Method for preparing large-specification laminated material through semi-solid delayed solidification forming

Abstract

The invention belongs to the technical field of layered structure composite material preparation, and discloses a method for preparing a large-size laminated material through semi-solid delayed solidification forming, aluminum and titanium are used as raw materials, semi-solid delayed solidification die-casting forming equipment is utilized, and the large-size laminated material is prepared through surface treatment, titanium plate presetting, charging barrel and die preheating, charging, feeding, die-casting forming and delayed solidification annealing. And preparing the aluminum-titanium laminated composite material. According to the method for preparing the large-size laminated material through semi-solid delayed solidification forming, aiming at the technical current situations that a large-size aluminum-titanium laminated composite material is difficult to prepare, defects are easily introduced into a heterogeneous interface and the interface bonding strength is low, the preparation problem of the large-size aluminum-titanium laminated composite material in the prior art is solved; an obvious interface bonding layer is formed between the titanium layer and the aluminum layer of the prepared aluminum-titanium laminated composite material, defects such as pores and cracks do not exist, the heterogeneous interface bonding is good, the bonding strength is high, and the aluminum-titanium laminated composite material has obvious technical advantages and process advancement.

Description

Technical Field

[0001] The invention belongs to the technical field of preparation of layered structure composite materials, and in particular relates to a method for preparing large-scale laminated materials by semi-solid delayed solidification molding. Background Art

[0002] Aluminum-titanium laminated composite materials are composed of aluminum and titanium alternately stacked and connected, with a layered configuration and the performance characteristics of both aluminum and titanium. They are a layered structural material that can simultaneously improve the strength and ductility of the material and have broad application prospects. At present, the preparation of aluminum-titanium laminated composite materials is mainly through sintering and hot rolling processes. The aluminum-titanium laminated composite materials prepared by the sintering process have a good interface structure, but they are limited by the mold and cannot be prepared in large sizes. This seriously limits the application of aluminum-titanium laminated composite materials. When the aluminum-titanium laminated composite material is prepared by the hot rolling process, the roller pressure will cause stress concentration at the interface of the laminated material, and even cause local defects, which will reduce the interface bonding quality of the aluminum-titanium laminated composite material. In addition, the hot rolling process is short, and it is difficult to form sufficient intermetallic compounds between heterogeneous layers, resulting in low interface strength.

[0003] Therefore, in order to broaden the application field of aluminum-titanium laminated composite materials and improve the interface bonding quality, the field urgently needs to develop a preparation method for large-scale laminated materials. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing large-scale laminated materials by semi-solid delayed solidification molding in view of the background technology. Aluminum and titanium are used as raw materials and an aluminum-titanium laminated composite material is prepared by a semi-solid delayed solidification molding process to solve the technical problems in the prior art such as the inability to prepare large-scale aluminum-titanium laminated composite materials, defects in heterogeneous interfaces and low interface bonding strength.

