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

Abstract

The application discloses a magnesium-titanium composite material continuous casting and rolling device, which comprises a stranding machine, a preform smelting furnace, a hot rolling machine and a winding machine, and a first induction heating coil is sleeved in the middle of the preform smelting furnace; and the application further provides a preparation method of the magnesium-titanium composite material, wherein magnesium wire materials and titanium wire materials are stranded into a bundle to obtain a magnesium-titanium preform, the preform is then smelted in the preform smelting furnace and pulled and cooled, and then hot rolling and winding are carried out to obtain a magnesium-titanium composite plate material. The magnesium wire materials and the titanium wire materials are stranded into a bundle through the stranding machine, the magnesium-titanium preform is smelted through the preform smelting furnace, the magnesium-titanium preform is continuously hot rolled for multiple times through the hot rolling machine, and finally the winding machine is used for winding, so that the magnesium alloy plate material is prepared through the method of segmented melting, continuous cooling and continuous rolling; the preparation speed is controllable, the process is continuous, the production efficiency is greatly improved, and the continuous and efficient preparation of the magnesium-titanium composite material is realized.

Description

TECHNICAL FIELD

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

[0002] Magnesium and magnesium alloy is a kind of metal material with hexagonal close-packed crystal structure, and the density is about 1.8 g / cm 3 It is the lightest metal structural material and has a wide application prospect in the field of lightweight. Although the specific strength and specific stiffness of magnesium alloy are high, the absolute strength is low, and the plasticity at room temperature is poor, so that it is difficult to meet the required mechanical properties of components, and the application range is limited. With the progress of science and technology, the requirements of human society for material performance are getting higher and higher, and single material has been unable to meet the requirements; and two or more than two materials with different properties are prepared into composite materials through physical or chemical methods, so that the performance advantages of heterogeneous materials can be fully utilized, and the composite materials exhibit excellent comprehensive performance, thereby meeting various different requirements.

[0003] The density of titanium and titanium alloy is about 4.5 g / cm 3 , and the 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 the fields of aerospace, transportation, electronics 3C, etc., and is also a high-quality lightweight material.

[0004] Therefore, magnesium-titanium composite not only does not affect the lightweight effect of the final material, but also improves the comprehensive mechanical properties of the material. At present, the methods for magnesium-titanium composite mainly include powder metallurgy, casting, melt infiltration, hot rolling, welding, etc. Different processes have different characteristics, such as magnesium-titanium composite through casting, which needs to be uniformly distributed by stirring and other methods, melt infiltration needs to be pre-printed with titanium alloy preform, hot rolling needs to consider the interface bonding quality, and powder metallurgy has low preparation efficiency.

[0005] Therefore, a new method for preparing magnesium-titanium composite material is urgently needed, which can not only realize the effective combination of magnesium and titanium, but also realize the batch production of large size and large scale, so as to meet the diversified and lightweight requirements of future products, and broaden the application prospect of the material. SUMMARY

[0006] The technical problems to be solved by the present application are to provide a magnesium-titanium composite material continuous casting and rolling device to solve the above problems of the prior art.

[0007] To solve the above technical problems, the present application adopts the technical scheme of a magnesium-titanium composite material continuous casting and rolling device, characterized in that the device comprises a stranding machine, an outlet of the stranding machine is provided with a preform melting furnace, a first induction heating coil is sleeved in the middle of the preform melting furnace, a hot rolling machine is arranged at an end of the preform melting furnace away from the stranding machine, and a winding machine is arranged beside the hot rolling machine.

[0008] The magnesium-titanium composite material continuous casting and rolling device is characterized in that a condensing sleeve is sleeved on the side of the preform melting furnace away from the stranding machine.

[0009] The magnesium-titanium composite material continuous casting and rolling device is characterized in that a gas inlet and a material supplementing melting cavity are sequentially arranged on the side of the preform melting furnace close to the stranding machine, and a second induction heating coil is arranged on the material supplementing melting cavity.

