EP1428587A1 - System and method for delivering the hot rolled products of hot rolling mills to a cooling bed - Google Patents
System and method for delivering the hot rolled products of hot rolling mills to a cooling bed Download PDFInfo
- Publication number
- EP1428587A1 EP1428587A1 EP03026500A EP03026500A EP1428587A1 EP 1428587 A1 EP1428587 A1 EP 1428587A1 EP 03026500 A EP03026500 A EP 03026500A EP 03026500 A EP03026500 A EP 03026500A EP 1428587 A1 EP1428587 A1 EP 1428587A1
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- European Patent Office
- Prior art keywords
- bar
- bar segments
- paths
- cooling
- delivery
- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
- B21B43/003—Transfer to bed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
- B21B43/12—Devices for positioning workpieces "flushed", i.e. with all their axial ends arranged in line on cooling beds or on co-operating conveyors, e.g. before cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/006—Pinch roll sets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
- B21B39/08—Braking or tensioning arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
- B21B39/18—Switches for directing work in metal-rolling mills or trains
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
Definitions
- This invention relates generally to continuous hot rolling bar mills, and is concerned in particular with a system and method for delivering the hot rolled products of such mills to a cooling bed.
- hot rolled bar products exit the last mill stand, and are subjected to cooling by being passed through one or more water boxes.
- the bar products are then subdivided into bar segments by a dividing shear, which includes a switching mechanism for alternately directing the bar segments to one or the other of two downstream delivery paths leading to the cooling bed.
- Pinch roll units, friction pads, or the like serve to decelerate the bar segments traveling along the delivery paths, with the result that the bar segments gradually slide to a halt before being laterally transferred onto the cooling bed.
- Relatively high tonnage rates can be achieved with this type or arrangement when the mill is rolling larger product sizes, e.g., those having diameters above about 10.0 to 12.0 mm. These larger products have enough column strength to resist buckling as they are being pushed through the water boxes at relatively high mill delivery speeds on the order of 10 to 30 m/sec.
- a single strand mill rolling 8.0 mm rod for delivery to a laying head can operate at a delivery speed of 60 m/sec or greater, yielding a capacity of 85 tons/hour.
- a similar mill rolling 8.0 mm bar for delivery to a cooling bed must necessarily roll at a significantly reduced delivery speed of about 32 m/sec with a reduction in capacity to about 45 tons/hour.
- the reduced delivery speed for bar products is due in large part to the inability of conventional bar handling systems to bring faster moving products to a halt before they are transferred laterally onto the cooling bed.
- An objective of the present invention is to increase the tonnage rate at which mills are able to roll bar products, in particular smaller product sizes, e.g., those having diameters smaller than about 12.0 mm.
- a companion objective of the present invention is to raise the speed at which the smaller bar products are delivered from the mill, and to then decelerate such bar products before they are cooled in the water boxes prior to being delivered to the cooling bed.
- hot rolled bar products are subdivided by a dividing shear into bar segments, and the bar segments are alternately directed to one or the other of two downstream intermediate paths.
- a switch on each intermediate path then alternately directs the bar segments to one or the other of two downstream delivery paths leading to the cooling bed.
- the bar segments traveling along the four delivery paths are subjected to at least two deceleration stages.
- the first deceleration stage operates to slow the bar segments to an intermediate speed lower than the speed at which the bar products are delivered from the mill, and the second deceleration stage operates to further slow the bar segments to a lower speed suitable for delivery to the cooling bed.
- the bar segments are cooled between the first and second deceleration stages while they are traveling at the intermediate speed.
- Claim 1 provides a system for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed, said apparatus comprising: shear means for subdividing the bar product into bar segments and for alternately directing the bar segments to one or the other of two downstream intermediate paths for continued travel thereon; switch means on each of said intermediate paths for alternately directing bar segments traveling thereon to one or the other of two respective downstream delivery paths for continued travel thereon to said cooling bed; and decelerating means for slowing the bar segments traveling along said delivery paths.
- the system further comprises cooling means for cooling the bar segments traveling along said delivery paths.
- said decelerating means comprises first and second decelerating means spaced one from the other along said delivery paths, said first decelerating means being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating means being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed.
- the distance between said first and second decelerating means is preferably greater than the length of said bar segments.
- system may further comprise cooling means for cooling the bar segments traveling along said delivery paths.
- said cooling means comprises first and second cooling means spaced one from the other along said delivery paths, said first cooling means being located upstream of said first decelerating means, and said second cooling means being located between said first and second decelerating means.
- the distance between said first decelerating means and said second cooling means may be less than the length of the bar segments.
- said decelerating means comprise pinch roll units.
- said cooling means comprises water boxes for applying water to the bar segments.
