Ultrasonic impact strengthening device and method for improving fatigue strength of aluminum alloy hub of new energy automobile

Abstract

The invention provides an ultrasonic impact strengthening device and method for improving the fatigue strength of an aluminum alloy hub of a new energy automobile. According to the new energy automobile aluminum alloy hub ultrasonic impact strengthening device and method, ultrasonic impact strengthening of the spoke area and the rim area of the aluminum alloy hub can be rapidly achieved, the working efficiency is high, the equipment investment is small, the manufacturing cost is low, and the process applicability is high; the method can be used for surface strengthening of aluminum alloy hubs of various complex structures in the new energy automobile industry in China, the fatigue strength of the aluminum alloy hubs is improved, the service life of the aluminum alloy hubs is prolonged, the stress corrosion resistance of the aluminum alloy hubs is improved, the surface smoothness of the aluminum alloy hubs subjected to ultrasonic impact strengthening is effectively improved, the surface attractiveness of the aluminum alloy hubs is improved, and the service life of the aluminum alloy hubs is prolonged. And the controllability, the stability and the safety of the new energy automobile are obviously improved.

Description

Technical Field

[0001] The present invention belongs to the field of manufacturing technology and technology of new energy vehicle structural parts, and specifically relates to an ultrasonic impact strengthening device and method for improving the fatigue strength of an aluminum alloy wheel hub of a new energy vehicle. Background Art

[0002] In the field of automotive engineering, the wheel hub is an important component that connects the vehicle to the road, and its performance is directly related to the vehicle's handling, safety, and driving quality control. First, the wheel hub supports the weight of the entire vehicle and transfers the weight of the vehicle to the road, bearing various forces during the vehicle's driving process, such as lateral loads, driving force, and braking torque when the vehicle turns; secondly, the wheel hub is the part where the axle is installed, which can buffer the external impact of the vehicle, ensure the vehicle's driving performance, and keep the tire in good contact with the road. As a traditional and economical steel wheel hub, it is known for its high strength and long durability, and can withstand large loads and impacts, but its weight is relatively large, which will affect the handling and driving distance of new energy vehicles. At the same time, the heat dissipation and rust prevention of the steel wheel hub also need regular maintenance, which limits its application scenarios.

[0003] As the most popular wheel hub material on the market, aluminum alloy wheels are known for their lightweight properties, which can reduce the total weight of the car, thereby improving the driving distance and handling of new energy vehicles. The excellent thermal conductivity of aluminum alloy materials also helps the heat dissipation of the wheel hub, and the corrosion resistance is significantly improved compared to steel wheels. Unlike fuel vehicles, new energy vehicles are driven by electric energy. The vehicle accelerates quickly at the start stage and has a short braking distance during driving. The wheel hub, as a load-bearing structural component that bears the total weight of the vehicle body, needs to continuously withstand tensile-compressive impact loads during service. In addition, as a means of transportation, new energy vehicles often need to be used for a long time, so higher fatigue strength technical indicators are required for new energy vehicle wheels.

[0004] At present, the manufacturing processes for improving the fatigue strength of new energy vehicle hubs mainly include surface strengthening and extrusion strengthening. Extrusion strengthening is to extrude the center hole and other areas of the hub through an extrusion rod to introduce a layer of residual compressive stress layer on the surface of the material, thereby improving the fatigue strength and service life of the new energy vehicle hub; but extrusion strengthening will destroy the structural dimensions of the aluminum alloy hub, making the aluminum alloy hub unable to be installed and used. The surface strengthening process mainly includes surface shot peening, surface laser shock strengthening and surface ultrasonic shock strengthening. As a traditional surface strengthening process, shot peening has the advantages of simple operation, strong process applicability and good effect. However, during surface shot peening, the projectile will form a large number of craters of different sizes on the surface of the part, and the surface roughness of the part is large, so surface treatment processes such as anodizing cannot be performed. Surface laser shock strengthening is an advanced surface strengthening technology. It uses high-energy laser pulses to impact the surface of the material, generate residual compressive stress on the surface of the material, and improve the fatigue strength, crack propagation resistance and corrosion resistance of the material. However, aluminum alloy is a metal material with excellent thermal conductivity. When the surface of the material absorbs high-energy pulse laser during laser shock strengthening, it will cause a sharp rise in the temperature of the surface material, exceeding the heat resistance limit of the material, causing the microstructure of the surface material to be destroyed and damaged, affecting the service life of the aluminum alloy wheel. Ultrasonic impact technology is an efficient method to eliminate harmful residual tensile stress on the surface of components or welds and introduce beneficial compressive stress. Ultrasonic impact equipment usually uses high-power energy to drive the impact head to impact the surface of metal objects at a frequency of about 20,000 times per second. The high frequency, high efficiency and high energy under focus cause large compressive plastic deformation of the metal surface. At the same time, ultrasonic impact changes the original stress field and generates beneficial compressive stress. Under high-energy impact, the surface temperature of the metal rises rapidly and cools rapidly, causing the surface metal structure of the action area to change, and the impact part is strengthened. It can be seen that ultrasonic impact strengthening is a surface treatment technology. Through the high-frequency vibration generated by ultrasonic waves, the impact gun generates high-frequency vibration impact on the surface of the workpiece, produces severe plastic deformation on the surface of the part, introduces residual stress, and effectively improves the fatigue strength and stress corrosion resistance of the part. The working principle of ultrasonic impact strengthening is that the power system generates a high-frequency electrical signal, the transducer converts the high-frequency electrical signal into mechanical vibration, the amplitude transformer amplifies the amplitude of the mechanical vibration, and the impact gun converts the vibration energy into impact force to act on the surface of the part. Through severe plastic deformation, a residual compressive stress layer is formed on the surface of the part, which improves the fatigue strength and stress corrosion resistance of the part, thereby improving the material properties of the part. Summary of the invention

[0005] The purpose of the present invention is to improve the fatigue strength, service life and stress corrosion resistance of aluminum alloy wheels of new energy vehicles, and proposes an ultrasonic impact strengthening device and method for improving the fatigue strength of aluminum alloy wheels of new energy vehicles. Compared with the existing surface shot peening and surface laser shock strengthening manufacturing processes, the preparation method of the present invention has the characteristics of simple operation, low manufacturing cost, low environmental pollution, strong process applicability, fast processing speed, high production efficiency and high surface finish of the wheel hub. The present invention is to perform ultrasonic impact strengthening on the spoke area and rim area of ​​the aluminum alloy wheel hub, specifically, to perform ultrasonic impact strengthening covering the entire area along the inner cavity surface of the spoke area of ​​the aluminum alloy wheel hub and the outer side surface of the rim area.

[0006] The ultrasonic impact strengthening device and preparation method of the aluminum alloy wheel hub for new energy vehicles described in the present invention can quickly realize the ultrasonic impact strengthening of the spoke area and rim area of ​​the aluminum alloy wheel hub with complex structure, and significantly improve the fatigue strength and stress corrosion resistance of the aluminum alloy wheel hub for new energy vehicles; the surface roughness of the obtained aluminum alloy wheel hub is Ra ≤0.8μm, stress corrosion fracture toughness of aluminum alloy wheel hub KISCC≥16MPa·m 1 / 2 The fatigue strength of the aluminum alloy wheel hub is increased by more than 20%, which significantly increases the service life of the aluminum alloy wheel hub of new energy vehicles and improves the handling, stability and safety of new energy vehicles.

[0007] The object of the present invention is achieved through the following technical solutions: An ultrasonic impact strengthening device, characterized in that the device comprises a device base, a spoke strengthening unit, a rim strengthening unit and an aluminum alloy hub fixing unit; The spoke strengthening unit includes a spoke strengthening support rod, a spoke strengthening support rod displacement drive motor, a spoke strengthening left and right displacement positioner, a spoke strengthening left and right displacement support rod, and a spoke strengthening structural member; the spoke strengthening support rod is connected to the equipment base; the spoke strengthening left and right displacement support rod is connected to the spoke strengthening support rod; the spoke strengthening support rod displacement drive motor is arranged at the rear end of the spoke strengthening left and right displacement support rod; the spoke strengthening left and right displacement positioner is connected to the spoke strengthening left and right displacement support rod; the spoke strengthening structural member is connected to the spoke strengthening left and right displacement support rod through the spoke strengthening left and right displacement positioner; the spoke strengthening structural member is used to realize ultrasonic impact strengthening of the spoke area of ​​the aluminum alloy wheel hub; the rim strengthening unit includes a rim strengthening structural member, a rim strengthening support rod displacement drive motor, a rim strengthening support rod, displacement amplitude modulator and displacement amplitude modulator clamping fixture; the displacement amplitude modulator is connected to the equipment base; the displacement amplitude modulator clamping fixture is located above the displacement amplitude modulator and connects the rim reinforcement structure and the displacement amplitude modulator; the rim reinforcement support rod is connected to the equipment base; one end of the rim reinforcement support rod is connected to the rim reinforcement support rod displacement drive motor, and the other end is connected to the rim reinforcement structure; the rim reinforcement structure is used to achieve ultrasonic impact strengthening of the rim area of ​​the aluminum alloy wheel hub; the aluminum alloy wheel hub fixing unit includes a differential support seat, a differential, a differential speed regulating drive shaft and an aluminum alloy wheel hub fixing structure; the differential support seat is connected to the equipment base, and the differential support seat is connected to the differential speed regulating drive shaft through the differential; an aluminum alloy wheel hub fixing structure is arranged above the differential speed regulating drive shaft.

[0008] Beneficial effects: The present invention proposes an ultrasonic impact strengthening device and method for improving the fatigue strength of aluminum alloy wheel hubs for new energy vehicles. Compared with the surface shot peening strengthening process, the ultrasonic impact strengthening of the present invention does not require high-speed impact of projectiles, has low environmental pollution, no noise pollution and dust pollution, and will not produce micro-craters on the surface of the aluminum alloy wheel hub. After the aluminum alloy wheel hub is treated with ultrasonic impact strengthening, the surface finish is high and the manufacturing cost is low. Compared with the laser impact strengthening process, the ultrasonic impact strengthening of the present invention does not produce a high-energy temperature field, will not cause a rapid temperature rise on the surface of the aluminum alloy wheel hub, and will not destroy the material microstructure on the surface of the aluminum alloy wheel hub; the ultrasonic impact strengthening device of the present invention has small equipment investment, simple operation and low manufacturing cost.