[0005] The technical solution of the present invention is as follows: A method for preparing large-scale laminated materials by semi-solid delayed solidification molding, using aluminum and titanium as raw materials, using semi-solid delayed solidification die-casting molding equipment, surface treatment, pre-setting titanium plates, preheating barrels and molds, adding materials, feeding, die-casting, and delayed solidification annealing to prepare aluminum-titanium laminated composite materials, the semi-solid delayed solidification die-casting molding equipment comprising: a storage funnel, a feeding funnel, a feeding screw, a feeding channel, a semi-solid section heater, a melting section heater, a die-casting preparation zone heater, and an injection zone heater , a rotary drive mechanism, a hydraulic transmission rod, a barrel, a spiral shearing conveying rod, a heating sleeve, an injection punch, an injection storage area, a discharge joint, a main channel, a mold cavity, a mold, a heat transfer oil injection pipe, a heat transfer oil return pipe, a mold temperature controller, a fixed mold, and a movable mold, wherein the storage funnel, the feeding funnel, and the feeding channel are sequentially connected and interconnected, the feeding screw is arranged in the feeding funnel, and the discharge port of the feeding channel is connected to the feed end of the barrel; the spiral shearing conveying rod is arranged inside the barrel, and the injection punch is arranged in the barrel The rotary drive mechanism and the hydraulic transmission rod are arranged on the feeding end side of the barrel near the discharge end, the rotary drive mechanism is used to drive the spiral shearing conveying rod, and the hydraulic transmission rod is used to drive the injection punch; from the feeding end to the discharge end, the barrel is divided into a semi-solid zone, a melting zone, a die-casting preparation zone, and an injection zone, and the injection storage zone is arranged in the injection zone and located at the discharge end port of the barrel; the heating sleeve is sleeved on the outer periphery of the barrel, and the semi-solid zone heater, the melting zone heater, the die-casting preparation zone heater, and the injection zone heater are coated on the outer periphery of the heating sleeve, and the setting positions of the semi-solid zone heater, the melting zone heater, the die-casting preparation zone heater, and the injection zone heater correspond to the semi-solid zone, the melting zone, the die-casting preparation zone, and the injection zone of the barrel respectively; the discharge joint is arranged on the discharge end side of the barrel, one end of the main channel is connected to the barrel via the discharge joint, and the other end of the main channel is connected to the mold cavity of the mold, the mold includes a fixed mold and a movable mold, and the mold temperature controller is connected to the mold via a heat transfer oil injection pipe and a heat transfer oil return pipe; The method for preparing large-scale laminated materials by semi-solid delayed solidification molding comprises the following steps: (1) Surface treatment of titanium plate Perform surface corrosion treatment, cleaning and polishing on the titanium plate to remove oxides and impurities on the titanium plate surface, eliminate scratches on the titanium plate surface, and increase the surface flatness of the titanium plate; (2) Pre-set titanium plate According to the size of the mold cavity, the surface-treated titanium plate is cut into two titanium plates, and the two titanium plates are respectively pre-fixed on the cavity walls of the fixed mold and the movable mold, and then the movable mold and the fixed mold are molded together, wherein the length and width of each titanium plate match the length and width of the mold cavity, and the relationship between the thickness of each titanium plate and the depth of the mold cavity satisfies: B=2A / 3, B is the thickness of the titanium plate, 2A is the depth of the mold cavity, wherein the depth of the cavity part in the fixed mold and the movable mold is A respectively; (3) Preheat the barrel and mold The barrel is preheated through the semi-solid zone heater, the melting zone heater, the die casting preparation zone heater, the injection zone heater and the heating sleeve, and the mold temperature controller is turned on to preheat the mold, wherein the heating temperature of the semi-solid zone heater is set to 580°C, the heating temperature of the melting zone heater is set to 660°C, the heating temperature of the die casting preparation zone heater is set to 680°C, the heating temperature of the injection zone heater is set to 700°C, and the heating temperature of the mold temperature controller is set to 660°C; (4) Adding materials Aluminum particles are poured into the storage funnel, and the aluminum particles flow quantitatively into the feeding funnel through the conical outlet of the storage funnel. The feeding screw in the feeding funnel rotates to continuously feed the aluminum particles into the barrel through the feeding channel; (5) Feeding The rotary drive mechanism drives the spiral shearing conveying rod to rotate. The rotation of the spiral shearing conveying rod conveys the aluminum particles toward the discharge end of the barrel, and at the same time applies shear force to the aluminum particles. During the conveying process, the aluminum particles first pass through the semi-solidification zone of the barrel. Under the combined action of the heating of the semi-solid zone heater and the shearing of the spiral shearing conveying rod, the aluminum particles form semi-solid aluminum slurry. Then the semi-solid aluminum slurry passes through the melting zone of the barrel. The solid particles in the semi-solid aluminum slurry are further melted by the melting zone heater to form aluminum liquid. The aluminum liquid is transmitted by the spiral shearing conveying rod, passes through the die-casting preparation zone of the barrel, and enters the injection zone. It is further heated by the die-casting preparation zone heater and the injection zone heater. Finally, the aluminum liquid is conveyed to the injection storage area located at the discharge end of the barrel. (6) Die casting The hydraulic transmission rod pushes the injection punch to press the aluminum liquid in the injection storage area into the gap between the two titanium plates inside the mold cavity through the main channel. After the gap is filled with aluminum liquid, the injection punch continues to apply pressure to the aluminum liquid to maintain the pressure under the push of the hydraulic transmission rod; (7) Delayed solidification annealing The holding pressure was adjusted to 0.5 MPa, and the set heating temperature of the mold temperature controller was lowered to 600°C. The mold was kept warm for 90 minutes to delay the solidification of the aluminum liquid in the mold cavity. At the same time, the aluminum liquid and the titanium plate were annealed to achieve aluminum-titanium interface bonding and form an aluminum-titanium laminated composite casting. (8) Demolding After the delayed solidification annealing is completed, the movable mold is moved away from the fixed mold, the mold cavity is opened, and the aluminum-titanium laminated composite material casting is demolded and taken out of the mold.