- Claim 10 provides a system for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed, said apparatus comprising:
- claim 11 provides a system for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed, said apparatus comprising:
- the invention also provides a system for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed, said apparatus comprising: shear means for subdividing the bar product into bar segments and for alternately directing the bar segments to one or the other of two downstream intermediate paths for continued travel thereon; switch means on each of said intermediate paths for alternately directing bar segments traveling thereon to one or the other of two respective downstream delivery paths for continued travel thereon to said cooling bed; and first and second decelerating means spaced one from the other along said delivery paths, said first decelerating means being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating means being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed, the distance between said first and second decelerating means being greater than the length of said bar segments.
- the invention provides a system for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed, said apparatus comprising: shear means for subdividing the bar product into bar segments and for alternately directing the bar segments to one or the other of two downstream intermediate paths for continued travel thereon; switch means on each of said intermediate paths for alternately directing bar segments traveling thereon to one or the other of two respective downstream delivery paths for continued travel thereon to said cooling bed; first and second decelerating means spaced one from the other along said delivery paths, said first decelerating means being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating means being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed; and first and second cooling means spaced one from the other along said delivery paths, said first cooling means being located upstream of said first decelerating means, and said second cooling means being located between said first and second de
- Claim 14 provides a method of receiving a hot rolled bar product from a rolling mill, and delivering the bar product to a cooling bed, said method comprising: subdividing the bar product into bar segments and alternately directing the bar segments to one or the other of two intermediate paths for continued travel thereon; alternately directing bar segments traveling along said intermediate paths to one or the other of two respective delivery paths for continued travel thereon to said cooling bed; and decelerating the bar segments traveling along said delivery paths.
- the method further comprises cooling the bar segments traveling along said delivery paths.
- said bar segments are decelerated in two stages along said delivery paths, said first decelerating stage operating to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating stage operating to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed.
- the second decelerating stage occurs after the first decelerating stage has been completed.
- the method preferably further comprises cooling the bar segments traveling along said delivery paths.
- the method is preferably carried out such that said cooling occurs while said bar segments are undergoing deceleration at said first stage.
- a method of receiving a hot rolled bar product from a rolling mill, and delivering the bar product to a cooling bed comprising: subdividing the bar product into bar segments and alternately directing the bar segments to one or the other of two intermediate paths for continued travel thereon; alternately directing bar segments traveling on said intermediate paths to one or the other of two respective delivery paths for continued travel thereon to said cooling bed; and subjecting the bar segments traveling along said delivery paths to a two stage deceleration, the first deceleration stage being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and the second deceleration stage being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed.
- Claim 21 provides a method of receiving a hot rolled bar product from a rolling mill, and delivering the bar product to a cooling bed, said method comprising: subdividing the bar product into bar segments and alternately directing the bar segments to one or the other of two intermediate paths for continued travel thereon; alternately directing bar segments traveling along said intermediate paths to one or the other of two respective delivery paths for continued travel thereon to said cooling bed; subjecting the bar segments traveling along said delivery paths to a two stage deceleration, the first deceleration stage being operable to siow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and the second deceleration stage being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed; and cooling the bar segments traveling at said intermediate speed.
- a system in accordance with the present invention is shown between the last roll stand 10 of a continuous hot rolling bar mill and a conventional carryover cooling bed 12.
- Bar product exiting from roll stand 10 along path P A is passed through a series of water boxes 14, after which it is subdivided into bar segments by a dividing shear 16.
- the shear 16 which can be of a conventional design known to those skilled in the art, includes a switch mechanism which alternately directs the subdivided bar segments to one or the other of two downstream intermediate paths P B , P C .
- a switch 18 on intermediate path P B then serves to alternately direct the bar segments to one or the other of two downstream delivery paths P D , P E , and a switch 20 on intermediate path P C similarly directs product segments alternately to one or the other of two downstream delivery path P F , P G .
- the side-by-side sets of delivery paths P D , P E and P F , P G lead through a series of water boxes 22 to pinch roll units 24, 26, then around a side loop defined in part by two opposed 180° curves C 1 , C 2 . Curve C 1 is partially formed by a removable guide section 28.
- the side loop includes water boxes 30, and at curve C 2 , the two sets of delivery paths P D , P E and P F , P G are brought into vertical alignment before continuing to pinch roll units 32, 34 preceding the cooling bed 12.
- single tier guide units 36, 38 with laterally spaced guide pipes 40 are employed to direct the bar segments along the laterally disposed and vertically offset sets of delivery paths P D , P E and P F , P G , and two tier trough units 42 are employed to direct the bar segments when the two sets of delivery paths are aligned vertically.
- pinch roll unit 32 has two sets of pinch rolls 44, 46 aligned respectively with delivery paths P G and P F
- pinch roll unit 34 also has two sets of pinch rolls 48, 50 aligned respectively with delivery paths P D and P E .
