CN102229044A - Wide magnesium alloy ultra-thin plate continuous extrusion device and method - Google Patents

Abstract

The invention discloses a continuous extrusion device for wide-width magnesium alloy ultra-thin plates, including an extrusion device, a continuous rolling device and a leveling device; the extrusion device includes an extrusion barrel and a "W"-shaped extrusion die, " There is a "W" gap on the W"-shaped extrusion die; the continuous rolling device is composed of multiple sets of rolling transfer rollers, and each set of rolling transfer rollers is composed of an upper rolling roll and a lower rolling roll There are "W"-shaped protrusions on the rollers, and "W"-shaped grooves on the lower rolling plate rollers; the leveling device is composed of multiple sets of leveling rolls, and each set of leveling rolls is composed of an upper leveling roll and a lower leveling roll , the upper leveling roller and the lower leveling roller are cylindrical; the continuous rolling device is located between the extrusion device and the leveling device, and the curve of the roller surface tends to be gentle in turn. The invention adopts continuous extrusion, plate rolling, leveling or continuous extrusion, plate rolling, rolling and leveling and rolling process, so that the magnesium alloy ultra-thin plate is continuously deformed and formed at one time, the surface of the plate is smooth, and the internal structure is dense.

Description

Continuous extrusion device and extrusion method for wide-width magnesium alloy ultra-thin plates

technical field

The invention belongs to the field of plastic processing of metal materials and non-ferrous metals, and relates to a device capable of forming a wide-width magnesium alloy ultra-thin plate through extrusion, plate rolling or continuous rolling at one time, and also relates to an extrusion method using the device.

Background technique

High-performance structural materials are an important material basis for transportation, energy and power, resources and environment, electronic information, agriculture and construction, aerospace and national major projects, and are currently one of the most competitive high-tech new materials in the world. . Magnesium is currently the lightest metal among the most widely used structural metal materials. It not only has light weight, high specific strength and specific stiffness, good damping and vibration reduction, strong electromagnetic shielding, but also strong machinability and recyclability. Known as the "green" engineering material of the 21st century. Therefore, magnesium and magnesium alloys are the light metals with the most development potential at present, and they are the best substitute materials for aluminum alloys and plastic materials or expensive carbon fiber composite materials. They are more and more widely used in automobiles, aerospace, military industry and portable electronic products. It is getting more and more attention from engineers and technicians. In recent years, the annual growth rate of magnesium alloys in the world is as high as 20%, showing great application prospects, and the application of magnesium and its alloy materials has become an irreversible trend.

At present, the most potential development in the civilian application field of magnesium alloy is the application in portable electronic products and automobiles. It is estimated that the global demand for mobile phones, MP3, MP4 and notebook computers exceeds 1 million per week. Magnesium alloys can not only reduce the weight of mobile products, but more importantly, magnesium alloy shells can achieve the best radio waves. Effective shielding is incomparable to the currently used plastic, aluminum alloy, stainless steel and carbon fiber composite materials. With the global energy shortage and environmental protection requirements, the lightweight of automobiles has become an inevitable trend in the development of the automobile industry worldwide. The role of magnesium alloys in automobile weight reduction, performance improvement and environmental protection has been increasingly valued. In recent years, developed countries and regions such as the United States, Germany, Japan, Israel, and Australia have increased investment in the development and application of magnesium alloys, and have successively implemented research programs on magnesium alloys, aiming at the research and development of magnesium alloy products. plan.

However, since magnesium has a hcp close-packed hexagonal crystal structure with few slip systems, it is difficult to plastically work and form magnesium alloys at room temperature. At present, more than 90% of magnesium alloy parts adopt die-casting and semi-solid extrusion forming technology. Most of the magnesium alloys processed by these methods have poor mechanical properties at room temperature and high temperature, and low elongation at room temperature. They cannot meet room temperature or medium temperature like steel plates or aluminum plates. Plastic forming methods such as extrusion, stamping, forging, rolling, etc., make it subject to certain restrictions in application.

