A forming device and method for a centrifugal roller-impregnated CF / Al composite thin-walled tube

Abstract

The present invention relates to a device and method for forming a thin-walled tube made of CF / Al composite material by centrifugal roller infiltration. The device comprises a roller drum, a centrifugal drum, a first drive mechanism, an alloy smelting and conveying mechanism, a roller assembly, and a heating assembly. A preform is provided on the inner wall of the roller drum; the centrifugal drum is concentrically and rotatably disposed within the roller drum, and a plurality of sieve holes are provided on the drum wall of the centrifugal drum; the first drive mechanism is used to drive the centrifugal drum to rotate; the alloy smelting and conveying mechanism is used to feed material into the centrifugal drum; the roller assembly is disposed between the inner wall of the roller drum and the outer wall of the centrifugal drum and rotates synchronously with the centrifugal drum; and the heating assembly is used to heat the preform on the roller drum. This device improves the surface forming quality of thin-walled tubes made of composite material.

Description

Technical Field

[0001] The present invention relates to the technical field of forming thin-walled tubes (elastomers) of continuous carbon fiber reinforced metal matrix composite materials, and in particular to a forming device and method of a thin-walled tube (elastomer) of a centrifugal roller-impregnated carbon fiber reinforced aluminum matrix (CF / Al) composite material. Background Art

[0002] As advanced missile weapons develop toward lightweight, high-speed, stealth, and larger calibers, higher requirements are placed on advanced materials, process technology, and forming equipment. The performance of advanced missiles is primarily reflected in their charge, accuracy, and reliability. The missile body, a thin-walled structure, is a crucial component of advanced missiles, primarily responsible for forming the missile's shape, connecting and mounting various onboard subsystems, and withstanding various loads.

[0003] Currently, aluminum alloys and resin-based composites have been successfully applied to the design and manufacture of projectiles. However, aluminum alloys have high density and low strength. Glass fiber-reinforced resin-based composites have low strength and poor heat resistance under high-temperature conditions, requiring the installation of independent thermal insulation layers. For projectiles with a certain outer diameter, this results in a reduced charge, impacting overall performance. Furthermore, resin-based composites have drawbacks such as numerous process steps, low production capacity, difficulty ensuring stability in high-temperature environments, and susceptibility to aging.

[0004] Because CF / Al composite materials have the advantages of high temperature resistance, low density, high specific strength and specific stiffness, good fatigue and corrosion resistance, and strong impact resistance, their use in advanced missiles, especially in the manufacture of missile bodies, can effectively overcome problems such as low strength of aluminum alloys, easy aging and moisture absorption of resin-based composite materials, and difficulty in ensuring strength in high temperature environments.

[0005] However, the performance, application and cost of CF / Al composite thin-walled tubes (elastomers) depend largely on the material forming equipment and preparation method. Although existing centrifugal casting can be used to prepare metal and chopped fiber reinforced metal matrix composites, centrifugal casting is a manufacturing method in which liquid metal is injected into a high-speed rotating mold and centrifugal force is used to fill the mold and form a casting. Therefore, the liquid metal is brought into contact with the alloy through centrifugal action. However, the liquid metal will be unevenly distributed after splashing onto the alloy due to centrifugal force, resulting in poor surface quality of the thin-walled tube formed after the liquid metal penetrates into the alloy.

[0006] Therefore, it is necessary to provide a forming device and method for centrifugal roller-pressed infiltration of CF / Al composite material thin-walled tubes to solve the above problems. Summary of the Invention

[0007] The present invention provides a forming device and method for a thin-walled tube of centrifugal roller-impregnated CF / Al composite material. The device and method centrifuge the liquid material so that the liquid material is splashed onto a preheated preform, and then the liquid material on the preform is spread and rolled by a rolling assembly to solve the surface quality problem of existing thin-walled tube forming.

[0008] The present invention provides a centrifugal roller-impregnated CF / Al composite thin-walled tube forming device and method using the following technical solutions:

[0009] A roller-pressing cylinder, the inner wall of which is provided with a preform;

[0010] The centrifugal cylinder is concentrically and rotatably arranged in the roller cylinder, and a plurality of sieve holes are arranged on the cylinder wall of the centrifugal cylinder;

[0011] A first driving mechanism, which is used to drive the centrifugal cylinder to rotate;

[0012] An alloy smelting conveying mechanism, which is used to feed the interior of the centrifuge cylinder;

[0013] The roller pressing assembly is arranged between the inner wall of the roller pressing cylinder and the outer wall of the centrifugal cylinder. The roller pressing assembly rotates synchronously with the centrifugal cylinder and is used to spread and roll the screened liquid onto the preform when the liquid in the centrifugal cylinder is screened through the sieve holes.

