Method and device for rapidly machining coating-free non-stick pan through laser assisted by electromagnetic induction heating
Through electromagnetic induction heating assisted laser processing, the problems of low efficiency and high cost of traditional laser processing are solved, and superhydrophobic microstructures are quickly prepared in non-stick pans, which improves processing speed and efficiency and reduces costs.
Patent Information
- Application Number
- CN202411436976.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-01-07
AI Technical Summary
Traditional laser processing non-stick pan technology consumes a large amount of laser energy at room temperature, resulting in low efficiency, high cost, and non-stick characteristics are prone to failure at high temperatures.
The method of electromagnetic induction heating assisted laser to quickly process the uncoated non-stick pan is used, and the metal pan bottom is quickly heated to the target temperature through the electromagnetic induction principle, and then a superhydrophobic microstructure is prepared using a laser processing system to reduce the energy consumption of laser ablation.
Under the same laser parameters, superhydrophobic microstructures of similar size and depth are quickly processed, which improves processing speed and efficiency, reduces costs, and achieves a physical non-stick effect without chemical coatings.
Smart Images
Figure CN119260167A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of laser processing cookware, and in particular relates to a method and a device for electromagnetic induction heating assisted laser rapid processing of non-coating non-stick pans. Background Art
[0002] Non-stick pans are widely popular among the public due to their excellent non-stick properties. The current mainstream non-stick pans use special chemical coating materials such as Teflon to achieve non-stick properties. These chemical coatings are easy to decompose and become ineffective and fall off at high temperatures, causing the non-stick pan to lose its non-stick properties, and it is easy to cause harm to the human body if the user accidentally eats it. Laser processing technology is used to manufacture non-stick pans without coating. This method achieves the non-stick effect by physically changing the surface structure of the pan body, without relying on chemical coatings.
[0003] At present, the traditional laser processing technology of non-stick pans is carried out at room temperature. The laser beam needs to heat the temperature of the processing area to above the melting point of the metal pan material. This process consumes a large amount of laser energy, resulting in low laser energy utilization and low processing efficiency, which in turn leads to slow processing speed and high processing cost.
[0004] Therefore, a method is needed to increase the speed of laser processing of non-stick pans. Under the same laser parameters, microstructures of similar size and depth can be processed on the bottom of metal pans more quickly to reduce processing time, improve laser processing efficiency, and reduce processing costs. Summary of the invention
[0005] In order to solve the defects existing in the related technology, the present invention provides a method and device for electromagnetic induction heating assisted laser rapid processing of uncoated non-stick pans. Under the same laser parameters, super-hydrophobic microstructures of similar size and depth can be processed on the bottom of a metal pan more quickly, so as to reduce the processing time, improve the efficiency of laser processing, and reduce the processing cost, so as to solve the above-mentioned technical defects.
[0006] In a first aspect, the present invention provides a method for electromagnetic induction heating assisted laser rapid processing of an uncoated non-stick pan, the method comprising the following steps:
[0007] Pretreatment: rinse and dry the bottom of the metal pot to be processed, and then place it horizontally on the processing table;
[0008] Parameter setting: selecting a metal coil of appropriate size and setting appropriate power supply parameters on the electromagnetic induction heating device, wherein the power supply parameters include voltage, power, and current size and frequency;
[0009] High temperature preheating, turning on the power switch of the thermometer and the electromagnetic induction heating device, and using the electromagnetic induction principle to quickly heat the bottom of the metal pot;
[0010] Laser patterning processing: when the bottom of the metal pot reaches the target temperature, the laser processing system is controlled to operate so that the laser beam processes the bottom of the metal pot according to the designed pattern trajectory to obtain a patterned microstructure;
[0011] Characterization test: After the laser processing is completed, the power is turned off, and a specific hydrophobic microstructure will be formed in the surface processing area of the bottom of the metal pot. After the metal pot is naturally cooled to room temperature, the surface processing area of the bottom of the metal pot is characterized and measured, and the hydrophobic performance is characterized.