[0009] The working mode of the spoke strengthening impact gun and the rim strengthening impact gun of the present invention is a multi-point mold. A large number of impact heads can be close to the spoke area and rim area of ​​the aluminum alloy wheel hub during ultrasonic impact strengthening, and 100% full coverage ultrasonic impact strengthening can be performed, introducing a deep residual compressive stress layer on the surface of the aluminum alloy wheel hub, thereby significantly improving the fatigue strength of the aluminum alloy wheel hub.

[0010] The ultrasonic impact strengthening device and method for the aluminum alloy wheel hub of new energy vehicles of the present invention can quickly realize ultrasonic impact strengthening of the spoke area and rim area of ​​the aluminum alloy wheel hub, with high working efficiency, small equipment investment, low manufacturing cost and strong process applicability. It can be used for the surface strengthening of aluminum alloy wheels with various complex structures in my country's new energy vehicle industry, improve the fatigue strength, service life and stress corrosion resistance of the aluminum alloy wheel hub, and the surface finish of the aluminum alloy wheel hub after ultrasonic impact strengthening is effectively improved, thereby improving the surface aesthetics of the aluminum alloy wheel hub and significantly improving the handling, stability and safety of new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of an ultrasonic impact strengthening device for improving the fatigue strength of an aluminum alloy wheel hub for new energy vehicles, as shown in a preferred embodiment of the present invention.

[0012] Figure 2 This is a schematic structural diagram of an ultrasonic impact strengthening device for improving the fatigue strength of an aluminum alloy wheel hub for new energy vehicles, as shown in a preferred embodiment of the present invention.

[0013] Figure 3 This is a schematic structural diagram of an ultrasonic impact strengthening device for improving the fatigue strength of an aluminum alloy wheel hub for new energy vehicles, as shown in a preferred embodiment of the present invention.

[0014] Figure 4 This is a schematic diagram of the working principle of a multi-point mold for strengthening the rim area of ​​an aluminum alloy wheel hub for new energy vehicles, shown as a preferred embodiment of the present invention.

[0015] Figure 5 A schematic diagram of the working principle of a multi-point mold for strengthening the spoke area of ​​an aluminum alloy wheel hub for new energy vehicles shown in a preferred embodiment of the present invention.

[0016] Figure 6 This is a physical schematic diagram of the aluminum alloy wheel hub for new energy vehicles prepared in Example 3.

[0017] Figure 7 This is a physical schematic diagram of the aluminum alloy wheel hub for new energy vehicles prepared in Example 4.

[0018] Figure 8 This is a physical schematic diagram of the aluminum alloy wheel hub for new energy vehicles prepared in Example 5.

[0019] Figure numerals: 1 is the equipment base; 2 is the spoke-reinforced support rod fastening nut; 3 is the spoke-reinforced support rod; 4 is the spoke-reinforced support rod displacement drive motor; 5 is the spoke-reinforced left and right displacement positioner; 6 is the spoke-reinforced left and right displacement support rod; 7 is the spoke-reinforced power supply system; 8 is the spoke-reinforced transducer; 9 is the spoke-reinforced amplitude rod; 10 is the spoke-reinforced angle adjuster; 11 is the spoke-reinforced impact gun; 12 is the differential support seat; 13 is the differential support seat fastening nut; 14 is the differential; 15 is the differential speed regulation driving shaft; 16 is a rim strengthening impact gun; 17 is a rim strengthening amplitude rod; 18 is a rim strengthening transducer; 19 is a rim strengthening power supply system; 20 is a rim strengthening support rod displacement driving motor; 21 is a rim strengthening support rod; 22 is a rim strengthening support rod fastening nut; 23 is a displacement amplitude modulator; 24 is a displacement amplitude modulator clamp; 25 is a displacement amplitude modulator base fastening nut; 26 is an aluminum alloy hub center hole positioning support base; 27 is an aluminum alloy hub; 28 is an aluminum alloy hub center hole magnetic fastener. DETAILED DESCRIPTION

[0020] <Ultrasonic impact strengthening device for improving fatigue strength of aluminum alloy wheels for new energy vehicles> As mentioned above, the present invention provides an ultrasonic impact strengthening device, in particular, an ultrasonic impact strengthening device for improving the fatigue strength of an aluminum alloy wheel hub of a new energy vehicle, wherein the ultrasonic impact strengthening device comprises an equipment base 1, a spoke strengthening unit, a rim strengthening unit and an aluminum alloy wheel hub fixing unit; the aluminum alloy wheel hub fixing unit is arranged between the spoke strengthening unit and the rim strengthening unit; The spoke strengthening unit includes a spoke strengthening support rod 3, a spoke strengthening support rod displacement drive motor 4, a spoke strengthening left and right displacement positioner 5, a spoke strengthening left and right displacement support rod 6, and a spoke strengthening structural member; The spoke reinforcement support rod 3 is vertically connected to the equipment base 1; the spoke reinforcement left and right displacement support rod 6 is vertically connected to the spoke reinforcement support rod 3; the spoke reinforcement support rod displacement drive motor 4 is arranged at the rear end of the spoke reinforcement left and right displacement support rod 6, and is used to realize the up and down displacement of the spoke reinforcement left and right displacement support rod 6 in the vertical direction; the spoke reinforcement left and right displacement positioner 5 is connected to the spoke reinforcement left and right displacement support rod 6; the spoke reinforcement structural member is connected to the spoke reinforcement left and right displacement support rod 6 through the spoke reinforcement left and right displacement positioner 5, and the spoke reinforcement left and right displacement positioner 5 is used to realize the left and right displacement of the spoke reinforcement structural member in the horizontal direction; The spoke reinforcement structural member is used to realize ultrasonic impact strengthening of the spoke area of ​​the aluminum alloy wheel hub; The rim strengthening unit includes a rim strengthening structure, a rim strengthening support rod displacement drive motor 20, a rim strengthening support rod 21, a displacement modulator 23 and a displacement modulator clamp 24; The displacement modulator 23 is vertically connected to the equipment base 1; the displacement modulator clamping fixture 24 is located above the displacement modulator 23, and the displacement modulator clamping fixture 24 connects the rim reinforcement structure and the displacement modulator 23; the displacement modulator 23 is used to support the up and down displacement of the rim reinforcement structure in the vertical direction; The rim reinforcement support rod 21 is vertically connected to the equipment base 1; one end of the rim reinforcement support rod 21 is connected to the rim reinforcement support rod displacement drive motor 20, and the other end is connected to the rim reinforcement structure; the rim reinforcement support rod displacement drive motor 20 is used to realize the up and down displacement of the rim reinforcement structure in the vertical direction, and to realize the left and right displacement of the rim reinforcement structure in the horizontal direction; The rim reinforcement structural member is used to realize ultrasonic impact strengthening of the rim area of ​​the aluminum alloy wheel hub; The aluminum alloy wheel hub fixing unit includes a differential support seat 12, a differential 14, a differential speed regulating drive shaft 15 and an aluminum alloy wheel hub fixing structural member; The differential support seat 12 is vertically connected to the equipment base 1 , and the differential support seat 12 is connected to the differential speed regulating drive shaft 15 through the differential 14 ; an aluminum alloy wheel hub fixing structure is arranged above the differential speed regulating drive shaft 15 for fixing the aluminum alloy wheel hub 27 .

[0021] In the present invention, the term "vertical direction" refers to a direction perpendicular to the ground; and the term "horizontal direction" refers to a direction parallel to the ground.

[0022] <Device Base> According to the embodiment of the present invention, the material of the equipment base 1 is stainless steel; the length of the equipment base 1 is ≥2000 mm; the width of the equipment base 1 is ≥600 mm; and the thickness of the equipment base 1 is ≥35 mm.

[0023] <Spoke reinforcement unit> According to an embodiment of the present invention, the spoke reinforcement structure and the spoke reinforcement unit are used to achieve ultrasonic impact strengthening of the spoke region of the aluminum alloy hub, preferably to achieve ultrasonic impact strengthening of the inner cavity surface of the spoke region of the aluminum alloy hub.

[0024] According to an embodiment of the present invention, the spoke reinforcement support rod 3 is vertically connected to the equipment base 1, that is, the angle between the spoke reinforcement support rod 3 and the equipment base 1 is 90°.

[0025] According to an embodiment of the present invention, the spoke reinforcement left-right displacement support rod 6 is vertically connected to the spoke reinforcement support rod 3, that is, the angle between the spoke reinforcement left-right displacement support rod 6 and the spoke reinforcement support rod 3 is 90°.

[0026] According to an implementation scheme of the present invention, the spoke reinforcement support rod displacement drive motor 4 is arranged at the rear end of the spoke reinforcement left and right displacement support rod 6; the rear end corresponds to the front end, the rear end refers to the end of the spoke reinforcement left and right displacement support rod 6 where the spoke reinforcement structural part is not set, and the front end refers to the end of the spoke reinforcement left and right displacement support rod 6 where the spoke reinforcement structural part is set; the spoke reinforcement support rod displacement drive motor 4 is used to realize the up and down displacement of the spoke reinforcement left and right displacement support rod 6 in the vertical direction.

[0027] According to the embodiment of the present invention, the spoke reinforcement support rod displacement driving motor 4 coincides with the center of the spoke reinforcement left and right displacement support rods 6 .

[0028] According to the embodiment of the present invention, the spoke reinforcement left-right displacement positioner 5 is connected to the spoke reinforcement left-right displacement support rod 6 through a nut.

[0029] According to an embodiment of the present invention, the spoke reinforcement structure is located directly below the spoke reinforcement left and right displacement positioner 5 .

