Temperature control assisted ultrasonic surface nanocrystallization GH3536 welding structure device and application method

Abstract

The invention relates to the technical field of metal surface machining strengthening, in particular to a temperature control auxiliary ultrasonic surface nanocrystallization device for a GH3536 welding structure and an application method of the temperature control auxiliary ultrasonic surface nanocrystallization device. The device comprises an ultrasonic surface nanocrystallization processing execution device, an infrared heating device and an ultrasonic surface nanocrystallization processing control cabinet, a PIC temperature control box in the infrared heating device is connected with the special fixture through a temperature sensor and used for monitoring and controlling the machining temperature. The ultrasonic surface nanocrystallization machining execution device comprises a transducer, an amplitude-change pole and an ultrasonic surface nanocrystallization machining tool, and the vibration power of the ultrasonic surface nanocrystallization machining execution device is controlled by a numerical control panel of the ultrasonic surface nanocrystallization machining control cabinet; according to the method, the infrared heating technology and the ultrasonic surface nanocrystallization technology are combined, the surface hardness and abrasion resistance of the GH3536 alloy are remarkably improved, a surface hardened layer is deepened, the microscopic structure is refined, and the fatigue life of the material is greatly prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of metal surface processing and strengthening, and in particular to a temperature control-assisted ultrasonic surface nano-crystallization device for a GH3536 welding structure and an application method thereof. Background Art

[0002] GH3536 is a nickel-based high-temperature alloy with a high iron content that is solid-solution strengthened by chromium and molybdenum. Due to its excellent oxidation resistance, corrosion resistance, hot and cold processing formability and welding performance, it is widely used in the manufacture of turbine blades for aviation, navigation and gas turbines, as well as aerospace engine parts. With the continuous advancement of aerospace technology, higher requirements are placed on the material properties of engine parts, especially the hardness, wear resistance and corrosion resistance of the materials. Traditional processing technology is difficult to meet these high-performance requirements in some cases, so it is necessary to explore new or improved processing technology to further improve the performance of GH3536 alloy.

[0003] As an advanced surface strengthening technology, ultrasonic surface nano-crystallization causes plastic deformation of the metal surface through ultrasonic impact, thereby reducing surface roughness, refining microstructure, and significantly improving material hardness. This process has shown significant effects at room temperature, but in some specific applications, ultrasonic surface nano-crystallization at room temperature may not fully meet the high requirements for material performance.

[0004] In recent years, studies have shown that ultrasonic surface nano-processing under high temperature conditions can further optimize the surface properties of materials. Especially for high-hardness metals such as GH3536 alloy, ultrasonic surface nano-processing under high temperature environment can induce stronger plastic deformation, thereby improving the microstructure and mechanical properties of the material at a deeper level. However, there is currently a lack of a processing device on the market that can effectively combine temperature control and ultrasonic surface nano-processing technology to achieve precise processing and performance improvement of high-performance alloy materials such as GH3536. Summary of the invention

[0005] The present invention aims to solve the above problems and provide a device and application method for temperature control-assisted ultrasonic surface nano-processing of GH3536 welding structure; by precisely controlling the temperature during the processing and combining the advantages of ultrasonic surface nano-processing technology, the hardened layer on the surface of the material is further deepened, and the hardness and wear resistance of the material are improved to meet the stringent requirements of high-end fields such as aerospace on material performance.

[0006] The technical solution adopted by the present invention is: a device for temperature control-assisted ultrasonic surface nano-processing of GH3536 welding structure, which mainly combines ultrasonic surface nano-processing technology and temperature control technology to perform surface strengthening treatment on the welding structure of GH3536, a nickel-based high-temperature alloy, to improve its material properties and wear resistance. The device includes an ultrasonic surface nano-processing execution device, an infrared heating device and an ultrasonic surface nano-processing control cabinet; the PIC temperature control box in the infrared heating device is connected to a special fixture through a temperature sensor to monitor and control the processing temperature; the ultrasonic surface nano-processing execution device includes a transducer, a horn and an ultrasonic surface nano-processing tool, and its vibration power is controlled by a numerical control panel of the ultrasonic surface nano-processing control cabinet.

