Magnesium alloy coiled material production device and method and magnesium alloy coiled material

Abstract

The invention provides a magnesium alloy coiled material production device and method and a magnesium alloy coiled material, and belongs to the technical field of metal material production, magnesium alloy ingots are preheated through a transversely arranged preheating channel, and large-batch continuous production can be achieved; through the structural design of the first siphon pipeline, the second siphon pipeline and the standing furnace, magnesium liquid components before cast rolling are uniform and clean, and therefore a high-quality magnesium alloy cast-rolled plate strip is obtained; through the integral structural design of the melting mechanism, the melt conveying mechanism, the strip production mechanism and the coiled material processing mechanism, magnesium alloy ingots are sequentially subjected to the processes of preheating, melting, standing, cast rolling, coiled material processing and the like, the magnesium alloy ingots are continuously produced into wide coiled materials, the traditional process is simplified, the production efficiency and the yield are greatly improved, and the production cost is reduced. And the multiple heating and rolling processes of the casting blank in the traditional process are omitted, and large-scale and commercial production of the product can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal material production, and more specifically, to a magnesium alloy coil production device and method and a magnesium alloy coil. Background Art

[0002] Magnesium alloy is the lightest practical metal that can be used for structural materials. The strength and stiffness of magnesium alloy are significantly better than plastic, and the impact resistance is better than aluminum alloy. In addition, magnesium alloy is renewable and is a green and environmentally friendly material. Based on the characteristics of magnesium alloy products and the concept of lightweight downstream products, the market demand for magnesium alloy products is no longer limited to industrial sectors such as aviation, aerospace, transportation, chemical industry, and rockets. The greater market demand comes from the automotive, communications electronics, and 3C industries.

[0003] At present, magnesium alloy products are mainly concentrated in castings, and the production capacity for composite materials and wide-width plates and strips is relatively weak. Due to the immaturity of the process, the width of the cast-rolled strip is mainly below 1000mm, with low production efficiency and poor product quality. In traditional rolling, magnesium alloy cast-rolled plates are generally obtained by heating and rolling flat ingots multiple times. The process is complex, the degree of continuity is low, the production cost is high and the yield is low. It is difficult to form large-scale production and cannot meet the continuous production needs of wide-width magnesium alloy coils. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a magnesium alloy coil production device, method and magnesium alloy coil to solve the problems of complex process, low degree of continuity and high impurity content in the product, resulting in low yield, etc. in the conventional magnesium alloy coil production process in the prior art.

[0005] The magnesium alloy coil production device provided by the present invention comprises a melting mechanism, a molten metal conveying mechanism, a strip production mechanism and a coil processing mechanism; wherein:

[0006] The melting mechanism comprises a transversely arranged preheating channel and a melting furnace connected to a discharge port of the preheating channel through a feeding pipe;

[0007] The molten liquid conveying mechanism comprises a casting furnace connected to the liquid material layer of the melting furnace through a first siphon pipe, a static furnace connected to the middle layer of the casting furnace through a second siphon pipe, and a heating box connected to the discharge port of the static furnace through a liquid material pipe with a mechanical pump;

[0008] The strip production mechanism comprises a casting nozzle arranged at the slurry flow port of the heating box, a casting and rolling mill arranged at the liquid outlet of the casting nozzle, and a lead-out roller arranged at the outlet of the casting and rolling mill; the liquid outlet of the casting nozzle is butted against the roll gap of the casting and rolling mill;

[0009] The coil processing mechanism includes a strip conveyor line docked with the outlet of the export roller and a coiler arranged at the outlet of the strip conveyor line; the strip conveyor line includes an inlet pinch roller docked with the outlet of the export roller and an outlet turning pinch roller arranged on the outlet side of the inlet pinch roller; the coiler is arranged on the outlet side of the outlet turning pinch roller.

[0010] In addition, a preferred solution is that a lifting device is connected to the preheating channel, a temperature detection device is arranged on the preheating channel, and the lifting control system of the lifting device is in signal connection with the temperature detection device.

[0011] In addition, a preferred solution is that a first temperature measuring element is arranged in the melting furnace; and / or, a second temperature measuring element is arranged in the casting furnace; and / or, a third temperature measuring element is arranged in the holding furnace; and / or, a first heating structure is arranged on the outer side wall of the first siphon pipe; and / or, a second heating structure is arranged on the outer side wall of the second siphon pipe.

[0012] In addition, a preferred solution is that a smoke hood is arranged above the export roller along the strip conveying direction; the smoke hood is arranged above the strip conveyor line.