[0012] By adopting the above technical solution, using the principle of electromagnetic induction, and adjusting the integrated controller parameters of the electromagnetic induction heating equipment, the bottom of the metal pot can be quickly and contactlessly heated to a suitable temperature, and then the laser processing system performs pattern processing on the surface processing area of the metal pot bottom to process a microstructure with a super-hydrophobic effect, which can quickly prepare a physical non-stick pan without the need for chemical coating. The high-temperature preheating of the metal pot bottom reduces the energy required for laser ablation, thereby reducing the number of laser actions to process super-hydrophobic microstructures of similar size and depth, increasing processing speed, improving production efficiency, and reducing production costs.
[0013] Preferably, the patterned microstructures include micro-stripe structures, micro-pillar structures, micro-hole structures, micro-polygonal structures and composite microstructures.
[0014] By adopting the above technical solution, a specific patterned super-hydrophobic microstructure is processed in the processing area of the metal pot bottom to achieve a non-stick effect. The super-hydrophobic microstructure can be of various shapes and sizes, the purpose of which is to reduce the actual contact area between the food and the bottom of the pot, promote the uniform distribution of grease on the pot surface, and thus reduce the possibility of food adhesion.
[0015] Preferably, the size of the patterned microstructure is 0.1-1000 μm, and the depth is 1-300 μm.
[0016] By adopting the above technical solution, the microstructure of appropriate size and depth can reduce the contact area between the base material of the bottom surface of the pot and the food, and reduce the friction between the food and the surface of the pot. At the same time, considering the applicability of laser processing, the size of the selected patterned microstructure is 0.1-1000μm and the depth is 1-300μm.
[0017] Preferably, the control of the laser processing system to make the laser beam process the bottom of the metal pot according to the designed patterned trajectory includes: using a laser single pulse energy of 10-50μJ, a pulse width of 15-50ns, a scanning speed of 10-2000mm / s, and a scanning number of 5-200 times.
[0018] By adopting the above technical solution, the laser beam is focused to the optimal laser spot diameter, and specific requirements are made for the laser single pulse energy, pulse width, scanning speed and number of times, thereby achieving fine processing of metal samples.
[0019] Preferably, the material of the metal pot includes stainless steel, iron, carbon steel, aluminum, alloy or composite material.
[0020] By adopting the above technical solution, the metal material selected for manufacturing the non-stick pan has a certain conductivity and magnetism, can effectively respond to the alternating magnetic field and generate eddy currents inside the material, and then through the resistance effect, convert electrical energy into thermal energy to heat the metal pan bottom to the target temperature.
[0021] Preferably, the metal pot bottom is quickly heated to a target temperature in the range of 300-1800°C by utilizing the electromagnetic induction principle.
[0022] By adopting the above technical solution, the target temperature should be set lower than the melting point of the material used to make the metal pot, so as to prevent the metal pot from melting directly due to heat. Generally speaking, the higher the target temperature, the lower the energy required for laser ablation and the higher the production efficiency. The specific temperature requirement is selected according to actual production needs.
[0023] Preferably, the laser processing system includes a laser generator for generating laser, a galvanometer for controlling the scanning path of the laser beam, a field lens for focusing the laser beam into a light spot at a certain working focal length, and a computer for controlling the on and off of the laser; the computer is installed with corresponding software and is simultaneously communicated with the laser generator and the galvanometer.
[0024] By adopting the above technical solution, the user controls the on and off of the laser and the processing path through the laser generator and the laser galvanometer, and focuses the laser beam to the optimal laser spot diameter under the focusing effect of the field lens, thereby realizing fine processing of metal samples. The corresponding processing path is designed through the corresponding software on the computer, and then the galvanometer is controlled by the computer to realize the movement of the laser beam along the set path.
[0025] Further preferably, the laser generator uses a laser in the ultraviolet, blue, green, or infrared bands, and the power of the laser generator is 1-1000W.
[0026] By adopting the above technical solution, users can select a laser generator with a suitable wavelength for a specific application scenario according to the absorption characteristics, optical effects, cost-effectiveness and other processing characteristics of the metal pot material. At the same time, the user can match the laser generator with a suitable power according to the efficiency, processing quality and economy of the laser processing, and the power of the laser generator is 1-1000W.
