CN113492158B - Replaceable roller of cooling bed rolling disc - Google Patents
Replaceable roller of cooling bed rolling disc Download PDFInfo
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- CN113492158B CN113492158B CN202110801437.5A CN202110801437A CN113492158B CN 113492158 B CN113492158 B CN 113492158B CN 202110801437 A CN202110801437 A CN 202110801437A CN 113492158 B CN113492158 B CN 113492158B
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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
- B21B43/08—Cooling beds comprising revolving drums or recycling chains or discs
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Abstract
The invention provides a replaceable roller of a cooling bed rolling disc and application of the replaceable roller in cooling after rolling a medium plate material.
Description
Technical Field
The application relates to the technical field of steel rolling equipment, in particular to a cooling bed rolling disc replaceable roller and application of the cooling bed rolling disc replaceable roller in cooling after rolling of a medium plate.
Background
The cooling bed is one of key equipment of the medium plate mill, the quality of the cooling bed determines whether the surface quality of the plate is qualified, and the structure and the performance of the cooling bed directly influence the final quality and the yield of the product. The rolling disc type cooling bed is adopted by most medium steel plate manufacturers due to the advantages of difficult scratching of the surface of the steel plate, excellent cooling effect, low cost, relatively simple structure, low failure rate, easy maintenance and replacement and the like.
The rolling disc type cooling bed mainly comprises the step of uniformly and naturally cooling a medium steel plate subjected to high-temperature straightening. The material of the rolling disc is ZG20SiMn, and the wear-resisting layer is 10mm. In the production and use process, the steel plate is subjected to high temperature, weight and long-term contact with a rolling disc supporting guide wheel (the guide wheel is ZG 310-570), the rolling disc wear-resisting layer is worn, particularly, when the supporting guide wheel is blocked, abnormal wear occurs on the rolling disc wear-resisting layer, the service cycle of the rolling disc is shortened, the horizontal precision of a cooling bed (the horizontal precision of the cooling bed is 3 mm) is also influenced, a buckling plate appears on the cooling bed with larger horizontal precision loss of the steel plate, the flatness of the steel plate is out of tolerance, and the delivery period of the steel plate is influenced. In the prior art, the roller disc is replaced after parking for maintenance. However, since one rolling disc shaft of such a cooling bed is generally about ten to twenty meters long, a plurality of rolling discs and trays are mounted on one rolling disc shaft, and hundreds of rolling disc shafts are mounted on one cooling bed; when the roller is damaged and replaced, the roller is required to be completely removed from the roller shaft, then a new roller is replaced, the disassembly and the assembly are very difficult, the workload is large, and the production stopping time of the cooling bed is too long due to the replacement of the roller.
Therefore, optimizing and improving the maintenance method of the rolling disc, and shortening the time for disassembling and replacing the rolling disc is necessary for the metallurgical industry.
Disclosure of Invention
An aim of the embodiment of the application is to provide a removable running roller of cold bed rolling dish and application in cooling after the medium plate rolls, through setting up two split semicircle running rollers to with the embedded assembly in the round outside of the rolling dish after processing, utilize the running roller to be different with the thermal expansion coefficient of two different steels of rolling dish, when receiving high temperature to influence the inflation, the rim plate after the assembly produces interference fit in the use, fastening assembly, avoid taking off.
In a first aspect, an embodiment of the present application provides a roller with a replaceable cooling bed roller, where the roller includes two semicircles, and the two semicircles are butted to each other at the outer side of the circumference of the roller; the roller is assembled with the outer side of the circumference of the rolling disc in an embedded mode or in a plane mode.
In the realization process, the rolling disc can deform or change in size after being worn for a long time, and after the original rolling disc is simply processed, a replaceable roller is provided and assembled with the outer side of the circumference of the rolling disc in an embedded mode or assembled in a plane mode, so that the whole rolling disc does not need to be replaced completely, and the cost is saved.