[0013] In addition, a preferred solution is that a thickness gauge, an edge trimming machine, a scrap edge shear and a transverse cutting shear are sequentially arranged on the strip conveyor line along the strip conveying direction.

[0014] The magnesium alloy coil production method provided by the present invention uses the magnesium alloy coil production device as described above to produce magnesium alloy coils, and includes the following steps:

[0015] Feed the pre-surface-cleaned magnesium alloy ingot into the preheating channel, and adopt the heating method of hot air convection. After the internal temperature of the magnesium alloy ingot reaches the first preset temperature, put the magnesium alloy ingot into the melting furnace through the feeding pipeline, and carry out melting treatment on the magnesium alloy ingot to obtain molten magnesium.

[0016] Through the first siphon pipe, use the siphon principle to transport the molten magnesium in the liquid material layer of the melting furnace to the casting furnace.

[0017] When the liquid level of the molten magnesium in the casting furnace reaches the preset height, through the second siphon pipe, use the siphon principle to transport the molten magnesium in the middle layer of the casting furnace to the holding furnace.

[0018] Pump the molten magnesium in the holding furnace to the heating box through a liquid material pipe with a mechanical pump, keep the temperature of the molten magnesium in the heating box at the second preset temperature, and control the liquid level in the heating box to the preset liquid level height according to the flow rate of the molten magnesium in the heating box and the surface tension at the outlet of the casting nozzle.

[0019] Let the molten magnesium in the heating box be delivered through the casting nozzle into the roll gap of the casting and rolling rolls of the casting and rolling mill, and by passing cooling water through the casting and rolling rolls, process the molten magnesium into a solid strip material;

[0020] Feed the strip material into the strip conveyor line through the outlet rolls, and send the strip material to the coiler through the strip conveyor line;

[0021] Process the strip material into a magnesium alloy coil with a preset coil diameter through the coiler.

[0022] In addition, preferably, the first preset temperature is 100°C - 200°C; and / or, the temperature in the melting furnace is 690°C - 720°C; and / or, the second preset temperature is 700°C ± 10°C.

[0023] In addition, preferably, during the process of feeding the magnesium alloy ingot into the melting furnace through the feeding pipeline and melting the magnesium alloy ingot, continuously introduce a first protective gas into the melting furnace;

[0024] During the process of transporting the molten magnesium in the liquid material layer of the melting furnace to the casting furnace through the first siphon pipeline by using the siphon principle, continuously introduce a second protective gas into the casting furnace;

[0025] During the process of transporting the molten magnesium in the middle layer of the casting furnace to the holding furnace through the second siphon pipeline by using the siphon principle, continuously introduce a third protective gas into the holding furnace;

[0026] The first protective gas is a mixed gas composed of Ar, CO2, SO2, and dry air mixed in any proportion;

[0027] The second protective gas is a mixed gas composed of Ar, CO2, SO2, and dry air mixed in any proportion;

[0028] The third protective gas is a mixed gas composed of Ar, CO2, SO2, and dry air mixed in any proportion.

[0029] In addition, preferably, after processing the strip material into a magnesium alloy coil with a preset coil diameter through the coiler, it further includes:

[0030] Weigh the magnesium alloy coil, put a coil core on the magnesium alloy coil that meets the preset weight requirement to obtain a magnesium alloy coil with a coil core;

[0031] Place the magnesium alloy coil with a coil core in a heating furnace, perform horizontal heating, and carry out homogenization annealing treatment at 450°C ± 5°C;

[0032] The annealed magnesium alloy coil is successively subjected to continuous warm rolling and finishing.

[0033] The magnesium alloy coil provided by the present invention is processed and produced by using the above-mentioned production method of magnesium alloy coil.

[0034] As can be seen from the above technical solutions, the magnesium alloy coil production device, method and magnesium alloy coil provided by the present invention preheat the magnesium alloy ingot through a horizontally arranged preheating channel to meet the hourly output requirement and realize large-scale continuous production; through the structural design of the first siphon pipe, the second siphon pipe and the holding furnace, the composition of the molten magnesium before casting is made uniform and clean, so as to obtain a high-quality magnesium alloy cast-rolled strip; through the overall structural design of the melting mechanism, the molten liquid conveying mechanism, the strip production mechanism and the coil processing mechanism, the magnesium alloy ingot passes through the processes of preheating, melting, standing, casting and coil processing in sequence, and the magnesium alloy ingot is continuously produced into a wide-width coil, simplifying the traditional process, greatly improving the production efficiency and the yield rate, eliminating the multiple heating and rolling processes of the cast billet in the traditional process, enabling the product to be produced on a large scale and commercially; the maximum width of the strip can reach 2000 mm, and if subsequent continuous warm rolling and finishing are equipped, it can be widely used in the field of transportation lightweight, which is of great significance for promoting energy conservation and emission reduction in industries such as rail transit and automobiles.