[0006] Furthermore, in the above-mentioned method for preparing large-scale laminated materials by semi-solid delayed solidification molding, the titanium plate surface treatment step specifically includes: corroding the surface of the titanium plate with hydrofluoric acid to remove oxides on the surface of the titanium plate; cleaning the corroded surface of the titanium plate with anhydrous ethanol to wash away the hydrofluoric acid and impurities; selecting 200-grit sandpaper to polish the surface of the titanium plate to quickly eliminate the residual impurity layer on the surface of the titanium plate; selecting 400-grit and 800-grit sandpaper respectively, and polishing the surface of the titanium plate in turn to eliminate scratches on the surface of the titanium plate and increase the surface flatness of the titanium plate.

[0007] Furthermore, in the above-mentioned method for preparing large-sized laminated materials by semi-solid delayed solidification molding, in the feeding step, the feeding amount is set to 280 kg each time, and after reaching the set amount, the feeding screw stops rotating.

[0008] Furthermore, in the above-mentioned method for preparing large-sized laminated materials by semi-solid delayed solidification molding, in the feeding step, the rotation speed of the spiral shearing conveying rod driven by the rotary driving mechanism is set to 100 r / min.

[0009] Furthermore, in the above-mentioned method for preparing large-scale laminated materials by semi-solid delayed solidification molding, in the die-casting molding step, the holding pressure is set to 200 MPa.

[0010] Furthermore, in the above method for preparing large-scale laminated materials by semi-solid delayed solidification molding, a cleaning step is also included after the demoulding step: cleaning the aluminum-titanium laminated composite material with anhydrous ethanol and drying it after cleaning.

[0011] Compared with the prior art, the method of preparing large-scale laminated materials by semi-solid delayed solidification molding of the present invention has the following advantages and beneficial effects: The method for preparing large-scale laminated materials by semi-solid delayed solidification molding provided by the present invention is aimed at the technical status quo that large-scale aluminum-titanium laminated composite materials are difficult to prepare, defects are easily introduced at heterogeneous interfaces, and the interface bonding strength is low. The aluminum-titanium laminated composite material is prepared by a semi-solid delayed solidification molding process using aluminum and titanium as raw materials, and undergoing surface treatment, pre-setting titanium plates, preheating barrels and molds, adding materials, feeding, die-casting, delayed solidification annealing and other steps. The process is advanced, the process is strict, and the production efficiency is high. The preparation difficulties of large-scale aluminum-titanium laminated composite materials in the prior art are solved. An obvious interface bonding layer is formed between the titanium layer and the aluminum layer of the prepared aluminum-titanium laminated composite material, which has no defects such as pores and cracks, good heterogeneous interface bonding, high bonding strength, and obvious technical advantages and process advancement. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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 those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings: Figure 1 A schematic structural diagram of a semi-solid delayed solidification die-casting molding device used in the method for preparing a large-sized laminated material by semi-solid delayed solidification molding of the present invention; Figure 2 for Figure 1 The material state diagram inside the mold cavity of the semi-solid delayed solidification die casting equipment shown; Figure 3 The interface microstructure diagram of the aluminum-titanium laminated composite material prepared by the method for preparing a large-scale laminated material by semi-solid delayed solidification molding of the present invention is shown; Figure 4 The result of the interface energy spectrum detection of the aluminum-titanium laminated composite material prepared by the method of preparing large-scale laminated materials by semi-solid delayed solidification molding of the present invention is shown.