At present, only AZ series or ZK series deformed magnesium alloy sheets with a thickness of 2 mm or more can be produced by hot rolling or extrusion. Defects such as cracks often appear on the edges and surfaces of magnesium alloy sheets, and the appearance quality is not good. In addition, due to the poor plastic deformation ability of magnesium alloy, cracks are prone to appear inside the plate during warm and hot rolling and leveling. Usually this kind of magnesium alloy sheet is not suitable for subsequent deformation processing at room temperature. For example [Feng Kang, Zhao Hongyang "Thermal Processing Technology" 2007, (36) 8:5-8 "The homogeneous annealing process of twin-roll casting and rolling AZ31B magnesium alloy sheet"] using twin-roll casting and rolling can only cast and roll 2-3mm Thick wrought magnesium alloy AZ31B sheet. Literature [Zhang Qinglai, Wang Lili, Zhang Shihong, Dai Qixun, Wang Zhongtang "Metal Heat Treatment" 2006, (31) 9:5-9 "Preparation of AZ31 Magnesium Alloy Sheet and Research on Its Microstructure and Properties"] Magnesium alloy rods were obtained by semi-continuous casting The material is refined through high-ratio extrusion to prepare thin plates of various thicknesses, and fine-grained magnesium alloy thin plates with an average grain size of <5um are obtained through unidirectional and cross rolling. Although thin plates with a thickness of 0.7 mm can be obtained, due to the limited extrusion pressure during hot extrusion, long thin plates cannot be produced, and the width of the thin plates is also greatly restricted, and large-width thin plates cannot be produced. The patent [ZL200810030665.1, Forming method of magnesium alloy ultra-thin plate] discloses a forming method that can prepare 0.1×500×500 (mm), but it must go through the operation of horizontal rolling-longitudinal rolling, then horizontal rolling and then longitudinal rolling, and Supplemented by intermediate annealing to eliminate work hardening, only 1mm thick plates can be prepared in the end, and then it needs to go through multiple cold rolling and intermediate annealing processes with a deformation of only 5%. Although a plate of 0.1×500×500 (mm) can be obtained, the process is complicated, the molding is difficult, and the cost is high.

It can be seen that the preparation of thin-plate magnesium alloys with a thickness of less than 2 mm, especially plates with a thickness of less than 1 mm, is even more difficult, which limits the application in the field of portable electronic products that require relatively low strength performance indicators and high formability requirements, and also limits Applications in transportation, communications and defense industries. However, there is an urgent need for magnesium alloy thin plates with a thickness of less than 1mm in production. After plastic processing such as cold stamping, they can be used to manufacture 3C product shells after surface treatment or compound PVC, so as to give full play to the most effective electromagnetic shielding and light weight of magnesium alloys. quantification.

Based on the above and data retrieval, there is no report on the device and process method for forming wide-width magnesium alloy ultra-thin plates by extrusion, rolling or continuous rolling.

Contents of the invention

The purpose of the present invention is to provide a continuous extrusion and rolling device for wide-width magnesium alloy ultra-thin plates to solve the problem that the existing magnesium alloy materials have poor room temperature plasticity and cannot be directly formed by cold deformation. The present invention is prepared by continuous extrusion plastic deformation Low-cost, wide-width ultra-thin magnesium alloy sheet with low extrusion cost and high efficiency.

Another object of the present invention is to provide an extrusion method of the above-mentioned apparatus.

The technical solution adopted in the present invention is: a continuous extrusion device for wide-width magnesium alloy ultra-thin plates, including an extrusion device, a continuous plate rolling device and a leveling device; the extrusion device includes an extrusion barrel and an extrusion barrel The "W"-shaped extrusion die at the bottom, the inner wall of the extrusion barrel and the "W"-shaped extrusion die form a mold cavity, and a "W" gap is set on the "W"-shaped extrusion die; the extrusion barrel There is also a heating device on the top; the continuous rolling device is composed of multiple sets of rolling conveying rollers, each set of rolling conveying rollers is composed of an upper rolling roller and a lower rolling roller, and the upper rolling roller is provided with a "W" shaped convex From the beginning, the lower rolling plate roller is provided with a "W"-shaped groove corresponding to the "W"-shaped convex shape; the leveling device is composed of multiple sets of leveling rolls, each set of leveling rolls consists of an upper leveling roll and a lower leveling Composition, the upper leveling roller and the lower leveling roller are cylindrical; the continuous rolling device is located between the extrusion device and the leveling device, and the multiple sets of rolling transfer rollers from the extrusion device to the leveling device, the rolling The "W"-shaped opening angle of the "W"-shaped protrusions and "W"-shaped grooves on the conveying roller increases sequentially, and the curve of the roller surface tends to be gentle in turn; The surface curve is consistent with the curve of the "W" gap of the "W" extrusion die.

Among them, the "W" type gap is composed of flaring, extrusion seam and discharge port arranged in sequence from top to bottom, and the three are connected; the opening angle θ of the flaring is 60°~90°, and the extrusion seam The width b of the extrusion slit is 0.5-2 mm, the height h of the extrusion slit is 1-2 times the width b of the extrusion slit, and the width B of the discharge port is 2-3 times the width b of the extrusion slit.

Wherein, the heating device provided on the outer wall of the extrusion barrel is a resistance heating body, and a thermocouple A is arranged on the wall of the extrusion barrel; a thermocouple B is arranged on the "W" type extrusion die.

Among them, the gap between the upper roller and the lower roller of the rolling conveyor roller is at least 0.05mm; the gap between the upper roller and the lower roller of the leveling roller is at least 0.05mm.