[0007] The ultrasonic surface nano-machining execution device is connected to the ultrasonic surface nano-machining control cabinet through a cable, and is also connected to the oil pump and the air pressure pump of the control cabinet to achieve the functions of lubrication and providing static load.

[0008] The infrared heating device comprises a special clamp, a PIC temperature control box and an infrared heating lamp connected and controlled by the PIC temperature control box.

[0009] The special fixture is box-shaped and is used to clamp workpieces and wrap infrared heating lamps.

[0010] The temperature control box is equipped with a thermocouple which is in contact with a special fixture and is used to monitor the temperature of the workpiece in real time.

[0011] The infrared heating lamp tube is wrapped by high temperature resistant heat insulating material.

[0012] The heating member in the infrared heating device is in direct contact with the metal surface.

[0013] The application method of the device using the temperature control-assisted ultrasonic surface nano-processing GH3536 welding structure comprises the following steps:

[0014] a) Install the special fixture on the fixed chuck of the CNC machine tool, and fix the metal workpiece to be processed on the special fixture;

[0015] b) Place the infrared heating tube in a box-shaped special fixture;

[0016] c) installing the ultrasonic surface nano-machining tool on a CNC machine tool, regulating the vibration power of the machining tool through an ultrasonic surface nano-machining control cabinet, and aligning the tool with the workpiece to be machined;

[0017] d) Set the tool feed rate and spindle speed through the CNC panel of the CNC machine tool, set the load size during the processing through the air pressure pump on the control cabinet, and lubricate the processing tool through the oil pump of the control cabinet;

[0018] e) The infrared heating tube is controlled by the PIC temperature control box to heat the workpiece to be processed. After the workpiece is heated to the required temperature, it is kept warm and then subjected to ultrasonic surface nano-processing;

[0019] f) After processing, remove the processed workpiece and place it in an open area for air cooling.

[0020] In step e), the heating temperature ranges from 20°C to 400°C.

[0021] In step f), the workpiece is removed immediately after processing and air-cooled to achieve rapid cooling.

[0022] The technical effect achieved by the present invention is: by combining infrared heating technology and ultrasonic surface nano-crystallization technology, the present invention not only significantly improves the surface hardness and wear resistance of GH3536 alloy, but also deepens the surface hardening layer, refines the microstructure, and greatly improves the fatigue life of the material. At the same time, the device of the present invention has the advantages of temperature controllability, strong compatibility and easy operation, and provides a new and efficient processing method for the field of metal surface processing and strengthening; the specific embodiment is as follows:

[0023] (I) Significantly improve material hardness: The surface hardness of GH3536 alloy is significantly improved by infrared heating assisted ultrasonic surface nano-treatment. Under the conditions of the embodiment, the surface hardness is increased by 36.6% compared with the normal temperature ultrasonic surface nano-treatment, thereby enhancing the wear resistance and fatigue resistance of the material.

[0024] (ii) Deepening the surface hardened layer: The present invention increases the depth of the hardened layer on the surface of the material. Compared with conventional methods, the thickness of the deformation layer is increased by 20.0%, which means that the overall strength and durability of the material are significantly improved, especially in high stress environments.

[0025] Refinement of microstructure: Ultrasonic surface nano-processing assisted by infrared heating can more effectively refine the microstructure of the material. This refinement not only improves the mechanical properties of the material, but also improves its surface finish and corrosion resistance.

[0026] (III) Improved fatigue life: Through the treatment method of the present invention, the fatigue life of GH3536 alloy has been significantly improved. Under high stress levels, the fatigue life of the material has been increased by 3.97 times; under low stress levels, it has also been increased by 1.09 times. This is of great significance for improving the reliability and safety of key components such as aerospace engines.

[0027] (iv) Temperature controllability: The device of the present invention can achieve continuous control of temperature in the range of 20°C to 400°C, providing flexible processing conditions for different materials and different processing requirements, and optimizing the processing effect.

