Manufacturing device and method applied to aluminum alloy / polytrifluorochloroethylene composite valve clack

Abstract

The invention relates to a manufacturing device and method applied to an aluminum alloy / polytrifluorochloroethylene composite valve clack. The device comprises a workbench (1); the clamping tool (2) is used for pressing and fixing the combined aluminum alloy / polytrifluorochloroethylene assembly on the workbench (1); the welding tool (3) is used for generating heat by friction with the aluminum alloy part; the temperature measuring tool is used for measuring the temperature of a to-be-connected surface area of the aluminum alloy part and the annular polytrifluorochloroethylene; and the force measuring tool is used for measuring the pressure of the welding tool (3) on the aluminum alloy part. Compared with the prior art, the method has the remarkable advantages that the process is simple and convenient, the device is convenient to disassemble and assemble, the welding efficiency is high, the interface bonding quality is excellent and the like, high-quality and high-efficiency preparation of the aluminum alloy / polytrifluorochloroethylene composite valve clacks with different complex shapes and sizes can be realized, and the method is suitable for connection requirements of metal / high polymer materials with various complex structures.

Description

Technical Field

[0001] The present invention relates to the technical field of valve flap manufacturing, and particularly to a manufacturing device and method for an aluminum alloy / polychlorotrifluoroethylene composite valve flap. Background Art

[0002] Metal / polymer composite structures can simultaneously exhibit the advantages of metals and polymer materials, possessing advantages that cannot be matched by single materials, and are widely used in fields such as aerospace, medical, and electronic communication. However, the difficulty in connecting metals and polymer materials lies in the significant differences in their physical and chemical properties, posing challenges for achieving high-quality connections. In addition, existing hot pressing connection methods are difficult to efficiently and stably meet the requirements of connecting complex structures, especially in complex application scenarios such as valves. To address these issues, new technologies need to be developed to overcome the deficiencies of mechanical connection, adhesive bonding, and hot pressing methods, such as additional weight, long time consumption, poor environmental friendliness, and low efficiency, and to achieve high-quality connection of complex structure metal / polymer materials through dedicated equipment, tools, and processes.

[0003] The welding method of metal and polymer is to heat the polymer material at the metal / polymer interface to melt it, and form a bond with the metal under the action of pressure. However, common welding methods have their limitations. For example, laser welding is prone to cause overheating and defect generation at the interface due to excessive heat input, while ultrasonic welding is mainly applicable to thin plate materials and is difficult to meet the connection requirements of complex structures. In contrast, the friction lap welding process based on frictional heat generation has become a potentially preferred solution for realizing metal / polymer connection in complex structures due to its simple operation, gentle heat input, and excellent controllability.

[0004] For the connection of simple structure metal / polymer, patent application CN109834383A discloses a method and device for friction lap spot welding of titanium alloy / ultra-high molecular weight polyethylene. This method realizes the connection of surface-designed titanium alloy and ultra-high molecular weight polyethylene through the friction lap welding method. Its welding tool is a solid cylinder, the rotational speed of the welding tool is between 500 rpm and 4000 rpm, and the downward pressing speed of the welding tool is between 0.5 mm / min and 6 mm / min. The porosity of the porous rough layer on the surface of the designed titanium alloy is between 20% and 90%, and the thickness of the surface porous rough layer is between 0.1 mm and 5 mm. This patent is a common case in the welding of metal and polymer flat structural parts.

[0005] Patent application CN117565301A discloses a preparation method for improving the interfacial properties of a composite structure of polychlorotrifluoroethylene and aluminum alloy. In this method, the surface of the aluminum alloy to be joined is successively subjected to sandblasting, sulfuric acid anodizing, and potassium dichromate sealing treatment, and then the connection between the aluminum alloy and polychlorotrifluoroethylene is achieved by means of a hot pressing process. The key parameters of the hot pressing process include a molding temperature of 230 - 250 °C, a molding pressure of 1 - 4 MPa, and a molding time of 15 - 90 min. Although this method can improve the interfacial properties to a certain extent, its process flow is complex, time-consuming, and the yield rate is relatively low, making it difficult to achieve high-quality and efficient connection between the aluminum alloy and polychlorotrifluoroethylene, which restricts the popularization of its practical application. Summary of the Invention

[0006] The object of the present invention is to provide a manufacturing device and method for an aluminum alloy / polychlorotrifluoroethylene composite valve flap to achieve high-quality direct connection between aluminum alloy with a complex structure and polychlorotrifluoroethylene.

[0007] The object of the present invention can be achieved through the following technical solutions: A manufacturing device for an aluminum alloy / polychlorotrifluoroethylene composite valve flap includes:

[0008] A workbench;

[0009] A clamping tool for tightly fixing the assembled aluminum alloy / polychlorotrifluoroethylene component on the workbench;

[0010] A welding tool for generating heat by friction with the aluminum alloy part;

[0011] A temperature measuring tool for measuring the temperature in the area of the connection surface between the aluminum alloy part and the annular polychlorotrifluoroethylene;

[0012] A force measuring tool for measuring the pressure of the welding tool on the aluminum alloy part.