Another technical solution adopted in the present invention is, utilize the above-mentioned continuous rolling device to carry out the method for the continuous rolling of wide-width magnesium alloy ultra-thin plates:

(1) Use a heating device to heat the extrusion barrel and the "W"-shaped extrusion die, so that the extrusion temperature in the mold cavity reaches 150 ° C ~ 350 ° C;

At the same time, preheat the magnesium alloy billet to be extruded to 150°C~350°C, and then put it into the mold cavity composed of the inner wall of the extrusion barrel and the "W"-shaped extrusion die;

(2) Keep the extrusion temperature at 150°C~350°C, start the press, and the press extrudes the magnesium alloy billet through the extrusion rod, so that the extruded magnesium alloy billet passes through the "W"-shaped extrusion die The "W" gap is extruded into a "W"-shaped magnesium alloy sheet strip with a "W"-shaped cross-section;

(3) Preheat each set of rolling transfer rollers to 150°C~350°C, and then transfer the "W"-shaped magnesium alloy sheet strip to the continuous rolling device, and pass through multiple sets of rolling transfer roller pairs "W" in turn. "Type magnesium alloy thin plate and strip are clamped for rolling treatment;

(4) Preheat each set of leveling rollers to 150°C~350°C, and then transfer the rolled "W"-shaped magnesium alloy sheet strip to the leveling device, and pass through multiple sets of leveling rollers in turn. "W" type magnesium alloy thin plate and strip are rolled for leveling treatment;

The "W"-shaped magnesium alloy sheet strip is rolled and leveled by multiple sets of rolling transfer rollers and multiple sets of leveling rollers to become a magnesium alloy flat sheet.

Among them, the continuous rolling device is composed of three sets of rolling transfer rollers, and the leveling device is composed of two sets of leveling rollers.

In the above step (3), when the three sets of rolling and conveying rollers clamp the "W"-shaped magnesium alloy thin plate strip, the surface speed of the first set of rolling and conveying rollers close to the extrusion device is faster than that of the "W"-shaped magnesium alloy. The extrusion line speed of the sheet strip is 1-10% faster; the line speed of the second set of rolling conveyor rollers located in the middle is 1-5% faster than the line speed of the "W" type magnesium alloy sheet strip; close to the leveling The surface line speed of the third set of plate rolling conveying rollers in the device is 1-5% faster than that of the "W" type magnesium alloy sheet strip.

In the above step (4), when the two sets of leveling rollers are rolling the "W" type magnesium alloy sheet strip, the surface speed of the first set of leveling rollers close to the continuous rolling device is faster than that of the "W" type magnesium alloy sheet strip. The surface speed of the second set of leveling rollers is 1-5% faster than that of the first set of leveling rollers.

It is further characterized in that, in step (3), when the second group of rolling transfer rollers and the third group of rolling transfer rollers are rolling the "W"-shaped magnesium alloy thin plate strip, the upper rolling plate is adjusted by the driving device The gap between the roll and the lower rolling roll is used to compress the "W" type magnesium alloy sheet and strip while rolling the "W" type magnesium alloy sheet strip, and the rolling deformation is controlled at 10-30%; steps In (4), the first group of leveling rollers close to the continuous rolling device flattens the "W"-shaped magnesium alloy thin plate and strip, and then rolls the "W"-shaped magnesium alloy thin plate into a magnesium alloy flat plate Plate, when the second set of leveling rollers level the magnesium alloy flat plate, the gap between the upper leveling roller and the lower leveling roller is adjusted by the driving device to compress the magnesium alloy flat plate while the magnesium alloy flat plate is Rolling, rolling deformation is controlled at 10-30%.

It is further characterized in that the flat magnesium alloy sheet after the leveling treatment in step (4) is rolled into a thinner sheet by rolling with one or more sets of rolls.

The beneficial effect of the present invention is that, by adopting the "W" type extrusion die, the extruded material can obtain a wide sheet in a limited extrusion section through the "W" gap, which reduces the impact on the equipment of the conventional extrusion wide sheet. requirements, and simplifies the extrusion process to reduce production costs. The extruded "W"-shaped sheet can be rolled by multiple rolling rollers and leveled by multiple sets of leveling rollers to obtain a wide and straight super The thin plate solves the problem that the wide-width plate cannot be prepared by extrusion; the magnesium alloy flat plate with a thickness of 0.05mm-2mm can be prepared by using the extrusion device and the extrusion method provided by the invention, and the magnesium alloy prepared by the invention Alloy flat sheet can be used for re-rolling and cold deformation processing at room temperature, such as stamping, forging and other direct forming processing, which has a wide range of applications and can be directly applied to the preparation of advanced 3C product shells, and can also be used in automobiles, aviation, etc. In industries such as aerospace, it can save energy and reduce production costs; in addition, the magnesium alloy flat ultra-thin plate prepared by the present invention can be used after plastic processing such as cold, warm, hot stamping, etc. Manufacture the shell of 3C products, and give full play to the most effective electromagnetic shielding and lightweight effect of magnesium alloy.

