A gradient heating device and method for titanium / austenitic stainless steel composite plate

Abstract

The present invention relates to the technical field of metal composite material processing, and discloses a gradient heating device and method for a titanium / austenitic stainless steel composite plate, comprising a first support frame on which a heating box is provided; a second support frame is arranged in the heating box; a pair of clamps is used to clamp the titanium-steel composite plate, and the pair of clamps are respectively provided with a positive electrode interface and a negative electrode interface; a pulse power supply is connected to the positive electrode interface and the negative electrode interface; a pressing plate is slidably arranged on the second support frame, and the pressing plate is used to abut against the steel side of the titanium-steel composite plate; a magnetic field generator is arranged on the second support frame; a cooling plate is arranged on the first support frame, and the cooling plate is used to abut against the titanium side of the titanium-steel composite plate, a coolant flows in the cooling plate, and the cooling plate is connected to a coolant circulation condensation system. The present invention can improve bonding performance, antioxidant performance, and corrosion resistance, enhance the diffusion capacity of elements near the interface, and achieve high-strength composite of the titanium-steel composite plate.

Description

Technical Field

[0001] The present invention relates to the technical field of metal composite material processing, in particular to a gradient heating device and method for a titanium / austenitic stainless steel composite plate. Background Art

[0002] Combining titanium with other metal materials to create composite materials not only leverages titanium's unique advantages but also reduces costs, representing a major trend in the rational utilization of titanium. Stainless steel is a reliable, high-strength, low-cost structural material with excellent corrosion resistance and low-temperature, processability, and weldability. However, in high-temperature, high-humidity environments like oceans and oil wells, where chloride ions are present, high temperatures and salt spray can easily damage the passive film on the stainless steel surface, causing pitting and crevice corrosion, reducing the stainless steel's service life. Titanium / austenitic stainless steel composite plates combine the performance advantages of both materials while reducing material costs. They will gradually become a substitute for titanium alone and have excellent development prospects.

[0003] Annealing can effectively reduce the work hardening phenomenon and residual stress of metal materials. Traditional annealing mostly uses a heating furnace to heat the plate to a single temperature and then anneal. Among them, the solution heat treatment of austenitic stainless steel (the heating temperature range is generally 950℃~1050℃) aims to improve corrosion resistance and obtain an austenitic structure supersaturated with carbon by heating the alloy to a high-temperature single-phase region, maintaining it for a certain time. This process is crucial for improving the mechanical properties and corrosion resistance of austenitic stainless steel. Stress relief annealing of titanium (usually between 450 and 650℃) is mainly used to eliminate the internal stress generated by titanium and titanium alloys during processing, and to avoid cracking and damage caused by internal stress during use. It can be seen that, however, the annealing temperatures of titanium and stainless steel are different. Heating the titanium / austenitic stainless steel composite plate to a single temperature for annealing greatly affects the performance of the composite plate. Annealing titanium / austenitic stainless steel composite plates at titanium's annealing temperature results in insufficient heating temperature on the stainless steel side. In the low-temperature annealing range, the stainless steel grain size and hardness do not change significantly, resulting in an excessively low heating temperature at the composite interface. This leads to insufficient hardness reduction and strength improvement on the steel side, deteriorating the interface bonding performance. The stainless steel annealing temperature is around 900°C. Titanium's phase transition point is approximately 882°C. Heating titanium at the austenitic stainless steel heating temperature causes a phase transition from a close-packed hexagonal structure to a body-centered cubic structure, while also causing the composite interface heating temperature to be too high. When the annealing temperature exceeds 600°C, the titanium grains grow significantly and the hardness decreases significantly. When the interface annealing temperature is too high, the connection between the grains weakens, brittle-hard compounds form at the interface, and deteriorates the interface bonding performance. Therefore, it is necessary to heat the austenitic stainless steel side, the titanium side, and the interface side at different temperatures, i.e., gradient heating. Consequently, there is an urgent need for a gradient heating device and method for titanium / austenitic stainless steel composite plates. Summary of the Invention

[0004] The object of the present invention is to provide a gradient heating device and method for titanium / austenitic stainless steel composite plates, aiming to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides a gradient heating device for titanium / austenitic stainless steel composite plates, comprising:

[0006] a first support frame, on which a heating box is provided;

[0007] A second support frame is arranged in the heating box;

[0008] A pair of clamps are relatively slidably disposed in the heating box, the pair of clamps are used to clamp the titanium-steel composite plate, and the pair of clamps are respectively provided with a positive electrode interface and a negative electrode interface;

[0009] A pulse power supply is provided on the heating box, and the pulse power supply is connected to the positive electrode interface and the negative electrode interface;

[0010] a pressing plate slidably disposed on the second supporting frame, the pressing plate being used to abut against the steel side surface of the titanium-steel composite plate;

[0011] a magnetic field generator, disposed on the second support frame, the magnetic field generator being connected to the pulse power supply;

[0012] A cooling plate is provided on the first support frame. The cooling plate is used to abut against the titanium side surface of the titanium-steel composite plate. Coolant flows in the cooling plate. The cooling plate is connected to a coolant circulation condensation system.

