CN117182473A - Method for manufacturing intermetallic compound thin-wall part - Google Patents
Method for manufacturing intermetallic compound thin-wall part Download PDFInfo
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- CN117182473A CN117182473A CN202311267908.4A CN202311267908A CN117182473A CN 117182473 A CN117182473 A CN 117182473A CN 202311267908 A CN202311267908 A CN 202311267908A CN 117182473 A CN117182473 A CN 117182473A
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 229910000765 intermetallic Inorganic materials 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000002131 composite material Substances 0.000 claims abstract description 71
- 239000000463 material Substances 0.000 claims abstract description 44
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 32
- 239000011888 foil Substances 0.000 claims abstract description 25
- 229910010038 TiAl Inorganic materials 0.000 claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 17
- 238000009792 diffusion process Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 9
- 239000002905 metal composite material Substances 0.000 claims abstract description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 238000005098 hot rolling Methods 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 17
- 238000003825 pressing Methods 0.000 claims description 15
- 239000010936 titanium Substances 0.000 claims description 13
- 230000000750 progressive effect Effects 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 239000010439 graphite Substances 0.000 claims description 8
- 229910002804 graphite Inorganic materials 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 8
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 7
- 229910017604 nitric acid Inorganic materials 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000011065 in-situ storage Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
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- 238000005265 energy consumption Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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Abstract
The application belongs to the field of manufacturing of metal thin-wall parts, and relates to a method for manufacturing an intermetallic compound thin-wall part, which comprises the steps of alternately stacking Al and Ti pure metal foils, and preparing an Al and Ti pure metal composite sheet by hot rolling; then forming the composite sheet into the shape of a thin-wall part through an incremental forming process; and then, using 50-200A current to heat the material locally in a self-resistance way, combining a tool to apply pressure, so that pure metal Al and Ti in the composite sheet are subjected to diffusion reaction at high temperature and high pressure, the material of the part is converted into TiAl intermetallic compound from the pure metal, and further, the preparation of the thin-wall part of the TiAl intermetallic compound is realized. The method utilizes the characteristics of high plasticity and low strength of the metal foil composite sheet to realize the rapid low-cost development of the thin-wall part; the pressure and temperature are precisely controlled in the self-resistance heating process, and the diffusion reaction of the material is uniform and controllable, so that the pure metal composite sheet becomes a high-strength heat-resistant TiAl intermetallic compound.
Description
Technical Field
The application belongs to the field of manufacturing of metal thin-wall parts, and particularly relates to a method for manufacturing an intermetallic compound thin-wall part.
Background
Aircraft designs typically employ low density and high modulus materials to reduce structural weight and improve flight performance. With the development of science and technology, the surface temperature of the outer skin thin-wall piece can reach 800 ℃ when the supersonic aircraft and the aerospace aircraft are used. The high temperature resistance and strength of the TiAl intermetallic compound are far higher than those of aluminum alloy, the elastic modulus and density are superior to those of titanium alloy, the temperature resistance can reach 850 ℃, and the TiAl intermetallic compound becomes an excellent alternative material for the thin-wall parts of high-speed aircrafts. However, the intermetallic compound has poor strength and plasticity, and the thin-walled part blank is difficult to prepare and shape, so that the application of the intermetallic compound thin-walled part is limited.
Disclosure of Invention
The purpose of the application is that: the method for manufacturing the thin-wall intermetallic compound part solves the problems that the thin-wall intermetallic compound part with the thickness of less than 3mm is difficult to form, long in production period, high in cost and the like.
In order to solve the technical problem, the technical scheme of the application is as follows:
a method for manufacturing an intermetallic compound thin-wall part comprises the following processing steps:
firstly, alternately stacking pure Al and pure Ti metal foils with the thickness of 0.05-0.3 mm, and preparing an Al and Ti pure metal composite sheet by hot rolling; then, forming the composite sheet into the shape of a thin-wall part through an incremental forming process; then using 50-200A current to heat the material locally in a self-resistance way, combining 100-1000N pressure applied by an insulating tool to make pure metal Al and Ti in the composite sheet perform diffusion reaction at high temperature and high pressure, and converting the material of the part from pure metal into TiAl intermetallic compound, thereby realizing the preparation of the thin-wall part of the TiAl intermetallic compound;
in high temperature and high pressure, the temperature range is 900-1200 ℃ and the pressure range is 35-64 MPa; the insulation tool pressure (P) can be determined byObtained, where F is the pressure exerted by the insulating tool, α is the part forming angle, R is the insulating tool radius, contact area s=pi (R 2 -(R-F 0.4 /100) 2 ). Temperature->Wherein I is current, and t is the thickness of the metal composite sheet.
