Quenching cooling device and quenching method using the quenching cooling device

Abstract

The present application discloses a quenching cooling device and a quenching method using the quenching cooling device. The quenching cooling device includes a heating device and a quenching device, and the quenching device includes a pad and a pressure plate. The pressure plate is movably arranged on the pad, and the pressure plate and the pad can be arranged at a first preset distance to clamp the material to be quenched and perform pressure-maintaining quenching on the material to be quenched. The quenching cooling device of the embodiment of the present application utilizes the excellent thermal conductivity of metallic iron, uses steel containing iron to make the pad and the pressure plate, and uses thick slabs as the pad and the pressure plate at room temperature to clamp the heated material to be quenched for rapid and uniform cooling to achieve a quenching effect.

Description

Technical Field

[0001] The present application belongs to the technical field of steel material detection devices, and in particular relates to a quenching cooling device and a quenching method using the quenching cooling device. Background Art

[0002] The quenching principle of steel is to heat the steel to a temperature above the critical temperature Ac3 (hypoeutectoid steel) or Ac1 (hypereutectoid steel), keep it warm for a period of time to make it fully or partially austenitized, and then quickly cool it to below Ms (or isothermally near Ms) at a cooling rate greater than the critical cooling rate to perform a heat treatment process for martensite (or bainite) transformation, so as to achieve the purpose of improving the hardness, wear resistance, fatigue resistance, etc. of the material.

[0003] Traditional quenching methods often require the use of special quenching equipment, which is complicated to operate and costly. In addition, the quenching of high-strength and thin steel plate materials is prone to problems such as material rebound and cracking. It is also difficult to simulate the quenching process of hot-formed steel stamping and pressure holding. It is expensive to entrust a third party to test, and the cycle of obtaining experimental results is long. Therefore, it is necessary to develop a simple, efficient, low-cost cooling device and corresponding quenching method that can be used to simulate the quenching of hot-formed materials. Summary of the invention

[0004] The embodiment of the present application provides a quenching cooling device and a quenching method using the device, which utilizes the excellent thermal conductivity of metal iron and uses thick slabs at room temperature to clamp and heat the material to be quenched to quickly and evenly cool the material to be quenched, so as to achieve a quenching effect.

[0005] In the first aspect, the present application provides a quenching and cooling device, comprising: a heating device; and a quenching device, comprising a pad and a pressure plate; the pressure plate is movably arranged on the pad, and the pressure plate and the pad can be arranged at a first preset distance to clamp the material to be quenched and perform pressure-maintaining quenching on the material to be quenched.

[0006] According to an embodiment of the first aspect of the present application, the cooling rate of the pad and the pressure plate is 30°C / min to 50°C / min.

[0007] According to an embodiment of the first aspect of the present application, the first preset distance is equal to the thickness of the material to be quenched.

[0008] According to the embodiment of the first aspect of the present application, the backing plate and the pressure plate are both made of low-multiple sample continuous casting slabs produced by a conventional continuous casting machine of a 210 converter plant.

[0009] According to the embodiment of the first aspect of the present application, the length, width and thickness of the pressure plate and the pad are 360 ​​mm, 230 mm and 200 mm respectively.

[0010] According to an embodiment of the first aspect of the present application, the surfaces of the pressure plate and the backing plate that are in contact with the material to be quenched are polished surfaces that have been polished.

[0011] According to an embodiment of the first aspect of the present application, the relative projection area of ​​the pressing plate and the backing plate is greater than ≥50%.

[0012] According to the embodiment of the first aspect of the present application, the surface roughness of the polished surfaces of the pressing plate and the backing plate in contact with the material to be quenched must satisfy Ra≤0.1 μm.

[0013] According to an embodiment of the first aspect of the present application, the first preset distance is equal to the thickness of the material to be quenched.

[0014] According to an embodiment of the first aspect of the present application, a first moving handle for moving the pad is provided on the pad, and a second moving handle for moving the pressing plate is provided on the pressing plate.

[0015] According to an embodiment of the first aspect of the present application, the first movable handle is arranged at the lower part of the contact surface between the backing plate and the material to be quenched, and the second movable handle is arranged at the upper part of the contact surface between the pressing plate and the material to be quenched.