[0013] Preferably, the clamping tool includes an upper clamping tool and a lower clamping tool;

[0014] The upper clamping tool is attached to and fixed on the workbench with the aluminum alloy part, and the lower clamping tool is attached to and fixed on the workbench with the annular polychlorotrifluoroethylene.

[0015] In the present invention, the clamping tool includes a bearing part and a pressing part. The clamping tool fixes the component to be welded in the working plane while retaining the axial freedom. On the one hand, it ensures that the aluminum alloy and polychlorotrifluoroethylene do not undergo horizontal displacement or deflection during the welding process, and on the other hand, it allows the aluminum alloy to move axially, thus completing the welding stably.

[0016] Further preferably, the upper clamping tool includes an annular structure, and the annular structure is attached to the surface of the aluminum alloy part and fixed on the workbench through bolts and other parts.

[0017] Further preferably, the annular structure is provided with an annular groove on the side close to the surface of the aluminum alloy part, so that both the upper surface and the outer surface of the aluminum alloy part are in contact with the annular structure.

[0018] Further preferably, the upper clamping tool applies a pre-tightening force to the aluminum alloy / polychlorotrifluoroethylene component.

[0019] In the present invention, the upper clamping tool applies a pre-tightening force to the aluminum alloy-polychlorotrifluoroethylene component to avoid situations that are not conducive to the smooth progress of the welding process, such as the rotation of the aluminum alloy part caused by excessive friction between the welding tool and the aluminum alloy part during the welding process. In order to prevent the aluminum alloy part from rotating, the pre-tightening force should not be too small. In the present invention, the upper clamping tool applies a pre-tightening force to the aluminum alloy-polychlorotrifluoroethylene component, which can ensure close contact between the aluminum alloy surface to be connected and the polychlorotrifluoroethylene. Since the elastic modulus of aluminum alloy is about 70 GPa and the elastic modulus of polychlorotrifluoroethylene is about 1300 MPa, the pre-tightening force should not cause structural damage to the materials to be welded. The actual pre-tightening force is determined according to the part structure, size, and welding parameters during the welding process.

[0020] Further preferably, the range of the pre-tightening force is 20 N to 500 N.

[0021] Further preferably, the lower clamping tool includes an annular pit structure, and the annular polychlorotrifluoroethylene can be embedded in the annular pit structure. The lower clamping tool is fixed on the workbench through parts such as bolts.

[0022] Preferably, the aluminum alloy part is provided with an annular groove, and the annular polychlorotrifluoroethylene is embedded in the annular groove.

[0023] Further preferably, the cross-sectional shape of the annular groove can be rectangular or dovetail-shaped, without limitation.

[0024] In the present invention, the aluminum alloy valve flap assembly has a groove structure for connection, and its connection surface is the top surface of the groove. The shape and size of the groove need to be adapted to the annular polychlorotrifluoroethylene component, and the groove structure can be in various forms such as a rectangular groove and a dovetail groove.

[0025] Preferably, the circumferential shape of the aluminum alloy / polychlorotrifluoroethylene composite valve flap is annular.

[0026] In the present invention, the circumferential shape of the aluminum alloy / polychlorotrifluoroethylene is preferably annular, and the shape of its connection surface is not limited. Preferably, it is a plane, and it can also be a curved surface structure.

[0027] Preferably, the welding tool includes an annular friction part for generating heat by friction.

[0028] Further preferably, the thickness of the annular friction part is 3-10 mm.

[0029] Further preferably, the bottom of the annular friction part is a flat structure.

[0030] Preferably, the material of the welding tool is cemented carbide, tungsten rhenium alloy or H13 steel.

[0031] Even more preferably, the cemented carbide includes tungsten carbide cobalt-based alloy.

[0032] Preferably, the temperature measuring tool includes a thermocouple for measuring the temperature of the joint surface between the aluminum alloy part and the annular polytetrafluoroethylene.

[0033] Further preferably, tunnels for the insertion of the thermocouple are provided on the aluminum alloy part.

[0034] Even more preferably, a plurality of tunnels for the insertion of the thermocouple are provided on the aluminum alloy part.

[0035] Even more preferably, the cross-sectional shape of the tunnel is square or circular.

[0036] In the present invention, the aluminum alloy part is machined to form a plurality of square or circular tunnels for the thermocouple to be inserted during welding to measure the temperature field.

[0037] Even more preferably, the end point (temperature measuring point) of the tunnel is located on the metal side near the joint interface.