[0014] and a heating assembly, which is used to heat the preform on the roller cylinder.

[0015] Preferably, the heating assembly comprises: an induction heating coil arranged around the outer circumference of the roller cylinder, and the induction heating coil is electrically connected to the induction heating controller.

[0016] Preferably, a rotating shaft is provided on each end surface of the centrifugal cylinder, and the rotating shaft is rotatably connected to the roller cylinder through a first bearing, and one of the rotating shafts is transmission-connected to the output end of the first driving mechanism after passing through the roller cylinder, and the other rotating shaft is a first hollow shaft, which is connected to the discharge port of the alloy smelting and conveying mechanism after passing through the roller cylinder.

[0017] Preferably, it also includes an installation box, the inner wall of the installation box is provided with thermal insulation material; the roller cylinder is rotatably arranged in the installation box through a second hollow shaft connected by the end face, and one of the second hollow shafts is connected to the outer ring of the first hollow shaft through a second bearing, and the extended end of the other second hollow shaft is connected to the second drive mechanism after passing through the installation box, and the second drive mechanism is used to drive the roller cylinder to rotate.

[0018] Preferably, a vacuuming component is further included, and the vacuuming component is used to vacuum the installation box.

[0019] Preferably, the alloy smelting and conveying mechanism includes a smelting furnace, the discharge port of the smelting furnace is connected to a rigid discharge pipe, the discharge pipe passes through the installation box and extends into the centrifugal cylinder through the first hollow shaft, and the smelting furnace is also connected to an argon gas bottle through a hose.

[0020] Preferably, the rolling assembly includes at least multiples of rolling rollers, and multiple groups of rolling rollers are evenly distributed around the center of the centrifugal cylinder. Each group of rolling rollers is connected to the end face of the centrifugal cylinder through a rolling roller bracket, and the diameter of half of the rolling rollers in each group of rolling rollers is larger than the diameter of the other half of the rolling rollers. The rolling rollers with small diameters are used to spread and pre-roll the screened liquid, and the rolling rollers with large diameters are used to roll the liquid again after spreading and pre-rolling.

[0021] Preferably, the rolling roller bracket includes a support plate, and two rolling roller mounting holes are provided on the end of the support plate away from the rotating shaft. The ends of the rolling rollers are rotatably connected to the mounting holes. An elongated groove is provided on the support plate along the length direction of the support plate, and a fastening screw is passed through the elongated groove of the support plate. The fastening screw is fixed to the end face of the centrifugal cylinder after passing through the elongated groove of the support plate; wherein the diameters of the two rolling rollers on each support plate are different.

[0022] Preferably, the first drive mechanism and the second drive mechanism have the same structure. The first drive mechanism includes a motor, and the output end of the motor is connected to the rotating shaft of the centrifugal cylinder and the second hollow shaft of the roller cylinder through a belt transmission assembly.

[0023] A method for forming a thin-walled tube of a CF / Al composite material by centrifugal roller pressing and infiltration, comprising:

[0024] Install the prefabricated body, put in the smelting material, and check the airtightness of the installation box and the smelting furnace;

[0025] Fill the melting furnace with protective gas and melt the materials;

[0026] The installation box is vacuumed and the centrifugal cylinder, roller pressing cylinder, preform and roller pressing assembly in the installation box are preheated;

[0027] When the temperature of the smelting furnace reaches 750-820℃ and the preheating temperature in the installation box is 680-720℃, the roller cylinder and the centrifugal cylinder are controlled to work and materials are fed to the centrifugal cylinder;

[0028] The liquid material that hits the surface of the preform after centrifugation is rolled for 5 to 8 minutes;

[0029] After the roller pressing is completed, increase the speed of the centrifuge drum and turn off the heating component;

[0030] When the preheating temperature in the box drops to 400°C, reduce the rotation speed of the roller cylinder and the centrifugal cylinder, and maintain the reduced speed for 15 to 20 minutes, turn off all equipment, and take out the CF / Al composite thin-walled cylinder.

