Magnesium-titanium composite material continuous casting and rolling device and preparation method thereof

Abstract

The invention discloses a magnesium-titanium composite material continuous casting and rolling device which comprises a stranding machine, a preform smelting furnace, a hot rolling mill and a winding machine, the middle of the preform smelting furnace is sleeved with a first induction heating coil, in addition, the invention further provides a preparation method of a magnesium-titanium composite material, magnesium wires and titanium wires are stranded into bundles, and a magnesium-titanium preform is obtained; and then smelting in a preform smelting furnace, pulling and cooling, and carrying out hot rolling and rolling to obtain the magnesium-titanium composite board. The preparation method comprises the following steps: stranding magnesium wires and titanium wires into bundles by arranging a stranding machine, smelting a magnesium-titanium preform by arranging a preform smelting furnace, carrying out continuous hot rolling for multiple times by arranging a hot rolling mill, finally rolling by adopting a rolling machine, and carrying out segmented melting, continuous cooling and continuous rolling to prepare the magnesium alloy plate. The preparation speed is controllable, the process is continuous, the production efficiency is greatly improved, and continuous and efficient preparation of the magnesium-titanium composite material is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of magnesium-titanium composite materials, and specifically relates to a magnesium-titanium composite material continuous casting and rolling device and a preparation method thereof. Background Art

[0002] Magnesium and magnesium alloys are metal materials with a close-packed hexagonal crystal structure and a density of about 1.8 g / cm 3 , is the lightest metal structural material, and has broad application prospects in the field of lightweighting. Although magnesium alloys have high specific strength and specific stiffness, their absolute strength is low and their room temperature plasticity is poor, making it difficult for them to meet the mechanical properties required by components, and their scope of application is limited. With the advancement of science and technology, the production and life of human society have higher and higher requirements for material properties, and a single material can no longer meet the requirements; and two or more materials with different properties can be prepared by physical or chemical methods to obtain composite materials, which can give full play to the performance advantages of each heterogeneous material, so that the composite material exhibits excellent comprehensive performance, thereby meeting various different needs.

[0003] The density of titanium and titanium alloys is about 4.5g / cm 3 , its density is relatively low, only 60% of that of steel. Titanium alloy has high strength, good plasticity, good heat resistance and corrosion resistance, and is often used in aerospace, transportation, electronics 3C and other fields. It is also a high-quality lightweight material.

[0004] Therefore, magnesium-titanium composite will not only not affect the lightweight effect of the final material, but also improve the comprehensive mechanical properties of the material. At present, the methods of magnesium-titanium composite mainly include powder metallurgy, casting, melt infiltration, hot rolling, welding, etc. Different processes have different characteristics. For example, when magnesium-titanium composite is achieved through casting, it is necessary to use stirring and other methods to make the titanium reinforcement phase evenly distributed. Melt infiltration requires 3D printing of titanium alloy preforms in advance. Hot rolling needs to consider the interface bonding quality. The powder metallurgy preparation efficiency is low.

[0005] Therefore, there is an urgent need for a new method for preparing magnesium-titanium composite materials, which can not only realize the effective combination of the two metals of magnesium and titanium, but also realize larger-size and large-scale mass production, thereby meeting the diversification and lightweight needs of future products and broadening the application prospects of the material. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a magnesium-titanium composite material continuous casting and rolling device in view of the deficiencies of the above-mentioned prior art. The device is provided with a stranding machine to twist magnesium wires and titanium wires into bundles, and is provided with a preform melting furnace to facilitate the melting of the magnesium-titanium preforms left in the preform melting furnace. A hot rolling mill is provided and the hot rolling mill is connected in series with the rear end of the preform melting furnace to perform multiple continuous hot rolling on the magnesium-titanium composite rods, and finally a coiler is used for coiling. The overall device has a simple structure and is easy to operate, and can produce and prepare magnesium-titanium composite plates of different sizes according to actual needs.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a magnesium-titanium composite material continuous casting and rolling device, characterized in that the device includes a stranding machine, a preform melting furnace is arranged at the outlet of the stranding machine, a first induction heating coil is sleeved in the middle of the preform melting furnace, a hot rolling mill is arranged at one end of the preform melting furnace away from the stranding machine, and a winder is arranged next to the hot rolling mill.