Description of drawings

Fig. 1 is the structural representation of extrusion device in extrusion device of the present invention;

Fig. 2 is the structural representation of " W " type extrusion die in the extrusion device of the present invention;

Fig. 3 is the A-A sectional view of Fig. 2;

Fig. 4 is a structural schematic diagram of the first set of rolling conveying rollers in the continuous rolling device of the present invention;

Fig. 5 is a schematic structural view of the second group of plate rolling conveying rollers in the continuous plate rolling device of the present invention;

Fig. 6 is a structural schematic diagram of the third group of rolling conveying rollers in the continuous rolling device of the present invention;

Fig. 7 is a schematic structural view of leveling rollers in the leveling device of the present invention;

Fig. 8 is a structural schematic diagram of continuous extrusion and rolling of magnesium alloy plates by the extrusion rolling device of the present invention.

In the figure, 1. extrusion rod, 2. extrusion barrel, 3. resistance heating body, 4. thermocouple A, 5. "W" type extrusion die, 6. thermocouple B, 7. "W" type Magnesium alloy thin plate and strip, 8. Magnesium alloy billet, 9. "W" gap, 10. Flaring, 11. Extrusion gap, 12. Discharge port, 13. Upper roller, 14. Lower roller , 15. "W"-shaped protrusion, 16. "W"-shaped groove, 17. Upper leveling roller, 18. Lower leveling roller, 19. Magnesium alloy flat sheet, 20. Magnesium alloy flat sheet.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The invention provides a continuous extrusion and rolling device for ultra-thin wide-width magnesium alloy plates, which includes an extrusion device, a continuous rolling device and a leveling device, and the continuous rolling device is located between the extrusion device and the leveling device.

As shown in Figure 1, the extrusion device includes an extrusion barrel 2 and a "W"-shaped extrusion die 5 arranged at the bottom of the extrusion barrel 2, and the inner wall of the extrusion barrel 2 and the "W"-shaped extrusion die 5 constitute a die The die cavity is used to place the magnesium alloy billet 8 to be extruded. As shown in Figure 2, a "W" type gap 9 is provided on the "W" type extrusion die 5, and as shown in Figure 3, the "W" type gap 9 is composed of flared mouth 10, extrusion The pressure seam 11 and the discharge port 12 are composed, and the three are connected; the opening angle θ of the flared mouth 10 is 60°-90°, the width b of the extrusion seam 11 is 0.5-2 mm, and the height h of the extrusion seam 11 is 1 to 2 times the width b of the extrusion slit 11, and the width B of the discharge port 12 is 2 to 3 times the width b of the extrusion slit 11; Die 5, just can extrude the sheet material of different thickness. The outer wall of the extrusion barrel 2 is provided with a resistance heating body 3, and the resistance heating body 3 is energized and heated, so that the extrusion temperature of the mold cavity of the extrusion device reaches 450°C from room temperature to meet the requirements of hot extrusion. The thermocouple A4 is inserted into the wall of the extrusion barrel 2, and the thermocouple A4 and the temperature control device of the resistance heating body 3 form a control circuit, which is used to monitor and control the extrusion barrel 2 and the "W"-shaped extrusion die during the extrusion process. 5 temperature change; "W" type extrusion die 5 is inserted into the thermocouple B6 for monitoring and controlling the temperature change at the "W" type gap 9 during the extrusion process.

The continuous rolling device is composed of multiple sets of rolling conveying rollers, each set of rolling conveying rollers consists of an upper rolling roller 13 and a lower rolling roller 14, the upper rolling roller 13 is provided with a "W"-shaped protrusion 15, and the lower rolling roller The rolling roller 14 is provided with a "W"-shaped groove 16 corresponding to the shape of the "W"-shaped protrusion 15 . The lower platen roller 14 is fixed, and the roll surface can only rotate synchronously with the upper platen roller 13 and cannot move up and down. The upper platen roller 13 is mechanically driven by hydraulic pressure or screw nuts, so that not only the roll surface can rotate, but also can move up and down. To adjust the gap between the upper and lower rollers to compress the magnesium alloy plate and strip, the minimum gap is 0.05mm. Taking the continuous rolling device consisting of three sets of rolling transfer rollers as an example, as shown in Figure 4, the roll surface curve of the first group of rolling transfer rollers close to the extrusion device is consistent with the "W"-shaped extrusion die 5 " The curve of the W" gap 9 is consistent. As shown in Figure 5, the roll surface curve of the second set of rolling transfer rollers is gentler than that of the first set of rolling transfer rollers, that is to say, the "W"-shaped protrusions 15 and The opening angle of the "W" type groove 16 is larger than the opening angle of the "W" type protrusion 15 and the "W" type groove 16 of the first group of rolling plate transfer rollers; The roller surface curve of the third group of rolling plate transfer rollers of the flat device is gentler than that of the second group of rolling plate transfer rollers, that is to say, the "W"-shaped protrusions 15 and "W" of the third group of rolling plate transfer rollers The opening angle of the shaped groove 16 is larger than the opening angle of the "W" shaped protrusion 15 and the "W" shaped groove 16 of the second group of rolling plate transfer rollers.