[0010] In addition, the present application further provides a method for continuously casting and rolling magnesium-titanium composite material, characterized in that the method comprises the following steps:

[0011] Step one, magnesium wire material and titanium wire material are transported to the stranding machine to be stranded into a bundle to obtain a magnesium-titanium preform; the magnesium wire material is magnesium alloy, and the titanium wire material is titanium or titanium alloy;

[0012] Step two, the magnesium-titanium preform obtained in step one is inserted into the preform melting furnace, and the front end of the magnesium-titanium preform extends out of the preform melting furnace to obtain a loaded preform melting furnace;

[0013] Step three, magnesium material supplementing rods with the same composition as the magnesium wire material in step one are placed in the material supplementing melting cavity of the loaded preform melting furnace obtained in step two, then argon is connected to the gas inlet and introduced into the loaded preform melting furnace, and cooling liquid is introduced into the condensing sleeve to obtain a to-be-melted preform melting furnace;

[0014] Step four, open the first induction heating coil and the second induction heating coil in the smelting furnace of the magnesium-titanium preform obtained in step three, melt the magnesium wire material and the magnesium filler rod material in the magnesium-titanium preform, and the titanium wire material is not melted, form molten magnesium and titanium, then pull the part of the magnesium-titanium preform extending out of the preform smelting furnace, and drive the molten magnesium and titanium to cool into a magnesium-titanium composite rod, then use a hot rolling machine to continuously hot roll the magnesium-titanium composite rod multiple times, and finally use a winding machine to wind up, to obtain a magnesium-titanium composite plate.

[0015] The magnesium wire material and the titanium wire material are first sent to a stranding machine to be stranded into a bundle to form a magnesium-titanium preform with three-dimensional interlocking, close arrangement and mutual restraint, then smelting is performed to melt the magnesium wire material and the magnesium filler rod material with low melting point, and the titanium wire material is not melted and maintains the original spatial structure, wherein the magnesium filler rod material is used to fill the gap formed by stranding the magnesium-titanium wire material, so that the molten magnesium completely wraps the titanium wire material according to the stranded spatial structure, the part of the magnesium-titanium preform extending out of the preform smelting furnace is pulled to drive the molten magnesium and titanium to move to the condensing sleeve, and further cooling is performed to cool the molten magnesium-titanium into a magnesium-titanium composite rod, and finally multiple continuous hot rolling and winding are performed to obtain a magnesium-titanium composite plate.

[0016] In step one, a stranding process is designed according to needs to obtain a magnesium-titanium preform with different magnesium-titanium spatial distributions and different diameters.

[0017] The method has the feature that the preform smelting furnace is inclined downward by 5°-60° at the end close to the hot rolling machine. The preform smelting furnace is inclined to facilitate the flow of the molten magnesium-titanium preform to the condensing sleeve and facilitate cooling.

[0018] The method has the feature that step four is performed 5-10 minutes after the argon is introduced in step three. The argon is introduced for a period of time to remove other gases in the preform smelting furnace, prevent impurity gases from affecting the magnesium-titanium preform, and prevent oxidation.

[0019] The method has the feature that the length of the first induction heating coil and the second induction heating coil is 50-100 mm in step four, and the temperature heated by the first induction heating coil and the second induction heating coil is 660-700℃. The length of the hot coil is controlled to control the amount of the magnesium wire material and the magnesium filler rod material to be melted, and the temperature is controlled to ensure that the magnesium wire material and the magnesium filler rod material are melted and the titanium wire material is not melted.

[0020] The method has the characteristics that the cooling in the fourth step is to cool the molten magnesium-titanium preform to 200-400 DEG C. The application controls the temperature of the cooling to ensure the solidification of the molten magnesium, and meanwhile, a certain temperature is left for the subsequent hot rolling to reduce the heating of the hot rolling.

[0021] The method has the characteristics that the pulling speed in the fourth step is 40-60 mm / min. The application controls the pulling speed to ensure the sufficient melting of the magnesium wire and the magnesium supplement rod, and also to ensure the solidification of the molten magnesium.

[0022] It should be noted that when the magnesium-titanium preform is pulled, the wire twisting machine feeds the magnesium wire and the titanium wire into the preform melting furnace at the same speed to obtain the magnesium-titanium preform.

[0023] The method has the characteristics that the temperature of the multiple continuous hot rolling in the fourth step is 250-400 DEG C. The application controls the rolling temperature to be higher than the dynamic recrystallization temperature of magnesium, which is helpful to the rolling and improves the performance of the magnesium-titanium composite plate.

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

[0025] 1. The magnesium wire and the titanium wire are twisted into a bundle by the wire twisting machine to form a magnesium-titanium preform, the magnesium-titanium preform is penetrated and taken out of the preform melting furnace, the magnesium-titanium preform left in the preform melting furnace is melted, the molten magnesium-titanium preform is pulled out and cooled to a magnesium-titanium composite rod when the magnesium-titanium preform taken out of the preform melting furnace is pulled, the hot rolling machine is arranged and connected in series at the rear end of the preform melting furnace, the magnesium-titanium composite rod is continuously hot rolled multiple times, and finally the winding machine is used for winding. The whole device has the advantages of simple structure, convenient operation, and can produce magnesium-titanium composite plates of different sizes according to actual needs.