[0035] To achieve the above and related purposes, one or more aspects of the present invention include the features described in detail later. The following description and the accompanying drawings illustrate certain exemplary aspects of the present invention in detail. However, these aspects only indicate some of the various ways in which the principles of the present invention can be used. In addition, the present invention aims to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easier to understand.

[0037] Figure 1 It is a schematic structural diagram of a magnesium alloy coil production device according to an embodiment of the present invention;

[0038] Figure 2 It is a schematic structural diagram of the melting mechanism and the molten liquid conveying mechanism according to an embodiment of the present invention;

[0039] Figure 3 It is a schematic structural diagram of the strip production mechanism according to an embodiment of the present invention;

[0040] Figure 4 It is a schematic structural diagram of the coil processing mechanism according to an embodiment of the present invention;

[0041] Figure 5Flow chart of a method for producing magnesium alloy coils according to an embodiment of the present invention;

[0042] Figure 6 It is a flow block diagram of a method for producing magnesium alloy coils according to an embodiment of the present invention.

[0043] In the drawings, 11 - preheating channel, 12 - feeding pipeline, 13 - melting furnace, 21 - first siphon pipeline, 22 - casting furnace, 23 - second siphon pipeline, 24 - holding furnace, 25 - mechanical pump, 26 - liquid pipe, 27 - heating box, 31 - casting nozzle, 32 - casting and rolling mill, 33 - guiding roller, 41 - coiler, 42 - inlet pinch roll, 43 - outlet turning pinch roll, 44 - thickness gauge, 45 - edge trimming machine, 46 - scrap edge shear, 47 - transverse cutting shear, 51 - first temperature measuring element, 52 - second temperature measuring element, 53 - third temperature measuring element, 6 - fume hood, 7 - coil trolley.

[0044] In all the drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed implementation manners

[0045] In view of the problems mentioned above, in the prior art, the traditional magnesium alloy coil production process has complex processes, low degree of continuity, high impurity content in the product, resulting in low yield, etc. A magnesium alloy coil production device, method and magnesium alloy coil are proposed.

[0046] The following will describe the specific embodiments of the present invention in detail with reference to the drawings.

[0047] To illustrate the magnesium alloy coil production device, method and magnesium alloy coil provided by the present invention, Figure 1 shows the structure of a magnesium alloy coil production device according to an embodiment of the present invention; Figure 2 shows the structure of a melting mechanism and a molten liquid conveying mechanism according to an embodiment of the present invention; Figure 3 shows the structure of a strip production mechanism according to an embodiment of the present invention; Figure 4 shows the structure of a coil processing mechanism according to an embodiment of the present invention; Figure 5 shows the process of a method for producing magnesium alloy coils according to an embodiment of the present invention; Figure 6 shows the process of a method for producing magnesium alloy coils according to an embodiment of the present invention.

[0048] As Figures 1 to 4 collectively shown, the magnesium alloy coil production device provided by the present invention includes a melting mechanism, a molten liquid conveying mechanism, a strip production mechanism and a coil processing mechanism; wherein,

[0049] The melting mechanism includes a horizontally arranged preheating channel 11 and a melting furnace 13 connected to the discharge port of the preheating channel 11 through a feeding pipeline 12;

[0050] The molten liquid conveying mechanism includes a casting furnace 22 connected to the liquid material layer of the melting furnace 13 through a first siphon pipe 21, a standing furnace 24 connected to the middle layer of the casting furnace 22 through a second siphon pipe 23, and a heating box 27 connected to the discharge port of the standing furnace 24 through a liquid material pipe 26 with a mechanical pump 25;

[0051] The strip production mechanism includes a casting nozzle 31 arranged at the slurry outlet of the heating box 27, a casting and rolling mill 32 arranged at the liquid outlet of the casting nozzle 31, and a guiding roller 33 arranged at the outlet of the casting and rolling mill 32; the liquid outlet of the casting nozzle 31 is butted against the roll gap of the casting and rolling rolls of the casting and rolling mill 32;

[0052] The coiled material processing mechanism includes a strip conveyor line butted against the outlet of the guiding roller 33 and a coiler 41 arranged at the outlet of the strip conveyor line; the strip conveyor line includes an inlet pinch roll 42 butted against the outlet of the guiding roller 33 and an outlet turning pinch roll 43 arranged on the outlet side of the inlet pinch roll 42; the coiler 41 is arranged on the outlet side of the outlet turning pinch roll 43.

