Claims
- 1. A system for manufacturing thin plate comprising:
- thin cast slab plate conveying means for conveying a plurality of thin cast slab plates with a thickness of less than 100 mm adjacent one another in a heated condition,
- a splicer disposed downstream of the thin cast slab plate supply means in the travel path of the cast slab plates and including splicing means for continuously splicing facing ends of adjacent ones of the slab plates together to thereby form a continuous strip of spliced together slab plates,
- and a plurality of hot rolling finishing mill stands for continuous rolling of the continuous strip of spliced together slab plates, at least one of said hot rolling finishing mill stands having only one pair of small diameter working rollers which are driven by respective supporting rollers and are not directly rotatably driven, thereby facilitating high rolling loads at the at least one mill stand with only one pair of small diameter working rollers.
- 2. A system according to claim 1, comprising a front edge press for tapering a front edge port, on of a first slab plate of the continuous strip of slab plates for aiding in engagement of the front edge portion by working rollers of the rolling mill stands.
- 3. A system according to claim 1, comprising:
- a winding-off coiler provided upstream of said splicer,
- a tunnel furnace having functions to take up, transfer and discharge a coil of said cast plate provided upstream of said winding-off coiler;
- a winding-up coiler provided upstream of said tunnel furnace;
- a soaking pit provided upstream of the winding-up coiler;
- at least one continuous casting machine for casting the thin plates provided upstream of said soaking pit; and
- one of a down-coiler and a chain wrapper provided downstream of said plurality of rolling mill stands.
- 4. A system according to claim 1, comprising:
- a heating furnace capable of discharging said thin cast plate provided upstream of said splicer;
- a soaking pit capable of taking up, transferring and discharging said thin cast plate provided upstream of said heating furnace;
- at least one continuous casting machine for casting the thin plate provided upstream of said soaking pit; and
- one of a down coiler and a chain wrapper provided the downstream of said plurality of rolling mill stands.
- 5. A system according to claim 2, wherein said front edge press comprises anvil blocks with a taper portion and a parallel portion.
- 6. A system according to claim 2, wherein said front edge press comprises rotatable upper and lower anvil blocks, an off-set being provided between a line connecting between upper and lower rotating centers of the anvil blocks and the minimum bite gap portion between the upper and the lower anvil blocks.
- 7. A system according to claim 1, wherein said splicer comprises:
- cutting means for cutting a rear edge of a precedent plate and a front edge of a following plate,
- melt-planing means having a plurality of melt-planing torches arranged in a width direction of the plate,
- transferring means for moving said melt-planning torches in the width direction of the plates,
- pressing means for applying pressing force to the interface of the rear edge of the precedent plate and the front edge of the following plate.
- 8. A system according to claim 1, wherein said splicer comprises:
- cutting means for cutting a rear edge of a precedent plate and a front edge of a following plate,
- induction heating coils arranged at the upper and the lower surfaces of said plates to inductively heat butt surfaces of the plates, and
- pressing means for applying pressing force to the interface of said butt surfaces.
- 9. A system according to claim 1, wherein said splicer comprises:
- cutting means for cutting a rear edge of a precedent plate and a front edge of a following plate,
- arc generating means for locally generating arc by conducting current in a gap between butt surfaces of plates,
- arc transferring means for moving said arc generating means in a width direction of the plate, and
- pressing means for applying pressing force to the butt interface of the rear edge of the precedent plate and the front edge of the following plate.
- 10. A system according to claim 1, wherein said splicer comprises:
- cutting means for cutting a rear edge of a precedent plate and a front edge of a following plate,
- oxygen gas jetting means for jetting oxygen gas to at least one edge surface of the rear edge of the precedent plate and the front edge of the following plate,
- iron powder mixing means for mixing iron powder in the oxygen gas, and
- pressing means for applying pressing force to the contacting surfaces of the rear edge of the precedent plate and the front edge of the following plate.
- 11. A system according to claim 1, wherein said splicer comprises:
- cutting means for cutting a rear edge of a precedent plate and a front edge of a following plate,
- plate vibrating means for vibrating at least one of the rear edge of the precedent plate and the front edge of the following plate, and
- pressing means for applying pressing force to the contacting surfaces of the rear edge of the precedent plate and the front edge of the following plate.