[0027] Preferably, the electromagnetic induction heating device comprises a metal coil formed by winding a certain number of turns of a hollow copper tube and an integrated controller, and the frequency of the alternating current output by the electromagnetic induction heating device is 20-300000 Hz.
[0028] By adopting the above technical solution, the integrated controller of the electromagnetic induction heating equipment controls the voltage, power, current size and frequency of the electromagnetic induction heating equipment. The metal coil in the electromagnetic induction heating equipment contains a certain number of turns, and adopts a metal material with high conductivity, strong anti-electromagnetic interference ability, high thermal conductivity and high ductility. Copper is usually used as the coil material. The selection of the alternating current frequency output by the electromagnetic induction heating equipment depends on the characteristics of the metal pot material, the heating requirements and the design of the heating equipment. The frequency of the alternating current output by the electromagnetic induction heating equipment is 20-300000Hz, so that the appropriate frequency can be selected according to the depth and efficiency required during actual processing.
[0029] In a second aspect, an embodiment of the present invention provides a device for electromagnetic induction heating assisted laser rapid processing of uncoated non-stick pans, comprising:
[0030] A pre-processing unit is configured to rinse and dry the bottom of the metal pot to be processed, and then place it horizontally on a processing table;
[0031] A parameter setting unit configured to select a metal coil of appropriate size and set appropriate power supply parameters on the electromagnetic induction heating device, wherein the power supply parameters include voltage, power, and current size and frequency;
[0032] A high temperature preheating unit is configured to turn on the power switch of the temperature measuring instrument and the electromagnetic induction heating device, and use the electromagnetic induction principle to quickly heat the bottom of the metal pot;
[0033] The laser patterning processing unit is configured to control the operation of the laser processing system when the bottom of the metal pot reaches a target temperature, so that the laser beam processes the bottom of the metal pot according to a designed patterned trajectory to obtain a patterned microstructure;
[0034] The characterization test unit is configured to turn off the power after the laser processing is completed, and a specific hydrophobic microstructure will be formed in the surface processing area of the bottom of the metal pot; after the metal pot is naturally cooled to room temperature, the surface processing area of the bottom of the metal pot is characterized and measured, and the hydrophobic performance is characterized.
[0035] Compared with the prior art, the beneficial results of the present invention are:
[0036] (1) By using the principle of electromagnetic induction and adjusting the integrated controller parameters of the electromagnetic induction heating device, the bottom of the metal pot can be quickly and contactlessly heated to a suitable temperature. Then, the laser processing system performs patterning processing on the surface processing area of the bottom of the metal pot to produce a microstructure with a super-hydrophobic effect, which can quickly produce a physical non-stick pan without the need for chemical coating. The high-temperature preheating of the bottom of the metal pot reduces the energy required for laser ablation, thereby reducing the number of laser actions required to produce super-hydrophobic microstructures of similar size and depth, thereby increasing processing speed, improving production efficiency, and reducing production costs.
[0037] (2) Microstructures of appropriate size and depth can reduce the contact area between the base material of the bottom of the pot and the food, and reduce the friction between the food and the surface of the pot. Considering the applicability of laser processing, the size of the selected patterned microstructure is 0.1-1000μm and the depth is 1-300μm; the laser beam is focused to the optimal laser spot diameter, and specific requirements are made for the laser single pulse energy, pulse width, scanning speed and number of times, so as to achieve fine processing of metal samples. BRIEF DESCRIPTION OF THE DRAWINGS
[0038] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated into and constitute a part of this specification. The accompanying drawings illustrate the embodiments and are used together with the description to explain the principles of the present invention. It will be easy to recognize other embodiments and many expected advantages of the embodiments because they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale with each other. The same reference numerals refer to corresponding similar parts.