[0016] According to an embodiment of the first aspect of the present application, the first movable handle is arranged in parallel on both sides of the lower part of the contact surface between the pad and the material to be quenched, or the first movable handle is arranged around the pad on the circumferential side of the lower part of the contact surface between the pad and the material to be quenched.

[0017] According to an embodiment of the first aspect of the present application, the second movable handle is arranged in parallel on both sides of the upper part of the contact surface between the pressing plate and the material to be quenched, or the second movable handle is arranged around the pressing plate on the circumferential side of the upper part of the contact surface between the pressing plate and the material to be quenched.

[0018] In a second aspect, the present application provides a quenching method using a quenching cooling device, comprising: heating the material to be quenched in a heating device according to a set target time and target temperature to obtain a heated material to be quenched; placing the heated material to be quenched on a pad of the quenching device, using a pressure plate cover of the quenching device to compact the heated material to be quenched, and maintaining the pressure on the heated material to be quenched for a first preset time to quench the heated material to be quenched to obtain a quenched material.

[0019] According to an embodiment of the second aspect of the present application, using a pressure plate cover of a quenching device to compact the heated material to be quenched to perform a pressure-maintaining treatment on the heated material to be quenched includes: applying a first preset pressure to the heated material to be quenched so that the pad and the pressure plate are tightly connected to the heated material to be quenched; maintaining the first preset pressure of the pad and the pressure plate on the heated material to be quenched for a first preset time to perform a quenching treatment to cool the temperature of the heated material to be quenched to room temperature, thereby obtaining a quenched material.

[0020] According to an embodiment of the second aspect of the present application, the target temperature refers to that the material to be quenched is heated to 800°C to 1000°C.

[0021] According to an embodiment of the second aspect of the present application, the first preset pressure is 15000Pa to 25000Pa.

[0022] According to an embodiment of the second aspect of the present application, the room temperature is 15° C. to 35° C., and the first preset time is the time required for the temperature of the heated material to be quenched to drop to room temperature.

[0023] According to an embodiment of the second aspect of the present application, the cooling rate for quenching treatment is 30°C / min to 50°C / min.

[0024] The quenching cooling device of the embodiment of the present application utilizes the excellent thermal conductivity of metallic iron and uses steel containing iron to make a pad and a pressure plate respectively. Thick slabs at room temperature are used as pads and pressure plates to clamp the heated material to be quenched for rapid and uniform cooling to achieve a quenching effect.

[0025] The quenching method of the quenching cooling device in the embodiment of the present application can effectively prevent the deformation of the thin steel plate as the material to be quenched during the quenching process by clamping the material to be quenched with a pad and a pressure plate. At the same time, through precise heating control and cooling process, the quenching treatment of the material to be quenched can be completed quickly while effectively shortening the cooling treatment time to ensure the stability of the test product. And there is no need to use additional cooling media such as water, oil, and salt water, which significantly reduces energy consumption and environmental pollution, and conforms to the green and environmentally friendly production concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 It is a schematic diagram of the structure of the quenching cooling device provided in an embodiment of the present application.

[0028] Figure 2 It is a schematic flow chart of the quenching method provided in the embodiment of the present application.

[0029] Figure 3 This is the metallographic structure diagram of the hot-formed steel cold-rolled plate test specimen of Example 1 before quenching treatment.

[0030] Figure 4 This is the metallographic structure diagram of the hot-formed steel cold-rolled plate test specimen of Example 1 after quenching treatment.

[0031] Figure 5 The mechanical tensile test samples of Example 2 are cold-rolled sheets of hot-formed steel of the same grade that are quenched at different heating temperatures.

[0032] Figure 6 These are test samples of hot-formed steel cold-rolled sheets of different grades after quenching in Example 2.

[0033] Figure 7 It is the mark left on the polished surface of the pressing plate after the test sample is quenched by the pressing plate of the quenching cooling device in Example 2.

[0034] Explanation of the accompanying drawings: 1. Quenching device; 11. Pad; 111. First movable handle; 12. Pressing plate; 121. Second movable handle; 13. Polishing surface; 14. Scratches; L. Length of the pad or pressing plate; W. Width of the pad or pressing plate; T. Thickness of the pad or pressing plate; H. First preset spacing. DETAILED DESCRIPTION

[0035] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0037] In order to solve the problems of the prior art, an embodiment of the present application provides a quenching cooling device and a quenching method using the quenching cooling device.