[0028] (V) Compatibility and ease of operation: The device of the present invention has a simple structure, is easy to operate, and is compatible with various plate-like metal components, providing wide applicability for industrial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the temperature-controlled heating-assisted ultrasonic surface nano-crystallization device of the present invention;

[0030] Figure 2 This is a comparison diagram of the microhardness of the material surface under different processing parameters of the present invention;

[0031] Figure 3 This is a metallographic microscope image of a material cross section without ultrasonic surface nano-crystallization under conventional conditions;

[0032] Figure 4 A metallographic microscope image of a material cross section after infrared heating-assisted ultrasonic rolling using the present invention;

[0033] Figure 5 The microhardness distribution diagram along the cross-section depth direction of the material surface nano-processed at room temperature and the material surface nano-processed by infrared heating assisted ultrasonic treatment;

[0034] Figure 6 The fatigue life diagram of the material without ultrasonic surface nano-processing and the material with ultrasonic surface nano-processing assisted by infrared heating of the present invention;

[0035] Notes on the attached figures: 1-air pressure pump of ultrasonic surface nano-processing control cabinet, 2-ultrasonic surface nano-processing control cabinet, 3-oil pump of ultrasonic surface nano-processing control cabinet, 4-CNC machine tool, 5-electric cable, 6-temperature sensor, 7-ultrasonic surface nano-processing tool, 8-workpiece to be processed, 9-special fixture, 10-PIC temperature control box. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0037] like Figure 1-6 As shown, Figure 1The figure is a schematic diagram of the overall structure of the temperature-controlled heating-assisted ultrasonic surface nano-processing device of the present invention. The figure shows in detail the arrangement and connection method of the ultrasonic surface nano-processing execution device, the infrared heating device and the ultrasonic surface nano-processing control cabinet. The ultrasonic surface nano-processing execution device is connected to the ultrasonic surface nano-processing control cabinet (2) through a cable (5), and is also connected to the oil pump (3) and the air pressure pump (1) of the control cabinet to provide lubrication and static load. The infrared heating device includes a special fixture (9), a PIC temperature control box (10) and an infrared heating lamp, wherein the PIC temperature control box is connected to the special fixture through a temperature sensor (6) for monitoring and controlling the processing temperature. Figure 2 The figure is a comparison of the microhardness of the material surface under different processing parameters. The figure clearly shows the influence of high-temperature ultrasonic surface nano-crystallization and room-temperature ultrasonic surface nano-crystallization on the surface hardness of the material, as well as the significant improvement of the surface hardness of the material under the embodiment of the present invention. Figure 3 This is a metallographic microscope image of a material cross section that has not been subjected to conventional ultrasonic surface nano-processing. This image shows the microstructural state of the untreated material cross section as a comparison benchmark. Figure 4 This is a metallographic microscope image of a material cross section after infrared heating-assisted ultrasonic rolling using the present invention. Figure 3 By comparison, it can be clearly seen that the cross-sectional microstructure of the material treated by the present invention is significantly refined, the deformation layer is thicker, and the deformation degree of the material is greater. Figure 5 The figure shows the microhardness distribution of the material along the cross-section depth direction after surface nano-processing at room temperature and after surface nano-processing assisted by infrared heating and ultrasonic treatment. The figure intuitively shows the change of the material microhardness with the cross-section depth under the two treatment methods, and the effect of the present invention that the material undergoes stronger plastic deformation under high temperature, thereby deepening the deformation layer. Figure 6 This is an experimental demonstration diagram, which shows the fatigue life of materials without ultrasonic surface nano-processing and with ultrasonic surface nano-processing assisted by infrared heating of the present invention; this fully proves the remarkable effect of the present invention in improving the fatigue life of materials.

[0038] A specific implementation of a device for temperature control-assisted ultrasonic surface nano-processing of GH3536 welding structure, such as Figure 1As shown, it includes an ultrasonic surface nano-processing execution device, an infrared heating device and an ultrasonic surface nano-processing control cabinet 2. Among them, the PIC temperature control box 10 in the infrared heating device is connected to the special fixture 9 through a temperature sensor 6, which is used to monitor and accurately control the processing temperature. The ultrasonic surface nano-processing execution device is composed of a transducer, a horn and an ultrasonic surface nano-processing tool 7. The vibration power of the tool 7 can be finely controlled by the numerical control panel of the ultrasonic surface nano-processing control cabinet 2. The ultrasonic surface nano-processing execution device is connected to the ultrasonic surface nano-processing control cabinet 2 through a cable 5, and is connected to the oil pump 3 and the air pressure pump 1 in the control cabinet 2 to ensure lubrication during the processing and provide the necessary static load. The infrared heating device includes a special fixture 9, a PIC temperature control box 10 and an infrared heating lamp controlled by the PIC temperature control box. The lamp is placed in the special fixture 9 and is used to uniformly heat the workpiece.

