold is 100 mm thick and 1500 mm wide.
- the uncoagulating rolling operation is performed to reduce the uncoagulated pressure down to the target thin piece size of 50 thighs and width of 1500 mm. I recovered. ⁇ ⁇ ⁇
- the forging speed was 1.3 m / min, which completely solidified by the end of the reduction zone.
- a piece having an unsolidified layer is rolled down during fabrication in the machine to be rolled to a thickness of 50 mm, and the rolling zone in the machine is the first segment of the roller apron belt. It was set at a distance of 3 m from the first segment to the fifth segment, and the end position of the rolling zone was 4 m from the molten steel meniscus in the ⁇ type.
- the rolling pattern was a uniform 10 mm rolling for each segment.
- FIG. 3 is a view showing a change in the manufacturing speed and a change in the piece thickness of this comparative example with respect to the manufacturing time. From this, it can be seen that the thickness of the piece at the end of the reduction zone, that is, the release rolls are continuously opened.
- the piece in the transitional period had a bulging shape due to bulging as shown in FIG.
- the transition of the thickness of the piece was smoothly performed, and there was no internal cracking or center segregation in the unsteady part, and it was good.
- Fig. 7 shows the comparison of the internal quality in this example.
- the internal quality code on the vertical axis is graded according to the following criteria.
- Endoplasmic Code 0 horizontal cross-sectional area of 10 cm 2 per one porosity area ratio 0%
- the effect of the production speed was evaluated.
- the medium-carbon aluminum-killed steel shown in Table 1 was produced at a steady production speed of 5.
- the target recovery thickness from a piece thickness of 50 mm was set to 100, but the forging speed at the beginning was varied and the forging speeds were set to 1.3, 2.0, and 3.0 m / min.
- the production speed at which the pieces were completely solidified by the end of the reduction zone was 1.3 m / min.
- the piece thickness sequentially changed from 100 to 50 to 100 mm. ⁇ The inside of the piece was good without internal cracking and deterioration of central prayer.
- the thickness of the solidified seal was 40 mm and 33 mm, respectively, at the end of the rolling zone.
- the irregular part changed to a drum shape as shown in Fig. 5.
- the internal quality was 2.0 or 3.0 m / min when the structure was opened, internal cracking occurred, center segregation deteriorated, and porosity increased, leading to a decrease in yield.
- the method of the present invention it is possible to continuously change the thickness of a piece even during a continuous production operation, and at this time, it is possible to prevent a decrease in surface texture and internal quality. Pieces can be manufactured efficiently.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Metal Rolling (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9503726A JP2961893B2 (en) | 1995-06-22 | 1996-06-20 | Continuous casting of thin slabs |
EP96918856A EP0776716A4 (en) | 1995-06-22 | 1996-06-20 | Method of continuously casting thin cast pieces |
KR1019970700984A KR100227594B1 (en) | 1995-06-22 | 1996-06-20 | Method of continuous casting thin cast pieces |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15639495 | 1995-06-22 | ||
JP7/156394 | 1995-06-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997000748A1 true WO1997000748A1 (en) | 1997-01-09 |
Family
ID=15626785
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1996/001701 WO1997000748A1 (en) | 1995-06-22 | 1996-06-20 | Method of continuously casting thin cast pieces |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0776716A4 (en) |
KR (1) | KR100227594B1 (en) |
CN (1) | CN1048203C (en) |
WO (1) | WO1997000748A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001047206A (en) * | 1999-07-17 | 2001-02-20 | Sms Schloeman Siemag Ag | Method and device for changing material thickness in specification of casting continued body in continuous casting equipment with continuous casting operation |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100518327B1 (en) * | 2002-12-23 | 2005-10-04 | 주식회사 포스코 | A Method of Startup Procedure of Strip in the Twin Roll Strip Casting Process |
CN103192043B (en) * | 2013-04-07 | 2016-01-20 | 昆明理工大学 | A kind of method suppressing ingot casting centre burst to produce |
CA2947828C (en) * | 2014-05-14 | 2019-01-15 | Nippon Steel & Sumitomo Metal Corporation | Method for continuous-casting slab |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53102224A (en) * | 1977-02-18 | 1978-09-06 | Ishikawajima Harima Heavy Ind | Drawing off method and apparatus for continuous casted segment |
JPS5422777B2 (en) * | 1973-09-17 | 1979-08-09 | ||
JPS5813454A (en) * | 1981-07-13 | 1983-01-25 | Nippon Steel Corp | Method and device for controlling thickness of ingot in continuous casting |
JPH01271047A (en) * | 1988-04-20 | 1989-10-30 | Sumitomo Metal Ind Ltd | Light rolling reduction method in continuous casting machine |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5110533A (en) * | 1990-11-07 | 1992-05-05 | Milad Limited Partnership | Method for the use of gas assistance in the molding of plastic articles to enhance surface quality |
AT401744B (en) * | 1993-10-14 | 1996-11-25 | Voest Alpine Ind Anlagen | METHOD AND SYSTEM FOR CONTINUOUS CASTING |
-
1996
- 1996-06-20 EP EP96918856A patent/EP0776716A4/en not_active Withdrawn
- 1996-06-20 WO PCT/JP1996/001701 patent/WO1997000748A1/en not_active Application Discontinuation
- 1996-06-20 CN CN96190674A patent/CN1048203C/en not_active Expired - Lifetime
- 1996-06-20 KR KR1019970700984A patent/KR100227594B1/en not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5422777B2 (en) * | 1973-09-17 | 1979-08-09 | ||
JPS53102224A (en) * | 1977-02-18 | 1978-09-06 | Ishikawajima Harima Heavy Ind | Drawing off method and apparatus for continuous casted segment |
JPS5813454A (en) * | 1981-07-13 | 1983-01-25 | Nippon Steel Corp | Method and device for controlling thickness of ingot in continuous casting |
JPH01271047A (en) * | 1988-04-20 | 1989-10-30 | Sumitomo Metal Ind Ltd | Light rolling reduction method in continuous casting machine |
Non-Patent Citations (1)
Title |
---|
See also references of EP0776716A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001047206A (en) * | 1999-07-17 | 2001-02-20 | Sms Schloeman Siemag Ag | Method and device for changing material thickness in specification of casting continued body in continuous casting equipment with continuous casting operation |
Also Published As
Publication number | Publication date |
---|---|
EP0776716A1 (en) | 1997-06-04 |
CN1156980A (en) | 1997-08-13 |
EP0776716A4 (en) | 1999-06-30 |
KR970704535A (en) | 1997-09-06 |
KR100227594B1 (en) | 1999-11-01 |
CN1048203C (en) | 2000-01-12 |
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