[0038] In the present invention, the end point (temperature measuring point) of the square or circular tunnel is located near the aluminum alloy / polytetrafluoroethylene joint interface area, and preferably the temperature measuring point is on the metal side near the joint interface.

[0039] Further preferably, the thermocouple is a flexible thermocouple.

[0040] Further preferably, the temperature measuring tool includes a thermocouple, a signal acquisition device, supporting software and a working computer.

[0041] Preferably, the force measuring tool includes a force sensor for measuring the welding force.

[0042] A manufacturing method for an aluminum alloy / polytetrafluoroethylene composite valve flap, which is carried out using the above manufacturing device, includes the following steps:

[0043] S1: Insert the annular polytetrafluoroethylene into the annular groove of the aluminum alloy part to make the joint surface between the aluminum alloy part and the annular polytetrafluoroethylene in contact, obtaining an aluminum alloy / polytetrafluoroethylene assembly;

[0044] S2: Fix the assembled aluminum alloy / polytetrafluoroethylene assembly on the workbench using a clamping tool;

[0045] S3: Weld the aluminum alloy / polychlorotrifluoroethylene component with a welding tool. The welding tool rotates and presses down. Heat is generated through the frictional effect between the welding tool and the upper surface of the aluminum alloy. The heat is conducted to the interface through the aluminum alloy, melting the polychlorotrifluoroethylene at the interface. After welding, the melted polychlorotrifluoroethylene cools and solidifies, thus forming a connection to obtain the aluminum alloy / polychlorotrifluoroethylene composite valve flap.

[0046] Preferably, when the welding tool in step S3 is welding, the rotation speed is between 200 rpm and 1500 rpm, the pressing-down speed of the welding tool is between 0.1 mm / min and 10 mm / min, and the pressing-down amount is between 0.3 and 2 mm.

[0047] More preferably, the rotation speed of the welding tool is between 400 and 800 rpm, the pressing-down speed is 0.6 - 2 mm / min, and the pressing-down amount is 0.4 - 1.2 mm.

[0048] Preferably, the welding time in step S3 is 30 - 120 s, and the interface temperature is 220 - 450 °C.

[0049] In the present invention, by precisely controlling the welding process parameters, it is ensured that the interface temperature of the aluminum alloy / polychlorotrifluoroethylene connection surface during the welding process remains within the range of 220 - 450 °C. Under optimized thermal conditions, high-quality connection of the complex-structured aluminum alloy / polychlorotrifluoroethylene valve flap assembly is achieved.

[0050] In the present invention, during the welding process, the synergistic effect of the collected welding force and interface temperature can be analyzed to optimize the welding parameters and improve the quality of the aluminum alloy / polychlorotrifluoroethylene interface connection.

[0051] In the present invention, in step S3 during the welding process, the heat generated by the friction between the welding tool and the aluminum alloy surface is transferred to the aluminum alloy / polychlorotrifluoroethylene connection interface through heat conduction, melting and flowing the polychlorotrifluoroethylene at the interface. Under the action of pressure, the polychlorotrifluoroethylene wets the aluminum alloy surface and forms an effective bond with it. Throughout the process, the temperature of each part of the aluminum alloy component is always lower than its melting point.

[0052] Preferably, the surface to be connected of the aluminum alloy part in step S1 is prepared with an active rough layer through surface treatment.

[0053] Before welding, a surface active rough layer is prepared on the aluminum alloy surface to be connected through surface treatment, which is beneficial to improving the bonding quality of the aluminum alloy / polychlorotrifluoroethylene connection interface.

[0054] More preferably, the surface treatment method includes but is not limited to electrochemical oxidation, laser treatment, sandblasting treatment, and plasma treatment.

[0055] Preferably, the aluminum alloy part can be preheated before step S1, and the preheating temperature does not exceed the melting temperature of polychlorotrifluoroethylene, and the preheating time is 30 - 120 s.

[0056] The present invention relates to the fabrication of aluminum alloy / polychlorotrifluoroethylene composite valve flaps and related devices, and particularly to the welding of complex structural parts of aluminum alloy and polychlorotrifluoroethylene for valve flap applications, including welding devices, welding methods, and process design and development, belonging to the field of connection preparation of dissimilar metal and polymer materials with special-shaped structures.

[0057] Although the applicability of friction lap welding in the field of connecting metals and polymers with flat structures has been fully demonstrated, due to the limitations of the shape and size of the complex structure of the rotating body, it is difficult to achieve uniform temperature distribution in the welding area during the friction welding process, and it is also difficult to ensure the consistency of the welding conditions. In addition, in the friction welding of complex structures, local heating and pressurization of specified key parts is another difficult problem. At the same time, flat welding is only applicable to the connection of relatively single positions and cannot be transplanted to the welding of metal and polymer parts with higher spatial dimensions. Through the design and development of the welding device and welding method, this method can successfully combine aluminum alloy and polychlorotrifluoroethylene in the specified area (the groove area of the aluminum alloy part), and at the same time, the conditions in each part of the connection area are consistent, and the thermal conditions are evenly distributed. This method can not only meet the requirements of high-performance connection, but also be successfully applied to the preparation of aluminum alloy / polychlorotrifluoroethylene composite valve flaps, significantly improving their overall performance and application value.