[0031] The beneficial effects of the present invention are:

[0032] 1. By high-speed centrifuging the liquid entering the centrifuge cylinder, the liquid splashes from the sieve holes on the centrifuge cylinder onto the preform, thereby achieving initial penetration of the liquid into the preform. Then, while the centrifuge cylinder rotates at high speed, the rolling assembly rotates synchronously, thereby spreading and rolling the alloy liquid through the rolling assembly. During the spreading and rolling process, the alloy liquid evenly penetrates the preform, and the preform is heated by the heating assembly to ensure that there is no large temperature difference between the temperature of the liquid and the temperature of the preform when the liquid penetrates the preform. Therefore, while the alloy liquid is evenly dispersed and fully penetrates the preform, it is ensured that the liquid is fully integrated into the preform, thereby improving the surface forming quality of the thin-walled cylinder of the composite material.

[0033] 2. Since air is drawn in during the forming process of composite thin-walled tubes, the oxygen in the air will cause shrinkage holes to form inside the material, resulting in insufficient infiltration of the alloy liquid, which ultimately affects the mechanical properties of the material. Therefore, the present invention sets up an installation box and evacuates the installation box when preparing the composite thin-walled tube to avoid the oxidation of the alloy liquid and the problem of gas entrainment, thereby improving the infiltration quality of the alloy liquid into the preform and further ensuring the molding quality of the surface of the composite thin-walled tube.

[0034] 3. By loosening the fastening screws and then moving the support plate, the distance between the rolling roller at the end of the support plate and the preform on the inner wall of the rolling cylinder can be adjusted, and then the fastening screws pass through the oblong groove and connect with the threaded holes on the end cover of the centrifugal cylinder to limit the support plate, thereby realizing the preparation of thin-walled cylinders of different thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 Schematic diagram of the overall structure of an embodiment of a forming device for a centrifugal roller-impregnated CF / Al composite thin-walled tube according to the present invention;

[0037] Figure 2This is a schematic structural diagram of the internal components of an installation box of a forming device for centrifugal roller-pressed infiltration of CF / Al composite material thin-walled cylinders according to the present invention;

[0038] Figure 3 A cross-sectional view of the installation box and internal structure of a centrifugal roller-impregnated CF / Al composite thin-walled tube forming device of the present invention;

[0039] Figure 4 An exploded view of the internal structure of an installation box of a forming device for centrifugal roller-pressed infiltration of CF / Al composite thin-walled cylinders according to the present invention;

[0040] Figure 5 This is a schematic structural diagram of a centrifugal cylinder end cover, a rolling roller support, and a first hollow shaft of a forming device for a centrifugal roller-impregnated CF / Al composite thin-walled cylinder according to the present invention;

[0041] Figure 6 This is a state diagram of the rolling assembly during operation in the process of forming a composite thin-walled tube member using the forming device of the present invention;

[0042] In the figure: 101, argon gas cylinder; 102, hose; 103, melting furnace; 104, discharge pipe; 201, bearing end cover; 202, box cover; 203, installation box; 204, bearing end cover; 301, first belt; 302, first motor; 303, second motor; 304, second belt; 401, vacuum pump; 402, induction heating controller; 403, nano aerogel felt; 404, induction heating coil; 405, high temperature resistant Gasket; 406, stainless steel pipe; 407, pipe joint; 501, second bearing; 502, roller cylinder end cover; 503, pulley; 504, roller cylinder; 505, preform; 506, fixing ring; 601, rotating shaft; 601-1, first hollow shaft; 602, first bearing; 603, roller bracket; 604, large roller; 604-1, small roller; 605, centrifuge cylinder; 605-1, centrifuge cylinder end cover. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] An embodiment of a forming device and method of a centrifugal roller-impregnated CF / Al composite thin-walled tube of the present invention is as follows: Figure 3As shown, it includes: a roller cylinder 504, a centrifugal cylinder 605, a first driving mechanism, an alloy smelting and conveying mechanism, a roller assembly and a heating assembly. Specifically, the inner wall surface of the roller cylinder 504 is fixed with a preform 505 by a fixing ring 506; a centrifugal cylinder 605 is concentrically and rotatably arranged in the roller cylinder 504, and the centrifugal cylinder 605 is driven to rotate by the first driving mechanism. A plurality of sieve holes are provided on the cylinder wall of the centrifugal cylinder, and the distance between adjacent sieve holes is 1 to 2 cm. In this embodiment, 2 cm is taken. The sieve hole diameter of this embodiment is 0.04mm. The diameter is 1 cm; the alloy smelting and conveying mechanism is used to feed the interior of the centrifugal cylinder 605; the rolling assembly is arranged between the inner wall of the rolling cylinder 504 and the outer wall of the centrifugal cylinder 605, and the rolling assembly and the centrifugal cylinder 605 rotate synchronously. The rolling assembly is used to spread and roll the sieved alloy liquid onto the preform 505 when the alloy liquid in the centrifugal cylinder 605 is sieved by the sieve holes, and the heating assembly is used to heat the preform 505 on the rolling cylinder 504. Specifically, the preform 505 is a matrix prefabricated with carbon fiber material.