When pure metals Al and Ti undergo diffusion reaction at high temperature and high pressure, when the temperature and the pressure are too high, the excessive temperature and the pressure can cause Al to flow and dissipate due to the difference of the strength and the melting point of Al and Ti materials; too low a temperature may result in incomplete diffusion, and therefore, the diffusion temperature needs to be controlled to 900-1200 ℃; too low a pressure may also cause defects such as voids, porosity, etc. to form in the Al layer due to atom movement. Thus, the temperature and pressure parameter combinations are typically controlled during process implementations
The tensile strength of the pure metal composite sheet of Al and Ti is 215MPa, the elongation is 30%, the tensile strength of the TiAl intermetallic compound reaches more than 1200MPa, the elongation is only 0.3-4%, the forming is difficult, and the rebound is larger after the forming of the part due to the high strength. In the process, the characteristics of low strength and good plasticity of the pure metal composite sheet material are utilized, and the rapid low-cost forming of the thin-wall piece with the thickness of less than 3mm is realized under the condition of no die by progressive forming; and aiming at the formed part, carrying out diffusion migration on Al and Ti atoms under the in-situ local thermal coupling effect, and carrying out mutual diffusion between pure metal layers, so that the pure metal layers are converted into alloy layers consisting of Al and Ti, and thus the TiAl intermetallic compound is formed. Compared with the direct forming of the TiAl intermetallic compound, the technical difficulty that the TiAl intermetallic compound is poor in plasticity and difficult to form is solved through the process flow, and the rebound deformation of the thin-wall part and the energy consumption caused by the forming of the high-strength material are reduced.
Specifically, the method of the application comprises the following processing steps:
alternately stacking pure aluminum and pure titanium foil to form a blank, wherein the thickness of the foil is 0.05-0.3 mm; setting rolling parameters: the initial temperature of the blank is 450-530 ℃, the diameter of a roller is 200-600 mm, the rolling speed is 2-5 m/min, and the blank is manufactured into a composite sheet by rolling; the thickness of the composite thin plate is below 3mm;
in order to enable pure aluminum and pure titanium to be combined together through rolling, the conditions that the pure aluminum layer extrudes or forms a hard and brittle impurity phase on an interface due to the fact that the temperature is too high are avoided, and the initial temperature of a blank adopts the temperature in the range: 450-530 ℃.
Step two, selecting the diameter of a forming tool according to the thickness of the material, generating a forming track based on the shape of the part, covering the backing plates on the upper surface and the lower surface of the composite sheet, and preparing the shape of the part from the composite sheet through progressive forming; the backing plate is used for sealing the composite sheet, so that the forming tool can be prevented from directly contacting the material to scratch the surface of the part, and oxidation of the material can be prevented during subsequent heating.
The diameter range of the forming tool is 10-30 mm, and the relation between the diameter of the tool and the thickness of the material is: d/t is more than or equal to 10, and D is the diameter of the forming tool.
The progressive forming process parameters are set as follows: the track line spacing range is 0.1-1.5 mm, and the forming speed is 1000-5000 mm/min;
step three, replacing a force control insulating tool, setting track parameters such as row spacing, feeding speed, track repetition number and the like, setting pressing force and current parameters of the insulating tool, switching on a direct current power supply of the insulating tool and contacting a backing plate, forming a current loop by current passing through the composite thin plate, generating heat due to self resistance of the composite thin plate, forming high temperature of 900-1200 ℃ by self resistance heating of the composite thin plate, and applying pressure by the insulating tool to enable the composite thin plate to form intermetallic compounds under high temperature and high pressure.
The parameters in the third step are set as follows: the line spacing range is 0.1-1 mm, the feeding speed range is 100-1000 mm/min, the track repetition number is 2-10, the insulation tool pressing force range is 100-1000N, and the current range is 50-200A.
