Forming process and hot rolling device of high-thermal-conductivity titanium-aluminum composite plate

Abstract

The application discloses a forming process and a hot rolling device of a high-thermal-conductivity titanium-aluminum composite plate, and relates to the technical field of titanium-aluminum composite materials.The forming process comprises the following steps: S1, performing laser texturing on the surface of a TC4 alloy titanium plate to remove the oxide layer on the surface of the TC4 alloy titanium plate, and roughening the surface of the TC4 alloy titanium plate to Ra2.0-3.0 microns by laser texturing; S2, preparing a composite plate by hot-rolling compounding of the TC4 alloy titanium plate and a high-strength aluminum plate, and making the titanium surface of the composite plate face the ground; S3, after the hot-rolled composite plate, making the composite plate pass through guide rollers in an upwardly inclined manner and then discharge in an inclined downward manner; S4, cutting the discharged composite plate into a plurality of plates with the same size according to a set size, and making the plates be arched; and S5, cooling the plates, and the beneficial effects are that the oxide on the surface of the TC4 alloy titanium plate is removed and new titanium alloy is exposed by laser texturing, the metal combination and mechanical engagement of the titanium-aluminum interface are significantly enhanced, and the thermal conductivity and the combination strength of the composite plate are fundamentally improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of titanium-aluminum composite materials, in particular to a forming process and a hot rolling device for high-thermal-conductivity titanium-aluminum composite plates. BACKGROUND

[0002] Titanium-aluminum composite materials have the characteristics of high strength, light weight, wear resistance, corrosion resistance and excellent thermal conductivity, and have significant advantages and good application prospects in the heat dissipation of artificial intelligence and high-throughput operation cabinets. Since the thermal expansion coefficient of titanium is much smaller than that of aluminum, the expansion and cold shrinkage of titanium-aluminum after thermal compounding differ greatly, which causes serious warping of the titanium-aluminum composite plate. In addition, the peeling strength of titanium-aluminum after compounding is insufficient, which is prone to delamination, thereby restricting the application and promotion of the titanium-aluminum composite plate.

[0003] Therefore, it is necessary to develop a forming process and a hot rolling device for high-thermal-conductivity titanium-aluminum composite plates. SUMMARY

[0004] The application relates to a forming process and a hot rolling device for high-thermal-conductivity titanium-aluminum composite plates.

[0005] The first application purpose of the application is to provide a forming process for high-thermal-conductivity titanium-aluminum composite plates.

[0006] The second application purpose of the application is to provide a hot rolling device for high-thermal-conductivity titanium-aluminum composite plates.

[0007] To achieve the above-mentioned first application purpose, the application provides a forming process for high-thermal-conductivity titanium-aluminum composite plates, which comprises the following steps:

[0008] S1: The surface of a TC4 alloy titanium plate is laser textured to remove the oxide layer on the surface, and the roughness of the surface of the TC4 alloy titanium plate is laser textured to Ra2.0-3.0 microns;

[0009] S2: A TC4 alloy titanium plate and a high-strength aluminum plate are prepared into a composite plate through a hot rolling compounding process with the laser textured surface of the TC4 alloy titanium plate as the compounding surface, and the titanium surface of the composite plate faces the ground;

[0010] S3: The composite plate after hot rolling is passed through a guide roller in an upwardly inclined manner and then discharged in an inclined downward manner;

[0011] S4: The composite plate after discharge is cut into several plates of the same size according to the set size, and the plates are arched;

[0012] S5: The plates are cooled, and the plates are flattened by taking advantage of the characteristic that the cold shrinkage amount of the high-strength aluminum plate is greater than that of the TC4 alloy titanium plate, to form flat composite plates.

[0013] Preferably, the surface hardness of the TC4 alloy titanium plate is greater than HV350.

[0014] Preferably, in step S1, the speed of laser texturing is 2m / min-3m / min.

[0015] Preferably, in step S1, the surface of the TC4 alloy titanium plate is washed in a slanting manner by a laser beam, and the included angle between the laser beam and the vertical plane is 20°-45°.