As shown in Figure 7, the leveling device is composed of multiple sets of leveling rollers, each set of leveling rollers includes an upper leveling roller 17 and a lower leveling roller 18, both of which are cylindrical, and the rollers The surface is a flat roller. The lower leveling roller 18 is fixed, and the roller surface can only rotate synchronously with the upper leveling roller 17 and cannot move up and down. The upper leveling roller 17 is mechanically driven by hydraulic pressure or screw nuts. Not only the roller surface can rotate, but also can move up and down for adjusting up and down. The gap between the rollers is used to compress the magnesium alloy plate and strip, and the minimum gap is 0.05mm.

As shown in Figure 8, take the continuous rolling device of the present invention which consists of three groups of rolling transfer rollers and the leveling device consists of two groups of leveling rollers as an example. The method of continuous extrusion of thin plate, its specific operation steps are as follows:

(1) The extrusion barrel 2 and the "W"-shaped extrusion die 5 are heated by the resistance heating body 3 arranged on the outer wall of the extrusion barrel 2, so that the extrusion temperature in the mold cavity reaches 150°C~350°C;

At the same time, the magnesium alloy billet 8 to be extruded is kept at 150° C. to 350° C. for 2 to 24 hours for homogenization heat treatment, and then processed to remove the alloy ingot scale, and cut into segments to be extruded; The magnesium alloy billet 8 is quickly loaded into the mold cavity formed by the inner wall of the extrusion barrel 2 and the W-shaped extrusion die 5 .

(2) Keep the extrusion temperature at 150°C~350°C, start the press, and the press presses the magnesium alloy billet 8 downward through the extrusion rod 1, so that the magnesium alloy billet 8 passes through the "W"-shaped extrusion die The "W" gap 9 in the middle of 5 is extruded into a "W"-shaped magnesium alloy sheet strip 7 with a "W"-shaped cross-section; the specific extrusion process is: the magnesium alloy billet 8 is extruded through the flaring 10 Into the extrusion slit 11, the thickness of the "W" type magnesium alloy thin plate strip 7 after extrusion is limited by the width b of the extrusion slit 11, so by changing the size of the extrusion slit 11 width b, the after extrusion can be changed. The thickness of the sheet. Since the width B of the outlet 12 is wider than the width b of the extrusion slit 11 , the extruded “W”-shaped magnesium alloy thin plate strip 7 is discharged through the outlet 12 .

(3) Open the first set of rolling conveying rollers, and quickly guide the extruded "W"-shaped magnesium alloy sheet strip 7 into the first set of rolling conveying that is preheated to 150°C~350°C by resistance or flame Between the upper rolling roller 13 and the lower rolling roller 14 of the roller, then press the upper rolling roller 13, so that the first group of rolling conveying rollers clamp the "W" type magnesium alloy thin plate strip 7, and the first group of rolling The surface line speed of the plate delivery roller is 1-10% faster than the extrusion line speed of the "W" type magnesium alloy thin plate strip 7, and its purpose is to straighten the "W" type magnesium alloy thin plate strip 7. The first group of plate rolling transfer rollers does not play the role of unfolding the magnesium alloy plate, but is only used for positioning and straightening.

(4) Open the second set of rolling transfer rollers, and quickly introduce the "W"-shaped magnesium alloy thin plate strip 7 that has been straightened by the first set of rolling transfer rollers. Use resistance or flame to preheat to 150 ° C ~ 350 ° C between the upper rolling roller 13 and the lower rolling roller 14 of the second set of rolling transfer rollers, and then press down the upper rolling roller 13 so that the second set of rolling transfer rollers clamp the "W"-shaped magnesium alloy sheet strip Material 7. Since the upper rolling roller 13 and the lower rolling roller 14 of the second set of rolling rollers are gentler than the first set of rolling rollers, their "W"-shaped protrusions 15 and "W"-shaped grooves 16 The opening angle is larger, so the "W"-shaped magnesium alloy strip 7 becomes gentle after passing through the second set of plate rolling conveying rollers, and the width of the plate is widened. The roll surface line speed of the second group of rolling plate transfer rollers is 1-5% faster than the line speed of the "W" type magnesium alloy thin plate strip 7, and its purpose is to straighten the "W" type magnesium alloy thin plate strip 7.

Of course, it is also possible to adjust the gap between the upper and lower rolls so that the gap between the upper and lower rolls of the second set of rolling plate transfer rollers is smaller than the gap between the upper and lower rolls of the first set of rolling plate transfer rolls, but the gap is not less than 0.05mm. It is ensured that the second group of plate-rolling transfer rollers is rolled while pressing the "W"-shaped magnesium alloy strip 7, and the rolling deformation is controlled at 10-30%.