[0053] It should be noted that: an electromagnetic or resistance heating structure or the like is arranged on the preheating channel 11 in the present invention to achieve its preheating effect, and the present invention does not make special limitations in this regard.

[0054] The magnesium alloy ingot is preheated through the horizontally arranged preheating channel 11 to meet the hourly output requirement and realize large - batch continuous production; through the structural design of the first siphon pipe 21, the second siphon pipe 23 and the standing furnace 24, the magnesium liquid composition before casting and rolling is made uniform and clean, so as to obtain a high - quality magnesium alloy cast - rolled strip; through the overall structural design of the melting mechanism, the molten liquid conveying mechanism, the strip production mechanism and the coiled material processing mechanism in the present invention, the magnesium alloy ingot passes through processes such as preheating, melting, standing, casting and rolling, and coiled material processing in sequence, and the magnesium alloy ingot is continuously produced into a wide - width coiled material, simplifying the traditional process, greatly improving the production efficiency and the finished product rate, eliminating the multiple heating and rolling processes of the cast billet in the traditional process, and enabling the product to be produced on a large scale and commercially; the maximum width of the strip can reach 2000 mm, and if subsequent continuous warm rolling and finishing are equipped, it can be widely used in the field of transportation lightweight, which is of great significance for promoting energy conservation and emission reduction in industries such as rail transit and automobiles.

[0055] As a preferred solution of the present invention, a coiled material trolley 7 is arranged at the outlet of the coiler 41.

[0056] Specifically, when the coil diameter of the coil meets the requirements, the coiled material trolley 7 can be driven under the coil, and the coil coiled by the coiler 41 is sent to the next procedure.

[0057] As a preferred solution of the present invention, the coiled material trolley 7 includes a vehicle body, a moving mechanism arranged at the bottom of the vehicle body, and a supporting roller arranged at the top of the vehicle body.

[0058] Specifically, the moving mechanism is preferably but not limited to structures such as wheels and sliders cooperating with moving tracks. The present invention does not make special limitations on this. The idler rollers provided on the top of the vehicle body are used to support the coil.

[0059] As a preferred embodiment of the present invention, a lifting device is connected to the preheating channel 11, and a temperature detection device is provided on the preheating channel 11. The lifting control system of the lifting device is in signal connection with the temperature detection device.

[0060] Specifically, the temperature detection device can be a thermocouple, a temperature sensor, etc., which is used to measure the temperature of the preheating channel 11 and send a signal to the lifting control system of the lifting device according to the preset temperature, so that when the temperature of the preheating channel 11 reaches the preset temperature, the lifting control system automatically lifts the preheating channel 11, so as to facilitate adding the preheated material in the preheating channel 11 into the melting furnace 13 through the feeding pipeline 12 for melting. Among them, the lifting device can be a small crane, a robotic arm, etc. The present invention does not make special limitations on this.

[0061] As a preferred embodiment of the present invention, a first temperature measuring element 51 is provided in the melting furnace 13; and / or, a second temperature measuring element 52 is provided in the casting furnace 22; and / or, a third temperature measuring element 53 is provided in the holding furnace 24; and / or, a first heating structure is provided on the outer side wall of the first siphon pipeline 21; and / or, a second heating structure is provided on the outer side wall of the second siphon pipeline 23.

[0062] Specifically, the first temperature measuring element 51, the second temperature measuring element 52, and the third temperature measuring element 53 can all be thermocouples, temperature sensors, etc. The present invention does not make special limitations on this, and they are used to monitor the temperature value of the molten liquid during the transmission process. The first heating structure and the second heating structure can be resistance heating coils, electromagnetic heating structures, etc., which are used to keep the solution warm and heated to ensure its fluidity.

[0063] As a preferred embodiment of the present invention, a smoke hood 6 is provided above the deflector roll 33 along the strip conveying direction; the smoke hood 6 is arranged above the strip conveying line.

[0064] Specifically, the smoke hood 6 is preferably a movable smoke hood. For example, a sliding track is arranged above the strip conveying line, and the smoke hood 6 is slidably arranged on the sliding track, so as to comprehensively collect the smoke generated in the initial stage of the vertical plate and meet the energy conservation and environmental protection requirements.

[0065] As a preferred embodiment of the present invention, a thickness gauge 44, a trimming machine 45, a scrap edge shear 46, and a flying shear 47 are sequentially arranged along the strip conveying direction on the strip conveying line.

