MXPA03011319A

MXPA03011319A - Bar delivery system and method.

Info

Publication number: MXPA03011319A
Application number: MXPA03011319A
Authority: MX
Inventors: Palfreman Matthew
Original assignee: Morgan Construction Co
Priority date: 2002-12-11
Filing date: 2003-12-08
Publication date: 2004-12-07
Also published as: CA2448784A1; EP1428587A1; DE60305134D1; CN1507961A; CA2448784C; CN1291804C; BR0305948A; JP2004188499A; EP1428587B1; DE60305134T2; JP4092286B2; ES2261851T3; ATE325668T1; BR0305948B1; TWI244949B; KR100563535B1; KR20040051520A; TW200410770A; RU2254188C1

Abstract

A method and system are disclosed for receiving a hot rolled bar product from a rolling mill, and for delivering the bar product to a cooling bed. A shear subdivides the bar product into bar segments and alternately directs the bar segments to one or the other of two downstream intermediate paths for continued travel thereon. A switch on each of said intermediate paths alternately directs bar segments travelling thereon to one or the other of two respective downstream delivery paths for continued travel thereon to the cooling bed. Decelerators slow the bar segments travelling along the delivery paths.

Description

SYSTEM AND METHOD OF SUPPLY BAR Field of the Invention The present invention relates generally to continuous hot rolled bar rolling mills, and in particular, to a system and method for supplying the hot rolled products of said rolling mills to a cooling bed.

BACKGROUND OF THE INVENTION In modern bar mills currently in operation, the hot rolled bar products leave the last mill, and are subjected to cooling by being passed through one or more boxes of water. The bar products are then subdivided into bar segments by a splitter, which includes a shift mechanism to alternatively steer the bar segments to one or other of the two up feed paths leading to the cooling bed. The shrinkage roller units of the reef, the friction paths or the like, serve to decelerate the bar segments traveling along the supply path with the result that the bar segments gradually slide to a stop before be transferred laterally on the cooling bed. The relatively high tonnage ratios that can be achieved by this type of adaptation when the laminator is laminating larger-sized products, for example, those having diameters greater than between approximately 10.0 and 2.0 mm, these larger products they have sufficient column strength to resist deformation as they are being driven through the water boxes at relatively high laminator supply speeds of the order of 10 to 30 m / sec. However, as the size of the product decreases, so do the resistances of the column, resulting in that the mill supply speeds can be reduced in order to avoid deformation when the smaller product sizes are being driven to through the water boxes. Therefore, for example, a single section of 8.0 mm rolled bar for supply to a head can operate at a supply speed of 60 m / sec or greater, producing a capacity of 85 tonnes / hour. However, in order to supply a similar roll bar of 8.0 mm to a cooling bed, it must necessarily rotate at an important net supply speed of approximately 32 m / sec with a reduction in capacity to approximately 45 tons / hour. The reduced supply speed for bar products is largely due to the lack of capacity of conventional bar handling systems to produce products that move faster to a stop before they are laterally transferred onto the bar. cooling bed. An object of the present invention is to increase the tonnage index at which the mill products can roll the mills, in particularly smaller product sizes, for example, those having diameters less than about 2.0 mm. A companion adjective of the present invention is to raise the speed at which the smaller bar products from the mill are supplied, and then decelerate said bar products before they are cooled in the cooling boxes before being supplied. to the cooling bed. SUMMARY OF THE INVENTION In accordance with the present invention, the hot rolled bar products are subdivided into bar segments by a splitter, and the bar segments are alternately directed to one or the other path of the two intermediate down paths. . A change in each intermediate path then alternatively directs the bar segments to one or the other of the two downstream supply paths leading to the cooling bed. Bar segments traveling through the four supply paths are decelerated, preferably in at least two stages. The first stage of deceleration operates to decrease the speed of the bar segments at a lower intermediate speed than the speed at which the bar products are supplied from the laminator, and the second stage of deceleration operates to lower the speed of the bar further. the bar segments at a lower speed suitable for supply to the cooling bed. The bar segments are then cooled between the first and second deceleration stages while traveling at an intermediate speed. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a plan view of a system according to the present invention in a suitable configuration for handling products of smaller diameter bar at a higher speed; Figures 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 reefer contraction roller units taken along line 4-4 of Figure 2C; Figure 5 is a horizontal sectional view and a partial plan view taken along line 5-5 of Figure 4; Figure 6 is a view similar to Figure 2B showing the reconfigured system for handling slower-moving bar products of larger diameter; and Figure 7 is a plan view showing two of the systems illustrated in Figure 1 in a mirror image adaptation side by side. Detailed Description of the Invention Initially referring to Figures 1 and 2A to the 2C, a system according to the present invention is shown between the last rolling step 10 of a continuous rolling bar mill of hot rolling and a conventional cooling bed of transport to the next step 12. The bar product coming out of the rolling step 10 along the path PA is passed through a series of water boxes 14, after which it is subdivided into bar segments by a division cutter 16. The cutter 16, which can be of a conventional design known to those skilled in the art, includes a shift mechanism which alternati steers the subdivided bar segments to one or the other of the two intermediate down paths PB PC. A change 18 in the intermediate path PB then serves to alternately direct the bar segments to one or the other of the two downstream PD and PE supply paths, and a change 20 in the intermediate path PC similarly directs the product segments alternati to one or the other downstream supply path PF, PG- The side-by-side delivery path sets PD, PE and PF, PG lead through a series of water boxes 22 to the reef contraction roller units 24, 26, then around a lateral circuit defined in part by two opposing curves of 1 80 ° C-,, C2. Curve C-i is partially formed by a guiding section that can be removed 28. The lateral circuit includes water boxes 30, and in curve C2, the two supply path sets PD, P E and PF. G are brought to a vertical alignment before proceeding to the retraction roller units of the reef 32, 34 that precede the cooling bed 1 2. Referring to Figure 3, it can be seen that simple union units are used. 36, 38 with laterally spaced guide tubes 40 for directing the bar segments along the vertically offset PD, PE, and PF, PG supply path assemblies, and the two junction units 42 are employed to direct the Bar segments when the two supply path sets are aligned vertically.