- Each set of pinch rolls is independently driven via drive shafts 52, a gear box 54 and drive motors 56. The pinch rolls are driven at speeds selected to effect an appropriate deceleration of bar segments frictionally gripped therebetween.
- the pinch roll units 24, 26 are similarly constructed, but arranged slightly differently for alignment with the laterally disposed and vertically staggered guide paths.
- Pinch roll units 24 and 26 will then operate to initially decelerate the bar segments to a lower intermediate speed of about 30 m/sec.
- the bar sections will be directed by the curved guide section 28 around the side loop and through the water boxes 30.
- the linear distance between the pinch roll units 24, 26 and the water boxes 30 is preferably less than the length of the bar segments.
- the water boxes 30 will operate to cool the bar segments down to about 500-600°C before they negotiate curve C 2 .
- the pinch roll units 32, 34 will then operate to further decelerate the bar segments to a speed of about 3-8 m/sec., which will allow the bar segments to slide to a halt at the entry end of the cooling bed 12. From here, transfer mechanisms (not shown) will operate to shift the bar segments laterally onto and across the cooling bed where they will undergo further cooling before reaching the delivery side of the bed.
- the system of the present invention is extremely flexible in that it can accommodate a wide range of products at beneficially high tonnage rates.
- Smaller diameter products e.g., those ranging in diameter from 6.35 to 12.0 mm can be handled at relatively high mill delivery speeds on the order of 60 to 32 m/sec. by passing freely through the water boxes 22 and undergoing initial deceleration by pinch roll units 24, 26 before cooling is effected in water boxes 30.
- Larger diameter products exceeding 12.0 mm in diameter and exiting the mill at slower speeds below about 30 m/sec. can be cooled in the water boxes 22 before initial deceleration by pinch roll units 24, 26.
- two systems of the type depicted in Figure 1 can be arranged side by side to feed the same cooling bed.
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- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
- This invention relates generally to continuous hot rolling bar mills, and is concerned in particular with a system and method for delivering the hot rolled products of such mills to a cooling bed.
- In modern bar mills currently in operation, hot rolled bar products exit the last mill stand, and are subjected to cooling by being passed through one or more water boxes. The bar products are then subdivided into bar segments by a dividing shear, which includes a switching mechanism for alternately directing the bar segments to one or the other of two downstream delivery paths leading to the cooling bed. Pinch roll units, friction pads, or the like serve to decelerate the bar segments traveling along the delivery paths, with the result that the bar segments gradually slide to a halt before being laterally transferred onto the cooling bed.
- Relatively high tonnage rates can be achieved with this type or arrangement when the mill is rolling larger product sizes, e.g., those having diameters above about 10.0 to 12.0 mm. These larger products have enough column strength to resist buckling as they are being pushed through the water boxes at relatively high mill delivery speeds on the order of 10 to 30 m/sec.
- However, as product sizes decrease, so do their column strengths decrease, with the result that mill delivery speeds must be reduced in order to avoid buckling when pushing the smaller product sizes through the water boxes.
- Thus, for example, a single strand mill rolling 8.0 mm rod for delivery to a laying head can operate at a delivery speed of 60 m/sec or greater, yielding a capacity of 85 tons/hour. However, a similar mill rolling 8.0 mm bar for delivery to a cooling bed must necessarily roll at a significantly reduced delivery speed of about 32 m/sec with a reduction in capacity to about 45 tons/hour. The reduced delivery speed for bar products is due in large part to the inability of conventional bar handling systems to bring faster moving products to a halt before they are transferred laterally onto the cooling bed.
- An objective of the present invention is to increase the tonnage rate at which mills are able to roll bar products, in particular smaller product sizes, e.g., those having diameters smaller than about 12.0 mm.
- A companion objective of the present invention is to raise the speed at which the smaller bar products are delivered from the mill, and to then decelerate such bar products before they are cooled in the water boxes prior to being delivered to the cooling bed.
- In accordance with the present invention, hot rolled bar products are subdivided by a dividing shear into bar segments, and the bar segments are alternately directed to one or the other of two downstream intermediate paths. A switch on each intermediate path then alternately directs the bar segments to one or the other of two downstream delivery paths leading to the cooling bed. The bar segments traveling along the four delivery paths are subjected to at least two deceleration stages. The first deceleration stage operates to slow the bar segments to an intermediate speed lower than the speed at which the bar products are delivered from the mill, and the second deceleration stage operates to further slow the bar segments to a lower speed suitable for delivery to the cooling bed. The bar segments are cooled between the first and second deceleration stages while they are traveling at the intermediate speed.
- Claim 1 provides a system for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed, said apparatus comprising: shear means for subdividing the bar product into bar segments and for alternately directing the bar segments to one or the other of two downstream intermediate paths for continued travel thereon; switch means on each of said intermediate paths for alternately directing bar segments traveling thereon to one or the other of two respective downstream delivery paths for continued travel thereon to said cooling bed; and decelerating means for slowing the bar segments traveling along said delivery paths.