[0038] The following first introduces the quenching cooling device provided in the embodiment of the present application. Figure 1 The schematic diagram of the structure of the quenching cooling device provided in the embodiment of the present application is shown. Figure 1 As shown, the quenching and cooling device includes: a heating device and a quenching device 1; the quenching device 1 includes a pad 11 and a pressing plate 12; the pressing plate 12 is movably arranged on the pad 11, and the pressing plate 12 and the pad 11 can be arranged at a first preset distance to clamp the material to be quenched and perform pressure-maintaining quenching on the material to be quenched.

[0039] The quenching cooling device of the embodiment of the present application utilizes the excellent thermal conductivity of metallic iron and uses steel containing iron to make a pad and a pressure plate respectively. Thick slabs at room temperature are used as the pad and the pressure plate to clamp the heated material to be quenched, and perform rapid and uniform cooling to achieve a quenching effect.

[0040] In the embodiment of the present application, the heating device is used to quickly and evenly heat the steel plates and steel bars to be quenched, so as to heat the material to be quenched for a target time to a target temperature, and obtain the material to be quenched in a heated state. Optionally, the heating device uses a precision box-type experimental electric furnace with a model of SXL-1400 and a maximum heating temperature of 1400°C. It is understood that the heating device can also use other heating furnaces in the technical field that can heat the material to be quenched to the target temperature.

[0041] In some embodiments of the present application, the cooling rates of the backing plate and the pressing plate are both 30° C. / min to 50° C. / min, which can quickly quench the material to be quenched so as to perform corresponding tests.

[0042] In some embodiments of the present application, the first preset distance is equal to the thickness of the material to be quenched, so that the quenching device is in full contact with the material to be quenched and the clamped material to be quenched is quenched.

[0043] In some embodiments of the present application, the backing plate and the pressing plate are made of scrapped low-multiple sample continuous casting slabs produced by conventional continuous casting machines of 210 converter plants. The backing plate and the pressing plate are made of residual slabs of carbon structural steel or alloy steel continuous casting low-multiple sample slabs with good surface quality.

[0044] In the embodiment of the present application, the low-multiple sample continuous casting slab produced by the conventional continuous casting machine of the 210 converter plant can be used to cut into the pad and pressure plate of the quenching device to save the cost of the test device. The low-multiple sample continuous casting slab produced by the conventional continuous casting machine of the 210 converter plant has excellent thermal conductivity, which can make the heated material to be quenched cool quickly and evenly to achieve the quenching effect. Optionally, the low-multiple sample continuous casting slab can use the scrapped low-multiple sample continuous casting slab that has been tested, or the directly produced low-multiple sample continuous casting slab can be used. The conventional continuous casting machine of the 210 converter plant generally returns the low-multiple sample continuous casting slab in each flow for each casting to analyze the defects such as center segregation, center looseness, middle cracks, triangular cracks, corner cracks, A1203 inclusions, pores, etc. of the continuous casting slab in the low-multiple detection. After the detection, part of the low-multiple sample continuous casting slab will be scrapped, resulting in a waste of slab samples. Therefore, the present application utilizes the low-magnification continuous casting slab sample to make a quenching device, and the sample can be effectively utilized.

[0045] The quenching and cooling device of the present application is convenient to obtain materials, has a simple structure, is easy to manufacture and operate, and has low cost. Compared with conventional liquid cooling media, it is more suitable for quenching tests that simulate the forming process of hot-formed materials. The quenching device uses high-strength steel with fast heat conduction and high temperature resistance to make the pad and the pressure plate respectively, and clamps the material to be quenched to maintain pressure for quenching treatment, which can effectively prevent the thin steel plate material from deformation, rebound and cracking during the quenching process. Through precise heating control and cooling process, it can quickly complete the quenching process while ensuring the stability of the test product quality.

