Pipeline preparation method based on centrifugal casting device and centrifugal casting device

Abstract

The invention belongs to the technical field of pipeline preparation, and particularly relates to a pipeline preparation method based on a centrifugal casting device and the centrifugal casting device.The pipeline preparation method comprises the steps that 1, the inner side of a base material pipe is coated with mixed slurry of metal slurry and hard particles; 2, the base material pipe coated with the inner layer slurry is cured, and a base material pipe with a hard particle layer on the inner surface is formed; 3, the base material pipe is arranged in the pipe die; and 4, the inner surface of the hard particle layer is coated with molten metal in a centrifugal casting mode, and the formed pipeline with the inner surface containing the hard particles and the metal composite material is obtained after cooling and solidification. The pipeline with high hardness, high abrasion resistance and high high temperature resistance is prepared, the structural stability of the hard particle layer is improved through the composite metal layer, the individual requirements of various engineering fields for the pipeline are met, a release agent does not need to be used, the process is simple, operation is convenient, the production efficiency is high, and the method is suitable for large-scale industrial production and application.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pipeline preparation, and in particular, relates to a pipeline preparation method based on a centrifugal casting device and the centrifugal casting device. BACKGROUND

[0002] Centrifugal casting is a technology and method of injecting liquid metal into a high-speed rotating mold to make the metal liquid do centrifugal motion to fill the mold and form a casting. The centrifugal motion enables the liquid metal to fill the mold well in the radial direction and form the free surface of the casting.

[0003] The existing centrifugal casting device directly pours metal melt into the pipe mold. This preparation technology has the following problems: 1. The formed pipeline is difficult to demold, and a demolding agent needs to be used. The overall process is complex, the production efficiency is low, the manufacturing cost is high, and it is not suitable for large-scale industrial production; 2. It cannot prepare a multi-layer metal composite pipeline, the pipeline level form is single, the pipeline material is single, and it cannot meet the high requirements of various engineering fields on pipeline materials. SUMMARY

[0004] To solve the above problems, the present application provides a pipeline preparation method based on a centrifugal casting device and the centrifugal casting device. A base pipe is introduced, a hard particle layer is compounded on the inner surface of the base pipe, the base pipe with the hard particle layer is loaded into the pipe mold, and a metal layer is compounded on the inner surface of the hard particle layer. Not only a pipeline with high hardness, high wear resistance and high temperature resistance is prepared through the hard particle layer, but also the structural stability of the hard particle layer is improved by the compounded metal layer. Various personalized demands of engineering fields on pipelines can be met through multiple compounding. The base pipe is part of the structure of the prepared formed pipeline. After preparation, the base pipe can be directly taken out from the pipe mold without using a demolding agent. The process is simple and easy to operate, the process is simplified, the production efficiency is high, and it is suitable for large-scale industrial production and application.

[0005] In one aspect, the present application provides a pipeline preparation method based on a centrifugal casting device, which comprises the following steps:

[0006] Step 1: Mix viscous metal slurry and hard particles in proportion to prepare an inner layer slurry of the pipeline. The inner layer slurry is coated on the inner side of the base pipe. The metal slurry at least contains metal powder and organic viscous material;

[0007] Step 2: Solidify the base pipe coated with the inner layer slurry to form a base pipe with a hard particle layer on the inner surface;

[0008] Step 3: Install the substrate tube: the substrate tube with the inner surface having a layer of hard particles is sent into the inner side of the heating element inside the pipe mold and is fixedly connected with the pipe mold, a baffle provided with a central hole is installed at both ends of the pipe mold, and the heating element heats the substrate tube according to a predetermined temperature;

[0009] Step 4: The metal material required for the inner layer of the pipe is high-temperature smelted into a liquid state, and the temperature of the liquid metal is controlled to be above the solidification point of the metal, the metal melt is input into the inner side of the substrate tube, the pipe mold is driven to rotate at a predetermined speed to drive the substrate tube to rotate, so that the metal melt is uniformly distributed on the inner surface of the layer of hard particles, and the rotation is maintained while gradually cooling, and after cooling and solidification, a formed pipe with the inner surface containing hard particles and metal composite material is obtained.

[0010] Further, in step 1: the metal slurry is a micron-level slurry, the metal slurry is a micron-level slurry, the metal slurry is a micron-level slurry, including but not limited to one or more of ball-milled cast iron slurry, gray cast iron slurry, low-carbon steel slurry, alloy slurry and the like; the hard particles are millimeter-level particles, including but not limited to one or more of alumina, zirconia toughened alumina, zirconia, silicon carbide, boron carbide and silicon nitride and the like.

[0011] Further, in step 4: the metal material includes but is not limited to one or more of aluminum and aluminum alloy, copper and copper alloy, titanium alloy, steel and cast iron and the like.

[0012] Further, in step 4: the metal melting temperature is controlled to be at the solidification point of the corresponding metal or alloy or above 50°C above the solidification point.

[0013] Further, step 4 includes inputting the metal melt from the central hole of the baffle at one end of the pipe mold into the substrate tube.

[0014] Further, the preparation method further includes step 5: preparing a pipe with a multi-inner layer structure: after each layer of metal is solidified according to step 4, other liquid metal is poured on the inner surface of the innermost metal layer, and after multiple pouring, cooling and solidification, a formed pipe with the inner surface containing hard particles and a multi-layer metal layer composite material is obtained.

[0015] Further, in step 5: after the current pouring of the metal melt, the metal is cooled to below 100°C of the melting point, and then the metal melt to be poured next time is heated to above 50°C of the melting point of the metal and poured on the innermost inner surface for centrifugal casting.