[0039] The special fixture 9 is designed in a box shape, which is not only used to firmly clamp the workpiece 8 to be processed, but also can effectively wrap the infrared heating lamp to ensure heating efficiency and uniformity. The temperature sensor 6 (i.e., thermocouple) is installed on the contact surface of the special fixture 9 to monitor the temperature of the workpiece 8 in real time to ensure accurate control of the processing temperature.

[0040] The processing method of the temperature control-assisted ultrasonic surface nano-crystallization GH3536 welding structure using the above device is as follows:

[0041] Step S1: Install the special fixture 9 on the fixed chuck of the CNC machine tool 4, and firmly clamp the metal workpiece 8 to be processed in the special fixture 9.

[0042] Step S2: Place the infrared heating lamp tube in the box-shaped special fixture 9 to ensure uniform contact between the heating lamp tube and the workpiece 8.

[0043] Step S3: Install the ultrasonic surface nano-machining tool 7 on the CNC machine tool, and set the vibration power of the tool 7 through the CNC panel of the ultrasonic surface nano-machining control cabinet 2. Then, perform tool alignment between the tool 7 and the workpiece 8 to be processed to ensure the processing accuracy.

[0044] Step S4: Set the feed rate of the tool and the spindle speed through the numerical control panel of the numerical control machine tool 4. At the same time, set the static load size during the processing through the air pressure pump 1 on the control cabinet 2, and fully lubricate the processing tool through the oil pump 3 to reduce friction and wear during the processing.

[0045] Step S5: Start the infrared heating device, and the PIC temperature control box 10 controls the infrared heating lamp to heat the workpiece 8. When the workpiece 8 reaches the preset processing temperature, it is kept warm for a period of time to ensure the uniform distribution of the workpiece temperature. Then, the ultrasonic surface nano-processing can be started.

[0046] Step S6: After the processing is completed, the processed workpiece 8 is removed from the special fixture 9 and placed in an open area for natural air cooling to ensure the stability of the workpiece performance.

[0047] In this embodiment, the air pump 1 of the ultrasonic surface nano-machining control cabinet 2 is connected to the ultrasonic surface nano-machining execution device through an air pressure pipe to provide a stable static load for the machining process. At the same time, the pressure regulating valve on the air pressure pipe is used to accurately measure and control the load size.

[0048] In order to verify the effectiveness of the present invention, a GH3536 plate treated with welding was selected as the processing object, and the temperature control-assisted ultrasonic surface nano-processing device was used for processing. The processing parameters are as follows: the length of the GH3536 plate is 210 mm, the vibration output power of the ultrasonic surface nano-processing actuator is set to 30%, the feed rate is set to 0.1 mm / r, the heating temperature is controlled at 250 ° C, and the static load is 0.3 MPa. The entire processing process is precisely controlled by a CNC machine tool.

[0049] The processing results show that compared with the ultrasonic surface nano-processing at room temperature, the high-temperature ultrasonic surface nano-processing of the present invention significantly improves the surface hardness of the workpiece. Specifically, the surface hardness is increased from 366.4HV at room temperature to 500.4HV, an increase of about 36.6%. For details, see Figure 2 .

[0050] like Figure 3 and 4 As shown, through metallographic microscope observation, it is found that the grains of the GH3536 plate processed by the present invention are significantly refined, the deformation layer is thicker, and the deformation degree of the material is greater. This shows that ultrasonic surface nano-treatment at high temperature can more effectively promote the plastic deformation of the material and the refinement of the microstructure.

[0051] In addition, the microhardness test along the depth direction of the cross section is detailed in Figure 5 , also shows that the thickness of the deformation layer of the workpiece processed by the present invention is increased from 750.0μm to 900.0μm, an increase of about 20.0%. This shows that ultrasonic surface nano-treatment at high temperature can deepen the hardening layer depth of the material, thereby improving the overall performance of the material.