[0026] 2. The magnesium alloy plate is prepared by the method of segmental melting, continuous cooling and continuous rolling, the preparation speed is controllable, the process is continuous, the production efficiency is greatly improved, and the continuous and efficient preparation of the magnesium-titanium composite material is realized.

[0027] 3. The application can fully utilize the waste heat after melting, and the hot rolling can be performed without secondary heating or with partial secondary heating, thereby effectively saving energy.

[0028] 4. The magnesium-titanium composite plate prepared by the application has the advantages of tight magnesium-titanium combination and uniform titanium alloy distribution, the magnesium alloy and the titanium alloy are deformed during the rolling process, and the microstructure is overall optimized and controlled.

[0029] 5、The magnesium-titanium composite material is effectively compounded, and the obtained composite plate has outstanding performance.

[0030] The technical solutions of the present application are described in further detail below with reference to the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 Fig. 1 is a structural schematic diagram of a magnesium-titanium composite material continuous casting and rolling device in the present application.

[0032] Figure 2 Fig. 2 is a structural schematic diagram of a preform smelting furnace in the present application.

[0033] Figure 3 Fig. 3 is a metallographic diagram of a longitudinal section of a magnesium-titanium composite plate obtained in Example 2 of the present application.

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

[0035] BRIEF DESCRIPTION OF DRAWINGS

[0036] 1 - stranding machine; 2 - preform smelting furnace; 3 - first induction heating coil;

[0037] 4 - hot rolling mill; 5 - winding machine; 6 - condensing sleeve;

[0038] 7 - air vent; 8 - supplementary material smelting cavity; 9 - second induction heating coil;

[0039] 10 - magnesium-titanium preform; 11 - magnesium supplementary material rod. DETAILED DESCRIPTION

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

[0041] Example 1

[0042] As Figure 1 and Figure 2As shown in the figure, the magnesium-titanium composite material continuous casting and rolling device of the embodiment comprises a stranding machine 1, a prefabricated body smelting 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 prefabricated body smelting furnace 2, a hot rolling machine 4 is arranged at the end of the prefabricated body smelting furnace 2 away from the stranding machine 1, and a winding machine 5 is arranged beside the hot rolling machine 4. The magnesium wire and the titanium wire are stranded into a bundle by the stranding machine 1 to form a magnesium-titanium prefabricated body 10. The magnesium-titanium prefabricated body 10 is penetrated and passed out of the prefabricated body smelting furnace 2 by the prefabricated body smelting furnace 2, so that the magnesium-titanium prefabricated body 10 remaining in the prefabricated body smelting furnace 2 is smelted. When the magnesium-titanium prefabricated body 10 passing out of the prefabricated body smelting furnace 2 is pulled, the smelted magnesium-titanium prefabricated body 10 is pulled out and cooled to become a magnesium-titanium composite rod. The hot rolling machine 4 is arranged in series at the rear end of the prefabricated body smelting furnace 2, and the magnesium-titanium composite rod is continuously hot-rolled for multiple times. Finally, the winding machine 5 is used for winding to obtain a magnesium-titanium composite plate.

[0043] As shown in the figure, Figure 1 and Figure 2 As shown in the figure, a condensation sleeve 6 is sleeved on the prefabricated body smelting furnace 2 away from the stranding machine 1. The condensation sleeve 6 accelerates the cooling of the molten magnesium to ensure that the molten magnesium and titanium are cooled and formed.

[0044] As shown in the figure, Figure 1 and Figure 2 As shown in the figure, a gas inlet 7 and a material supplementing smelting cavity 8 are sequentially arranged on the prefabricated body smelting furnace 2 close to the stranding machine 1, and the material supplementing smelting cavity 8 is provided with a second induction heating coil 9. The gas inlet 7 is arranged to facilitate the introduction of protective gas into the prefabricated body smelting furnace 2 to prevent oxidation during smelting. The material supplementing smelting cavity 8 is arranged and provided with the second induction heating coil 9 to facilitate the melting of the magnesium material supplementing rod 11 in the material supplementing smelting cavity 8 to supplement magnesium into the prefabricated body smelting furnace 2.

[0045] The preparation method of the magnesium-titanium composite plate is described in detail in Embodiments 2-4.