[0016] On the other hand, the present invention provides a centrifugal casting apparatus, including a centrifugal casting apparatus body, a casting container and a driving mechanism; the centrifugal casting apparatus body is mounted on the driving mechanism, and the centrifugal casting apparatus body has a first opening and a second opening at both ends, the first opening is connected to the outlet of the casting container, the first opening is the inlet of the molten metal in the casting container into the inner wall of the centrifugal casting apparatus body, and the second opening is the inlet and outlet of the substrate tube.

[0017] Furthermore, the centrifugal casting device mainly includes a mold, a base material tube, a heating coil assembly, a conductive slip ring, a connecting ring, and a baffle assembly. The heating coil assembly is sleeved inside the mold and connected to it. There are two connecting rings, which are respectively installed inside both ends of the mold. The base material tube is sleeved inside the heating coil assembly and the two connecting rings. Both ends of the mold have openings, and each opening is fastened together by a baffle assembly. The baffle assemblies at both ends of the mold abut against both ends of the base material tube. The conductive slip ring is sleeved on the outer wall of the mold. The stator of the conductive slip ring is connected to an external power source via a connecting wire, and the rotor of the conductive slip ring is connected to the heating coil assembly via a connecting wire passing through a hole in the mold.

[0018] The present invention also provides an application of the centrifugal casting apparatus described above, wherein the centrifugal casting apparatus is applied in any of the above-described pipe preparation methods based on the centrifugal casting apparatus.

[0019] The beneficial effects of this invention are:

[0020] First, the pipe manufacturing method of the present invention uses a base pipe. Hard particles and metal materials are coated inside the base pipe and cured. The base pipe containing the hard particle layer is then placed into a pipe mold. A molten metal is poured onto the inner surface of the hard particle layer of the base pipe using centrifugal casting. This method not only prepares the hard particle layer of the pipe but also the metal layer on the inner surface of the hard particle layer, meeting the personalized needs of various engineering fields for pipes. The base pipe is part of the structure of the molded pipe. After preparation, the base pipe can be directly removed from the pipe mold without the need for a release agent. The process is simple, convenient, and streamlined, resulting in high production efficiency and suitability for large-scale industrial production and application.

[0021] Second, in the preferred implementation, the hard particle material in the preparation method of the present invention is one or more of millimeter-sized hard particles such as alumina, zirconia-toughened alumina (ZTA), zirconia, silicon carbide, boron carbide and silicon nitride, and the pipe made therefrom has high hardness, high wear resistance and high temperature resistance.

[0022] Third, in the preferred implementation, the preparation method of the present invention, after the hard particle layer is composited, solidifies a metal layer on the inner surface of the hard particle layer to further improve the structural stability of the bond between the hard particle layer and the substrate tube.

[0023] Fourth, in the preferred embodiment, the metal melting temperature in the preparation method of the present invention is controlled at the solidification point of the corresponding metal or alloy to 50°C above the solidification point, which can ensure that the liquid metal is in a liquid state when it is input into the substrate tube.

[0024] Fifth, the base material tube and the mold of the centrifugal casting device of the present invention are connected by a clamping mechanism, making it easy to disassemble and assemble the base material tube without the need for a release agent. Through multiple castings, pipes of different diameters and thicknesses can be cast, solving the problem of producing thin-walled pipes, and the production cost is relatively low. Attached Figure Description

[0025] Figure 1 This is a perspective structural diagram of the centrifugal casting apparatus according to an embodiment of the present invention;

[0026] Figure 2 This is a front view of a centrifugal casting apparatus according to an embodiment of the present invention;

[0027] Figure 3 yes Figure 2 A sectional view of AA;

[0028] Figure 4 This is a three-dimensional structural diagram of the tube mold, substrate tube, and conductive slip ring in an assembly state according to an embodiment of the present invention;

[0029] Figure 5 This is a perspective structural diagram of the heating coil assembly according to an embodiment of the present invention;

[0030] Figure 6 This is a perspective structural diagram of the connecting ring according to an embodiment of the present invention;

[0031] Figure 7 This is a perspective structural diagram of the baffle assembly according to an embodiment of the present invention;

[0032] Figure 8 This is a three-dimensional structural diagram of the driving mechanism according to an embodiment of the present invention;

[0033] Figure 9 This is a schematic diagram of the structure of a formed pipe prepared using the centrifugal casting apparatus and preparation method of the present invention.

[0034] Among them, 1-Centrifugal casting device body; 10-Pipe mold; 11-Base material tube; 12-Heating coil assembly; 120-Heating coil; 121-Fixing frame; 13-Conductive slip ring; 14-Connecting ring; 15-Baffle assembly; 150-Baffle body; 1500-First limiting protrusion ring; 1501-Second limiting protrusion ring; 151-Locking mechanism; 2-Casting container; 20-Conduit; 3-Drive mechanism; 30-Roller; 31-Bearing seat; 32-Rotating shaft; 33-Motor; A-Hard particle layer; B-Metal layer. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solutions of this application, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] The directional terms such as above, below, left, right, front, and back used in this application are based on the positional relationships shown in the attached drawings. Different attached drawings may result in different positional relationships, therefore they should not be interpreted as limitations on the scope of protection.