The roller is divided into two semicircular rollers, two ends of the two semicircular rollers are butted with each other in a lap joint or embedding mode, so that the roller is complete, and the roller is not required to be detached from the roller shaft in the process of repairing the roller in a separable and assemblable mode, only the roller is required to be sleeved on the outer side of the periphery of the roller, and then the roller is fastened and assembled, so that the maintenance efficiency is greatly improved.
In the implementation process, before assembly, the outer side of the circumference of the rolling disc needs to be processed, and the purpose of processing is to facilitate the assembly of the roller. Theoretically, the outer circumferential side of the rolling disc is machined according to the shape and size of the fitting contact surface. Alternatively, it may be smooth, planar, or non-smooth. For example, the mode of overlap joint, the mode of buckle, the embedding mode, mortise and tenon contact mode, as long as can the tight fit, have sufficient intensity in the later stage use, not hard up can.
Further, the coefficient of thermal expansion of the roller plate is greater than the coefficient of thermal expansion of the roller.
In the implementation process, the two different steel thermal expansion coefficients of the roller and the rolling disc are utilized, when the roller and the rolling disc are expanded under the influence of high temperature, the assembled wheel disc generates interference fit in the use process, and the assembled wheel disc is fastened and assembled, so that loosening is avoided. The contact with the wheel disc is the medium plate waiting to be cooled at high temperature, and the working states of the rolling disc and the roller are always at high temperature through heat conduction and heat radiation, so that the medium plate is kept in a natural air cooling state. Because running roller with the embedded assembly in circumference outside of rolling dish or plane assembly, in the contact surface, under the general circumstances, the circumference outside of running roller cladding rolling dish is including the circumference outside of rolling dish, and the running roller is outside, when thermal expansion, because the coefficient of thermal expansion of two steels is different, the deformation is great after the rolling dish inflation, and the deformation is little after the running roller inflation, like this, the assembly contact surface can produce interference fit, avoids the pine to take off.
Preferably, the roller is ZG20SiMn, and the rolling disc is 45 steel.
In the implementation process, the materials of the roller and the rolling disc are selected. The chemical composition of ZG20SiMn is C: (0.12-0.22 wt%), si: (0.60-0.80), mn: (1.00-1.30), P: (. Ltoreq.0.035), S: (. Ltoreq.0.035), ni: (. Ltoreq.0.40). The ZG20SiMn cast steel has good casting performance and welding performance. The casting material is generally used for casting large-section thick-wall heavy castings, such as large stand columns of hydraulic presses, working cylinders, turbine wheels, blades, power station spindles, flanges, seat rings and the like, and is applicable to all high-toughness easy-to-weld steel castings. The tensile fracture of the sample after the positive tempering treatment always presents a stone fracture with lower plasticity and toughness, and the problem can be solved only by strictly controlling the quality of furnace burden and deoxidizing with ferrotitanium after the furnace. The ZG20SiMn cast structure is pearlite and ferrite, the widmannstatten structure is easy to appear after normalizing, and when the sand sticking of the casting is serious, the high-temperature (1100 ℃) diffusion annealing can be carried out for a time in order to facilitate sand cleaning.
The 45 steel is high-quality carbon structural steel, and has higher strength and deformation resistance compared with common steel. The chemical composition of 45 steel is C: (0.42 to 0.50 wt%); cr: (. Ltoreq.0.25); mn: (0.50 to 0.80); ni: (. Ltoreq.0.25); p: (. Ltoreq.0.035); s: (. Ltoreq.0.035); si: (0.17-0.37). The No. 45 steel is medium carbon structural steel, has good cold and hot workability, good mechanical property, low price and wide source, and is widely applied.
Further, the thickness of the wear-resistant layer of the roller is 15-20mm;
in the implementation process, the thickness of the wear-resistant layer of the traditional rolling disc is generally 10mm, and after a period of use, the rolling disc is in direct contact and operates with a rigid guide wheel supported below at a high-temperature medium plate for a long time, so that abrasion and gradual degradation occur. In this scheme, because the running roller can be changed, the running roller is as a consumable layer, directly makes 15-20mm with wear-resisting layer thickness, just so can prolong the time of nai loss, avoid often changing the influence operating mode.
