Tempering furnace and tempering control method

Abstract

The present application relates to the technical field of steel rolling equipment, and discloses a tempering furnace and a tempering control method, wherein the tempering furnace comprises a furnace body and a conveying track, wherein the conveying track comprises an inlet roller, a tempering roller and an outlet roller arranged in sequence along a first direction; the inlet roller is arranged at the inlet of the furnace body and is used to convey the workpiece to the tempering roller along the first direction, and the outlet roller is arranged at the outlet of the furnace body and is used to convey the workpiece transferred from the tempering roller; the inlet roller, the tempering roller and the outlet roller all comprise a plurality of furnace rollers, and at least one of the plurality of furnace rollers is connected to the furnace body in a liftable manner along a second direction, and the second direction is perpendicular to the first direction. The above-mentioned tempering furnace can ensure that the workpiece enters the furnace smoothly, and can also be assisted by liftable furnace rollers to achieve thermal straightening or straightening of the workpiece, thereby eliminating various residual stresses of the workpiece during quenching and tempering.

Description

Technical Field

[0001] The present application relates to the technical field of steel rolling equipment, and in particular to a tempering furnace and a tempering control method. Background Art

[0002] With the application of NG-TMCP technology in hot rolling production lines, the strength of steel plates has been greatly improved. As "lightweight" technology is popular in various industries, it can save fuel, energy, and alloy, and is green, environmentally friendly, and low-carbon. Thin-gauge wear-resistant steel plates are also widely used in engineering machinery. However, it is difficult to ensure the shape of wear-resistant steel plates with a thickness of 2mm or less during production, so they are called extreme specifications, which brings great difficulties to production. Among them, thin-gauge wear-resistant steel plates are prone to severe deformation after quenching and cannot enter the tempering furnace. In addition, thin-gauge wear-resistant steel plates will produce various residual stresses during quenching or tempering, which makes it difficult for the plate shape of the steel plate to meet the delivery technical requirements after tempering. Summary of the invention

[0003] The purpose of the present application is to provide a tempering furnace and a tempering control method, which are used to solve the technical problems that thin-gauge wear-resistant steel plates are severely deformed after quenching and cannot enter the tempering furnace, and the plate shape of the thin-gauge wear-resistant steel plates after tempering does not meet the technical requirements.

[0004] To solve the above problems, in a first aspect, the present application provides a tempering furnace for tempering a workpiece, wherein the workpiece is a thin-gauge wear-resistant steel plate with a thickness less than or equal to 2 mm, the tempering furnace comprising a furnace body and a conveying track, wherein the conveying track comprises an inlet roller, a tempering roller and an outlet roller arranged in sequence along a first direction;

[0005] The furnace entry roller is arranged at the entrance of the furnace body and is used to transport the workpiece to the tempering roller along the first direction, and the furnace exit roller is arranged at the exit of the furnace body and is used to transport the workpiece transferred from the tempering roller;

[0006] The furnace entry roller, the tempering roller and the furnace exit roller all include a plurality of furnace rollers, and at least one of the plurality of furnace rollers is connected to the furnace body in a liftable manner along a second direction, and the second direction is perpendicular to the first direction.

[0007] In one embodiment, the furnace entry roller comprises an upper furnace entry roller and a lower furnace entry roller, the upper furnace entry roller and the lower furnace entry roller are arranged opposite to each other and at intervals along the second direction, the furnace roller of the lower furnace entry roller can be raised and lowered connected to the furnace body, and the furnace roller of the upper furnace entry roller is fixedly connected to the furnace body; the furnace rollers of the upper furnace entry roller and the lower furnace entry roller correspond to each other one by one.

[0008] In one embodiment, the tempering roller comprises a first roller, a second roller and a third roller arranged in sequence along the first direction, the first roller is used to preheat the workpiece, the second roller is used to heat the workpiece, and the third roller is used to level the workpiece;

[0009] Resistance wires are arranged inside the furnace rollers of the first roller, the second roller and the third roller.

[0010] In one embodiment, the first roller comprises a first upper roller and a first lower roller, the first upper roller and the first lower roller are arranged opposite to each other and spaced apart along the second direction, the furnace roller of the first lower roller is liftably connected to the furnace body, and the furnace roller of the first upper roller is fixedly connected to the furnace body; the furnace rollers of the first upper roller and the first lower roller correspond to each other one by one.

[0011] In one embodiment, the second roller table includes a second upper roller, a second middle roller and a second lower roller, the second upper roller, the second middle roller and the second lower roller are spaced apart along the second direction, the furnace roller of the second middle roller is fixedly connected to the furnace body, and the furnace rollers of the second upper roller and the second lower roller can be lifted and lowered to the furnace body.

[0012] In one embodiment, the furnace rolls of the second upper roll, the second middle roll and the second lower roll are staggered in the first direction.

[0013] In one embodiment, the third roller table comprises a third upper roller and a third lower roller, the third upper roller and the third lower roller are arranged opposite to each other and spaced apart along the second direction, the furnace roller of the third upper roller is liftably connected to the furnace body, and the furnace rollers of the third upper roller and the third lower roller correspond to each other one by one;

[0014] The furnace roller table includes an upper furnace roller and a lower furnace roller, the upper furnace roller and the lower furnace roller are arranged opposite to each other and at intervals along the second direction, the furnace rollers of the upper furnace roller can be raised and lowered and connected to the furnace body, and the furnace rollers of the upper furnace roller and the lower furnace roller correspond to each other one by one.