[0037] In this application, the terms "installation," "connection," "interlocking," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, or a connection that allows communication between components. They can also refer to a direct connection or an indirect connection through an intermediate medium. They can refer to the internal connection of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0038] This invention describes a pipe preparation method based on a centrifugal casting device and a centrifugal casting device. The centrifugal casting device includes a centrifugal casting device body 1, a drive mechanism 3 for rotating the centrifugal casting device body, and a casting container 2 for pouring molten metal into the centrifugal casting device body. The centrifugal casting device body 1 includes a base material tube 11, a heating element 12 surrounding the base material tube 11, and a tube mold 10 surrounding the heating element 12. The preparation process begins by treating the inner side of the substrate tube 11 to form a slurry coating. The substrate tube 11 coated with the slurry is then cured at high temperature to obtain a substrate tube 11 with a hard particle layer on the inner surface. The cured substrate tube 11 is then inserted into the mold 10 and secured to restrict axial movement. Using centrifugal casting, the heating element 12 preheats the substrate tube 11 at high temperature. The driving mechanism 3 drives the mold 10 to rotate, and the substrate tube 11 and the heating element 12 rotate together with the mold 10. High-temperature molten metal is introduced into the inner surface of the hard particle layer of the substrate tube 11, forming a metal coating on the inner surface of the hard particle layer. After cooling and solidification, a substrate tube 11 containing hard particles and metal materials is obtained. Finally, the substrate tube 11 is removed from the mold 10, completing the pipe preparation. This centrifugal casting device and preparation method enable the addition of a hard particle layer with high hardness, high wear resistance, and high temperature resistance to the inner side of the base material tube 11. By solidifying a metal layer on the inner surface of the hard particle layer, the structural stability of the bond between the hard particle layer and the base material tube is further improved. The base material tube and the tube mold are connected by a clamping connection. Compared with the existing centrifugal casting device, which requires the use of a release agent to demold the tube mold and the prepared formed pipe, this invention can directly remove the formed base material tube from the tube mold. The operation is simple, the manufacturing cost is low, and it meets the high requirements of various engineering fields for pipe materials.

[0039] The specific steps of the preparation method are as follows:

[0040] Step 1: Mix the viscous metal slurry and hard particles in a certain proportion to prepare the inner layer slurry of the pipe. Coat the inner layer slurry onto the inside of the substrate pipe. The metal slurry contains at least metal powder and organic adhesive material.

[0041] In step 1, the metal slurry is a micron-sized slurry, including but not limited to one or more of the following: slurry made from spherical cast iron, gray cast iron, low-carbon steel, and alloy. Specifically, the metal powder in the slurry includes, but is not limited to, one or more of the following: spherical cast iron powder, gray cast iron powder, low-carbon steel powder, or alloy powder. The organic binder material in the slurry includes, but is not limited to, one or a mixture of several of the following: 1,6-hexanediol diacrylate, pentaerythritol hexaacrylate, hydroxyethyl acrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, and acrylic acid.

[0042] The hard particles are millimeter-sized particles, including but not limited to one or more of the following millimeter-sized hard particles: alumina, zirconia-toughened alumina (ZTA), zirconia, silicon carbide, boron carbide, and silicon nitride.

[0043] The metal slurry also includes a solvent, an initiator, a dispersant, and a thickener. A certain proportion of metal powder, hard particles, solvent, organic adhesive material, initiator, dispersant, and thickener are added to a ball mill and ball-milled for a certain time to obtain a mixed slurry of viscous metal slurry and hard particles.

[0044] The solvent is alcohol, acetone, toluene, or a mixture thereof.

[0045] The initiator can be a thermal initiator or a photoinitiator. The thermal initiator is one or more of the following, but not limited to: benzoic acid peroxide, azobisisobutyronitrile, sodium azobiscyanopentate, sodium azo(2-(2-imidazoline)propane)hydrochloride, and azo(2-amidinylpropane)hydrochloride. The photoinitiator is one or more of the following, but not limited to: 1-hydroxycyclohexylphenyl ketone, trimethylbenzoyl-diphenylphosphine oxide, and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0046] The dispersant is one or more of ZN-1344, SP-710, and SP-6000, but is not limited to these.

[0047] The thickener is one or more of carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA), polyvinyl butyral (PVB), polyacrylamide (PAM), etc., but is not limited to these.

[0048] The ball mill can be a drum ball mill or a planetary ball mill, but is not limited to these. The grinding balls are cemented carbide balls. The ball-to-material ratio is 1:10 to 10:1. The ball milling time is 0.1 h to 50 h.

[0049] Step 2: Curing the substrate tube coated with the inner layer slurry to form a substrate tube with a hard particle layer on the inner surface.

[0050] The hard granular layer on the inner surface of the substrate tube includes at least two of the following forming methods:

[0051] Method 1:

[0052] S1: The substrate tube is set horizontally along the axis. The inner layer slurry is input into the bottom surface of the inner side of the substrate tube and evenly coated along the axial direction of the substrate tube, so that the inner layer slurry forms a circular arc layer on the bottom surface of the inner side of the substrate tube.

[0053] S2: Heating the substrate tube, under a predetermined temperature condition, causes the organic matter in the inner layer slurry to solidify and bond with the hard particles, forming an arc segment.

[0054] S3: The substrate tube is rotated gradually at a certain angle, and the inner layer slurry is applied to the inner bottom surface of the substrate tube adjacent to the cured arc segment. The process is repeated according to the predetermined temperature or UV curing until each arc segment is combined into a ring, resulting in a substrate tube with a hard particle layer on the inner surface.

[0055] Preferably, in step S3 of method one: the predetermined temperature is 0.65 times the melting point of the metal body in the inner slurry.

[0056] Method 2:

[0057] S1: The substrate tube is rotated using a centrifugal casting device. While rotating, an inner layer slurry is introduced into the substrate tube, and the inner layer slurry is coated onto the inner surface of the substrate tube.

[0058] S2: The substrate tube is heated synchronously to the melting point of the metal body in the inner layer slurry, so that the organic matter and hard particles in the inner layer slurry are solidified into a continuous whole. After solidification and cooling, a substrate tube with a hard particle layer on the inner surface is obtained.