The diffusion effect is related to the high temperature and pressure and the action time. In high temperature and high pressure, the temperature range is: 900-1200 ℃, the pressure range is: 35-64 MPa. The pressure is mainly related to the insulation tool applied pressure (F), and the part forming angle (α) and the contact area (S), the pressure-to-pressure relationship p=fcos α/S, the contact area S is related to the pressure (F) and the insulation tool radius (R), i.e. s=pi (R) 2 -(R-F 0.4 /100) 2 ). Under the conditions that the diameter range of the tool head is 20-30 mm and the forming angle is 0-45 degrees, the pressing force range of the insulating tool is 100-1000N according to the relation between pressure intensity and pressure; the temperature is related to the current (I), the thickness (t) of the composite sheet and the contact area (S), according to the relationThe current range is 50-200A. The heating time is related to the contact area S, the line spacing L, the feed speed v and the track repetition number N, the contact time +.>To ensure the diffusion effect, the contact time t c >1s, for this purpose, the line spacing is in the range of 0.1 to 1mm, the feed speed is in the range of 100 to 1000mm/min, and the number of track repetitions is 2 to 10.
The backing plate is a steel plate with the thickness of 0.5-1.0 mm. The backing plate is made of steel plates, and the composite thin plate is extruded and damaged due to overlarge deformation resistance, and the backing plate is too thin and can be damaged in the forming process, so that the thickness of the backing plate is usually 0.5-1.0 mm for forming the composite thin plate below 3 mm.
The force control insulating tool realizes the insulation between the tool and equipment such as double-sided numerical control incremental forming special equipment or a double-robot system and the like through a ceramic shaft sleeve of a tool handle.
The type of the force control insulating tool is a fixed ball type or a rolling disc type, the diameter range of the tool head is 20-30 mm, and the material is hard alloy.
The force control mode in the force control insulating tool comprises a pneumatic system, a hydraulic system, an electric push rod and other control modes.
And in the second step, the backing plate is arranged on two sides of the composite sheet plate, graphite is smeared between the composite sheet and the backing plate, the composite sheet and the backing plate are prevented from being connected together in a diffusion way, and meanwhile, the conductivity between the composite sheet and the backing plate is maintained, so that the self-resistance heating of the material is met. The edges of the two layers of backing plates are welded together and air between the backing plates is pumped to form a vacuum environment of 0.001-0.0001 MPa. By placing the backing plate, the composite sheet is in a vacuum state in the self-resistance heating process, high-temperature oxidation is avoided, and the forming tool is prevented from directly contacting the composite sheet in the progressive forming process, so that surface scratches of the composite sheet are avoided.
Before stacking the foils in the first step, cleaning surface stains, and then corroding the materials by using nitric acid solution to passivate the surfaces of the materials.
And in the second step, the forming tool is made of hard alloy or bearing steel.
And in the second step, the incremental forming equipment adopts double-sided numerical control incremental forming equipment or a double-robot system.
The purity of the Al and Ti pure metal foil is over 99.99 percent.
In the third step, the DC power supply is a safe voltage of 36V.
In particular, the thickness of the intermetallic compound thin-wall piece prepared by the method is below 3 mm.
The beneficial effects of the application are as follows:
1. intermetallic materials have high strength and poor formability, while pure metallic materials have excellent forming limits and lower strength compared to alloys. According to the application, the TiAl intermetallic compound is formed by firstly forming the pure metal lamellar composite sheet and then forming the TiAl intermetallic compound at high temperature and high pressure, so that the problems of difficult forming and high deformation resistance of the intermetallic compound are avoided, and the energy consumption and the die consumption caused by forming the intermetallic compound are effectively reduced.
2. According to the application, flexible forming of the complex shape of the part and in-situ preparation of the TiAl intermetallic compound are realized through progressive forming equipment, and compared with the traditional die forming mode, the cost and period generated by die manufacturing can be effectively reduced.
3. According to the application, in the forming process, the backing plate is covered on the surface of the material, graphite is smeared between the material and the backing plate, and a vacuum environment is formed through the backing plate, so that the problem of oxidation on the surface of the material can be avoided when the TiAl intermetallic compound is formed by the pure metal layered composite sheet at high temperature and high pressure.
