Gradient heating equipment and method for titanium / austenitic stainless steel composite plate

Abstract

The invention relates to the technical field of metal composite material machining, and discloses a gradient heating device and method for a titanium / austenitic stainless steel composite plate, and the gradient heating device comprises a first supporting frame which is provided with a heating box; the second support frame is arranged in the heating box; the pair of clamps is used for clamping the titanium steel composite plate, and a positive electrode interface and a negative electrode interface are respectively formed in the pair of clamps; the pulse power supply is connected with the anode interface and the cathode interface; the pressing plate is arranged on the second supporting frame in a sliding mode and used for abutting against the steel side face of the titanium-steel composite plate. The magnetic field generator is arranged on the second support frame; the cooling plate is arranged on the first supporting frame, the cooling plate is used for abutting against the titanium side face of the titanium-steel composite plate, cooling liquid flows in the cooling plate, and the cooling plate communicates with a cooling liquid circulating condensation system. And high-strength compounding of the titanium-steel composite plate is realized.

Description

Technical Field

[0001] The invention relates to the technical field of metal composite material processing, and 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 prepare composite materials can not only give full play to the unique advantages of titanium but also reduce costs, which is a general trend of the rational use of titanium. Stainless steel is a reliable, high-strength, low-cost structural material with good corrosion resistance and excellent low-temperature performance, processing performance and welding performance. However, in high-temperature, high-humidity environments such as oceans and oil wells where chloride ions exist, high temperature and salt spray can easily destroy the passivation film on the surface of stainless steel, causing pitting and crevice corrosion, reducing the service life of stainless steel. Titanium / austenitic stainless steel composite plates have the performance advantages of both materials, while reducing material costs, and will gradually become a substitute for single titanium materials, with good 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 the corrosion resistance and obtain an austenite structure supersaturated with carbon by heating the alloy to a high temperature single-phase region, keeping it for a certain time to allow the intermediate phase to fully dissolve into the solid solution, and then cooling it rapidly. This process is crucial to 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 avoid cracking and damage caused by the existence of internal stress during use. It can be seen that 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 the titanium / austenitic stainless steel composite plate at the annealing temperature of titanium will result in insufficient heating temperature on the stainless steel side. In the low-temperature annealing range, the stainless steel grains and hardness do not change significantly, which will cause the composite interface heating temperature to be too low, resulting in insufficient hardness reduction and insufficient strength improvement on the steel side, and deteriorating the interface bonding performance. The annealing temperature of stainless steel is around 900 degrees. The phase transition point of titanium is about 882°C. When titanium is heated at the heating temperature of austenitic stainless steel, titanium will undergo a phase transition, and titanium will change from a close-packed hexagonal structure to a body-centered cubic structure, and at the same time, the composite interface heating temperature will be too high. When the annealing temperature is higher than 600°C, the titanium grains grow significantly and the hardness decreases significantly. When the annealing temperature of the bonding interface is too high, the connection between the grains becomes weak, and brittle and hard compounds are generated at the bonding interface, which deteriorates the interface bonding performance. Therefore, it is necessary to heat the austenitic stainless steel side, the titanium side, and the bonding interface side at different temperatures, that is, gradient heating. Therefore, a gradient heating device and method for titanium / austenitic stainless steel composite plates are urgently needed. Summary of the invention

[0004] The object of the present invention is to provide a gradient heating device and method for a titanium / austenitic stainless steel composite plate, 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 a titanium / austenitic stainless steel composite plate, comprising:

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

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

[0008] A pair of clamps are relatively slidably arranged 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 arranged 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 is disposed on the second support frame, and the magnetic field generator is connected to the pulse power supply;

[0012] A cooling plate is arranged on the first support frame, the cooling plate is used to abut against the titanium side surface 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.

[0013] Optionally, it also includes an air source, which 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 temperature measuring instrument is further included, which is arranged in the heating box, and the first temperature measuring instrument is used to obtain the temperature of the titanium side surface of the titanium-steel composite plate.