[0013] Description of reference numerals: 1-aluminum particles, 2-storage funnel, 3-feeding funnel, 4-feeding screw, 5-feeding channel, 6-semi-solid section heater, 7-melting section heater, 8-die casting preparation area heater, 9-injection area heater, 10-rotation drive mechanism, 11-hydraulic transmission rod, 12-barrel, 13-spiral shearing conveying rod, 14-heating sleeve, 15-injection punch, 16-injection storage area, 17-discharge joint, 18-main channel, 19-mold cavity, 20-mold, 21-heat transfer oil injection pipe, 22-heat transfer oil return pipe, 23-mold temperature controller, 24-titanium plate, 25-fixed mold, 26-movable mold, 27-aluminum liquid. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding 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 work are within the scope of protection of the present invention.

[0015] like Figure 1 and Figure 2As shown, the semi-solid delayed solidification die-casting molding equipment used in the method for preparing large-size laminated materials by semi-solid delayed solidification molding provided by the present invention includes: a storage funnel 2, a feeding funnel 3, a feeding screw 4, a feeding channel 5, a semi-solid section heater 6, a melting section heater 7, a die-casting preparation area heater 8, an injection area heater 9, a rotary drive mechanism 10, a hydraulic transmission rod 11, a barrel 12, a spiral shearing conveying rod 13, a heating sleeve 14, an injection punch 15, an injection storage area 16, a discharge joint 17, a main channel 18, a mold cavity 19, a mold 20, a heat transfer oil injection pipe 21, a heat transfer oil return pipe 22, a mold temperature controller 23, a fixed mold 25, and a movable mold 26.

[0016] The storage hopper 2, the feeding hopper 3, and the feeding channel 5 are connected in sequence and communicate with each other. The feeding screw 4 is arranged in the feeding hopper 3, and the discharge port of the feeding channel 5 is communicated with the feeding end of the barrel 12. The spiral shearing conveying rod 13 is arranged inside the barrel 12, and the injection punch 15 is arranged in the barrel 12 near the discharge end. The rotary drive mechanism 10 and the hydraulic transmission rod 11 are arranged on one side of the feeding end of the barrel 12. The rotary drive mechanism 10 is used to drive the spiral shearing conveying rod 13, and the hydraulic transmission rod 12 is used to drive the injection punch 15.

[0017] From the feeding end to the discharging end, the barrel 12 is divided into a semi-solidification zone, a melting zone, a die casting preparation zone, and an injection zone, and the injection storage zone 16 is arranged in the injection zone of the barrel 12 and is located at the port position of the discharging end of the barrel 12. The heating sleeve 14 is sleeved on the outer periphery of the barrel 12, and the semi-solid zone heater 6, the melting zone heater 7, the die casting preparation zone heater 8, and the injection zone heater 9 are coated on the outer periphery of the heating sleeve 14, and the semi-solid zone heater 6, the melting zone heater 7, the die casting preparation zone heater 8, and the injection zone heater 9 are arranged at positions corresponding to the semi-solidification zone, the melting zone, the die casting preparation zone, and the injection zone of the barrel 12, respectively.

[0018] The discharge connector 17 is arranged on one side of the discharge end of the barrel 12, one end of the main channel 18 is connected to the barrel 12 via the discharge connector 17, and the other end of the main channel 18 is connected to the mold cavity 19 of the mold 20. The mold 20 includes a fixed mold 25 and a movable mold 26. The mold temperature controller 23 is connected to the mold 20 via a heat transfer oil injection pipe 21 and a heat transfer oil return pipe 22. The heat transfer oil enters the mold 20 through the heat transfer oil injection pipe 21 and flows back to the mold temperature controller 23 through the heat transfer oil return pipe 22, forming a heat transfer oil circuit to heat the mold 20.