Drawings
FIG. 1 is a process flow diagram of a method for manufacturing an intermetallic thin-walled member according to the present application;
FIG. 2 is a schematic illustration of a composite sheet stack according to the present application;
FIG. 3 is a schematic representation of the rolling of a composite sheet according to the present application;
FIG. 4 is a schematic illustration of the placement of a composite sheet pallet of the present application;
FIG. 5 is a schematic illustration of the progressive forming process of the present application;
FIG. 6 is a schematic illustration of in situ localized heating using a fixed ball type insulating tool;
FIG. 7 is a schematic illustration of formation of TiAl intermetallic compounds in the present application;
FIG. 8 is a composite sheet microstructure in accordance with example one;
FIG. 9 is a physical view of the parts prepared in example one;
FIG. 10 is a microstructure of the composite sheet of example one with too little pressure resulting in porosity;
FIG. 11 is a graph of tissue and EDS results for an incomplete diffusion composite sheet of example one, wherein the left plot is tissue and the right plot is EDS results;
FIG. 12 is a fully diffused composite sheet microstructure in embodiment one;
fig. 13 is a schematic illustration of in situ localized heating using a rolling disc type insulating tool.
Wherein, 1, pure aluminum foil; 2. pure titanium foil; 3. a roller; 4. a composite sheet; 5. a backing plate; 6. edge pressing rings; 7. a progressive forming tool head; 8. an insulating fixed ball-shaped tool; 9. a direct current power supply; 10. thin plates of TiAl intermetallic compounds; 11. insulated rolling disc tool.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without making any inventive effort are intended to fall within the scope of the present application.
Features of various aspects of embodiments of the application are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the application. It will be apparent, however, to one skilled in the art that the present application may be practiced without these specific details. The following description of the embodiments is merely for a better understanding of the application by showing examples of the application. The present application is not limited to any particular arrangement and method provided below, but covers any modifications, substitutions, etc. of all product constructions, methods, and the like covered without departing from the spirit of the application.
Well-known structures and techniques have not been shown in detail in the various drawings and the following description in order not to unnecessarily obscure the present application.
A method of manufacturing an intermetallic compound thin-walled member according to the present application will be described in detail with reference to the accompanying drawings.
Fig. 1 is a flow chart of a method for manufacturing an intermetallic thin-walled member according to the present disclosure. With reference to fig. 2-7, the preparation method of the present application comprises the steps of:
s100, alternately stacking pure aluminum foil and pure titanium foil with certain thickness, setting rolling parameters such as initial temperature of blank, diameter of roller, rolling speed and the like, and manufacturing the material into a composite sheet by high-temperature rolling;
in the step S100, the thickness of the foil is 0.05-0.3 mm, surface stains need to be cleaned before the foil is stacked, and then nitric acid solution is used for corroding the material to passivate the surface of the material;
in the step S100, the initial temperature range of the blank is 450-530 ℃, the diameter range of the roller is 200-600 mm, and the rolling speed range is 2-5 m/min;
s200, designing incremental forming process parameters such as forming tool diameter, track row spacing, forming speed and the like based on the shape of the part, generating forming tracks, covering backing plates on the upper surface and the lower surface of the composite sheet, and preparing the shape of the part from the composite sheet by incremental forming on special equipment or a double-robot system for double-sided numerical control incremental forming;
in the step S200, the forming tool is made of hard alloy or bearing steel, the diameter range is 10-30 mm, the track row spacing range is 0.1-1.5 mm, and the forming speed is 1000-5000 mm/min;
in the step S200, the covering backing plate is generally a steel plate with better forming performance and lower price, the thickness is 0.5-1.0 mm, the backing plate is placed on two sides of the composite sheet material, graphite is smeared between the steel plate and the backing plate, the two layers of backing plates are welded together while keeping conductivity, and the edges of the two layers of backing plates are required to be welded together and air between the backing plates is extracted to form a vacuum environment of 0.001-0.0001 MPa;
s300, replacing a force control insulating tool, setting track parameters such as row spacing, feeding speed, track repetition number and the like, setting pressing force and current parameters of the insulating tool, switching on a 36V direct current power supply of the insulating tool and locally contacting a plate material, and enabling a part material to form an intermetallic compound at high temperature and high pressure through high temperature formed by self-resistance heating and applying pressure by the tool.