[0008] The above-mentioned continuous casting and rolling device for magnesium-titanium composite materials is characterized in that a condensing jacket is provided on the side of the preform melting furnace away from the stranding machine.

[0009] The above-mentioned magnesium-titanium composite material continuous casting and rolling device is characterized in that a vent and a feeding melting chamber are sequentially arranged on the preform melting furnace close to the stranding machine, and a second induction heating coil is arranged on the feeding melting chamber.

[0010] In addition, the present invention also provides a method for continuous casting and rolling of a magnesium-titanium composite material, characterized in that the method comprises the following steps:

[0011] Step 1: transporting magnesium wire and titanium wire to a stranding machine to strand them into bundles to obtain a magnesium-titanium preform; the material of the magnesium wire is magnesium alloy, and the material of the titanium wire is titanium or titanium alloy;

[0012] Step 2: inserting the magnesium-titanium preform obtained in step 1 into the preform melting furnace, and making the front end of the magnesium-titanium preform extend out of the preform melting furnace, so as to obtain a charging preform melting furnace;

[0013] Step 3: placing a magnesium feed rod having the same composition as the magnesium wire in step 1 into the feed melting chamber of the preform charging melting furnace obtained in step 2, then connecting argon gas to the vent, and introducing argon gas into the preform charging melting furnace, and then introducing coolant into the condensation jacket to obtain a preform melting furnace to be melted;

[0014] Step 4, opening the first induction heating coil and the second induction heating coil in the melting furnace of the preform to be melted obtained in step 3, so that the magnesium wire and the magnesium filler rod in the magnesium-titanium preform are melted, and the titanium wire is not melted, to form molten magnesium and titanium, and then the part of the magnesium-titanium preform that extends out of the preform melting furnace is pulled, and the molten magnesium and titanium are driven to cool into magnesium-titanium composite rods, and then the magnesium-titanium composite rods are continuously hot-rolled for multiple times by a hot rolling mill, and finally a winder is used to wind them to obtain a magnesium-titanium composite plate.

[0015] The present invention first transports magnesium wires and titanium wires to a stranding machine for stranding into bundles, so that the magnesium wires and titanium wires form a three-dimensional interlocking, closely arranged, and mutually restrained magnesium-titanium preform, and then melts the magnesium wires and magnesium filler rods with a low melting point through smelting, while the titanium wires do not melt and maintain the original spatial structure, wherein the magnesium filler rods are used to fill the gaps formed by the stranding of the magnesium-titanium wires, so that the molten magnesium completely wraps the titanium wires according to the stranded spatial structure, and by pulling the part of the magnesium-titanium preform that extends out of the preform melting furnace at the front end, the molten magnesium and titanium are driven to move to the condensation sleeve, and further cooled so that the molten magnesium and titanium are cooled into magnesium-titanium composite rods, and finally, through multiple continuous hot rolling and winding, a magnesium-titanium composite plate is obtained.

[0016] In step 1 of the present invention, the twisting process is designed according to the needs to obtain magnesium-titanium preforms with different magnesium-titanium spatial distributions and different diameters.

[0017] The above method is characterized in that the preform melting furnace in step 2 is tilted downward by 5° to 60° near the hot rolling mill. The present invention facilitates the flow of molten magnesium-titanium preforms to the condensing jacket by tilting the preform melting furnace, thereby facilitating cooling.

[0018] The above method is characterized in that step 4 is performed 5 to 10 minutes after the argon is introduced in step 3. The present invention removes other gases in the preform melting furnace by introducing argon for a period of time, thereby preventing the influence of impurity gases and preventing oxidation.

[0019] The above method is characterized in that in step 4, the lengths of the first induction heating coil and the second induction heating coil are both 50 mm to 100 mm, and the heating temperatures of the first induction heating coil and the second induction heating coil are both 660° C. to 700° C. The present invention controls the amount of magnesium wire and magnesium filler bar melted by controlling the length of the heating coil, and controls the heating temperature to ensure that the magnesium wire and magnesium filler bar melt and the titanium wire does not melt.