[0046] In addition, the quenching cooling device of the present application can simulate the quenching process of stamping and holding pressure of hot-formed steel through the quenching device, that is, the experimental material of the hot-formed steel is stamped and held pressure using a pad and a pressure plate, and the quenching treatment can be completed in a shorter time, effectively shortening the cycle of obtaining the quenching test and quickly obtaining the test results.

[0047] In some embodiments of the present application, the length L, width W, and thickness T of the pressing plate and the pad are 360 ​​mm, 230 mm, and 200 mm, respectively, so as to maintain pressure on the heated material to be quenched through a slab with certain specifications, and to be able to quickly absorb the heat of the heated material to be quenched, so that it can be cooled quickly.

[0048] In some embodiments of the present application, the surfaces of the pressing plate and the pad in contact with the material to be quenched are polished surfaces that have been polished, and the surface roughness of the polished surfaces of the pressing plate and the pad in contact with the material to be quenched must satisfy Ra≤0.1μm.

[0049] In the embodiment of the present application, the surface of the pressing plate and the backing plate in contact with the material to be quenched is polished to form a low-magnification polished surface, which is used as the contact surface between the backing plate and the pressing plate and the material to be quenched to detect surface defects of some of the materials to be quenched. For example, the polished surface 13 of the backing plate and the pressing plate in the quenching device of the quenching cooling device is used to detect and reveal hidden defects such as surface scratches and inclusions after quenching of the cold-rolled sheet.

[0050] In some embodiments of the present application, the relative projection area of ​​the pressing plate and the pad is greater than or equal to 50%. Exemplarily, when the polishing surfaces of the pad and the pressing plate clamp the material to be quenched, the repetition rate of the projection area of ​​the polishing surfaces of the pad and the pressing plate at the bottom reaches 50%, 55%, 60%, 64%, 70%, 75%, 80%, 85%, 90%, 96%, 100%. So that the material to be quenched can be quenched using the pressing plate and the pad. The repetition rate of the projection area of ​​the polishing surfaces of the pad and the pressing plate at the bottom is 100%, that is, the pad and the pressing plate clamp the material to be quenched, and their respective polishing surfaces are arranged relatively and the polishing surfaces completely correspond to each other.

[0051] In some embodiments of the present application, a first moving handle 111 for moving the backing plate 11 is provided on the backing plate 11 , and a second moving handle 121 for moving the backing plate 12 is provided on the pressing plate 12 .

[0052] In some embodiments of the present application, Figure 1 As shown, the first moving handle 111 is disposed below the contact surface between the backing plate 11 and the material to be quenched, so that the backing plate 11 can be moved by the first moving handle 111. The second moving handle 121 is disposed above the contact surface between the pressing plate 12 and the material to be quenched, so that the pressing plate 12 can be moved by the second moving handle 121.

[0053] like Figure 1 As shown, the first movable handle 111 is arranged in parallel on both sides of the lower part of the contact surface between the pad 11 and the material to be quenched. Optionally, the first movable handle 111 can be arranged in parallel on both sides of the length L direction of the pad 11, or can be arranged in parallel on both sides of the width W direction, or can be arranged perpendicular to the two side surfaces of the pad width direction W, or the first movable handle 111 can be arranged on the side of the pad 11 away from the polishing surface by grooving the bottom of the pad 11. It is understandable that the first movable handle 111 can also be arranged around the pad 11 on the circumference of the lower part of the contact surface between the pad 11 and the material to be quenched, so as to move the pad 11 by the first movable handle 111.

[0054] In some embodiments of the present application, Figure 1 As shown, the second movable handle 121 is arranged in parallel on both sides of the upper part of the contact surface between the pressing plate 12 and the material to be quenched. Optionally, the second movable handle 121 can be arranged in parallel on the back of the contact surface between the pressing plate 12 and the material to be quenched, that is, the top of the pressing plate away from the polishing surface; or the second movable handle 121 is arranged in parallel on both sides of the length L direction of the pressing plate 12, or is arranged in parallel on both sides of the surface in the width direction of the pressing plate 12, or is arranged perpendicular to the surfaces on both sides of the width W direction of the pressing plate 12. It can be understood that the second movable handle 121 surrounds the pressing plate 12 and is arranged on the circumference of the upper part of the contact surface between the pressing plate 12 and the material to be quenched, so as to move the pressing plate 12 through the second movable handle 121.