[0045] Among them, in order to make the preform 505 heated more evenly and facilitate the infiltration of the alloy liquid, the heating component of this embodiment specifically includes: an induction heating coil 404 arranged around the outer periphery of the rolling cylinder 504, and the induction heating coil 404 is electrically connected to the induction heating controller 402. Specifically, the induction heating coil 404 is spirally shaped and wound around the outer periphery of the rolling cylinder 504. The distance between the inner circle of the induction heating coil 404 and the outer circle of the rolling cylinder 504 is 2 to 3 cm. The induction heating coil 404 is connected to the wire, and the wire passes through the circular hole reserved at the bottom of the box 203 and is connected to the induction heating controller 402. An insulating and high-temperature resistant gasket is installed on the circular hole for source insulation.

[0046] Among them, Figure 3 The centrifuge cylinder 605 of this embodiment is specifically arranged to rotate as follows: a rotating shaft 601 is provided on each end surface of the centrifuge cylinder 605, and the rotating shaft 601 is rotatably connected to the roller cylinder 504 through a first bearing 602. One of the rotating shafts 601 passes through the roller cylinder 504 and is transmission-connected to the output end of the first driving mechanism. The other rotating shaft 601 is a first hollow shaft 601-1, which passes through the roller cylinder 504 and is connected to the discharge port of the alloy smelting and conveying mechanism.

[0047] Among them, Figure 1 As shown, the first driving mechanism includes a first motor 302, and the output end of the first motor 302 is connected to the rotating shaft 601 of the centrifugal cylinder 605 through a first belt transmission assembly. Specifically, the first belt transmission assembly includes a first belt 301, and the first belt 301 is connected to the pulley on the rotating shaft 601 and the pulley on the output shaft of the first motor 302.

[0048] Specifically, in order to ensure that the preform 505 can be heated quickly to facilitate the subsequent infiltration of the alloy liquid, this embodiment further includes an installation box 203, such as Figure 1 As shown, the installation box 203 includes a box body and a box cover 202. The inner wall of the installation box 203 is provided with a heat-insulating material. The heat-insulating material is Figure 3 The nano aerogel felt 403 shown, wherein Figure 2 and Figure 3 As shown, the roller 504 is rotatably arranged in the installation box 203 through the second hollow shaft connected at the end face, and one of the second hollow shafts is connected to the outer ring of the first hollow shaft 601-1 through the first bearing 602, and the extended end of the other second hollow shaft passes through the installation box 203 and is connected to the output end of the second driving mechanism. Specifically, as shown in FIG. Figure 3 As shown, the outer rings of the two second hollow shafts of the rolling cylinder 504 are connected to the mounting holes opened on the side wall of the mounting box 203 through the second bearing 501 and the fourth bearing 501-1, wherein, as shown in FIG. Figure 1 As shown, the second driving mechanism includes a second motor 303, and the output end of the second motor 303 is connected to the second hollow shaft of the roller cylinder 504 through a second belt transmission assembly. Specifically, the second belt transmission assembly includes a second belt 304, and the second belt 304 is connected to the pulley 503 on the second hollow shaft and the pulley of the output shaft of the second motor 303.