Preferably, the wear-resistant layer of the roller is annealed.
In the implementation process, the ZG20SiMn cast structure is pearlite and ferrite, the widmannstatten structure is easy to appear after normalizing, and when the sand sticking of the casting is serious, the high-temperature (1100 ℃) diffusion annealing can be carried out for a time in order to facilitate the sand cleaning.
Further, the size of the processing surface of the rolling disc is matched with the size of the roller.
In the above implementation process, because the roller and the roller are assembled in an embedded manner or assembled in a plane, for convenience and high efficiency of assembly, the assembly surface of the roller needs to be processed, and the size of the processing surface is matched with the size of the roller.
Further, screw holes are formed in a position 20mm away from the circumference of the roller in a diagonal center line mode, and the roller and the rolling disc are fastened and assembled through the screw holes;
in the realization process, the thickness of the wear-resistant layer of the roller is 15-20mm, and in order to avoid damaging the wear-resistant layer, the roller and the rolling disc are fastened and assembled at the same time, the roller and the rolling disc are required to be connected through bolts and nuts. Typically, the screw holes are machined diagonally at a position 20mm from the circumference of the roller, so that the strength of the connection is maintained without damaging the wear layer. The depth of the screw hole is determined according to the requirement and is generally 60-80mm.
Preferably, the number of the screw holes is 4-8, and the aperture of the screw holes is 16+/-0.5;
further, a high-temperature-resistant bolt and a self-locking nut are adopted for fastening assembly;
preferably, countersunk bolts or hexagon socket bolts are adopted for fastening and assembling with screws;
preferably, the assembly contact surface is a smooth surface, a frosted surface or a textured surface.
In the implementation process, the screw holes are required to be symmetrically arranged and uniformly distributed on the circumference of 360 degrees. Because the wheel disc runs at high temperature, high-temperature resistant bolts and nuts are needed, and self-locking nuts are adopted to avoid looseness in the running process. In order to avoid the excessive length of the bolt and the nut extending out of the wheel disc, a countersunk bolt is adopted, and in theory, the countersunk bolt can be used as long as the countersunk bolt can avoid interference during operation.
In the implementation process, the assembly surface is suitable for assembly, and can be adjusted in real time according to the requirements of the assembly surface of the rolling disc and the roller.
Further, a plurality of lightening holes are uniformly formed in the rolling disc;
in the implementation process, because the rolling disc is heavier, in order to reduce the weight of the rolling disc, on the premise of not affecting the functions and the strength, a plurality of lightening holes are formed in the rolling disc body, and the lightening holes are uniformly arranged and arrayed into a circular ring along the circumferential direction. Because the material of rolling disc and running roller is different, thermal expansion coefficient is different, when expanding under high temperature, need the space of inflation, set up the lightening hole on the rolling disc and also can provide the space of deformation under the rolling disc inflation simultaneously.
Preferably, the number of the lightening holes is 4-8.
Further, the two semicircular rollers are mutually butted in a lap joint or embedding mode;
preferably, the butt joint contact surface in the lap joint mode is a circumferential cambered surface and a radial plane;
preferably, the butt-joint contact surface is a smooth surface, a frosted surface or a textured surface;
preferably, the mutual butt joint adopts a clamping plate and/or a clamping groove.
In the implementation process, two ends of the semicircle of the two semicircle rollers are mutually butted, a whole circle is assembled on the outer side of the circumference of the rolling disc after the butt joint, in order to maintain a whole circle and also in order to realize the butt joint locking, the two ends of the semicircle are connected in a lap joint or embedded mode, alternatively, the two ends of the semicircle are mutually butted through a clamping plate or a clamping groove, and countersunk bolts can be added for fastening. Theoretically, a connection manner that can connect and fasten and avoid interference is sufficient.
