CN110774591A - Automatic temperature control equipment for induction welding of thermoplastic composite material - Google Patents
Automatic temperature control equipment for induction welding of thermoplastic composite material Download PDFInfo
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- CN110774591A CN110774591A CN201911109693.7A CN201911109693A CN110774591A CN 110774591 A CN110774591 A CN 110774591A CN 201911109693 A CN201911109693 A CN 201911109693A CN 110774591 A CN110774591 A CN 110774591A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
- B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
- B29C65/7841—Holding or clamping means for handling purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
- B29C65/7858—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/03—After-treatments in the joint area
- B29C66/032—Mechanical after-treatments
- B29C66/0322—Post-pressing without reshaping, i.e. keeping the joint under pressure after joining
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
- B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
- B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
Abstract
The invention discloses automatic temperature control equipment for induction welding of thermoplastic composite materials, which can automatically measure and control the temperature of a welding interface; the device comprises a thermoplastic composite material induction welding workbench, an infrared temperature measuring device, a high-pressure air cooling device, an induction device, a pressure applying device and a conveyor belt device. The infrared temperature measuring device measures the temperature of a welding interface in real time, returns data to the numerical control center for processing, and regulates and controls the voltage of a coil and the air flow of the high-pressure air cooling pipe by the numerical control center to ensure that the temperature of the welding interface is between the melting point of a welding material and the thermal decomposition temperature of a resin matrix; the pressing device applies certain pressure on a welding interface, so that welding forming is stabilized, and the quality of a weldment joint is improved. The equipment can realize accurate regulation and control of the temperature of a welding interface in the induction welding process of the thermoplastic composite material, inhibit resin decomposition at the interface and improve the interface, thereby obtaining a thermoplastic composite material welding piece with excellent and stable quality.
Description
Technical Field
The invention belongs to the technical field of induction welding of thermoplastic composite materials, and particularly relates to an automatic device for regulating and controlling the temperature of a welding interface and specially used for induction welding of thermoplastic composite materials.
Background
The thermoplastic resin-based composite material has weldability, and utilizes the characteristic that thermoplastic resin can be secondarily melted to heat and melt a connecting interface, so that resin molecules are diffused to complete connection, and the connecting interface has good compatibility with a base material. The fusion connection technology does not introduce new materials, the stress distribution of the connecting piece is more uniform than that of mechanical riveting, stress concentration cannot be generated, the welding process time is short, and automation is convenient to realize. Currently, the most potential welding methods are mainly ultrasonic welding, induction welding, resistance welding and linear vibration welding. Because the methods can uniformly heat the welding surface without heating the matrix, the method can overcome the difficulties of extremely high resin viscosity, slow flow spreading and the like on the surface of the continuous fiber reinforced composite material.
The induction welding is a welding method which heats an implanted inductor or a weldment capable of being inductively heated by utilizing electromagnetic induction through a magnetic field with high-frequency change, so that materials are melted and then the surface to be welded is filled to form durable combination. The induction welding process is stable, can realize continuous operation, is less influenced by human factors, and is an important development direction for the connection of thermoplastic composite materials in the future. The induction welding technology is particularly suitable for welding the carbon fiber reinforced thermoplastic composite material structural member. Because the carbon fiber can be conducted, eddy current can be generated through the induction coil to generate heat, so that when the carbon fiber reinforced thermoplastic composite material is welded, no additional induction material is required to be introduced, and only one side of the welded interface is required to be manufactured by adopting carbon fiber fabric prepreg paving. If other non-conductive fiber reinforced materials are welded, a conductive net, which can be carbon fiber or metal net, is additionally arranged at the interface. The induction coil does not directly contact with the induction material, and a non-induction area does not generate heat, so that when the parameters are reasonably set, welding is accurate, and deformation and redundant resin flowing are not easy to generate. The most used amount of induction welding is the sealing of the aseptic beverage box (the aluminium foil layer in the box wall is melted by induction heating and seals the outer layer of low density polyethylene). Other applications in the packaging industry are: cosmetic box (welding of polyethylene and polypropylene), plastic-coated metal cap and plastic bottle.