[0039] Figure 1 It is a schematic flow chart of a method for rapid processing of an uncoated non-stick pan by electromagnetic induction heating assisted laser according to an embodiment of the present invention;
[0040] Figure 2 is a schematic structural diagram of a device for rapid processing of a non-stick pan without coating by electromagnetic induction heating assisted by laser according to an embodiment of the present invention;
[0041] Figure 3 This is a schematic diagram of the morphology results of laser direct processing without electromagnetic induction heating assistance on the bottom of a 316L stainless steel pot according to an embodiment of the present invention;
[0042] Figure 4 This is a characterization diagram of the hydrophobic performance of a 316L stainless steel pot bottom after laser direct processing without electromagnetic induction heating assistance according to an embodiment of the present invention;
[0043] Figure 5 This is a schematic diagram of the morphology results of electromagnetic induction heating assisted laser rapid processing on the bottom of a 316L stainless steel pot according to an embodiment of the present invention;
[0044] Figure 6 This is a characterization diagram of the hydrophobic performance of a 316L stainless steel pot bottom after electromagnetic induction heating assisted laser rapid processing according to an embodiment of the present invention.
[0045] Explanation of the reference numerals: 1. metal pot; 11. processing area on the bottom surface of the pot; 2. processing table; 3. electromagnetic induction heating equipment; 31. metal coil; 32. integrated controller; 4. thermometer; 5. laser processing system; 51. laser generator; 52. galvanometer; 53. field mirror; 54. computer. DETAILED DESCRIPTION
[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the relevant invention are shown in the accompanying drawings.
[0047] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0048] In a first aspect, an embodiment of the present invention discloses a method for electromagnetic induction heating assisted laser rapid processing of an uncoated non-stick pan, such as Figure 1 As shown, the method comprises the following steps:
[0049] S1, pretreatment, washing and drying the bottom of the metal pot 1 to be processed, and then placing it horizontally on the processing table 2;
[0050] Specifically, in this embodiment, the material of the metal pot 1 includes stainless steel, iron, carbon steel, aluminum, alloy or composite material. The metal material used to make the non-stick pan has certain electrical conductivity and magnetism, and can effectively respond to the alternating magnetic field and generate eddy currents inside the material, and then convert electrical energy into heat energy through the resistance effect to heat the bottom of the metal pot 1 to the target temperature.
[0051] S2, parameter setting, selecting a metal coil 31 of appropriate size, and setting appropriate power supply parameters on the electromagnetic induction heating device 3, wherein the power supply parameters include voltage, power, and current size and frequency;
[0052] Specifically, the electromagnetic induction heating device 3 includes a metal coil 31 formed by winding a certain number of turns of a hollow copper tube and an integrated controller 32. The frequency of the alternating current output by the electromagnetic induction heating device 3 is 20-300000 Hz.
[0053] The integrated controller 32 of the electromagnetic induction heating device 3 controls the voltage, power, current size and frequency of the electromagnetic induction heating device 3. The metal coil 31 in the electromagnetic induction heating device 3 contains a certain number of turns, and adopts a metal material with high conductivity, strong anti-electromagnetic interference ability, high thermal conductivity, and high ductility. Copper is usually used as the coil material. The selection of the alternating current frequency output by the electromagnetic induction heating device 3 depends on the characteristics of the metal pot 1 material, the heating requirements and the design of the heating device. The frequency of the alternating current output by the electromagnetic induction heating device 3 is 20-300000 Hz, so that the appropriate frequency can be selected according to the depth and efficiency required during actual processing.
[0054] S3, high temperature preheating, turning on the power switch of the thermometer 4 and the electromagnetic induction heating device 3, and using the electromagnetic induction principle to quickly heat the bottom of the metal pot 1;
[0055] Specifically, the bottom of the metal pot 1 is quickly heated to a target temperature in the range of 300-1800°C by using the principle of electromagnetic induction. The set target temperature should be lower than the melting point of the material of the metal pot 1 to prevent the metal pot 1 from being directly melted by heat. Generally speaking, the higher the target temperature, the lower the energy required for laser ablation and the higher the production efficiency. The specific temperature requirement is selected according to actual production needs.
