Laser nitriding device

Abstract

The utility model relates to the technical field of manufacturing equipment, and discloses a laser nitriding device, which is used for carrying out laser nitriding treatment on a workpiece to be processed, and comprises a bottom shell and a cover body, the bottom shell and the cover body are matched to form a closed accommodating cavity, reaction gas is filled in the accommodating cavity, and a laser generator is arranged on the bottom shell or the cover body. The laser generator is used for generating laser linear light spot flames, and the laser linear light spot flames irradiate the surface of a workpiece to be machined. The laser nitriding device is simple in structure, high in production efficiency, convenient to operate, low in labor intensity and capable of machining a nitriding layer which is thicker and higher in surface hardness.

Description

Technical Field

[0001] The utility model relates to the technical field of manufacturing equipment, in particular to a laser nitriding device. Background Art

[0002] In the prior art, in order to endow metal products with the characteristics of rust prevention, wear resistance and increased surface hardness, the workpiece can be nitrided to form a nitriding film on the surface of the workpiece. However, traditional nitriding methods require nitriding in a special nitriding furnace for more than a dozen hours before the workpiece can be taken out of the furnace, resulting in low production efficiency and high production costs. Moreover, the thickness of the nitriding film after nitriding is shallow, the hardness is low, and the wear resistance is poor. Summary of the Utility Model

[0003] Aiming at the shortcomings of nitriding treatment in the prior art, the utility model provides a laser nitriding device.

[0004] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0005] A laser nitriding device is used for laser nitriding treatment of a workpiece to be processed, including a cover body and a bottom shell. The cover body and the bottom shell cooperate to form a sealed accommodation cavity, and the accommodation cavity is filled with reaction gas. One or more laser generators are arranged on the cover body or the bottom shell, and the laser generators are used to generate a laser linear spot flame, and the laser linear spot flame irradiates on the surface of the workpiece to be processed. The utility model generates a laser linear spot flame through the laser generator, irradiates on the surface of the workpiece to be processed, and conducts nitriding reaction in the reaction gas. The laser nitriding device of the utility model has a simple structure, high production efficiency, and can generate a nitriding layer with a large thickness and high surface hardness.

[0006] Preferably, a gas inlet and a gas outlet are arranged on the cover body or the bottom shell, and both the gas inlet and the gas outlet are communicated with the accommodation cavity, so as to introduce flowing reaction gas into the accommodation cavity. Introducing flowing reaction gas into the accommodation cavity can continuously supplement the reaction gas, prevent the nitriding reaction from being affected due to insufficient reaction gas, and cause the thickness of the nitriding layer to be relatively thin or the surface hardness to be relatively low.

[0007] Preferably, an air extraction port is arranged on the cover body or the bottom shell, and the air extraction port is communicated with the accommodation cavity, so as to facilitate the extraction of air in the accommodation cavity and make the accommodation cavity form a vacuum. Arranging an air extraction port on the cover body or the bottom shell can extract the air in the accommodation cavity before introducing the reaction gas, and avoid the influence of air on the nitriding reaction.

[0008] Preferably, the laser nitriding device further includes a sensor and a controller. The sensor is disposed on the cover body or the bottom case, and the sensor can transmit the pressure information in the accommodation cavity to the controller. An inlet solenoid valve is arranged in the gas inlet, an outlet solenoid valve is arranged in the gas outlet, and an evacuation solenoid valve is arranged in the evacuation port. The controller can control the opening and closing of the inlet solenoid valve, the outlet solenoid valve, and the evacuation solenoid valve. Through the sensor, the controller, and the solenoid valves, automatic control of evacuation and nitrogen filling can be achieved, making the operation of workers more convenient.

[0009] Preferably, the laser nitriding device further includes a jig and a rotating device capable of driving the jig to rotate. At least part of the jig is rotatably arranged in the accommodation cavity, and the jig is detachably fixed with the workpiece to be processed. By driving the jig to rotate through the rotating device, the workpiece to be processed can be rotated slowly, and the surface of the workpiece to be processed can be scanned in a rotary manner by using the laser linear spot flame. In this way, the heating of the surface of the workpiece to be processed by the laser linear spot flame is more uniform, and the thickness of the generated laser nitriding layer is also more uniform.

[0010] Preferably, a cavity is arranged in the jig, and a cooling medium is filled in the cavity. Filling the cooling medium in the jig can prevent the temperature of the jig from rising too high and extend the service life of the jig.

[0011] Preferably, the rotation speed of the jig is 5 - 500 revolutions per minute. When the rotation speed is too small, it is easy to cause uneven thickness of the nitriding layer; when the rotation speed is too large, it is difficult to fix the workpiece to be processed on the jig, and higher requirements are imposed on the positioning device on the jig.