[0030] According to an implementation scheme of the present invention, the spoke reinforcement structural component includes a spoke reinforcement power supply system 7, a spoke reinforcement transducer 8, a spoke reinforcement amplitude rod 9, a spoke reinforcement angle adjuster 10 and a spoke reinforcement impact gun 11; the spoke reinforcement transducer 8 is connected to the spoke reinforcement left and right displacement positioner 5 through the spoke reinforcement power supply system 7, the spoke reinforcement angle adjuster 10 is connected to the spoke reinforcement transducer 8 through the spoke reinforcement amplitude rod 9, and the spoke reinforcement impact gun 11 is connected to the spoke reinforcement angle adjuster 10.

[0031] According to the embodiment of the present invention, the spoke reinforcement power supply system 7 is located directly below the spoke reinforcement left and right displacement positioner 5 and is connected to the spoke reinforcement left and right displacement positioner 5 via a nut.

[0032] According to an embodiment of the present invention, the spoke strengthening transducer 8 is located directly below the spoke strengthening power supply system 7, the spoke strengthening amplitude transformer 9 is located directly below the spoke strengthening transducer 8, the spoke strengthening angle adjuster 10 is located directly below the spoke strengthening amplitude transformer 9, and the spoke strengthening impact gun 11 is located directly below the spoke strengthening angle adjuster 10.

[0033] According to the embodiment of the present invention, the spoke reinforcement structure is vertically connected to the spoke reinforcement left and right displacement support rods 6 .

[0034] According to an embodiment of the present invention, the spoke reinforcement support rod 3 is vertically connected to the equipment base 1 through the spoke reinforcement support rod fastening nut 2.

[0035] According to an embodiment of the present invention, the material of the spoke reinforcement support rod fastening nuts 2 is carbon steel, and the number of the spoke reinforcement support rod fastening nuts 2 is 4-6.

[0036] According to an embodiment of the present invention, the spoke reinforcement support rod 3 is made of stainless steel; the cross-section of the spoke reinforcement support rod 3 is a square, such as a square with a side length of 50mm-80mm; the height of the spoke reinforcement support rod 3 is 800mm-1200mm.

[0037] According to an implementation scheme of the present invention, the material of the spoke-reinforced left and right displacement support rod 6 is stainless steel; the cross-section of the spoke-reinforced left and right displacement support rod 6 is square, such as a rectangle with a side length of 40mm-60mm; the length of the spoke-reinforced left and right displacement support rod 6 is 600mm-1000mm.

[0038] According to an embodiment of the present invention, the distance of the up-and-down displacement of the spoke-reinforced left-and-right displacement support rod 6 in the vertical direction is 100mm-400mm, for example, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm or 400mm.

[0039] According to an embodiment of the present invention, the left and right displacement distance of the spoke reinforcement structure along the horizontal direction is 50mm-950mm, for example, 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm, 800mm, 850mm, 900mm or 950mm.

[0040] According to an embodiment of the present invention, the output power of the spoke-enhanced power supply system 7 is 400W-3200W, for example, 400W, 500W, 600W, 800W, 1000W, 1200W, 1500W, 1800W, 2000W, 2400W, 2500W, 2800W, 3000W or 3200W.

[0041] According to the embodiment of the present invention, the material of the spoke reinforcement transducer 8 is piezoelectric ceramic, the maximum preload force is 100N-800N, the front cover plate is made of stainless steel, and the rear cover plate is made of tungsten alloy.

[0042] According to an embodiment of the present invention, the spoke reinforcement transducer 8 is cooled by water, and the composition of the water-based coolant includes 5.2%-6.0% (mass fraction, the same below) of polysiloxane, 1.2%-1.8% of polyoxypropylene polymer (PolyalkyleneGlycol), 0.15%-0.30% of borate, 0.25%-0.45% of organic amine, 0.4%-0.5% of sulfided fatty acid, 0.35%-0.55% of triethanolamine, 0.12%-0.25% of isothiazolinone, and the balance is pure water.

[0043] According to an embodiment of the present invention, the spoke reinforcing horn 9 has a stepped structure.

[0044] According to the embodiment of the present invention, the impact head of the spoke strengthening impact gun 11 is spherical, and the radius of the spherical head is 2.0 mm-3.5 mm.

[0045] According to the embodiment of the present invention, the impact head of the spoke strengthening impact gun 11 is made of tungsten carbide hard alloy, and the cobalt content in the tungsten carbide is 5%-10%.

[0046] According to an embodiment of the present invention, a TiAlN ceramic coating is physically vapor deposited on the surface of the impact head of the spoke strengthening impact gun 11, and the hardness is 85HRA-95HRA.

[0047] According to the embodiment of the present invention, the number of impact heads of the spoke strengthening impact gun 11 is 18-25, and the working mode is multi-point mold impact.

[0048] According to the embodiment of the present invention, the vibration frequency of the spoke strengthening impact gun 11 is 20kHz-35kHz, the impact pressure is 60N-180N, the single point impact time is 0.5s-1.2s, and the moving speed is 0.25mm·s -1 -0.40mm·s -1 , the path planning overlap rate is 20%-50%, and the duty cycle is 50%-100%.

[0049] According to an embodiment of the present invention, the amplitude of the spoke reinforcing horn 9 is 15 μm-45 μm, for example, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm or 45 μm.

[0050] According to an embodiment of the present invention, the angle adjustment range of the spoke reinforcement angle adjuster 10 is -30°~210°, for example, -30°, 0°, 30°, 45°, 60°, 75°, 90°, 120°, 150°, 180° or 210°.

[0051] <Rim reinforcement unit> According to an embodiment of the present invention, the rim reinforcement unit and the rim reinforcement structure are used to achieve ultrasonic impact strengthening of the rim area of ​​the aluminum alloy wheel hub, preferably to achieve ultrasonic impact strengthening of the outer side of the rim area of ​​the aluminum alloy wheel hub.

[0052] According to the embodiment of the present invention, the displacement modulator 23 is vertically connected to the equipment base 1 through the displacement modulator base fastening nut 25.

[0053] According to an embodiment of the present invention, the material of the modulator base fastening nut 25 is carbon steel; the number of the modulator base fastening nuts 25 is 4-6.

[0054] According to an embodiment of the present invention, the displacement modulator 23 can make the rim reinforcement structure move up and down in the vertical direction by a distance of 40mm-320mm, for example, 40mm, 50mm, 60mm, 80mm, 100mm, 120mm, 150mm, 160mm, 180mm, 200mm, 220mm, 240mm, 250mm, 280mm, 300mm or 320mm.

[0055] According to an embodiment of the present invention, the displacement modulator clamp 24 is made of alloy steel; the shape of the displacement modulator clamp 24 is a square, such as a square with a side length of 60mm-100mm; the thickness of the displacement modulator clamp 24 is 20mm-40mm.

[0056] According to an embodiment of the present invention, the displacement modulator 23 and the displacement modulator clamp 24 have their centers of gravity on the same line.

[0057] According to an embodiment of the present invention, the rim reinforcement support rod 21 is vertically connected to the equipment base 1 through the rim reinforcement support rod fastening nut 22.

[0058] According to an embodiment of the present invention, the material of the rim reinforcement support rod fastening nuts 22 is carbon steel; the number of the rim reinforcement support rod fastening nuts 22 is 4-6.

[0059] According to an embodiment of the present invention, the rim strengthening support rod 21 is made of stainless steel; the cross-section of the rim strengthening support rod 21 is a square, such as a square with a side length of 30mm-60mm; the height of the rim strengthening support rod 21 is 400mm-800mm.

[0060] According to an embodiment of the present invention, the rim reinforcement support rod displacement drive motor 20 can make the rim reinforcement structure displace up and down in the vertical direction by a distance of 50mm-750mm, for example, 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm or 750mm; the rim reinforcement support rod displacement drive motor 20 can make the rim reinforcement structure displace left and right in the horizontal direction by a distance of 20mm-80mm, for example, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm or 80mm.

[0061] According to an embodiment of the present invention, the rim reinforcement structure is vertically connected to the rim reinforcement support rod 21 .

[0062] According to an embodiment of the present invention, the displacement modulator 23 is arranged in parallel with the rim reinforcement support rod 21 .

[0063] According to an embodiment of the present invention, the rim reinforcement structure is connected to the rim reinforcement support rod 21 via a nut.

[0064] According to an embodiment of the present invention, the rim strengthening structure includes a rim strengthening impact gun 16, a rim strengthening amplitude rod 17, a rim strengthening transducer 18 and a rim strengthening power supply system 19; the rim strengthening power supply system 19 is connected to the rim strengthening support rod 21, the rim strengthening amplitude rod 17 is connected to the rim strengthening power supply system 19 through the rim strengthening transducer 18, and the rim strengthening impact gun 16 is connected to the rim strengthening amplitude rod 17.

[0065] According to an embodiment of the present invention, the rim strengthening power supply system 19 is connected to the rim strengthening support rod 21 through a nut; the rim strengthening transducer 18 is connected to the rim strengthening power supply system 19 through a nut; the rim strengthening amplitude rod 17 is connected to the rim strengthening transducer 18 through a nut; the rim strengthening impact gun 16 is connected to the rim strengthening amplitude rod 17 through a nut.

[0066] According to an embodiment of the present invention, the center levels of the rim strengthening transducer 18 and the rim strengthening power supply system 19 are collinear; the center levels of the rim strengthening amplitude rod 17 and the rim strengthening transducer 18 are collinear; the center levels of the rim strengthening impact gun 16 and the rim strengthening amplitude rod 17 are collinear.

[0067] According to an embodiment of the present invention, the angle between the rim strengthening support rod displacement driving motor 20 and the rim strengthening support rod 21 is 90°, and the angle between the rim strengthening power supply system 19 and the rim strengthening support rod 21 is 90°.

[0068] According to an embodiment of the present invention, the output power of the rim strengthening power supply system 19 is 500W-2400W, for example, 500W, 600W, 800W, 1000W, 1200W, 1500W, 1800W, 2000W or 2400W.

[0069] According to the embodiment of the present invention, the material of the rim strengthening transducer 18 is piezoelectric ceramic, the maximum preload force is 200N-600N, the front cover plate is made of titanium alloy, the rear cover plate is made of alloy steel, the cooling method is air cooling, and the air cooling flow rate is 50L·min -1 -95L·min -1 .