[0059] Preferably, in S1 of method two: the centrifugal rotation speed of the substrate tube is 1 to 20,000 mm / s.

[0060] Step 3: Install the substrate tube: Send the substrate tube with a hard particle layer on the inner surface into the heating element inside the tube mold and fix it to the tube mold. Install baffles with central holes at both ends of the tube mold. The heating element heats the substrate tube at a predetermined temperature.

[0061] Preferably, the preheating temperature of the substrate tube is 700℃-1500℃.

[0062] Step 4: Melt the required metal material for the inner layer of the pipe into a liquid state at high temperature, and control the temperature of the liquid metal above the metal solidification point. Input the molten metal into the inner side of the base material pipe, drive the pipe mold to rotate the base material pipe at a predetermined speed, so that the molten metal is evenly distributed on the inner surface of the hard particle layer. While maintaining the rotation, gradually cool down. After cooling and solidification, a molded pipe with hard particles and metal composite material on the inner surface of the base material pipe is obtained.

[0063] Metallic materials include, but are not limited to, one or more of aluminum and aluminum alloys, copper and copper alloys, titanium alloys, steel, and cast iron.

[0064] Preferably, the metal melting temperature is controlled at the solidification point of the corresponding metal or alloy to 50°C above the solidification point, to ensure that the liquid metal is in a liquid state when it is input into the substrate tube.

[0065] Preferably, the preheating temperature of the substrate tube is 700℃-1500℃.

[0066] Preferably, the centrifugal rotation speed of the substrate tube is 1 to 20,000 mm / s.

[0067] Step 5: Prepare a multi-layered pipe: After each metal layer solidifies as in Step 4, pour other liquid metals onto the inner surface of the innermost metal layer. After multiple pouring, cooling, and solidification processes, a molded pipe with hard particles and multi-layered metal composite material on the inner surface of the substrate pipe is obtained.

[0068] Specifically, in step 5: after the previous pouring of molten metal, wait for the metal to solidify and cool to below its melting point of 100°C, then heat the next molten metal to be poured into the base tube to above its melting point of 50°C, and pour it onto the innermost inner surface for centrifugal casting.

[0069] Those skilled in the art should understand that, in other implementations of step 5, the molten metal poured each time can be molten metal of the same material or molten metal of different materials, or can be a mixture of the same or different molten metal and hard particles poured alternately, in order to meet the personalized needs of pipelines in various engineering fields.

[0070] Refer to the instruction manual appendix Figures 1-4 Another embodiment of the present invention provides a centrifugal casting apparatus, including a centrifugal casting apparatus body 1, a casting container 2, and a drive mechanism 3. The centrifugal casting apparatus body 1 is mounted on the drive mechanism 3 and is driven to rotate by the drive mechanism 3. The centrifugal casting apparatus body 1 has a first opening and a second opening at both ends. The first opening is connected to the outlet of the casting container 2 and is the inlet for the molten metal in the casting container 2 to enter the inner wall of the centrifugal casting apparatus body 1. The second opening is the inlet and outlet of the base material tube.

[0071] The main body 1 of the centrifugal casting device includes a tube mold 10, a base material tube 11, a heating coil assembly 12, a conductive slip ring 13, a connecting ring 14, and a baffle assembly 15.

[0072] The heating coil assembly 12 is sleeved inside the tube mold 10 and connected to the tube mold 10. There are two connecting rings 14, which are respectively installed inside both ends of the tube mold 10. The base material tube 11 is sleeved inside the heating coil assembly 12 and the two connecting rings 14. The connecting rings 14 are used to stably support the base material tube 11. Both ends of the tube mold 10 are provided with openings (i.e., the first opening and the second opening of the centrifugal casting device body 1). Each of the openings at both ends is fastened together by a baffle assembly 15. The baffle assemblies 15 at both ends of the tube mold 10 abut against the two ends of the base material tube 11. The two baffle assemblies 15 clamp the two ends of the base material tube 11 to achieve a fixed connection between the base material tube 11 and the tube mold 10.

[0073] The conductive slip ring 13 is sleeved on the outer wall of the tube mold 10. The stator of the conductive slip ring 13 is connected to an external power source through a connecting wire, and the rotor of the conductive slip ring 13 is connected to the heating coil assembly 12 through a connecting wire passing through the through hole of the tube mold 10.

[0074] The central axes of the tube mold 10, the base tube 11, the heating coil assembly 12, the conductive slip ring 13, the connecting ring 14, and the baffle assembly 15 are collinear. The baffle assembly 15 has a central hole smaller than the inner diameter of the base tube 11, which facilitates the casting container 2 to input the molten metal into the base tube 11 through the central hole, while preventing the molten metal from splashing to the outside under the centrifugal action of the centrifugal casting device body 1 rotating.

[0075] Refer to the instruction manual appendix Figure 5 In this embodiment, the heating coil assembly 12 uses an electromagnetic induction heating coil, which includes a heating coil 120 and a fixing frame 121. The fixing frame 121 is connected to the inner side of the tube mold 10 and is provided with four arc-shaped support columns, four support rods located inside the four arc-shaped support columns, and fixing rings connected to both sides of the four arc-shaped support columns and four support rods. There is a gap between the four arc-shaped support columns and four support rods, and the heating coil 120 is wound in a spiral between the four arc-shaped support columns and four support rods.

[0076] Preferably, matching threaded holes are made on the arc-shaped support columns of the tube mold 10 and the fixing frame 121, and the tube mold 10 and the fixing frame 121 are connected by fasteners to prevent the heating coil assembly 12 from moving axially inside the tube mold 10 during the rotation of the tube mold 10.