[0015] Optionally, a second temperature measuring instrument is further included, which is arranged in the heating box, and the second temperature measuring instrument is used to obtain the temperature of the steel side surface 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 a first condenser, a second condenser, a pressure compensator and a capillary tube in sequence through pipelines, the capillary tube is connected to the inlet of the flow trough through a pipeline, and the outlet of the flow trough 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 pressing 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] The magnetic field generator is used to change the current distribution inside the titanium-steel composite plate so that the current is gathered toward the bonding interface between the steel side and the titanium side away from the titanium-steel composite plate;

[0025] The coolant is made 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 invention discloses the following technical effects: after a titanium-steel composite plate is clamped by a pair of clamps, the steel side surface clamped by the titanium-steel composite plate is made to abut against a pressure plate, and the titanium side surface is made to abut against a 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 by 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 gathers toward the steel side and the titanium side bonding interface away from the titanium-steel composite plate, and finally makes the steel side temperature and the titanium side temperature of the titanium-steel composite plate at a higher 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, 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 bonding of the titanium-steel composite plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

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

[0029] Figure 2 It 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 It is a schematic diagram of the cooling plate structure of the present invention;

[0032] Figure 5 It is a 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. fixture; 5. positive electrode interface; 6. negative electrode interface; 7. pulse power supply; 8. pressure 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work 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 a titanium / austenitic stainless steel composite plate, comprising:

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

[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, 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;

[0040] A pulse power supply 7 is arranged 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;

[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 disposed on the second support frame 3 and is connected to the pulse power supply 7;

[0043] The 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. Coolant flows in the cooling plate 10. 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 abutted against the pressure plate 8, and the titanium side is abutted 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 to make the current gather toward the steel side and 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. 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 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 temperature measuring instrument 13 disposed in the heating box 2, and the first temperature measuring instrument 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 temperature measuring instrument 14 disposed 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.

[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 compensation pressure of the pressure compensator 24 through temperature monitoring feedback, so as to adjust 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] A further optimized solution is 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, the sliding frame 16 is provided with a first motor 17 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 realizing the pressing action of the pressing plate 8 , so that the titanium steel composite plate and the cooling plate 10 are tightly combined.

[0055] According to a further optimized 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 being pressed down.

[0057] According to a further optimized solution, 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 clamps 4 for driving the clamps 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 optimized solution, the cooling plate 10 includes a plate body 102 having a flow groove 101, a sealing ring 103 disposed on the plate body 102, and a plate cover 104 connected to the plate body 102, and the flow groove 101 in the plate body 102 is connected to the coolant circulation condensation system.

[0061] A further optimized solution is that 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 in sequence through pipelines, 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, dissipates heat through the first condenser 22 and the second condenser 23, throttling and reducing pressure and temperature through the capillary 25, and compensating the pressure through 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 is against the pressing plate 8, and the titanium side is 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 gathers to 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 of the steel side and the titanium side is increased to reach the preset temperature of the steel side.

[0067] The condensing agent 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", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0070] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A gradient heating device for titanium / austenitic stainless steel composite plate, 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 arranged 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 supporting 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 comprises an air source (11), wherein the air source (11) is connected to a vent (12) via 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 plate according to claim 1, characterized in that: It also comprises a first temperature measuring instrument (13) which is arranged in the heating box (2), and the first temperature measuring instrument (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 plate according to claim 1, characterized in that: It also comprises 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) via a connecting frame.

6. The gradient heating device for titanium / austenitic stainless steel composite plate 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 plate 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 plate 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 cooling liquid circulation condensation system.

9. The gradient heating device for titanium / austenitic stainless steel composite plate according to claim 8, characterized in that: The coolant circulation condensation system comprises 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 (25) in sequence through pipelines, the capillary (25) is connected to an inlet of the flow tank (101) through a pipeline, and the outlet of the flow tank (101) is connected to an inlet of the compressor (21) through a pipeline.

10. A gradient heating method for a titanium / austenitic stainless steel composite plate, based on a 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 the clamps (4), and at the same time, the steel side surface of the titanium-steel composite plate abuts against the pressing plate (8), and the titanium side surface abuts against the cooling plate (10); 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; The magnetic field generator (9) is used to change the current distribution inside the titanium-steel composite plate so that the current is gathered toward the bonding interface between the steel side and the titanium side away from the titanium-steel composite plate; The cooling liquid circulation condensation system allows the condensing agent to flow in the cooling plate (10), so that the cooling plate (10) cools the titanium side of the titanium-steel composite plate.

Images