[0070] According to an embodiment of the present invention, the impact head of the rim strengthening impact gun 16 is in the shape of a roller, and the radius of the roller is 1.5 mm-2.5 mm.

[0071] According to the embodiment of the present invention, the impact head of the rim strengthening impact gun 16 is made of titanium carbide hard alloy, and the molybdenum content in the titanium carbide hard alloy is 2%-6%.

[0072] According to the embodiment of the present invention, the surface of the impact head of the rim strengthening impact gun 16 is physically vapor deposited with a TiAlN ceramic coating, the hardness is 95HRA-105HRA, the number is 20-30, and the working mode is multi-point mold impact.

[0073] According to the embodiment of the present invention, the vibration frequency of the rim strengthening impact gun 16 is 35Hz-50kHz, the impact pressure is 120N-300N, the single point impact time is 0.1s-0.4s, and the moving speed is 0.15mm·s -1 -0.25mm·s -1 , the path planning overlap rate is 30%-70%, and the duty cycle is 60%-90%.

[0074] According to an embodiment of the present invention, the structure of the rim reinforcement horn 17 is exponential.

[0075] According to an embodiment of the present invention, the amplitude of the rim reinforcement horn 17 is 25 μm-50 μm, for example, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or 50 μm.

[0076] According to the embodiment of the present invention, the displacement amplitude modulator clamping fixture 24 is used to connect the rim strengthening impact gun 16 and the displacement amplitude modulator 23 in the rim strengthening structure.

[0077] <The aluminum alloy wheel fixing unit> According to an embodiment of the present invention, the aluminum alloy wheel hub fixing structure includes an aluminum alloy wheel hub center hole positioning support base 26, an aluminum alloy wheel hub 27 and an aluminum alloy wheel hub center hole magnetic fastener 28; the aluminum alloy wheel hub center hole positioning support base 26 is arranged above the differential speed regulating drive shaft 15; the aluminum alloy wheel hub 27 is placed above the aluminum alloy wheel hub center hole positioning support base 26, and the aluminum alloy wheel hub center hole magnetic fastener 28 is arranged above the aluminum alloy wheel hub 27; the aluminum alloy wheel hub center hole magnetic fastener 28 is used to realize the tight positioning of the aluminum alloy wheel hub 27 by the aluminum alloy wheel hub center hole positioning support base 26 after applying magnetic force through electromagnetic induction.

[0078] According to the embodiment of the present invention, the displacement modulator 23 is arranged in parallel with the differential speed regulating drive shaft 15 .

[0079] According to the embodiment of the present invention, the differential 14 is arranged directly above the differential support seat 12 ; and the differential speed regulating drive shaft 15 is arranged directly above the differential 14 .

[0080] According to the embodiment of the present invention, the differential 4 can drive the aluminum alloy wheel hub 27 to rotate at high speed through the differential speed regulating drive shaft 15, the aluminum alloy wheel hub center hole positioning support base 26 and the aluminum alloy wheel hub center hole magnetic fastener 28.

[0081] According to an embodiment of the present invention, an aluminum alloy wheel hub 27 is placed directly above the center of the aluminum alloy wheel hub center hole positioning support base 26 , and an aluminum alloy wheel hub center hole magnetic fastener 28 is provided directly above the center hole of the aluminum alloy wheel hub 27 .

[0082] According to an embodiment of the present invention, the centers of the differential 14, the differential speed regulating drive shaft 15, the aluminum alloy wheel hub center hole positioning support base 26, the aluminum alloy wheel hub 27 and the aluminum alloy wheel hub center hole magnetic fastener 28 coincide with each other.

[0083] According to the embodiment of the present invention, the differential support seat 12 is connected to the equipment base 1 through the differential support seat fastening nut 13. The material of the differential support seat fastening nut 13 is carbon steel, and the number of the differential support seat fastening nut 13 is 4-6.

[0084] According to the embodiment of the present invention, the material of the differential support seat 12 is alloy steel, and the height of the differential support seat 12 is ≥300 mm.

[0085] According to the implementation scheme of the present invention, the material of the differential speed regulating drive shaft 15 is alloy steel, the diameter of the differential speed regulating drive shaft 15 is 40mm-60mm; the length of the differential speed regulating drive shaft 15 is ≥350mm.

[0086] According to the embodiment of the present invention, the differential 14 is connected to the differential speed regulating drive shaft 15 through a transmission gear; the output speed of the differential 14 after being connected to the differential speed regulating drive shaft 15 through the transmission gear is 500r·min -1 -2000r·min -1 , for example 600r·min -1 、800r·min -1 、1000r·min -1 、1200r·min -1 、1500r·min -1 、1800r·min -1 .

[0087] According to the implementation scheme of the present invention, the material of the aluminum alloy wheel hub center hole positioning support base 26 is permanent magnetic steel; the diameter of the aluminum alloy wheel hub center hole positioning support base 26 is 180mm-320mm; the thickness of the aluminum alloy wheel hub center hole positioning support base 26 is ≥35mm.

[0088] According to an embodiment of the present invention, the magnetic induction intensity applied to the aluminum alloy hub center hole magnetic fastener 28 is 0.3T-0.6T, for example, 0.3T, 0.4T, 0.5T or 0.6T.

[0089] <Ultrasonic impact strengthening method to improve fatigue strength of aluminum alloy wheels for new energy vehicles> The present invention also provides an ultrasonic impact strengthening method for improving the fatigue strength of aluminum alloy wheel hubs for new energy vehicles. The method is based on the above-mentioned ultrasonic impact strengthening device for improving the fatigue strength of aluminum alloy wheel hubs for new energy vehicles; the method comprises the following steps: (i) Positioning and installing the aluminum alloy wheel hub: installing the aluminum alloy wheel hub 27 on the aluminum alloy wheel hub center hole positioning support base 26, installing the aluminum alloy wheel hub center hole magnetic fastener 28 above the aluminum alloy wheel hub 27; applying electromagnetic induction to the aluminum alloy wheel hub center hole magnetic fastener 28 to achieve positioning of the aluminum alloy wheel hub 27; (ii) Ultrasonic impact strengthening of the spokes of the aluminum alloy wheel hub: start the spoke strengthening support rod displacement drive motor 4 and the spoke strengthening left and right displacement positioner 5, and adjust the position of the spoke strengthening impact gun 11; start the differential 14, and drive the aluminum alloy wheel hub 27 to rotate through the differential speed regulating drive shaft 15, the aluminum alloy wheel hub center hole positioning support base 26 and the aluminum alloy wheel hub center hole magnetic fastener 28; start the spoke strengthening impact gun 11 to perform ultrasonic impact strengthening on the spoke area of ​​the aluminum alloy wheel hub 27; (iii) Ultrasonic impact strengthening of the aluminum alloy wheel rim: start the rim strengthening support rod displacement drive motor 20 and the displacement modulator 23, and adjust the position of the rim strengthening impact gun 16; start the differential 14, and drive the aluminum alloy wheel 27 to rotate through the differential speed regulating drive shaft 15, the aluminum alloy wheel center hole positioning support base 26 and the aluminum alloy wheel center hole magnetic fastener 28; turn on the rim strengthening impact gun 16 to perform ultrasonic impact strengthening on the rim area of ​​the aluminum alloy wheel 27.

[0090] According to an embodiment of the present invention, the method further comprises: (iv) Inspection of aluminum alloy wheel hub surface: the aluminum alloy wheel hub center hole magnetic fastener 28 is closed, the aluminum alloy wheel hub 27 is taken out from above the aluminum alloy wheel hub center hole positioning support base 26, and the surface of the aluminum alloy wheel hub 27 is inspected to complete the ultrasonic impact strengthening of the aluminum alloy wheel hub 27.

[0091] According to an embodiment of the present invention, in step (i), the intensity of the battery induction is 0.3T-0.6T.

[0092] According to the implementation scheme of the present invention, in step (ii), the spoke strengthening support rod displacement drive motor 4 is started, and the spoke strengthening impact gun 11 is adjusted to a distance between the spoke strengthening impact gun 11 and the spoke area of ​​the aluminum alloy hub 27 in the horizontal direction of 0-5 μm. When the distance is 0, it means that the spoke strengthening impact gun 11 and the spoke area of ​​the aluminum alloy hub 27 are in contact with each other in the horizontal direction.

[0093] According to the implementation scheme of the present invention, in step (ii), the spoke strengthening left and right displacement positioner 5 is started, and the spoke strengthening impact gun 11 is adjusted to a distance of 0-5 μm between the spoke strengthening impact gun 11 and the spoke area of ​​the aluminum alloy hub 27 in the vertical direction. When the distance is 0, it means that the spoke strengthening impact gun 11 and the spoke area of ​​the aluminum alloy hub 27 are in contact with each other in the vertical direction.

[0094] According to an embodiment of the present invention, in step (ii), when the spoke strengthening impact gun 11 is turned on to perform ultrasonic impact strengthening on the spoke area of ​​the aluminum alloy hub 27, the position of the spoke strengthening impact gun 11 is dynamically adjusted according to the structural dimensions of the spoke area of ​​the aluminum alloy hub 27.

[0095] According to an embodiment of the present invention, in step (ii), the dynamic adjustment process is performed until the ultrasonic impact strengthening of all spoke regions of the aluminum alloy wheel hub 27 is completed.

[0096] According to the implementation scheme of the present invention, in step (ii), the position of the spoke strengthening impact gun 11 is dynamically adjusted by the spoke strengthening support rod displacement driving motor 4 and the spoke strengthening left and right displacement positioner 5 to ensure that the vertical distance between the spoke strengthening impact gun 11 and the spoke area of ​​the aluminum alloy hub 27 is 0-5μm; the horizontal distance between the spoke strengthening impact gun 11 and the spoke area of ​​the aluminum alloy hub 27 is 0-5μm.