(5) Open the third set of rolling transfer rollers, and quickly introduce the "W"-shaped magnesium alloy sheet strip 7 that has been straightened by the second set of rolling transfer rollers. Preheat to 150°C~350°C with resistance or flame between the upper rolling roller 13 and the lower rolling roller 14 of the third set of rolling transfer rollers, and then press down the upper rolling roller 13, so that the third set of rolling transfer rollers clamp the "W"-shaped magnesium alloy sheet strip Material 7. Since the upper rolling roller 13 and the lower rolling roller 14 of the third group of rolling rollers are more gentle than the second group of rolling rollers, their "W"-shaped protrusions 15 and "W"-shaped grooves 16 The opening angle is larger, so the "W"-shaped magnesium alloy strip 7 becomes gentle after passing through the third set of W-shaped plate rolling conveying rollers, and the width of the plate widens again. The roll surface line speed of the third group of rolling plate transfer rollers is 1-5% faster than the line speed of the "W" type magnesium alloy thin plate strip 7, and its purpose is to straighten the W type magnesium alloy thin plate strip 7.

Of course, it is also possible to adjust the gap between the upper and lower rollers so that the gap between the upper and lower rollers of the third group of rolling plate transfer rollers is smaller than the gap between the upper and lower rollers of the first group of rolling plate transfer rollers, but the gap is not less than 0.05mm. Make sure that the third group of plate-rolling transfer rollers is rolling the "W"-shaped magnesium alloy strip 7 while pressing it, and the rolling deformation is controlled at 10-30%.

(6) Open the first set of leveling rollers, and quickly introduce the "W"-shaped magnesium alloy sheet strip 7 straightened by the third set of rolling and conveying rollers into the machine that is preheated to 150°C~350°C with resistance or flame. Between the upper leveling roll 17 and the lower leveling roll 18 of the first group of leveling rolls, the upper leveling roll 17 is pressed down, so that the first set of leveling rolls clamps the "W" type magnesium alloy sheet strip 7. Since the upper leveling roll 17 and the lower leveling roll 18 of the first set of leveling rolls are straight, the width of the plate that becomes gentle after the "W" type magnesium alloy strip 7 passes through three sets of rolling and conveying rolls is again Widen, from "W" type leveling to a flat plate, become a magnesium alloy flat plate 19. The roll surface line speed of the first group of leveling rollers is 1-5% faster than the line speed of the "W" type magnesium alloy thin plate strip 7, and its purpose is to straighten the "W" type magnesium alloy thin plate strip 7.

(7) Open the second set of leveling rollers, and quickly introduce the magnesium alloy flat sheet 19 that has been rolled and straightened by the first set of leveling rollers into the second set of leveling rollers that are preheated to 150°C to 350°C by resistance or flame. Between the upper leveling roller 17 and the lower leveling roller 18 of the leveling roller, then press down the upper leveling roller 17, so that the second group of leveling rollers clamps the magnesium alloy plate 19 leveled by the first group of leveling rollers. Since the upper leveling roll 17 and the lower leveling roll 18 of the second set of leveling rolls and the first set of leveling rolls are straight, the "W" type magnesium alloy strip 7 is formed by "W" after passing through the two sets of leveling rolls. "Type leveling becomes flat. The main function of the second group of leveling rollers is to further level and finish the magnesium alloy flat sheet 19 rolled and straightened by the first group of leveling rollers, so that the leveled magnesium alloy sheet is more smooth and becomes a magnesium alloy flat sheet. Sheet 20. The surface speed of the second group of leveling rollers is 1-5% faster than that of the first group of leveling rollers, the purpose of which is to further straighten the leveled magnesium alloy plate 19 . At the same time, by adjusting the gap between the upper and lower rollers, the gap between the upper and lower rollers of the second set of leveling rollers is smaller than the gap between the upper and lower rollers of the first set of leveling rollers, but the gap is not less than 0.05mm. That is to ensure that the second set of leveling rollers is used to compress the magnesium alloy flat plate 19, and at the same time it is continuously rolled and finished, so that the thickness of the magnesium alloy wide plate is uniform and straight, and the rolling deformation is controlled at 10-30%. .

The "W" type magnesium alloy thin plate strip 7 becomes a magnesium alloy flat plate 20 after being rolled by three sets of rolling conveying rollers and leveled and finished by two sets of leveling rollers. After two sets of leveling rollers, it can also be set One or more sets of rolls can roll the magnesium alloy flat sheet 20 into a thinner sheet. After the magnesium alloy sheet is prepared, it can be cut to length or directly coiled according to needs, so as to realize flat supply or Supplied in rolls.