[0012] Preferably, the rotating device includes a positioner, and the positioner can adjust the angle of the workpiece to be processed. During the nitriding reaction process, the positioner automatically adjusts the angle of the workpiece to be processed, so that the laser linear spot flame irradiates the inner arc surface of the workpiece to be processed at a vertical radiation angle of nearly 90°, enabling as much energy as possible of the laser linear spot flame to be used for the nitriding reaction, improving the nitriding efficiency, and reducing energy waste.

[0013] Preferably, the power of the laser generator is 5000 - 30000W. When the power is less than 5000W, the time for laser nitriding needs to be increased, the production efficiency is reduced, and the thickness of the nitriding layer is also relatively thin, which cannot meet the requirements; when the power is greater than 30000W, the temperature of the laser linear spot flame generated by the laser generator is too high, which is easy to cause deformation of the workpiece to be processed, and at the same time, it may also change the internal structure of the material of the workpiece to be processed, affecting the performance of the cookware.

[0014] Preferably, the laser linear spot is a rectangular spot of 100×2mm or 40×2mm.

[0015] Preferably, a cylinder is provided on the cover body, and the cylinder can open or close the cover body. The automatic opening and closing of the cover body can be realized through the cylinder, which is convenient for workers to operate and reduces the labor intensity of workers.

[0016] Since the present utility model adopts the above technical solutions, it has remarkable technical effects: The present utility model protects a laser nitriding device. By generating a laser linear spot flame with a laser generator to irradiate the surface of a workpiece to be processed, the workpiece to be processed can be quickly heated for nitriding reaction. The device has a simple structure, high production efficiency, convenient operation, low labor intensity, and can process a nitriding layer with a thicker thickness and higher surface hardness. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the laser nitriding device in the present utility model.

[0018] The names of the parts referred to by each digital label in the drawings are as follows: 1 - cover body, 2 - bottom shell, 3 - accommodation cavity, 4 - laser generator, 5 - pot blank, 6 - fixture, 7 - gas inlet, 8 - gas outlet, 9 - inlet solenoid valve, 10 - outlet solenoid valve, 11 - air extraction port, 12 - air extraction solenoid valve, 13 - sensor, 14 - cylinder, 15 - frame, 16 - positioner, 17 - rotating device, 18 - cooling medium. Detailed Embodiment

[0019] The present utility model will be further described in detail below with reference to the drawings and embodiments.

[0020] As Figure 1 shown, an embodiment of a laser nitriding device is provided, taking the processing of a typical pot blank that needs to be nitrided on the surface of the workpiece as an example. The laser nitriding device includes a cover body 1 and a bottom shell 2, and the cover body 1 and the bottom shell 2 cooperate to form a closed accommodation cavity 3. A cylinder 14 is provided on the cover body 1, and driven by the cylinder 14, the cover body 1 can be automatically opened and closed, thereby improving the convenience of opening and closing the cover body and reducing the labor intensity of workers.

[0021] The laser nitriding device further includes a fixture 6 and a rotating device 17. One end of the rotating device 17 is connected to the fixture 6 and can drive the fixture 6 to rotate. The end of the fixture 6 away from the rotating device 17 is located in the accommodation cavity 3. A positioning device is provided on the fixture 6 located in the accommodation cavity 3, and the pot blank 5 is detachably fixed on the fixture 6 through the positioning device. The laser nitriding device further includes a laser generator 4 provided on the cover body 1 or the bottom shell 2. The laser generator 4 can be one or more. The laser generator 4 can generate a laser linear spot flame, and the laser linear spot flame irradiates the inner surface of the pot blank 5 at a certain angle, so that the inner surface of the pot blank 5 is heated, and laser nitriding treatment is carried out in the nitrogen atmosphere in the accommodation cavity 3.

[0022] The laser generator 4 has an automatic zoom function, and the laser linear spot flame it generates can be automatically zoomed. The laser generator 4 can automatically capture the rotating arc surface of the pot blank 5 and automatically adjust the focal length of the laser linear spot flame according to the rotating arc surface of the pot blank 5, so that the highest temperature point of the laser linear spot flame is always controlled on the inner arc surface of the pot blank 5. Moreover, the rotating device 17 further includes a positioner 16, and the positioner 16 can adjust the angle of the jig 6, thereby adjusting the angle at which the laser linear spot flame irradiates the inner surface of the pot blank 5. During actual use, the laser generator 4 generates a laser linear spot flame and automatically zooms so that the highest temperature point of the laser linear spot flame is always controlled on the arc surface of the pot blank 5. At the same time, the positioner 16 adjusts the angle of the pot blank 5 so that the laser linear spot flame and the inner surface of the pot blank 5 present a vertical radiation angle of nearly 90°. Under the combined action of the laser generator 4 and the positioner 16, the laser linear spot flame irradiates the inner surface of the pot blank 5 at an approximate vertical radiation angle of 90°, and the highest temperature point of the laser linear spot flame is always controlled on the arc surface of the pot blank 5. At this time, the efficiency of laser nitriding is relatively high, and energy waste can be avoided.