- 12. A system according to claim 1, wherein said plurality of rolling mill stands are constructed such that at least a first front rolling mill stand or first and second front rolling mill stands are four-high rolling mill stands.
- 13. A system according to claim 1, wherein said plurality of rolling mill stands are constructed such that at least a first front rolling mill stand or first and second front rolling mill stands have working rollers made of a material for high temperature and the other downstream rolling mill stands have working rollers made of a material for lower temperature, the materials for the working rollers being different from each other at the respective mill stands.
- 14. A system according to claim 1, wherein at least one rolling mill stand among said set of rolling mill stands has working rollers which are movable in the direction of the working roller axes.
- 15. A system according to claim 1, wherein at least one rolling mill stand among said plurality rolling mill stands is a rolling mill stand wherein upper and lower working rollers are crossed in the horizontal plane with respect to each other to vary the gap between the rollers.
- 16. A system according to claim 1, wherein at least one rolling mill stand among said plurality of rolling mill stands is a six-high rolling mill stand that has a working roller bender and intermediate rollers capable of moving in the axial direction.
- 17. A system according to claim 1, comprising:
- a machine for increasing a friction coefficient between a working roller and a plate to be rolled at an engaging condition of the plate with the working roller.
- 18. A system according to claim 17, wherein said machine for increasing friction coefficient is a machine to grind a working roller installed in a rolling mill stand.
- 19. A system according to claim 17, wherein said machine for increasing friction coefficient is a machine for forming projections and depressions on a surface of a front edge of a thin plate.
- 20. A system according to claim 17, wherein said machine for increasing friction coefficient is a machine for supplying friction increaser material between the working roller and a plate to be rolled.
- 21. A system for manufacturing thin plate by hot working according to claim 1, wherein said splicer comprises:
- pressing means for superposing and pressing a rear edge of a precedent plate and a front edge of a following plate;
- sliding means for sliding the rear edge of said precedent plate and the front edge of said following plate superposed and pressed against each other; and
- indent forming means for forming at Least one indent portion on at least one of the superposed surfaces of the rear edge of said precedent plate and the front edge of said following plate.
- 22. A system for manufacturing thin late by hot working according to claim 1, wherein said splicer comprises:
- thinning means for thinning each of a rear edge of a precedent plate and a front edge of a following plate:
- pressing means for superposing and pressing the rear edge of the precedent plate and the front edge of the following plate thinned with said thinning means; and
- sliding means for sliding the rear edge of said precedent plate and the front edge of said following plate superposed and pressed against each other;
- wherein said thinning means has means for forming at least one indent portion on at least one of the superposed surfaces of the rear edge of said precedent plate and the front edge of said following plate.
- 23. A system according to claim 1, wherein said plurality of finishing mill stands includes at most four mill stands.
- 24. A system according to claim 3, wherein said plurality of finishing mill stands includes at most four mill stands.
- 25. A system according to claim 4, wherein said plurality of finishing mill stands includes at most four mill stands.
- 26. A system according to claim 1, wherein said working rollers which are not directly rotatably driven have a diameter less than 600 mm.
- 27. A system according to claim 1, wherein said working rollers which are not directly rotatably driven have a diameter of between 300 and 400 mm.
- 28. A system according to claim 3, wherein said mill stands consist of three four-high mill stands having respective working rollers indirectly driven by respective reinforcing rollers driven by electric motor means.
- 29. A system according to claim 28, wherein said working rollers of each of said stands have a diameter of between 300 and 400 mm.
- 30. A method for manufacturing thin plate comprising:
- conveying a plurality of heated thin cast slab plates with a thickness of less than 100 mm adjacent one another in a heated condition,
- continuously splicing facing ends of adjacent ones of the heated slab plates while conveying same to thereby form a continuous strip of spliced together heated slab plates,
- and hot rolling said continuous strip of heated slab plates at a plurality of serially arranged hot rolling finishing mill stands, at least one of said hot rolling finishing mill stands having only one pair of small working rollers which are driven by respective supporting rollers and are not directly rotatably driven, thereby facilitating high rolling loads at the at least one mill stand with only one pair of small diameter working rollers.