[0058] After welding by the welding device, method, and process parameters of the present invention, the aluminum alloy / polychlorotrifluoroethylene valve flap assembly can form a high-quality bond both macroscopically and microscopically, showing excellent connection performance.

[0059] Compared with the prior art, the present invention has the following beneficial effects:

[0060] 1. The present invention realizes the high-quality direct connection of complex-structured aluminum alloy and polychlorotrifluoroethylene through friction lap welding technology, providing an innovative solution and related devices for efficiently fabricating high-performance metal / polymer composite valve flaps.

[0061] 2. The welding device of the present invention limits the position of the aluminum alloy / polychlorotrifluoroethylene assembly through clamping tools to ensure the stability of the welding process. The welding method uses friction lap welding technology, melts the polychlorotrifluoroethylene by frictional heat generation, and completes the efficient connection of the two materials by combining the welding force.

[0062] 3. The present invention has significant advantages such as simple process, convenient disassembly and assembly of the device, high welding efficiency, and excellent interface bonding quality. It can achieve high-quality and high-efficiency preparation of aluminum alloy / polychlorotrifluoroethylene composite valve flaps with different complex shapes and sizes, and is applicable to the connection requirements of metal / polymer materials with various complex structures.

[0063] 4. Compared with the existing hot pressing technology, the present invention has the advantages of wide application range, high connection quality, convenient operation, stable process, and high efficiency.

[0064] 5. The present invention has a wide application range. The described device, method, and process parameters are applicable to the preparation of aluminum alloy / polychlorotrifluoroethylene composite valve flaps with complex structures. Through the optimized design of the welding device, the preparation requirements of various aluminum alloy / polychlorotrifluoroethylene composite valve flaps can be met, including planar and curved surface connections with different shapes and sizes.

[0065] 6. The present invention has high connection quality. During the welding process, only the local temperature at the metal / polymer connection interface rises, avoiding damage to the performance of the polymer matrix. In most cases, there is no need for complex pretreatment of the metal or polymer connection surface. Through precise optimization of the welding parameters, high-strength bonding at the interface can be achieved, ensuring excellent connection quality.

[0066] 7. The present invention is convenient to operate and has a stable process. The welding device is simply designed, easy to disassemble, replace, and operate flexibly, with a high reuse rate, which helps to reduce the use cost and simplify the operation process. At the same time, the described devices cooperate with each other to ensure the stable realization of the welding process and the uniformity and repeatability of high-quality bonding at the interface.

[0067] 8. The present invention has high efficiency. The adopted welding method can quickly complete the preparation of aluminum alloy / polychlorotrifluoroethylene composite valve flaps. The welding steps are simple, time-saving, and labor-saving, significantly improving the production efficiency and showing higher efficiency advantages compared with the traditional hot pressing method. Brief Description of the Drawings

[0068] Figure 1 It is a schematic diagram of a manufacturing method and device for an aluminum alloy / polychlorotrifluoroethylene composite valve flap according to the present invention;

[0069] Figure 2 It is a schematic diagram of the welding tool used in the present invention;

[0070] Figure 3 It is a schematic diagram of the clamping tool for the upper part of the component in the present invention;

[0071] Figure 4 It is a schematic diagram of the clamping tool for the lower part of the component in the present invention;

[0072] Figure 5 It is a schematic diagram of the structure of an aluminum alloy part applicable to the method of the present invention;

[0073] Figure 6 Schematic diagram of the annular polychlorotrifluoroethylene structure applicable to the method of the present invention;

[0074] Figure 7 Schematic diagram of the contact between the clamping tool for the upper part of the component and the aluminum alloy part during the welding process of the present invention;

[0075] Figure 8 Characterization diagram of the interface bonding in Example 1;

[0076] Figure 9 Characterization diagram of the interface bonding in Example 2;

[0077] Figure 10 Schematic diagram of the assembly and positional relationship between the clamping tool and the part in Comparative Example 1;

[0078] In the figure: 1 - workbench, 2 - clamping tool, 21 - upper clamping tool, 22 - lower clamping tool, 3 - welding tool, 4 - aluminum alloy part, 41 - top surface of the groove for connection of the aluminum alloy part, 5 - annular polychlorotrifluoroethylene, 6 - thermocouple for temperature measurement, a - downward pressing direction of the welding tool, b - rotation direction of the welding tool. Specific embodiments

[0079] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and the detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0080] A manufacturing method and device for an aluminum alloy / polychlorotrifluoroethylene composite valve flap. The device involved in this method mainly consists of a clamping tool 2, a welding tool 3, a workbench 1, a welding device (which can be equipped with a force sensor), a thermocouple and a temperature measuring device, and a force sensor and a force acquisition device, etc.