- Preferably, the system further comprises cooling means for cooling the bar segments traveling along said delivery paths.
- According to
claim 3, said decelerating means comprises first and second decelerating means spaced one from the other along said delivery paths, said first decelerating means being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating means being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed. - The distance between said first and second decelerating means is preferably greater than the length of said bar segments.
- In addition to this, the system may further comprise cooling means for cooling the bar segments traveling along said delivery paths.
- Accorsding to another embodiment, said cooling means comprises first and second cooling means spaced one from the other along said delivery paths, said first cooling means being located upstream of said first decelerating means, and said second cooling means being located between said first and second decelerating means.
- Furthermore, the distance between said first decelerating means and said second cooling means may be less than the length of the bar segments.
- According to another embodiment, said decelerating means comprise pinch roll units.
- According to another embodiment, said cooling means comprises water boxes for applying water to the bar segments.
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Claim 10 provides a system for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed, said apparatus comprising: - shear means for subdividing the bar product into bar segments and for alternately directing the bar segments to one or the other of two downstream intermediate paths for continued travel thereon;
- switch means on each of said intermediate paths for alternately directing bar segments traveling thereon to one or the other of two respective downstream delivery paths for continued travel thereon to said cooling bed; and
- first and second decelerating means spaced one from the other along said delivery paths, said first decelerating means being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating means being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed.
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- Further, claim 11 provides a system for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed, said apparatus comprising:
- shear means for subdividing the bar product into bar segments and for alternately directing the bar segments to one or the other of two downstream intermediate paths for continued travel thereon;
- switch means on each of said intermediate paths for alternately directing bar segments traveling thereon to one or the other of two respective downstream delivery paths for continued travel thereon to said cooling bed;
- first and second decelerating means spaced one from the other along said delivery paths, said first decelerating means being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating means being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed; and
- first and second cooling means spaced one from the other along said delivery paths, said first cooling means being located upstream of said first decelerating means, and said second cooling means being located between said first and second decelerating means.
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- The invention also provides a system for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed, said apparatus comprising: shear means for subdividing the bar product into bar segments and for alternately directing the bar segments to one or the other of two downstream intermediate paths for continued travel thereon; switch means on each of said intermediate paths for alternately directing bar segments traveling thereon to one or the other of two respective downstream delivery paths for continued travel thereon to said cooling bed; and first and second decelerating means spaced one from the other along said delivery paths, said first decelerating means being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating means being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed, the distance between said first and second decelerating means being greater than the length of said bar segments.
- In addition to this, the invention provides a system for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed, said apparatus comprising: shear means for subdividing the bar product into bar segments and for alternately directing the bar segments to one or the other of two downstream intermediate paths for continued travel thereon; switch means on each of said intermediate paths for alternately directing bar segments traveling thereon to one or the other of two respective downstream delivery paths for continued travel thereon to said cooling bed; first and second decelerating means spaced one from the other along said delivery paths, said first decelerating means being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating means being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed; and first and second cooling means spaced one from the other along said delivery paths, said first cooling means being located upstream of said first decelerating means, and said second cooling means being located between said first and second decelerating means, the distance between said first decelerating means and said second cooling means is less than the length of the bar segments.
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Claim 14 provides a method of receiving a hot rolled bar product from a rolling mill, and delivering the bar product to a cooling bed, said method comprising: subdividing the bar product into bar segments and alternately directing the bar segments to one or the other of two intermediate paths for continued travel thereon; alternately directing bar segments traveling along said intermediate paths to one or the other of two respective delivery paths for continued travel thereon to said cooling bed; and decelerating the bar segments traveling along said delivery paths. - Preferably, the method further comprises cooling the bar segments traveling along said delivery paths.
- According to still another embodiment, said bar segments are decelerated in two stages along said delivery paths, said first decelerating stage operating to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating stage operating to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed.
- Preferably, the second decelerating stage occurs after the first decelerating stage has been completed.
- In addition to this, the method preferably further comprises cooling the bar segments traveling along said delivery paths.
- In addition to this, the method is preferably carried out such that said cooling occurs while said bar segments are undergoing deceleration at said first stage.
- According to
claim 20, a method of receiving a hot rolled bar product from a rolling mill, and delivering the bar product to a cooling bed is provided, said method comprising: subdividing the bar product into bar segments and alternately directing the bar segments to one or the other of two intermediate paths for continued travel thereon; alternately directing bar segments traveling on said intermediate paths to one or the other of two respective delivery paths for continued travel thereon to said cooling bed; and subjecting the bar segments traveling along said delivery paths to a two stage deceleration, the first deceleration stage being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and the second deceleration stage being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed. - Claim 21 provides a method of receiving a hot rolled bar product from a rolling mill, and delivering the bar product to a cooling bed, said method comprising: subdividing the bar product into bar segments and alternately directing the bar segments to one or the other of two intermediate paths for continued travel thereon; alternately directing bar segments traveling along said intermediate paths to one or the other of two respective delivery paths for continued travel thereon to said cooling bed; subjecting the bar segments traveling along said delivery paths to a two stage deceleration, the first deceleration stage being operable to siow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and the second deceleration stage being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed; and cooling the bar segments traveling at said intermediate speed.