[0015] In one embodiment, the furnace roller of the third lower roller and the furnace roller of the furnace-out lower roller are respectively fixedly connected to the furnace body;

[0016] Alternatively, the furnace roller of the third lower roller and the furnace roller of the furnace-exiting lower roller can be connected to the furnace body in a liftable manner.

[0017] The above-mentioned tempering furnace includes a furnace body and a conveying track, and the conveying track includes an entry roller, a tempering roller and an exit roller which are arranged in sequence along a first direction. Since the entry roller, the tempering roller and the exit roller include furnace rollers which are liftably connected to the furnace body along a second direction, the relative positions of the furnace rollers in the furnace body can be changed, thereby driving the relative positions of the workpieces on the furnace rollers to change, which can not only ensure that the workpieces enter the furnace smoothly, but also can achieve thermal correction or straightening of the workpieces with the assistance of the liftable furnace rollers, thereby eliminating various residual stresses of the workpieces during the quenching and tempering processes, and ensuring that the plate shape of the steel plate meets the delivery technical requirements after tempering.

[0018] An embodiment of the second aspect of the present application provides a tempering control method, using the tempering furnace as described in any embodiment of the first aspect, and the tempering control method includes:

[0019] Placing the workpiece on the furnace entry roller of the tempering furnace, and conveying the workpiece to the first roller through the furnace entry roller;

[0020] heating the workpiece to a first temperature by using the first roller conveyor, and conveying the workpiece to a second roller conveyor;

[0021] Using the second roller to heat the workpiece to a second temperature, and simultaneously heat-correcting the workpiece, wherein the second temperature is greater than the first temperature, and transporting the workpiece to a third roller via the second roller;

[0022] Using the third roller to heat the workpiece so that the workpiece maintains the second temperature for a preset time, flattening the workpiece, and conveying the workpiece to a furnace-out roller via the third roller;

[0023] The workpiece is leveled by the furnace discharge roller and discharged outward from the furnace body outlet.

[0024] In one embodiment, the furnace entry roller comprises an upper furnace entry roller and a lower furnace entry roller, the upper furnace entry roller and the lower furnace entry roller are arranged opposite to each other and spaced apart along the second direction, and placing the workpiece on the furnace entry roller of the tempering furnace comprises:

[0025] Placing one end of the workpiece on the lower roller for entering the furnace;

[0026] The furnace roller of the lower furnace roller rises at a target time, the target time is inversely proportional to the rotation speed of the furnace roller, and the target time is proportional to the distance between adjacent furnace rollers.

[0027] The above-mentioned tempering control method drives the relative position of the workpiece on the furnace roller to change by means of the furnace roller which is liftably connected to the furnace body, which not only ensures that the workpiece enters the furnace smoothly, but also can realize the thermal correction or straightening of the workpiece with the assistance of the furnace roller in different tempering sections, thereby eliminating various residual stresses of the workpiece during the quenching and tempering process, and ensuring that the plate shape of the steel plate meets the technical requirements for delivery after tempering, thereby solving the technical problems that the thin-gauge wear-resistant steel plate is severely deformed after quenching and cannot enter the tempering furnace, and the plate shape of the thin-gauge wear-resistant steel plate does not meet the technical requirements after tempering. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the structure of a tempering furnace provided in one embodiment of the present application;

[0030] Figure 2 A schematic diagram of the structure of a tempering furnace provided in another embodiment of the present application;

[0031] Figure 3 A flowchart of a tempering control method provided in one embodiment of the present application.

[0032] Description of main component symbols:

[0033] 100, tempering furnace; 200, workpiece;

[0034] 10. Furnace body;

[0035] 20. Roller for entering the furnace; 21. Upper roller for entering the furnace; 22. Lower roller for entering the furnace

[0036] 30, tempering roller; 301, preheating zone; 302, heating zone; 303, flattening zone; 31, first roller; 311, first upper roller; 312, first lower roller; 32, second roller; 321, second upper roller; 322, second middle roller; 323, second lower roller; 33, third roller; 331, third upper roller; 332, third lower roller;

[0037] 40. Out-of-furnace roller; 41. Out-of-furnace upper roller; 42. Out-of-furnace lower roller;

[0038] 50. Resistance wire;

[0039] 60. Linear drive element;

[0040] 70. Support. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the patent. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0043] References to "one embodiment", "some embodiments" or "an embodiment" described in the specification of this application mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some other embodiments", "in some other embodiments", etc., which appear at different places in this specification, do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. In addition, in one or more embodiments, particular features, structures or characteristics may be combined in any suitable manner.

[0044] On the first aspect, an embodiment of the first aspect of the present application proposes a tempering furnace for tempering a workpiece, wherein the workpiece is a thin-gauge wear-resistant steel plate with a thickness less than or equal to 2 mm, so as to eliminate residual stress in the workpiece after quenching and flatten the workpiece to ensure that the plate shape of the workpiece after tempering meets the technical requirements for delivery.

