A production method of temperature-controlled bimetallic composite material

Abstract

The present application belongs to the technical field of metal composite plate manufacturing, in particular to a production method of temperature control bimetallic composite material, which comprises the following steps: hot rolling of temperature control bimetallic composite slab between corrugated rollers to obtain temperature control bimetallic composite slab with corrugated upper and lower surfaces, rotating the temperature control bimetallic composite slab with corrugated upper and lower surfaces by 90°, and rolling between flat rollers. The present application overcomes the problems of difficulty in preparation and low efficiency of existing temperature control bimetallic composite material, and can prepare high toughness and high quality temperature control bimetallic composite material by applying cumulative large deformation to the temperature control bimetallic composite material, adjusting the interface layer configuration and structure, and improving the microstructure and distribution state of the temperature control bimetallic composite material matrix layer and interface layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal composite plate manufacturing, in particular to a production method of temperature control bimetallic composite material. BACKGROUND

[0002] Temperature control bimetallic material is a functional material made of two metals or alloys with different thermal expansion coefficients. It is often made into temperature sensing elements in strip form. Its working principle is to use heat or self-heating to cause temperature rise, so that layers with different thermal expansion coefficients produce reversible bending deformation or free end displacement, and convert thermal energy into mechanical energy. This thermal actuation characteristic is widely used in automation control to realize temperature display, temperature control, temperature compensation, program control, overload protection and other functions. Temperature control bimetallic material is widely used in industrial control electrical appliances, household appliances, and ship, automobile, aviation, aerospace and weapon fields.

[0003] The existing research on the preparation technology of temperature control bimetallic composite material mainly focuses on the influence of rolling process and annealing process on the macroscopic size precision and bonding performance of each component layer, and cannot realize the precise adjustment of the microstructure of the interface layer. This situation not only limits the strength improvement of the interface layer, but also causes the fluctuation of the thickness ratio of the temperature control bimetallic layer, which directly affects the sensitivity to temperature and the application expansion of the thermal actuation behavior under the interface constraint effect. SUMMARY

[0004] To solve the problems existing in the prior art, the main purpose of the present application is to provide a production method of temperature control bimetallic composite material.

[0005] To solve the above technical problems, according to one aspect of the present application, the present application provides the following technical scheme:

[0006] A production method of temperature control bimetallic composite material, comprising the following steps:

[0007] S1, corrugated roller hot rolling

[0008] The hot rolling of the temperature control bimetallic composite slab between the corrugated rollers obtains a temperature control bimetallic composite slab with corrugated upper and lower surfaces;

[0009] S2, flat roller rolling

[0010] The temperature control bimetallic composite slab with corrugated upper and lower surfaces is rotated by 90°, and rolling is carried out between the flat rollers.

[0011] As a preferred scheme of the production method of temperature control bimetallic composite material, the step S1 comprises:

[0012] S11, hot rolling the temperature-controlled bimetal composite slab between the corrugated rollers, the inclined areas of the rolled composite slab being subjected to shear deformation, and the highest and lowest points of the rolled composite slab being subjected to tensile strain;

[0013] S12, moving the temperature-controlled bimetal composite slab axially along the corrugated rollers by a certain distance, and again hot rolling the temperature-controlled bimetal composite slab between the corrugated rollers to realize shear deformation of the highest and lowest points of the composite slab subjected to tensile strain in step S11.

[0014] As a preferred scheme of the production method of the temperature-controlled bimetal composite material, the step S1 further comprises:

[0015] S13, repeatedly step S12 multiple times to ensure that the shear deformation is uniformly distributed throughout the composite slab.

[0016] As a preferred scheme of the production method of the temperature-controlled bimetal composite material, in step S11, the temperature-controlled bimetal composite slab is heated in a heating furnace before hot rolling.

[0017] As a preferred scheme of the production method of the temperature-controlled bimetal composite material, in step S12, the temperature-controlled bimetal composite slab moves axially along the corrugated rollers by a distance less than the wavelength of the corrugated rollers.