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- Figure 1 is a plan view of a system in accordance with the present invention in a configuration suitable for handling smaller diameter higher speed bar products;
- Figure 2A, 2B and 2C are enlarged views, respectively, of the areas between reference planes A-B, B-C, and C-D of Figure 1;
- Figure 3 is a sectional view on an enlarged scale taken along line 3-3 of Figure 2B;
- Figure 4 is an enlarged front view of a pair of pinch roll units taken along line 4-4 of Figure 2C;
- Figure 5 is a partial plan and horizontal sectional view taken along line 5-5 of Figure 4; Figure 6 is a view similar to Figure 2B showing the system reconfigured to handle larger diameter slower moving bar products; and
- Figure 7 is a plan view showing two of the systems depicted in Figure 1 in a side-by-side mirror image arrangement.
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- With reference initially to Figures 1 and 2A-C, a system in accordance with the present invention is shown between the
last roll stand 10 of a continuous hot rolling bar mill and a conventionalcarryover cooling bed 12. Bar product exiting fromroll stand 10 along path PA is passed through a series ofwater boxes 14, after which it is subdivided into bar segments by a dividingshear 16. Theshear 16, which can be of a conventional design known to those skilled in the art, includes a switch mechanism which alternately directs the subdivided bar segments to one or the other of two downstream intermediate paths PB, PC. A switch 18 on intermediate path PB then serves to alternately direct the bar segments to one or the other of two downstream delivery paths PD, PE, and aswitch 20 on intermediate path PC similarly directs product segments alternately to one or the other of two downstream delivery path PF, PG. The side-by-side sets of delivery paths PD, PE and PF, PG lead through a series ofwater boxes 22 topinch roll units removable guide section 28. The side loop includeswater boxes 30, and at curve C2, the two sets of delivery paths PD, PE and PF, PG are brought into vertical alignment before continuing to pinchroll units cooling bed 12. - With reference to Figure 3, it will be seen that single
tier guide units guide pipes 40 are employed to direct the bar segments along the laterally disposed and vertically offset sets of delivery paths PD, PE and PF, PG, and twotier trough units 42 are employed to direct the bar segments when the two sets of delivery paths are aligned vertically. - As can best be seen in Figures 4 and 5,
pinch roll unit 32 has two sets ofpinch rolls pinch roll unit 34 also has two sets ofpinch rolls gear box 54 anddrive motors 56. The pinch rolls are driven at speeds selected to effect an appropriate deceleration of bar segments frictionally gripped therebetween. - The
pinch roll units - An exemplary operation of the above-described system will now be further described with reference to the handling of a 8.0 mm diameter bar product exiting from the last roll stand 10 at a relatively high speed of 60 m/sec. and at a temperature of about 950-1050°C. The
water boxes 14 are shut down, allowing the bar product to pass freely therethrough to theshear 16 where it is subdivided into successive bar segments. The switch mechanism of the shear will alternately direct the bar segments to intermediate paths PB, PC. Bar segments traveling on path PB will then be alternately directed byswitch 18 to delivery paths PD, PE, and bar segments traveling on intermediate path PC will likewise be alternately directed byswitch 20 to delivery paths PF, PG. - Pinch
roll units curved guide section 28 around the side loop and through thewater boxes 30. The linear distance between thepinch roll units water boxes 30 is preferably less than the length of the bar segments. Thus, the bar segments will enter thewater boxes 30 at a beneficially reduced speed and while they are still being acted upon by thepinch roll units water boxes 30 will operate to cool the bar segments down to about 500-600°C before they negotiate curve C2. Thepinch roll units bed 12. From here, transfer mechanisms (not shown) will operate to shift the bar segments laterally onto and across the cooling bed where they will undergo further cooling before reaching the delivery side of the bed. - Of particular importance to the present invention is the provision of multiple delivery paths for the successive bar segments produced by the dividing
shear 16. By way of example, a typical sequence would involve directing successive bar segments from the shear to the following paths:Intermediate Paths Delivery Paths PB PD PC PF PB PE PC PG - Only every fourth bar segment is directed to each delivery path, thus allowing ample time and space along each delivery path for one bar segment to begin decelerating before the next bar segment is received.