[0046] Embodiment 2

[0047] The embodiment comprises the following steps:

[0048] Step one, six AZ31 magnesium alloy wires with a diameter of 1 mm are stranded outside TA1 titanium wires with a diameter of 1 mm in a 45° direction by a stranding machine to obtain titanium core magnesium stranded wires, and then the titanium core magnesium stranded wires are repeatedly stranded three times to obtain a magnesium-titanium prefabricated body with a diameter of 27 mm;

[0049] Step two, the magnesium-titanium prefabricated body obtained in step one is inserted into a prefabricated body smelting furnace, the prefabricated body smelting furnace is inclined by 5°, and the front end of the magnesium-titanium prefabricated body is stretched out of the prefabricated body smelting furnace to obtain a prefabricated body smelting furnace with loading;

[0050] Step three, put the magnesium supplement rod material with the same composition as the magnesium alloy wire in step one into the supplement melting cavity of the charging preform melting furnace obtained in step two, then connect argon to the gas inlet, and pass argon into the charging preform melting furnace for 10 minutes, and then pass the cooling liquid into the condensing sleeve to obtain the preform melting furnace to be melted;

[0051] Step four, turn on the first induction heating coil and the second induction heating coil in the preform melting furnace to be melted obtained in step three, both with a length of 60 mm, and control the induction heating temperature to be 680℃, so that the magnesium alloy wire and the magnesium supplement rod material in the magnesium-titanium preform are melted, and the titanium wire material is not melted, forming molten magnesium and titanium, then pull the part of the magnesium-titanium preform protruding out of the preform melting furnace at a speed of 40 mm / min, and drive the molten magnesium and titanium to cool to a magnesium-titanium composite rod material with a temperature of 300℃, then use a hot rolling machine to continuously hot roll the magnesium-titanium composite rod material at 300℃ to control the thickness to be 1 mm, and use a winding machine to wind up, to obtain a magnesium-titanium composite plate material.

[0052] Figure 3 The metallographic phase diagram of the longitudinal section of the magnesium-titanium composite plate material obtained in this embodiment can be seen from Figure 3 It can be seen from the metallographic phase diagram of the longitudinal section of the magnesium-titanium composite plate material obtained in this embodiment that the titanium alloy wire material in the magnesium-titanium composite plate material has undergone obvious plastic deformation, changing from a circular shape to an irregular shape and forming a sawtooth engagement with the magnesium matrix, in addition, the magnesium alloy matrix grains are obviously refined.

[0053] Figure 4 The tensile stress-strain curve of the magnesium-titanium composite plate material obtained in this embodiment can be seen from Figure 4 It can be seen from the tensile stress-strain curve of the magnesium-titanium composite plate material obtained in this embodiment that the magnesium-titanium composite plate material has a breaking 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 one, twist 6 AZ91 magnesium alloy wires with a diameter of 1 mm outside TA1 titanium wires with a diameter of 1 mm in a 45° direction by a wire twisting machine to obtain titanium core magnesium wires with a diameter of 3 mm, then twist 12 TA1 titanium wires with a diameter of 1 mm outside the obtained titanium core magnesium wires in a 45° direction to obtain three-layer wires with a diameter of 5 mm, then twist 18 AZ91 magnesium alloy wires with a diameter of 1 mm outside the obtained three-layer wires in a 45° direction to obtain four-layer wires with a diameter of 7 mm, and finally twist 6 four-layer wires in a 45° direction on 1 four-layer wire to obtain a magnesium-titanium preform with a diameter of 21 mm;

[0057] Step two, the magnesium-titanium preform obtained in step one is inserted into a preform smelting furnace, wherein the preform smelting furnace is inclined by 10°, and the front end of the magnesium-titanium preform is extended out of the preform smelting furnace to obtain a charged preform smelting furnace;

[0058] Step three, a magnesium supplement rod material with the same composition as the magnesium alloy wire material in step one is placed in the supplement smelting cavity of the charged preform smelting furnace obtained in step two, then argon is connected to the gas inlet, and argon is introduced into the charged preform smelting furnace for 8 min, and then a cooling liquid is introduced into the condensing sleeve to obtain a preform smelting furnace to be smelted;

[0059] Step four, the first and second induction heating coils with a length of 50 mm in the preform smelting furnace to be smelted obtained in step three are turned on, and the induction heating temperature is controlled to be 680℃, so that the magnesium alloy wire material and the magnesium supplement rod material in the magnesium-titanium preform are melted, and the titanium wire material is not melted to form molten magnesium and titanium, then the part of the magnesium-titanium preform extending out of the preform smelting furnace is pulled out at a speed of 60 mm / min, and the molten magnesium and titanium are cooled to a magnesium-titanium composite rod material with a temperature of 400℃, then a hot rolling machine is used to continuously hot roll the magnesium-titanium composite rod material at 400℃ to control the thickness to be 1 mm, and a winding machine is used for winding to obtain a magnesium-titanium composite plate material.