[0018] As a preferred scheme of the production method of the temperature-controlled bimetal composite material, the step S2 comprises:

[0019] S21, rotating the temperature-controlled bimetal composite slab by 90° and hot rolling between a pair of flat rollers;

[0020] S22, air cooling and edge cutting treatment, and then cold rolling.

[0021] As a preferred scheme of the production method of the temperature-controlled bimetal composite material, in step S21, the cumulative reduction of the flat roller hot rolling is ≥80%.

[0022] As a preferred scheme of the production method of the temperature-controlled bimetal composite material, the step S1 further comprises:

[0023] S0, preparation of the temperature-controlled bimetal composite slab

[0024] The surfaces to be combined of the composite slab are polished and cleaned, and after stacking, four-seal welding is performed.

[0025] As a preferred scheme of the production method of the temperature-controlled bimetal composite material, the step S2 further comprises:

[0026] S3, heat treatment

[0027] The warm control bimetal composite plate blank after rolling is subjected to heat treatment.

[0028] As a preferred scheme of the production method of the warm control bimetal composite material, in the step S3, the heat treatment comprises solid solution treatment and aging treatment.

[0029] The beneficial effects of the present application are as follows:

[0030] The present application provides a production method of a warm control bimetal composite material, which obtains a warm control bimetal composite plate blank with corrugated upper and lower surfaces by hot rolling the warm control bimetal composite plate blank between corrugated rollers, rotates the warm control bimetal composite plate blank with corrugated upper and lower surfaces by 90°, and rolls between flat rollers. The present application overcomes the problems of difficult preparation and low efficiency of the existing warm control bimetal composite material, and can prepare a high-quality warm control bimetal composite material with high strength and toughness by applying cumulative large deformation to the warm control bimetal composite material, accurately adjusting the interfacial layered structure, and improving the microstructure and distribution state of the substrate layer and the interfacial layer of the warm control bimetal composite material. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments will be described below in a clear and complete manner. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0032] The present application provides a production method of a warm control bimetal composite material, which utilizes the transverse bending cumulative deformation of corrugated rollers and flat rollers to realize uniform shearing and bending deformation of the composite plate, increases the deformation amount, causes plastic deformation of the composite interface, promotes the dispersion of impurities and the cleanliness of the interface, refines the grain size of the plate, and improves the mechanical properties and interface strength of the composite material.

[0033] According to one aspect of the present application, the present application provides the following technical solutions:

[0034] A production method of a warm control bimetal composite material, comprising the following steps:

[0035] S1, corrugated roller hot rolling

[0036] The warm control bimetal composite plate blank is hot rolled between corrugated rollers to obtain a warm control bimetal composite plate blank with corrugated upper and lower surfaces;

[0037] S2, flat roller rolling

[0038] The temperature-controlled bimetallic composite slab with corrugated upper and lower surfaces is rotated by 90° and rolled between flat rollers to flatten the composite slab.

[0039] Preferably, the step S1 comprises:

[0040] S11, hot rolling the temperature-controlled bimetallic composite slab between corrugated rollers, the inclined regions of the composite slab after rolling are subjected to shear deformation, and the highest and lowest points of the composite slab after rolling are subjected to tensile strain;

[0041] S12, moving the temperature-controlled bimetallic composite slab a certain distance along the axis of the corrugated rollers, and again hot rolling the temperature-controlled bimetallic composite slab between the corrugated rollers to realize shear deformation of the highest and lowest points of the composite slab subjected to tensile strain in step S11.

[0042] Preferably, the step S1 further comprises:

[0043] S13, repeatedly step S12 multiple times to ensure that the shear deformation is uniformly distributed throughout the composite slab.

[0044] Preferably, in step S11, the temperature-controlled bimetallic composite slab is heated in a heating furnace before hot rolling.

[0045] Preferably, in step S12, the temperature-controlled bimetallic composite slab moves a distance along the axis of the corrugated rollers that is less than the wavelength of the corrugated rollers.

[0046] Preferably, the step S2 comprises:

[0047] S21, rotating the temperature-controlled bimetallic composite slab by 90° and hot rolling between a pair of flat rollers;

[0048] S22, air cooling and edge cutting treatment, and then cold rolling.