[0049] It should be noted that the centrifugal cylinder 605 is composed of two semicircular arcs and has a cylindrical cylinder structure. The surface of the cylinder is provided with sieve holes. The sieve holes have a hole pitch of about 1 to 2 cm and a diameter of 0.5 to 1 cm. Four rectangular bosses are evenly distributed along the circumference of the centrifugal cylinder 605 at both ends. The height of the boss is less than 1 / 2 of the wall thickness of the centrifugal cylinder 605 and the length is 6 to 8 times the wall thickness of the centrifugal cylinder 605, which is 6 times in this embodiment. The roller cylinder 504 is also composed of two semicircular arcs. The roller cylinder 504 is spliced ​​together, and four rectangular bosses are provided near both ends of the roller cylinder 504. The boss height is 1 / 2 of the wall thickness of the roller cylinder 504, and the boss length is 6 times the wall thickness of the roller cylinder 504. The diameter and width of the roller cylinder 504 are larger than the centrifugal cylinder 605, and the roller cylinder 504 is coaxial with the centrifugal cylinder 605. The end of the centrifugal cylinder 605 is provided with a centrifugal cylinder end cover 605-1, and the end of the roller cylinder 504 is provided with a roller cylinder end cover 502, and the centrifugal cylinder end cover 605-1 is provided. 05-1 and the roller cylinder end cover 502 are both disc-shaped, and are covered on the ends of the corresponding centrifugal cylinder 605 and roller cylinder 504. When covering, the rectangular bosses on the centrifugal cylinder 605 and roller cylinder 504 are inserted into the rectangular grooves on the centrifugal cylinder end cover 605-1 and the roller cylinder end cover 502 by plugging, so as to prevent the various mechanisms from slipping during rotation; secondly, the box body of the installation box 203 is a rectangular shell structure, and a group of symmetrical semicircular holes are arranged on the two wall surfaces in the width direction, and the center of the circle is located at the upper edge; the box cover 202 is a semicircular structure, and two semicircles are arranged radially, and the center of the circle is located at the center of the semicircle of the box cover 202; the box cover 203 is rotatably connected to the box body by two hinges, and after the box cover 202 is closed, the semicircle on the box cover 202 and the semicircle of the box body 203 form a circular mounting hole for mounting the second bearing 501. Secondly, a bearing end cover 201 is also provided outside the mounting hole.

[0050] Specifically, a vacuuming component is provided outside the installation box 203, and the vacuuming component is used to vacuum the installation box 203. Specifically, Figure 1 As shown, the vacuum pump assembly of this embodiment includes a vacuum pump 401, which is arranged outside the installation box 203. The air inlet of the vacuum pump 401 is connected to a stainless steel pipe 406. The port of the stainless steel pipe 406 is connected to the air extraction hole on the top of the installation box 203 through a pipe joint 407. When vacuuming is needed, it is only necessary to turn on the vacuum pump 401. The vacuum pump 401 can work to vacuum the installation box 203.

[0051] Among them, the alloy smelting and conveying mechanism of this embodiment specifically includes: Figure 1 The smelting furnace 103 shown in FIG. 1 has a rigid discharge pipe 104 connected to its discharge port. Figure 3As shown, after the discharge pipe 104 passes through the installation box 203, it extends into the centrifugal cylinder 605 through the first hollow shaft 601-1. In order to pressurize the interior of the smelting furnace 103, thereby facilitating the smelted alloy liquid to enter the centrifugal cylinder 605 from the discharge pipe 104, the smelting furnace 103 of this embodiment is also connected to the argon cylinder 101 through the hose 102. By introducing the protective gas into the smelting furnace 103, the alloy liquid is prevented from being oxidized.

[0052] Specifically, such as Figure 3 and Figure 5 As shown, in order to fully penetrate the alloy liquid into the preform 505, the rolling assembly of this embodiment specifically includes: at least a multiple of 2 rolling rollers, multiple groups of rolling rollers are evenly distributed around the center of the centrifugal cylinder 605, each group of rolling rollers is connected to the surface of the centrifugal cylinder end cover 605-1 of the centrifugal cylinder 605 through the rolling roller bracket 603, and the diameter of half of the rolling rollers in each group of rolling rollers is larger than the diameter of the other half of the rolling rollers, wherein, as shown in FIG. Figure 3 As shown, the rolling roller with a small diameter is the small rolling roller 604-1, and the rolling roller with a large diameter is the large rolling roller 604. The small rolling roller 604-1 is used to spread and pre-roll the sieved alloy liquid, and the large rolling roller 604 is used to roll the alloy liquid again after spreading and pre-rolling. In this embodiment, two rolling rollers are provided on each rolling roller bracket 603, and the diameters of the two rolling rollers are different. Specifically, as shown in FIG. Figure 5 As shown, the rolling roller bracket 603 of this embodiment includes a support plate, and the end of the support plate away from the rotating shaft 601 is provided with two mounting holes for rolling rollers, and the ends of the rolling rollers are rotatably connected to the mounting holes. An elongated groove is provided on the support plate along the length direction of the support plate, and a fastening screw 603-1 is passed through the elongated groove of the support plate. The fastening screw 603-1 is fixed to the centrifugal cylinder end cover 605-1 of the centrifugal cylinder 605 after passing through the elongated groove of the support plate. In order to better spread and roll during the rolling process, as shown in FIG. Figure 6 As shown, the diameters of the two rolling rollers on each support plate are different, that is, each support plate is provided with a large rolling roller 604 and a small rolling roller 604-1, in order to make the small rolling roller 604-1 roll the alloy liquid first, specifically, as shown in FIG. Figure 6 As shown, the small roller 604 - 1 in this embodiment is located on one side of the rotation direction of the centrifugal cylinder 605 .