[0016] Preferably, the thickness of the TC4 alloy titanium plate is 0.5mm-3.0mm, and the thickness of the high-strength aluminum plate is 1.0mm-6.0mm.

[0017] Preferably, in step S3, the angle of upward inclination and the angle of downward inclination of the composite plate are both 5°-10°.

[0018] Preferably, in step S1, the surface of the TC4 alloy titanium plate after laser texturing is blown by a high-pressure gas flow.

[0019] Preferably, the diameter of the guide roller is 800m-1000m.

[0020] Based on the same inventive principle, in order to achieve the above-mentioned second object, the application provides a high-thermal-conductivity titanium-aluminum composite plate hot-rolling device, which comprises at least one pair of hot-rolling rollers and a guide roller.

[0021] The laser-textured surface of the TC4 alloy titanium plate is used as a composite surface, and the TC4 alloy titanium plate and the high-strength aluminum plate are hot-rolled and combined by at least one pair of the hot-rolling rollers to form a composite plate, and the titanium surface of the composite plate faces the ground.

[0022] After hot-rolling, the composite plate passes through the guide roller in an upwardly inclined manner and is discharged in a downwardly inclined manner, and the angle of upward inclination and the angle of downward inclination of the composite plate are both 5°-10°.

[0023] After being discharged, the composite plate is cut into several plates of the same size according to the set size, and the plates are arched.

[0024] Preferably, the surface hardness of the TC4 alloy titanium plate is greater than HV350, the thickness of the TC4 alloy titanium plate is 0.5mm-3.0mm, and the thickness of the high-strength aluminum plate is 1.0mm-6.0mm.

[0025] The diameter of the hot-rolling roller is 600mm-800mm, and the diameter of the guide roller is 800m-1000m.

[0026] Compared with the prior art, the application has the following beneficial effects:

[0027] (1) By laser texturing, the oxide on the surface of the TC4 alloy titanium plate is removed and new titanium alloy is exposed, the surface roughness reaches 2.0-3.0 microns, which significantly enhances the metal bonding and mechanical engagement of the titanium-aluminum interface, and fundamentally improves the thermal conductivity and bonding strength of the composite plate.

[0028] (2) Creatively, the composite plate is first made to have an arch shape, and then the composite plate is flattened by taking advantage of the difference in thermal expansion coefficient between titanium and aluminum. The problem of severe deformation of titanium-aluminum dissimilar metal composite plate caused by the difference in physical properties during hot rolling and cooling is solved efficiently and at low cost, and finally a composite plate with high flatness is obtained.

[0029] (3) By using the technology of changing the bonding strength of titanium and aluminum by laser texturing and the deformation control technology of the composite plate, the bonding strength of the titanium-aluminum composite plate is greatly improved, and at the same time, the composite plate with high flatness is prepared by the deformation control technology of the composite plate. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a cross-sectional view of the high-thermal-conductivity titanium-aluminum composite plate of the present application.

[0031] Figure 2 is a schematic diagram of the cooling and flattening process of the high-thermal-conductivity titanium-aluminum composite plate of the present application.

[0032] Figure 3 is a flow chart of the forming process of the high-thermal-conductivity titanium-aluminum composite plate of the present application.

[0033] Figure 4 is a schematic diagram of the hot rolling device of the high-thermal-conductivity titanium-aluminum composite plate of the present application.

[0034] Figure 5 is a schematic diagram of the laser beam irradiating the surface of the TC4 alloy titanium plate.

[0035] Wherein, 1, TC4 alloy titanium plate; 11, titanium surface; 2, laser beam; 3, micro-pit; 4, high-strength aluminum plate; 5, guide roller; 6, hot rolling roller; 7, plate. DETAILED DESCRIPTION

[0036] The present application will be described in detail below in conjunction with the embodiments shown in the drawings, but it should be noted that these embodiments are not a limitation on the present application, and equivalent transformations or substitutions of function, method, or structure made by those skilled in the art based on these embodiments are within the scope of protection of the present application.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Embodiment one

[0038] Referring to Figures 1 to 5 The embodiment discloses a specific implementation of a forming process of a high-thermal-conductivity titanium-aluminum composite plate.