[0081] Among them, the clamping tool mainly includes two parts: one part plays a role in longitudinal load bearing and position fixing and is located below the component to be welded during the welding process; the other part plays a role in pressing and preventing the component to be welded from deflecting and tilting during the welding process and is placed above the component to be welded during the welding process. The two parts of the clamping tool work together to ensure the stability of the welding process.

[0082] Specifically, the clamping tool that plays a role in longitudinal load bearing has an annular pit structure, which can enable the annular polychlorotrifluoroethylene to be embedded and remain stable, and at the same time, this structure cannot hinder the longitudinal movement of the aluminum alloy part to be welded during the welding process.

[0083] The clamping tool that plays a pressing and stabilizing role has an annular structure, which can cooperate with the aluminum alloy structure to prevent the aluminum alloy parts from tilting and flipping, ensuring the stability of the welding process; at the same time, this structure has a longitudinal degree of freedom and can move longitudinally along with the welding process.

[0084] The two-part clamping tool mentioned above has a hole structure for fixing and is fixed on the workbench using fixing parts such as bolts.

[0085] The structural dimensions of the clamping tool need to match the aluminum alloy and the polytetrafluoroethylene valve flap assembly to be welded to ensure the smooth progress of the welding process.

[0086] The material of the clamping tool mentioned above needs to have sufficient strength and stiffness to withstand the downward pressure exerted during the welding process and is usually made of steel.

[0087] The aluminum alloy / polytetrafluoroethylene structural assembly mentioned above should enable good cooperation between the two, that is, the groove for connection in the aluminum alloy should enable the polytetrafluoroethylene to be embedded and form good contact; at the same time, the cooperation between the two before welding should enable the aluminum alloy and the polytetrafluoroethylene to have a longitudinal degree of freedom of relative movement.

[0088] The part of the welding tool for generating heat by friction is annular, preferably planar, and its size depends on actual needs; the structure and shape of the bottom surface of the welding tool for generating heat by friction can also be designed according to actual needs to control the efficiency of heat generation by friction and the heat distribution, and to regulate the flow behavior of the polytetrafluoroethylene melt during the welding process.

[0089] The structure and shape design of the bottom surface of the welding tool mentioned above can be selected according to specific needs, including but not limited to groove structures and thread structures. The structure, size and quantity of the bottom surface can be flexibly adjusted without limitation.

[0090] The size of the friction part on the bottom surface of the welding tool depends on the size of the metal parts and actual needs and is not limited. The thickness of the friction part on the bottom surface of the welding tool is preferably 3 - 10 mm.

[0091] The structure, shape and size of the part of the welding tool that is not used for friction depend on actual needs and are not limited.

[0092] The material selection of the welding tool should be determined according to actual needs. Generally, hard alloys (such as tungsten carbide cobalt-based alloys), tungsten rhenium alloys or H13 steel and other materials are selected to ensure its strength and durability.

[0093] The connection of the aluminum alloy / polytetrafluoroethylene composite assembly is realized by using the friction lap welding method, including the following steps:

[0094] (1) The annular polytrifluoroethylene is embedded in the annular groove of the aluminum alloy part for connection, and the two are combined together by appropriate size matching so that the aluminum alloy and the polytrifluoroethylene are in good contact with each other;

[0095] (2) Fix the assembled aluminum alloy / polytrifluoroethylene component on the workbench using the clamping tool to ensure the stability of the component during the welding process;

[0096] (3) The aluminum alloy / polychlorotrifluoroethylene component is welded by a welding tool used for metal / polymer friction lap welding. The welding process is as follows: the welding tool presses down the aluminum alloy / polychlorotrifluoroethylene component fixed by the welding device at a certain rotation speed, keeps rotating and presses down to a certain depth at a certain pressing speed, generates heat by the friction between the welding tool and the upper surface of the aluminum alloy, and conducts the heat to the interface through the aluminum alloy, so that the polychlorotrifluoroethylene at the interface melts and reacts with the aluminum alloy surface under a certain thermal effect to form an interface connection. After welding, the melted polychlorotrifluoroethylene cools and solidifies, thereby forming a connection. The rotation speed of the welding tool is between 200rpm and 1500rpm, the pressing speed of the welding tool is between 0.1mm / min and 10mm / min, and the welding pressing amount is between 0.3 and 2mm. By controlling the welding process parameters, the interface temperature of the aluminum alloy / polychlorotrifluoroethylene connection surface is regulated to 220℃ to 450℃, and high-quality connection of the aluminum alloy / polychlorotrifluoroethylene composite component is achieved under welding thermal conditions.