[0053] It should be noted that when preparing thin-walled cylinders of different thicknesses, the distance between the rolling roller at the end of the support plate and the preform 505 on the inner wall of the rolling cylinder 504 is adjusted by loosening the fastening screw 603-1 and then moving the support plate. Then, the fastening screw 603-1 is passed through the oblong groove and connected to the threaded hole on the centrifugal cylinder end cover 605-1, thereby preparing thin-walled cylinders of different thicknesses. In addition to preparing cylinders made of carbon-aluminum composite materials in this embodiment, it can also be used to prepare composite cylinders made of fiber-reinforced Mg and Cu metals.

[0054] The present invention also discloses a method for forming a thin-walled tube of a centrifugal roller-pressed infiltration CF / Al composite material, comprising:

[0055] Step 1: Install the preform 505, add the smelting material, and check the airtightness of the installation box 203 and the smelting furnace 103;

[0056] Specifically, the preform 505 is mounted on the rolling cylinder 504 through the fixing ring 506, and then the polished aluminum alloy bar is placed in the melting furnace 103, and the furnace cover and box cover 202 of the melting furnace 103 are covered, and the air tightness of the installation box 203 and the inside of the furnace body is checked.

[0057] Step 2: Fill the smelting furnace 103 with protective gas and melt the material;

[0058] Specifically, the valve of the argon cylinder 101 is opened, and argon is filled into the melting furnace 103 as a protective gas. When the pressure in the melting furnace 103 reaches 0.5 MPa, the valve is closed, and the melting furnace 103 is operated to melt the aluminum alloy bars.

[0059] Step 3: Evacuate the installation box 203 and preheat the centrifugal cylinder 605, the rolling cylinder 504, the preform 505 and the rolling assembly in the installation box 203;

[0060] Specifically, turn on the vacuum pump 401 to evacuate the installation box 203 to form a negative pressure in the installation box 203. When the vacuum degree of the installation box 203 is lower than -0.09MPa, turn off the vacuum pump 401 and maintain it for 240s-300s. Then, check the air tightness of the installation box 203 again. The pressure reduction value of the installation box 203 meets the air tightness requirements within 8%. At the same time, turn on the induction heating controller 402 to preheat the inner centrifugal cylinder 605, rolling cylinder 504, carbon fiber preform 505 and rolling assembly of the installation box 203.

[0061] Step 4: When the temperature of the smelting furnace 103 reaches 750-820°C and the preheating temperature in the installation box 203 is 680-720°C, the roller cylinder 504 and the centrifugal cylinder 605 are controlled to operate and material is fed to the centrifugal cylinder 605;

[0062] Specifically, when the temperature of the smelting furnace 103 reaches 750-820°C and the preheating temperature in the installation box 203 is 680-720°C, turn on the first motor 302 of the centrifuge cylinder 605 and the second motor 303 of the roller cylinder 504, and adjust the speed of the first motor 302 to 1800-2000 / min, and the speed of the second motor 303 to 800-900 / min. Then, open the valve of the argon cylinder 101. When the air pressure in the smelting furnace 103 reaches 5-10 MPa, open the valve on the discharge pipe 104, and fill the argon cylinder 101 with the protective gas of the smelting furnace 103 to increase the pressure. Under the action of pressure, the aluminum liquid enters the high-speed rotating centrifuge cylinder 605 along the infusion pipe 104, and close the valve of the argon cylinder 101 after 5-10 seconds.