In step S300, the tool handle of the force control insulating tool realizes insulation between the tool handle and equipment such as double-sided numerical control incremental forming special equipment or a double-robot system and the like through a ceramic shaft sleeve, the type of the tool is a fixed ball type or a rolling disc type, the diameter range of the tool head is 20-30 mm, the material is hard alloy, and the force control mode comprises a pneumatic system, a hydraulic system, an electric push rod and other control modes;
in step S300, the line spacing is in the range of 0.1-1 mm, the feeding speed is in the range of 500-3000 mm/min, the track repetition number is 2-10 times, the insulation tool pressing force is in the range of 100-1000N, and the current is in the range of 50-200A.
The method of manufacturing the thin-walled pieces of intermetallic compounds of different thicknesses will be further described with reference to fig. 8 to 12.
Example 1
Step one, 6 layers of pure aluminum foil with the thickness of 0.2mm and 5 layers of pure titanium foil with the thickness of 0.2mm are washed by clean water, then the surfaces of the pure aluminum foil and the pure titanium foil are corroded by 0.1% nitric acid solution, and the pure aluminum foil and the pure titanium foil are alternately stacked together to form a 2.2mm composite sheet. The composite sheet was heated to 530℃and rolled to 1.1mm using a rolling mill having a roll diameter of 300mm at a rolling speed of 3m/min, and the microstructure of the composite sheet was as shown in FIG. 8.
Generating a forming track based on the shape of the part, wherein the diameter of a forming tool is 30mm, the track row spacing is 1.5mm, and the forming speed is 5000mm/min. And before forming, coating graphite on two sides of the composite sheet. Experiments show that the composite sheet is extruded and damaged due to overlarge deformation resistance of the backing plate, the backing plate is too thin and can be damaged in the forming process, the DC04 deep-drawing steel plates with the thickness of 0.5 and 1.0mm can meet the test requirements, and the DC04 deep-drawing steel plates with the thickness of 0.5mm are selected as the backing plate to cover the two sides of the composite sheet.
The edges of the steel plates were welded together and the air between the steel plates was pumped to 0.001MPa by a vacuum pump. And placing the welded plate on an incremental forming machine tool, and fixing the plate through a blank holder. Further, a forming test was started, and a plate was formed into a design shape by a forming tool, and the shape of the formed part was as shown in fig. 9.
And thirdly, replacing a pneumatic control insulating fixed spherical tool with the diameter of 20mm, and generating a forming track based on the shape of the part, wherein the track row spacing is 1.0mm. When the tool pressure is too small, and the pressure is low, the Al layer forms defects such as holes, looseness and the like in the Al layer due to atom movement, as shown in FIG. 10; however, when the current is too small, the temperature is too low, or the contact time is too short, insufficient diffusion is caused, and the original pure aluminum layer forms Al 3 Ti, still a portion of Ti remained, as shown in fig. 11. Therefore, the tool pressing force is selected to be 100N, the direct-current power supply voltage is 36V, the current is 50A, and the setting is thatThe feed speed was 1000mm/min and the number of track repetitions was 5.
The part material is a uniform TiAl intermetallic compound, the section microstructure is shown in figure 12, the strength of the material reaches 1230MPa, which is far higher than 420MPa of pure metal Ti and 65MPa of pure Al, and the strength of the material is obviously improved.
Example 2
Step one, after 10 layers of pure aluminum foil with the thickness of 0.1mm and 9 layers of pure titanium foil with the thickness of 0.08mm are washed by clean water, the surfaces of the pure aluminum foil and the pure titanium foil are corroded by using 0.1% nitric acid solution, and the pure aluminum foil and the pure titanium foil are alternately stacked together to form a composite sheet with the thickness of 1.72 mm. The composite sheet was heated to 530℃and rolled to 1.0mm using a rolling mill having a roll diameter of 300mm at a rolling speed of 3 m/min.