[0097] The completion time of the welding process described in step (3) can be selected according to actual conditions, preferably 30 to 120 seconds.

[0098] As a preferred technical solution, in step (1), the surface of the aluminum alloy parts to be connected can be surface treated to prepare an active rough layer on the surface to improve the bonding quality between the aluminum alloy and polytrifluorochloroethylene.

[0099] As a preferred technical solution, the shape and size of the clamping tool in step (2) are coordinated with the structural aluminum alloy / polytrifluoroethylene valve flap assembly to be welded, thereby ensuring the stability of the welding process. The clamping tool can ensure that the aluminum alloy / polytrifluoroethylene valve flap assembly does not move or tilt during the welding process, and allows the aluminum alloy to move longitudinally.

[0100] As a preferred technical solution, in step (3), the components to be welded may be preheated before welding, and the preheating device includes but is not limited to a hot air gun, a heating plate, etc. The preheating temperature shall not exceed the melting temperature of polytrifluorochloroethylene, and the preheating time is preferably 30 to 120 seconds.

[0101] As a preferred technical solution, in step (3), the welding force during the welding process can be collected by the force sensor provided by the equipment, or can be monitored in real time using an external device.

[0102] As a preferred technical solution, the welding force collection device can be placed in the clamping tool so that it is in contact with the component to be welded. The welding force collection can be performed simultaneously at multiple positions according to actual needs.

[0103] As a preferred technical solution, before welding all the above steps, a square or circular hole with a side length of 1 to 2 mm (or a radius of 0.5 to 1 mm) is processed at the appropriate position of the aluminum alloy valve disc assembly. The end point of the hole (temperature measurement point) should be as close to the connection interface as possible to accurately monitor the temperature change. During the welding process, a thermocouple is placed in the hole to collect temperature data. The number and position distribution of the holes can be adjusted according to actual needs, and multiple measurement points can be set to obtain comprehensive temperature distribution information.

[0104] As a preferred technical solution, the thermocouple and the temperature measuring device include but are not limited to a flexible thermocouple, a temperature collector and a working computer.

[0105] As a preferred technical solution, the workbench is a thick metal plate, and its size and shape can be designed according to actual needs, and it must have sufficient strength and rigidity to meet welding requirements. The workbench is provided with a hole structure for fixing clamping tools, such as screw holes, and its spacing, size and number can be determined according to actual needs. The workbench is designed to facilitate disassembly and assembly.

[0106] As a preferred technical solution, the workbench is a square metal thick plate, the strength and rigidity of which should meet the welding requirements, and there is a hole structure on the workbench for bolt connection.

[0107] The following describes it in detail with reference to specific embodiments.

[0108] Unless otherwise specified, the reagents, methods, instruments and equipment used in the present invention are conventional reagents, methods, instruments and equipment in the art. Unless otherwise specified, the reagents and materials used in the following examples are commercially available.

[0109] Example 1

[0110] Before conducting relevant experiments, a galvanic groove with a diameter of 1 mm was opened at a suitable position of the aluminum alloy part 4. The depth of the groove was 6 mm, and the longitudinal distance between the groove and the connection interface was 0.5 mm.

[0111] The aluminum alloy part 4 after the slotting is anodized using a sulfuric acid solution with a volume fraction of 20%. The anodization adopts a constant current mode, an oxidation current of 5A, and an oxidation time of 2 hours, and an active layer with a certain roughness is generated on the surface to be connected of the aluminum alloy part 4.

[0112] like Figure 5 As shown, the annular groove of the aluminum alloy part 4 used for connection has a width of 5 mm, a depth of 4 mm, an inner diameter of 55 mm, and an outer diameter of 65 mm.

[0113] The anodized aluminum alloy part 4 is connected to a ring-shaped polytrifluoroethylene 5 (such as Figure 6 As shown) are combined together so that the groove top surface 41 of the aluminum alloy part 4 used for connection is in close contact with the annular polytrifluorochloroethylene 5.

[0114] The clamping tool for the lower part of the assembly (lower clamping tool 22) is fixed to the workbench 1 with bolts to ensure tightness.

[0115] The matched aluminum alloy part 4 and the annular polytrifluorochloroethylene 5 are placed on the lower clamping tool 22. Figure 4 As shown, the concave platform of the lower clamping tool 22 is used to place the annular polytrifluorochloroethylene 5, which has a diameter of 65mm and a depth of 5mm. The fixture must ensure that the assembly does not deflect and move during welding, and that the lower clamping fixture 22 does not collide with the aluminum alloy part 4.

[0116] The flexible thermocouple used for temperature measurement (temperature measurement thermocouple 6) is placed in the pre-processed thermocouple groove.