At present, no welding equipment special for thermoplastic composite material induction welding exists in the market, and the accurate temperature control of the thermoplastic composite material induction welding area is a key condition for obtaining a good-quality welding seam, so that the invention designs the automatic welding equipment special for the thermoplastic composite material induction welding and capable of accurately controlling the temperature of the welding area.
Disclosure of Invention
The invention designs the automation equipment special for the induction welding of the thermoplastic composite material, which realizes the dynamic and accurate control of the temperature at the welding interface and ensures the quality of the welding joint to a certain extent.
The invention adopts the following technical scheme: an automated apparatus for thermoplastic composite induction welding, comprising:
the thermoplastic composite material induction welding workbench is used for connecting a tool clamp and a gasket, and comprises thermoplastic composite material welding parts 1 and 2, a welding filling material 3, a nut 4, a stud 5, a clamp plate 6, a base plate 7 and a movable base 8; the nut 4, the stud 5, the clamp plate 6, the base plate 7 and the movable base 8 are all made of phenolic resin, the phenolic resin has high hardness and is not easy to deform when heated, and meanwhile, the phenolic resin has no ferromagnetism, cannot be heated, and cannot be shunted to reduce the heating efficiency.
A conveyor belt device which enables the moving base 8 to move, so that the induction welding automation can be realized; comprises a roller 9, a conveying crawler 10 and a motor 11. The computer control center 18 controls the rotation speed of the motor 11 to drive the rollers 9 to rotate, so that the conveying crawler 10 translates, and the moving base 8 is fixed on the conveying crawler 10, so that the device realizes automatic induction welding. And the moving speed of the moving base 11 can be controlled by controlling the rotation speed of the motor 10.
An infrared temperature measuring device is used for measuring the temperature of a welding interface and returning data to a numerical control center, and comprises an infrared temperature measuring instrument 12, wherein the temperature prediction and control of the welding interface are very critical to welding thermoplastic composite materials and are one of the decisive factors for determining the welding quality, the temperature of a welding area is recorded in real time by using the infrared temperature measuring instrument, the collected temperature data are returned to the numerical control center, and then the numerical control center adjusts the voltage of a cake-shaped solid metal coil 16 and the air flow of a high-pressure air cooling pipe 13, so that the temperature of the welding area is always between the melting point of a weldment and the thermal decomposition temperature of a weldment resin matrix, the weldment resin matrix is ensured not to be decomposed, and the quality of a welding joint is ensured.
The high-pressure air cooling device is used for reducing the temperature of a welding interface and preventing the resin matrix from being decomposed; including a high pressure air-cooling duct 13 and an air-cooling machine 14. The method is easier to control than water cooling, the computer control center 18 adjusts and controls the cooling speed of the welding interface by adjusting the air flow of the air cooling machine 14, and the temperature of the interface is rapidly reduced under the cooling effect, so that the molten resin rapidly finishes the crystallization process and is condensed again, and the matrix resin of the thermoplastic composite welding part cannot be decomposed.
The pressing device is used for applying a certain pressure to the welding interface to enable the welding joint to be formed more excellently and enable the quality of the welding joint to be improved; including the pressure roller 15. The pressing device can ensure that the welding interface can be tightly attached after being melted, so that high-strength connection is completed. The available pressing modes are generally two modes, namely vacuum bag pressing and roller rolling, but the upper limit of the pressing of the vacuum bag pressing cannot exceed one standard atmospheric pressure, so the roller rolling mode is adopted in the invention, and the rolling mode is suitable for continuous welding operation and is suitable for an automatic production mode.