[0077] It should be noted that in this embodiment, the substrate tube 11 is formed by coating the inner layer of the pipe with slurry and curing it to form a hard particle layer, and then it is placed in the heating coil assembly 12 and fixedly connected to the tube mold 10.

[0078] The connection method between the connecting ring 14 and the tube mold 10 is the same as the connection method between the heating coil assembly 12 and the tube mold 10. Matching threaded holes are opened on the connecting ring 14 and the tube mold 10, and the connecting ring 14 and the tube mold 10 are connected by fasteners.

[0079] In this embodiment, the conductive slip ring 13 includes a stator and a rotor, with the rotor inside and the stator outside. The rotor is fixed on the tube mold 10, and the stator is installed with the external stop frame.

[0080] Refer to the instruction manual appendix Figure 6 In this embodiment, the connecting ring 14 is provided with multiple weight-reducing holes or grooves.

[0081] Refer to the instruction manual appendix Figure 7 In this embodiment, the baffle assembly 15 includes a baffle body 150 and a locking mechanism 151.

[0082] The tube mold 10 has flange faces at both ends that mate with the baffle body 150. One end face of the baffle body 150 has a first limiting protrusion ring 1500, and the flange face of the tube mold 10 has a limiting groove. The other end face of the baffle body 150 has multiple locking mechanisms 151. Each locking mechanism 151 includes a locking hook, a bracket, and a telescopic cylinder. The locking hook and the telescopic cylinder are mounted on the bracket, and the locking hook is connected to the bracket by a pin. The telescopic rod of the telescopic cylinder is connected to the locking hook by a pin. The locking hook can be controlled manually, pneumatically, or hydraulically. When installing the baffle assembly 15, the first limiting protrusion ring 1500 is inserted into the limiting groove on the flange face of the tube mold 10, so that the baffle body 150 and the two ends of the tube mold 10 are fastened together. When the telescopic rod of the telescopic cylinder extends, the locking hook is in a relaxed state. When the telescopic rod of the telescopic cylinder retracts, the locking hook locks the other side of the flange face of the baffle body and the tube mold 10.

[0083] In another implementation, the two connecting rings 14 are located inside the two end faces of the substrate tube 11, that is, at a certain distance from the two end faces of the substrate tube 11. The end face of the baffle body 150, which is provided with the first limiting protrusion 1500, is also provided with a second limiting protrusion 1501. The second limiting protrusion 1501 is concentrically arranged inside the first limiting protrusion 1500. The inner diameter of the second limiting protrusion 1501 matches the outer diameter of the substrate tube 11. During assembly, the substrate tube 11 can be embedded in the second limiting protrusion 1501, and the end face of the substrate tube 11 abuts against the baffle body 150. The second limiting protrusion 1501 and the connecting rings 14 have the same function, further providing stable support for the substrate tube 11.

[0084] Optionally, the baffle body 150 may be made of materials such as mica, ceramic, or gypsum.

[0085] In another implementation, the baffle body 150 is welded or bolted to the flange face of the tube mold 10.

[0086] In this embodiment, the casting container 2 includes a conduit 20. The baffle body 150 has a central hole, and the conduit 20 extends into the interior of the substrate tube 11 through the central hole of the baffle body 150.

[0087] Refer to the instruction manual appendix Figure 8In this embodiment, at least four drive mechanisms 3 are provided, with two drive mechanisms 3 arranged along the length of each side of the tube mold 10. Each drive mechanism 3 includes a roller 30, a bearing housing 31, a rotating shaft 32, a motor 33, and a mounting bracket. Two bearing housings 31 are spaced apart on the mounting bracket, each housing a bearing. The roller 30 is located between the two bearing housings 31, and is coaxial with the central holes of the two bearings. The rotating shaft 32 passes through the central holes of the two bearings and the roller 30. Each end of the rotating shaft 32 is connected to the output shaft of a motor 33. The motor 33 drives the roller 30 to rotate, thereby causing the tube mold 10, the substrate tube 11, and the baffle assembly 15 to rotate as a whole.

[0088] Refer to the instruction manual appendix Figure 9 The formed pipe is a shaped pipe prepared using the centrifugal casting apparatus and preparation method of the present invention. The shaped pipe includes a base pipe 11, a hard particle layer A, and a metal layer B.

[0089] After the formed pipe is prepared in the centrifugal casting device, the baffle assembly 15 is removed from the side of the pipe mold 10 where the casting container 2 is not set, and the connecting ring 14 and the base material pipe 11 are pulled out of the pipe mold 10 together.

[0090] Based on the above centrifugal casting device and pipe preparation method, the preparation method of pipes made of hard particles and single-layer metal composite materials is described in Examples 1-3 with specific parameters, and the preparation method of pipes made of hard particles and multi-layer metal composite materials is described in Examples 4-6.

[0091] Example 1

[0092] Preparation of D 50 Composite pipe made of 15mm millimeter-sized TiC ceramic particles and spherical cast iron HT.