Generating a forming track based on the shape of the part, wherein the diameter of a forming tool is 30mm, the track row spacing is 1.5mm, and the forming speed is 5000mm/min. Before forming, graphite is smeared on two sides of the composite sheet, and two DC04 deep-drawing steel plates with the thickness of 0.5mm are covered on the two sides of the composite sheet. The edges of the steel plates were welded together and the air between the steel plates was pumped to 0.001MPa by a vacuum pump. And placing the welded plate on an incremental forming machine tool, and fixing the plate through a blank holder. Further, a forming test was started, and the sheet was formed into a design shape by a forming tool.
Step three, replacing a pneumatic control insulating fixed spherical tool with the diameter of 20mm, and generating a forming track based on the shape of a part, wherein the track row spacing is 1.0mm, the tool pressing force is 100N, the direct-current power supply voltage is 36V, the current is 50A, the feeding speed is 1000mm/min, and the track repetition number is 5.
Example 3
Step one, after 20 layers of pure aluminum foil with the thickness of 0.05mm and 19 layers of pure titanium foil with the thickness of 0.05mm are washed by clean water, the surfaces of the pure aluminum foil and the pure titanium foil are corroded by using 0.1% nitric acid solution, and the pure aluminum foil and the pure titanium foil are alternately stacked together to form a composite sheet with the thickness of 1.95 mm. The composite sheet was heated to 500℃and rolled to 1.5mm using a rolling mill having a roll diameter of 250mm at a rolling speed of 2 m/min.
Generating a forming track based on the shape of the part, wherein the diameter of a forming tool is 10mm, the track row spacing is 0.1mm, and the forming speed is set to 3000mm/min. Before forming, graphite is smeared on two sides of the composite sheet, and two DC04 deep-drawing steel plates with the thickness of 1mm are covered on the two sides of the composite sheet. The edges of the steel plates were welded together and the air between the steel plates was evacuated to 0.0001MPa by a vacuum pump. And placing the welded plate on an incremental forming machine tool, and fixing the plate through a blank holder. Further, a forming test was started, and the sheet was formed into a design shape by a forming tool.
And step three, replacing a hydraulic control insulating rolling disc type tool with the diameter of 30mm, and generating a forming track based on the shape of the part, wherein the track row spacing is 0.3mm, the tool pressing force is 500N, the pulse direct current power supply voltage is 36V, the current is 120A, the feeding speed is 500mm/min, and the track repetition number is 10.
Example 4
Step one, after 10 layers of pure aluminum foil with the thickness of 0.3mm and 10 layers of pure titanium foil with the thickness of 0.3mm are washed by clean water, the surfaces of the pure aluminum foil and the pure titanium foil are corroded by using 0.1% nitric acid solution, and the pure aluminum foil and the pure titanium foil are alternately stacked together to form a 6.0mm composite sheet. The composite sheet was heated to 450℃and rolled to 3.0mm using a rolling mill having a roll diameter of 600mm at a rolling speed of 5 m/min.
Generating a forming track based on the shape of the part, wherein the diameter of a forming tool is 30mm, the track row spacing is 0.5mm, and the forming speed is set to be 1000mm/min. Before forming, graphite is smeared on two sides of the composite sheet, and two DC06 deep-drawing steel plates with the thickness of 0.5mm are covered on the two sides of the composite sheet. The edges of the steel plates were welded together and the air between the steel plates was pumped to 0.001MPa by a vacuum pump. And placing the welded plate on an incremental forming machine tool, and fixing the plate through a blank holder. Further, a forming test was started, and the sheet was formed into a design shape by a forming tool.
Step three, replacing an electric control insulating fixed ball with the diameter of 30mm, and generating a forming track based on the shape of the part, wherein the track row spacing is 0.1mm, the tool pressing force is 1000N, the direct current power supply voltage is 36V, the current is 200A, the feeding speed is 100mm/min, and the track repetition number is 2.
Any combination of the above optional solutions may be adopted to form an optional embodiment of the present application, which is not described herein. It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered in the scope of the present application.
Claims (10)
1. A method for manufacturing an intermetallic compound thin-wall part is characterized by comprising the following steps: firstly, alternately stacking pure Al and pure Ti metal foils with the thickness of 0.05-0.3 mm, and preparing an Al and Ti pure metal composite sheet by hot rolling; then, forming the composite sheet into the shape of a thin-wall part through an incremental forming process; then using 50-200A current to heat the material locally in a self-resistance way, combining 100-1000N pressure applied by an insulating tool to make pure metal Al and Ti in the composite sheet perform diffusion reaction at high temperature and high pressure, and converting the material of the part from pure metal into TiAl intermetallic compound, thereby realizing the preparation of the thin-wall part of the TiAl intermetallic compound;
in the high temperature and high pressure, the temperature range is 900-1200 ℃, and the pressure range is 35-64 MPa.