[0049] Preferably, in step S21, the cumulative reduction rate of flat roller hot rolling is ≥80%.

[0050] Preferably, the step S1 further comprises:

[0051] S0, preparation of the temperature-controlled bimetallic composite slab

[0052] The surfaces to be combined of the composite slab are polished and cleaned, and after stacking, the four sides are sealed and welded.

[0053] Preferably, the step S2 further comprises:

[0054] S3, heat treatment

[0055] The temperature-controlled bimetallic composite slab after rolling is subjected to heat treatment.

[0056] Preferably, the heat treatment in step S3 comprises solution treatment and aging treatment.

[0057] Embodiment

[0058] A production method of temperature control bimetallic composite material, which realizes the production of Mn72Ni10Cu18 and Ni36 temperature control bimetallic composite plates, comprises the following steps:

[0059] S0, preparation of temperature control bimetallic composite plate blank

[0060] The surface to be compounded of the composite plate blank is polished and cleaned, and after stacking, four-seal welding is performed.

[0061] A Mn72Ni10Cu18 / Ni36 composite plate with a size of 2000mm×1000mm is selected as a blank, the surface to be compounded of the composite plate is polished by a belt sander to remove the oxide scale and make it leak out the metal luster, then the composite surface is cleaned with a dilute acid solution and an alcohol solution in sequence, and after cleaning, it is blown dry with airflow to ensure that the surface to be compounded is not contaminated. Then the composite plate blank is stacked, and the composite plate blank is four-seal welded.

[0062] S1, corrugated roller hot rolling

[0063] The hot rolling of the temperature control bimetallic composite plate blank between the corrugated rollers obtains a temperature control bimetallic composite plate blank with corrugated surfaces on the upper and lower surfaces;

[0064] S11, the composite plate blank is sent into a heating furnace for heating, the heating temperature ranges from 1200 to 1250℃; the hot rolling of the temperature control bimetallic composite plate blank between the corrugated rollers is performed, the inclined area of the composite plate blank after rolling is subjected to shear deformation, and the highest point and the lowest point of the composite plate blank after rolling are subjected to tensile strain;

[0065] S12, the temperature control bimetallic composite plate blank is moved along the axial direction of the corrugated roller by 1 / 4 of the wavelength of the corrugated roller, and the hot rolling of the temperature control bimetallic composite plate blank between the corrugated rollers is performed again to realize the shear deformation of the highest point and the lowest point of the composite plate blank subjected to tensile strain in step S11;

[0066] S13, step S12 is repeated multiple times to ensure that the shear deformation is uniformly distributed in the entire composite plate blank.

[0067] S2, flat roller rolling

[0068] The temperature control bimetallic composite plate blank with corrugated surfaces on the upper and lower surfaces is rotated by 90°, and rolling is performed between flat rollers;

[0069] S21, the temperature control bimetallic composite plate blank is rotated by 90°, and hot rolling is performed between a pair of flat rollers, and the cumulative reduction of the flat roller hot rolling is ≥80%;

[0070] S22, air cooling and trimming are performed, and the composite plate is cold-rolled twice, the first cold rolling has a cumulative reduction of 60%, and then annealing treatment is performed at 840℃ for 10min, and then the second cold rolling is performed, and the cumulative reduction is 45%.

[0071] S3, heat treatment

[0072] The warm-control bimetal composite plate blank after rolling is subjected to heat treatment, first, solid solution treatment is performed at a temperature of 1050℃, then, aging treatment is performed at 800℃, and then pickling is performed.