[0039] A forming process of a high-thermal-conductivity titanium-aluminum composite plate, referring to Figures 1 to 5 As shown, the steps include:

[0040] S1: The surface of the TC4 alloy titanium plate 1 is laser textured to remove the oxide layer on the surface, and the roughness of the surface of the TC4 alloy titanium plate 1 is laser textured to Ra2.0 μm-Ra3.0 μm; Specifically, the surface hardness of the TC4 alloy titanium plate 1 is greater than HV350, and the removal of the oxide layer is difficult, and ordinary sanding cannot achieve the purpose of removing the oxide layer and exposing the new titanium alloy. The purpose of step S1 is to remove the oxide on the surface of the TC4 alloy titanium plate 1 and expose the new titanium alloy, and the surface roughness (Ra) reaches 2.0 μm-3.0 μm, preferably 2.5 μm or 2.8 μm, which significantly enhances the metal bonding and mechanical engagement of the titanium-aluminum interface, and fundamentally improves the thermal conductivity and bonding strength of the composite plate; the thickness of the TC4 alloy titanium plate is 0.5mm-3.0mm, preferably 1.0mm, 1.2mm, 1.5mm, 1.8mm, 2.2mm, 2.5mm; the speed of laser texturing is 2m / min-3m / min; in step S1, the laser beam 2 cleans the surface of the TC4 alloy titanium plate 1 in an inclined manner, and the included angle between the laser beam and the vertical plane is 20°-45°. The laser beam 2 is inclined so that the micro-pits 3 formed on the surface of the TC4 alloy titanium plate 1 have an inclined structure, which is described in detail with reference to Figure 5 During the laser texturing process, the surface of the TC4 alloy titanium plate 1 after laser texturing is blown by high-pressure airflow to timely remove the removed oxides and other impurities.

[0041] S2: Take the laser roughened surface of the TC4 alloy titanium plate 1 as a composite surface, and prepare a composite plate by hot rolling of the TC4 alloy titanium plate 1 and the high-strength aluminum plate 4, wherein the titanium surface 11 of the composite plate faces the ground; specifically, the thickness of the high-strength aluminum plate 4 is 1.0mm-6.0mm, preferably 2.0mm, 2.6mm, 3.0mm, 4.6mm, 4.9mm, 5.8mm; in this embodiment, the high-strength aluminum plate 4 accounts for 50%-70% of the total thickness, preferably 66.7%, that is, the titanium-aluminum composite plate is mainly composed of the high-strength aluminum plate 4, and the titanium-aluminum composite plate has an advantage in terms of cost performance due to the lighter density and lower cost of the high-strength aluminum plate 4. During the hot rolling process of the high-strength aluminum plate 4 and the TC4 alloy titanium plate 1, part of the aluminum is extruded into the micro-pits 3 of the inclined structure, so that the metal bonding and mechanical engagement of the titanium-aluminum interface are achieved, the composite strength is large, and the peeling strength is above 200N / mm.

[0042] S3: The composite plate after hot rolling passes through the guide roller in an upwardly inclined manner and then is discharged in an inclined downward manner; in step S3, the upward inclination angle and the downward inclination angle of the composite plate are both 5°-10°, and the diameter of the guide roller 5 is 800m-1000m, as shown in Figure 3 , the purpose of step S3 is to make the composite plate have a certain arched curvature, so that the composite plate is bent and deformed towards the titanium surface 11, and the diameter of the guide roller 5 is larger than that of the hot rolling roller 6, so that the bending deformation degree of the composite plate is within a predetermined range.

[0043] S4: The discharged composite plate is cut into several plates 7 of the same size according to the set size, and the plates 7 are arched; specifically, as shown in Figure 2 , the arched direction of the plate 7 is towards the titanium surface 11.