[0066] Specifically, the cast-rolled sheet slides over the threading guide table and enters the thickness gauge 44 and the pressure rollers. The thickness gauge 44 measures the thickness of the strip. Subsequently, the edge trimmer 45 and the scrap shear 46 shear both sides of the strip, with each side being cut by 50 mm to prevent cracks from occurring during subsequent rolling. The flying shear 47 continuously shears the leading end portion until a qualified product is obtained, and it also facilitates the coiler jaws to grip the leading end.

[0067] As a preferred embodiment of the present invention, it further includes a main controller for strip thickness; the main controller for strip thickness is respectively connected to the thickness gauge 44 and the roll gap control system of the casting and rolling rolls of the casting and rolling mill 32.

[0068] Specifically, the value measured by the thickness gauge 44 forms a closed-loop feedback with the roll gap control system of the casting and rolling rolls, and according to the thickness of the strip, the roll gap of the casting and rolling rolls is adjusted in a timely manner so that the product thickness meets the preset thickness requirements.

[0069] As a preferred embodiment of the present invention, the casting and rolling mill 32 is arranged to slope downward from the outlet to the inlet direction, with an inclination angle of 15°.

[0070] Specifically, the casting and rolling mill 32 adopts a structure with a 15° backward inclination to prevent the magnesium liquid from flowing back into the heating tank 27 when the vertical plate fails or the machine stops.

[0071] As a preferred embodiment of the present invention, a pusher is provided at the outlet of the coiler 41.

[0072] Specifically, by providing a pusher at the outlet of the coiler 41, it is convenient to push the coil out from the outlet of the coiler 41.

[0073] As Figure 5 and Figure 6 As shown jointly, the method for producing magnesium alloy coils provided by the present invention uses the magnesium alloy coil production device as described above in the present invention to produce magnesium alloy coils, including the following steps:

[0074] Step S1: Feed the pre-surface-cleaned magnesium alloy ingot into the preheating channel 11, and adopt the hot air convection heating method to make the internal temperature of the magnesium alloy ingot reach the first preset temperature, and then input the magnesium alloy ingot into the melting furnace 13 through the feeding pipeline 12 to perform melting treatment on the magnesium alloy ingot to obtain magnesium liquid;

[0075] Step S2: Through the first siphon pipeline 21, use the siphon principle to transport the magnesium liquid in the liquid material layer of the melting furnace 13 to the casting furnace 22;

[0076] Step S3: When the liquid level of the magnesium liquid in the casting furnace 22 reaches the preset height, use the siphon principle to transport the magnesium liquid in the middle layer of the casting furnace 22 to the holding furnace 24 through the second siphon pipeline 23;

[0077] Step S4: Pump the molten magnesium in the static furnace 24 to the heating box 27 through the liquid material pipe 26 with a mechanical pump 25, keep the temperature of the molten magnesium in the heating box 27 at the second preset temperature, and control the liquid level in the heating box 27 to the preset liquid level height according to the flow rate of the molten magnesium in the heating box 27 and the surface tension at the outlet of the casting nozzle 31;

[0078] Step S5: Deliver the molten magnesium in the heating box 27 to the roll gap of the casting and rolling rolls of the casting and rolling mill 32 through the casting nozzle 31, and process the molten magnesium into a solid strip material by passing cooling water through the casting and rolling rolls;

[0079] Step S6: Feed the strip material into the strip conveyor line through the outlet roller 33, and send the strip material to the coiler 41 through the strip conveyor line;

[0080] Step S7: Process the strip material into a magnesium alloy coil with a preset coil diameter by the coiler 41.

[0081] As a preferred solution of the present invention, the first preset temperature is 100°C - 200°C; and / or, the temperature in the melting furnace 13 is 690°C - 720°C; and / or, the second preset temperature is 700°C ± 10°C.

[0082] It should be noted that: the first preset temperature is preferably but not limited to 100°C - 200°C; the temperature in the melting furnace 13 is preferably but not limited to 690°C - 720°C; the second preset temperature is preferably but not limited to 700°C ± 10°C.

[0083] As a preferred solution of the present invention, during the process of feeding the magnesium alloy ingot into the melting furnace 13 through the feeding pipeline 12 and melting the magnesium alloy ingot, a first protective gas is continuously introduced into the melting furnace 13;

[0084] During the process of transporting the molten magnesium in the liquid material layer of the melting furnace 13 to the casting furnace 22 through the first siphon pipeline 21 by using the siphon principle, a second protective gas is continuously introduced into the casting furnace 22;

[0085] During the process of transporting the molten magnesium in the middle layer of the casting furnace 22 to the static furnace 24 through the second siphon pipeline 23 by using the siphon principle, a third protective gas is continuously introduced into the static furnace 24;

[0086] The first protective gas is a mixed gas composed of Ar, CO2, SO2 and dry air mixed in any proportion;

[0087] The second protective gas is a mixed gas composed of Ar, CO2, SO2 and dry air mixed in any proportion;

[0088] The third protective gas is a mixed gas composed of Ar, CO2, SO2 and dry air mixed in any proportion.