In the realization process, the semicircular two ends of the two semicircular rollers are mutually butted and are mutually lapped on the circumference cambered surface, then, in the running process of the wheel disc, the high-temperature environment and the normal-temperature environment are alternately arranged, the heat expansion and the cold contraction and the mutual friction of all contact surfaces are realized, the generated ferric oxide powder falls into the junction of the surface layers of the two semicircular rollers, at this time, except the lap joint of the circumference cambered surface, the radial planar butting mode is simultaneously arranged at the two ends of the semicircle, thus, the phenomenon that the side surface of the wheel disc falls into the ferric oxide powder can be avoided, the gap of the junction is increased, the abnormal abrasion of the wheel disc occurs when the wheel disc is used, and the service cycle is shortened.
Further, the roller specification is matched with the supported guide wheel specification.
In the implementation process, the wheel disc can be in direct contact with the guide wheel in the operation process, so that the specification of the roller is required to be matched with the specification of the supported guide wheel, and the tilting in the operation process can be avoided.
In a second aspect, an embodiment of the present application provides an application of the above replaceable roller in cooling after rolling a medium plate, which avoids difficulty in disassembly and overlong replacement time after grinding of the roller, and also saves maintenance cost.
By providing two split semicircular rollers, the rollers can be assembled in an embedded mode or assembled on the outer side of the circumference of the roller on the plane on the basis of keeping the original roller, and the roller is quite convenient to replace.
The beneficial effects are that:
in the implementation process, the invention provides a replaceable roller of a cooling bed roller and application of the replaceable roller in cooling after rolling a medium plate, and the split two semicircular rollers are arranged, are assembled with the outer side of the periphery of the processed roller in an embedded mode or in a plane mode, and the roller are utilized to have different thermal expansion coefficients of two different steels, so that when the roller and the roller are expanded under the influence of high temperature, the assembled wheel disc is in interference fit in the use process, and is fastened and assembled, so that loosening is avoided.
After the wear-resistant layer of the roller is worn for a long time, the two semicircular rollers can be taken down after the fastening bolts and nuts are conveniently removed, and new rollers are replaced, so that the roller is convenient and quick to replace, and the roller is not required to be lifted out for disassembly and replacement during assembly and replacement, thereby saving the maintenance time and improving the operation efficiency;
the split type two semicircular rollers are used for separating the original integrated rolling disc, the original rolling disc is reserved, only the abrasion roller is needed to be replaced, and from the aspect of spare part cost, larger expenditure caused by the abrasion replacement of the rolling disc can be saved, and the maintenance cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an assembled roller and a rolling disc according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of overlapping of circumferential arc surfaces of a semicircular roller according to an embodiment of the present application.
Fig. 3 is a right side view of the semicircular roller on the left side in fig. 2 provided in the embodiment of the present application.
Fig. 4 is a left side view of the right semicircular roller of fig. 2 provided in an embodiment of the present application.
FIG. 5 (a) is a front view of section A-A of FIG. 1 provided in an embodiment of the present application; fig. 5 (b) is another view of the front view of section A-A of fig. 1 provided in an embodiment of the present application.
Wherein, each reference sign is 1-roller; 2-rolling a disc; 3-screw holes; 4-lightening holes; 5-a circumferential cambered surface; 6-radial plane.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Accordingly, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships that are conventionally put in use of the product of the application, are merely for convenience of description of the present application and simplification of description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Examples
Referring to fig. 1, the present embodiment provides a replaceable roller of a cooling bed roller, which is characterized in that the roller 1 includes two semicircles, the two semicircles are butted to each other at the outer side of the circumference of the roller 2, and the two semicircles are butted to each other, so that fig. 2 can be seen; two ends of the two semicircular rollers are respectively provided with a clamping plate and a clamping groove, and the two semicircular rollers can be connected into a finished circle in a seamless manner through the clamping plates and the clamping grooves.