[0044] S5: Cooling the plate, and using the feature that the cold shrinkage of the high-strength aluminum plate is greater than that of the TC4 alloy titanium plate to flatten the plate, thereby forming a flat composite plate. Specifically, water cooling is preferred for rapid cooling, and during the cooling process, due to the large difference in the thermal expansion coefficients of titanium and aluminum, the cold shrinkage of the high-strength aluminum plate is greater than that of the TC4 alloy titanium plate, and the difference in the cold shrinkage is used to flatten the arch of the plate 6, thereby forming a high-flatness plate.

[0045] Through this embodiment, the composite plate is creatively made to have an arch, and then is flattened by taking advantage of the difference in the thermal expansion coefficients of titanium and aluminum during cooling, thereby efficiently and at low cost solving the problem of serious deformation of the titanium-aluminum dissimilar metal composite plate caused by the difference in physical properties during hot rolling and cooling, and finally obtaining a high-flatness composite plate. Embodiment Two

[0046] As shown in Figure 3 , this embodiment discloses a specific implementation of a high-thermal-conductivity titanium-aluminum composite plate hot rolling device.

[0047] A hot rolling apparatus for high thermal conductivity titanium-aluminum composite plates, reference Figure 3 As shown, it includes at least one pair of hot rolling rolls 6 and guide rolls 5. The diameter of the hot rolling rolls is 600mm-800mm, and the diameter of the guide rolls is 800mm-1000mm. Using the laser-textured surface of the TC4 alloy titanium plate 1 as the composite surface, the TC4 alloy titanium plate 1 and the high-strength aluminum plate 4 are hot-rolled together by at least one pair of the hot rolling rolls to form a composite plate. The titanium surface 11 of the composite plate faces the ground. The hot-rolled composite plate passes through the guide rolls 5 at an upward inclination and then exits at an downward inclination. The upward and downward inclination angles of the composite plate are both 5°-10°. The exited composite plate is cut into several plates 6 of the same size according to a set size. The plates are arched.

[0048] Specifically, the surface hardness of TC4 alloy titanium plate 1 is greater than HV350, making oxide layer removal difficult. Ordinary sandblasting cannot achieve the goal of removing the oxide layer and exposing the new titanium alloy. The purpose of step S1 is to remove the oxide layer on the surface of TC4 alloy titanium plate 1 and expose the new titanium alloy, achieving a surface roughness (Ra) of 2.0μm-3.0μm, preferably 2.5μm or 2.8μm. This significantly enhances the metallic bonding and mechanical interlocking of the titanium-aluminum interface, fundamentally improving the thermal conductivity and bonding performance of the composite plate. Strength; the thickness of the TC4 alloy titanium plate is 0.5mm-3.0mm, preferably 1.0mm, 1.2mm, 1.5mm, 1.8mm, 2.2mm, or 2.5mm; the laser texturing speed is 2m / min-3m / min; in step S1, the laser beam 2 cleans the surface of the TC4 alloy titanium plate 1 in an inclined manner, the angle between the laser beam and the vertical plane is 20°-45°, and the inclination of the laser beam 2 causes the micro-pits 3 formed on the surface of the TC4 alloy titanium plate 1 to have an inclined structure, see details. Figure 5 During the laser texturing process, a high-pressure airflow is used to blow away the surface of the laser-textured TC4 alloy titanium plate 1, promptly removing oxides and other impurities. During the hot rolling process between the high-strength aluminum plate 4 and the TC4 alloy titanium plate 1, some aluminum is squeezed into the inclined micro-pits 3, resulting in metal bonding and mechanical interlocking at the titanium-aluminum interface, leading to high composite strength and a peel strength exceeding 200 N / mm. The guide roller 5 is used to present the composite plate with a certain arched curvature, causing the composite plate to bend and deform towards the titanium surface 11, ensuring that the bending deformation of the composite plate is within a predetermined range. The arched direction of the cut plate 7 faces the titanium surface 11. After rapid water treatment, the arched plate 7 is leveled using the significant difference in thermal expansion coefficients between titanium and aluminum, thereby forming a highly flat plate.