The induction device is as follows: the induction coil is a generating device of an alternating current electromagnetic field, the configuration, voltage and frequency of the induction coil have great influence on the electromagnetic field, and the design of the coil can influence the heating efficiency and the heating speed of an induction material. There are two types of coils, one being a hollow metal tube and the other being a solid metal rod. The electromagnetic fields obtained by the two materials have different characteristics, the coil frequency range of the hollow tube is large, the power is large, but the energy conversion efficiency is lower and is not more than 60%, the coil frequency range of the solid metal rod is low, the power is also smaller, but the conversion efficiency is about 90%, and the solid metal with low frequency range, small power and high conversion efficiency is adopted in the invention because the power and the frequency of the induction welding are generally moderate. The coil structure can also influence an electromagnetic field, and the single-ring winding coil has a simpler magnetic field and is suitable for planes with smaller welding areas; the spiral coil is suitable for welding a cylindrical structure; the magnetic field of the pie-shaped coil is dense, and the pie-shaped coil is suitable for welding planes with large areas. According to the invention, the cake-shaped solid metal coil 16 is adopted, and the magnetizer is added in the middle of the coil, so that the coil has a magnetism gathering function, the coil efficiency is improved, and the part of the workpiece which does not need to be processed is prevented from being heated; while the relevant induction welding parameters of the induction heater 17 are regulated by the computer control center 18.
The selection of technological parameters, the frequency and voltage of the coil electrification, the distance between the coil and the induction material, the pressure application pressure and the retention time. The welding frequency is 200-1000 kHz, the proper welding frequency is input by a user, and the current frequency is achieved through a frequency converter. Increasing the voltage can increase the rate of temperature rise of the inductive material. However, too fast a temperature rise causes a too high temperature at the interface during welding, which leads to local degradation of the resin and a desired voltage through the transformer. The spacing of the coil from the inductive material can significantly affect the efficiency of the electromagnetic induction and thus the time required for welding. The coil is brought as close as possible to the welding interface to increase the welding efficiency, and the pitch can be adjusted by adjusting the height of the coil.
The pressure during welding does not affect the temperature increase and decrease speed of the interface, but applying a proper pressure is a necessary condition for ensuring high strength. When the pressure is too high during welding, the molten resin is extruded along the welding interface, so that the final welding quality is reduced. When the pressure is insufficient, defects such as pores, delamination, fiber folds, cracks and the like can occur at the interface. The height of the pressure roller is adjusted to ensure that the welding interface obtains proper pressure.
The most direct effect of the sensing time on the interface is the temperature of the interface. When the time is too short, the temperature at the interface is low, the resin is not melted sufficiently, and at this time, if the electromagnetic field is removed, the welded joint cannot be fused sufficiently, and high-strength connection cannot be achieved. On the contrary, the high temperature at the interface can cause the partial degradation of the resin, the molecular chain is shortened, the self strength of the joint and the welding layer can be finally reduced, and the proper moving speed is automatically input to determine the induction time.
The process parameter determination sequence of welding is as follows: firstly, clamping a welding workpiece, and adjusting the height of the pie-shaped solid metal induction coil 16 to ensure that the distance between the coil and an induction material is proper, wherein the distance between the coil and the induction material is determined and is as small as possible, so that the welding heating efficiency can be improved. After the interval of coil and response material is confirmed, the frequency of input electromagnetic field again, the power supply of coil is derived from the electric wire netting, and industrial electricity is mostly 220 ~ 380V, the frequency is mostly 50 ~ 60Hz, and this frequency alternating current can't produce the electromagnetic field that enough make the response material generate heat far away, through converting industrial alternating current into the direct current, the rethread oscillator turns into 200 ~ 1000 kHz's high frequency alternating current, the programming rate that raises the frequency can improve response material, but simultaneously, can make the electromagnetic field migrate near response coil, make near the intensity increase of coil, and the magnetic field of keeping away from the coil position weakens, thereby the biggest working distance between response coil and the response material has been restricted. Therefore, in actual operation, the proper frequency is selected according to the determined distance between the induction coil and the induction material, so that the welding efficiency is increased as much as possible. After the frequency of the electromagnetic field is determined, proper coil voltage is input next, welding efficiency can be improved as much as possible by inputting larger coil voltage, the temperature rising speed of the induction material can be improved by increasing the voltage, but the temperature rising speed is too high, so that the temperature at the interface is too high during welding to cause local degradation of resin, at the moment, the equipment can obtain the specific temperature of the welding interface through the infrared thermometer 12, after data is returned to the numerical control center, the numerical control center adjusts the flow of the adjusting gas of the high-pressure air cooling pipe 13 to reduce the temperature at the welding interface, and the resin matrix of the thermoplastic composite welding parts 1 and 2 is prevented from being locally degraded. The induction time of the welding is determined by the welding speed, and the welding moving speed can be adjusted by adjusting the rotating speed of the motor 11 of the welding device, so that the induction time of the welding is adjusted.