[0023] Preferably, a cavity is provided inside the jig 6, and a cooling medium 18 is filled in the cavity. The cooling medium 18 can be a coolant, or a solid or gaseous cooling medium. Filling the cooling medium in the jig 6 can prevent the temperature of the jig from rising too high and extend the service life of the jig.

[0024] Preferably, the power of the laser generator 4 is 5000 - 30000W. When the power is less than 5000W, the time for laser nitriding needs to be increased, the production efficiency is reduced, and the thickness of the nitrided layer is also relatively thin, which cannot meet the requirements; when the power is greater than 30000W, the temperature of the laser linear spot flame generated by the laser generator 4 is too high, which is likely to cause deformation of the pot blank 5, and may also change the internal structure of the material of the pot blank 5, affecting the performance of the cookware.

[0025] Preferably, the laser linear spot flame is a rectangular spot of 100×2mm or 40×2mm.

[0026] The laser nitriding device further includes a gas inlet 7 and a gas outlet 8 provided on the cover body 1 or the bottom shell 2. Both the gas inlet 7 and the gas outlet 8 communicate with the accommodation chamber 3 to introduce a flowing reaction gas into the accommodation chamber 3. A gas extraction port 11 is also provided on the cover body 1 or the bottom shell 2, and the gas extraction port 11 communicates with the accommodation chamber 3 to facilitate the extraction of air in the accommodation chamber 3 before introducing the reaction gas, preventing air from remaining in the accommodation chamber 3 and affecting the laser nitriding effect. The laser nitriding device further includes a sensor 13 and a controller. The sensor 13 is provided on the cover body 1 or the bottom shell 2. The sensor 13 can detect the pressure in the accommodation chamber 3 and transmit the pressure information in the accommodation chamber 3 to the controller. An inlet solenoid valve 9 is provided in the gas inlet 7, an outlet solenoid valve 10 is provided in the gas outlet 8, and a gas extraction solenoid valve 12 is provided in the gas extraction port 11. The controller can control the opening and closing of the inlet solenoid valve 9, the outlet solenoid valve 10, and the gas extraction solenoid valve 12.

[0027] Preferably, the reaction gas filled in the accommodation chamber 3 is high-purity nitrogen, or high-purity nitrogen and argon, or high-purity nitrogen and hydrogen. Different reaction gases can obtain different colors on the surface of the pot blank 5. Preferably, the flow rate of the reaction gas filled in the accommodation chamber 3 is 5 - 20 L / min. Introducing a flowing reaction gas into the accommodation chamber 3 can continuously supplement the reaction gas and provide sufficient raw materials for the nitriding reaction. When the flow rate of the reaction gas in the accommodation chamber 3 is less than 5 L / min, the reaction gas is insufficient, affecting the thickness and quality of the nitriding layer; when the flow rate of the reaction gas in the accommodation chamber 3 is greater than 20 L / min, there is no significant improvement in the thickness and quality of the nitriding layer.

[0028] Preferably, the rotation speed of the jig 6 is 5 - 500 revolutions per minute. The rotation speed can be adjusted frequency-variably according to the size of the pot blank 5. When the rotation speed is too small, it is easy to cause uneven thickness of the nitriding layer; when the rotation speed is too large, it is difficult to fix the pot blank 5 on the jig 6, and higher requirements are imposed on the positioning device on the jig 6.

[0029] Preferably, the laser nitriding device further includes a non-contact thermometer, which can monitor the temperature of the inner surface of the pot blank 5 in real time and feedback it to the controller for automatic control. The temperature of the inner surface of the pot blank is controlled at 1000 - 1200 °C. When the temperature of the inner surface of the pot blank is lower than 1000 °C, the nitriding reaction is insufficient and the thickness of the nitriding layer is relatively thin; when the temperature of the inner surface of the pot blank is higher than 1200 °C, it is easy to cause deformation of the pot blank 5 and changes in the internal structure of the material, reducing the qualification rate of the cookware.

[0030] Taking a single-layer titanium pot blank as an example, the process of laser nitriding treatment will be described in detail below.