[0117] After the positional relationship between the lower clamping tool 22, the annular polytrifluorochloroethylene 5 and the aluminum alloy part 4 is fixed, the clamping tool for the upper part of the assembly (upper clamping tool 21) is placed on the aluminum alloy part 4 and fixed to the workbench 1 with bolts to give the assembly a pre-tightening force. Figure 3 After being fixed, the contact effect between the aluminum alloy part 4 and the aluminum alloy part 4 is as shown in FIG. Figure 7 shown.

[0118] like Figure 1 As shown, during the welding process, the pressing direction a of the welding tool 3 is longitudinally downward, and the rotation direction of the welding tool 3 (welding tool rotation direction b) is clockwise. In this experiment, the welding force is monitored and collected by the force sensor provided by the equipment.

[0119] Welding tools 3 such as Figure 2 The part used to generate heat through friction has a diameter and thickness of 5mm, and the inner and outer diameters are 40mm and 50mm respectively.

[0120] In this embodiment, at the initial stage of welding, the rotation speed of the welding tool 3 is 500 rpm, the pressing speed is 1 mm / min, and the pressing amount is 0.6 mm.

[0121] For the components with successful welding, a milling machine is used to process the characterization samples in the connection interface area. Figure 8 This is the interface characterization diagram for this embodiment. In this embodiment, the measured interface temperature is about 360 °C. Under the better welding thermal conditions, a good connection is formed at the interface.

[0122] Embodiment 2

[0123] The devices, tools and assemblies used in this embodiment are the same as those in Embodiment 1.

[0124] In this embodiment, the corresponding rotational speed of the welding tool is 400 rpm, the downward pressure speed is 3 mm / min, and the downward pressure amount is 1.5 mm.

[0125] Figure 9 This is the interface characterization diagram corresponding to this embodiment. In this embodiment, due to the lower rotational speed of the welding tool, the larger downward pressure speed and the shorter welding time, the welding heat is relatively lower than that in Embodiment 1. The measured interface temperature is about 260 °C, and the welding force stability is slightly poor. Therefore, the interface connection quality is worse than that in Embodiment 1, and there are more interface defects.

[0126] Comparative Example 1

[0127] The devices (except the clamping tool 2), tools and assemblies used in this comparative example are the same as those in Embodiment 1.

[0128] The clamping tool and the clamping position relationship used in this comparative example are as Figure 10 shown. Among them, the center of the lower clamping tool 22 has a through hole with a diameter of 50 mm to prevent the aluminum alloy part 4 from colliding with it during the welding process. The four corners of the lower clamping tool 22 have screw holes for fixing it on the workbench 1. According to the Figure 10 shown position relationship, the annular polychlorotrifluoroethylene 5 is placed on the lower clamping tool 22, and then the aluminum alloy part 4 is placed on the annular polychlorotrifluoroethylene 5, so that the groove structure of the aluminum alloy part 4 matches the annular polychlorotrifluoroethylene 5. Finally, the upper clamping tool 21 is pressed tightly on the edges on both sides of the aluminum alloy part 4 with bolts. The pressing area has a radial width of 5 mm along the aluminum alloy part 4 to prevent the clamping tool from colliding with the welding tool 3.

[0129] In this comparative example, the rotational speed of the selected welding tool 3 is 500 rpm, the downward pressure speed is 1 mm / min, and the downward pressure amount is 0.6 mm.

[0130] During the welding process, since the aluminum alloy part 4 is pressed and moves downward, the upper clamping tool 21 is separated from the aluminum alloy part 4, and the upper clamping tool 21 loses the pressing and fixing effect on the aluminum alloy part 4. The aluminum alloy part 4 rotates, shifts and shakes under the action of the welding tool 3, and welding cannot be achieved.

[0131] The present invention is based on friction lap welding technology, including a welding device, a welding method, and process development. Through friction lap welding technology, the present invention realizes high-quality direct connection between complex-structured aluminum alloy and polychlorotrifluoroethylene, providing an innovative solution and related device for efficiently manufacturing high-performance metal / polymer composite valve flaps. Compared with traditional hot pressing connection methods, this technology realizes the connection of high-efficiency metal / polymer composite valve flaps by welding, and the device used ensures the stability and convenience of the welding process. The friction lap welding process has significant advantages such as simple operation and high process controllability. It can monitor the interface temperature and downward pressure in real time during the welding process, and precisely regulate the welding heat input and pressure parameters through a feedback mechanism to achieve the optimal coupling of thermal and mechanical parameters, thereby significantly improving the welding quality. Through the welding device, precise control of the entire welding process can be effectively ensured while ensuring the stability of the welding process. The present invention can effectively inhibit the generation of defects at the connection interface between aluminum alloy and polychlorotrifluoroethylene, ensuring that the welded joint has excellent strength and sealing performance, providing strong technical support for the performance improvement and efficient preparation of composite valve flaps.