- 31. A method according to claim 30, wherein all of said working rollers of the mill stands are other than directly rotatably driven.
- 32. A method according to claim 30, further comprising:
- tapering the front edge of a first plate of said continuous strip using a front edge press, and introducing the tapered front edge to the first rolling mill stand to initiate engagement of the strip for rolling operation.
- 33. A method according to claim 30, further comprising:
- casting thin plate using at least one continuous casting machines,
- winding up the thin plate to form a coil-shape using a winding-up coiler;
- heating said coil-shaped thin plate in a tunnel furnace;
- winding off the coil-shaped thin plate heated in said tunnel furnace and supplying same to the conveyor.
- 34. A method according to claim 33, comprising winding up said thin plate rolled using one of a down-coiler or a chain wrapper.
- 35. A method according to claim 30, further comprising:
- casting thin plate using at least one continuous casting machine;
- heating said thin plate after casting in a soaking pit;
- transferring said thin plate heated in the soaking pit to a heating furnace to heat the thin plate at a given temperature in said heating furnace;
- and supplying said thin plate to a splicer for said splicing.
- 36. A method according to claim 35, further comprising winding up said thin plate after said rolling using one of a down-coiler and a chain wrapper.
- 37. A method according to claim 32, wherein said tapering comprises using said front edge press having anvil blocks with a taper portion and a parallel portion.
- 38. A method according to claim 32, wherein said tapering comprises using said front edge press having rotatable upper and lower anvil blocks, an off-set being provided a line connecting between upper and lower anvil block rotating centers and the minimum bite gap portion between the upper and the lower anvil blocks.
- 39. A method according to claim 30 wherein said splicing comprises:
- cutting a rear edge of a precedent plate and a front edge of a following plate perpendicular to the rolling direction,
- melt-planing at least one of the rear edge of the precedent plate and the front edge of the following plate in the width direction of the rolled plate by blowing jet flow of melt-planing torches to a portion with a green width from the edge,
- forming a splicing surface on the edge surface by said melt-planning, and
- applying pressing force to the splicing surfaces to splice the thin plates.
- 40. A method according to claim 30, wherein said splicing comprises:
- cutting a rear edge of a precedent thin plate and a front edge of a following thin plate,
- butting the rear edge of the precedent thin plate and the front edge of the following thin plate with a gap between the rear edge of the precedent thin plate and the front edge of the following thin plate,
- inductively heating the butt surfaces of the thin plates by induction heating coils arranged at the upper and the lower surfaces of said thin plate, and
- applying pressing force to the interface of said butt surfaces to splice the rear edge of the precedent thin plate and the front edge of the following thin plate.
- 41. A method according to claim 30, wherein said splicing comprises:
- cutting a rear edge of a precedent thin plate and a front edge of a following thin plate,
- butting the rear edge of the precedent thin plate and the front edge of the following thin plate with a gap between the rear edge of the precedent thin plate and the front edge of the following thin plate,
- conducting direct current in the gap to locally generate arc and concurrently applying alternating magnetic field in the thickness direction of said gap to create magnetic force in the width direction to said arc,
- heat-melting each of the rear edge of the precedent thin plate and the front edge of the following thin plate in the width direction of the thin plates by the arc moving in the width direction of the thin plates, forming a splicing surface in each of the edges, and
- applying pressing force to the interface of said butt surfaces to splice the rear edge of the precedent thin plate and the front edge of the following thin plate.
- 42. A method for according to claim 30, wherein said splicing comprises:
- cutting a rear edge of a precedent thin plate and a front edge of the following thin plate,
- jetting oxygen gas and iron powder, if necessary, to at least one edge surface of the rear edge of the precedent plate and the front edge of the following plate to heat-melt and concurrently to blow off oxidized scales, forming a splicing surface in each of the rear edge of the precedent thin plate and the front edge of the following thin plate, and
- applying pressing force to the splicing surfaces to splice the rear edge of the precedent plate and the front edge of the following plate.