[0089] Specifically, a mixed gas of Ar, CO2, SO2 and dry air is used as the protective gas in the melting furnace, casting furnace and holding furnace to protect the molten magnesium.

[0090] As a preferred embodiment of the present invention, after processing the strip material into a magnesium alloy coil with a preset coil diameter by the coiler 41, the following steps are further included:

[0091] Weigh the magnesium alloy coil, and put a coil core on the magnesium alloy coil that meets the preset weight requirement to obtain a magnesium alloy coil with a coil core;

[0092] Place the magnesium alloy coil with a coil core in a heating furnace for horizontal heating, and perform homogenization annealing treatment at 450°C ± 5°C;

[0093] Perform continuous warm rolling and finishing on the annealed magnesium alloy coil in sequence.

[0094] Specifically, before trimming the cast-rolled strip, two cuts need to be manually made on both sides of the strip to facilitate the trimming machine to cut the two sides. This solution has potential safety hazards and requires one worker. Therefore, an alternative solution is to add an automatic cutting device in front of the thickness gauge behind the casting and rolling mill to improve efficiency; the cast-rolled coil is placed in a furnace for coil-type high-temperature homogenization annealing, which can improve the plasticity of the alloy, but the time is long and the efficiency is slow. Induction heating devices for the upper and lower surfaces or a roller hearth furnace can be added before the coiler for continuous strip heating, which can greatly improve the production efficiency.

[0095] The magnesium alloy coil provided by the present invention is processed and produced by using the magnesium alloy coil production method as described above in the present invention.

[0096] In order to better illustrate the magnesium alloy coil production device, method and magnesium alloy coil provided by the present invention in detail, the following examples are given:

[0097] Example 1

[0098] Continuously produce AZ31B (AZ series) magnesium alloy ingots to obtain high-quality wide-width magnesium alloy strips with a thickness of 5 - 7 mm and a width of 1850 mm. The specific steps are as follows:

[0099] Clean the surface of the magnesium alloy ingot, and use the ingot-taking device to place the cleaned magnesium alloy ingot into the double-layer preheating channel 11 every 1 minute. Adopt hot air convection to make its internal temperature reach 100°C - 200°C. After preheating, lift the magnesium alloy ingot to the height of the pipeline connecting the melting furnace, and then it is sent into the feeding pipeline 12, and the magnesium alloy ingot is fed into the gas-fired melting furnace for melting. At this time, the temperature in the melting furnace 13 has reached 695°C, and a protective gas is continuously passed.

[0100] Using the siphon principle, a first siphon pipe 21 is installed between the gas melting furnace and the electric casting furnace, which has a heating function. It automatically transports the molten magnesium in the melting furnace 13 into the casting furnace 22, and controls the temperature of the molten magnesium and the liquid level in the furnace. Subsequently, with the same pipe system, that is, the second siphon pipe 23, the molten magnesium in the middle layer in the casting furnace 22 is transported into the holding furnace 24 for standing and heating and heat preservation. Finally, a mechanical pump 25 is used to stably pump the molten magnesium in the holding furnace 24 into the heating box 27 in front of the continuous casting and rolling mill 32, controlling the liquid level in the box. The liquid level accuracy is ±1 mm. When the box is not filled with molten magnesium at the beginning, it is purged and heated with argon, and a protective gas is used during later production. The temperature of the molten magnesium in the device is ensured to be around 700 °C, and the protective gas in the melting furnace 13, the casting furnace 22 and the holding furnace 24 all adopts a mixed gas of Ar, CO2, SO2 and dry air.

[0101] The molten magnesium flows into the casting nozzle 31 through the slurry outlet behind the heating box 27. The casting nozzle 31 distributes the molten magnesium into the roll gap of the continuous casting and rolling rolls. After passing through the rolls with cooling water, a solid plate-shaped material (strip material) is successfully formed. The continuously cast and rolled plate reaches the deflector roll 33 at the outlet of the continuous casting and rolling mill 32. A large amount of smoke will be generated at the initial stage of standing. A smoke hood 6 (preferably a movable smoke hood) is equipped behind the continuous casting and rolling mill 32 for smoke collection. Then, through the guide plate table that rises at the inlet of the inlet pinch roll 42, it reaches the inlet pinch roll 42.