[0055] It should be noted that the first moving handle 111 and the second moving handle 121 can be made of steel pipes or steel bars, and fixed to the pad and the pressing plate respectively by welding or other methods. Or they can be made of other heat-insulating materials so that the pad and the pressing plate can be moved by the first moving handle and the second moving handle.

[0056] The quenching and cooling device of the embodiment of the present application is made of strong materials, has a long shelf life, and can be continuously recycled.

[0057] The quenching cooling device of the embodiment of the present application is suitable for quenching treatment of cold-rolled plates with a quenching temperature range of 800°C to 1000°C or hot-rolled plates with a thickness of ≤6mm, so that the internal structure of the metal plate changes within this quenching temperature range, so that the quenched metal plate can become harder and more wear-resistant. It should be noted that the specific selection of the quenching temperature also needs to consider the type, composition and required physical and mechanical properties of the metal material. For example, for different steels, such as carbon structural steel, alloy structural steel, etc., the quenching heating temperature will be different. Therefore, in actual operation, it is necessary to determine the optimal quenching temperature according to the specific situation.

[0058] In a second aspect, the present application provides a quenching method using the above-mentioned quenching cooling device, comprising:

[0059] S1, heating the material to be quenched in a heating device according to the set target time and target temperature to obtain the material to be quenched in a heated state;

[0060] S2. Place the heated material to be quenched on a pad of a quenching device, and use a pressure plate of the quenching device to cover the heated material to be quenched and press the heated material to be quenched for a first preset time to quench the heated material to obtain a quenched material.

[0061] The quenching method using the quenching cooling device in the embodiment of the present application can effectively prevent the problem of deformation of thin steel plates as the material to be quenched during the quenching process. At the same time, precise heating control is performed through the heating device of the quenching cooling device, and the quenching cooling process is controlled by the quenching device of the quenching cooling device, which can quickly complete the quenching treatment between the pad and the pressure plate while ensuring the stability of the test product. And there is no need to use additional cooling media such as water, oil, and salt water, which significantly reduces energy consumption and environmental pollution, and is in line with the green and environmentally friendly production concept.

[0062] In an embodiment of the present application, the target temperature in step S1 refers to the time required for heating the material to be quenched to 800°C to 1000°C, and the target time in step S1 refers to the time required for heating the material to be quenched to the target temperature. Exemplarily, the target time is 1.5, 1.8, 2, 2.5, 3, 3.6, 4, 4.2, 4.5, 4.9, 5 minutes. The target temperature can partially or completely convert the material to be quenched into austenite, so that in the step of quenching, the structure of the steel is converted from austenite to martensite or bainite when it is rapidly cooled to an isothermal temperature near Ms or below Ms.

[0063] In an embodiment of the present application, a clamp can be used to remove the heated material to be quenched from the heating device and placed on a pad of the quenching device. At the same time, a pressing plate can be used to cover the heated material to be quenched to compact the material to be quenched to apply a first preset pressure.

[0064] In some embodiments of the present application, using a pressure plate cover of a quenching device to compact the heated material to be quenched, and performing a pressure-maintaining treatment on the heated material to be quenched includes:

[0065] S201, applying a first preset pressure to the heated material to be quenched, so that the backing plate and the pressing plate are tightly connected to the heated material to be quenched;

[0066] S202, maintaining a first preset pressure on the heated material to be quenched by the backing plate and the pressing plate for a first preset time to perform a quenching treatment to cool the heated material to be quenched to room temperature, thereby obtaining a quenched material.

[0067] In some embodiments of the present application, the applied pressure lower than the preset pressure is equal to the ratio of the weight of the press plate itself to the contact area between the press plate and the material to be quenched.

[0068] In some embodiments of the present application, the first preset pressure applied to the heated material to be quenched is 15000MPa-25000Pa.

[0069] In the embodiment of the present application, the backing plate and the pressing plate are made to maintain a first preset pressure on the heated material to be quenched, so that the pressing plate and the backing plate can be in close contact with the heated material to be quenched, so as to use the excellent thermal conductivity of metal iron to cool the heated material to be quenched, and quickly cool the heated material to be quenched. The first preset pressure is maintained for a first preset time to quickly cool the heated material to be quenched to room temperature.