[0049] The high thermal conductivity titanium-aluminum composite plate hot rolling device of Example Two is used to realize steps S2 to S4 of Example One. This example has the same technical solutions as the same parts of Example One, and please refer to the description of Example One, which will not be repeated here.

Claims

1. A molding process for a high thermal conductivity titanium-aluminum composite plate, characterized in that, Includes the following steps: S1: The surface of the TC4 alloy titanium plate is laser-textured to remove the oxide layer on its surface, and the surface roughness of the TC4 alloy titanium plate is laser-textured to Ra2.0μm-Ra3.0μm; S2: Using the laser-textured surface of TC4 alloy titanium plate as the composite surface, a composite plate is prepared by hot rolling composite process of TC4 alloy titanium plate and high-strength aluminum plate, with the titanium surface of the composite plate facing the ground. S3: The hot-rolled composite plate passes through the guide rollers at an upward inclination and then exits at an downward inclination. S4: After the composite board is discharged, it is cut into several boards of the same size according to the set dimensions, and the boards are arched; S5: Cool the plate material, and use the fact that the high-strength aluminum plate has a greater shrinkage than the TC4 alloy titanium plate to level the plate material, forming a flat composite plate material.

2. The molding process of a high thermal conductivity titanium-aluminum composite plate as described in claim 1, characterized in that, The surface hardness of the TC4 alloy titanium plate is greater than HV350.

3. The molding process of a high thermal conductivity titanium-aluminum composite plate as described in claim 1, characterized in that, In step S1, the laser texturing speed is 2m / min-3m / min.

4. The molding process of a high thermal conductivity titanium-aluminum composite plate as described in any one of claims 1-3, characterized in that, In step S1, the laser beam cleans the surface of the TC4 alloy titanium plate at an angle of 20°-45° with respect to the vertical plane.

5. The molding process of a high thermal conductivity titanium-aluminum composite plate as described in claim 4, characterized in that, The thickness of the TC4 alloy titanium plate is 0.5mm-3.0mm, and the thickness of the high-strength aluminum plate is 1.0mm-6.0mm.

6. The molding process of a high thermal conductivity titanium-aluminum composite plate as described in claim 4, characterized in that, In step S3, the composite plate is tilted upwards and downwards at angles of 5°-10°.

7. The molding process of a high thermal conductivity titanium-aluminum composite plate as described in claim 4, characterized in that, In step S1, the surface of the laser-textured TC4 alloy titanium plate is swept by a high-pressure airflow.

8. The molding process of a high thermal conductivity titanium-aluminum composite plate as described in claim 4, characterized in that, The diameter of the guide roller is 800m-1000m.

9. A hot rolling apparatus for high thermal conductivity titanium-aluminum composite plates, characterized in that, Includes at least one pair of hot rolling rolls and guide rolls; Using the laser-textured surface of a TC4 alloy titanium plate as the composite surface, the TC4 alloy titanium plate and a high-strength aluminum plate are hot-rolled together through at least one pair of hot rolling rolls to form a composite plate, with the titanium surface of the composite plate facing the ground. After hot rolling, the composite plate passes through the guide roller at an upward inclination and then exits at an downward inclination. The upward and downward inclination angles of the composite plate are both 5°-10°. After being discharged, the composite board is cut into several boards of the same size according to the set dimensions, and the boards are arched.

10. The hot rolling apparatus for high thermal conductivity titanium-aluminum composite plates as described in claim 9, characterized in that, The surface hardness of the TC4 alloy titanium plate is greater than HV350, the thickness of the TC4 alloy titanium plate is 0.5mm-3.0mm, and the thickness of the high-strength aluminum plate is 1.0mm-6.0mm. The diameter of the hot rolling roll is 600mm-800mm, and the diameter of the guide roll is 800mm-1000mm.

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