[0056] S4, laser patterning processing, when the bottom of the metal pot 1 reaches the target temperature, the laser processing system 5 is controlled to operate so that the laser beam processes the bottom of the metal pot 1 according to the designed patterned trajectory to obtain a patterned microstructure;
[0057] Specifically, the obtained patterned microstructures include micro-stripe structures, micro-pillar structures, micro-hole structures, micro-polygonal structures and composite microstructures. A specific patterned super-hydrophobic microstructure is processed in the bottom processing area of the metal pot 1 to achieve a non-stick effect. The super-hydrophobic microstructure can be of various shapes and sizes, the purpose of which is to reduce the actual contact area between the food and the bottom of the pot, promote the uniform distribution of grease on the pot surface, and thus reduce the possibility of food adhesion.
[0058] Preferably, the size of the patterned microstructure is 0.1-1000 μm and the depth is 1-300 μm. Microstructures of appropriate size and depth can reduce the contact area between the base material of the bottom surface of the pot and the food, and reduce the friction between the food and the surface of the pot. Considering the applicability of laser processing, the size of the selected patterned microstructure is 0.1-1000 μm and the depth is 1-300 μm.
[0059] In this embodiment, processing the bottom of the metal pot 1 by using a laser beam according to the designed patterned trajectory includes: using a laser single pulse energy of 10-50 μJ, a pulse width of 15-50 ns, a scanning speed of 10-2000 mm / s, and a scanning number of 5-200 times. Focusing the laser beam to an optimal laser spot diameter, making specific requirements for the laser single pulse energy, pulse width, scanning speed and number, thereby achieving fine processing of the metal sample.
[0060] The laser processing system 5 includes a laser generator 51 for generating laser light, a galvanometer 52 for controlling the scanning path of the laser beam, a field lens 53 for focusing the laser beam into a spot at a certain working focal length, and a computer 54 for controlling the on and off of the laser. The computer 54 is installed with corresponding software and is simultaneously connected to the laser generator 51 and the galvanometer 52 for communication. The laser generator 51 uses lasers in the ultraviolet, blue, green, and infrared bands, and the power of the laser generator 51 is 1-1000W.
[0061] The user controls the on and off of the laser and the processing path through the laser generator 51 and the laser galvanometer 52, and focuses the laser beam to the optimal laser spot diameter under the focusing action of the field lens 53, thereby realizing fine processing of the metal sample. The corresponding processing path is designed through the corresponding software on the computer 54, and then the galvanometer 52 is controlled by the computer 54 to realize the movement of the laser beam along the set path. For a specific application scenario, the user selects a laser generator 51 with a suitable wavelength according to the processing characteristics of the metal pot 1 material, such as the absorption characteristics, optical effects, and cost-effectiveness. At the same time, a laser generator 51 with a suitable power is matched according to the efficiency, processing quality, and economy of the laser processing, and the power of the laser generator 51 is 1-1000W.
[0062] S5, characterization test, after the laser processing is completed, the power is turned off, and a specific hydrophobic microstructure will be formed in the processed area 11 on the bottom surface of the metal pot 1; after the metal pot 1 is naturally cooled to room temperature, the processed area 11 on the bottom surface of the metal pot 1 is characterized and measured, and the hydrophobic performance is characterized.
[0063] The present invention utilizes the electromagnetic induction principle, and by adjusting the parameters of the integrated controller 32 of the electromagnetic induction heating device 3, the bottom of the metal pot 1 can be quickly and contactlessly heated to a suitable temperature, and then the laser processing system 5 performs pattern processing on the surface processing area 11 of the bottom of the metal pot 1 to process a microstructure with a super-hydrophobic effect, and can quickly prepare a physical non-stick pan without chemical coating. The high-temperature preheating of the bottom of the metal pot 1 reduces the energy required for laser ablation, thereby reducing the number of laser actions to process super-hydrophobic microstructures of similar size and depth, increasing processing speed, increasing production efficiency, and reducing production costs.
[0064] It should be noted that the core invention of the present invention is to focus on the preparation of non-stick pans and improve the preparation efficiency of non-stick pans. Non-stick pans are very common products, but the existing technology has the problem of low production efficiency. The present invention can solve the above problem and quickly prepare a physical non-stick pan without chemical coating.
[0065] In a second aspect, an embodiment of the present invention further discloses a device for electromagnetic induction heating assisted laser rapid processing of uncoated non-stick pans, comprising: a preprocessing unit, a parameter setting unit, a high temperature preheating unit, a laser patterning processing unit and a characterization testing unit.