[0102] The continuously cast and rolled plate slides over the threading guide plate table and enters the thickness gauge 44 and the pressure roll. The thickness gauge 44 measures the thickness of the strip, forming a closed-loop feedback with the roll gap of the continuous casting and rolling rolls. Subsequently, the edge trimming machine 45 shears both sides of the strip, and 50 mm can be cut on each side. The outlet shear is used to continuously shear the leading end to a width convenient for collection each time the standing is successfully and stably operated until a qualified product is obtained, and it is convenient for the reel jaws to clamp the leading end. Behind the outlet shear is the outlet turning pinch roll 43, which is equipped with an air knife to purge the possible dust and debris on the upper surface of the strip before coiling. The retractable threading guide plate and jaw auxiliary device at the outlet of the turning pinch roll assist in feeding the leading end into the jaws of the coiler.

[0103] When the coil diameter of the coil meets the requirements, the coil car 7 drives to the bottom of the coil. The idler rollers on the car support the coil. After the tail of the coil is coiled, the coiler reel contracts. The pusher and the coil car take the coil out of the coiler, weigh the coil through the weighing sensor, and finally put a coil core on the strip.

[0104] Finally, the continuously cast and rolled coil is horizontally heated in a heating furnace and homogenized annealed at 450 °C to improve the plasticity of the strip, and subsequent continuous rolling is carried out to obtain a warm-rolled coil with a thickness of 1 - 3 mm and a width of 1650 mm.

[0105] It should be noted that this embodiment is only for a detailed description of the magnesium alloy coil production device, method and magnesium alloy coil provided by the present invention in actual applications, and does not limit the technical solutions provided by the present invention.

[0106] As can be seen from the above specific embodiments, for the magnesium alloy coil production device, method and magnesium alloy coil provided by the present invention, the magnesium alloy ingot is preheated through a horizontally arranged preheating channel to meet the hourly output requirement and achieve large-scale continuous production; through the structural design of the first siphon pipe, the second siphon pipe and the holding furnace, the magnesium liquid composition before casting and rolling is made uniform and clean, so as to obtain a high-quality magnesium alloy cast-rolled strip; through the overall structural design of the melting mechanism, the molten liquid conveying mechanism, the strip production mechanism and the coil processing mechanism, the magnesium alloy ingot passes through the processes of preheating, melting, standing, casting and rolling, and coil processing in sequence, and the magnesium alloy ingot is continuously produced into a wide-width coil, simplifying the traditional process, greatly improving the production efficiency and the finished product rate, eliminating the multiple heating and rolling processes of the billet in the traditional process, enabling the product to be produced on a large scale and commercially; the maximum width of the strip can reach 2000 mm. If subsequent continuous warm rolling and finishing are equipped, it can be widely used in the field of transportation lightweight, which is of great significance for promoting energy conservation and emission reduction in industries such as rail transit and automobiles.

[0107] As described above with reference to the drawings by way of example, the magnesium alloy coil production device, method and magnesium alloy coil proposed according to the present invention are described. However, those skilled in the art should understand that various improvements can be made to the above-mentioned magnesium alloy coil production device, method and magnesium alloy coil proposed by the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the appended claims.

Claims

1. A magnesium alloy coil production device, characterized in that: It includes melting mechanism, melt conveying mechanism, strip production mechanism and coil processing mechanism; among which, The melting mechanism comprises a transversely arranged preheating channel and a melting furnace connected to a discharge port of the preheating channel through a feeding pipe; The molten liquid conveying mechanism comprises a casting furnace connected to the liquid material layer of the melting furnace through a first siphon pipe, a static furnace connected to the middle layer of the casting furnace through a second siphon pipe, and a heating box connected to the discharge port of the static furnace through a liquid material pipe with a mechanical pump; The strip production mechanism comprises a casting nozzle arranged at the slurry flow port of the heating box, a casting and rolling mill arranged at the liquid outlet of the casting nozzle, and a lead-out roller arranged at the outlet of the casting and rolling mill; the liquid outlet of the casting nozzle is butted against the roll gap of the casting and rolling mill; The coil processing mechanism includes a strip conveying line connected to the outlet of the lead-out roller and a coiler arranged at the outlet of the strip conveying line; the strip conveying line includes an inlet pinching roller connected to the outlet of the lead-out roller and an outlet steering pinching roller arranged on the outlet side of the inlet pinching roller; the coiler is arranged on the outlet side of the outlet steering pinching roller.