[0045] Please refer to Figure 1 In one embodiment of the present application, the tempering furnace 100 includes a furnace body 10 and a conveying track, and the conveying track includes an inlet roller 20, a tempering roller 30 and an outlet roller 40 sequentially arranged along a first direction.

[0046] The inlet roller 20 is disposed at the entrance of the furnace body 10 and is used to transport the workpiece 200 to the tempering roller 30 along a first direction (X direction in the figure). The outlet roller 40 is disposed at the exit of the furnace body 10 and is used to transport the workpiece 200 rotated out of the tempering roller 30.

[0047] The furnace entry roller table 20, the tempering roller table 30 and the furnace exit roller table 40 all include a plurality of furnace rollers, and at least one of the plurality of furnace rollers is connected to the furnace body 10 in a manner that it can be raised and lowered along a second direction (Z direction in the figure), and the second direction is perpendicular to the first direction. Due to the existence of the furnace rollers that are connected to the furnace body 10 in a manner that it can be raised and lowered, the relative positions of the furnace rollers in the furnace body 10 can be changed, thereby driving the relative positions of the workpieces 200 located on the furnace rollers to change.

[0048] Each furnace roller extends along a third direction, and the third direction is perpendicular to the first direction and the second direction.

[0049] It can be understood that the workpiece 200 is severely deformed after quenching due to its thickness being less than or equal to 2 mm, and cannot smoothly enter the tempering furnace 100. The lifting and lowering of the furnace rollers can change the relative position of the workpiece 200, ensuring that the workpiece 200 smoothly enters the furnace; in addition, if the workpiece 200 needs to be hot-corrected or straightened by the furnace rollers on the tempering roller table 30 or the furnace discharge roller table 40, the hot-corrected or straightened workpiece 200 can be assisted by the liftable furnace rollers. In other words, the workpiece 200 is deformed before entering the tempering furnace 100, and after tempering, the flatness of the shape of the workpiece 200 is improved.

[0050] The tempering furnace 100 comprises a furnace body 10 and a conveying track, wherein the conveying track comprises an inlet roller 20, a tempering roller 30 and an outlet roller 40 which are sequentially arranged along a first direction. Since the inlet roller 20, the tempering roller 30 and the outlet roller 40 comprise furnace rollers which are liftably connected to the furnace body 10 along a second direction, the relative positions of the furnace rollers in the furnace body 10 can be changed, thereby driving the relative positions of the workpieces 200 on the furnace rollers to change, which can not only ensure that the workpieces 200 enter the furnace smoothly, but also can achieve thermal correction or straightening of the workpieces 200 with the assistance of liftable furnace rollers, thereby eliminating various residual stresses of the workpieces 200 during the quenching and tempering processes, and ensuring that the shape of the steel plate meets the technical requirements for delivery after tempering.

[0051] The furnace rollers connected to the furnace body 10 in a liftable manner are all moved by the linear drive member 60. Figure 1 Each furnace roller is arranged on a support 70. When the furnace roller and the furnace body 10 are fixedly connected, the support 70 can be connected to the furnace body 10 by screws; when the furnace roller is liftably connected to the furnace body 10, the support 70 corresponding to the furnace roller is connected to the movable end of the linear drive member 60 to move up and down under the action of the linear drive member 60. The linear drive member 60 can be a cylinder, a screw module, etc.

[0052] Please refer to Figure 1 In one embodiment of the present application, the furnace roller 20 is divided into two rows, upper and lower, and the furnace roller 20 includes an upper furnace roller 21 and a lower furnace roller 22. The upper furnace roller 21 and the lower furnace roller 22 are arranged oppositely and spaced along the second direction. The lower furnace roller 22 is close to the bottom of the furnace body 10, and the upper furnace roller 21 is close to the top of the furnace body 10. The furnace rollers of the lower furnace roller 22 can be raised and lowered to the furnace body 10, and the furnace rollers of the upper furnace roller 21 are fixedly connected to the furnace body 10, that is, the furnace rollers located in the upper row are fixedly connected to the furnace body 10, and the furnace rollers located in the lower row can move up and down; the furnace rollers of the upper furnace roller 21 and the lower furnace roller 22 correspond to each other, that is, the projections of the furnace rollers of the upper furnace roller 21 and the lower furnace roller 22 in the first direction overlap. In this way, when the workpiece 200 enters the tempering furnace 100, the furnace rollers of the lower row can move upward at a fixed time to lift the workpiece 200 upward and ensure that the workpiece 200 enters the furnace smoothly.

[0053] It can be understood that the total mass of the workpiece 200 is relatively small, that is, the supporting force required by the furnace roller 20 is relatively small. In order to save energy consumption in the process of conveying the workpiece 200, the furnace rollers of the furnace roller 20 can all be hollow rollers to reduce their own weight.

[0054] Please refer to Figure 1 In one embodiment of the present application, the tempering roller 30 includes a first roller 31, a second roller 32 and a third roller 33 arranged in sequence along the first direction, the first roller 31 is used to preheat the workpiece 200, the second roller 32 is used to heat the workpiece 200, and the third roller 33 is used to level the workpiece 200. That is to say, the tempering roller 30 includes three areas, namely the preheating area 301, the heating area 302 and the leveling area 303. It can be understood that the function of each area is different, and accordingly, the state of the workpiece 200 in the three different areas is also different.