[0132] The above embodiments have described in detail the specific implementation steps and implementation manners of the device and the corresponding method involved in the present invention. It should be noted that the present invention does not limit the specific shapes and sizes of the aluminum alloy parts and polychlorotrifluoroethylene, does not limit the specific manner of surface treatment of the surfaces to be connected of the aluminum alloy parts, does not limit the related designs and uses of the corresponding clamping tools and clamping forms, does not limit the specific shapes and sizes of the welding tools, etc., and at the same time does not limit the selection of welding parameters and the monitoring of thermal and other parameters during the welding process. Those skilled in the art can make many changes and modifications according to the present invention. Therefore, any technical solutions obtained by those skilled in the art in the technical field of the present invention through logical analysis, reasoning, or experiments based on the content involved in the present invention are within the protection scope determined by the claims.

Claims

1. A manufacturing device for aluminum alloy / polytrifluoroethylene composite valve disc, characterized in that: include: Workbench (1); A clamping tool (2) for pressing and fixing the assembled aluminum alloy / polytrifluoroethylene component on the workbench (1); Welding tools (3) used to generate heat by friction with aluminum alloy parts; Temperature measuring tool used to measure the temperature of the surface area to be connected between aluminum alloy parts and annular polytrifluorochloroethylene; A force measuring tool for measuring the pressure of a welding tool (3) on an aluminum alloy part.

2. The manufacturing device for aluminum alloy / polytrifluoroethylene composite valve disc according to claim 1 is characterized in that: The clamping tool (2) comprises an upper clamping tool (21) and a lower clamping tool (22); The upper clamping tool (21) is bonded to the aluminum alloy part and fixed on the workbench (1), and the lower clamping tool (22) is bonded to the annular polytrifluorochloroethylene and fixed on the workbench (1).

3. The manufacturing device for aluminum alloy / polytrifluorochloroethylene composite valve disc according to claim 2 is characterized in that: The upper clamping tool (21) comprises a circular ring structure, which is in contact with the surface of the aluminum alloy part and is fixed on the workbench (1) via a connecting rod and bolts.

4. The manufacturing device for aluminum alloy / polytrifluorochloroethylene composite valve disc according to claim 3 is characterized in that: The annular structure is provided with an annular groove on the side close to the surface of the aluminum alloy part, so that the upper surface and the outer surface of the aluminum alloy part are both fitted with the annular structure.

5. The manufacturing device for aluminum alloy / polytrifluoroethylene composite valve disc according to claim 2 is characterized in that: The lower clamping tool (22) comprises an annular pit structure, into which annular polytrifluorochloroethylene can be embedded, and the annular pit structure is fixed on the workbench (1) via a fixing plate.

6. The manufacturing device for aluminum alloy / polytrifluorochloroethylene composite valve flap according to claim 1 is characterized in that: The aluminum alloy part is provided with an annular groove, and the annular polytrifluorochloroethylene is embedded in the annular groove.

7. The manufacturing device for aluminum alloy / polytrifluorochloroethylene composite valve disc according to claim 1 is characterized in that: The welding tool (3) comprises an annular friction portion for generating heat through friction.

8. The manufacturing device for aluminum alloy / polytrifluorochloroethylene composite valve disc according to claim 1 is characterized in that: The temperature measuring tool comprises a thermocouple for measuring the temperature of the surface to be connected between the aluminum alloy part and the annular polytrifluorochloroethylene, and the aluminum alloy part is provided with a tunnel for inserting the thermocouple; The force measuring tool comprises a force sensor for measuring welding force.

9. A method for manufacturing an aluminum alloy / polytrifluorochloroethylene composite valve flap, characterized in that: The method is carried out using the production device according to any one of claims 1 to 8, comprising the following steps: S1: embedding the annular polytrifluorochloroethylene into the annular groove of the aluminum alloy part so that the aluminum alloy part contacts the surface to be connected with the annular polytrifluorochloroethylene; S2: Fix the assembled aluminum alloy / polytrifluoroethylene component on the workbench (1) using a clamping tool (2); S3: The aluminum alloy / polychlorotrifluoroethylene assembly is welded by a welding tool (3). The welding tool (3) is rotated and pressed downward. Heat is generated by the friction between the welding tool (3) and the upper surface of the aluminum alloy. The heat is conducted to the interface through the aluminum alloy, so that the polychlorotrifluoroethylene at the interface is melted. After welding, the molten polychlorotrifluoroethylene is cooled and solidified, thereby forming a connection, and obtaining the aluminum alloy / polychlorotrifluoroethylene composite valve disc.

10. The method for manufacturing an aluminum alloy / polychlorotrifluoroethylene composite valve flap according to claim 9, characterized in that: When the welding tool (3) is used for welding in step S3, the rotation speed is between 200 rpm and 1500 rpm, the pressing speed of the welding tool (3) is between 0.1 mm / min and 10 mm / min, and the welding pressing amount is between 0.3 and 2 mm.

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