[0019] The method for preparing large-scale laminated materials by semi-solid delayed solidification molding of the present invention comprises the following steps: (1) Surface treatment of titanium plate The titanium plate is subjected to surface corrosion treatment, cleaning and polishing, specifically including: using hydrofluoric acid to corrode the surface of the titanium plate to remove oxides on the surface of the titanium plate; using anhydrous ethanol to clean the corroded surface of the titanium plate to wash away the hydrofluoric acid and impurities; selecting 200-grit sandpaper to polish the surface of the titanium plate to quickly eliminate the residual impurity layer on the surface of the titanium plate; selecting 400-grit and 800-grit sandpaper respectively, and polishing the surface of the titanium plate in turn to eliminate scratches on the surface of the titanium plate and increase the surface flatness of the titanium plate.

[0020] (2) Pre-set titanium plate According to the size specifications of the mold cavity 19, the surface treated titanium plate is cut into two titanium plates 24, and the two titanium plates 24 are respectively pre-fixed on the cavity walls of the fixed mold 25 and the movable mold 26, and then the movable mold 26 and the fixed mold 25 are molded together. Figure 2 The length and width of each titanium plate 24 match the length and width of the mold cavity 19, and the relationship between the thickness of each titanium plate 24 and the depth of the mold cavity 19 satisfies: B=2A / 3, B is the thickness of the titanium plate 24, 2A is the depth of the mold cavity 19, and the depths of the cavity parts in the fixed mold 25 and the movable mold 26 are A respectively. Thus, a gap with a depth of B (=2A-2B=2A-2×2A / 3=2A / 3) is left between the two titanium plates 24 in the mold cavity 19, that is, in the direction of the mold cavity 19, the two titanium plates 24 and the gap between them each occupy 1 / 3 of the mold cavity 19.

[0021] For example, in a specific embodiment, the mold cavity 19 is a rectangular cavity structure, and its length, width and depth are 1000mm, 1000mm and 30mm respectively, that is, 2A=30mm, and the depth of the parts of the mold cavity 19 in the fixed mold 25 and the movable mold 26 is A=15mm. According to the above-mentioned dimensions of the mold cavity 19, the length and width of the two titanium plates 24 cut are 1000mm and 1000mm respectively, and the thickness is B=2A / 3=10mm. Therefore, the dimensions of the two titanium plates 24 and the gap between them in the depth direction of the mold cavity 19 are both 10mm.

[0022] (3) Preheat the barrel and mold The barrel 12 is preheated through the semi-solid zone heater 6, the melting zone heater 7, the die-casting preparation zone heater 8, the injection zone heater 9 and the heating sleeve 14; the mold temperature controller 23 is turned on, and the heat transfer oil enters the mold 20 through the heat transfer oil injection pipe 21 and returns to the mold temperature controller 23 through the heat transfer oil return pipe 22, forming a heat transfer oil circuit to preheat the mold 20.

[0023] In a specific embodiment, the heating temperature of the semi-solid zone heater 6 is set to 580°C, the heating temperature of the melting zone heater 7 is set to 660°C, the heating temperature of the die casting preparation zone heater 8 is set to 680°C, and the heating temperature of the injection zone heater 9 is set to 700°C; the heating temperature of the mold temperature controller 23 is set to 660°C.

[0024] (4) Adding materials Aluminum particles 1 are poured into the storage funnel 2, and flow quantitatively into the feeding funnel 3 through the conical outlet of the storage funnel 3. The feeding screw 4 in the feeding funnel 3 rotates to continuously feed the aluminum particles 1 through the feeding channel 5 into the barrel 12 with a spiral shearing conveying rod 13 built in.

[0025] In a specific embodiment, the feeding amount is set to 280 kg each time, and after reaching the set amount, the feeding screw 4 stops rotating.