[0066] In a specific embodiment, the pretreatment unit is configured to rinse and dry the bottom of the metal pot 1 to be processed, and then place it horizontally on the processing table 2; the parameter setting unit is configured to select a metal coil 31 of appropriate size and set appropriate power supply parameters on the electromagnetic induction heating device 3, and the power supply parameters include voltage, power, and current size and frequency; the high-temperature preheating unit is configured to turn on the power switch of the thermometer 4 and the electromagnetic induction heating device 3, and use the electromagnetic induction principle to quickly heat the bottom of the metal pot 1; the laser patterning processing unit is configured to control the operation of the laser processing system 5 when the bottom of the metal pot 1 reaches the target temperature, so that the laser beam processes the bottom of the metal pot 1 according to the designed patterned trajectory to obtain a patterned microstructure; the characterization test unit is configured to turn off the power after the laser processing is completed, and a specific hydrophobic microstructure will be formed in the surface processing area 11 of the bottom of the metal pot 1; after the metal pot 1 is naturally cooled to room temperature, the surface processing area 11 of the bottom of the metal pot 1 is characterized and measured, and the hydrophobic performance is characterized.
[0067] Specifically, refer to Figure 2 , a device required for a method for electromagnetic induction heating assisted laser rapid processing of uncoated non-stick pans, including a processing table 2 for supporting a metal pan 1, an electromagnetic induction heating device 3 for heating the bottom of the metal pan 1 to a target temperature, a thermometer 4 for measuring the real-time temperature of the bottom of the metal pan 1, and a laser processing system 5 for patterned microstructure processing.
[0068] In this embodiment, the laser generator 51 uses an ultraviolet nanosecond laser. Depending on actual processing requirements, lasers in blue, green, infrared, and other bands may be used.
[0069] The electromagnetic induction heating device 3 is used to heat the bottom of the metal pot 1 to the target temperature. The user generates different alternating magnetic fields in the metal coil 31 by adjusting the voltage, power, current and frequency parameters of the integrated controller 32. In this embodiment, the metal coil 31 is wound by a hollow copper tube with a certain number of turns, which has the properties of high conductivity, strong anti-electromagnetic interference ability, high thermal conductivity and high ductility. The frequency parameter of the integrated controller 32 is set to 35kHz. According to the actual processing requirements, other suitable power supply frequencies can also be used to meet the actual processing requirements.
[0070] The laser processing system 5 includes a laser generator 51 for generating laser light, a galvanometer 52 for controlling the scanning path of the laser beam, a field lens 53 for focusing the laser beam into a spot at a certain working focal length, and a computer 54 for controlling the on and off of the laser light. The computer 54 is installed with corresponding software and is connected to the laser generator 51 and the galvanometer 52 for communication.
[0071] The user designs a corresponding processing path through the corresponding software on the computer 54, and then uses the computer 54 to control the galvanometer 52 to realize the movement of the laser beam along the set path, and under the focusing action of the field lens 53, the laser beam is focused to the optimal laser spot diameter, thereby realizing fine processing of the metal sample. In this embodiment, the laser single pulse energy is 10-50μJ, the pulse width is 15-50ns, the scanning speed is 10-2000mm / s, and the number of scans is 5-200 times.
[0072] Further, see Figure 2 and Figure 3 In this embodiment, the material of the metal pot 11 is the most common 316L stainless steel. According to steps S1, S4, and S5, the bottom of the metal pot 11 is directly processed by laser without electromagnetic induction heating to produce a super-hydrophobic microstructure, which is used as a control experiment to compare the non-stick properties. The processing effect is observed and compared using a shape measurement laser microscope. The results show that the micro-column structure directly processed by the laser has a width of about 100μm and a depth of about 50μm.
[0073] like Figure 4 As shown, the contact angle (CA) was measured using a video optical contact angle meter to compare the hydrophobic performance. The results showed that the contact angle CA of the bottom of the metal pot 1 directly processed by the laser was 150.9°.