[0020] The above method is characterized in that the cooling in step 4 is to cool the molten magnesium-titanium preform to 200° C. to 400° C. The present invention ensures that the molten magnesium solidifies by controlling the cooling temperature, while retaining a certain temperature to facilitate subsequent hot rolling and reduce the heating of hot rolling.

[0021] The above method is characterized in that the pulling speed in step 4 is 40 mm / min to 60 mm / min. The present invention ensures that the magnesium wire and the magnesium filler rod are fully melted and the molten magnesium is fully solidified by controlling the pulling speed.

[0022] It should be noted that when the magnesium-titanium preform is pulled, the stranding machine delivers magnesium wires and titanium wires to the preform melting furnace at the same speed to obtain the magnesium-titanium preform by stranding them into bundles.

[0023] The above method is characterized in that the temperature of the multiple continuous hot rolling in step 4 is 250° C. to 400° C. The present invention controls the rolling temperature to be higher than the dynamic recrystallization temperature of magnesium, which facilitates the rolling and improves the performance of the magnesium-titanium composite plate.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. The present invention arranges a stranding machine to twist magnesium wires and titanium wires into bundles to form a magnesium-titanium preform, and arranges a preform melting furnace to penetrate and pass the magnesium-titanium preform through, so that the magnesium-titanium preform remaining in the preform melting furnace is melted. At the same time, when the magnesium-titanium preform passing through the preform melting furnace is pulled, the molten magnesium-titanium preform is pulled out and cooled to form a magnesium-titanium composite rod. A hot rolling mill is arranged and the hot rolling mill is connected in series to the rear end of the preform melting furnace to perform multiple continuous hot rolling on the magnesium-titanium composite rod, and finally a coiler is used for coiling. The overall device has a simple structure and is easy to operate, and can produce and prepare magnesium-titanium composite plates of different sizes according to actual needs.

[0026] 2. The present invention prepares magnesium alloy plates by means of segmented melting, continuous cooling and continuous rolling. The preparation speed is controllable and the process is continuous, which greatly improves the production efficiency and realizes the continuous and efficient preparation of magnesium-titanium composite materials.

[0027] 3. The present invention can make full use of the residual heat after smelting, and hot rolling can be carried out without secondary heating or partial secondary heating, which effectively saves energy.

[0028] 4. The magnesium-titanium composite plate prepared by the present invention has a tight magnesium-titanium bond and a uniform distribution of the titanium alloy. During the rolling process, both the magnesium alloy and the titanium alloy are deformed, and the microstructure is optimized and regulated as a whole.

[0029] 5. The present invention fully realizes the effective compounding of magnesium and titanium, and the obtained composite plate has outstanding performance.

[0030] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of a continuous casting and rolling device for magnesium-titanium composite materials in the present invention;

[0032] Figure 2 It is a structural schematic diagram of the preform melting furnace in the present invention.

[0033] Figure 3 This is a metallographic image of the longitudinal section of the magnesium-titanium composite plate obtained in Example 2 of the present invention.

[0034] Figure 4 This is the tensile stress-strain curve of the magnesium-titanium composite plate obtained in Example 2 of the present invention.

[0035] Description of reference numerals:

[0036] 1—stranding machine; 2—preform melting furnace; 3—first induction heating coil;

[0037] 4—hot rolling mill; 5—coiler; 6—condenser sleeve;

[0038] 7—vent; 8—filling melting chamber; 9—second induction heating coil;

[0039] 10—magnesium-titanium preform; 11—magnesium filler rod. DETAILED DESCRIPTION

[0040] A magnesium-titanium composite material continuous casting and rolling device of the present invention is described in detail through Example 1.