[0031] The controller controls the cylinder 14 to rise to open the cover 1, fixes the pot blank 5 in the positioning device of the jig 6, and the cylinder 14 descends to close the cover 1. The controller controls the suction solenoid valve 12 to open, and pumps out the air in the accommodation chamber 3. When the sensor 13 detects that the air pressure in the accommodation chamber 3 is zero or close to zero, the suction solenoid valve 12 is closed, and the inlet solenoid valve 9 and the outlet solenoid valve 10 are opened to enter the automatic nitrogen filling program. The reaction gas filled can be high-purity nitrogen, or a mixture of high-purity nitrogen and argon, or high-purity nitrogen and hydrogen. When the sensor 13 detects that the flow rate of the reaction gas in the accommodation chamber 3 reaches the set value, the pot blank 5 starts to rotate at a speed of 5 - 500 revolutions per minute. At the same time, the laser generator 4 starts to emit a laser linear spot flame, and the laser linear spot flame automatically zooms in, so that the highest temperature point of the laser linear spot flame is always controlled on the inner arc surface of the pot blank 5. The laser linear spot flame scans the entire inner arc surface of the pot blank 5 or performs overlapping scanning. At the same time, during the laser scanning process, the positioner 16 automatically adjusts the angle of the pot blank 5, so that the laser linear spot irradiates the inner arc surface of the pot blank 5 at a vertical radiation angle of nearly 90°. The non-contact thermometer detects the temperature of the inner surface of the pot blank 5 in real time and transmits it to the controller to automatically control the temperature of the inner surface of the pot blank 5, so that the temperature of the inner surface of the pot blank 5 is controlled within the range of 1000 - 1200 °C. After 1 - 5 minutes of laser scanning, the buzzer sounds, the cover 1 automatically opens under the action of the cylinder 14, the pot blank 5 is taken off, and the laser nitriding is completed. The laser scanning time can be determined according to the power of the laser generator 4 and the thickness of the pot blank 5, and is preferably 1 - 5 minutes. When the laser scanning time is less than 1 minute, the thickness of the nitrided layer is relatively thin and it is difficult to meet the use requirements; when the laser scanning time is greater than 5 minutes, the production cost increases, but the increase in the thickness of the nitrided layer is limited.

[0032] After the above treatment, a laser titanium nitride layer with a thickness of 20 - 100 μm can be formed on the inner surface of the pot blank 5, and its surface Vickers hardness can reach HV1000 - 1500, and it can withstand long-term shoveling by a steel spatula.

[0033] Preferably, it further includes a frame 15 for placing the laser nitriding device.

[0034] In summary, the above are only the preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope covered by the patent of the present invention.

Claims

1. A laser nitriding device, characterized in that: It includes a cover body (1) and a bottom shell (2), the cover body (1) and the bottom shell (2) cooperate to form a sealed accommodation cavity (3), the accommodation cavity (3) is filled with reaction gas, and a laser generator (4) is provided on the cover body (1) or the bottom shell (2), and the laser generator (4) is used to generate a laser linear spot flame, and the laser linear spot flame is directly irradiated on the surface of the pot blank; the laser nitriding device further includes a jig (6) and a rotating device (17) that can drive the jig (6) to rotate, at least part of the jig (6) is rotatably arranged in the accommodation cavity (3), and the jig (6) detachably fixes the pot blank; a cavity is provided in the jig (6), and a cooling medium (18) is filled in the cavity, and the rotating device (17) includes a positioner (16), and the positioner (16) can adjust the angle of the pot blank.

2. The laser nitriding device according to claim 1, characterized in that: A gas inlet (7) and a gas outlet (8) are provided on the cover body (1) or the bottom shell (2), and both the gas inlet (7) and the gas outlet (8) are communicated with the accommodation cavity (3) so as to introduce flowing reaction gas into the accommodation cavity (3).

3. The laser nitriding device according to claim 2, characterized in that: An air extraction port (11) is provided on the cover body (1) or the bottom shell (2), and the air extraction port (11) is communicated with the accommodation cavity (3) so as to facilitate the extraction of air in the accommodation cavity (3).

4. The laser nitriding device according to claim 3, characterized in that: It further includes a sensor (13) and a controller. The sensor (13) is provided on the cover body (1) or the bottom shell (2), and the sensor (13) can transmit the pressure information in the accommodation cavity (3) to the controller. An inlet solenoid valve (9) is provided in the gas inlet (7), an outlet solenoid valve (10) is provided in the gas outlet (8), and an air extraction solenoid valve (12) is provided in the air extraction port (11), and the controller can control the opening and closing of the inlet solenoid valve (9), the outlet solenoid valve (10) and the air extraction solenoid valve (12).

5. The laser nitriding device according to claim 1, characterized in that: The rotation speed of the jig (6) is 5 - 500 revolutions per minute.

6. The laser nitriding device according to claim 1, characterized in that: The power of the laser generator is 5000 - 30000W.

7. The laser nitriding device according to claim 1, characterized in that: The laser linear spot flame is a rectangular spot of 100×2mm or 40×2mm.

8. The laser nitriding device according to claim 1, characterized in that: A cylinder (14) is provided on the cover body (1), and the cylinder (14) can open or close the cover body (1).

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