- As shown in Figure 6, when handling larger diameter slower bar products the system is reconfigured by replacing the
curved guide section 28 with a straighttapering guide section 58. This bypasses the side loop formed between the 180° turns C1 and C2. - In this operational mode, the increased column strength of the larger diameter product and the slower delivery speed of the mill will allow cooling to take place in the
water boxes 22. Two stage deceleration will then take place, initially by thepinch roll units pinch roll units - It will thus be seen that the system of the present invention is extremely flexible in that it can accommodate a wide range of products at beneficially high tonnage rates. Smaller diameter products, e.g., those ranging in diameter from 6.35 to 12.0 mm can be handled at relatively high mill delivery speeds on the order of 60 to 32 m/sec. by passing freely through the
water boxes 22 and undergoing initial deceleration bypinch roll units water boxes 30. Larger diameter products exceeding 12.0 mm in diameter and exiting the mill at slower speeds below about 30 m/sec. can be cooled in thewater boxes 22 before initial deceleration bypinch roll units - As shown in Figure 7, two systems of the type depicted in Figure 1 can be arranged side by side to feed the same cooling bed.
Claims (21)
- A system for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed, said apparatus comprising:shear means for subdividing the bar product into bar segments and for alternately directing the bar segments to one or the other of two downstream intermediate paths for continued travel thereon;switch means on each of said intermediate paths for alternately directing bar segments traveling thereon to one or the other of two respective downstream delivery paths for continued travel thereon to said cooling bed; anddecelerating means for slowing the bar segments traveling along said delivery paths.
- The system as claimed in claim 1 further comprising cooling means for cooling the bar segments traveling along said delivery paths.
- The system as claimed in claim 1 wherein said decelerating means comprises first and second decelerating means spaced one from the other along said delivery paths, said first decelerating means being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating means being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed.
- The system as claimed in claim 3 wherein the distance between said first and second decelerating means is greater than the length of said bar segments.
- The system as claimed in claims 3 or 4 further comprising cooling means for cooling the bar segments traveling along said delivery paths.
- The system as claimed in claim 5 wherein said cooling means comprises first and second cooling means spaced one from the other along said delivery paths, said first cooling means being located upstream of said first decelerating means, and said second cooling means being located between said first and second decelerating means.
- The system as claimed in claim 6 wherein the distance between said first decelerating means and said second cooling means is less than the length of the bar segments.
- The system as claimed in claim 1 wherein said decelerating means comprise pinch roll units.
- The system as claimed in claim 2 wherein said cooling means comprises water boxes for applying water to the bar segments.
- A system for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed, said apparatus comprising:shear means for subdividing the bar product into bar segments and for alternately directing the bar segments to one or the other of two downstream intermediate paths for continued travel thereon;switch means on each of said intermediate paths for alternately directing bar segments traveling thereon to one or the other of two respective downstream delivery paths for continued travel thereon to said cooling bed; andfirst and second decelerating means spaced one from the other along said delivery paths, said first decelerating means being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating means being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed.
- A system for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed, said apparatus comprising:shear means for subdividing the bar product into bar segments and for alternately directing the bar segments to one or the other of two downstream intermediate paths for continued travel thereon;switch means on each of said intermediate paths for alternately directing bar segments traveling thereon to one or the other of two respective downstream delivery paths for continued travel thereon to said cooling bed;first and second decelerating means spaced one from the other along said delivery paths, said first decelerating means being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating means being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed; andfirst and second cooling means spaced one from the other along said delivery paths, said first cooling means being located upstream of said first decelerating means, and said second cooling means being located between said first and second decelerating means.
- A system for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed, said apparatus comprising:shear means for subdividing the bar product into bar segments and for alternately directing the bar segments to one or the other of two downstream intermediate paths for continued travel thereon;switch means on each of said intermediate paths for alternately directing bar segments traveling thereon to one or the other of two respective downstream delivery paths for continued travel thereon to said cooling bed; and
first and second decelerating means spaced one from the other along said delivery paths, said first decelerating means being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating means being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed, the distance between said first and second decelerating means being greater than the length of said bar segments. - A system for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed, said apparatus comprising:shear means for subdividing the bar product into bar segments and for alternately directing the bar segments to one or the other of two downstream intermediate paths for continued travel thereon;switch means on each of said intermediate paths for alternately directing bar segments traveling thereon to one or the other of two respective downstream delivery paths for continued travel thereon to said cooling bed;first and second decelerating means spaced one from the other along said delivery paths, said first decelerating means being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating means being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed; andfirst and second cooling means spaced one from the other along said delivery paths, said first cooling means being located upstream of said first decelerating means, and said second cooling means being located between said first and second decelerating means, the distance between said first decelerating means and said second cooling means is less than the length of the bar segments.