[0055] The furnace rollers of the first roller 31, the second roller 32 and the third roller 33 are all provided with resistance wires 50. That is to say, the furnace rollers of the tempering roller 30 are all provided with resistance wires 50, and the resistance wires 50 can heat the workpiece 200 after being energized, which is highly targeted and can improve the heating efficiency compared with the traditional coal gas or natural gas heating medium.

[0056] Specifically, when the workpiece 200 is in the preheating zone 301, that is, when the workpiece 200 is located on the first roller 31, the resistance wire 50 in the furnace roller of the first roller 31 is energized to generate heat and heat the workpiece 200, so that the temperature of the workpiece 200 rises to a first temperature, and the first temperature is lower than the preset temperature, which is the initial critical temperature for the transformation of pearlite to austenite. In this stage, cracking of the workpiece 200 caused by excessively high and rapid heating temperature can be avoided.

[0057] When the workpiece 200 is in the heating zone 302, that is, when the workpiece 200 is located on the second roller 32, the resistance wire 50 in the furnace roller of the second roller 32 is energized to generate heat and continue to heat the workpiece 200, so that the temperature of the workpiece 200 rises to a preset temperature. At this stage, a sufficiently high temperature can reduce or eliminate the internal stress in the workpiece 200 and make the thermodynamically unstable organizational structure in the workpiece 200 transition to a stable state.

[0058] When the workpiece 200 is in the flattening zone 303, that is, when the workpiece 200 is located on the third roller 33, the resistance wire 50 in the furnace roller of the third roller 33 is energized to generate heat and maintain the temperature of the workpiece 200 at a preset temperature for a certain period of time. In this stage, sufficient insulation time can reduce or eliminate the internal stress in the workpiece 200 and fully transform the thermodynamically unstable organizational structure in the workpiece 200. It can be understood that the time in the flattening zone 303 should not be too long, otherwise the surface decarburization layer may thicken, the organizational grains may become coarser, and the comprehensive mechanical properties may decrease. Among them, the moving speed of the workpiece 200 can be changed by adjusting the rotation speed of each furnace roller.

[0059] Specifically, the furnace rollers of the first roller 31, the second roller 32 and the third roller 33 are all provided with resistance wires 50, and the resistance wires 50 of each furnace roller are controlled independently, so some resistance wires 50 can be closed or opened according to the actual temperature of different areas in the furnace body 10. For example, when the temperature of a certain area is lower than the temperature to be reached, all resistance wires 50 can be electrically connected or the input current can be increased to increase the temperature; when the temperature of a certain area is higher than the temperature to be maintained, some resistance wires 50 can be disconnected or the input current can be reduced to reduce the temperature. It can be understood that in other embodiments of the present application, the resistance wires 50 in adjacent furnace rollers or relative furnace rollers can also be controlled together, without the need to lay too many control lines, which can save costs.

[0060] Please refer to Figure 1 In one embodiment of the present application, the first roller 31 includes a first upper roller 311 and a first lower roller 312, that is, the first roller 31 is divided into two rows, and the first upper roller 311 and the first lower roller 312 are arranged opposite to each other and spaced apart along the second direction. The furnace rollers of the furnace roller 20 near the bottom of the furnace body 10 are connected to the furnace body 10 in a liftable manner, that is, the furnace rollers of the first lower roller 312 are connected to the furnace body 10 in a liftable manner; the furnace rollers of the furnace roller 20 near the top of the furnace body 10 are fixedly connected to the furnace body 10, that is, the furnace rollers of the first upper roller 311 are fixedly connected to the furnace body 10; the furnace rollers of the first upper roller 311 and the first lower roller 312 correspond to each other one by one. In this way, the forces applied by the furnace rollers of the first roller 31 to the workpiece 200 are symmetrical, and the heating is uniform.

[0061] Specifically, the main function of the first roller 31 is to ensure that the workpiece 200 can enter the furnace smoothly and preheat the workpiece 200. In the upper and lower rows of the first rollers 31, the furnace rollers of the first upper rollers 311 are fixed, and the furnace rollers of the first lower rollers 312 can move up and down. When the end of the workpiece 200, that is, the deformed thin-gauge wear-resistant steel plate, faces downward, the furnace rollers of the first lower rollers 312 can move upward and lift the workpiece 200 to ensure that the workpiece 200 moves on the furnace rollers of the first upper rollers 311. Each furnace roller is equipped with a temperature-controllable resistance wire 50, which can instantly preheat the workpiece 200.

[0062] Please refer to Figure 1 In one embodiment of the present application, the second roller 32 includes a second upper roller 321, a second middle roller 322 and a second lower roller 323, that is, the second roller 32 is divided into three rows, namely, the upper, middle and lower rows, and the second upper roller 321, the second middle roller 322 and the second lower roller 323 are arranged at intervals along the second direction. The furnace rollers of the furnace-entering roller 20 in the middle row are fixedly connected to the furnace body 10, namely, the furnace rollers of the second middle roller 322 are fixedly connected to the furnace body 10; the furnace rollers of the remaining two rows of the second roller 32 can be raised and lowered to the furnace body 10, namely, the furnace rollers of the second upper roller 321 and the second lower roller 323 can be raised and lowered to the furnace body 10. That is to say, the furnace rollers of the second middle roller 322 are used to support the workpiece 200, and the furnace rollers of the second upper roller 321 and the second lower roller 323 are used to perform hot correction on the workpiece 200.