[0097] According to an embodiment of the present invention, after the aluminum alloy hub spoke ultrasonic impact strengthening step in step (ii) is completed, the following steps are further included: The spoke strengthening impact gun 11 and the differential 14 are turned off; the spoke strengthening support rod displacement drive motor 4 is started to move the spoke strengthening impact gun 11 to the outside of the top surface area of ​​the aluminum alloy wheel hub 27 .

[0098] According to the embodiment of the present invention, preferably, the spoke strengthening support rod displacement driving motor 4 is started to move the spoke strengthening impact gun 11 to a position with a height distance of 150 mm to 250 mm from the top surface of the aluminum alloy hub 27 .

[0099] According to an embodiment of the present invention, in step (ii), the rotation speed of the aluminum alloy wheel hub 27 is 1200 r·min -1 -2000r·min -1 The time for the ultrasonic impact strengthening treatment of the spoke is 3min-5min.

[0100] According to the embodiment of the present invention, in step (iii), the rim strengthening support rod displacement drive motor 20 and the displacement modulator 23 are started, and the rim strengthening impact gun 16 is adjusted to a distance between the rim strengthening impact gun 16 and the rim area of ​​the aluminum alloy wheel hub 27 in the vertical direction of 0-5 μm. When the distance is 0, it means that the rim strengthening impact gun 16 and the rim area of ​​the aluminum alloy wheel hub 27 are in contact with each other in the vertical direction.

[0101] According to an embodiment of the present invention, in step (iii), when the rim strengthening impact gun 16 is turned on to perform ultrasonic impact strengthening on the rim area of ​​the aluminum alloy wheel hub 27, the position of the rim strengthening impact gun 16 is dynamically adjusted according to the structural dimensions of the rim area of ​​the aluminum alloy wheel hub 27.

[0102] According to an embodiment of the present invention, in step (iii), the dynamic adjustment process is performed until the ultrasonic impact strengthening of all rim areas of the aluminum alloy wheel hub 27 is completed.

[0103] According to an embodiment of the present invention, in step (iii), the position of the rim strengthening impact gun 16 is dynamically adjusted by the rim strengthening support rod displacement drive motor 20 and the displacement amplitude modulator 23 to ensure that the vertical distance between the rim strengthening impact gun 16 and the rim area of ​​the aluminum alloy wheel hub 27 is 0-5 μm.

[0104] According to an embodiment of the present invention, after the aluminum alloy hub spoke ultrasonic impact strengthening step in step (iii) is completed, the following steps are further included: The rim strengthening impact gun 16 and the differential 14 are turned off; the rim strengthening support rod displacement drive motor 20 is started to move the rim strengthening impact gun 16 to the outside of the side area of ​​the aluminum alloy wheel hub 27.

[0105] According to the embodiment of the present invention, preferably, the rim strengthening support rod displacement driving motor 20 is started to move the rim strengthening impact gun 16 to a position with a horizontal distance of 100 mm to 150 mm from the side of the aluminum alloy wheel hub 27 .

[0106] According to an embodiment of the present invention, in step (iii), the rotation speed of the aluminum alloy wheel hub 27 is 500 r·min -1 -1200r·min -1 The time for the rim ultrasonic impact strengthening treatment is 2min-4min.

[0107] The technical scheme of the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only exemplary descriptions and explanations of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are included in the scope that the present invention is intended to protect.

[0108] Unless otherwise specified, the experimental methods used in the following examples are all conventional methods; the reagents, materials, etc. used in the following examples, unless otherwise specified, can be obtained from commercial channels.

[0109] Example 1 An ultrasonic impact strengthening device for improving the fatigue strength of an aluminum alloy wheel hub of a new energy vehicle, the ultrasonic impact strengthening device comprising an equipment base 1, a spoke strengthening unit, a rim strengthening unit and an aluminum alloy wheel hub fixing unit; the aluminum alloy wheel hub fixing unit is arranged between the spoke strengthening unit and the rim strengthening unit; The spoke strengthening unit includes a spoke strengthening support rod 3, a spoke strengthening support rod displacement drive motor 4, a spoke strengthening left and right displacement positioner 5, a spoke strengthening left and right displacement support rod 6 and a spoke strengthening structural member; the spoke strengthening structural member includes a spoke strengthening power supply system 7, a spoke strengthening transducer 8, a spoke strengthening amplitude rod 9, a spoke strengthening angle adjuster 10 and a spoke strengthening impact gun 11; The spoke reinforcement support rod 3 is vertically connected to the equipment base 1 through the spoke reinforcement support rod fastening nut 2; the spoke reinforcement left and right displacement support rod 6 is vertically connected to the spoke reinforcement support rod 3; the spoke reinforcement support rod displacement drive motor 4 is arranged at the rear end of the spoke reinforcement left and right displacement support rod 6, and the spoke reinforcement support rod displacement drive motor 4 coincides with the center of the spoke reinforcement left and right displacement support rod 6; the spoke reinforcement support rod displacement drive motor 4 is used to realize the up and down displacement of the spoke reinforcement left and right displacement support rod 6 in the vertical direction, and the up and down displacement distance is 100mm-400mm; the spoke reinforcement left and right displacement positioner 5 is arranged on the spoke reinforcement left and right displacement support rod 6, and the spoke reinforcement left and right displacement positioner 5 is used to realize the left and right displacement of the spoke reinforcement structural member in the horizontal direction, and the left and right displacement distance is 50mm-950mm; The spoke strengthening transducer 8 is connected to the spoke strengthening left and right displacement positioner 5 through the spoke strengthening power supply system 7, the spoke strengthening angle adjuster 10 is connected to the spoke strengthening transducer 8 through the spoke strengthening amplitude rod 9, the spoke strengthening impact gun 11 is connected to the spoke strengthening angle adjuster 10, the spoke strengthening power supply system 7 is located directly below the spoke strengthening left and right displacement positioner 5, and is connected to the spoke strengthening left and right displacement positioner 5 through a nut; the spoke strengthening transducer 8 is located directly below the spoke strengthening power supply system 7, the spoke strengthening amplitude rod 9 is located directly below the spoke strengthening transducer 8, the spoke strengthening angle adjuster 10 is located directly below the spoke strengthening amplitude rod 9, and the spoke strengthening impact gun 11 is located directly below the spoke strengthening angle adjuster 10; The spoke reinforcement structural member is used to realize ultrasonic impact strengthening of the spoke area of ​​the aluminum alloy wheel hub; The rim strengthening unit includes a rim strengthening structure, a rim strengthening support rod displacement drive motor 20, a rim strengthening support rod 21, a displacement amplitude modulator 23 and a displacement amplitude modulator clamp 24; the rim strengthening structure includes a rim strengthening impact gun 16, a rim strengthening amplitude rod 17, a rim strengthening transducer 18 and a rim strengthening power supply system 19; The rim strengthening support rod 21 is vertically connected to the equipment base 1 through the rim strengthening support rod fastening nut 22; one end of the rim strengthening support rod 21 is connected to the rim strengthening support rod displacement driving motor 20, and the angle between the rim strengthening support rod displacement driving motor 20 and the rim strengthening support rod 21 is 90°; the other end of the rim strengthening support rod 21 is connected to the rim strengthening power supply system 19, and the angle between the rim strengthening power supply system 19 and the rim strengthening support rod 21 is 90°; the rim strengthening support rod displacement driving motor 20 is used to realize the up and down displacement of the rim strengthening structure in the vertical direction, and the distance of the up and down displacement is 50mm-750mm; the rim strengthening support rod displacement driving motor 20 is also used to realize the left and right displacement of the rim strengthening structure in the horizontal direction, and the distance of the left and right displacement is 20mm-80mm; The rim strengthening horn 17 is connected to the rim strengthening power supply system 19 through the rim strengthening transducer 18, the rim strengthening impact gun 16 is connected to the rim strengthening horn 17, and the centers of the rim strengthening impact gun 16, the rim strengthening horn 17, the rim strengthening transducer 18 and the rim strengthening power supply system 19 are horizontally collinear; The displacement modulator 23 is vertically connected to the equipment base 1 through the displacement modulator base fastening nut 25; the displacement modulator clamping fixture 24 is located above the displacement modulator 23, and the displacement modulator clamping fixture 24 connects the rim reinforcement impact gun 16 and the displacement modulator 23, and the displacement modulator 23 and the displacement modulator clamping fixture 24 have colinear centers of gravity; the displacement modulator 23 is used to support the vertical displacement of the rim reinforcement structure, and the distance of the vertical displacement is 40mm-320mm; The rim reinforcement structural member is used to realize ultrasonic impact strengthening of the rim area of ​​the aluminum alloy wheel hub; The aluminum alloy wheel hub fixing unit includes a differential support seat 12, a differential 14, a differential speed regulating drive shaft 15 and an aluminum alloy wheel hub fixing structure; the aluminum alloy wheel hub fixing structure includes an aluminum alloy wheel hub center hole positioning support base 26, an aluminum alloy wheel hub 27 and an aluminum alloy wheel hub center hole magnetic fastener 28; The differential support seat 12 is vertically connected to the equipment base 1 through the differential support seat fastening nut 13, and the differential support seat 12 is connected to the differential speed regulating drive shaft 15 through the differential 14, and the differential 14 is arranged directly above the differential support seat 12, and the differential speed regulating drive shaft 15 is arranged directly above the differential 14, and the differential 14 and the differential speed regulating drive shaft 15 are also connected through a transmission gear; the aluminum alloy wheel hub center hole positioning support base 26 is arranged above the differential speed regulating drive shaft 15; An aluminum alloy wheel hub 27 is placed directly above the center of the aluminum alloy wheel hub center hole positioning support base 26, and an aluminum alloy wheel hub center hole magnetic fastener 28 is arranged directly above the center hole of the aluminum alloy wheel hub 27; the centers of the differential 14, the differential speed regulating drive shaft 15, the aluminum alloy wheel hub center hole positioning support base 26, the aluminum alloy wheel hub 27 and the aluminum alloy wheel hub center hole magnetic fastener 28 coincide with each other; the aluminum alloy wheel hub center hole magnetic fastener 28 is used to achieve the fastening and fixing of the aluminum alloy wheel hub 27 by the aluminum alloy wheel hub center hole positioning support base 26 after applying magnetic force through electromagnetic induction.