- 43. A method according to claim 30, wherein said splicing comprises:
- cutting a rear edge of a precedent thin plate and a front edge of a following thin plate,
- vibrating at least one edge surface of the rear edge of the precedent plate and the front edge of the following plate to form splicing surfaces, and
- applying pressing force to the splicing surfaces to splice the rear edge of the precedent plate and the front edge of the following plate.
- 44. A method according to claim 30, wherein said rolling said thin plate includes using a set of said rolling mill stands constructed such that at least a first front rolling mill stand or first and second front rolling mill stands are four-high rolling mill stands.
- 45. A method according to claim 30, wherein said rolling said thin plate includes using a set of said rolling mill stands constructed such that at least a first front rolling mill stand or first and second front rolling mill stands have working rollers made of a material for high temperature and the other rolling mill stands have working rollers made of a material for lower temperature, the materials for the working rollers being different from each other.
- 46. A method according to claim 30, wherein said rolling said thin plate includes using a set of rolling mill stands constructed such that at least one rolling mill stand has working rollers adjustably movable in the direction of the roller axis.
- 47. A method according to claim 30, wherein said rolling said thin plate includes using a set of rolling mill stands constructed such that at least one rolling mill stand has upper and lower working rollers crossed in the horizontal plane with respect to each other to vary the gap between the rollers.
- 48. A method according to claim 30, wherein said rolling said thin plate includes using a set of rolling mill stands constructed such that at least one rolling mill stand is a six-high rolling mill stand that has a working roller bender and intermediate rollers capable of moving in the axial direction.
- 49. A method according to claim 30, comprising passing a dummy strip through said set of rolling mills in advance of rolling a first thin plate, splicing said dummy strip and said thin plate strip, and rolling said thin plate.
- 50. A method according to claim 30, comprising cutting out said dummy strip after said rolling.
- 51. A method according to claim 30, comprising passing a first end of said thin plate strip through said set of rolling mills under a light pressure rolling condition when the thin plate is rolled in the first place, then rolling the thin plate under a given higher rolling pressure.
- 52. A method according to claim 51, comprising performing rolling by a rolling schedule in which a thick plate is rolled in the first place.
- 53. A method according to claim 30, comprising engaging an upstream end of the plate strip in a state of increasing friction coefficient between the roller and said plate strip prior to said rolling.
- 54. A method according to claim 30, wherein said splicing comprises:
- superposing and pressing the rear edge of the precedent plate and the front edge of the following plate;
- a second process for sliding the rear edge of said precedent plate and the front edge of said following plate superposed and pressed against each other; and
- a third process for forming at least one indent portion on at least one of the superposed surfaces of the rear edge of said precedent plate and the front edge of said following plate.
- 55. A method according to claim 30, wherein said splicing comprises:
- a process for thinning each of the rear edge of the precedent plate and the front edge of the following plate;
- a process for superposing and pressing the rear edge of the precedent plate and the front edge of the following plate;
- a process for sliding the rear edge of said precedent plate and the front edge of said following plate superposed and pressed against each other; and
- a process for forming at least one indent portion on at least one of the superposed surfaces of the rear edged of said precedent plate and the front edge of said following plate.
- 56. A method according to claim 30, wherein:
- in rolling a first plate to be rolled using said set of rolling mill stands, forming projections and depressions on the surface of the front edge of only said first plate using means for forming at least one indent portion on the front edge of the first plate; then rolling the first plate using the set of rolling mill stands having non-driving small diameter working rollers; and
- in rolling the plates following the first plate using said set of rolling mill stands, continuously splicing the rear edge of a precedent plate to the front edge of the following plate, then rolling the plate using the set of rolling mill stand having non-driven small diameter working rollers.
- 57. A method according to claim 30, wherein:
- in rolling a first plate to be rolled using said set of rolling mill stands, thinning the front edge of said first plate using thinning means for thinning only the front edge of the first plate; then rolling the first plate using the set of rolling mill stands having non-driven small diameter working rollers; and
- in rolling the plates following the first plate using said set of rolling mill stands, continuously splicing the rear edge of a precedent plate to the front edge of the following plate, then rolling the plate using the set of rolling mill stands having non-driven small diameter working rollers.
