Longitudinal-bending dual-mode magnetostriction ultrasonic cutting device

Abstract

The invention discloses a magnetostrictive ultrasonic longitudinal-bending dual-mode cutting device and an operation method, the longitudinal-bending dual-mode cutting device is provided with a longitudinal-bending dual-mode main body, the front end of the longitudinal-bending dual-mode main body is provided with a stepped-shaft-shaped tool apron, chamfers or fillets are arranged between steps, the front end of the stepped-shaft-shaped tool apron is provided with a tool mounting part, and the front end of the stepped-shaft-shaped tool apron is provided with a tool holder; a threaded connection hole is formed in the cutter mounting head part, and the cutter is matched with the threaded connection hole and is fixed on the cutter mounting head part through a cutter fixing bolt. Free switching between the longitudinal vibration mode and the bending vibration mode of the machining device can be achieved by adjusting the direct current of the bias coil at the bias coil rack according to the working condition and the machining requirement of a workpiece, and the precision of the machined surface and the flexibility of a machining tool are improved.

Description

Technical Field

[0001] This invention relates to the technical field of ultrasonic processing devices, specifically to the design and development of a longitudinal bending dual-mode magnetostrictive ultrasonic cutting device, wherein the magnetostrictive material is cobalt ferrite material. Background Technology

[0002] Ultrasonic cutting is a composite machining technology that combines high-frequency mechanical vibration with traditional cutting processes. This technology possesses unique cutting characteristics, such as periodic separation of the tool and workpiece, dynamic changes in the cutting angle, and periodic reversal of frictional forces. Based on these characteristics, it can significantly reduce cutting forces and temperatures, improve workpiece surface finish and accuracy, and extend tool life, thus providing an efficient and reliable solution for the precision machining of difficult-to-machine materials.

[0003] The ultrasonic transducer is the core of an ultrasonic machining device. It converts electrical or magnetic energy into mechanical vibration, amplifies and focuses this vibration using an amplitude transformer, and then transmits it to the cutting tool. The cutting tool outputs the vibration energy to the workpiece to be machined, thus achieving ultrasonic cutting. Currently, the most widely used ultrasonic transducers are divided into two categories: piezoelectric transducers and magnetostrictive transducers.

[0004] In the field of ultrasonic transducers, magnetostrictive materials, compared with piezoelectric ceramic materials, have advantages such as strong strain capacity, fast response speed, and high energy conversion efficiency. However, commonly used metal-based magnetostrictive materials are prone to eddy current losses under high-frequency magnetic field excitation, causing serious heat generation problems. Cobalt ferrite, due to its high resistivity, corrosion resistance, low eddy current loss, and high Curie temperature, shows great application potential in the field of high-frequency magnetostrictive ultrasonic transducers. Innovative structures for ultrasonic transducers based on cobalt ferrite materials need further exploration, and researching novel ultrasonic machining tool structures is of great significance for machining complex workpieces and adapting to complex working conditions. Summary of the Invention

[0005] The purpose of this invention is to comprehensively utilize the longitudinal and bending vibration modes to improve the machining accuracy and flexibility of ultrasonic machining tools, improve the machining quality of workpiece surfaces, and broaden the design scheme of ultrasonic cutting processing devices. At the same time, it provides an innovative structure of a magnetostrictive ultrasonic cutting device based on cobalt ferrite material with longitudinal and bending dual modes.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A magnetostrictive ultrasonic longitudinal bending dual-mode cutting device is provided. The longitudinal bending dual-mode cutting device has a longitudinal bending dual-mode body. A stepped shaft-shaped tool holder is provided at the front end of the longitudinal bending dual-mode body. Chamfers or rounded corners are provided between each step. A tool mounting part is provided at the front end of the stepped shaft-shaped tool holder. A threaded connection hole is opened on the tool mounting head. The tool 2 is engaged with the threaded connection hole and fixed to the tool mounting head by a tool fixing bolt 1.