[0093] Weigh out 1 kg of HT powder for ball milling cast iron and TiC ceramic particles (D). 50 0.12 kg of 15mm cast iron HT and TiC ceramic particles, 50 g of toluene, 10 g of hydroxyethyl methacrylate, 0.5 g of methylenebisacrylamide, and 0.01 g of dispersant SP-6000 were added to a drum ball mill and ball-milled for 2 hours. Then, 5 g of carboxymethyl cellulose was added in three portions, and the mixture was ball-milled for another hour. Finally, 0.1 g of azobisisobutyronitrile was added, and the mixture was ball-milled for another hour to obtain the ball-milled cast iron HT and TiC ceramic particles (D). 50 A 15mm (15mm) mixed slurry was prepared. This slurry was applied to the inner wall of a substrate tube, and the tube was heated to cure the slurry. Millimeter-sized TiC ceramic particles (D) were then deposited onto the tube. 50A 15mm thick layer of ductile iron (HT) is bonded and fixed to the inner surface of the substrate tube to form a hard granular layer. The substrate tube containing the hard granular layer is then inserted into a mold. Removable circular graphite baffle assemblies are installed at both ends of the mold to secure the substrate tube. The substrate tube is preheated to 1300℃ by a heating coil. After adjusting the dynamic balance via a drive mechanism, the mold and substrate tube are rotated at a high speed of 1500 rad / min. Simultaneously, molten ductile iron (HT) from a casting vessel is poured onto the inner surface of the hard granular layer of the substrate tube. After cooling and solidification, D is obtained. 50 Composite pipe made of 15mm millimeter-sized TiC ceramic particles and spherical cast iron HT.

[0094] The D prepared in Example 1 50 Wear resistance testing was conducted on a composite pipe made of 15mm TiC ceramic particles and ductile cast iron HT. The testing standard for wear resistance was GB / T34501-2017. The test results showed that the abrasive wear of this composite material was 0.7g / 10min, indicating high wear resistance.

[0095] The D prepared in Example 1 50 A composite pipe containing 15mm-sized TiC ceramic particles and milled cast iron HT was analyzed longitudinally using scanning electron microscopy, revealing D... 50 The bonding between 15mm TiC ceramic particles and ductile cast iron HT is crack-free, and the TiC ceramic particles are uniformly distributed in ductile cast iron HT.

[0096] Example 2

[0097] Preparation of D 50 Composite pipe made of 20mm millimeter-sized SiC ceramic particles and low-carbon steel Q235.

[0098] Weigh out 0.85 kg of low-carbon steel Q235 powder and 0.15 kg of SiC ceramic particles (D). 50 20mm), 40g of hydroxyethyl methacrylate, 10g of pentaerythritol triacrylate, and 0.1g of dispersant ZN-1344 were added to a drum ball mill and ball-milled for 1.5h. Then, 6g of polyvinyl alcohol was added in three portions, and the mixture was ball-milled for another hour. Finally, 0.1g of benzoic acid peroxide was added, and the mixture was ball-milled for another 0.5h to obtain low-carbon steel Q235 and SiC ceramic particles (D 50 A 20mm (20mm) mixed slurry was applied to the inner wall of a substrate tube. The substrate tube was then heated to cure the slurry, after which millimeter-sized SiC ceramic particles (D...) were deposited. 50A 20mm thick layer of low-carbon steel Q235 is connected and fixed to the inner surface of the substrate tube to form a hard particle layer. The substrate tube containing the hard particle layer is then inserted into a tube mold. Removable circular graphite baffle assemblies are installed at both ends of the mold to secure the substrate tube. A heating coil preheats the substrate tube to 1500℃. After adjusting the dynamic balance via a drive mechanism, the substrate tube is rotated at a high speed of 2000 rad / min. Simultaneously, molten low-carbon steel Q235 from a casting vessel is poured onto the inner surface of the hard particle layer of the substrate tube. After cooling and solidification, the product D is obtained. 50 Composite pipe made of 20mm millimeter-sized SiC ceramic particles and low-carbon steel Q235.

[0099] The D prepared in Example 2 50 Wear resistance testing was conducted on a composite pipe made of 20mm-sized SiC ceramic particles and low-carbon steel Q235. The testing standard for wear resistance was GB / T34501-2017. The test results showed that the abrasive wear of this composite material was 0.65g / 10min, indicating high wear resistance.

[0100] The D prepared in Example 2 50 A composite pipe containing 20mm-sized SiC ceramic particles and low-carbon Q235 steel was analyzed longitudinally using scanning electron microscopy, revealing D... 50 The bonding between 20mm-sized SiC ceramic particles and low-carbon steel Q235 is crack-free, and the SiC ceramic particles are uniformly distributed in the low-carbon steel Q235.

[0101] Example 3

[0102] Preparation of D 50 Composite pipe made of 5mm millimeter-sized Al2O3 ceramic particles and ZL101 aluminum alloy.

[0103] Weigh out 0.90 kg of ZL101 aluminum alloy powder and 0.1 kg of Al2O3 ceramic particles (D). 50 5mm), 20g of alcohol, 30g of hydroxyethyl acrylate, 10g of trimethylolpropane triacrylate, and 0.05g of dispersant SP-710 were added to a drum ball mill and ball-milled for 2 hours. Then, 4g of polyacrylamide was added in three portions, and the mixture was ball-milled for another hour. Finally, 0.1g of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide was added, and the mixture was ball-milled for another hour to obtain ZL101 aluminum alloy and Al2O3 ceramic particles (D 50 A 5mm (5mm) mixed slurry was applied to the inner wall of a substrate tube. The substrate tube was then heated to cure the slurry, after which millimeter-sized Al2O3 ceramic particles (D) were deposited. 50A 5mm thick ZL101 aluminum alloy is bonded and fixed to the inner surface of the substrate tube to form a hard particle layer. The substrate tube containing the hard particle layer is then inserted into a tube mold. Removable circular graphite baffle assemblies are installed at both ends of the tube mold to secure the substrate tube. The substrate tube is preheated to 750℃ by a heating coil. After adjusting the dynamic balance via a drive mechanism, the tube mold and substrate tube are rotated at a high speed of 1700 rad / min. Simultaneously, molten ZL101 aluminum alloy from a casting container is poured onto the inner surface of the hard particle layer of the substrate tube, producing D... 50 Composite pipe made of 5mm millimeter-sized Al2O3 ceramic particles and ZL101 aluminum alloy.

