WO1993024664A1 - Equipment for continuously annealing steel strips - Google Patents
Equipment for continuously annealing steel strips Download PDFInfo
- Publication number
- WO1993024664A1 WO1993024664A1 PCT/JP1993/000633 JP9300633W WO9324664A1 WO 1993024664 A1 WO1993024664 A1 WO 1993024664A1 JP 9300633 W JP9300633 W JP 9300633W WO 9324664 A1 WO9324664 A1 WO 9324664A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- roll
- steel strip
- rolls
- furnace
- bridle
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
- C21D9/563—Rolls; Drums; Roll arrangements
Definitions
- the present invention relates to a continuous annealing facility for a steel strip after cold rolling.
- the steel strip refers to a steel strip that is subjected to tin plating, zinc plating, etc. as necessary after continuous annealing, and is finally supplied to the production of cans, steel furniture, automobiles, and the like.
- the tension of the steel strip in the furnace of the continuous annealing equipment is preferably as large as possible for the purpose of preventing walk and flash ringing, while the tension is preferably as small as possible for the purpose of preventing heat backlash.
- the tension of the steel strip is reduced in a heating furnace or soaking furnace where the temperature of the steel strip is high in normal operation, and in a cooling furnace where the temperature of the steel strip is relatively low, in an overageing furnace, The tension is being increased.
- Such a tension distribution can be obtained by finely adjusting the Z-control of the speed of the hearth roll, but if it is desired to change the tension abruptly at a certain point in the furnace, a bridle roll is placed in the furnace. It is common to provide one.
- Fig. 1 is a drawing showing an example of this.
- the hearth provided in each furnace is designed to guide the steel strip 1 supplied into each furnace from the inlet side to the outlet side.
- a roll group consisting of rolls 3, a heating furnace 4, and a bridle roll 2 are provided just before the steel strip 1 that has passed through the soaking furnace 5 enters a quench furnace 6 exposed to a high-speed gas jet.
- the tension of the steel strip 1 becomes large after passing through the bridle opening 2 and passes through the subsequent quenching furnace 6, overaging furnace 7, and final cooling furnace 8.
- the bridle opening 2 and the hearth roll 3 provided for such a purpose, of course, must surely restrain the steel strip 1 and cause no slip. Absent. However, in reality, it has been found that the bridle opening 2 and the hearth roll 3 often slip, especially when the steel strip becomes thin, and do not perform their original functions.
- the present invention solves such a problem, and provides a continuous annealing facility for a steel strip in which the functions of a bridle roll and a heart roll are sufficiently exhibited to stably operate an annealing furnace. Disclosure of the invention
- the present invention employs the equipment described in the following (1) to (5).
- a roll with a diameter D such that the surface pressure P expressed by (I) is 10 kPa (kilopascal) or more Continuous annealing equipment for steel strip with p h ( ⁇ 1 + ⁇ 2) D (I) (2)
- T 2 T 1 ⁇ exp ((I)
- the tension magnification T 2 / T 1 is uniquely determined by the parameter ⁇ 0 and is not related to the absolute value of the tension.
- the slip tends to occur when the absolute value of the tension becomes small, that is, the friction coefficient is considered to be affected by the tension.
- bridle rolls There is no limitation on the number of bridle rolls, and the number of bridle rolls may be one.
- the bridle roll and the hoop roll are in a state where the steel strip is normally restrained. In order for the bridle roll and hearth roll to function properly, their diameter must be determined so that this surface pressure is equal to or greater than pc.
- the purpose of the hearth roll is to transport the steel strip without changing its tension.
- the present inventor has found that at a surface pressure of 10 kPa or less, a kinetic friction state occurs and slippage occurs due to a slight difference in tension between around Haas ⁇ -rule.
- the phenomenon of slipping with little difference in tension is strange, but since the control device of the motor that drives the hearth roll has no means for knowing the true speed of the steel strip, the roll speed must be reduced. This phenomenon occurs because control is performed to the command value (same as the bridle roll peripheral speed).
- the roll peripheral speed does not follow the command because the diameter of the hearth roll that has thermally expanded in a high-temperature furnace is not known accurately, which contributes to this phenomenon.
- the presence of such slippage causes flaws in the steel strip, or permanent slipping, which causes the building door to adhere to the surface of the hearth roll (iron warp-like fixation, which also causes flaws in the steel strip).
- This problem can be solved by selecting an appropriate roll diameter so that
- FIG. 1 is a schematic side view showing an example of the arrangement of the in-furnace bridle rolls and hearth holes to which the present invention is applied.
- Figure 2 is a drawing that generally describes the relationship between the winding angle of the steel strip around the bridle roll and the tension.
- FIG. 3 is a drawing showing actually measured values obtained by determining the relationship between the surface pressure of a bridle roll and a hearth roll, which are basic data of the present invention, and the friction coefficient.
- each roll has a different diameter, which is troublesome in both production and maintenance. Therefore, all roll diameters should be less than 390 mm in view of the safe side.
- the critical surface pressure pc determined from Fig. 3 may change, but the bridle roll diameter or the hearth roll diameter is limited. The basic idea of setting the pressure to be higher than the pressure remains unchanged.
- the idea of selecting the unit diameter so that the surface pressure P is at a limit value that does not cause slip is based on the bridging roll as described above. Not only can it be applied to all hearth rolls. If the diameter of the hearth opening cannot be reduced due to dimensional restrictions on the equipment, such as a heating furnace equipped with a radial tube, excessive driving force exceeding the torque required to transport the steel strip to the hearth roll.