[0026] (5) Feeding The rotary drive mechanism 10 drives the spiral shearing conveying rod 13 to rotate. The rotation of the spiral shearing conveying rod 13 conveys the aluminum particles 1 toward the discharge end of the barrel 12 (i.e., the direction of the mold 20), and at the same time applies shear force to the aluminum particles 1. During the conveying process, the aluminum particles 1 first pass through the semi-solidification zone of the barrel 12. Under the combined action of the heating of the semi-solid zone heater 6 and the shearing of the spiral shearing conveying rod 13, the aluminum particles 1 form semi-solid aluminum slurry, and then the semi-solid aluminum slurry passes through the melting zone of the barrel 12. The solid particles in the semi-solid aluminum slurry are further melted by the melting zone heater 7 to form aluminum liquid. The aluminum liquid is transmitted by the spiral shearing conveying rod 13, passes through the die-casting preparation zone of the barrel 12, and enters the injection zone, and is further heated by the die-casting preparation zone heater 8 and the injection zone heater 9. Finally, the aluminum liquid is conveyed to the injection storage area 16 located at the discharge end port of the barrel 12.

[0027] In a specific embodiment, the rotation speed of the spiral shearing conveying rod 13 driven by the rotary drive mechanism 10 is set to 100 r / min.

[0028] (6) Die casting The hydraulic transmission rod 12 pushes the injection punch 15 to press the aluminum liquid in the injection storage area 16 into the gap between the two titanium plates 24 inside the mold cavity 19 through the main channel 18. After the gap is filled with aluminum liquid 27, the injection punch 15 continues to apply pressure to the aluminum liquid 27 to maintain the pressure under the pushing action of the hydraulic transmission rod 12.

[0029] In a specific embodiment, the holding pressure is set to 200 MPa.

[0030] (7) Delayed solidification annealing The holding pressure is adjusted to 0.5 MPa, and the set heating temperature of the mold temperature controller 23 is lowered to 600°C. The mold 20 is kept warm for 90 minutes to delay the solidification of the aluminum liquid 27 in the mold cavity 19. At the same time, the aluminum liquid 27 and the titanium plate 24 are annealed to achieve aluminum-titanium interface bonding and form an aluminum-titanium laminated composite material casting.

[0031] (8) Demolding After the delayed solidification annealing is completed, the movable mold 26 is moved away from the fixed mold 25, the mold cavity 19 is opened, and the aluminum-titanium laminated composite material casting is demolded and taken out from the mold 20.

[0032] (9) Cleaning The aluminum-titanium laminated composite material is cleaned with anhydrous ethanol and then dried.

[0033] (10) Detection, analysis, and characterization The morphology, color, microstructure and interface bonding of the aluminum-titanium laminated composite materials were detected, analyzed and characterized. The interface of the aluminum-titanium laminated composite materials was analyzed by field emission scanning electron microscopy, and the elemental composition of the interface diffusion layer products of the aluminum-titanium laminated composite materials was analyzed by energy dispersive X-ray spectrometer.

[0034] Figure 3 The interface microstructure diagram of the aluminum-titanium laminated composite material prepared by the method of preparing a large-scale laminated material by semi-solid delayed solidification molding of the present invention is shown, as shown in FIG. Figure 3 As shown, no obvious pores or cracks were found at the interface of the aluminum-titanium laminated composite material, indicating that the aluminum layer and the titanium layer were well bonded. An obvious diffusion layer was seen at the aluminum-titanium interface, confirming the good interface bonding between the titanium layer and the aluminum layer.

[0035] Figure 4 The result of the interface energy spectrum detection of the aluminum-titanium laminated composite material prepared by the method of preparing a large-scale laminated material by semi-solid delayed solidification molding of the present invention is shown in FIG. Figure 4 As shown, the elements of the interface diffusion layer of the aluminum-titanium laminated composite material mainly include titanium and aluminum, confirming that an annealing reaction occurs between the heterogeneous layers of aluminum and titanium.

[0036] In summary, the method for preparing large-scale laminated materials by semi-solid delayed solidification molding provided by the present invention is aimed at the current technical status that large-scale aluminum-titanium laminated composite materials are difficult to prepare, defects are easily introduced at heterogeneous interfaces, and the interface bonding strength is low. The aluminum-titanium laminated composite materials are prepared by semi-solid delayed solidification molding process using aluminum and titanium as raw materials, and undergoing surface treatment, pre-setting titanium plates, preheating barrels and molds, adding materials, feeding, die-casting, delayed solidification annealing and other steps. The process is advanced, the process is strict, and the production efficiency is high. The preparation difficulties of large-scale aluminum-titanium laminated composite materials in the prior art are solved. The prepared aluminum-titanium laminated composite materials form a clear interface bonding layer between the titanium layer and the aluminum layer, without defects such as pores and cracks, and the heterogeneous interface is well bonded and has high bonding strength. It has obvious technical advantages and advanced process.