As best seen in Figures 4 and 5, the reef contraction roller unit 32 has two sets of reef contraction rollers 44, 46 aligned respecti with the PG and PF supply paths, and the shrink roller unit. of reef 34 also has two sets of reef contraction rollers 48, 50 aligned respecti with the supply paths PD and PE. Each of the reef contraction roller assemblies is operated independently by means of transmission arrows 52, a gearbox 54, and operation motors 56. The retraction rollers of the reef are operated at selected speeds to effect a deceleration of the bar segments held by friction between them. The retraction roller units of the reef 24, 26 are constructed in a similar manner, but arranged in a slightly different manner for alignment with the vertically staggered and laterally positioned guide paths. An example operation of the system described above will be described in greater detail with reference to the supply to a cooling bed of a bar product with a diameter of 8.0 mm that leaves the last rolling stage 10 at a relati high speed of 60 m / sec, and at a temperature between approximately 950 ° C and 1050 ° C. The water boxes 14 are closed allowing the bar products to pass freely through them to the carrier 16 where they are subdivided into successive bar segments. The cutter change mechanism alternately steers the bar segments to the intermediate paths PB- Pe- The bar segments trang in the path PB can then be alternately steered by the change 18 to the PD supply paths., PE, and the bar segments traveling in the intermediate path Pc are similarly directed to the change 20 to the supply paths PF, PG- Then, the retraction roller units of the reef 24 and 26 operate to decelerate initially the bar segments at a slower intermediate speed of approximately 30 m / sec. The bar sections are guided by a curved guide section 28 around the lateral circuit and through the water boxes 30. The linear distance between the contraction roller units of the reef 24, 26 and the water boxes 30, is preference less than the length q ue. the bar segments. Therefore, the bar segments enter the water boxes 30 at a profitably reduced rate and while they remain there being operated by the retraction roller units of the reef 24, 26. The water boxes 30 operate to cool the segments. of bar at lower temperatures of approximately 500 ° C up to 600 ° C before freeing curve C2. The reef contraction roller units 32, 34 then operate to further decelerate the bar segments at a rate of about 3 to 8 m / sec, which will allow the bar segments to slide to a stop at the end of the bar. cooling bed inlet 1 2. From there, the transfer mechanisms (not shown) operate to change the bar segments laterally over and across the width of the cooling bed where they undergo additional cooling before reaching the supply side of the cooling bed. bed. Of particular importance to the present invention is the provision of multiple supply paths for successive bar segments leaving the division cutter 1 6 coupled with the multiple supply paths for the products passing through the changes 1 8, 20 In the previous example, the successive bar segments would be repeatedly subjected to the following sequence: Intermediate Trajectories Supply Pathways Pe 'PF PB, PE Only the fourth bar segment is directed to each supply path thus allowing a time and wide space along each supply path so that one bar segment begins to decelerate before the next bar segment is received. As shown in Figure 6, when handling slower bar products of larger diameter the system is reconfigured by replacing the curved guide section 28 with a straight tapered guide section 58. This deviates from the lateral circuit formed between the turns Ci and C2 of 180 °. In this mode of operation, the increased strength of the column of the product with the largest diameter, and the slowest delivery speed of the laminator will allow cooling to take place in the water boxes 22. The two stages of deceleration will take place then initially by means of the retraction roller units of the reef 24, 26 and then by the reef contraction roller units 32, 34. Therefore, it can be seen that the system of the present invention is extremely flexible, due to because it can accommodate a wide range of products in beneficially high tonnage rates. Products of smaller diameter, for example, those in a diameter range of 6.35 to 12.0 mm can be handled at relatively high laminator supply speeds of the order of 60 to 32 m / sec, passing freely through the water boxes 22 and going through an initial deceleration by the shrink roll units of the reef 24, 26 before the cooling is effected in the water boxes 30. The larger diameter products exceeding 12.0 mm in diameter and they leave the laminator at slower speeds lower than about 30 m / sec, they can be used in the crates 22 before the initial deceleration by the retraction roller units of the reef 24, 26. As shown in Figure 7, two systems of the type illustrated in Figure 1 can be accommodated side by side to feed the same cooling bed.