[0063] Step 5: Rolling the alloy liquid that hits the surface of the preform 505 after centrifugation for 5 to 8 minutes; after the rolling is completed, increase the speed of the centrifuge 605 and turn off the heating component;

[0064] Specifically, after closing the valve of the argon cylinder 101, the rotation speed of the centrifugal drum 605 is increased to 2000-2300 / min. The purpose is to ensure that the aluminum liquid is thrown out along the sieve holes on the centrifugal drum 605 while increasing the flight speed of the aluminum liquid. When the high-speed moving aluminum liquid hits the surface of the preform 505, part of the aluminum liquid will penetrate into the preform 505 to complete the initial infiltration. Then, since the angular velocity of the rolling roller of the rolling assembly is the same as that of the centrifugal drum, under the condition of high-speed rolling, the aluminum liquid can fully penetrate into the preform 505, wherein the small roller The pressure roller 604-1 pre-rolls and spreads the aluminum liquid, and the large rolling roller 604 rolls the aluminum liquid again to infiltrate the preform; after 5 to 8 minutes of rolling and infiltration, the speed of the first motor 302 is adjusted to 2300 to 2500 / min, and the speed of the second motor 303 is adjusted to 500 to 600 / min. After maintaining this speed for 3 to 5 minutes, the induction heating controller 402 switch is turned off. The purpose is to roll the surface of the initially formed CF / Al composite thin-walled tube with a high-speed rolling roller to improve the surface accuracy.

[0065] Step 6: When the preheating temperature in the box drops to 400-400°C, reduce the rotation speed of the roller cylinder 504 and the centrifugal cylinder 605 and maintain the reduced rotation speed for 15-20 minutes, turn off all equipment, and take out the CF / Al composite thin-wall cylinder.

[0066] Specifically, after turning off the heating, when the preheating temperature in the installation box 203 drops to 400-400°C, adjust the speed of the second motor 303 to 1300-1500 / min (i.e., reduce the speed), adjust the speed of the first motor 302 to 1000-1300 / min (reduce the speed), and then maintain it for 15-20 minutes, turn off all equipment, until the temperature in the installation box 203 drops to room temperature (25°C), open the box cover 202, remove the rolling cylinder 504, and take out the CF / Al composite material thin-walled cylinder.

[0067] In summary, the embodiment of the present invention provides a forming device and method for a centrifugal roller-impregnated CF / Al composite material thin-walled tube, which performs high-speed centrifugation on the slurry entering the centrifugal tube so that the slurry splashes from the sieve holes on the centrifugal tube onto the preform, thereby achieving the initial penetration of the slurry into the preform. Then, while the centrifugal tube rotates at high speed, the roller-pressing assembly rotates synchronously, thereby spreading and rolling the alloy slurry through the roller-pressing assembly. During the spreading and rolling process, the alloy slurry is uniformly infiltrated into the preform, and the preform is heated by the heating assembly to ensure that the temperature of the slurry and the temperature of the preform when the slurry intrudes into the preform are large. Temperature difference, so that while the alloy liquid is evenly dispersed and fully infiltrated into the preform, it is ensured that the liquid is fully integrated into the preform, thereby improving the forming quality of the composite thin-walled tube surface; secondly, due to the air entrainment during the forming process of the composite thin-walled tube, that is, the oxygen in the air will cause shrinkage holes to form inside the material, resulting in insufficient alloy liquid infiltration, which ultimately affects the mechanical properties of the material. Therefore, by setting up an installation box and evacuating the installation box when preparing the composite thin-walled tube, the oxidation of the alloy liquid and the problem of gas entrainment are avoided, and the infiltration quality of the alloy liquid into the preform is further guaranteed, further ensuring the forming quality of the composite thin-walled tube surface. In addition, by loosening the fastening screws and then moving the support plate, the distance between the rolling roller at the end of the support plate and the preform on the inner wall of the rolling tube can be adjusted, and then the fastening screws pass through the long circular groove and connect with the threaded hole on the end cover of the centrifugal tube to realize the limiting of the support plate, thereby realizing the preparation of thin-walled tubes of different thicknesses.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A forming device for centrifugal roller-impregnated CF / Al composite thin-walled tubes, characterized in that: include: A roller-pressing cylinder, the inner wall of which is provided with a preform; The centrifugal cylinder is concentrically and rotatably arranged in the roller cylinder, and a plurality of sieve holes are arranged on the cylinder wall of the centrifugal cylinder; A first driving mechanism is used to drive the centrifugal cylinder to rotate; An alloy smelting conveying mechanism, which is used to feed the interior of the centrifuge cylinder; The roller pressing assembly is arranged between the inner wall of the roller pressing cylinder and the outer wall of the centrifugal cylinder. The roller pressing assembly rotates synchronously with the centrifugal cylinder and is used to spread and roll the screened liquid onto the preform when the liquid in the centrifugal cylinder is screened through the sieve holes. and a heating component for heating the preform on the roller cylinder.

2. The forming device of a centrifugal roller-impregnated CF / Al composite thin-walled tube according to claim 1, characterized in that: The heating component comprises: an induction heating coil arranged around the outer circumference of the roller cylinder, and the induction heating coil is electrically connected to the induction heating controller.