In fact, the two semicircular rollers overlap each other through the circumferential arc 5 and the radial plane 6. In the realization process, the two ends of the semicircle of the two semicircle rollers are mutually butted and mutually lapped on the circumference cambered surface 5, then, in the running process of the wheel disc, the high-temperature environment and the normal-temperature environment are alternately in thermal expansion and contraction and the mutual friction of each contact surface, the generated ferric oxide powder falls into the junction of the surface layers of the two semicircle rollers, at this time, except the lap joint of the circumference cambered surface, the butt joint mode of the radial plane 6 is simultaneously arranged at the two ends of the semicircle rollers, thus, the phenomenon that the side surface of the wheel disc falls into the ferric oxide powder can be avoided, the gap at the junction is increased, the abnormal abrasion of the wheel disc occurs when the wheel disc is used, and the service cycle is shortened.
The roller 1 is fitted with an insert or flat fitting on the outside of the circumference of the drum 2, see fig. 5 (b), and the flat fitting is shown in fig. 5 (a). The roller 1 is coated on the outer side of the circumference of the roller 2, the roller 2 is assembled with the roller 1 after being processed on the outer side of the circumference of the roller 2, and the outer side of the circumference of the roller 2 is embedded on the roller 1, which is similar to a coating sleeve on a steering wheel.
The coefficient of thermal expansion of the platen 2 is greater than the coefficient of thermal expansion of the roller 1. The material of the roller 1 is ZG20SiMn, and the material of the rolling disc 2 is 45 steel.
The thickness of the wear-resistant layer of the roller 1 is 15-20mm; the wear-resistant layer of the roller 1 is annealed.
The size of the processing surface of the rolling disc 2 is matched with the size of the roller 1. Machining screw holes 3 in a diagonal center line manner at a position 20mm away from the circumference of the roller 1, and fastening and assembling the roller 1 and the roller disc 2 through the screw holes 3; preferably, the number of the screw holes 3 is 4-8, and the aperture of the screw holes 3 is 16+/-0.5; preferably, the high temperature resistant bolt and the self-locking nut are adopted for fastening assembly;
preferably, countersunk bolts or hexagon socket bolts are adopted for fastening and assembling with screws;
preferably, the assembly contact surface is a smooth surface, a frosted surface or a textured surface.
A plurality of lightening holes 4 are uniformly formed in the rolling disc 2;
preferably, the number of the lightening holes 4 is 4-8.
The two semicircular rollers are mutually butted in a lap joint or embedding mode; preferably, the butt-joint contact surface is a smooth surface, a frosted surface or a textured surface; preferably, the mutual butt joint adopts a clamping plate and/or a clamping groove.
The specification of the roller is matched with that of the supporting guide wheel. After the rolling disc 2 is worn for a long time, the rolling disc can deform or change in size, after the original rolling disc is simply processed, a replaceable roller 1 is provided, and the replaceable roller is assembled with the outer side of the circumference of the rolling disc 2 in an embedded mode or in a plane mode, so that the whole rolling disc 2 does not need to be replaced completely, and the cost is saved.
The roller 1 is divided into two semicircular rollers, two ends of the two semicircular rollers are butted with each other in a lap joint or embedding mode, so that the roller is a complete roller, and the roller 2 is not required to be detached from the roller shaft in the repairing process of the roller 2 in a separable and assemblable mode, only the roller is required to be sleeved on the outer side of the periphery of the roller, and then the roller is fastened and assembled, so that the maintenance efficiency is greatly improved.
In the above implementation, before assembly, the outer side of the circumference of the rolling disc 2 needs to be machined, and the machining purpose is to facilitate the assembly of the roller 1. Theoretically, the outer circumferential side of the rolling disc is machined according to the shape and size of the fitting contact surface. Alternatively, it may be smooth, planar, or non-smooth. For example, the mode of overlap joint, the mode of buckle, the embedding mode, mortise and tenon contact mode, as long as can the tight fit, have sufficient intensity in the later stage use, not hard up can.