[0063] Specifically, the main function of the second roller 32 is to ensure that the workpiece 200 can quickly reach the specified temperature and keep the temperature according to the process, and at the same time perform hot correction on the workpiece 200. In the upper, middle and lower rows of the second rollers 32, the furnace rollers of the second middle roller 322 are fixed, and the furnace rollers of the second upper roller 321 and the second lower roller 323 can move up and down. Each furnace roller is equipped with a temperature-controlled high-efficiency resistance wire 50, which can instantly heat the workpiece 200.

[0064] In addition, the furnace rollers of the second upper roller 321, the second middle roller 322 and the second lower roller 323 are staggered in the first direction, that is, the furnace rollers of the second middle roller 322 are arranged at intervals, and gaps are formed between adjacent furnace rollers of the second middle roller 322, and the furnace rollers of the second upper roller 321 and the furnace rollers of the second lower roller 323 are staggered from each other and are respectively located in different gaps. Therefore, when the workpiece 200 is hot-straightened, it can be ensured that when the workpiece 200 moves along the first direction, the forces at different positions on the workpiece 200 are relatively uniform, so as to expand the effective range of hot straightening.

[0065] It can be understood that the distance between the furnace rollers of the second upper roller 321 and the second lower roller 323 should be equal to or slightly smaller than the thickness of the workpiece 200 .

[0066] Please refer to Figure 1In one embodiment of the present application, the third roller 33 includes a third upper roller 331 and a third lower roller 332, that is, the third roller 33 is divided into two rows, and the third upper roller 331 and the third lower roller 332 are arranged opposite to each other and spaced apart along the second direction, and the furnace roller of the third upper roller 331 can be raised and lowered to the furnace body 10, and the furnace roller of the third lower roller 332 is fixedly connected to the furnace body 10; the furnace rollers of the third upper roller 331 and the third lower roller 332 correspond to each other one by one.

[0067] Specifically, the main function of the third roller 33 is to perform uniform temperature tempering on the workpiece 200 at a specified time and a specified temperature, and to level the workpiece 200 at the same time. In the upper and lower rows of the third rollers 33, the furnace rollers of the third upper roller 331 can move up and down, and the furnace rollers of the third lower roller 332 are fixed. When the workpiece 200 moves to the third roller 33 via the second roller 32, the workpiece 200 moves from the furnace roller of the second middle roller 322 to the furnace roller of the third lower roller 332, and the furnace rollers of the third upper roller 331 and the furnace rollers of the third lower roller 332 correspond to each other. When the workpiece 200 passes, the furnace roller of the third upper roller 331 drops in height, and automatically presses the workpiece 200 with pressure together with the furnace roller of the third lower roller 332 to ensure that the workpiece 200 is straight. Each furnace roller is equipped with a high-efficiency resistance wire 50 that can control temperature, which can instantly heat the workpiece 200.

[0068] The furnace roller 40 includes an upper furnace roller 41 and a lower furnace roller 42, that is, the furnace roller 40 is divided into two rows, and the upper furnace roller 41 and the lower furnace roller 42 are arranged opposite to each other and spaced along the second direction. The furnace rollers of the furnace roller 40 near the top of the furnace body 10 are connected to the furnace body 10 in a movably movable manner, that is, the furnace rollers of the upper furnace roller 41 are connected to the furnace body 10 in a movably movable manner; the furnace rollers of the furnace roller 40 near the bottom of the furnace body 10 are fixedly connected to the furnace body 10, that is, the furnace rollers of the lower furnace roller 42 are fixedly connected to the furnace body 10; the furnace rollers of the upper furnace roller 41 and the lower furnace roller 42 correspond to each other.

[0069] Specifically, the main function of the furnace roller 40 is to ensure that the workpiece 200 is naturally cooled and straightened without deformation. In the upper and lower rows of furnace rollers 40, the furnace rollers of the furnace upper roller 41 can move up and down, and the furnace rollers of the furnace lower roller 42 are fixed, and the furnace rollers of the furnace upper roller 41 and the furnace rollers of the furnace lower roller 42 correspond to each other. Furthermore, the furnace rollers of the furnace roller 40 are all hollow rollers and are arranged at the exit of the tempering furnace 100. When the workpiece 200 passes through, the hollow rollers are automatically pressed down to ensure that the steel plate is straight.

[0070] In this way, when the workpiece 200 moves from the third roller table 33 to the furnace roller table 40, the workpiece 200 moves from the furnace roller of the third lower roller 332 to the furnace roller of the furnace roller 42 of the furnace roller. When the workpiece 200 passes, the furnace roller of the furnace roller 41 of the furnace roller 41 drops in height, and automatically presses the workpiece 200 with the furnace roller of the furnace roller 42 of the furnace roller 42 to ensure that the workpiece 200 is straight.