[0013] Optionally, it further includes an air source, the air source is connected to a vent through a pipeline, and the vent is connected to the inner cavity of the heating box.

[0014] Optionally, a first thermometer is further included, which is arranged in the heating box and is used to obtain the temperature of the titanium side of the titanium-steel composite plate.

[0015] Optionally, a second thermometer is further included, which is arranged in the heating box and is used to obtain the temperature of the steel side of the titanium-steel composite plate.

[0016] Optionally, a pair of first slide rails are provided on the second support frame, a sliding frame is slidably connected between the pair of first slide rails, the sliding frame is provided with a first motor for driving the sliding frame to slide along the pair of first slide rails, and the sliding frame is connected to the pressure plate through a connecting frame.

[0017] Optionally, a pair of limiters are provided on the second support frame, and the pair of limiters are used to limit the sliding range of the sliding frame.

[0018] Optionally, a pair of second slide rails are provided on the second support frame, a pair of the clamps are slidably connected to the pair of second slide rails, and the clamps are provided with a second motor for driving the clamps to slide along the pair of second slide rails.

[0019] Optionally, the cooling plate includes a plate body having a flow groove, a sealing ring arranged on the plate body, and a plate cover connected to the plate body, and the flow groove in the plate body is connected to the coolant circulation condensation system.

[0020] Optionally, the coolant circulation condensation system includes a compressor, the outlet of the compressor is connected to the first condenser, the second condenser, the pressure compensator and the capillary tube in sequence through pipelines, the capillary tube is connected to the inlet of the flow tank through a pipeline, and the outlet of the flow tank is connected to the inlet of the compressor through a pipeline.

[0021] A gradient heating method for a titanium / austenitic stainless steel composite plate comprises the following steps:

[0022] The titanium-steel composite plate is clamped and fixed by a pair of the clamps, and at the same time, the steel side of the titanium-steel composite plate abuts against the pressure plate, and the titanium side abuts against the cooling plate;

[0023] The current generated by the pulse power supply is transmitted to the pair of the clamps through the positive electrode interface and the negative electrode interface, so that the pair of the clamps heat the titanium-steel composite plate;

[0024] Changing the current distribution inside the titanium-steel composite plate by the magnetic field generator so that the current is concentrated toward the bonding interface between the steel side and the titanium side away from the titanium-steel composite plate;

[0025] The coolant is caused to flow in the cooling plate through the coolant circulation condensation system, so that the cooling plate cools down the titanium side of the titanium-steel composite plate.

[0026] The present invention discloses the following technical effects: after a titanium-steel composite plate is clamped by a pair of clamps, the steel side of the titanium-steel composite plate is made to abut against the pressure plate, and the titanium side is made to abut against the cooling plate, the position of the titanium-steel composite plate is fixed, and the current is transmitted from the positive electrode interface and the negative electrode interface to the pair of clamps through a pulse power supply, so that the pair of clamps heats the titanium-steel composite plate, and the magnetic field generator adjusts the magnetic field size and the direction and size of the current so that the current is concentrated toward the steel side and the titanium side bonding interface away from the titanium-steel composite plate, so that the temperature of the steel side and the titanium side of the titanium-steel composite plate are finally at a high level, and at the same time, the cooling liquid circulation condensation system reduces the temperature of the titanium side of the titanium-steel composite plate by a certain level through the cooling plate, so that it reaches a preset temperature, and realizes precise control of the bonding interface temperature, thereby realizing current gradient heating of the titanium-steel composite plate, greatly reducing the generation of hard and brittle compounds at the bonding interface, thereby improving the bonding performance, oxidation resistance, and corrosion resistance, and enhancing the diffusion capacity of elements near the interface, so as to realize high-strength bonding of the titanium-steel composite plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal structure of the heating box of the present invention;

[0030] Figure 3 It is a schematic diagram of the partial structure of the second support frame of the present invention;

[0031] Figure 4 This is a schematic diagram of the cooling plate structure of the present invention;

[0032] Figure 5 Schematic diagram of the internal structure of the cooling plate of the present invention.