In the implementation process, the two different steel thermal expansion coefficients of the roller 1 and the roller 2 are utilized, when the roller is expanded under the influence of high temperature, the assembled wheel disc generates interference fit in the use process, and the roller disc is fastened and assembled, so that loosening is avoided. The working states of the rolling disc 2 and the roller 1 are constantly at high temperature through heat conduction because the upper surface of the wheel disc is the double-length medium plate waiting for cooling at high temperature, except when natural air cooling is achieved. Because running roller 1 with the embedded assembly in circumference outside of rolling dish 2 or plane assembly, in the contact surface, under the general circumstances, the circumference outside of running roller 1 cladding rolling dish 2, namely the circumference outside of rolling dish 2 is including, running roller 1 is outside, when thermal expansion, because the coefficient of thermal expansion of two steels is different, the deformation is great after the rolling dish 2 expands, and the deformation is little slightly after the running roller 1 expands, like this, the assembly contact surface can produce interference fit, avoids the pine to take off. And through embedded assembly, can effectually avoid high temperature steel sheet lower surface, the ferric oxide powder that produces when expend with heat and contract with cold falls into two rim plate surface layer junctions, avoids the rim plate side to fall into ferric oxide powder, makes junction clearance increase, leads to the rim plate to appear abnormal wearing and tearing when using, shortens life cycle.
In the implementation process, the materials of the roller and the rolling disc are selected. The chemical composition of ZG20SiMn is C: (0.12-0.22 wt%), si: (0.60-0.80), mn: (1.00-1.30), P: (. Ltoreq.0.035), S: (. Ltoreq.0.035), ni: (. Ltoreq.0.40). The ZG20SiMn cast steel has good casting performance and welding performance. The casting material is generally used for casting large-section thick-wall heavy castings, such as large stand columns of hydraulic presses, working cylinders, turbine wheels, blades, power station spindles, flanges, seat rings and the like, and is applicable to all high-toughness easy-to-weld steel castings. The tensile fracture of the sample after the positive tempering treatment always presents a stone fracture with lower plasticity and toughness, and the problem can be solved only by strictly controlling the quality of furnace burden and deoxidizing with ferrotitanium after the furnace. The ZG20SiMn cast structure is pearlite and ferrite, the widmannstatten structure is easy to appear after normalizing, and when the sand sticking of the casting is serious, the high-temperature (1100 ℃) diffusion annealing can be carried out for a time in order to facilitate sand cleaning.
The 45 steel is high-quality carbon structural steel, and has higher strength and deformation resistance compared with common steel. The chemical composition of 45 steel is C: (0.42 to 0.50 wt%); cr: (. Ltoreq.0.25); mn: (0.50 to 0.80); ni: (. Ltoreq.0.25); p: (. Ltoreq.0.035); s: (. Ltoreq.0.035); si: (0.17-0.37). The No. 45 steel is medium carbon structural steel, has good cold and hot workability, good mechanical property, low price and wide source, and is widely applied.
In the above implementation process, the wear-resistant layer of the conventional rolling disc 2 is generally 10mm, and after a period of use, the wear is serious due to direct contact with a multiple of length or a guide wheel. In this scheme, because running roller 1 can be changed, running roller 1 is as a consumptive material, directly makes 15-20mm with wear-resisting layer thickness, just so can prolong the time of nai loss, avoid often changing the influence operating mode.
In the implementation process, the ZG20SiMn cast structure is pearlite and ferrite, the widmannstatten structure is easy to appear after normalizing, and when the sand sticking of the casting is serious, the high-temperature (1100 ℃) diffusion annealing can be carried out for a time in order to facilitate the sand cleaning.
In the above implementation process, because the roller 1 and the roller 2 are assembled in an embedded manner or in a plane, for convenience and high efficiency of assembly, the assembly surface of the roller 2 needs to be processed, and the size of the processing surface is adapted to the size of the roller 1.
Further, screw holes 3 are formed in a diagonal center line manner at a position 20mm away from the circumference of the roller 1, and the roller 1 and the roller plate 2 are fastened and assembled through the screw holes 3;
in the above-mentioned realization, the wear-resistant layer thickness of the roller 1 is 15-20mm, and in order to avoid damaging the wear-resistant layer, and in order to fasten the roller 1 and the rolling disc 2, the connection needs to be performed through bolts and nuts. Typically, the screw holes 3 are machined diagonally at a position 20mm from the circumference of the roller 1, so that the connection strength is maintained without breaking the wear-resistant layer. The depth of the screw hole 3 is determined according to the requirement and is generally 60-80mm.