[0037] It should be noted that, in this article, unless otherwise clearly specified and limited, the term "connection" or its synonyms should be understood in a broad sense. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing large-scale laminated materials by semi-solid delayed solidification molding, characterized in that: Aluminum and titanium are used as raw materials, and semi-solid delayed solidification die-casting molding equipment is used to prepare aluminum-titanium laminated composite materials through surface treatment, pre-setting titanium plates, preheating barrels and molds, adding materials, feeding, die-casting, and delayed solidification annealing. The semi-solid delayed solidification die-casting molding equipment includes: a storage funnel, a feeding funnel, a feeding screw, a feeding channel, a semi-solid section heater, a melting section heater, a die-casting preparation area heater, a shot zone heater, a rotary drive mechanism, a hydraulic transmission rod, a barrel, a screw A rotary shearing conveying rod, a heating sleeve, an injection punch, an injection storage area, a discharge joint, a main channel, a mold cavity, a mold, a heat transfer oil injection pipe, a heat transfer oil return pipe, a mold temperature controller, a fixed mold, and a movable mold, wherein a storage funnel, a feeding funnel, and a feeding channel are sequentially connected and interconnected, a feeding screw is arranged in the feeding funnel, and a discharge port of the feeding channel is connected to the feed end of the barrel; the spiral shearing conveying rod is arranged inside the barrel, and the injection punch is arranged in the barrel near the discharge end, and the rotary The driving mechanism and the hydraulic transmission rod are arranged on one side of the feeding end of the barrel, the rotary driving mechanism is used to drive the spiral shearing conveying rod, and the hydraulic transmission rod is used to drive the injection punch; from the feeding end to the discharging end, the barrel is divided into a semi-solid zone, a melting zone, a die-casting preparation zone, and an injection zone, and the injection storage zone is arranged in the injection zone and located at the discharge end port of the barrel; the heating sleeve is sleeved on the outer periphery of the barrel, and the semi-solid zone heater, the melting zone heater, the die-casting preparation zone heater, and the injection zone heater are coated on the outer periphery of the heating sleeve, and the setting positions of the semi-solid zone heater, the melting zone heater, the die-casting preparation zone heater, and the injection zone heater correspond to the semi-solid zone, the melting zone, the die-casting preparation zone, and the injection zone of the barrel respectively; the discharging joint is arranged on one side of the discharging end of the barrel, one end of the main channel is connected to the barrel via the discharging joint, and the other end of the main channel is connected to the mold cavity of the mold, the mold includes a fixed mold and a movable mold, and the mold temperature controller is connected to the mold via a heat transfer oil injection pipe and a heat transfer oil return pipe; The method for preparing large-scale laminated materials by semi-solid delayed solidification molding comprises the following steps: (1) Surface treatment of titanium plate Perform surface corrosion treatment, cleaning and polishing on the titanium plate to remove oxides and impurities on the titanium plate surface, eliminate scratches on the titanium plate surface, and increase the surface flatness of the titanium plate; (2) Pre-set titanium plate According to the size of the mold cavity, the surface-treated titanium plate is cut into two titanium plates, and the two titanium plates are respectively pre-fixed on the cavity walls of the fixed mold and the movable mold, and then the movable mold and the fixed mold are molded together, wherein the length and width of each titanium plate match the length and width of the mold cavity, and the relationship between the thickness of each titanium plate and the depth of the mold cavity satisfies: B=2A / 3, B is the thickness of the titanium plate, 2A is the depth of the mold cavity, wherein the depth of the cavity part in the fixed mold and the movable mold is A respectively; (3) Preheat the barrel and mold The barrel is preheated through the semi-solid zone heater, the melting zone heater, the die casting preparation zone heater, the injection zone heater and the heating sleeve, and the mold temperature controller is turned on to preheat the mold, wherein the heating temperature of the semi-solid zone heater is set to 580°C, the heating temperature of the melting zone heater is set to 660°C, the heating temperature of the die casting preparation zone heater is set to 680°C, the heating temperature of the injection zone heater is set to 700°C, and the heating temperature of the mold temperature controller is set to 660°C; (4) Adding materials Aluminum particles are poured into the storage funnel, and the aluminum particles flow quantitatively into the feeding funnel through the conical outlet of the storage funnel. The feeding screw in the feeding funnel rotates to continuously feed the aluminum particles into the barrel through the feeding channel; (5) Feeding The rotary drive mechanism drives the spiral shearing conveying rod to rotate. The rotation of the spiral shearing conveying rod conveys the aluminum particles toward the discharge end of the barrel, and at the same time applies shear force to the aluminum particles. During the conveying process, the aluminum particles first pass through the semi-solidification zone of the barrel. Under the combined action of the heating of the semi-solid zone heater and the shearing of the spiral shearing conveying rod, the aluminum particles form semi-solid aluminum slurry. Then the semi-solid aluminum slurry passes through the melting zone of the barrel. The solid particles in the semi-solid aluminum slurry are further melted by the melting zone heater to form aluminum liquid. The aluminum liquid is transmitted by the spiral shearing conveying rod, passes through the die-casting preparation zone of the barrel, and enters the injection zone. It is further heated by the die-casting preparation zone heater and the injection zone heater. Finally, the aluminum liquid is conveyed to the injection storage area located at the discharge end of the barrel. (6) Die casting The hydraulic transmission rod pushes the injection punch to press the aluminum liquid in the injection storage area into the gap between the two titanium plates inside the mold cavity through the main channel. After the gap is filled with aluminum liquid, the injection punch continues to apply pressure to the aluminum liquid to maintain the pressure under the push of the hydraulic transmission rod; (7) Delayed solidification annealing The holding pressure was adjusted to 0.5 MPa, and the set heating temperature of the mold temperature controller was lowered to 600°C. The mold was kept warm for 90 minutes to delay the solidification of the aluminum liquid in the mold cavity. At the same time, the aluminum liquid and the titanium plate were annealed to achieve aluminum-titanium interface bonding and form an aluminum-titanium laminated composite casting. (8) Demolding After the delayed solidification annealing is completed, the movable mold is moved away from the fixed mold, the mold cavity is opened, and the aluminum-titanium laminated composite material casting is demolded and taken out of the mold.