The invention has the advantages that no welding equipment specially used for the induction welding of the thermoplastic composite materials exists in the market at present, and the invention designs the automatic equipment specially used for the induction welding of the thermoplastic composite materials, and the equipment can automatically measure the temperature at the welding interface and make the temperature at the welding interface in a proper range by automatically adjusting the voltage of the pie-shaped solid metal induction coil and the air flow rate of the high-pressure air cooling pipe, thereby preventing the resin matrix of the welding part of the thermoplastic composite materials from being locally degraded due to overhigh temperature. The temperature prediction and the control of welding interface are very critical to welding thermoplastic composite materials and are one of the decisive factors for determining welding quality, therefore, the design can effectively ensure the welding quality, and meanwhile, the cooling mode of high-pressure air cooling is easier to control than the traditional water cooling mode, and the flow of regulated gas can accurately control the cooling effect. The invention adopts a pressure roller pressurization mode to pressurize the welding interface, the roller is suitable for an automatic production mode, and the pressure applied to the welding interface can be freely adjusted by adjusting the height of the roller, thereby being beneficial to the forming of a welding joint and improving the quality of the welding joint. The clamping device and the pressing device are mostly made of phenolic resin, the phenolic resin has high hardness and is not easy to deform when being heated, and meanwhile, the phenolic resin has no ferromagnetism, cannot be heated, and cannot be shunted to reduce the heating efficiency. In conclusion, the equipment realizes the automatic induction welding of the thermoplastic composite material, and accurately controls the temperature of the welding area, so that the equipment has certain guarantee on the quality of a welding joint, and the welding efficiency is improved as much as possible.
Drawings
Fig. 1 is a schematic view of weldment installation.
FIG. 2 is a schematic view of a thermoplastic composite induction welding work platform.
Fig. 3 is a general schematic diagram of a composite welding automation device.
Fig. 4 is a flow chart of the operation of the apparatus.
Wherein, 1, welding a thermoplastic composite material; 2. a thermoplastic composite weldment; 3. a filler material for welding; 4. a nut; 5. a stud; 6. a clamp plate; 7. a base plate; 8. a movable base; 9. a roller; 10. a conveying crawler; 11. a motor; 12. an infrared thermometer; 13. a high pressure air-cooled tube; 14. an air cooling machine; 15. a pressure roller; 16. a pie-shaped solid induction coil; 17. an induction heating machine; 18. and a computer control center.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Fig. 1 is a schematic view of weldment installation, and it can be seen that a gasket 7, a nut 4, a stud 5 and a clamp plate 6 fix two thermoplastic composite material weldments 1 and 2 on a moving base together, the two thermoplastic composite material weldments 1 and 2 are connected in an overlapping manner, a welding filling material 3 is filled in the welding middle face, and the gasket 7 is used for ensuring that a welding interface is horizontal, so that the welding interface is uniformly stressed, and a well-formed welding seam is obtained. The nut 4, the stud 5, the clamp plate 6 and the gasket 7 are all made of phenolic resin materials, the phenolic resin has high hardness and is not easy to deform when heated, meanwhile, the phenolic resin has no ferromagnetism, cannot be heated, and cannot be shunted to reduce the heating efficiency. The installation sequence is that firstly the thermoplastic composite material welding piece 2 is placed on a movable base 8, the nut 4, the stud 5 and the clamp plate 6 are used for fixing the thermoplastic composite material welding piece 2, then the gasket 7 is placed on one side of the thermoplastic composite material welding piece 2, the welding filling material 3 is added on the thermoplastic composite material welding piece 2, the composite welding piece 1 is placed on the gasket 7, and then the fixing device is used for fixing, so that the welding piece installation is completed.