[0041] Example 1

[0042] like Figure 1 and Figure 2As shown, the magnesium-titanium composite material continuous casting and rolling device of this embodiment includes a stranding machine 1, a preform melting furnace 2 is arranged at the outlet of the stranding machine 1, a first induction heating coil 3 is sleeved in the middle of the preform melting furnace 2, a hot rolling mill 4 is arranged at one end of the preform melting furnace 2 away from the stranding machine 1, and a winder 5 is arranged next to the hot rolling mill 4. A stranding machine 1 is provided to twist magnesium wires and titanium wires into bundles to form a magnesium-titanium preform 10. A preform melting furnace 2 is provided to penetrate and pass the magnesium-titanium preform 10, so that the magnesium-titanium preform 10 remaining in the preform melting furnace 2 can be melted. At the same time, when the magnesium-titanium preform 10 passing through the preform melting furnace 2 is pulled, the melted magnesium-titanium preform 10 is pulled out and cooled to form a magnesium-titanium composite rod. A hot rolling mill 4 is provided and the hot rolling mill 4 is connected in series to the rear end of the preform melting furnace 2, so that the magnesium-titanium composite rod is continuously hot-rolled for multiple times, and finally a coiler 5 is used to coil it to obtain a magnesium-titanium composite plate.

[0043] like Figure 1 and Figure 2 As shown, the preform melting furnace 2 of this embodiment is provided with a condensation jacket 6 on the side away from the stranding machine 1. The condensation jacket 6 is provided to accelerate the cooling of the molten magnesium, thereby ensuring that the molten magnesium and titanium are cooled and formed.

[0044] like Figure 1 and Figure 2 As shown, a vent 7 and a feeding melting chamber 8 are sequentially provided on the preform melting furnace 2 near the stranding machine 1, and a second induction heating coil 9 is provided on the feeding melting chamber 8. The vent 7 is provided to facilitate the introduction of protective gas into the preform melting furnace 2 to prevent oxidation during the melting process, and the feeding melting chamber 8 and the second induction heating coil 9 are provided to facilitate the melting of the magnesium feeding rod 11 in the feeding melting chamber 8, so as to replenish magnesium into the preform melting furnace 2.

[0045] The preparation method of the magnesium-titanium composite plate of the present invention is described in detail through Examples 2 to 4.

[0046] Example 2

[0047] This embodiment includes the following steps:

[0048] Step 1: Use a stranding machine to strand 6 AZ31 magnesium alloy wires with a diameter of 1 mm along a 45° direction on the outside of a TA1 titanium wire with a diameter of 1 mm to obtain a titanium core magnesium stranded wire, and then repeat the above stranding process three times to obtain a magnesium-titanium preform with a diameter of 27 mm;

[0049] Step 2: inserting the magnesium-titanium preform obtained in step 1 into a preform melting furnace, wherein the preform melting furnace is inclined at 5°, and the front end of the magnesium-titanium preform is extended out of the preform melting furnace, to obtain a charging preform melting furnace;

[0050] Step 3: Place the magnesium feed rod with the same composition as the magnesium alloy wire in step 1 into the feed melting chamber of the preform charging melting furnace obtained in step 2, then connect argon gas to the vent, and introduce argon gas into the preform charging melting furnace for 10 minutes, and then introduce coolant into the condensation jacket to obtain a preform melting furnace to be melted;

[0051] Step 4, open the first induction heating coil and the second induction heating coil, both of which are 60 mm in length, in the melting furnace of the preform to be melted obtained in step 3, and control the induction heating temperature to 680°C, so that the magnesium alloy wire and the magnesium filler rod in the magnesium-titanium preform are melted, and the titanium wire is not melted, to form molten magnesium and titanium, and then the part of the front end of the magnesium-titanium preform extending out of the preform melting furnace is pulled at a speed of 40 mm / min, and the molten magnesium and titanium are driven to cool into a magnesium-titanium composite rod with a temperature of 300°C, and then the magnesium-titanium composite rod is continuously hot-rolled for multiple times at 300°C by a hot rolling mill to control the thickness to 1 mm, and a coiler is used to coil it to obtain a magnesium-titanium composite plate.