[0007] Further optimized technical solutions, The longitudinal bending dual-mode body has two threaded steel pipes 11 inside, each threaded steel pipe 11 is pre-embedded in the longitudinal bending dual-mode oscillator 10 to form a rigid connection, and the two ends of the threaded steel pipe 11 extend from the two ends of the longitudinal bending dual-mode oscillator 10; each of the two pre-embedded threaded steel pipes 11 has an external bias coil frame 12, on which a bias coil is provided; an excitation coil frame 9 is fitted on the outer layer of the two bias coil frames 12, on which an excitation coil is provided.

[0008] Further optimized technical solutions, The longitudinal bending dual-mode body also has a front cover plate 5 and a rear cover plate 6; The front cover plate 5 has two countersunk holes at its front end and two rectangular connecting holes at its rear end; the rear cover plate 6 has two rectangular connecting holes at its front end and two countersunk holes at its rear end. The longitudinal bending dual-mode oscillator 10 is connected to the front cover plate 5 and the rear cover plate 6 through rectangular connecting holes.

[0009] Further optimized technical solutions, The threaded steel pipe 11 is fitted with the front cover plate 5 through a countersunk hole, and is fixed with the front cover plate fixing nut 4 and the front cover plate anti-loosening nut 3; the threaded steel pipe 11 is fitted with the rear cover plate 6 through a countersunk hole, and is fixed with the rear cover plate fixing nut 7 and the rear cover plate anti-loosening nut 8. The stepped shaft-shaped tool holder is located at the front center of the front cover plate 5.

[0010] Further optimized technical solutions, Two longitudinally curved dual-mode oscillators 10 are symmetrically distributed in the overall structure, and the preferred materials are magnetostrictive materials with negative magnetostriction coefficients, such as cobalt ferrite; two bias coil frames 12 are symmetrically distributed in the overall structure.

[0011] An operating method for a magnetostrictive ultrasonic longitudinal bending dual-mode cutting device, based on the aforementioned magnetostrictive ultrasonic longitudinal bending dual-mode cutting device, includes the following specific steps: Step 1: Mount the magnetostrictive ultrasonic longitudinal bending dual-mode cutting device on the machine tool; Step 2: Apply a predetermined direct current to the two bias coils on the two bias coil holders 12 respectively; Step 3: Apply alternating current to the excitation coil on the excitation coil frame 9; This results in longitudinal vibration mode cutting, bending vibration mode cutting, or alternating longitudinal vibration mode and bending vibration mode cutting.

[0012] Further optimized technical solutions, The longitudinal vibration mode cutting is as follows: DC currents of the same direction and magnitude are passed to the bias coils of the two bias coil frames 12. At this time, the two longitudinal bending dual-mode oscillators 10 are subjected to the same bias magnetic field. Then, AC current is passed to the excitation coil frame 9, and the excitation coil generates a driving magnetic field. The two longitudinal bending dual-mode oscillators 10 are subjected to the same driving excitation. The vibration mechanical energy is amplified and focused by the stepped amplitude-changing structure of the stepped shaft-shaped tool holder on the front cover plate 5 and then transmitted to the tool 2 for output.

[0013] Further optimized technical solutions, The bending vibration mode cutting is as follows: direct current in opposite directions or direct current in the same direction but different magnitudes is passed to the bias coils of the two bias coil frames 12, so that the two longitudinal bending dual-mode oscillators 10 are in different bias magnetic fields; then alternating current is passed to the excitation coil frame 9, the excitation coil generates a driving magnetic field, and the two longitudinal bending dual-mode oscillators 10 are subjected to the same driving excitation, but because the bias is different, the longitudinal vibration is different. The vibration mechanical energy is amplified and focused by the stepped amplitude-changing structure of the stepped shaft-shaped tool holder on the front cover plate 5 and then transmitted to the tool 2 for output.