[0074] Reference Figure 2 and Figure 5In this embodiment, electromagnetic induction heating assisted laser rapid processing was performed on the bottom of a 316L stainless steel pot according to steps S1, S2, S3, S4, and S5 to produce a super-hydrophobic microstructure. The same laser energy parameters were used, but the number of laser actions was 1 / 3 of that when the super-hydrophobic microstructure was directly processed without electromagnetic induction heating assisted laser. The array micro-pillar structure was processed on the bottom of the 316L stainless steel pot. The shape measurement laser microscope was also used to observe and compare the processing effects. The results showed that the micro-pillar structure rapidly processed by electromagnetic induction heating assisted laser had a width of about 100 μm and a depth of about 50 μm, which means that under the same laser parameters, electromagnetic induction heating assisted laser processing of non-stick pans can more quickly (3 times faster) process microstructures of similar size and depth on the bottom of the pot, thereby reducing processing time, improving laser processing efficiency, and reducing processing costs.
[0075] Reference Figure 6 The contact angle (CA) was measured using a video optical contact angle meter to compare the hydrophobic performance. The results showed that the contact angle CA of the bottom of the metal pot 1 rapidly processed by electromagnetic induction heating assisted laser was 153.7°, which means that the super-hydrophobic microstructure rapidly processed by electromagnetic induction heating assisted laser has a better hydrophobic effect than the super-hydrophobic microstructure directly processed by laser without electromagnetic induction heating assistance.
[0076] The present invention utilizes the electromagnetic induction principle, and by adjusting the parameters of the integrated controller 32 of the electromagnetic induction heating device 3, the bottom of the metal pot 1 can be quickly and contactlessly heated to a suitable temperature, and then the laser processing system 5 performs pattern processing on the surface processing area 11 of the bottom of the metal pot 1 to process a microstructure with a super-hydrophobic effect, and can quickly prepare a physical non-stick pan without chemical coating. The high-temperature preheating of the bottom of the metal pot 1 reduces the energy required for laser ablation, thereby reducing the number of laser actions to process super-hydrophobic microstructures of similar size and depth, increasing processing speed, increasing production efficiency, and reducing production costs.
[0077] Microstructures of appropriate size and depth can reduce the contact area between the base material of the bottom of the pot and the food, and reduce the friction between the food and the surface of the pot. Considering the applicability of laser processing, the size of the selected patterned microstructure is 0.1-1000μm and the depth is 1-300μm; the laser beam is focused to the optimal laser spot diameter, and specific requirements are made for the laser single pulse energy, pulse width, scanning speed and number of times, so as to achieve fine processing of metal samples.
[0078] The implementation principle of the embodiment of the present application is as follows: first rinse the bottom of the metal pot 1 to be processed with clean water and dry it, and then place it horizontally on the processing table 2; select a metal coil 31 of appropriate size, and set appropriate power supply parameters on the integrated controller 32, including voltage, power, current size and frequency; turn on the thermometer 4, and then turn on the power switch of the electromagnetic induction heating device 3, and use the electromagnetic induction principle to quickly heat the bottom of the metal pot 1; when the bottom of the metal pot 1 reaches the target temperature, control the operation of the laser processing system 5 so that the laser beam processes the bottom according to the designed patterned trajectory to obtain a patterned microstructure; after the laser processing is completed, turn off the power; a specific hydrophobic microstructure will be formed in the surface processing area of the bottom of the metal pot 1; after the metal pot 1 is naturally cooled to room temperature, the surface processing area of the bottom of the metal pot 1 is characterized and measured, and the hydrophobic performance is characterized.
[0079] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present invention (but not limited to) to form a technical solution.