[0071] It is understood that in other embodiments of the present application, please refer to Figure 2 The furnace rollers of the third roller table 33 near the bottom of the furnace body 10 and the furnace rollers of the furnace roller table 40 near the bottom of the furnace body 10 can be connected to the furnace body 10 in a lifting manner, that is, the furnace rollers of the third lower roller 332 and the furnace rollers of the furnace lower roller 42 can be connected to the furnace body 10 in a lifting manner. In this way, the flexibility of the furnace rollers of the third roller table 33 and the furnace roller table 40 can be improved, and the corresponding two rows of furnace rollers can also be used to squeeze the workpiece 200, which is not limited here.

[0072] The above-mentioned tempering furnace 100 includes a furnace body 10 and a conveying track, and the conveying track includes an entry roller 20, a tempering roller 30 and an exit roller 40 arranged in sequence along a first direction. Since the entry roller 20, the tempering roller 30 and the exit roller 40 include furnace rollers that are liftably connected to the furnace body 10 along a second direction, the relative positions of the furnace rollers in the furnace body 10 can be changed, thereby driving the relative positions of the workpieces 200 located on the furnace rollers to change, which can not only ensure that the workpieces 200 enter the furnace smoothly, but also can achieve thermal correction or straightening of the workpieces 200 with the assistance of the liftable furnace rollers, thereby eliminating various residual stresses of the workpieces 200 during the quenching and tempering processes, and ensuring that the plate shape of the steel plate meets the delivery technical requirements after tempering, thereby solving the technical problems that the thin-gauge wear-resistant steel plate is severely deformed after quenching and cannot enter the tempering furnace 100, and the plate shape of the thin-gauge wear-resistant steel plate does not meet the technical requirements after tempering.

[0073] The embodiment of the second aspect of the present application provides a tempering control method, which uses a tempering furnace as in any embodiment of the first aspect for tempering thin-gauge wear-resistant steel plates, please refer to Figure 1 and Figure 3 , tempering control methods include:

[0074] Step S10 , placing the workpiece 200 on the furnace entry roller conveyor 20 of the tempering furnace 100 , and conveying the workpiece 200 to the first roller conveyor 31 via the furnace entry roller conveyor 20 .

[0075] Specifically, the furnace roller table 20 of the tempering furnace 100 includes an upper furnace roller 21 and a lower furnace roller 22, and one end of the workpiece 200 is placed on the furnace roller of the lower furnace roller 22 of the tempering furnace 100. The furnace roller of the furnace roller table 20 can appropriately adjust its lifting height according to the deformation degree of the workpiece 200 to lift the workpiece 200 upward, so as to ensure that the workpiece 200 enters the furnace smoothly.

[0076] Step S20 , heating the workpiece 200 to a first temperature by using the first roller 31 , and conveying the workpiece 200 to the second roller 32 .

[0077] Specifically, the first roller 31 of the tempering furnace 100 includes a first upper roller 311 and a first lower roller 312. The furnace rollers of the first roller 31 are all provided with resistance wires 50. The temperature detection module and the temperature control module can be used to determine whether the resistance wires 50 in different furnace rollers are working, so as to heat the workpiece 200 to the first temperature for preheating. At the same time, the furnace rollers of the first lower roller 312 move upward to lift the workpiece 200 conveyed through the furnace roller 20, and ensure that the workpiece 200 moves on the furnace rollers of the first upper roller 311, and can convey the workpiece 200 to the second roller 32.

[0078] Step S30 , heating the workpiece 200 to a second temperature by using the second roller 32 , and heat-straightening the workpiece 200 at the same time, wherein the second temperature is greater than the first temperature, and conveying the workpiece 200 to the third roller 33 by the second roller 32 .

[0079] Specifically, the second roller 32 of the tempering furnace 100 includes a second upper roller 321, a second middle roller 322, and a second lower roller 323. The furnace rollers of the second roller 32 are all provided with resistance wires 50. The temperature detection module and the temperature control module can be used to determine whether the resistance wires 50 in different furnace rollers are working, so as to heat the workpiece 200 to the second temperature for tempering. At the same time, the furnace rollers of the second middle roller 322 are used to transport the workpiece 200 transported via the second roller 32. The furnace rollers of the second upper roller 321 and the furnace rollers of the second lower roller 323 are separated from each other, and can appropriately adjust their own lifting heights to perform thermal correction on the workpiece 200.

[0080] Step S40 , using the third roller 33 to heat the workpiece 200 so that the workpiece 200 maintains the second temperature within a preset time, and at the same time flattens the workpiece 200 , and transports the workpiece 200 to the furnace-out roller 40 via the third roller 33 .

[0081] Specifically, the third roller 33 of the tempering furnace 100 includes a third upper roller 331 and a third lower roller 332. The furnace rollers of the third roller 33 are all provided with resistance wires 50. The temperature detection module and the temperature control module can determine whether the resistance wires 50 in different furnace rollers are working or not, so as to keep the workpiece 200 at the second temperature. At the same time, the furnace rollers of the third lower roller 332 convey the workpiece 200 to move in the first direction, and the furnace rollers of the third upper roller 331 move downward to press the workpiece 200 to ensure that the workpiece 200 is straight, and the workpiece 200 can be conveyed to the furnace roller 40.