[0052] Figure 3 is the metallographic image of the longitudinal section of the magnesium-titanium composite plate obtained in this embodiment. Figure 3 It can be seen that the titanium alloy wire in the magnesium-titanium composite plate obtained in this embodiment undergoes obvious plastic deformation, changing from a round shape to an irregular shape and forming a serrated meshing with the magnesium matrix. In addition, the grains of the magnesium alloy matrix are significantly refined.

[0053] Figure 4 is the tensile stress-strain curve of the magnesium-titanium composite plate obtained in this embodiment. Figure 4 It can be seen that the magnesium-titanium composite plate obtained in this embodiment has a fracture elongation of 9% and a tensile strength of 261 MPa, showing good comprehensive mechanical properties.

[0054] Example 3

[0055] This embodiment includes the following steps:

[0056] Step 1: Using a stranding machine, 6 AZ91 magnesium alloy wires with a diameter of 1 mm are stranded at 45° on the outside of a TA1 titanium wire with a diameter of 1 mm to obtain a titanium core magnesium stranded wire with a diameter of 3 mm. Next, 12 TA1 titanium wires with a diameter of 1 mm are stranded at 45° on the outside of the obtained titanium core magnesium stranded wire to obtain a three-layer stranded wire with a diameter of 5 mm. Then, 18 1 mm AZ91 magnesium alloy wires are stranded at 45° on the outside of the obtained three-layer stranded wire to obtain a four-layer stranded wire with a diameter of 7 mm. Finally, 6 four-layer stranded wires are stranded on 1 four-layer stranded wire at 45° to obtain a magnesium-titanium preform with a diameter of 21 mm.

[0057] Step 2: inserting the magnesium-titanium preform obtained in step 1 into a preform melting furnace, wherein the preform melting furnace is inclined by 10 degrees, and the front end of the magnesium-titanium preform is extended out of the preform melting furnace, to obtain a charging preform melting furnace;

[0058] Step 3: Place the magnesium feed rod with the same composition as the magnesium alloy wire in step 1 into the feed melting chamber of the preform charging melting furnace obtained in step 2, then connect argon gas to the vent, and introduce argon gas into the preform charging melting furnace for 8 minutes, and then introduce coolant into the condensation jacket to obtain a preform melting furnace to be melted;

[0059] Step 4, open the first induction heating coil and the second induction heating coil, both of which are 50 mm in length, in the melting furnace of the preform to be melted obtained in step 3, and control the induction heating temperature to 680°C, so that the magnesium alloy wire and the magnesium filler rod in the magnesium-titanium preform are melted, and the titanium wire is not melted, to form molten magnesium and titanium, and then the part of the front end of the magnesium-titanium preform extending out of the preform melting furnace is pulled out at a speed of 60 mm / min, and the molten magnesium and titanium are driven to cool into a magnesium-titanium composite rod with a temperature of 400°C, and then the magnesium-titanium composite rod is continuously hot-rolled for multiple times at 400°C by a hot rolling mill to control the thickness to 1 mm, and a winding machine is used to coil it to obtain a magnesium-titanium composite plate.

[0060] Example 4

[0061] This embodiment includes the following steps:

[0062] Step 1: Using a stranding machine, 6 ZK61 magnesium alloy wires with a diameter of 1 mm are stranded at 45° on the outside of a TC4 titanium alloy wire with a diameter of 1 mm to obtain a titanium core magnesium stranded wire, and then the titanium core magnesium stranded wire is twisted three times to obtain a magnesium-titanium preform with a diameter of 27 mm;

[0063] Step 2: inserting the magnesium-titanium preform obtained in step 1 into a preform melting furnace, wherein the preform melting furnace is tilted 60°, and the front end of the magnesium-titanium preform is extended out of the preform melting furnace, to obtain a charging preform melting furnace;

[0064] Step 3: Place the magnesium feed rod with the same composition as the magnesium wire in step 1 into the feed melting chamber of the preform charging melting furnace obtained in step 2, then connect argon gas to the vent, and introduce argon gas into the preform charging melting furnace for 5 minutes, and then introduce coolant into the condensation jacket to obtain the preform melting furnace to be melted;