2. The magnesium alloy coil production device according to claim 1, characterized in that: A lifting device is connected to the preheating channel, and a temperature detection device is arranged on the preheating channel. The lifting control system of the lifting device is connected to the temperature detection device by signal.

3. The magnesium alloy coil production device according to claim 1, characterized in that: A first temperature measuring element is provided in the melting furnace; and / or, A second temperature measuring element is provided in the casting furnace; and / or, A third temperature measuring element is provided in the static furnace; and / or, A first heating structure is provided on the outer side wall of the first siphon pipe; and / or, A second heating structure is arranged on the outer side wall of the second siphon pipe.

4. The magnesium alloy coil production device according to claim 1, characterized in that: A fume hood is arranged above the lead-out roller along the strip conveying direction; the fume hood is arranged above the strip conveying line.

5. The magnesium alloy coil production device according to claim 1, characterized in that: A thickness gauge, a trimmer, a shredder and a cross-cutting shear are arranged in sequence on the strip conveying line along the strip conveying direction.

6. A method for producing a magnesium alloy coil, characterized in that: The magnesium alloy coil production device according to any one of claims 1 to 5 is used to produce the magnesium alloy coil, comprising the following steps: The magnesium alloy ingot which has been pre-cleaned on the surface is fed into the preheating channel, and after the internal temperature of the magnesium alloy ingot reaches a first preset temperature by means of hot air convection heating, the magnesium alloy ingot is fed into the melting furnace through the feeding pipe, and the magnesium alloy ingot is melted to obtain magnesium liquid; The magnesium liquid in the liquid material layer of the melting furnace is transported to the casting furnace by the first siphon pipe using the siphon principle; When the liquid level of the magnesium liquid in the casting furnace reaches a preset height, the magnesium liquid in the middle layer of the casting furnace is transported to the static furnace through the second siphon pipe by using the siphon principle; The magnesium liquid in the static furnace is pumped to the heating box through a liquid pipe with a mechanical pump, so that the temperature of the magnesium liquid in the heating box is maintained at a second preset temperature, and the liquid level in the heating box is controlled to be a preset liquid level height according to the flow rate of the magnesium liquid in the heating box and the surface tension at the outlet of the casting nozzle; The magnesium liquid in the heating box is distributed to the gap between the casting rolls of the casting and rolling mill through the casting nozzle, and the magnesium liquid is processed into a solid strip material by passing cooling water into the casting rolls; The strip material is fed into the strip conveying line through the lead-out roller, and the strip material is fed to the coiler through the strip conveying line; The strip material is processed into a magnesium alloy coil with a preset coil diameter by the coiling machine.

7. The method for producing a magnesium alloy coil according to claim 6, characterized in that: The first preset temperature is 100° C.-200° C.; and / or, The temperature in the melting furnace is 690° C.-720° C.; and / or, The second preset temperature is 700°C±10°C.

8. The method for producing a magnesium alloy coil according to claim 6, characterized in that: In the process of feeding the magnesium alloy ingot into the melting furnace through the feeding pipe and melting the magnesium alloy ingot, continuously introducing a first protective gas into the melting furnace; In the process of transporting the magnesium liquid in the liquid material layer of the melting furnace to the casting furnace through the first siphon pipe by using the siphon principle, continuously introducing a second protective gas into the casting furnace; In the process of transporting the magnesium liquid in the middle layer of the casting furnace to the static furnace through the second siphon pipe by using the siphon principle, continuously introducing a third protective gas into the static furnace; The first protective gas is a mixed gas formed by mixing Ar, CO2, SO2 and dry air in any proportion; The second protective gas is a mixed gas formed by mixing Ar, CO2, SO2 and dry air in any proportion; The third protective gas is a mixed gas formed by mixing Ar, CO2, SO2 and dry air in any proportion.

9. The method for producing a magnesium alloy coil according to claim 6, characterized in that: After the strip material is processed into a magnesium alloy coil with a preset coil diameter by the coiling machine, the method further comprises: Weighing the magnesium alloy coil, and putting a winding core on the magnesium alloy coil that meets the preset weight requirement to obtain a magnesium alloy coil with a winding core; Placing the magnesium alloy coil with the coil core in a heating furnace, performing horizontal heating, and performing homogenization annealing treatment at 450° C.±5° C.; The magnesium alloy coil after annealing is subjected to continuous warm rolling and finishing in sequence.

10. A magnesium alloy coil, characterized in that: The magnesium alloy coil is produced by the magnesium alloy coil production method as described in any one of claims 1 to 9.

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