Claims

CLAIMS 1. - A system for receiving the hot rolled bar product from a bar mill and for supplying the product to a cooling bed, said apparatus comprising: cutting means for subdividing the bar product into bar segments and for alternatively dirng the bar segments to one or the other of the two intermediate descending paths for continuous travel over them; means of change in each of the intermediate paths to alternatively steer the bar segments traveling thereon to one or the other of the two downstream supply paths for continuous travel thereon to the cooling bed; and deceleration means for decreasing the speed for the bar segments traveling along the supply paths. 2. - The system as and as described in claim 1, which further comprises cooling means for cooling the bar segments traveling along the trajries of. supply. 3. The system as described in claim 1, characterized in that the deceleration means comprise first and second deceleration means separated from each other along the supply paths, the first deceleration means being operable to decrease the speed of the bar segments at an intermediate speed lower than the speed at which the bar products are supplied from the bar rolling mill, and the second slowing means can be operated to further decrease the speed of the bar segments of the bar. the intermediate speed at a lower speed suitable for supply to the cooling bed. 4. - The system as described in claim 3, characterized in that the distance between the first and second deceleration means is greater than the length of the bar segments. 5. - The system as described in claims 3 or 4 which further comprises cooling means for cooling the bar segments traveling along the supply paths. 6. - The system as described in claim 5, wherein the cooling means comprises first and second cooling means separated from each other along the supply paths, the first cooling means being located at the upper part of the first deceleration means, and the second cooling means being located between the first and second deceleration means. 7. - The system as described in claim 6, characterized in that the distance between the first deceleration means, and the second cooling means is less than the length of the bar segments. 8. The system as described in claim 1, characterized in that the deceleration means comprise reef contraction roller units. 9. The system as described in claim 2, characterized in that the cooling means comprise water boxes to apply water to the bar segments. 10. A system for receiving hot-rolled bar products from a bar mill, and for supplying the bar product to a cooling bed, the apparatus comprising: cutting means for subdividing the bar product into bar segments and to alternatively steer the bar segments to one or the other of the two intermediate down paths for continuous travel thereon; means of change in each of the intermediate paths to alternatively steer the bar segments traveling thereon to one or the other of the two respve downstream supply paths for continuous travel thereon to a cooling bed; and first and second deceleration means separated therebetween along the delivery paths, the first deceleration measures being able to operate to decrease the speed of the bar segments at an intermediate speed lower than the speed at which the bar products are supplied from the bar laminator, and the second deceleration means being operable for further decrease the speed of the bar segments of the intermediate speed at a lower speed suitable for supply to the cooling bed. 1 - A system for receiving hot-rolled bar products from a bar mill and for supplying the bar product to a cooling bed, the apparatus comprising: cutting means for subdividing the bar product into bar segments and to alternatively direct the bar segments to one or the other of the two intermediate down paths for continuous travel over the same; means of change in each of the intermediate paths to alternately direct the bar segments traveling thereto to one or the other of the two respective downstream supply paths for continuous travel thereon to the cooling bed; first and second deceleration means separated therebetween along the supply paths, the first deceleration means being operable to decrease the speed of the bar segments at an intermediate speed lower than the speed at which the products are supplied of the bar laminator bar, and the second deceleration means being operable to further decrease the speed of the bar segments of the intermediate speed at a lower speed suitable for supply to the cooling bed; and first and second cooling means separated therebetween in the supply paths, the first cooling means being located in the upper part of the first deceleration measures,. and the second cooling means being located between the first and second deceleration means. 2. A system for a hot-rolled bar product of a bar rolling mill, for supplying the bar product to a cooling bed, the apparatus comprising: cutting means for subdividing the bar product into bar segments and to alternatively steer the bar segments to one or the other of the two intermediate descending paths for continuous travel thereon; means of change in each of the intermediate paths to alternatively steer the bar segments traveling thereto to one or the other of the two respective downstream supply paths for continuous travel thereon to a cooling bed; and first and second deceleration means separated therebetween along the supply paths, the first deceleration means being able to operate to decrease the speed of the bar segments at an intermediate speed lower than the speed at which they are supplied. bar products from the bar laminator, and the second deceleration means being operable to further decrease the speed of the bar segments of the intermediate speed at a lower speed suitable for supply to the cooling bed, the distance between the first and second deceleration means greater than the length of the bar segments. 