In the above process, the upper rollers of the second group and the third group of rolling conveying rollers and the second group of leveling rollers can be pressed down a certain amount, and continuous rolling is carried out while continuous rolling and leveling are carried out to realize continuous extrusion. Pressing, continuous rolling, continuous leveling and continuous rolling. Three sets of W-shaped plate rolling transfer rollers and two sets of leveling rollers are preheated to 150°C~350°C by resistance or flame, so as to facilitate the rolling and leveling of materials without cracking. the

The flat magnesium alloy wide-width ultra-thin plate and strip prepared by the device and method provided by the present invention has a thickness of 0.05-2 mm and a width of ≥600 mm. At room temperature, the tensile strength σ _b is 200-260 MPa , Yield strength σ _0.2 : 190~240MPa, elongation δ≥20%, density ≤2.2g/cm ³ , meeting the needs of cold working of deformed structural parts at room temperature.

The present invention has a compact and reasonable structure and novel ideas. Due to the continuous extrusion, plate rolling, leveling or continuous extrusion, plate rolling, rolling and leveling and rolling processes, the ultra-thin magnesium alloy plate can be continuously deformed and formed at one time. , to achieve one-time molding of magnesium alloy ultra-thin sheet through extrusion and other processes, the surface of the sheet is smooth, the internal structure is dense, due to continuous deformation and recrystallization, the difference in organizational anisotropy is small, and the whole system is safe to use, easy to operate, and high in production efficiency .

Claims (10)