[0060] Example 4

[0061] This example includes the following steps:

[0062] Step one, a titanium core magnesium stranded wire is obtained by twisting six ZK61 magnesium alloy wires with a diameter of 1 mm outside a TC4 titanium alloy wire with a diameter of 1 mm along a direction of 45° by using a stranding machine, then the titanium core magnesium stranded wire is repeatedly twisted for three times according to the above-mentioned twisting process to obtain a magnesium-titanium preform with a diameter of 27 mm;

[0063] Step two, the magnesium-titanium preform obtained in step one is inserted into a preform smelting furnace, wherein the preform smelting furnace is inclined by 60°, and the front end of the magnesium-titanium preform is extended out of the preform smelting furnace to obtain a charged preform smelting furnace;

[0064] Step three, a magnesium supplement rod material with the same composition as the magnesium wire material in step one is placed in the supplement smelting cavity of the charged preform smelting furnace obtained in step two, then argon is connected to the gas inlet, and argon is introduced into the charged preform smelting furnace for 5 min, and then a cooling liquid is introduced into the condensing sleeve to obtain a preform smelting furnace to be smelted;

[0065] Step four, open the first induction heating coil and the second induction heating coil with a length of 100 mm in the preform melting furnace obtained in step three, control the induction heating temperature to be 700 DEG C, melt the magnesium alloy wire material and the magnesium supplement rod material in the magnesium-titanium preform, and the titanium wire material is not melted, form molten magnesium and titanium, then pull the part of the magnesium-titanium preform at the front end of the preform melting furnace at a speed of 50 mm / min, and drive the molten magnesium and titanium to cool to a magnesium-titanium composite rod material with a temperature of 200 DEG C, then use a hot rolling machine to continuously hot roll the magnesium-titanium composite rod material at 250 DEG C to control the thickness to be 1 mm, and use a winding machine to wind up, to obtain a magnesium-titanium composite plate material.

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

Claims

1. A method for preparing a magnesium-titanium composite material using a continuous casting and rolling device, characterized in that: The device comprises a stranding machine (1), a preform melting furnace (2) is provided 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 provided at one end of the preform melting furnace (2) away from the stranding machine (1), and a winding machine (5) is provided next to the hot rolling mill (4); The method comprises the following steps: Step 1: transporting magnesium wire and titanium wire to a stranding machine to be stranded 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 allowing the front end of the magnesium-titanium preform to extend out of the preform melting furnace to obtain a charged preform melting furnace; Step 3: Place 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 connect argon gas to the vent and introduce argon gas into the preform charging melting furnace, and then introduce coolant into the condensing jacket to obtain a preform melting furnace to be melted; Step 4: Open 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 to melt the magnesium wire and the magnesium filler rod in the magnesium-titanium preform, while the titanium wire does not melt, to form molten magnesium and titanium, and then pull the part of the magnesium-titanium preform that extends out of the preform melting furnace, and drive the molten magnesium and titanium to cool into a magnesium-titanium composite rod, and then use a hot rolling mill to continuously hot-roll the magnesium-titanium composite rod for multiple times, and finally use a winder to wind it to obtain a magnesium-titanium composite plate.

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

4. The method for preparing a magnesium-titanium composite material using a continuous casting and rolling device according to claim 1, characterized in that: The preform melting furnace in step 2 is tilted downward by 5° to 60° near one end of the hot rolling mill.

5. The method for preparing a magnesium-titanium composite material using a continuous casting and rolling device according to claim 1, characterized in that: After the argon gas is introduced in step 3, proceed to step 4 5 to 10 minutes later.

6. The method for preparing a magnesium-titanium composite material using a continuous casting and rolling device according to claim 1, 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.

7. The method for preparing a magnesium-titanium composite material using a continuous casting and rolling device according to claim 1, characterized in that: The cooling in step 4 is to cool the molten magnesium-titanium preform to 200° C. to 400° C.

8. The method for preparing a magnesium-titanium composite material using a continuous casting and rolling device according to claim 1, characterized in that: The pulling speed in step 4 is 40 mm / min to 60 mm / min.

9. The method for preparing a magnesium-titanium composite material using a continuous casting and rolling device according to claim 1, characterized in that: The temperature of the multiple continuous hot rolling in step 4 is 250°C~400°C.

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