In the implementation process, the screw holes 3 are arranged in consideration of thermal expansion of the high-temperature contact and heat radiation of the medium plate at the joint of the wheel disc, so that the gap at the joint is increased, and the corresponding distance between the holes close to the joint of the wheel disc on the circumference of 360 degrees is 120mm; the rest screw holes are horizontally and symmetrically distributed at the center point.
Because the wheel disc runs at high temperature, high-temperature resistant bolts and nuts are needed, and self-locking nuts are adopted to avoid looseness in the running process. In order to avoid the excessive length of the bolt and the nut extending out of the wheel disc, a countersunk bolt is adopted, and in theory, the countersunk bolt can be used as long as the countersunk bolt can avoid interference during operation.
In the implementation process, the assembly surface is suitable for assembly, and can be adjusted in real time according to the requirements of the assembly surfaces of the rolling disc 2 and the roller 1.
A plurality of lightening holes 4 are uniformly formed in the rolling disc 2. In the above implementation process, since the rolling disc is heavy, in order to reduce the weight of the rolling disc, on the premise of not affecting the function and strength, the rolling disc 2 body is provided with a plurality of lightening holes 4, and the lightening holes 4 are uniformly arranged and arrayed in a circular ring along the circumferential direction. Because the material of the rolling disc 2 is different from that of the roller 1, the thermal expansion coefficients are different, when the rolling disc 2 expands at high temperature, the expansion space is needed, and the weight reducing holes 4 are formed in the rolling disc 2 and the deformation space under the expansion of the rolling disc 2 can be provided.
The two semicircular rollers are mutually butted in a lap joint or embedding mode; preferably, the butt joint contact surface in the lap joint mode is a circumferential cambered surface and a radial plane; preferably, the butt-joint contact surface is a smooth surface, a frosted surface or a textured surface; preferably, the mutual butt joint adopts a clamping plate and/or a clamping groove.
In the implementation process, two ends of the semicircle of the two semicircle rollers are mutually butted, a whole circle is assembled on the outer side of the circumference of the rolling disc after the butt joint, in order to maintain a whole circle and also in order to realize the butt joint locking, the two ends of the semicircle are connected in a lap joint or embedded mode, alternatively, the two ends of the semicircle are mutually butted through a clamping plate or a clamping groove, and countersunk bolts can be added for fastening. Theoretically, a connection manner that can connect and fasten and avoid interference is sufficient.
The specification of the roller is matched with that of the supporting guide wheel. In the implementation process, the wheel disc can be in direct contact with the guide wheel in the operation process, so that the specification of the roller is required to be matched with the specification of the supported guide wheel, and the tilting in the operation process can be avoided.
In a second aspect, an embodiment of the present application provides an application of the above replaceable roller in cooling after rolling a medium plate, which avoids difficulty in disassembly and overlong replacement time after grinding of the roller, and also saves maintenance cost.
By providing two split semicircular rollers, the rollers can be assembled in an embedded mode or assembled on the outer side of the circumference of the roller on the plane on the basis of keeping the original roller, and the roller is quite convenient to replace.