3. The forming device for a centrifugal roller-impregnated CF / Al composite thin-walled tube according to claim 1, characterized in that: A rotating shaft is provided on each end surface of the centrifugal cylinder, and the rotating shaft is rotatably connected to the roller cylinder through a first bearing. One of the rotating shafts is transmission-connected to the output end of the first driving mechanism after passing through the roller cylinder, and the other rotating shaft is a first hollow shaft, which is connected to the discharge port of the alloy smelting and conveying mechanism after passing through the roller cylinder.

4. The forming device for a centrifugal roller-impregnated CF / Al composite thin-walled tube according to claim 3, characterized in that: It also includes an installation box, the inner wall of which is provided with thermal insulation material; the roller cylinder is rotatably arranged in the installation box through a second hollow shaft connected by the end face, and one of the second hollow shafts is connected to the outer ring of the first hollow shaft through a second bearing, and the extended end of the other second hollow shaft is connected to the second drive mechanism after passing through the installation box, and the second drive mechanism is used to drive the roller cylinder to rotate.

5. The forming device for a centrifugal roller-impregnated CF / Al composite thin-walled tube according to claim 4, characterized in that: It also includes a vacuuming component, which is used to vacuum the installation box.

6. The forming device for a centrifugal roller-impregnated CF / Al composite thin-walled tube according to claim 4, characterized in that: The alloy smelting and conveying mechanism includes a smelting furnace, the discharge port of which is connected to a rigid discharge pipe. The discharge pipe passes through the installation box and extends into the centrifugal cylinder through the first hollow shaft. The smelting furnace is also connected to an argon gas bottle through a hose.

7. The forming device for a centrifugal roller-impregnated CF / Al composite thin-walled tube according to claim 1, characterized in that: The rolling assembly includes at least multiples of rolling rollers, and multiple groups of rolling rollers are evenly distributed around the center of the centrifugal cylinder. Each group of rolling rollers is connected to the end face of the centrifugal cylinder through a rolling roller bracket, and the diameter of half of the rolling rollers in each group of rolling rollers is larger than the diameter of the other half of the rolling rollers. The rolling rollers with small diameters are used to spread and pre-roll the screened liquid, and the rolling rollers with large diameters are used to roll the liquid again after spreading and pre-rolling.

8. The forming device for a centrifugal roller-impregnated CF / Al composite thin-walled tube according to claim 7, characterized in that: The roller support includes a support plate, and two roller mounting holes are provided at one end of the support plate away from the rotating shaft. The ends of the rollers are rotatably connected to the mounting holes. An elongated groove is provided on the support plate along the length direction of the support plate, and a fastening screw is passed through the elongated groove of the support plate. The fastening screw is fixed to the end face of the centrifugal cylinder after passing through the elongated groove of the support plate; wherein the diameters of the two rollers on each support plate are different.

9. The forming device for a centrifugal roller-impregnated CF / Al composite thin-walled tube according to claim 4, characterized in that: The first drive mechanism and the second drive mechanism have the same structure. Both the first drive mechanism and the second drive mechanism include motors. The motor output end of the first drive mechanism is connected to the rotating shaft of the centrifugal cylinder through a first belt transmission assembly, and the motor output end of the second drive mechanism is connected to the second hollow shaft of the roller cylinder through a second belt transmission assembly.

10. A method for forming a thin-walled tube made of CF / Al composite material by centrifugal roller infiltration according to any one of claims 1 to 9, characterized in that: include: Install the prefabricated body, put in the smelting material, and check the airtightness of the installation box and the smelting furnace; Fill the melting furnace with protective gas and melt the materials; The installation box is vacuumed and the centrifugal cylinder, roller pressing cylinder, preform and roller pressing assembly in the installation box are preheated; When the temperature of the smelting furnace reaches 750~820℃ and the preheating temperature in the installation box is 680~720℃, the roller cylinder and the centrifugal cylinder are controlled to work and materials are fed to the centrifugal cylinder; The liquid material that hits the surface of the preform after centrifugation is rolled for 5 to 8 minutes; After the roller pressing is completed, increase the speed of the centrifuge drum and turn off the heating component; When the preheating temperature in the box drops to 400°C, reduce the rotation speed of the roller cylinder and the centrifugal cylinder, and maintain the reduced rotation speed for 15 to 20 minutes, turn off all equipment, and take out the CF / Al composite thin-wall cylinder.

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