2. The method for preparing large-scale laminated materials by semi-solid delayed solidification molding according to claim 1, characterized in that: The steps of titanium plate surface treatment specifically include: using hydrofluoric acid to corrode the surface of the titanium plate to remove oxides on the surface of the titanium plate; using anhydrous ethanol to clean the corroded surface of the titanium plate to wash away the hydrofluoric acid and impurities; selecting 200-grit sandpaper to polish the surface of the titanium plate to quickly eliminate the residual impurity layer on the surface of the titanium plate; selecting 400-grit and 800-grit sandpaper respectively, and polishing the surface of the titanium plate in turn to eliminate scratches on the surface of the titanium plate and increase the surface flatness of the titanium plate.

3. The method for preparing large-scale laminated materials by semi-solid delayed solidification molding according to claim 1, characterized in that: In the feeding step, the feeding amount is set to 280 kg each time. After reaching the set amount, the feeding screw stops rotating.

4. The method for preparing large-scale laminated materials by semi-solid delayed solidification molding according to claim 1, characterized in that: In the feeding step, the rotation speed of the spiral shearing conveying rod driven by the rotary drive mechanism is set to 100 r / min.

5. The method for preparing large-scale laminated materials by semi-solid delayed solidification molding according to claim 1, characterized in that: In the die casting step, the holding pressure was set to 200 MPa.

6. The method for preparing large-scale laminated materials by semi-solid delayed solidification molding according to any one of claims 1 to 5, characterized in that: The demoulding step also includes a cleaning step: cleaning the aluminum-titanium laminated composite material with anhydrous ethanol and drying it after cleaning.

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