[0070] In some embodiments of the present application, the cooling rate of the quenching treatment is 30° C. / min to 50° C. / min.

[0071] In some embodiments of the present application, the room temperature is 15° C. to 35° C., and the first preset time is the time required for the temperature of the heated material to be quenched to drop to room temperature.

[0072] The quenching cooling device of the embodiment of the present application and the quenching method using the quenching cooling device are suitable for quenching treatment of cold-rolled plates or hot-rolled plates with a thickness of ≤6mm to achieve a quenching effect. It is particularly suitable for quenching treatment of high-strength and thin steel plate materials, and can more realistically simulate the quenching process of hot-formed steel. The quenching cooling device of the present application and the quenching method using the quenching cooling device can also be used for quenching tests of conventional materials, or used to compare the differences in parameters such as surface, performance and organization of materials after quenching under the same or different temperature parameters.

[0073] After the quenching treatment of the material to be quenched is completed by the quenching device and the quenching method of the present application, the quenched material is taken out and subjected to subsequent treatment, such as tempering, polishing or directly conducting relevant performance tests.

[0074] The present application will be further described below through specific embodiments.

[0075] Example 1

[0076] A quenching test of a hot-formed steel cold-rolled sheet is simulated to effectively evaluate the hot-formability and microstructure of the hot-formed steel cold-rolled sheet using the quenching cooling device of the present application.

[0077] Test process flow: production of test samples → setting heating parameters of thermoforming material test samples → heating and keeping the test samples in the heating device according to the set parameters → quickly placing the test samples in the quenching device for quenching and cooling → cleaning the surface of the quenched material test samples → conducting organization and performance testing on the quenched material test samples.

[0078] 1) Preparation of test samples

[0079] A piece of hot-formed steel cold-rolled plate is selected as the material to be quenched, and the material with a shearing specification of 200mm*300mm*1.5mm is used as a test sample of the material to be quenched. The suitable quenching temperature of the hot-formed steel cold-rolled plate is 900℃~960℃.

[0080] 2) Heating of test specimens

[0081] Before the test, the temperature in the SXL--1400 precision box-type test electric furnace is heated to the target temperature of 900℃~950℃ required for the material test, and the test sample is quickly placed in the furnace and kept warm for 3min~10min to obtain a heated test sample.

[0082] 3) Quenching treatment of test specimens

[0083] Quickly take out the heated test sample from the precision box-type test furnace and place it in the Figure 1 On the pad of the quenching device shown, the pressure plate of the quenching device is used to cover the heated test sample and maintain pressure for 25 seconds to allow the heated test sample to cool to room temperature, completing the quenching treatment of the test sample and obtaining a test sample of quenched material.

[0084] 4) Performance testing

[0085] The surface of the test specimens of the quenched material shall be cleaned, and the mechanical properties and structure of the test specimens of the quenched material shall be tested as required by the test.

[0086] 1. Comparison of the organization of hot-formed steel cold-rolled plate material before and after quenching treatment

[0087] During the quenching process of hot-formed steel cold-rolled plates, when the cooling rate of the test specimen reaches 30℃ / s~50℃ / s, the temperature can be quickly reduced to hinder the transformation of austenite to ferrite and bainite, thereby obtaining an ideal martensitic structure to achieve the purpose of improving the strength of formed parts.

[0088] Figure 3 This is the metallographic structure diagram of the hot-formed steel cold-rolled plate test specimen before quenching treatment, such as Figure 3 As shown in the figure, before quenching treatment, the hot-formed steel cold-rolled plate test specimen has an F+P structure, wherein F is a ferrite structure and P is a pearlite structure. Figure 4 This is the metallographic structure diagram of the hot-formed steel cold-rolled plate test specimen after quenching treatment, such as Figure 4 As shown in Figure 2, after quenching, the metallographic structure of the hot-formed steel cold-rolled plate test specimen is mostly needle-shaped and lath-shaped M structure + a small amount of granular B structure, where M represents martensite structure and B represents bainite structure, corresponding to Figure 4The bainite in the steel sheet is a non-layered structure composed of parallel strip-shaped ferrite and parallel cementite. The comparison results of the metallographic structure diagrams before and after quenching prove that the quenching and cooling device of the present application can effectively realize the effective quenching and cooling of the hot-formed steel cold-rolled sheet.