[0082] In step S50 , the workpiece 200 is leveled by the out-of-furnace roller table 40 and the workpiece 200 is output out of the outlet of the furnace body 10 .

[0083] Specifically, the furnace roller 40 of the tempering furnace 100 includes an upper furnace roller 41 and a lower furnace roller 42. The furnace rollers of the furnace roller 40 are hollow rollers, which are used to ensure that the workpiece 200 is naturally cooled and straightened without deformation. At the same time, the furnace rollers of the lower furnace roller 42 convey the workpiece 200 to move in the first direction, and the furnace rollers of the upper furnace roller 41 move downward to press the workpiece 200 to ensure that the workpiece 200 is straight, and the workpiece 200 can be conveyed from the exit of the furnace body 10 to the next process. In this process, the workpiece 200 is naturally cooled and tempering is completed.

[0084] The above-mentioned tempering control method drives the relative position of the workpiece 200 on the furnace roller to change by means of the furnace rollers which are liftably connected to the furnace body 10. This not only ensures that the workpiece 200 can enter the furnace smoothly, but also can achieve thermal correction or straightening of the workpiece 200 with the assistance of the furnace rollers in different tempering sections, thereby eliminating various residual stresses of the workpiece 200 during the quenching and tempering process and improving the quality of the workpiece 200.

[0085] Please refer to Figure 1 and Figure 2 In one embodiment of the present application, the furnace entry roller 20 includes an upper furnace entry roller 21 and a lower furnace entry roller 22, and the upper furnace entry roller 21 and the lower furnace entry roller 22 are arranged opposite to each other and spaced apart along the second direction. Step S10, placing the workpiece 200 on the furnace entry roller 20 of the tempering furnace 100, includes:

[0086] Step S11, placing one end of the workpiece 200 on the lower roller 22 entering the furnace.

[0087] Step S12, the furnace roller of the lower roller 22 entering the furnace rises at a target time, the target time is inversely proportional to the rotation speed of the furnace roller, and the target time is proportional to the distance between adjacent furnace rollers.

[0088] It can be understood that the faster the rotation speed of the furnace roller is, the faster the workpiece 200 moves along the first direction, and the remaining furnace rollers of the lower roller 22 entering the furnace need to rise within a shorter preset time to support the workpiece 200 in time; the closer the distance between adjacent furnace rollers is, the shorter the time the workpiece 200 can reach the adjacent furnace rollers, and the adjacent furnace rollers need to rise within a shorter preset time to support the workpiece 200 in time.

[0089] The above-mentioned tempering control method drives the relative position of the workpiece 200 on the furnace roller to change by means of the furnace rollers which are liftably connected to the furnace body 10, which can not only ensure that the workpiece 200 can enter the furnace smoothly, but also can realize the thermal correction or straightening of the workpiece 200 with the assistance of the furnace rollers in different tempering sections, thereby eliminating various residual stresses of the workpiece 200 during the quenching and tempering process, and ensuring that the plate shape of the steel plate meets the technical requirements for delivery after tempering, thereby solving the technical problem that the thin-gauge wear-resistant steel plate is severely deformed after quenching and cannot enter the tempering furnace 100, and the plate shape of the thin-gauge wear-resistant steel plate does not meet the technical requirements after tempering.

[0090] In one embodiment, the tempering control method further includes: collecting data that can be collected from the workpiece 200 entering the tempering furnace 100 to leaving the tempering furnace 100, analyzing the data to determine whether there is an abnormality in the tempering process, and issuing an early warning if there is an abnormality.

[0091] In one embodiment, the tempering control method further includes: collecting data that can be collected from the workpiece 200 from entering the tempering furnace 100 to leaving the tempering furnace 100, and using a self-learning model to update control data.

[0092] The embodiment of the third aspect of the present application provides a tempering control system for controlling the tempering furnace 100 in any embodiment of the first aspect to temper a thin-gauge wear-resistant steel plate. The tempering control system includes:

[0093] The information collection module is used to collect data that can be collected from the workpiece 200 from entering the tempering furnace 100 to leaving the tempering furnace 100, and provide it to the processing module, for example, the temperature and time of the steel plate tempering process, the running speed and pressure of each furnace roller, and other data.

[0094] The database is used to store various data and pictures related to the workpiece 200, such as the steel type, specification, history of the steel plate, the temperature and time during the tempering process of the steel plate, the running speed and pressure of each furnace roller, etc. Among them, the steel type, specification and history of the steel plate can be collected by the visual recognition system through the two-dimensional code mark on the steel plate to quickly identify the above information; the temperature and time during the tempering process of the steel plate can be collected by the temperature detection module and the temperature control module provided in the tempering furnace 100; the running speed of each furnace roller can be collected by the encoder and other measurement modules provided on each furnace roller; the pressure of the furnace roller can be measured by the thin film pressure sensor provided on each furnace roller.

[0095] The control module is used to receive and process data from the information collection module and the database, and generate execution instructions, alarm instructions and control data.

[0096] The execution module is used to receive the execution instruction of the control module and execute the control on the tempering furnace 100.