[0033] In the figure: 1. First support frame; 2. Heating box; 3. Second support frame; 4. Clamp; 5. Positive electrode interface; 6. Negative electrode interface; 7. Pulse power supply; 8. Press plate; 9. Magnetic field generator; 10. Cooling plate; 101. Flow trough; 102. Plate body; 103. Sealing ring; 104. Plate cover; 11. Gas source; 12. Vent; 13. First thermometer; 14. Second thermometer; 15. First slide rail; 16. Slide frame; 17. First motor; 18. Limiter; 19. Second slide rail; 20. Second motor; 21. Compressor; 22. First condenser; 23. Second condenser; 24. Pressure compensator; 25. Capillary; 26. Protective door. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Reference Figure 1-Figure 5 The present invention provides a gradient heating device for titanium / austenitic stainless steel composite plates, comprising:

[0037] A first support frame 1, on which a heating box 2 is provided;

[0038] The second support frame 3 is arranged in the heating box 2;

[0039] A pair of clamps 4 are relatively slidably disposed in the heating box 2, and the pair of clamps 4 are used to clamp the titanium-steel composite plate. The pair of clamps are respectively provided with a positive electrode interface 5 and a negative electrode interface 6;

[0040] The pulse power supply 7 is provided on the heating box 2 and is connected to the positive electrode interface 5 and the negative electrode interface 6;

[0041] A pressing plate 8 is slidably disposed on the second support frame 3, and the pressing plate 8 is used to abut against the steel side surface of the titanium-steel composite plate;

[0042] A magnetic field generator 9 is provided on the second support frame 3 and is connected to the pulse power supply 7;

[0043] The cooling plate 10 is provided on the first support frame 1 and is used to abut against the titanium side surface of the titanium-steel composite plate. Coolant flows in the cooling plate 10 and the cooling plate 10 is connected to a coolant circulation condensation system.

[0044] After the titanium-steel composite plate is clamped by a pair of clamps 4, the steel side of the titanium-steel composite plate is made to abut against the pressure plate 8, and the titanium side is made to abut against the cooling plate 10, the position of the titanium-steel composite plate is fixed, and the current is transmitted from the positive electrode interface 5 and the negative electrode interface 6 to the pair of clamps 4 through the pulse power supply 7, so that the pair of clamps 4 heats the titanium-steel composite plate, and the magnetic field generator 9 adjusts the magnetic field size and the direction and size of the current so that the current is concentrated toward the steel side and titanium side bonding interface away from the titanium-steel composite plate, and finally the steel side temperature and the titanium side temperature of the titanium-steel composite plate are at a higher level. At the same time, the cooling liquid circulation condensation system reduces the temperature of the titanium side of the titanium-steel composite plate by a certain amount through the cooling plate 10 to reach the preset temperature, and realizes precise control of the bonding interface temperature, thereby realizing current gradient heating of the titanium-steel composite plate, greatly reducing the generation of hard and brittle compounds at the bonding interface, so as to improve the bonding performance, oxidation resistance, and corrosion resistance, enhance the diffusion capacity of elements near the interface, and realize high-strength composite of the titanium-steel composite plate.

[0045] Furthermore, a protective door 26 that can be opened and closed is provided on the side wall of the heating box 2 .

[0046] Furthermore, the magnetic field generator 9 is a rectangular Helmholtz coil magnetic field generator.

[0047] A further optimized solution also includes an air source 11 , which is connected to a vent 12 through a pipeline, and the vent 12 is connected to the inner cavity of the heating box 2 .

[0048] Inert gas is continuously introduced into the heating box 2 through the gas source 11 and the vent 12 to prevent oxidation of the composite board during the heating process.

[0049] A further optimized solution further includes a first thermometer 13 , which is disposed in the heating box 2 . The first thermometer 13 is used to obtain the temperature of the titanium side surface of the titanium-steel composite plate.

[0050] A further optimized solution further includes a second thermometer 14, which is arranged in the heating box 2. The second thermometer 14 is used to obtain the temperature of the steel side of the titanium-steel composite plate.

[0051] The first thermometer 13 and the second thermometer 14 are used to monitor and feedback the current of the magnetic field generator 9 and the current of the clamp 4, and adjust the pressure compensator 24 to compensate the pressure through temperature monitoring feedback, thereby adjusting the temperature of the titanium side and the steel side of the titanium-steel composite plate to the preset value.