Claims
1. A method for rapid processing of uncoated non-stick pans by electromagnetic induction heating assisted laser, characterized in that: The method comprises the following steps: Pretreatment: rinse and dry the bottom of the metal pot to be processed, and then place it horizontally on the processing table; Parameter setting: selecting a metal coil of appropriate size and setting appropriate power supply parameters on the electromagnetic induction heating device, wherein the power supply parameters include voltage, power, and current size and frequency; High temperature preheating, turning on the power switch of the thermometer and the electromagnetic induction heating device, and using the electromagnetic induction principle to quickly heat the bottom of the metal pot; Laser patterning processing: when the bottom of the metal pot reaches the target temperature, the laser processing system is controlled to operate so that the laser beam processes the bottom of the metal pot according to the designed pattern trajectory to obtain a patterned microstructure; Characterization test: After the laser processing is completed, the power is turned off, and a specific hydrophobic microstructure will be formed in the surface processing area of the bottom of the metal pot. After the metal pot is naturally cooled to room temperature, the surface processing area of the bottom of the metal pot is characterized and measured, and the hydrophobic performance is characterized.
2. The method for rapid processing of uncoated non-stick pans by electromagnetic induction heating assisted laser according to claim 1, characterized in that: The obtained patterned microstructures include micro-stripe structures, micro-pillar structures, micro-hole structures, micro-polygonal structures and composite microstructures.
3. The method for rapid processing of uncoated non-stick pans by electromagnetic induction heating assisted laser according to claim 1, characterized in that: The size of the patterned microstructure is 0.1-1000 μm, and the depth is 1-300 μm.
4. The method for rapid processing of uncoated non-stick pans by electromagnetic induction heating assisted laser according to claim 1, characterized in that: The control of the laser processing system to make the laser beam process the metal pot bottom according to the designed patterned trajectory includes: using a laser single pulse energy of 10-50μJ, a pulse width of 15-50ns, a scanning speed of 10-2000mm / s, and a scanning number of 5-200 times.
5. The method for rapid processing of uncoated non-stick pans by electromagnetic induction heating assisted laser according to claim 1, characterized in that: The material of the metal pot includes stainless steel, iron, carbon steel, aluminum, alloy or composite material.
6. The method for rapid processing of uncoated non-stick pans by electromagnetic induction heating assisted laser according to claim 1, characterized in that: The metal pot bottom is quickly heated to a target temperature in the range of 300-1800° C. by utilizing the electromagnetic induction principle.
7. The method for rapid processing of uncoated non-stick pans by electromagnetic induction heating assisted laser according to claim 1, characterized in that: The laser processing system includes a laser generator for generating laser, a galvanometer for controlling the scanning path of the laser beam, a field lens for focusing the laser beam into a light spot at a certain working focal length, and a computer for controlling the on and off of the laser; the computer is installed with corresponding software and is simultaneously connected to the laser generator and the galvanometer for communication.
8. The method for rapid processing of uncoated non-stick pans by electromagnetic induction heating assisted laser according to claim 7, characterized in that: The laser generator uses ultraviolet, blue, green and infrared lasers, and the power of the laser generator is 1-1000W.
9. The method for rapid processing of uncoated non-stick pans by electromagnetic induction heating assisted laser according to claim 1, characterized in that: The electromagnetic induction heating device comprises a metal coil formed by winding a certain number of turns of a hollow copper tube and an integrated controller. The frequency of the alternating current output by the electromagnetic induction heating device is 20-300000 Hz.
10. An electromagnetic induction heating assisted laser rapid processing device for non-stick pans without coating, characterized in that: include: A pre-processing unit is configured to rinse and dry the bottom of the metal pot to be processed, and then place it horizontally on a processing table; A parameter setting unit configured to select a metal coil of appropriate size and set appropriate power supply parameters on the electromagnetic induction heating device, wherein the power supply parameters include voltage, power, and current size and frequency; A high temperature preheating unit is configured to turn on the power switch of the temperature measuring instrument and the electromagnetic induction heating device, and use the electromagnetic induction principle to quickly heat the bottom of the metal pot; The laser patterning processing unit is configured to control the operation of the laser processing system when the bottom of the metal pot reaches a target temperature, so that the laser beam processes the bottom of the metal pot according to a designed patterned trajectory to obtain a patterned microstructure; The characterization test unit is configured to turn off the power after the laser processing is completed, and a specific hydrophobic microstructure will be formed in the surface processing area of the bottom of the metal pot; after the metal pot is naturally cooled to room temperature, the surface processing area of the bottom of the metal pot is characterized and measured, and the hydrophobic performance is characterized.