[0073] The thermal expansion coefficient of the Mn72Ni10Cu18 layer of the warm-control bimetal composite material prepared in this embodiment is 18.5×10 -6 / ℃, the thermal expansion coefficient of the Ni36 layer is 11.2×10 -6 / ℃, and the difference between the two is 7.3×10 -6 / ℃, which is much higher than the difference of the traditional warm-control bimetal composite material (generally between 2-4×10 -6 / ℃), indicating that the warm-control bimetal composite material prepared in this embodiment has stronger temperature sensitivity and deformation ability;

[0074] The bending strength of the warm-control bimetal composite material prepared in this embodiment at room temperature is 450MPa, which is higher than the bending strength of the traditional warm-control bimetal composite material (generally between 200-300MPa), indicating that the warm-control bimetal composite material prepared in this embodiment has higher strength and toughness and reliability;

[0075] The fatigue life of the warm-control bimetal composite material prepared in this embodiment is >10 7 times, which is higher than the fatigue life of the traditional warm-control bimetal composite material (generally between 10 5 -10 6 times), indicating that the warm-control bimetal composite material prepared in this embodiment has better durability and stability.

[0076] The warm-control bimetal composite plate blank is hot-rolled between corrugated rollers to obtain a warm-control bimetal composite plate blank with corrugated upper and lower surfaces, and the warm-control bimetal composite plate blank with corrugated upper and lower surfaces is rotated by 90° and rolled between flat rollers; The problems of difficult preparation and low efficiency of the existing warm-control bimetal composite material are overcome, and by applying cumulative large deformation to the warm-control bimetal composite material, the interface layer structure and its structure are accurately adjusted, the microstructure and distribution state of the warm-control bimetal composite material substrate layer and the interface layer are improved, and a strong and tough warm-control bimetal composite material with high quality can be prepared. The process of this embodiment is simple, only one process is needed to realize the preparation of the bimetallic sheet, which saves time and cost, improves efficiency and quality.

[0077] The above merely describes the preferred embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural variations or direct / indirect applications in other related technical fields based on the content of the present application description are included in the patent protection scope of the present application.

Claims

1. A method for producing a temperature-controlled bimetallic composite material, realizing the production of Mn72Ni10Cu18 and Ni36 temperature-controlled bimetallic composite materials, comprising the following steps: S1, Corrugated Roll Hot Rolling Temperature-controlled bimetallic composite slabs are obtained by hot rolling temperature-controlled bimetallic composite slabs between corrugated rolls, with both the top and bottom surfaces being corrugated. S11. The composite slab is fed into a heating furnace for heating, with a heating temperature range of 1200~1250℃. The temperature-controlled bimetallic composite slab is hot-rolled between corrugated rolls. The inclined area of ​​the composite slab after rolling is subjected to shear deformation, and the highest and lowest points of the composite slab after rolling are subjected to tensile strain. S12. Move the temperature-controlled bimetallic composite slab along the axial direction of the corrugated roll by 1 / 4 of the wavelength of the corrugated roll, and perform hot rolling of the temperature-controlled bimetallic composite slab between the corrugated rolls again to achieve shear deformation at the highest and lowest points of the composite slab subjected to tensile strain in step S11. S13. Repeat step S12 multiple times to ensure that the shear deformation is evenly distributed throughout the composite slab. S2, Flat Roll Rolling The temperature-controlled bimetallic composite slab, which has corrugated surfaces on both the top and bottom, is rotated 90° and rolled between flat rolls. S21. Rotate the temperature-controlled bimetallic composite slab 90° and hot roll it between a pair of flat rolls, with a cumulative reduction rate of ≥80% during hot rolling. S22. Perform air cooling and edge trimming treatment, and then perform two cold rolling processes on the composite plate. The cumulative reduction rate of the first cold rolling is 60%. After annealing at 840℃ for 10 minutes, the plate is then subjected to a second cold rolling process with a cumulative reduction rate of 45%. S3, Heat Treatment The rolled temperature-controlled bimetallic composite slab is subjected to heat treatment. First, it is subjected to solution treatment at 1050℃, then aging treatment at 800℃, and pickling. The coefficient of thermal expansion of the Mn72Ni10Cu18 layer in the temperature-controlled bimetallic composite material is 18.5 × 10⁻⁶. -6 At ℃, the coefficient of thermal expansion of the Ni36 layer is 11.2 × 10⁻⁶. -6 / ℃, the difference between the two is 7.3×10 -6 / ℃; the flexural strength of the temperature-controlled bimetallic composite material at room temperature is 450MPa; the fatigue life of the temperature-controlled bimetallic composite material is >10 7 Second-rate.