[0104] The D prepared in Example 3 of this study 50 Wear resistance testing was conducted on a composite pipe made of 5mm Al2O3 ceramic particles and ZL101 aluminum alloy. The testing standard for wear resistance was GB / T34501-2017. The test results showed that the abrasive wear of this composite material was 0.68g / 10min, indicating high wear resistance.

[0105] The D prepared in Example 3 of this study 50 A composite pipe containing 5mm-sized Al2O3 ceramic particles and ZL101 aluminum alloy was analyzed longitudinally using scanning electron microscopy, revealing D... 50 The bonding between 5mm millimeter-sized Al2O3 ceramic particles and ZL101 aluminum alloy is crack-free, and the Al2O3 ceramic particles are uniformly distributed in ZL101 aluminum alloy.

[0106] Example 4

[0107] Preparation of D 50 Pipes made of 8mm TiC ceramic particles and manganese steel NM600 and 6061 aluminum alloy composite materials.

[0108] Weigh out 0.80 kg of NM600 manganese steel powder and 0.20 kg of TiC ceramic particles (D). 50 50g of toluene, 10g of hydroxyethyl methacrylate, 0.5g of methylenebisacrylamide, and 0.02g of dispersant SP-6000 were added to a drum ball mill and ball-milled for 1 hour. Then, 6g of methylcellulose was added in four portions, and the mixture was ball-milled for another 0.5 hours. Finally, 0.2g of trimethylbenzoyl-diphenylphosphine oxide was added, and the mixture was ball-milled for another hour to obtain a slurry of manganese steel NM600 and TiC ceramic particles (D50 8mm). This slurry was coated onto the inner wall of a substrate tube. After the substrate tube was heated to cure the slurry, millimeter-sized TiC ceramic particles (D50 8mm) were then added. 50An 8mm thick layer of manganese steel NM600 is bonded and fixed to the inner surface of the substrate tube to form a hard particle layer. The substrate tube containing the hard particle layer is then inserted into a tube mold. Removable circular graphite baffle assemblies are installed at both ends of the tube mold to secure the substrate tube. A heating coil preheats the substrate tube to 1400℃. After adjusting the dynamic balance via a drive mechanism, the tube mold and substrate tube are rotated at a high speed of 1600 rad / min. Simultaneously, molten manganese steel NM600 from a casting vessel is poured onto the inner surface of the hard particle layer of the substrate tube. After cooling and solidification, molten 6061 aluminum alloy is poured onto the inner surface of the manganese steel NM600 metal layer. This process is repeated to obtain D. 50 Pipes made of 8mm TiC ceramic particles and manganese steel NM600 and 6061 aluminum alloy composite materials.

[0109] Example 5

[0110] Preparation of D 50 Pipes made of 15mm millimeter-sized Al2O3 particles, 2024 aluminum alloy, and high-chromium cast iron Cr28 composite material.

[0111] Weigh out 0.95 kg of 2024 aluminum alloy powder and 0.25 kg of Al2O3 particles (D). 50 15mm), 40g of hydroxyethyl methacrylate, 10g of 1,6-hexanediol diacrylate, and 0.1g of dispersant ZN-1344 were added to a drum ball mill and ball-milled for 1.5h. Then, 5g of polyvinyl butyral was added in three portions, and the mixture was ball-milled for another hour. Finally, 0.1g of 1-hydroxycyclohexylphenyl ketone was added, and the mixture was ball-milled for another 0.5h to obtain 2024 aluminum alloy and Al2O3 ceramic particles (D 50 A 15mm (15mm) mixed slurry was applied to the inner wall of a substrate tube. The substrate tube was then heated to cure the slurry, after which millimeter-sized Al2O3 ceramic particles (D) were deposited. 50 A 15mm thick layer of 2024 aluminum alloy is bonded and fixed to the inner surface of the substrate tube to form a hard particle layer. The substrate tube containing the hard particle layer is then inserted into a tube mold. Removable circular graphite baffle assemblies are installed at both ends of the tube mold to secure the substrate tube. A heating coil preheats the substrate tube to 1300℃. After adjusting the dynamic balance via a drive mechanism, the tube mold and substrate tube rotate at a high speed of 1800 rad / min. Simultaneously, molten 2024 aluminum alloy from a casting vessel is poured onto the inner surface of the hard particle layer of the substrate tube. After cooling and solidification, molten high-chromium cast iron (Cr28) is poured onto the inner surface of the 2024 aluminum alloy metal layer. This process is repeated until D is obtained. 50 Pipes made of 15mm millimeter-sized Al2O3 particles, 2024 aluminum alloy, and high-chromium cast iron Cr28 composite material.

[0112] Example 6

[0113] Preparation of D 50 Pipes made of 10mm ZrO2 ceramic particles in composite material with HT250 (a type of gray cast iron) and H59 copper alloy.