[0052] Furthermore, the first thermometer 13 and the second thermometer 14 are infrared thermometers.

[0053] To further optimize the solution, a pair of first slide rails 15 are provided on the second support frame 3, a sliding frame 16 is slidably connected between the pair of first slide rails 15, and a first motor 17 is provided on the sliding frame 16 for driving the sliding frame 16 to slide along the pair of first slide rails 15, and the sliding frame 16 is connected to the pressure plate 8 through a connecting frame.

[0054] The first motor 17 drives the sliding frame 16 to slide along the first slide rail 15 , thereby driving the pressing plate 8 to move through the connecting frame, thereby achieving the downward pressing action of the pressing plate 8, so that the titanium steel composite plate and the cooling plate 10 are tightly combined.

[0055] As a further optimization solution, a pair of limiters 18 are provided on the second support frame 3 , and the pair of limiters 18 are used to limit the sliding range of the sliding frame 16 .

[0056] A pair of limiters 18 are used to achieve safety protection of the sliding frame 16 when it is pressed down.

[0057] A further optimized solution is that a pair of second slide rails 19 are provided on the second support frame 3, a pair of clamps 4 are slidably connected to the pair of second slide rails 19, and a second motor 20 is provided on the clamp 4 for driving the clamp 4 to slide along the pair of second slide rails 19.

[0058] The second motor 20 drives the clamp 4 to slide along the pair of second slide rails 19, so that the pair of clamps 4 can clamp the titanium-steel composite plate and heat the titanium-steel composite plates of different sizes.

[0059] Furthermore, the material of the clamp 4 is copper.

[0060] According to a further optimization scheme, the cooling plate 10 includes a plate body 102 having a flow groove 101, a sealing ring 103 arranged on the plate body 102, and a plate cover 104 connected to the plate body 102. The flow groove 101 in the plate body 102 is connected to the coolant circulation condensation system.

[0061] To further optimize the solution, the coolant circulation condensation system includes a compressor 21, the outlet of the compressor 21 is connected to the first condenser 22, the second condenser 23, the pressure compensator 24 and the capillary 25 through pipelines in sequence, the capillary 25 is connected to the inlet of the flow tank 101 through a pipeline, and the outlet of the flow tank 101 is connected to the inlet of the compressor 21 through a pipeline.

[0062] The compressor 21 introduces the refrigerant, which dissipates heat through the first condenser 22 and the second condenser 23, and is throttled and cooled by the capillary 25. The pressure is compensated by the pressure compensator 24, so that the refrigerant circulates in the flow groove 101, thereby achieving cooling of the contact titanium side through the cooling plate 10 to reach the preset titanium side temperature.

[0063] A gradient heating method for a titanium / austenitic stainless steel composite plate comprises the following steps:

[0064] The second motor 20 drives the clamp 4 to slide along the second slide rail 19, and the titanium-steel composite plate is clamped and fixed by a pair of clamps 4. At the same time, the first motor 17 drives the sliding frame 16 to slide along the first slide rail 15, so that the pressing plate 8 tightly presses the titanium-steel composite plate, so that the titanium side of the titanium-steel composite plate is tightly attached to the cooling plate 10, so that the steel side of the titanium-steel composite plate abuts against the pressing plate 8, and the titanium side abuts against the cooling plate 10;

[0065] The current generated by the pulse power supply 7 is transmitted to the pair of clamps 4 through the positive electrode interface 5 and the negative electrode interface 6, so that the pair of clamps 4 heats the titanium steel composite plate;

[0066] The magnetic field strength of the magnetic field generator 9 is adjusted by the pulse power supply 7, thereby changing the current distribution inside the titanium-steel composite plate through the magnetic field generator 9, so that the current is concentrated toward the bonding interface between the steel side and the titanium side away from the titanium-steel composite plate; the current density on the steel side and the titanium side is increased, and the temperature on the steel side and the titanium side is increased to reach the preset temperature on the steel side.

[0067] The coolant is made to flow in the cooling plate 10 through the coolant circulation condensation system, so that the cooling plate 10 cools down the titanium side of the titanium-steel composite plate.

[0068] After the heating is completed, the movable protective door 26 is opened, the pressing plate 8 is lifted, the clamp 4 moves in the opposite direction, the pulse power supply 7 is turned off, and the titanium-steel composite plate is taken out.