[0014] A method for increasing the strength of an ultrasonic longitudinal bending dual-mode cutting device, based on the aforementioned magnetostrictive ultrasonic longitudinal bending dual-mode cutting device, wherein the magnetostrictive material has a negative magnetostriction coefficient, and the pre-stretching assembly scheme is as follows: Step 1: First, connect the longitudinal bending dual-mode oscillator 10 to the rear cover plate 6. The two longitudinal bending dual-mode oscillators 10 are connected to the rear cover plate 6 through rectangular connecting holes. The rear cover plate fixing nut 7 is used to fix the threaded steel pipe 11 initially. Step 2: Insert the bias coil frame 12 onto the outside of the longitudinal bending dual-mode oscillator 10, and then place the bias coil on the bias coil frame 12 to complete the connection between the bias coil frame 12, the longitudinal bending dual-mode oscillator 10, and the rear cover plate 6; then put on the excitation coil frame 9, and place the excitation coil on the excitation coil frame 9 to complete the connection between the excitation coil frame 9 and the rear cover plate 6. Step 3: Connect the front cover plate 5 with the longitudinal bending dual-mode oscillator 10. The longitudinal bending dual-mode oscillator 10 is connected to the front cover plate 5 through a rectangular connecting hole. The front cover plate fixing nut 4 is used to initially fix the threaded steel pipe 11. Step 4, the pre-stretching scheme is to first perform a pre-stretching operation on the threaded steel pipe 11 in the countersunk hole, tighten the front cover plate fixing nut 4 inward to fix it, and screw in the front cover plate anti-loosening nut 3 to prevent loosening; then perform a pre-stretching operation on the threaded steel pipe 11 in the countersunk hole, tighten the rear cover plate fixing nut 7 inward to fix it, and screw in the rear cover plate anti-loosening nut 8 to prevent loosening. Step 5: The cutter 2 engages with the threaded connection hole and is fixed to the front cover plate 5 by the fixing bolt 1.

[0015] Further optimized technical solutions, After the threaded steel pipe 11 is pre-stretched, the longitudinal bending dual-mode vibrator 10 is tightly fitted with the front cover plate 5 and the rear cover plate 6, maintaining the pre-stretched state of the two longitudinal bending dual-mode vibrators 10.

[0016] According to the working conditions and the processing needs of the workpiece, the present invention can freely switch between the longitudinal vibration mode and the bending vibration mode of the processing device by adjusting the DC current of the bias coil at the bias coil frame 12, thereby improving the accuracy of the processed surface and the flexibility of the processing tool. Attached Figure Description

[0017] The invention will be further understood from the following description taken in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale, but rather the emphasis is on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0018] Figure 1 This is a schematic diagram of the overall structure of the cutting device of the present invention.

[0019] Figure 2 This is an exploded view of the cutting device of the present invention.

[0020] Figure 3 This is a schematic diagram showing the connection between the dual-mode oscillator of the pre-embedded steel pipe of the present invention and the bias coil frame and drive coil frame.

[0021] Figure 4 This is an exploded view of the dual-mode oscillator with pre-embedded steel pipe, the bias coil frame, and the drive coil frame of the present invention.

[0022] Figure 5 This is a top view of the front cover plate of the present invention.

[0023] Figure 6 This is a front view schematic diagram of the front cover plate of the present invention.

[0024] Figure 7 This is a front view schematic diagram of the rear cover plate of the present invention.

[0025] Figure 8 This is a rear view schematic diagram of the rear cover plate of the present invention.

[0026] Figure 9This is a schematic diagram showing the direction of motion of the oscillator of the present invention after being excited by a magnetic field, resulting in contraction deformation and recovery.

[0027] Figure 10 This is a schematic diagram of the magnetic field distribution under the longitudinal vibration mode of the present invention.

[0028] Figure 11 This is a schematic diagram illustrating the working principle of the longitudinal vibration mode of the present invention.

[0029] Figure 12 This is a schematic diagram of the magnetic field distribution during the bending vibration mode of the present invention.

[0030] Figure 13 This is a schematic diagram illustrating the working principle of the bending vibration mode of the present invention.

[0031] The following is given Figures 1-13 Codes for the main components: 1- Tool fixing bolt, 2- Tool, 3- Front cover plate anti-loosening nut, 4- Front cover plate fixing nut, 5- Front cover plate, 6- Rear cover plate, 7- Rear cover plate fixing nut, 8- Rear cover plate anti-loosening nut, 9- Excitation coil frame, 10- Longitudinal bending dual-mode vibrator, 11- Threaded steel pipe, 12- Offset coil frame. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] In this invention, the terms "first" and "second" do not represent a specific quantity or order, but are merely used to distinguish names.