[0110] In one embodiment of the present invention, the spoke reinforcing horn 9 has a stepped structure; the amplitude of the spoke reinforcing horn 9 is 15 μm-45 μm.

[0111] In one embodiment of the present invention, the spoke reinforcement angle adjuster 10 has an angle adjustment range of -30° to 210°.

[0112] In one embodiment of the present invention, the impact head of the spoke strengthening impact gun 11 is spherical, and the radius of the spherical head is 2.0mm-3.5mm; the material of the impact head of the spoke strengthening impact gun 11 is tungsten carbide cemented carbide, and the cobalt content in the tungsten carbide is 5%-10%; the surface of the impact head of the spoke strengthening impact gun 11 is physically vapor deposited TiAlN ceramic coating, and the hardness is 85HRA-95HRA; the number of impact heads of the spoke strengthening impact gun 11 is 18-25, and the working mode is multi-point mold impact.

[0113] In one embodiment of the present invention, the vibration frequency of the spoke strengthening impact gun 11 is 20kHz-35kHz, the impact pressure is 60N-180N, the single point impact time is 0.5s-1.2s, and the moving speed is 0.25mm·s -1 -0.40mm·s -1 , the path planning overlap rate is 20%-50%, and the duty cycle is 50%-100%.

[0114] In one embodiment of the present invention, the impact head of the rim strengthening impact gun 16 is roller-shaped, and the radius of the roller is 1.5mm-2.5mm; the material of the impact head of the rim strengthening impact gun 16 is titanium carbide cemented carbide, and the molybdenum content in the titanium carbide cemented carbide is 2%-6%; the surface of the impact head of the rim strengthening impact gun 16 is physically vapor deposited TiAlN ceramic coating, the hardness is 95HRA-105HRA, the number is 20-30, and the working mode is multi-point mold impact.

[0115] In one embodiment of the present invention, the structure of the rim reinforcement horn 17 is exponential; the amplitude of the rim reinforcement horn 17 is 25 μm-50 μm.

[0116] Example 2 This embodiment also provides an ultrasonic impact strengthening method for improving fatigue strength of aluminum alloy wheel hubs for new energy vehicles. The method is based on the ultrasonic impact strengthening device for improving fatigue strength of aluminum alloy wheel hubs for new energy vehicles described in Example 1. The method comprises the following steps: (i) Positioning and installing the aluminum alloy wheel hub: installing the aluminum alloy wheel hub 27 on the aluminum alloy wheel hub center hole positioning support base 26, and installing the aluminum alloy wheel hub center hole magnetic fastener 28 above the aluminum alloy wheel hub 27; applying electromagnetic induction with a magnetic induction intensity of 0.3T-0.6T to the aluminum alloy wheel hub center hole magnetic fastener 28 to achieve positioning of the aluminum alloy wheel hub 27; (ii) Ultrasonic impact strengthening of the spokes of the aluminum alloy wheel hub: start the spoke strengthening support rod displacement drive motor 4 and the spoke strengthening left and right displacement positioner 5, adjust the position of the spoke strengthening impact gun 11 to make it fit the spoke area of ​​the aluminum alloy wheel hub 27; start the differential 14, and drive the aluminum alloy wheel hub 27 to rotate at a high speed through the differential speed regulating drive shaft 15, the aluminum alloy wheel hub center hole positioning support base 26 and the aluminum alloy wheel hub center hole magnetic fastener 28; wherein the rotation speed of the aluminum alloy wheel hub 27 is 1200r·min -1 -2000r·min -1 ; Turn on the spoke strengthening impact gun 11 to perform ultrasonic impact strengthening on the spoke area of ​​the aluminum alloy wheel hub 27, and dynamically adjust the position of the spoke strengthening impact gun 11 according to the structural size of the spoke area of ​​the aluminum alloy wheel hub 27 until the ultrasonic impact strengthening of all spoke areas of the aluminum alloy wheel hub 27 is completed; during the dynamic adjustment process, the position of the spoke strengthening impact gun 11 is dynamically adjusted by using the spoke strengthening support rod displacement drive motor 4 and the spoke strengthening left and right displacement positioners 5 to ensure that the spoke strengthening impact gun 11 is always attached to the spoke area of ​​the aluminum alloy wheel hub 27; the time for the spoke ultrasonic impact strengthening treatment is 3min-5min; after the aluminum alloy wheel hub spoke ultrasonic impact strengthening step is completed, it also includes: turning off the spoke strengthening impact gun 11 and the differential 14; starting the spoke strengthening support rod displacement drive motor 4 to move the spoke strengthening impact gun 11 to a position with a height distance of 150mm-250mm from the top surface of the aluminum alloy wheel hub 27; (iii) Ultrasonic impact strengthening of aluminum alloy wheel rims: The rim strengthening support rod displacement drive motor 20 and the displacement modulator 23 are started, and the position of the rim strengthening impact gun 16 is adjusted to make it fit the rim area of ​​the aluminum alloy wheel hub 27; the differential 14 is started, and the aluminum alloy wheel hub 27 is driven to rotate at a high speed through the differential speed regulating drive shaft 15, the aluminum alloy wheel hub center hole positioning support base 26 and the aluminum alloy wheel hub center hole magnetic fastener 28; wherein the rotation speed of the aluminum alloy wheel hub 27 is 500r·min -1 -1200r·min -1 ; Turn on the rim strengthening impact gun 16 to perform ultrasonic impact strengthening on the rim area of ​​the aluminum alloy wheel hub 27, and dynamically adjust the position of the rim strengthening impact gun 16 according to the structural size of the rim area of ​​the aluminum alloy wheel hub 27 until the ultrasonic impact strengthening of all rim areas of the aluminum alloy wheel hub 27 is completed; during the dynamic adjustment process, the position of the rim strengthening impact gun 16 is dynamically adjusted by using the rim strengthening support rod displacement drive motor 20 and the displacement modulator 23 to ensure that the rim strengthening impact gun 16 is always attached to the rim area of ​​the aluminum alloy wheel hub 27; the time for the rim ultrasonic impact strengthening treatment is 2min-4min; after the aluminum alloy wheel hub spoke ultrasonic impact strengthening step is completed, it also includes: turning off the rim strengthening impact gun 16 and the differential 14; starting the rim strengthening support rod displacement drive motor 20 to move the rim strengthening impact gun 16 to a position with a horizontal distance of 100mm-150mm from the side of the aluminum alloy wheel hub 27.

[0117] (iv) Inspection of aluminum alloy wheel hub surface: the aluminum alloy wheel hub center hole magnetic fastener 28 is closed, the aluminum alloy wheel hub 27 is taken out from above the aluminum alloy wheel hub center hole positioning support base 26, and the surface of the aluminum alloy wheel hub 27 is inspected to complete the ultrasonic impact strengthening of the aluminum alloy wheel hub 27.

[0118] Example 3 This embodiment provides an ultrasonic impact strengthening method for improving fatigue strength of aluminum alloy wheel hubs for new energy vehicles. The method is based on the ultrasonic impact strengthening device for improving fatigue strength of aluminum alloy wheel hubs for new energy vehicles described in Example 1. Among them, the output power of the spoke strengthening power supply system 7 is 1800W; the material of the spoke strengthening transducer 8 is piezoelectric ceramic, the maximum preload force is 450N, the front cover plate is made of stainless steel, the rear cover plate is made of tungsten alloy, and the cooling method is water cooling; the composition of the water-based coolant includes 5.6% (mass fraction, the same below) of polysiloxane, 1.5% of polyoxypropylene polymer (Polyalkylene Glycol), 0.22% of borate, 0.35% of organic amine, 0.45% of sulfide fatty acid, 0.45% of triethanolamine, 0.20% of isothiazolinone, and the balance is pure water.

[0119] The output power of the rim strengthening power supply system 19 is 1500W; the rim strengthening transducer 18 is made of piezoelectric ceramics, the maximum preload force is 400N, the front cover is made of titanium alloy, the rear cover is made of alloy steel, the cooling method is air cooling, and the air cooling flow rate is 75L·min -1 .

[0120] The spoke strengthening horn 9 has a stepped structure, the spoke strengthening impact gun 11 has a ball-shaped impact head with a ball head radius of 3.0 mm, made of tungsten carbide hard alloy, with a cobalt content of 8%, a TiAlN ceramic coating with physical vapor deposition on the impact head surface, a hardness of 90HRA, 20 layers, and a working mode of multi-point impact. The spoke strengthening impact gun 11 has a vibration frequency of 30 kHz, an impact pressure of 120 N, a single-point impact time of 1.0 s, and a moving speed of 0.35 mm·s -1 The path planning overlap rate is 35%, and the duty cycle is 75%. The amplitude of the spoke strengthening horn 9 is 30 μm.

[0121] The structure of the rim strengthening horn 17 is exponential, the impact head of the rim strengthening impact gun 16 is roller-shaped, the roller radius is 2.0mm, the material is titanium carbide hard alloy, the molybdenum content in the titanium carbide hard alloy is 4%, the surface of the impact head is physically vapor deposited TiAlN ceramic coating, the hardness is 100HRA, the number is 25, and the working mode is multi-point mold impact. The vibration frequency of the rim strengthening impact gun 16 is 42Hz, the impact pressure is 210N, the single-point impact time is 0.25s, and the moving speed is 0.20mm·s -1 The path planning overlap rate is 50%, and the duty cycle is 75%. The amplitude of the rim strengthening amplitude transformer 17 is 40 μm.