- A method of receiving a hot rolled bar product from a rolling mill, and delivering the bar product to a cooling bed, said method comprising:subdividing the bar product into bar segments and alternately directing the bar segments to one or the other of two intermediate paths for continued travel thereon;alternately directing bar segments traveling along said intermediate paths to one or the other of two respective delivery paths for continued travel thereon to said cooling bed; anddecelerating the bar segments traveling along said delivery paths.
- The method as claimed in claim 14 further comprising cooling the bar segments traveling along said delivery paths.
- The method as claimed in claim 14 wherein said bar segments are decelerated in two stages along said delivery paths, said first decelerating stage operating to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and said second decelerating stage operating to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed.
- The method as claimed in claim 16 wherein the second decelerating stage occurs after the first decelerating stage has been completed.
- The method as claimed in claims 16 or 17 further comprising cooling the bar segments traveling along said delivery paths.
- The method as claimed in claim 18 wherein said cooling occurs while said bar segments are undergoing deceleration at said first stage.
- A method of receiving a hot rolled bar product from a rolling mill, and delivering the bar product to a cooling bed, said method comprising:subdividing the bar product into bar segments and alternately directing the bar segments to one or the other of two intermediate paths for continued travel thereon;alternately directing bar segments traveling on said intermediate paths to one or the other of two respective delivery paths for continued travel thereon to said cooling bed; andsubjecting the bar segments traveling along said delivery paths to a two stage deceleration, the first deceleration stage being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and the second deceleration stage being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed.
- A method of receiving a hot rolled bar product from a rolling mill, and delivering the bar product to a cooling bed, said method comprising:subdividing the bar product into bar segments and alternately directing the bar segments to one or the other of two intermediate paths for continued travel thereon;alternately directing bar segments traveling along said intermediate paths to one or the other of two respective delivery paths for continued travel thereon to said cooling bed;subjecting the bar segments traveling along said delivery paths to a two stage deceleration, the first deceleration stage being operable to slow the bar segments to an intermediate speed lower than the speed at which the bar product is delivered from said rolling mill, and the second deceleration stage being operable to further slow the bar segments from said intermediate speed to a lower speed suitable for delivery to said cooling bed; andcooling the bar segments traveling at said intermediate speed.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US43241402P | 2002-12-11 | 2002-12-11 | |
US432414P | 2002-12-11 | ||
US10/701,676 US7069759B2 (en) | 2003-11-05 | 2003-11-05 | Bar delivery system and method |
US701676 | 2003-11-05 |
Publications (2)
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EP1428587A1 true EP1428587A1 (en) | 2004-06-16 |
EP1428587B1 EP1428587B1 (en) | 2006-05-10 |
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EP03026500A Expired - Lifetime EP1428587B1 (en) | 2002-12-11 | 2003-11-21 | System and method for delivering the hot rolled products of hot rolling mills to a cooling bed |
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Country | Link |
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EP (1) | EP1428587B1 (en) |
JP (1) | JP4092286B2 (en) |
KR (1) | KR100563535B1 (en) |
CN (1) | CN1291804C (en) |
AT (1) | ATE325668T1 (en) |
BR (1) | BR0305948B1 (en) |
CA (1) | CA2448784C (en) |
DE (1) | DE60305134T2 (en) |
ES (1) | ES2261851T3 (en) |
MX (1) | MXPA03011319A (en) |
RU (1) | RU2254188C1 (en) |
TW (1) | TWI244949B (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2505368C1 (en) * | 2012-07-18 | 2014-01-27 | Общество с Ограниченной Ответственностью Научно-производственное предприятие "ИНЖМЕТ" | Device for electromagnetic braking and cross-drive of long-length thermo-strengthened ferromagnetic rolled steel |
RU2516324C2 (en) * | 2012-07-18 | 2014-05-20 | Общество с Ограниченной Ответственностью Научно-производственное предприятие "ИНЖМЕТ" | Device for electromagnetic deceleration of heat-hardened ferromagnetic reinforcing bar upstream of refrigerator |