[0114] Weigh out 0.75 kg of HT250 powder and 0.2 kg of ZrO2 ceramic particles (D). 50 10g of acetone, 20g of hydroxyethyl acrylate, 30g of dipentaerythritol hexaacrylate, and 0.1g of dispersant SP-710 were added to a drum ball mill and ball-milled for 2 hours. Then, 4g of carboxymethyl cellulose was added in three portions, and the mixture was ball-milled for another hour. Finally, 0.1g of sodium azobiscyanovalerate was added, and the mixture was ball-milled for another hour to obtain HT250 and ZrO2 ceramic particles (D). 50 A 10mm (10mm) mixed slurry was prepared. This slurry was applied to the inner wall of a substrate tube, and the tube was heated to cure the slurry, resulting in millimeter-sized ZrO2 ceramic particles (D...). 50 A 10mm thick layer of HT250 is bonded and fixed to the inner surface of the substrate tube to form a hard particle layer. The substrate tube containing the hard particle layer is then inserted into a mold. Removable circular graphite baffle assemblies are installed at both ends of the mold to secure the substrate tube. A heating coil preheats the substrate tube to 1400℃. After adjusting the dynamic balance via a drive mechanism, the mold and substrate tube rotate at a high speed of 1800 rad / min. Simultaneously, molten HT250 liquid is poured from a casting container onto the inner surface of the hard particle layer of the substrate tube. After cooling and solidification, molten H59 copper alloy liquid is poured onto the inner surface of the HT250 liquid metal layer. This process is repeated to obtain D. 50 Pipes made of 10mm ZrO2 ceramic particles and HT250 and H59 copper alloy composites.

[0115] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics of the solutions is not described in detail here. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for preparing pipes based on a centrifugal casting device, characterized in that, The preparation method includes the following steps: Step 1: Mix the viscous metal slurry and hard particles thoroughly in a certain proportion to prepare the inner layer slurry of the pipe. Coat the inner layer slurry onto the inside of the substrate pipe. The metal slurry contains at least metal powder and organic adhesive material. Step 2: Curing the substrate tube coated with the inner layer slurry to form a substrate tube with a hard particle layer on the inner surface; Step 3: Install the substrate tube: Send the substrate tube with a hard particle layer on the inner surface into the heating element inside the tube mold and fix it to the tube mold. Install baffles with central holes at both ends of the tube mold. The heating element heats the substrate tube at a predetermined temperature. Step 4: Melt the required metal material for the inner layer of the pipe into a liquid state at high temperature, and control the temperature of the liquid metal above the metal solidification point. Input the molten metal into the inner side of the base material pipe, drive the pipe mold to rotate the base material pipe at a predetermined speed, so that the molten metal is evenly distributed on the inner surface of the hard particle layer. While maintaining the rotation, gradually cool down. After cooling and solidification, a molded pipe with hard particles and metal composite material on the inner surface of the base material pipe is obtained.

2. The pipe preparation method based on a centrifugal casting device according to claim 1, characterized in that, In step 1: the metal slurry is a micron-sized slurry, including but not limited to one or more of the following: ball milled cast iron slurry, gray cast iron slurry, low carbon steel slurry, alloy slurry, etc.; the hard particles are millimeter-sized particles, including but not limited to one or more of the following: alumina, zirconia-toughened alumina, zirconia, silicon carbide, boron carbide, and silicon nitride, etc.

3. The pipe preparation method based on a centrifugal casting device according to claim 1, characterized in that, In step 4: the metallic materials include, but are not limited to, one or more of aluminum and aluminum alloys, copper and copper alloys, titanium alloys, steel and cast iron.

4. The pipe preparation method based on a centrifugal casting device according to claim 1, characterized in that, In step 4: the metal melting temperature is controlled at the solidification point of the corresponding metal or alloy to 50°C above the solidification point.

5. The pipe preparation method based on a centrifugal casting device according to claim 1, characterized in that, Step 4 involves introducing molten metal into the substrate tube through the center hole of a baffle at one end of the tube mold.

6. The pipe preparation method based on a centrifugal casting device according to claim 1, characterized in that, The preparation method further includes step 5: preparing a pipe with a multi-inner-layer structure: after each metal layer solidifies according to step 4, other liquid metals are poured onto the inner surface of the innermost metal layer again. After multiple pouring, cooling and solidification, a molded pipe with hard particles and multi-layer metal composite material on the inner surface of the substrate pipe is obtained.

7. The pipe preparation method based on a centrifugal casting device according to claim 6, characterized in that, In step 5: After the previous pouring of molten metal, wait for the metal to solidify and cool to below its melting point of 100°C, then heat the next molten metal to be poured into the base tube to above its melting point of 50°C, and pour it onto the innermost inner surface for centrifugal casting.

8. A centrifugal casting apparatus, characterized in that, It includes a centrifugal casting device body (1), a casting container (2), and a drive mechanism (3); the centrifugal casting device body (1) is mounted on the drive mechanism (3), and the centrifugal casting device body (1) has a first opening and a second opening at both ends. The first opening is connected to the outlet of the casting container (2). The first opening is the inlet for the molten metal in the casting container (2) to enter the inner wall of the centrifugal casting device body (1), and the second opening is the inlet and outlet of the base material tube.

9. The centrifugal casting apparatus according to claim 8, characterized in that, The centrifugal casting device body (1) includes a tube mold (10), a base material tube (11), a heating coil assembly (12), a conductive slip ring (13), a connecting ring (14), and a baffle assembly (15). The heating coil assembly (12) is sleeved inside the tube mold (10) and connected to the tube mold (10). There are two connecting rings (14), which are respectively installed inside both ends of the tube mold (10). The base material tube (11) is sleeved on the heating coil assembly (12) and the two connecting rings (13). 14) On the inner side, the tube mold (10) has openings at both ends, and each of the openings is fastened together by a baffle assembly (15). The baffle assemblies (15) at both ends of the tube mold (10) abut against the two ends of the base tube (11). The conductive slip ring (13) is sleeved on the outer wall of the tube mold (10). The stator of the conductive slip ring (13) is connected to an external power source through a connecting wire. The rotor of the conductive slip ring (13) is connected to the heating coil assembly (12) through a connecting wire passing through the through hole of the tube mold (10).

10. An application of the centrifugal casting apparatus according to any one of claims 8-9, characterized in that, The centrifugal casting apparatus is used in the pipe preparation method based on the centrifugal casting apparatus according to any one of claims 1-7.

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