[0122] The method is based on the ultrasonic impact strengthening method for improving the fatigue strength of the aluminum alloy wheel hub of new energy vehicles described in Example 2; specifically: applying electromagnetic induction with a magnetic induction intensity of 0.4T to the magnetic fastener 28 of the center hole of the aluminum alloy wheel hub to achieve positioning of the aluminum alloy wheel hub 27; the rotation speed of the aluminum alloy wheel hub 27 in the ultrasonic impact strengthening step of the aluminum alloy wheel hub spoke is 1600r·min -1 The ultrasonic impact strengthening treatment time of the aluminum alloy wheel hub 27 spokes is 4 minutes; after the aluminum alloy wheel hub spoke ultrasonic impact strengthening step is completed, the spoke strengthening support rod displacement drive motor 4 is started to move the spoke strengthening impact gun 11 to a position 200mm away from the top surface of the aluminum alloy wheel hub 27. The rotation speed of the aluminum alloy wheel hub 27 in the aluminum alloy wheel hub rim ultrasonic impact strengthening step is 800r·min -1The ultrasonic impact strengthening treatment time of the rim of the aluminum alloy wheel hub 27 is 3 minutes; after the ultrasonic impact strengthening step of the aluminum alloy wheel hub rim is completed, the rim strengthening support rod displacement driving motor 20 is started to move the rim strengthening impact gun 16 to a position with a horizontal distance of 120 mm from the side of the aluminum alloy wheel hub 27.

[0123] The material of the aluminum alloy wheel hub in Example 3 is A356, and the forming process is metal mold low-pressure casting. Table 1 shows the comparative effect of Example 3 and the surface shot peening strengthening process method for improving the fatigue strength of the aluminum alloy wheel hub of new energy vehicles. Figure 6 Shown is a schematic diagram of the aluminum alloy wheel hub for new energy vehicles prepared in Example 3.

[0124] Table 1 Comparison of the fatigue strength improvement process of Example 3 and surface shot peening for new energy vehicle aluminum alloy wheel hub

[0125] Example 4 This embodiment provides an ultrasonic impact strengthening method for improving fatigue strength of aluminum alloy wheel hubs for new energy vehicles. The method is based on the ultrasonic impact strengthening device for improving fatigue strength of aluminum alloy wheel hubs for new energy vehicles described in Example 1. Among them, the output power of the spoke strengthening power supply system 7 is 3200W; the material of the spoke strengthening transducer 8 is piezoelectric ceramic, the maximum preload force is 800N, the front cover plate is made of stainless steel, the rear cover plate is made of tungsten alloy, and the cooling method is water cooling; the composition of the water-based coolant includes 6.0% (mass fraction, the same below) of polysiloxane, 1.8% of polyoxypropylene polymer (Polyalkylene Glycol), 0.30% of borate, 0.45% of organic amine, 0.5% of sulfided fatty acid, 0.55% of triethanolamine, 0.25% of isothiazolinone, and the balance is pure water.

[0126] The output power of the rim strengthening power supply system 19 is 2400W; the material of the rim strengthening transducer 18 is piezoelectric ceramic, the maximum preload force is 600N, the front cover plate is made of titanium alloy, the rear cover plate is made of alloy steel, the cooling method is air cooling, and the air cooling flow rate is 95L·min -1 .

[0127] The spoke strengthening horn 9 has a stepped structure, the spoke strengthening impact gun 11 has a ball-shaped impact head with a ball head radius of 3.5 mm, made of tungsten carbide hard alloy, with a cobalt content of 10%, a TiAlN ceramic coating with physical vapor deposition on the impact head surface, a hardness of 95HRA, 25 layers, and a working mode of multi-point impact. The spoke strengthening impact gun 11 has a vibration frequency of 35 kHz, an impact pressure of 180 N, a single-point impact time of 1.2 s, and a moving speed of 0.40 mm·s -1 The path planning overlap rate is 50%, and the duty cycle is 100%. The amplitude of the spoke strengthening horn 9 is 45 μm.

[0128] The structure of the rim strengthening horn 17 is exponential, the impact head of the rim strengthening impact gun 16 is roller-shaped, the roller radius is 2.5mm, the material is titanium carbide hard alloy, the molybdenum content in the titanium carbide hard alloy is 6%, the impact head surface is physically vapor deposited TiAlN ceramic coating, the hardness is 105HRA, the number is 30, and the working mode is multi-point mold impact. The vibration frequency of the rim strengthening impact gun 16 is 50kHz, the impact pressure is 300N, the single-point impact time is 0.4s, and the moving speed is 0.25mm·s -1 The path planning overlap rate is 70%, and the duty cycle is 90%. The amplitude of the rim strengthening amplitude transformer 17 is 50 μm.

[0129] The method is based on the ultrasonic impact strengthening method for improving fatigue strength of aluminum alloy wheel hubs of new energy vehicles described in Example 2; specifically, electromagnetic induction with a magnetic induction intensity of 0.6T is applied to the magnetic fastener 28 of the center hole of the aluminum alloy wheel hub to achieve positioning of the aluminum alloy wheel hub 27. The rotation speed of the aluminum alloy wheel hub 27 in the ultrasonic impact strengthening step of the aluminum alloy wheel hub spoke is 2000r·min -1 The ultrasonic impact strengthening treatment time of the aluminum alloy wheel hub 27 spokes is 5 minutes; after the aluminum alloy wheel hub spoke ultrasonic impact strengthening step is completed, the spoke strengthening support rod displacement drive motor 4 is started to move the spoke strengthening impact gun 11 to a position 250mm away from the top surface of the aluminum alloy wheel hub 27. The rotation speed of the aluminum alloy wheel hub 27 in the aluminum alloy wheel hub rim ultrasonic impact strengthening step is 1200r·min -1 The ultrasonic impact strengthening treatment time of the rim of the aluminum alloy wheel hub 27 is 4 minutes; after the ultrasonic impact strengthening step of the aluminum alloy wheel hub rim is completed, the rim strengthening support rod displacement driving motor 20 is started to move the rim strengthening impact gun 16 to a position with a horizontal distance of 150 mm from the side of the aluminum alloy wheel hub 27.

[0130] The material of the aluminum alloy wheel hub in Example 4 is A356, and the forming process is spinning precision forming. Table 2 shows the comparative effect of Example 4 and the laser shock strengthening process method for improving the fatigue strength of aluminum alloy wheel hubs for new energy vehicles. Figure 7 Shown is a physical schematic diagram of a new energy vehicle wheel hub in Example 4.

[0131] Table 2 Comparison of Example 4 and laser shock peening fatigue strength improvement process for new energy vehicle aluminum alloy wheel hub

[0132] Example 5 This embodiment provides an ultrasonic impact strengthening method for improving fatigue strength of aluminum alloy wheel hubs for new energy vehicles. The method is based on the ultrasonic impact strengthening device for improving fatigue strength of aluminum alloy wheel hubs for new energy vehicles described in Example 1. Among them, the output power of the spoke strengthening power supply system 7 is 400W; the material of the spoke strengthening transducer 8 is piezoelectric ceramic, the maximum preload force is 100N, the front cover plate is made of stainless steel, the rear cover plate is made of tungsten alloy, and the cooling method is water cooling; the composition of the water-based coolant includes 5.2% polysiloxane (mass fraction, the same below), 1.2% polyoxypropylene polymer (Polyalkylene Glycol), 0.15% borate, 0.25% organic amine, 0.4% sulfide fatty acid, 0.35% triethanolamine, 0.12% isothiazolinone, and the balance is pure water.

[0133] The output power of the rim strengthening power supply system 19 is 500W; the material of the rim strengthening transducer 18 is piezoelectric ceramic, the maximum preload force is 200N, the front cover plate is made of titanium alloy, the rear cover plate is made of alloy steel, the cooling method is air cooling, and the air cooling flow rate is 50L·min -1 .

[0134] The spoke strengthening horn 9 has a stepped structure, and the impact head of the spoke strengthening impact gun 11 is spherical, with a radius of 2.0 mm, made of tungsten carbide hard alloy, with a cobalt content of 5%, and a TiAlN ceramic coating with a hardness of 85HRA and 18 layers on the impact head surface, and the working mode is multi-point impact. The vibration frequency of the spoke strengthening impact gun 11 is 20 kHz, the impact pressure is 60 N, the single-point impact time is 0.5 s, and the moving speed is 0.25 mm·s -1 The path planning overlap rate is 20%, and the duty cycle is 50%. The amplitude of the spoke strengthening horn 9 is 15 μm.

[0135] The structure of the rim strengthening horn 17 is exponential, the impact head of the rim strengthening impact gun 16 is roller-shaped, the roller radius is 1.5mm, the material is titanium carbide hard alloy, the molybdenum content in the titanium carbide hard alloy is 2%, the surface of the impact head is physically vapor deposited TiAlN ceramic coating, the hardness is 95HRA, the number is 20, and the working mode is multi-point mold impact. The vibration frequency of the rim strengthening impact gun 16 is 35Hz, the impact pressure is 120N, the single-point impact time is 0.1s, and the moving speed is 0.15mm·s -1 The path planning overlap rate is 30%, and the duty cycle is 60%. The amplitude of the rim strengthening amplitude transformer 17 is 25 μm.

[0136] The method is based on the ultrasonic impact strengthening method for improving fatigue strength of aluminum alloy wheel hubs of new energy vehicles described in Example 2; specifically, electromagnetic induction with a magnetic induction intensity of 0.6T is applied to the magnetic fastener 28 of the center hole of the aluminum alloy wheel hub to achieve positioning of the aluminum alloy wheel hub 27. The rotation speed of the aluminum alloy wheel hub 27 in the ultrasonic impact strengthening step of the aluminum alloy wheel hub spoke is 1200r·min -1 The ultrasonic impact strengthening treatment time of the aluminum alloy wheel hub 27 spokes is 3 minutes; after the aluminum alloy wheel hub spoke ultrasonic impact strengthening step is completed, the spoke strengthening support rod displacement drive motor 4 is started to move the spoke strengthening impact gun 11 to a position 150mm away from the top surface of the aluminum alloy wheel hub 27. The rotation speed of the aluminum alloy wheel hub 27 in the aluminum alloy wheel hub rim ultrasonic impact strengthening step is 500r·min -1 The ultrasonic impact strengthening treatment time of the rim of the aluminum alloy wheel hub 27 is 2 minutes; after the ultrasonic impact strengthening step of the aluminum alloy wheel hub rim is completed, the rim strengthening support rod displacement driving motor 20 is started to move the rim strengthening impact gun 16 to a position with a horizontal distance of 100 mm from the side of the aluminum alloy wheel hub 27.