[0069] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0070] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A gradient heating device for titanium / austenitic stainless steel composite plates, characterized in that: include: A first support frame (1) on which a heating box (2) is arranged; A second support frame (3) is arranged in the heating box (2); A pair of clamps (4) are relatively slidably arranged in the heating box (2), the pair of clamps (4) are used to clamp the titanium-steel composite plate, and the pair of clamps are respectively provided with a positive electrode interface (5) and a negative electrode interface (6); A pulse power supply (7) is provided on the heating box (2), and the pulse power supply (7) is connected to the positive electrode interface (5) and the negative electrode interface (6); A pressing plate (8) is slidably arranged on the second support frame (3), and the pressing plate (8) is used to abut against the steel side surface of the titanium-steel composite plate; A magnetic field generator (9) is arranged on the second support frame (3), and the magnetic field generator (9) is connected to the pulse power supply (7); A cooling plate (10) is arranged on the first support frame (1), the cooling plate (10) is used to abut against the titanium side surface of the titanium-steel composite plate, a coolant flows in the cooling plate (10), and the cooling plate (10) is connected to a coolant circulation condensation system.

2. The gradient heating device for titanium / austenitic stainless steel composite plate according to claim 1, characterized in that: It also includes an air source (11), the air source (11) is connected to a vent (12) through a pipeline, and the vent (12) is connected to the inner cavity of the heating box (2).

3. The gradient heating device for titanium / austenitic stainless steel composite plates according to claim 1, characterized in that: It also includes a first thermometer (13) disposed in the heating box (2), and the first thermometer (13) is used to obtain the temperature of the titanium side surface of the titanium-steel composite plate.

4. The gradient heating device for titanium / austenitic stainless steel composite plates according to claim 1, characterized in that: It also includes a second temperature measuring instrument (14) which is arranged in the heating box (2), and the second temperature measuring instrument (14) is used to obtain the temperature of the steel side surface of the titanium-steel composite plate.

5. The gradient heating device for titanium / austenitic stainless steel composite plate according to claim 1, characterized in that: A pair of first slide rails (15) are provided on the second support frame (3), a sliding frame (16) is slidably connected between the pair of first slide rails (15), a first motor (17) is provided on the sliding frame (16) for driving the sliding frame (16) to slide along the pair of first slide rails (15), and the sliding frame (16) is connected to the pressure plate (8) through a connecting frame.

6. The gradient heating device for titanium / austenitic stainless steel composite plates according to claim 5, characterized in that: A pair of limiters (18) is provided on the second support frame (3), and the pair of limiters (18) are used to limit the sliding range of the sliding frame (16).

7. The gradient heating device for titanium / austenitic stainless steel composite plates according to claim 1, characterized in that: A pair of second slide rails (19) are provided on the second support frame (3), a pair of the clamps (4) are slidably connected to the pair of second slide rails (19), and a second motor (20) is provided on the clamps (4) for driving the clamps (4) to slide along the pair of second slide rails (19).

8. The gradient heating device for titanium / austenitic stainless steel composite plates according to claim 1, characterized in that: The cooling plate (10) comprises a plate body (102) having a flow groove (101), a sealing ring (103) arranged on the plate body (102), and a plate cover (104) connected to the plate body (102); the flow groove (101) in the plate body (102) is connected to the coolant circulation condensation system.

9. The gradient heating device for titanium / austenitic stainless steel composite plates according to claim 8, characterized in that: The coolant circulation condensation system includes a compressor (21), the outlet of the compressor (21) is connected to a first condenser (22), a second condenser (23), a pressure compensator (24) and a capillary tube (25) in sequence through pipelines, the capillary tube (25) is connected to the inlet of the flow tank (101) through a pipeline, and the outlet of the flow tank (101) is connected to the inlet of the compressor (21) through a pipeline.

10. A gradient heating method for a titanium / austenitic stainless steel composite plate, based on the gradient heating device for a titanium / austenitic stainless steel composite plate according to any one of claims 1 to 9, characterized in that: The following steps are involved: The titanium-steel composite plate is clamped and fixed by a pair of clamps (4), and at the same time, the steel side of the titanium-steel composite plate abuts against the pressing plate (8), and the titanium side abuts against the cooling plate (10); The current generated by the pulse power supply (7) is transmitted to the pair of the clamps (4) through the positive electrode interface (5) and the negative electrode interface (6), so that the pair of the clamps (4) heat the titanium-steel composite plate; The magnetic field generator (9) is used to change the current distribution inside the titanium-steel composite plate so that the current is concentrated toward the bonding interface between the steel side and the titanium side away from the titanium-steel composite plate; The coolant is caused to flow in the cooling plate (10) through the coolant circulation condensation system, so that the cooling plate (10) cools the titanium side of the titanium-steel composite plate.

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