[0052] Finally, fatigue life testing, Figure 6It shows that the fatigue life of the workpiece processed by the present invention is increased from 29487 cycles to 146617 cycles at a high stress level of 600MPa, an increase of about 3.97 times; the fatigue life is increased from 89578 cycles to 187643 cycles at a low stress level of 500MPa, an increase of about 1.09 times. This fully proves the remarkable effect of the present invention in improving the fatigue life of materials.

[0053] In summary, the device and application method of the temperature control-assisted ultrasonic surface nano-crystallization GH3536 welding structure provided by the present invention can not only effectively improve the surface hardness and wear resistance of the material, but also significantly deepen the hardened layer depth of the material and improve the fatigue life of the material. Therefore, the present invention has broad application prospects and important practical value in the field of metal surface processing and strengthening technology.

Claims

1. A device for temperature control-assisted ultrasonic surface nano-processing of GH3536 welding structure, characterized in that: The device comprises an ultrasonic surface nano-processing execution device, an infrared heating device and an ultrasonic surface nano-processing control cabinet; the PIC temperature control box in the infrared heating device is connected to a special fixture through a temperature sensor to monitor and control the processing temperature; the ultrasonic surface nano-processing execution device comprises a transducer, a horn and an ultrasonic surface nano-processing tool, and its vibration power is controlled by a numerical control panel of the ultrasonic surface nano-processing control cabinet.

2. The device for temperature control-assisted ultrasonic surface nano-processing of GH3536 welding structure according to claim 1, characterized in that: The ultrasonic surface nano-machining execution device is connected to the ultrasonic surface nano-machining control cabinet through a cable, and is also connected to the oil pump and the air pressure pump of the control cabinet to achieve the functions of lubrication and providing static load.

3. The device for temperature control-assisted ultrasonic surface nano-processing of GH3536 welding structure according to claim 1, characterized in that: The infrared heating device comprises a special clamp, a PIC temperature control box and an infrared heating lamp connected and controlled by the PIC temperature control box.

4. The device for temperature control-assisted ultrasonic surface nano-processing of GH3536 welding structure according to claim 3 is characterized in that: The special fixture is box-shaped and is used to clamp workpieces and wrap infrared heating lamps.

5. The device for temperature control-assisted ultrasonic surface nano-processing of GH3536 welding structure according to claim 1, characterized in that: The temperature control box is equipped with a thermocouple which is in contact with a special fixture and is used to monitor the temperature of the workpiece in real time.

6. The device for temperature control-assisted ultrasonic surface nano-processing of GH3536 welding structure according to claim 3, characterized in that: The infrared heating lamp tube is wrapped by high temperature resistant heat insulating material.

7. The device for temperature control-assisted ultrasonic surface nano-processing of GH3536 welding structure according to claim 1, characterized in that: The heating member in the infrared heating device is in direct contact with the metal surface.

8. An application method of the device for temperature control-assisted ultrasonic surface nano-crystallization of GH3536 welding structure according to any one of claims 1 to 7, characterized in that: The following steps are involved: a) Install the special fixture on the fixed chuck of the CNC machine tool, and fix the metal workpiece to be processed on the special fixture; b) Place the infrared heating tube in a box-shaped special fixture; c) installing the ultrasonic surface nano-machining tool on a CNC machine tool, regulating the vibration power of the machining tool through an ultrasonic surface nano-machining control cabinet, and aligning the tool with the workpiece to be machined; d) Set the tool feed rate and spindle speed through the CNC panel of the CNC machine tool, set the load size during the processing through the air pressure pump on the control cabinet, and lubricate the processing tool through the oil pump of the control cabinet; e) The infrared heating tube is controlled by the PIC temperature control box to heat the workpiece to be processed. After the workpiece is heated to the required temperature, it is kept warm and then subjected to ultrasonic surface nano-processing; f) After processing, remove the processed workpiece and place it in an open area for air cooling.

9. The application method according to claim 8, characterized in that: In step e), the heating temperature ranges from 20°C to 400°C.

10. The application method according to claim 8, characterized in that: In step f), the workpiece is removed immediately after processing and air-cooled to achieve rapid cooling.

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