- 58. A method according to claim 30, wherein said plurality of finishing mill stands includes at most four mill stands.
- 59. A method according to claim 33, wherein said plurality of finishing mill stands includes at most four mill stands.
- 60. A method according to claim 35, wherein said plurality of finishing mill stands includes at most four mill stands.
- 61. A method for manufacturing thin plate comprising:
- conveying a plurality of thin cast slab plates with a thickness of less than 100 mm adjacent one another in a heated condition,
- continuously splicing facing ends of adjacent ones of the slab plates while conveying same to thereby form a continuous strip of spliced together slab plates,
- and hot rolling said continuous strip of slab plates at a plurality of serially arranged hot rolling finishing mill stands, at least some of said hot rolling finishing mill stands having working rollers which are not directly rotatably driven,
- wherein said working rollers which are not directly driven have a diameter of between 300 and 400 mm.
- 62. A method according to claim 31, wherein said working rollers have a diameter of between 300 and 400 mm.
- 63. A method according to claim 33, wherein said mill stands consist of three four-high mill stands having respective working rollers indirectly driven by respective reinforcing rollers driven by electric motor means.
- 64. A system according to claim 1, wherein a plurality of said hot rolling mill stands have only one pair of small diameter working rollers which are driven by respective backup rollers and are not directly rotatably driven.
- 65. A method according to claim 30, wherein a plurality of said hot rolling mill stands have only one pair of small diameter working rollers which are driven by respective backup rollers and are not directly rotatably driven.
- 66. A system for manufacturing thin plate comprising:
- a thin cast heated slab plate conveyor,
- a splicer disposed downstream of said thin cast heated slab plate conveyor in the travel path of the cast slab plates which in use continuously splice the spacing ends of adjacent ones of the slab plates together to thereby form a continuous strip of spliced together slab plates, and
- a plurality of hot rolling finishing mill stands disposed downstream of the splicer to continuously roll the continuous strip of spliced together slab plates, at least one of said plurality of hot rolling finishing mill stands having only one pair of small diameter working rollers and respective backup rollers backing up and rotatably driving said working rollers.
- 67. A system according to claim 66, wherein said conveyor conveys thin cast slab plates having a thickness of less than 100 mm.
- 68. A system according to claim 66, wherein a plurality of said hot rolling mill stands have only one pair of small diameter working rollers which are driven by respective backup rollers and are not directly rotatably driven.
- 69. A method of manufacturing thin plate comprising:
- conveying a plurality of thin cast slab plates adjacent one another in a heated condition, said plurality of thin cast slab plates each having a thickness of less than 100 mm,
- continuously splicing facing ends of adjacent ones of the conveyed heated slab plates together to thereby form a continuous strip of spliced together slab plates, and
- continuously rolling the continuous strip of spliced together slab plates in a plurality of hot rolling finishing mill stands, at least one of said plurality of hot rolling finishing mill stands having only one pair of small diameter working rollers, said rolling including indirect rotating drive of said small diameter working rollers by way of backup rollers engaging said small diameter working rollers.
- 70. A method according to claim 69, wherein a plurality of said hot rolling mill stands have only one pair of small diameter working rollers which are driven by respective backup rollers and are not directly rotatably driven.
- 71. A system according to claim 1, wherein said at least one of said hot rolling finishing mill stands is a four high rolling mill stand and said supporting rollers are backup rollers.
- 72. A system according to claim 1, wherein said at least one of said hot rolling finishing mill stands is a six high rolling mill stand and said supporting rollers are intermediate rollers.
- 73. A method according to claim 30, wherein said at least one of said hot rolling finishing mill stands is a four high rolling mill stand and said supporting rollers are backup rollers.
- 74. A method according to claim 30, wherein said at least one of said hot rolling finishing mill stands is a six high rolling mill stand and said supporting rollers are intermediate rollers.
Priority Claims (1)
Number |
Date |
Country |
Kind |
6-048250 |
Mar 1994 |
JPX |
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Parent Case Info
This is a continuation-in-part application of application Ser. No. 08/203,314 filed Mar. 1, 1994.
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Continuation in Parts (1)
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Number |
Date |
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Parent |
203314 |
Mar 1994 |
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