EP1877203B2 (en) † | 2005-03-02 | 2015-12-09 | DANIELI & C. OFFICINE MECCANICHE S.p.A. | Compact plant for continuous production of bars and/or profiles |
CN112037194A (en) * | 2020-08-31 | 2020-12-04 | 中冶赛迪重庆信息技术有限公司 | Method, system, equipment and medium for detecting disordered steel of cooling bed |
CN112296101A (en) * | 2020-10-16 | 2021-02-02 | 广东恒华重工有限公司 | High-speed steel feeding system on high-rod steel rolling production line |
EP3892394A1 (en) * | 2020-04-08 | 2021-10-13 | ABB Schweiz AG | Method and control system for delivering rolling stock to a cooling bed |
Families Citing this family (7)
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US7228972B2 (en) * | 2005-04-18 | 2007-06-12 | Morgan Construction Company | Short bar separation and recovery system and method |
US7207202B1 (en) * | 2006-05-30 | 2007-04-24 | Morgan Construction Company | Method of subdividing and decelerating hot rolled long products |
US7219521B1 (en) | 2006-09-19 | 2007-05-22 | Morgan Construction Company | Rolling mill product handling system |
JP5336302B2 (en) * | 2009-08-25 | 2013-11-06 | 株式会社神戸製鋼所 | Steel pinch roller device |
JP5751129B2 (en) * | 2011-10-26 | 2015-07-22 | 大同特殊鋼株式会社 | Long material turning device |
US10150148B2 (en) * | 2014-01-02 | 2018-12-11 | Danieli & C. Officine Meccaniche S.P.A. | Bar unloading apparatus of the revolver type provided with braking device |
CN111647734B (en) * | 2020-07-12 | 2022-04-19 | 首钢集团有限公司 | Preparation method of annealing-free hot-rolled bar and product thereof |
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- 2003-11-10 CA CA002448784A patent/CA2448784C/en not_active Expired - Fee Related
- 2003-11-21 AT AT03026500T patent/ATE325668T1/en active
- 2003-11-21 EP EP03026500A patent/EP1428587B1/en not_active Expired - Lifetime
- 2003-11-21 ES ES03026500T patent/ES2261851T3/en not_active Expired - Lifetime
- 2003-11-21 DE DE60305134T patent/DE60305134T2/en not_active Expired - Lifetime
- 2003-12-08 MX MXPA03011319A patent/MXPA03011319A/en active IP Right Grant
- 2003-12-08 TW TW092134592A patent/TWI244949B/en not_active IP Right Cessation
- 2003-12-09 BR BRPI0305948-0A patent/BR0305948B1/en not_active IP Right Cessation
- 2003-12-10 RU RU2003136021/02A patent/RU2254188C1/en not_active IP Right Cessation
- 2003-12-10 KR KR1020030089239A patent/KR100563535B1/en not_active IP Right Cessation
- 2003-12-11 JP JP2003412704A patent/JP4092286B2/en not_active Expired - Fee Related
- 2003-12-11 CN CNB2003101225555A patent/CN1291804C/en not_active Expired - Fee Related
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Cited By (8)
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EP1877203B2 (en) † | 2005-03-02 | 2015-12-09 | DANIELI & C. OFFICINE MECCANICHE S.p.A. | Compact plant for continuous production of bars and/or profiles |
RU2505368C1 (en) * | 2012-07-18 | 2014-01-27 | Общество с Ограниченной Ответственностью Научно-производственное предприятие "ИНЖМЕТ" | Device for electromagnetic braking and cross-drive of long-length thermo-strengthened ferromagnetic rolled steel |
RU2516324C2 (en) * | 2012-07-18 | 2014-05-20 | Общество с Ограниченной Ответственностью Научно-производственное предприятие "ИНЖМЕТ" | Device for electromagnetic deceleration of heat-hardened ferromagnetic reinforcing bar upstream of refrigerator |
EP3892394A1 (en) * | 2020-04-08 | 2021-10-13 | ABB Schweiz AG | Method and control system for delivering rolling stock to a cooling bed |
CN112037194A (en) * | 2020-08-31 | 2020-12-04 | 中冶赛迪重庆信息技术有限公司 | Method, system, equipment and medium for detecting disordered steel of cooling bed |
CN112037194B (en) * | 2020-08-31 | 2023-04-07 | 中冶赛迪信息技术(重庆)有限公司 | Method, system, equipment and medium for detecting disordered steel of cooling bed |
CN112296101A (en) * | 2020-10-16 | 2021-02-02 | 广东恒华重工有限公司 | High-speed steel feeding system on high-rod steel rolling production line |
CN112296101B (en) * | 2020-10-16 | 2022-06-17 | 广东恒华重工有限公司 | High-speed steel feeding system on high-rod steel rolling production line |
Also Published As
Publication number | Publication date |
---|---|
KR100563535B1 (en) | 2006-03-23 |
EP1428587B1 (en) | 2006-05-10 |
CA2448784A1 (en) | 2004-06-11 |
BR0305948A (en) | 2004-08-31 |
ATE325668T1 (en) | 2006-06-15 |
RU2254188C1 (en) | 2005-06-20 |
BR0305948B1 (en) | 2012-02-07 |
JP4092286B2 (en) | 2008-05-28 |
DE60305134D1 (en) | 2006-06-14 |
KR20040051520A (en) | 2004-06-18 |
ES2261851T3 (en) | 2006-11-16 |
CA2448784C (en) | 2009-01-20 |
TW200410770A (en) | 2004-07-01 |
MXPA03011319A (en) | 2004-12-07 |
DE60305134T2 (en) | 2007-02-22 |
CN1507961A (en) | 2004-06-30 |
CN1291804C (en) | 2006-12-27 |
TWI244949B (en) | 2005-12-11 |
JP2004188499A (en) | 2004-07-08 |
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