FIG. 2 is a schematic view of a thermoplastic composite induction welding work platform. The thermoplastic composite material welding pieces 1 and 2, the moving base 8, the welding filling material 3, the nuts 4, the studs 5, the clamp plate 6 and the gaskets 7 move along with the translation of the conveying crawler 10. And the positions of the infrared thermometer 12, the high-pressure air cooling pipe 13, the pie-shaped solid metal induction coil 16 and the pressure roller 15 are kept unchanged in the welding process. The figures show that the thermoplastic composite material welding pieces 1 and 2 are fixed on a moving base 8, the moving base 8 is fixed on a conveying crawler 10, a motor 11 drives a roller 9 to rotate, and the conveying crawler 10 is driven by the roller 9, so that the induction welding automation is realized. Meanwhile, the pressure roller 15 is placed on the thermoplastic composite material welding part 1, a certain pressure is applied to a welding interface, welding forming can be stabilized, and the pressure of the welding interface is regulated and controlled by adjusting the height of the pressure roller. The pie-shaped solid metal induction coil 16 is positioned right above the lap joint part of the thermoplastic composite material welding parts 1 and 2 and used for generating induction current heating in the welding filling material 3 and connecting the thermoplastic composite material welding parts, and the distance between the pie-shaped solid metal induction coil 16 and a welding interface needs to be properly adjusted before welding. The infrared thermometer 12 and the high-pressure air cooling pipe 13 are respectively positioned at two sides of the platform, are aligned to the welding interface, and measure, regulate and control the temperature at the welding interface. The infrared thermometer 12 measures the temperature of the welding interface, the data is returned to the computer control center 18, and the computer control center 18 regulates the air flow of the high-pressure air cooling pipe 13 and the voltage of the pie-shaped solid metal induction coil 16, so that the temperature of the welding interface is ensured to be in a proper range, and the resin matrix of the welding part is ensured not to be decomposed.
Fig. 3 is a general schematic diagram of the composite material welding automation equipment, and it can be seen that the computer control center 18 can control the speed of induction welding in real time by controlling the rotation speed of the motor 11, during the welding process, the infrared thermometer 12 measures the temperature at the welding interface in real time, and returns the data to the computer control center 18, and the computer control center 18 controls the parameters of the induction heater 17 according to the measured temperature, thereby adjusting the voltage of the pie-shaped solid metal coil 16; and simultaneously, the parameters of the air cooling machine 14 are regulated and controlled, the control of the gas flow of the high-pressure air cooling pipe 13 is realized, the two aspects are combined, the real-time regulation and control of the temperature of a welding interface are realized, the temperature of the welding interface is moderate between the melting point of a welding material and the thermal decomposition temperature of a resin matrix, the joint quality of a welding piece is improved, and the thermoplastic composite welding piece with excellent and stable quality is obtained.
Fig. 4 is a flow chart of the operation of the apparatus.
It should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the scope of the present invention.