13. A system for receiving a rolled bar product, hot from the bar rolling mill, and for supplying the bar product to a cooling bed, the apparatus comprising: cutting means for subdividing the bar product into segments of bar and to alternatively direct the bar segments to one or the other of the two intermediate down paths for continuous travel thereon; means of change in each of the intermediate paths to alternatively steer the bar segments traveling thereto to one or the other of the two respective downstream supply paths for continuous travel thereon to a cooling bed; and first and second deceleration means separated therebetween along the supply paths, the first deceleration means being operable to decrease the speed of the bar segments at an intermediate speed lower than the speed at which the products are supplied. of the bar laminator bar, and the second deceleration means being operable to further decrease the speed of the bar segments of the intermediate speed at a lower speed suitable for supply to the cooling bed; and first and second cooling means separated therebetween along the supply paths with the first cooling means being located above the deceleration means., and the second cooling means being located between the first and second deceleration means, the distance between the first deceleration means and the second cooling means being less than the length of the bar segments. 14. A method for receiving a hot-rolled bar product from a bar rolling mill, and supplying the bar product to a cooling bed, the method comprising: the subdivision of the bar products into bar segments and the direction alternative of the bar segments to one or the other of the two intermediate paths for continuous travel over them; alternatively directing the bar segments traveling along the intermediate paths to one or the other of the two respective supply paths for continuous travel thereon to the cooling bed; and the deceleration of the bar segments that travel along the supply paths. 15. The method as described in claim 14, which further comprises the cooling of the bar segments traveling along the supply paths. 16. - The method as described in claim 14, wherein the bar segments are decelerated in two stages along the supply paths, the first deceleration step operating to decrease the speed of the bar segments to a intermediate speed lower than the speed at which the bar product of the bar laminator is supplied, and operating the second stage of deceleration to further decrease the speed of the bar segments of the intermediate speed * at a lower speed suitable for the supply to the cooling bed. 17. - The method as described in claim 16, characterized in that the second stage of deceleration occurs after the first stage of deceleration has been completed. 8. The method as described in claims 16 or 17, which further comprises the cooling of the bar segments traveling along the supply paths. 19. - The method as described in claim 1 wherein the cooling occurs while the bar segments are going through the deceleration in the first stage. 20. - A method for receiving a hot rolled bar product from a bar rolling mill, and for supplying the bar product to a cooling bed, the method comprising: the subdivision of the bar products into bar segments and the alternative direction of the bar segments to one or the other of the two intermediate paths for continuous travel therein; alternatively directing the bar segments traveling in the intermediate paths to one or the other of the two respective supply paths for continuous travel therein to the cooling bed; and subjecting the bar segments traveling along the supply paths to a two-stage deceleration, the first stage of deceleration being operable to decrease the speed of the bar segments at an intermediate speed lower than the speed at which they are supplied the bar products from the bar rolling mill, and the second deceleration step being operable to further decrease the speed of the bar segments of the intermediate speed at a lower speed suitable for supply to the cooling bed. 21. A method for receiving a hot rolled bar product from a bar mill, and for supplying the bar product to a cooling bed, the method comprising: the subdivision of the bar products into bar segments and the alternative direction of the bar segments to one or the other of the two intermediate trajectories for continuous travel thereon; alternatively direct the bar segments traveling to the Fargo of the intermediate paths to one or the other of the two respective supply paths for continuous travel thereon to the cooling bed; subjecting the bar segments traveling along the supply paths to a two-stage deceleration, the first stage of deceleration being operable to decrease the speed of the bar segments at an intermediate speed lower than the speed at which the bar products of the bar laminator are supplied, and the second deceleration step can be operated to further decrease the speed of the bar segments of the intermediate speed at a lower speed suitable for supply to the cooling bed; and the cooling of the bar segments traveling at the intermediate speed. SUMMARY A method and system for receiving a hot rolled bar product from a bar laminator, and for supplying the bar product to a cooling bed is described. A cutter subdivides the bar product into bar segments and directs alternatively the bar segments to one or the other of the two intermediate descending paths for continuous travel therein. A change in each of the intermediate paths alternately directs the bar segments traveling thereon to one or the other of the two respective down paths for continuous travel thereon to the cooling bed. The decelerators decrease the speed of the bus segments traveling along the supply paths.