1. A continuous extrusion and rolling device for wide-width magnesium alloy ultra-thin plates, characterized in that: it includes an extrusion device, a continuous rolling device and a leveling device; the extrusion device includes an extrusion barrel (2) and is arranged on an extrusion The "W"-shaped extrusion die (5) at the bottom of the pressure barrel (2), the inner wall of the extrusion barrel (2) and the "W"-shaped extrusion die (5) constitute the mold cavity, and the "W"-shaped extrusion The die (5) is provided with a "W" type gap (9); the extrusion barrel (2) is also provided with a heating device; the continuous plate rolling device is composed of multiple sets of plate rolling transfer rollers, The roller is composed of an upper rolling roller (13) and a lower rolling roller (14). The upper rolling roller (13) is provided with a "W"-shaped protrusion (15), and the lower rolling roller (14) is provided with a The "W"-shaped groove (16) corresponding to the shape of the "W"-shaped protrusion (15); the leveling device is composed of multiple sets of leveling rollers, and each set of leveling rollers consists of an upper leveling roller (17) Roller (18), the upper leveling roller (17) and the lower leveling roller (18) are cylindrical; the continuous plate rolling device is located between the extrusion device and the leveling device, from the extrusion device to the leveling device The "W"-shaped opening angles of the "W"-shaped protrusions (15) and "W"-shaped grooves (16) on the rolling-plate conveying rollers increase sequentially, and the curves of the roller surfaces successively increase. Tends to gentle; the roll surface curve of the first group of rolling plate transfer rollers close to the extrusion device is consistent with the curve of the "W" gap (9) of the "W" type extrusion die (5). 2. The continuous extrusion device according to claim 1, characterized in that: the "W" type gap (9) consists of a flare (10), an extrusion slit (11) and an exit The opening (12) is composed of the three, and the three are connected; the opening angle θ of the flaring (10) is 60°-90°, the width b of the extrusion seam (11) is 0.5-2 mm, and the extrusion seam (11) ) is 1 to 2 times the width b of the extrusion slit (11), and the width B of the outlet (12) is 2 to 3 times the width b of the extrusion slit (11). 3. The continuous extrusion device according to claim 1, characterized in that: the heating device provided on the outer wall of the extrusion barrel (2) is a resistance heating body (3), and a thermocouple is arranged on the wall of the extrusion barrel (2) A (4); a thermocouple B (6) is arranged in the "W" type extrusion die (5). 4. The continuous extrusion device according to claim 1, characterized in that: the gap between the upper rolling roller (13) and the lower rolling roller (14) of the rolling conveying roller is at least 0.05 mm; The gap between the upper leveling roll (17) and the lower leveling roll (18) of the leveling rolls is at least 0.05mm. 5. A method utilizing the continuous extrusion device of claim 1 to carry out continuous extrusion of wide-width magnesium alloy ultra-thin plates, characterized in that: The structure of the continuous extrusion device is: including an extrusion device, a continuous rolling device and a leveling device; the extrusion device includes an extrusion barrel (2) and a "W" shaped The extrusion die (5), the inner wall of the extrusion barrel (2) and the "W"-shaped extrusion die (5) constitute the mold cavity, and the "W"-shaped extrusion die (5) is provided with a "W" Gap (9); a heating device is also provided on the extruding barrel (2); the continuous plate rolling device is composed of multiple sets of plate rolling conveying rollers, and each set of plate rolling conveying rollers consists of an upper rolling plate roller (13) and a lower plate rolling roller Composed of rolling rollers (14), the upper rolling roller (13) is provided with a "W"-shaped protrusion (15), and the lower rolling roller (13) is provided with a corresponding "W"-shaped protrusion (15). The "W"-shaped groove (16); the leveling device is composed of multiple sets of leveling rollers, each set of leveling rollers is composed of an upper leveling roller (17) and a lower leveling roller (18), and the upper leveling roller (17 ) and the lower leveling roller (18) are cylindrical; the continuous plate rolling device is located between the extrusion device and the leveling device, and the multiple sets of rolling plate transfer rollers between the extrusion device and the leveling device, the rolling The "W"-shaped opening angle of the "W"-shaped protrusion (15) and "W"-shaped groove (16) on the plate conveying roller increases sequentially, and the curve of the roll surface tends to be gentle in turn; the first one close to the extrusion device The roll surface curve of the rolling plate transfer roller is consistent with the curve of the "W" gap (9) of the "W" extrusion die (5); Utilize above-mentioned device, carry out the method for continuous extrusion of wide width magnesium alloy ultra-thin sheet material is, (1) Use a heating device to heat the extrusion barrel (2) and the "W"-shaped extrusion die (5), so that the extrusion temperature in the mold cavity reaches 150°C~350°C; At the same time, preheat the magnesium alloy blank (8) to be extruded to 150°C~350°C, and then put it into the mold cavity composed of the inner wall of the extrusion barrel (2) and the "W"-shaped extrusion die (5) Inside; (2) Keep the extrusion temperature at 150°C~350°C, start the press, and the press extrudes the magnesium alloy billet (8) through the extrusion rod (1), so that the extruded magnesium alloy billet (8) passes through The "W"-shaped gap (9) on the "W"-shaped extrusion die (5) is extruded into a "W"-shaped magnesium alloy sheet strip (7) with a "W"-shaped cross-section; (3) Preheat each set of rolling transfer rollers to 150°C~350°C, and then transfer the "W"-shaped magnesium alloy thin plate strip (7) to the continuous rolling device, and pass through multiple sets of rolling transfer rollers in turn Clamp the "W" type magnesium alloy thin plate strip (7) and perform rolling treatment; (4) Preheat each set of leveling rollers to 150°C~350°C, and then transfer the rolled "W"-shaped magnesium alloy sheet strip (7) to the leveling device, and pass through multiple sets of leveling rollers in turn. The flat roller flattens the "W" type magnesium alloy thin plate (7) for leveling treatment; The "W"-shaped magnesium alloy sheet strip (7) becomes a magnesium alloy flat sheet (20) after being rolled and leveled by multiple sets of rolling transfer rollers and multiple sets of leveling rollers. 6. The method for continuous extrusion and rolling of magnesium alloy ultra-thin plates according to claim 5, characterized in that: the continuous plate rolling device is composed of three sets of plate rolling conveying rollers, and the leveling device is composed of two sets of leveling rollers. 7. The method for continuous extrusion of magnesium alloy ultra-thin plates according to claim 6, characterized in that: in the step (3), three sets of plate-rolling and conveying rollers pair the "W"-shaped magnesium alloy thin plates and strips (7) When clamping, the surface speed of the first group of rollers near the extrusion device is 1-10% faster than that of the "W" type magnesium alloy sheet strip (7); the second group located in the middle The surface speed of the rolling conveying roller is 1-5% faster than that of the "W" type magnesium alloy thin plate strip (7); The line speed of the type magnesium alloy sheet strip (7) is 1-5% faster. 8. The continuous extrusion method for magnesium alloy ultra-thin plates according to claim 6, characterized in that: in the step (4), two sets of leveling rollers roll the "W" type magnesium alloy thin plates (7) Normally, the surface speed of the first group of leveling rollers close to the continuous rolling device is 1-5% faster than that of the "W" type magnesium alloy sheet (7), and the surface speed of the second group of leveling rollers Compared with the first group of leveling rollers, the surface line speed is 1-5% faster. 9. The method for continuous extrusion of magnesium alloy ultra-thin plates according to claim 6, characterized in that: in the step (3), in the second set of plate-rolling transfer rollers and the third set of plate-rolling transfer roller pairs "W When the "type magnesium alloy thin plate strip (7) is rolled, the gap between the upper rolling roll (13) and the lower rolling roll (14) is adjusted by the driving device to compress the "W" type magnesium alloy thin plate strip. Roll the "W" type magnesium alloy thin plate strip (7) at the same time as the material (7), and the rolling deformation is controlled at 10-30%; in the step (4), the first Set of leveling rollers to flatten the "W" type magnesium alloy thin plate (7) for leveling treatment, and then roll the "W" type magnesium alloy thin plate (7) into a magnesium alloy flat plate (19). When the two sets of leveling rollers level the magnesium alloy flat plate (19), adjust the gap between the upper leveling roller (17) and the lower leveling roller (18) through the driving device to compress the magnesium alloy flat plate (19) At the same time, the magnesium alloy flat plate (19) is rolled, and the rolling deformation is controlled at 10-30%. 10. The method for continuous extrusion of magnesium alloy ultra-thin plates according to claim 5, characterized in that: the magnesium alloy flat plate (20) after the leveling treatment in step (4) passes through one or more sets of rolls Rolled, rolled into thinner sheets.

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