[0089] 2. Mechanical properties test of hot-formed steel cold-rolled plate material before and after quenching

[0090] The mechanical properties of the test specimens of the quenched materials were tested using the GB / T228.1-2021 "Tensile test of metallic materials Part 1: Room temperature test method", and the test results are recorded in Table 1 below.

[0091] Table 1 Mechanical properties of test specimens before and after quenching

[0092]

[0093] The mechanical property test results of the hot-formed steel cold-rolled sheet before and after quenching in Table 1 show that after quenching and cooling by the quenching and cooling device of the present application, the mechanical properties of the test specimens of the hot-formed steel cold-rolled sheet, including yield strength and tensile strength, can be effectively improved.

[0094] Example 2

[0095] The quenching test is carried out using the quenching cooling device of the present application, and the differences in surface, performance, structure and other parameters of the materials that have completed the quenching treatment are compared using the GB / T228.1-2021 "Metallic Materials Tensile Test Part 1: Room Temperature Test Method" method after quenching at the same or different temperature parameters.

[0096] Test process flow: Preparation of test samples → Setting heating parameters of hot forming materials → Heating and keeping the test samples in a heating device according to the set parameters → Quickly placing the test samples in a quenching and cooling device for quenching and cooling → Cleaning the surface of the quenched material test samples → Testing the material properties and structure of the test samples after quenching.

[0097] 1) Preparation of test samples

[0098] Different comparative test cold-rolled plates were selected and all made into P6 specimens (also cut into strips of the same specifications) in the standard GB / T228.1-2021 "Tensile test of metallic materials Part 1: Room temperature test method", and the specimen direction was transverse.

[0099] 2) Heating of test specimens

[0100] Before the test, the temperature in the precision box-type test electric furnace is heated to the target temperature of 900℃~960℃ required for the material test, and the test sample is quickly placed in the furnace for 3min~5min of insulation heating time to obtain the heated test sample.

[0101] 3) Quenching treatment of test specimens

[0102] The heated test specimen is quickly taken out from the precision box-type test electric furnace and placed on the pad of the quenching and cooling device. The pressure plate of the quenching device is used to cover the heated test specimen and maintain pressure for 30 seconds to cool the heated test specimen to room temperature. The quenching treatment of the test specimen is completed to obtain the quenched material.

[0103] 4) Performance testing of quenched materials

[0104] The surface of the test sample of the quenched material is cleaned, and the surface, mechanical properties and organizational parameters of the quenched material after quenching at the same temperature or different temperature parameters are tested as required by the test.

[0105] The following lists the samples of thin steel plate materials after quenching and cooling in the quenching cooling device.

[0106] (1) Figure 5 As shown in Table 2, the mechanical tensile samples of the same grade of cold-rolled sheet material, i.e., cold-rolled hot-formed steel-LG1500, after quenching under the process conditions of different target heating temperatures and holding heating times shown in Table 2 can realize the complete production and quenching treatment of the test specimens, and can be used to detect and compare the surface quality, mechanical properties and organization of the same type of material LG1500 after quenching.

[0107] Table 2

[0108] Test sample Target temperature / ℃ Insulation heating time / s 1 960 200 2 960 300 3 940 200 4 940 300 5 930 200 6 930 300 7 920 300 8 910 300 9 900 300

[0109] (2) Figure 6 As shown in the figure, samples of cold-rolled sheet materials with the same specifications and grades of LG500, LG1000, LG1500 and LG2000 after quenching have no rebound deformation and cracking on the surface, which can be used to detect and compare the surface quality, mechanical properties and organization of different materials after quenching.

[0110] (3) Figure 7 As shown, the red frame is the mark of the polished surface 13 on the pressing plate 12, which is printed on the polished surface 13 of the cold rolled sheet sample after the pressure holding and quenching treatment. Therefore, the scratches 14, inclusions and other invisible defects of the cold rolled sheet after quenching can be displayed using the polished surface 13 of the backing plate or the pressing plate of the quenching device.