- the control system of the hearth roll so as not to add the noise. For example, limit the speed command that is common to the furnace so that the speed error does not exceed a certain value (several mpm). Also, giving proper drooping characteristics is an important technical finding suggested by the present invention. Industrial applicability
- the bridging roll and the hearth roll provided in the continuous annealing furnace can surely exert the function of amplifying the tension of the steel strip, which is its original function. It is possible to achieve a high level of stable operation of the continuous annealing furnace for steel strip. Also, serious defects such as flaws caused by slip between the steel strip and the roll can be prevented.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP93910337A EP0613958B1 (en) | 1992-05-25 | 1993-05-13 | Process for continuously annealing steel strip |
JP50038594A JP3203581B2 (en) | 1992-05-25 | 1993-05-13 | Continuous annealing equipment for steel strip |
DE69329272T DE69329272T2 (en) | 1992-05-25 | 1993-05-13 | Process for the continuous annealing of steel strip |
KR1019930703730A KR960006583B1 (en) | 1992-05-25 | 1993-05-13 | Equipment for continuously annealing steel strips |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15624392 | 1992-05-25 | ||
JP4/156243 | 1992-05-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1993024664A1 true WO1993024664A1 (en) | 1993-12-09 |
Family
ID=15623509
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1993/000633 WO1993024664A1 (en) | 1992-05-25 | 1993-05-13 | Equipment for continuously annealing steel strips |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0613958B1 (en) |
JP (1) | JP3203581B2 (en) |
KR (1) | KR960006583B1 (en) |
CN (1) | CN1028880C (en) |
DE (1) | DE69329272T2 (en) |
WO (1) | WO1993024664A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006077301A (en) * | 2004-09-10 | 2006-03-23 | Nippon Steel Corp | Method for restraining fluttering of steel sheet |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5310968B1 (en) | 2011-09-30 | 2013-10-09 | 新日鐵住金株式会社 | High-strength hot-dip galvanized steel sheet and manufacturing method thereof |
KR101654158B1 (en) * | 2013-07-15 | 2016-09-09 | 주식회사 포스코 | Apparatus for heating slow cooling section in continuous annealing furnace |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5665942A (en) * | 1979-10-31 | 1981-06-04 | Kawasaki Steel Corp | Continuous annealing furnace for hoop |
JPS56163224A (en) * | 1980-05-16 | 1981-12-15 | Nippon Steel Corp | Tension controller for metalllic strip |
JPS5943979B2 (en) * | 1979-10-31 | 1984-10-25 | 川崎製鉄株式会社 | Furnace tension control method |
JPH03173721A (en) * | 1989-11-30 | 1991-07-29 | Toshiba Corp | Device for controlling strip tension in continuous heat treatment furnace |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3806376A (en) * | 1969-12-30 | 1974-04-23 | Nippon Steel Corp | Method for producing low-carbon cold rolled steel sheet having excellent cold working properties and an apparatus for continuous treatment thereof |
US4296919A (en) * | 1980-08-13 | 1981-10-27 | Nippon Steel Corporation | Apparatus for continuously producing a high strength dual-phase steel strip or sheet |
-
1993
- 1993-05-13 JP JP50038594A patent/JP3203581B2/en not_active Expired - Lifetime
- 1993-05-13 KR KR1019930703730A patent/KR960006583B1/en not_active IP Right Cessation
- 1993-05-13 WO PCT/JP1993/000633 patent/WO1993024664A1/en active IP Right Grant
- 1993-05-13 EP EP93910337A patent/EP0613958B1/en not_active Expired - Lifetime
- 1993-05-13 DE DE69329272T patent/DE69329272T2/en not_active Expired - Lifetime
- 1993-05-24 CN CN93106243A patent/CN1028880C/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5665942A (en) * | 1979-10-31 | 1981-06-04 | Kawasaki Steel Corp | Continuous annealing furnace for hoop |
JPS5943979B2 (en) * | 1979-10-31 | 1984-10-25 | 川崎製鉄株式会社 | Furnace tension control method |
JPS56163224A (en) * | 1980-05-16 | 1981-12-15 | Nippon Steel Corp | Tension controller for metalllic strip |
JPH03173721A (en) * | 1989-11-30 | 1991-07-29 | Toshiba Corp | Device for controlling strip tension in continuous heat treatment furnace |
Non-Patent Citations (1)
Title |
---|
See also references of EP0613958A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006077301A (en) * | 2004-09-10 | 2006-03-23 | Nippon Steel Corp | Method for restraining fluttering of steel sheet |
JP4495553B2 (en) * | 2004-09-10 | 2010-07-07 | 新日本製鐵株式会社 | Steel sheet fluttering suppression method |
Also Published As
Publication number | Publication date |
---|---|
JP3203581B2 (en) | 2001-08-27 |
CN1028880C (en) | 1995-06-14 |
DE69329272T2 (en) | 2001-02-08 |
KR960006583B1 (en) | 1996-05-20 |
EP0613958A1 (en) | 1994-09-07 |
CN1080661A (en) | 1994-01-12 |
KR940701456A (en) | 1994-05-28 |
DE69329272D1 (en) | 2000-09-28 |
EP0613958A4 (en) | 1996-10-23 |
EP0613958B1 (en) | 2000-08-23 |
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