The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, and various modifications and variations may be suggested to one skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (7)
1. A replaceable roller of a cooling bed rolling disc is characterized in that,
the roller (1) comprises two semicircles, and the two semicircles are mutually butted at the outer side of the circumference of the rolling disc (2);
the roller (1) is assembled with the outer side of the circumference of the rolling disc (2) in an embedded mode or in a plane mode; the thermal expansion coefficient of the rolling disc is larger than that of the roller; the roller is made of ZG20SiMn, and the rolling disc is made of 45 steel; screw holes (3) are machined at positions 20mm away from the circumference of the roller in a diagonal center line mode, and the roller and the rolling disc are fastened and assembled through the screw holes;
the two semicircular rollers are mutually butted in a lap joint and embedding mode;
the butt joint contact surface of the lap joint mode is a circumferential cambered surface and a radial plane; the two semicircular rollers are mutually overlapped through the circumferential cambered surface and the radial plane, the two semicircular ends of the two semicircular rollers are mutually overlapped on the circumferential cambered surface, and in the running process of the wheel disc, the two semicircular rollers are in alternation in a high-temperature environment and a normal-temperature environment, the heat expansion and the cold contraction and the mutual friction of all contact surfaces, and the generated ferric oxide powder falls into the junction of the surface layers of the two semicircular rollers, at the moment, besides the overlapping of the circumferential cambered surface, the two ends of the semicircular rollers are provided with the radial plane abutting mode, so that the side surface of the wheel disc can be prevented from falling into the ferric oxide powder;
the butt joint contact surface is a smooth surface, a frosted surface or a textured surface;
the mutual butt joint adopts a clamping plate and a clamping groove;
4-8 lightening holes are uniformly formed in the rolling disc.
2. The roller according to claim 1, wherein the wear layer of the roller has a thickness of 15-20mm;
and the wear-resistant layer of the roller is annealed.
3. The roller of claim 1, wherein the size of the working surface of the platen is adapted to the size of the roller.
4. A roller according to claim 1, wherein,
the number of the screw holes is 4-8, and the aperture of the screw holes is 16+/-0.5.
5. The roller according to claim 4, wherein the tightening assembly is performed by using a high temperature resistant bolt and a self-locking nut;
the assembly contact surface is a smooth surface, a frosted surface or a textured surface.
6. The roller of claim 1, wherein the roller gauge is adapted to a gauge of a supported guide wheel.
7. Use of a roller according to any one of claims 1-6 for cooling after rolling of a medium plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110801437.5A CN113492158B (en) | 2021-07-15 | 2021-07-15 | Replaceable roller of cooling bed rolling disc |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110801437.5A CN113492158B (en) | 2021-07-15 | 2021-07-15 | Replaceable roller of cooling bed rolling disc |
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| CN113492158A CN113492158A (en) | 2021-10-12 |
| CN113492158B true CN113492158B (en) | 2023-05-30 |
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| JPH09253810A (en) * | 1996-01-18 | 1997-09-30 | Nippon Steel Corp | Roll for carrying in continuous casting apparatus |
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| JP2008221221A (en) * | 2007-03-08 | 2008-09-25 | Hitachi Metals Ltd | Ceramic roll |
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| US5908102A (en) * | 1996-12-18 | 1999-06-01 | Plesh, Sr.; Ronald L. | High capacity and easy to maintain insert for cooling bed plate transfer grid |
| CN200948471Y (en) * | 2006-07-20 | 2007-09-19 | 邯郸钢铁股份有限公司 | Cold bed rolling plate convenient to disassembly |
| CN203955731U (en) * | 2014-03-31 | 2014-11-26 | 北京明诚技术开发有限公司 | Cold bed rolling disk |
| CN204381080U (en) * | 2014-12-26 | 2015-06-10 | 南阳汉冶特钢有限公司 | A kind of novel cold bed rolling disk |
| CN112744387A (en) * | 2020-05-22 | 2021-05-04 | 蓬莱市超硬复合材料有限公司 | Hard alloy combined roller locking device |
| CN213409844U (en) * | 2020-06-22 | 2021-06-11 | 泰尔(安徽)工业科技服务有限公司 | Novel cooling bed tray |
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|---|---|---|---|---|
| JPH09253810A (en) * | 1996-01-18 | 1997-09-30 | Nippon Steel Corp | Roll for carrying in continuous casting apparatus |
| JP2008221221A (en) * | 2007-03-08 | 2008-09-25 | Hitachi Metals Ltd | Ceramic roll |
| CN101074756A (en) * | 2007-06-16 | 2007-11-21 | 赵衍芝 | Pipeline leakage-compensated structural member |
| CN202845473U (en) * | 2012-09-27 | 2013-04-03 | 何振山 | Modified driving roller of steel rolling cold bed entry table |
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| CN113492158A (en) | 2021-10-12 |
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