[0111] Figures 5 to 7The test results show that the quenching and cooling device of the embodiment of the present application can quench different hot-formed cold-rolled steels, so as to quickly and effectively test the materials to be quenched and shorten the cycle of obtaining the test results of the test specimens. It does not require the use of special quenching equipment, is easy to operate, and can prevent the problems of high-strength steel and thin-gauge steel plates as materials to be quenched from easily generating rebound and cracking.

[0112] The above is only a specific implementation method of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application.

Claims

1. A quenching cooling device, characterized in that: include: Heating device, A quenching device (1) comprises a backing plate (11) and a pressing plate (12); the pressing plate (12) is movably arranged on the backing plate (11), and the pressing plate (12) and the backing plate (11) can be arranged at a first preset distance to clamp a material to be quenched and perform pressure-maintaining quenching on the material to be quenched.

2. The quenching cooling device according to claim 1, characterized in that: Meet one or more of the following requirements: The cooling rate of the pad and the pressing plate is 30°C / min to 50°C / min; The first preset distance is equal to the thickness of the material to be quenched; The backing plate (11) and the pressing plate (12) are both made of low-multiple sample continuous casting slabs produced by a conventional continuous casting machine of a 210 converter plant.

3. The quenching cooling device according to claim 1, characterized in that: Meet at least one of the following requirements: The surfaces of the pressing plate and the backing plate in contact with the material to be quenched are polished surfaces; The relative projected area of ​​the pressing plate and the backing plate is greater than or equal to 50%; The surface roughness of the polished surfaces of the pressing plate and the backing plate in contact with the material to be quenched must satisfy Ra≤0.1 μm.

4. The quenching cooling device according to claim 1, characterized in that: The backing plate (11) is provided with a first moving handle (111) for moving the backing plate, and the pressing plate (12) is provided with a second moving handle (121) for moving the pressing plate.

5. The quenching cooling device according to claim 4, characterized in that: The first movable handle (111) is arranged at the lower part of the contact surface between the backing plate (11) and the material to be quenched, and the second movable handle (121) is arranged at the upper part of the contact surface between the pressing plate (12) and the material to be quenched.

6. The quenching cooling device according to claim 5, characterized in that: The first movable handle (111) is arranged in parallel on both sides of the lower part of the contact surface between the backing plate (11) and the material to be quenched, or the first movable handle (111) surrounds the backing plate (11) and is arranged on the circumference of the lower part of the contact surface between the backing plate (11) and the material to be quenched; and / or, The second movable handle (121) is arranged in parallel on both sides of the upper part of the contact surface between the pressing plate (12) and the material to be quenched, or the second movable handle (121) surrounds the pressing plate (12) and is arranged on the circumference of the upper part of the contact surface between the pressing plate (12) and the material to be quenched.

7. A quenching method using the quenching cooling device according to any one of claims 1 to 6, characterized in that: include: The material to be quenched is subjected to a heating treatment in the heating device according to a set target time and a target temperature to obtain a heated material to be quenched; The heated material to be quenched is placed on the pad of the quenching device, and the pressure plate cover of the quenching device is used to compact the heated material to be quenched, and the heated material to be quenched is subjected to pressure-maintaining treatment for a first preset time to quench the heated material to obtain a quenched material.

8. The quenching method according to claim 7, characterized in that: The target temperature refers to that the material to be quenched is heated to 800°C to 1000°C.

9. The quenching method according to claim 7, characterized in that: The step of using the pressing plate cover of the quenching device to press the heated material to be quenched and performing pressure-maintaining treatment on the heated material to be quenched comprises: Applying a first preset pressure to the heated material to be quenched so that the backing plate and the pressing plate are tightly connected to the heated material to be quenched; The backing plate and the pressing plate maintain a first preset pressure on the heated material to be quenched for a first preset time to perform a quenching treatment to cool the heated material to be quenched to room temperature, thereby obtaining a quenched material.

10. The quenching method according to claim 9, characterized in that: Meet at least one of the following requirements: The first preset pressure is 1500Pa to 2500Pa; The cooling rate of the quenching treatment is 30°C / min to 50°C / min; The room temperature is 15° C. to 35° C., and the first preset time is the time required for the temperature of the heated material to be quenched to drop to the room temperature.

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