2. The method according to claim 1, characterized in that: the method comprises the following processing steps:
alternately stacking pure aluminum and pure titanium foil to form a blank, wherein the thickness of the foil is 0.05-0.3 mm; setting rolling parameters: the initial temperature of the blank is 450-530 ℃, the diameter of a roller is 200-600 mm, the rolling speed is 2-5 m/min, and the blank is manufactured into a composite sheet by rolling; the thickness of the composite thin plate is below 3mm;
step two, selecting the diameter of a forming tool according to the thickness of the material, generating a forming track based on the shape of the part, covering the backing plates on the upper surface and the lower surface of the composite sheet, and preparing the shape of the part from the composite sheet through progressive forming; the backing plate is used for sealing the composite sheet;
the diameter range of the forming tool is 10-30 mm, and the relation between the diameter of the tool and the thickness of the material is: d/t is more than or equal to 10, D is the diameter of the forming tool;
the progressive forming process parameters are as follows: the track line spacing range is 0.1-1.5 mm, and the forming speed is 1000-5000 mm/min;
step three, replacing a force control insulating tool, setting track parameters such as row spacing, feeding speed, track repetition number and the like, setting pressing force and current parameters of the insulating tool, switching on a direct current power supply of the insulating tool and contacting a backing plate, forming a current loop by current passing through the composite thin plate, generating heat due to self resistance of the composite thin plate, forming high temperature by self resistance heating of the composite thin plate, and applying pressure by the insulating tool to enable the composite thin plate to form intermetallic compounds under high temperature and high pressure.
3. The method according to claim 2, characterized in that: the parameters in the third step are set as follows: the line spacing range is 0.1-1 mm, the feeding speed range is 100-1000 mm/min, the track repetition number is 2-10, the insulation tool pressing force range is 100-1000N, and the current range is 50-200A.
4. The method according to claim 2, characterized in that: and in the second step, the backing plate is a steel plate with the thickness of 0.5-1.0 mm.
5. The method according to claim 2, characterized in that: the backing plate is placed on two sides of the composite sheet material, graphite is smeared between the composite sheet material and the backing plate, the composite sheet material and the backing plate are prevented from being connected together in a diffusion mode, and meanwhile conductivity between the composite sheet material and the backing plate is maintained, so that self-resistance heating of materials is met; the edges of the two layers of backing plates are welded together and air between the backing plates is pumped to form a vacuum environment of 0.001-0.0001 MPa.
6. The method according to claim 2, characterized in that: the type of the force control insulating tool is a fixed ball type or a rolling disc type, the diameter range of the tool head is 20-30 mm, and the material is hard alloy.
7. The method according to claim 2, characterized in that: the force control modes in the force control insulating tool comprise a pneumatic system, a hydraulic system, an electric push rod and other control modes.
8. The method according to claim 2, characterized in that: before stacking the foils, cleaning surface stains, and corroding the materials by using nitric acid solution to passivate the surfaces of the materials.
9. The method according to claim 2, characterized in that: and in the second step, the forming tool is made of hard alloy or bearing steel.
10. The method according to claim 2, characterized in that: and step two, the incremental forming equipment adopts double-sided numerical control incremental forming equipment or a double-robot system.
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| CN202311267908.4A CN117182473A (en) | 2023-09-27 | 2023-09-27 | Method for manufacturing intermetallic compound thin-wall part |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117817091A (en) * | 2024-03-04 | 2024-04-05 | 中国机械总院集团宁波智能机床研究院有限公司 | Preparation device and method of multi-interface composite material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117817091A (en) * | 2024-03-04 | 2024-04-05 | 中国机械总院集团宁波智能机床研究院有限公司 | Preparation device and method of multi-interface composite material |
| CN117817091B (en) * | 2024-03-04 | 2024-06-04 | 中国机械总院集团宁波智能机床研究院有限公司 | Preparation device and method of multi-interface composite material |
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