[0137] The material of the aluminum alloy wheel hub in Example 5 is A357, and the forming process is metal mold low-pressure casting. Table 3 shows the comparative effect of Example 5 with the surface shot peening and laser shock strengthening process methods for improving fatigue strength of aluminum alloy wheel hubs for new energy vehicles. Figure 8 Shown is a physical schematic diagram of the new energy vehicle wheel hub in Example 5.

[0138] Table 3 Comparison of the fatigue strength improvement process of Example 5 with surface shot peening and laser shock strengthening for new energy vehicles aluminum alloy wheel hub

[0139] The above is an explanation of the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An ultrasonic impact strengthening device, characterized in that: The device comprises an equipment base, a spoke strengthening unit, a rim strengthening unit and an aluminum alloy wheel hub fixing unit; The spoke strengthening unit includes a spoke strengthening support rod, a spoke strengthening support rod displacement drive motor, a spoke strengthening left and right displacement positioner, a spoke strengthening left and right displacement support rod, and a spoke strengthening structural member; The spoke reinforcement support rod is connected to the equipment base; the spoke reinforcement left and right displacement support rod is connected to the spoke reinforcement support rod; the spoke reinforcement support rod displacement drive motor is arranged at the rear end of the spoke reinforcement left and right displacement support rod; the spoke reinforcement left and right displacement positioner is connected to the spoke reinforcement left and right displacement support rod; the spoke reinforcement structural member is connected to the spoke reinforcement left and right displacement support rod through the spoke reinforcement left and right displacement positioner; the spoke reinforcement structural member is used to realize ultrasonic impact strengthening of the spoke area of ​​the aluminum alloy wheel hub; The rim strengthening unit comprises a rim strengthening structural member, a rim strengthening support rod displacement driving motor, a rim strengthening support rod, a displacement amplitude modulator and a displacement amplitude modulator clamping fixture; The displacement modulator is connected to the equipment base; the displacement modulator clamp is located above the displacement modulator and connects the rim reinforcement structure and the displacement modulator; The rim strengthening support rod is connected to the equipment base; one end of the rim strengthening support rod is connected to the rim strengthening support rod displacement driving motor, and the other end is connected to the rim strengthening structural member; the rim strengthening structural member is used to realize ultrasonic impact strengthening of the rim area of ​​the aluminum alloy wheel hub; The aluminum alloy wheel hub fixing unit includes a differential support seat, a differential, a differential speed regulating drive shaft and an aluminum alloy wheel hub fixing structure; The differential support seat is connected to the equipment base, and the differential support seat is connected to the differential speed regulating drive shaft through the differential; an aluminum alloy wheel hub fixing structure is arranged above the differential speed regulating drive shaft.

2. The ultrasonic impact strengthening device according to claim 1, characterized in that: The spoke strengthening structural component includes a spoke strengthening power supply system, a spoke strengthening transducer, a spoke strengthening amplitude rod, a spoke strengthening angle adjuster and a spoke strengthening impact gun; The spoke strengthening transducer is connected to the spoke strengthening left and right displacement positioner through the spoke strengthening power supply system, the spoke strengthening angle adjuster is connected to the spoke strengthening transducer through the spoke strengthening amplitude rod, and the spoke strengthening impact gun is connected to the spoke strengthening angle adjuster.

3. The ultrasonic impact strengthening device according to claim 2, characterized in that: The rim strengthening structural component includes a rim strengthening impact gun, a rim strengthening horn, a rim strengthening transducer and a rim strengthening power supply system; The rim strengthening power supply system is connected to the rim strengthening support rod, the rim strengthening amplitude rod is connected to the rim strengthening power supply system through the rim strengthening transducer, and the rim strengthening impact gun is connected to the rim strengthening amplitude rod.

4. The ultrasonic impact strengthening device according to claim 1, characterized in that: The distance of the up-and-down displacement of the spoke reinforcement left-and-right displacement support rod in the vertical direction is 100mm-400mm; the distance of the left-and-right displacement of the spoke reinforcement structural member in the horizontal direction is 50mm-950mm; the displacement modulator can make the rim reinforcement structural member displace up-and-down in the vertical direction by 40mm-320mm; the rim reinforcement support rod displacement drive motor can make the rim reinforcement structural member displace up-and-down in the vertical direction by 50mm-750mm; the rim reinforcement support rod displacement drive motor can make the rim reinforcement structural member displace left-and-right in the horizontal direction by 20mm-80mm.

5. The ultrasonic impact strengthening device according to claim 3, characterized in that: The spoke reinforcement horn has a stepped structure; the amplitude of the spoke reinforcement horn is 15 μm-45 μm; The structure of the rim strengthening amplitude transformer is exponential; the amplitude of the rim strengthening amplitude transformer is 25 μm-50 μm.

6. The ultrasonic impact strengthening device according to claim 3, characterized in that: The impact head of the spoke strengthening impact gun is spherical, and the radius of the spherical head is 2.0mm-3.5mm; the surface of the impact head of the spoke strengthening impact gun is physically vapor-deposited with TiAlN ceramic coating, and the hardness is 85HRA-95HRA; the number of impact heads of the spoke strengthening impact gun is 18-25, and the working mode is multi-point mold impact; The spoke reinforcement impact gun has a vibration frequency of 20kHz-35kHz, an impact pressure of 60N-180N, a single-point impact time of 0.5s-1.2s, and a moving speed of 0.25mm·s -1 -0.40mm·s -1 , the path planning overlap rate is 20%-50%, and the duty cycle is 50%-100%; The impact head of the rim strengthening impact gun is roller-shaped, and the radius of the roller is 1.5mm-2.5mm; the surface of the impact head of the rim strengthening impact gun is physically vapor-deposited with TiAlN ceramic coating, the hardness is 95HRA-105HRA, the number is 20-30, and the working mode is multi-point mold impact; The vibration frequency of the rim strengthening impact gun is 35Hz-50kHz, the impact pressure is 120N-300N, the single point impact time is 0.1s-0.4s, and the moving speed is 0.15mm·s -1 -0.25mm·s -1 , the path planning overlap rate is 30%-70%, and the duty cycle is 60%-90%.

7. The ultrasonic impact strengthening device according to claim 1, characterized in that: The displacement amplitude modulator clamping fixture is used to connect the rim strengthening impact gun and the displacement amplitude modulator in the rim strengthening structural member.

8. The ultrasonic impact strengthening device according to claim 1, characterized in that: The aluminum alloy wheel hub fixing structure comprises an aluminum alloy wheel hub center hole positioning support base, an aluminum alloy wheel hub and an aluminum alloy wheel hub center hole magnetic fastener; The aluminum alloy wheel hub center hole positioning support base is arranged above the differential speed regulating drive shaft; the aluminum alloy wheel hub is placed above the aluminum alloy wheel hub center hole positioning support base, and an aluminum alloy wheel hub center hole magnetic fastener is arranged above the aluminum alloy wheel hub; the aluminum alloy wheel hub center hole magnetic fastener applies magnetic force through electromagnetic induction to realize the aluminum alloy wheel hub being tightly positioned by the aluminum alloy wheel hub center hole positioning support base.

9. An ultrasonic impact strengthening method for improving fatigue strength of aluminum alloy wheel hubs for new energy vehicles, the method is based on the ultrasonic impact strengthening device for improving fatigue strength of aluminum alloy wheel hubs for new energy vehicles according to any one of claims 1 to 8; the method comprises the following steps: (i) Positioning and installing the aluminum alloy wheel hub: installing the aluminum alloy wheel hub on the aluminum alloy wheel hub center hole positioning support base, installing the aluminum alloy wheel hub center hole magnetic fastener above the aluminum alloy wheel hub; applying electromagnetic induction to the aluminum alloy wheel hub center hole magnetic fastener to achieve positioning of the aluminum alloy wheel hub; (ii) Ultrasonic impact strengthening of the spokes of the aluminum alloy wheel hub: start the spoke strengthening support rod displacement drive motor and the spoke strengthening left and right displacement positioners, and adjust the position of the spoke strengthening impact gun; start the differential, and drive the aluminum alloy wheel hub to rotate through the differential speed control drive shaft, the aluminum alloy wheel hub center hole positioning support base and the aluminum alloy wheel hub center hole magnetic fastener; turn on the spoke strengthening impact gun to perform ultrasonic impact strengthening on the spoke area of ​​the aluminum alloy wheel hub; (iii) Ultrasonic impact strengthening of aluminum alloy wheel rims: Start the rim strengthening support rod displacement drive motor and displacement modulator, and adjust the position of the rim strengthening impact gun; start the differential, and drive the aluminum alloy wheel to rotate through the differential speed control drive shaft, the aluminum alloy wheel center hole positioning support base and the aluminum alloy wheel center hole magnetic fastener; turn on the rim strengthening impact gun to perform ultrasonic impact strengthening on the rim area of ​​the aluminum alloy wheel.

10. The ultrasonic impact strengthening method according to claim 9, characterized in that: After the aluminum alloy wheel hub spoke ultrasonic impact strengthening step in step (ii) is completed, the following steps are further included: Turn off the spoke strengthening impact gun and the differential; start the spoke strengthening support rod displacement drive motor to move the spoke strengthening impact gun to the outside of the top surface area of ​​the aluminum alloy wheel hub; After the aluminum alloy wheel hub spoke ultrasonic impact strengthening step in step (iii) is completed, the following steps are further included: Turn off the rim strengthening impact gun and the differential; start the rim strengthening support rod displacement drive motor to move the rim strengthening impact gun to the outside of the side area of ​​the aluminum alloy wheel hub; In step (ii), the rotation speed of the aluminum alloy wheel hub is 1200 r·min -1 -2000r·min -1 The time of the wheel spoke ultrasonic impact strengthening treatment is 3min-5min; In step (iii), the rotation speed of the aluminum alloy wheel hub is 500 r·min -1 -1200r·min -1 The time for the rim ultrasonic impact strengthening treatment is 2min-4min.

Images