[0097] The alarm module is used to receive alarm instructions and alarm for abnormal situations. The standards for abnormal situations are set manually.

[0098] The self-learning adaptive module receives control data, judges the quality of the control data by the production results corresponding to the control data, and replaces abnormal control data with high-quality control data to achieve the purpose of continuous optimization, continuous correction and continuous adaptation.

[0099] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A tempering furnace for tempering a workpiece, wherein the workpiece is a thin wear-resistant steel plate with a thickness less than or equal to 2 mm, the tempering furnace comprising a furnace body and a conveying track, characterized in that: The conveying track includes an inlet roller conveyor, a tempering roller conveyor and an outlet roller conveyor which are sequentially arranged along a first direction; The furnace entry roller is arranged at the entrance of the furnace body and is used to transport the workpiece to the tempering roller along the first direction, and the furnace exit roller is arranged at the exit of the furnace body and is used to transport the workpiece transferred from the tempering roller; The furnace entry roller, the tempering roller and the furnace exit roller each include a plurality of furnace rollers, and at least one of the plurality of furnace rollers is connected to the furnace body in a liftable manner along a second direction, and the second direction is perpendicular to the first direction; The tempering roller table includes a first roller table, a second roller table and a third roller table which are sequentially arranged along the first direction, the first roller table is used for preheating the workpiece, the second roller table is used for heating the workpiece, and the third roller table is used for leveling the workpiece; the first roller table includes a first upper roller and a first lower roller, the first upper roller and the first lower roller are arranged oppositely and at intervals along the second direction, the furnace roller of the first lower roller can be lifted and connected to the furnace body, and the furnace roller of the first upper roller is fixedly connected to the furnace body; the furnace rollers of the first upper roller and the first lower roller correspond to each other one by one; the second roller table includes a second upper roller, a second middle roller and a second lower roller, the second upper roller, the second middle roller and the second lower roller are arranged at intervals along the second direction, the furnace roller of the second middle roller is fixedly connected to the furnace body, and the furnace rollers of the second upper roller and the second lower roller can be lifted and connected to the furnace body; The furnace rollers of the second upper roller, the second middle roller and the second lower roller are staggered in the first direction; the third roller comprises a third upper roller and a third lower roller, the third upper roller and the third lower roller are opposite to each other and spaced apart in the second direction, the furnace roller of the third upper roller is liftably connected to the furnace body, and the furnace rollers of the third upper roller and the third lower roller correspond to each other one by one.

2. The tempering furnace according to claim 1, characterized in that: The furnace entry roller table includes an upper furnace entry roller and a lower furnace entry roller, and the upper furnace entry roller and the lower furnace entry roller are arranged opposite to each other and at intervals along the second direction. The furnace roller of the lower furnace entry roller can be raised and lowered and connected to the furnace body, and the furnace roller of the upper furnace entry roller is fixedly connected to the furnace body; the furnace rollers of the upper furnace entry roller and the lower furnace entry roller correspond to each other one by one.

3. The tempering furnace according to claim 1 or 2, characterized in that: Resistance wires are arranged inside the furnace rollers of the first roller, the second roller and the third roller.

4. The tempering furnace according to claim 1, characterized in that: The furnace roller table includes an upper furnace roller and a lower furnace roller, the upper furnace roller and the lower furnace roller are arranged opposite to each other and at intervals along the second direction, the furnace rollers of the upper furnace roller can be raised and lowered and connected to the furnace body, and the furnace rollers of the upper furnace roller and the lower furnace roller correspond to each other one by one.

5. The tempering furnace according to claim 4, characterized in that: The furnace roller of the third lower roller and the furnace roller of the furnace-out lower roller are respectively fixedly connected to the furnace body; Alternatively, the furnace roller of the third lower roller and the furnace roller of the furnace-exiting lower roller can be connected to the furnace body in a liftable manner.

6. A tempering control method, characterized in that: Using the tempering furnace according to any one of claims 1 to 5, the tempering control method comprises: Placing the workpiece on the furnace entry roller of the tempering furnace, and conveying the workpiece to the first roller through the furnace entry roller; heating the workpiece to a first temperature by using the first roller conveyor, and conveying the workpiece to a second roller conveyor; Using the second roller to heat the workpiece to a second temperature, and simultaneously heat-correcting the workpiece, wherein the second temperature is greater than the first temperature, and transporting the workpiece to a third roller via the second roller; Using the third roller to heat the workpiece so that the workpiece maintains the second temperature for a preset time, flattening the workpiece, and conveying the workpiece to a furnace-out roller via the third roller; The workpiece is leveled by the furnace discharge roller and discharged outward from the furnace body outlet.

7. The tempering control method according to claim 6, characterized in that: The furnace entry roller comprises an upper furnace entry roller and a lower furnace entry roller, the upper furnace entry roller and the lower furnace entry roller are arranged opposite to each other and spaced apart along a second direction, and placing the workpiece on the furnace entry roller of the tempering furnace comprises: Placing one end of the workpiece on the lower roller for entering the furnace; The furnace roller of the lower furnace roller rises at a target time, the target time is inversely proportional to the rotation speed of the furnace roller, and the target time is proportional to the distance between adjacent furnace rollers.

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