Claims (7)
1. An automated temperature control apparatus for induction welding of thermoplastic composites, comprising:
the thermoplastic composite material induction welding workbench is used for connecting the tool clamp and the gasket, and moving the base and the thermoplastic composite material welding workpiece;
the conveyor belt device enables the moving base to move in a controlled manner, so that the induction welding automation is realized;
the infrared temperature measuring device is used for measuring the temperature of the welding interface and returning data to the numerical control center;
the high-pressure air cooling device is used for reducing the temperature of a welding interface to prevent the resin matrix from being decomposed;
the pressure applying device is used for applying a certain pressure to a welding interface, so that the welding joint is more excellent in forming, and the quality of the welding joint is improved;
the induction device is used for generating a changing magnetic field and induction current in the filling material at the interface of the welding part, and releasing heat to connect the welding part while generating the induction current;
the numerical control center receives the data measured by the infrared temperature measuring device, regulates and controls the coil voltage and the high-pressure air-cooled gas flow so as to regulate and control the temperature at the welding interface, and regulates and controls the welding speed by controlling the moving speed of the welding platform;
the specific content of the above features is as follows: the thermoplastic composite material induction welding workbench comprises a thermoplastic composite material welding part, a welding filling material, a nut, a stud, a clamp plate, a base plate and a moving base; the conveying belt device comprises a roller, a conveying crawler belt and a motor; the infrared temperature measuring device comprises an infrared thermometer; the high-pressure air cooling device comprises a high-pressure air cooling pipe and an air cooling machine; the pressing device comprises a pressure roller; the induction welding device comprises a cake-shaped solid metal coil and an induction heating machine; the numerical control center comprises a computer control center.
2. The thermoplastic composite welding station of claim 1, wherein: the nut, the double-screw bolt, the clamp plate, the backing plate and the movable base are all made of phenolic resin, the material has high hardness and is not easy to deform when being heated, meanwhile, the phenolic resin has no ferromagnetism, cannot be heated, cannot be shunted to reduce the heating efficiency, and the movable base is fixed on the conveying track to realize automatic induction welding.
3. The conveyor belt assembly of claim 1, wherein: the roller is also made of phenolic resin, because the phenolic resin is not easy to deform and has no ferromagnetism, the motor is connected with the computer control center, and the computer control center controls the welding speed by controlling the rotating speed of the motor, so that the automatic induction welding with controllable speed is realized.
4. The infrared temperature measuring device of claim 1, wherein: the infrared thermometer measures the temperature of a welding interface in the welding process, transmits data to the computer control center, and is processed and analyzed by the computer control center, and the position of the infrared thermometer needs to be adjusted before welding so that the infrared thermometer can observe the temperature of the welding interface.
5. The high pressure air-cooled device of claim 1, wherein: the high-pressure air cooling pipe is connected with an air cooling machine, and the air flow of the air cooling machine is controlled by a computer control center.
6. The pressure applicator of claim 1, wherein: the pressure roller is also made of phenolic resin, different pressures can be obtained on a welding interface by adjusting the height of the roller before welding, stable and unchangeable pressure in the welding process is beneficial to forming after welding, and meanwhile, the rolling mode is suitable for continuous welding operation and is suitable for an automatic production mode.
7. The inductive device of claim 1, wherein: the induction coil is a cake-shaped solid metal coil, the conversion efficiency of the coil is high, the magnetic field is dense, the coil is suitable for welding of planes with large areas, and the magnetizer is added in the middle of the coil, so that the coil has a magnetism gathering function, the coil efficiency is improved, the heating of parts which do not need to be processed on a workpiece is prevented, and various induction welding parameters such as voltage, current, frequency and the like of an induction heater are controlled by a computer control center.
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| CN112355457A (en) * | 2020-11-13 | 2021-02-12 | 中车青岛四方机车车辆股份有限公司 | Welding method of resin-based carbon fiber composite-aluminum alloy welding system |
| CN113592846A (en) * | 2021-08-10 | 2021-11-02 | 广州特种承压设备检测研究院 | Hot-melting welding defect detection method and system for non-metal pipeline |
| CN113752572A (en) * | 2021-09-03 | 2021-12-07 | 威海星空软体机器人科技有限公司 | Apparatus and method for joining metal to flexible material |
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