[0065] Step 4, open the first induction heating coil and the second induction heating coil, both of which are 100 mm in length, in the melting furnace of the preform to be melted obtained in step 3, and control the induction heating temperature to 700°C, so that the magnesium alloy wire and the magnesium filler rod in the magnesium-titanium preform are melted, and the titanium wire is not melted, to form molten magnesium and titanium, and then the part of the front end of the magnesium-titanium preform extending out of the preform melting furnace is pulled at a speed of 50 mm / min, and the molten magnesium and titanium are driven to cool into a magnesium-titanium composite rod with a temperature of 200°C, and then the magnesium-titanium composite rod is continuously hot-rolled for multiple times at 250°C by a hot rolling mill to control the thickness to 1 mm, and a winding machine is used to coil it to obtain a magnesium-titanium composite plate.

[0066] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A continuous casting and rolling device for magnesium-titanium composite materials, characterized in that: The device comprises a stranding machine (1), a preform melting furnace (2) is arranged at the outlet of the stranding machine (1), a first induction heating coil (3) is sleeved in the middle of the preform melting furnace (2), a hot rolling mill (4) is arranged at one end of the preform melting furnace (2) away from the stranding machine (1), and a winding machine (5) is arranged next to the hot rolling mill (4).

2. The continuous casting and rolling device of magnesium-titanium composite material according to claim 1, characterized in that: A condensation jacket (6) is provided on the side of the preform melting furnace (2) away from the stranding machine (1).

3. The continuous casting and rolling device of magnesium-titanium composite material according to claim 1, characterized in that: A vent (7) and a feeding melting chamber (8) are sequentially arranged on the preform melting furnace (2) on one side close to the stranding machine (1), and a second induction heating coil (9) is arranged on the feeding melting chamber (8).

4. A method for continuously casting and rolling a magnesium-titanium composite material using the device according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: Step 1: transporting magnesium wire and titanium wire to a stranding machine to strand them into bundles to obtain a magnesium-titanium preform; the material of the magnesium wire is magnesium alloy, and the material of the titanium wire is titanium or titanium alloy; Step 2: inserting the magnesium-titanium preform obtained in step 1 into the preform melting furnace, and making the front end of the magnesium-titanium preform extend out of the preform melting furnace, so as to obtain a charging preform melting furnace; Step 3: placing a magnesium feed rod having the same composition as the magnesium wire in step 1 into the feed melting chamber of the preform charging melting furnace obtained in step 2, then connecting argon gas to the vent, and introducing argon gas into the preform charging melting furnace, and then introducing coolant into the condensation jacket to obtain a preform melting furnace to be melted; Step 4, opening the first induction heating coil and the second induction heating coil in the melting furnace of the preform to be melted obtained in step 3, so that the magnesium wire and the magnesium filler rod in the magnesium-titanium preform are melted, and the titanium wire is not melted, to form molten magnesium and titanium, and then the part of the magnesium-titanium preform that extends out of the preform melting furnace is pulled, and the molten magnesium and titanium are driven to cool into magnesium-titanium composite rods, and then the magnesium-titanium composite rods are continuously hot-rolled for multiple times by a hot rolling mill, and finally a winder is used to wind them to obtain a magnesium-titanium composite plate.

5. The method according to claim 4, characterized in that In step 2, the preform melting furnace is tilted downward by 5° to 60° at one end close to the hot rolling mill.

6. The method according to claim 4, characterized in that After the argon gas is introduced in step 3, step 4 is performed 5 to 10 minutes later.

7. The method according to claim 4, characterized in that In step 4, the lengths of the first induction heating coil and the second induction heating coil are both 50 mm to 100 mm, and the heating temperatures of the first induction heating coil and the second induction heating coil are both 660° C. to 700° C.

8. The method according to claim 4, characterized in that The cooling in step 4 is to cool the molten magnesium-titanium preform to 200°C to 400°C.

9. The method according to claim 4, characterized in that The pulling speed in step 4 is 40 mm / min to 60 mm / min.

10. The method according to claim 4, characterized in that The temperature of the multiple continuous hot rolling in step 4 is 250°C to 400°C.

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