[0036] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0037] Cobalt ferrite, under the excitation of a high-frequency magnetic field, can produce periodic contraction and recovery, thus forming high-frequency vibrations, with the direction of motion as follows: Figure 9 As shown, this characteristic can be applied to the research of ultrasonic transducers. The purpose of this invention is to comprehensively utilize both longitudinal and bending vibration modes to improve the machining accuracy and flexibility of ultrasonic machining tools, improve the machining quality of workpiece surfaces, and broaden the design scheme of ultrasonic cutting processing devices. At the same time, it provides an innovative structure of a magnetostrictive ultrasonic cutting device based on cobalt ferrite material with both longitudinal and bending modes.

[0038] The technical solution adopted by the present invention to solve its technical problem is: a magnetostrictive ultrasonic longitudinal bending dual-mode cutting device based on cobalt ferrite, comprising: at least one tool fixing bolt 1 for fixing the tool 2, a tool 2, two front cover plate anti-loosening nuts 3, two front cover plate fixing nuts 4, a front cover plate 5, a rear cover plate 6, two rear cover plate fixing nuts 7, two rear cover plate anti-loosening nuts 8, an excitation coil frame 9 and an excitation coil, two longitudinal bending dual-mode vibrators 10, two threaded steel pipes 11, and two bias coil frames 12 and bias coils.

[0039] like Figure 1 , 2 As shown, the front end of the front cover plate 5 is provided with a stepped shaft-shaped tool holder, with chamfers or rounded corners between each step; the front end of the stepped shaft-shaped tool holder is provided with a tool mounting head, which has a threaded connection hole. The tool 2 mates with the threaded connection hole and is fixed to the front cover plate 5 by the tool fixing bolt 1.

[0040] like Figure 6 As shown, the front cover plate 5 has two countersunk holes at its front end; Figure 5 As shown, the rear end of the front cover plate 5 has two rectangular connecting holes. These two rectangular connecting holes are used to connect to one end of the two longitudinally bent dual-mode oscillators 10. The two countersunk holes and the two rectangular connecting holes are interconnected. Figure 7 As shown, the front end of the rear cover plate 6 has two rectangular connecting holes, which are used to connect to the other end of the two longitudinally bent dual-mode oscillators 10; as Figure 8 As shown, the rear end of the rear cover plate 6 has two countersunk holes, and the two countersunk holes and the two rectangular connecting holes are interconnected.

[0041] like Figure 3 , 4As shown, threaded steel pipes 11 are pre-embedded within longitudinally bent dual-mode oscillators 10, forming a rigid connection. Both ends of the threaded steel pipes 11 extend from both ends of the longitudinally bent dual-mode oscillators 10. Each of the two pre-embedded threaded steel pipes 11 in the longitudinally bent dual-mode oscillators 10 is externally fitted with an offset coil frame 12 and an offset coil. An excitation coil frame 9 and an excitation coil are also fitted outside the two offset coil frames 12. The longitudinally bent dual-mode oscillators 10 mate with the front cover plate 5 and the rear cover plate 6 respectively through rectangular connecting holes. The threaded steel pipes 11 mate with the front cover plate 5 through countersunk holes, secured with front cover plate fixing nuts 4 and anti-loosening nuts 3. The threaded steel pipes 11 mate with the rear cover plate 6 through countersunk holes, secured with rear cover plate fixing nuts 7 and anti-loosening nuts 8.

[0042] The longitudinal vibration mode realization scheme of the magnetostrictive ultrasonic cutting device is as follows: Direct current of the same direction and equal magnitude is applied to the bias coils of the two bias coil frames 12. At this time, the two longitudinal bending dual-mode oscillators 10 are subjected to the same bias magnetic field. Then, alternating current is applied to the excitation coil frame 9, and the excitation coil generates a driving magnetic field, so the two longitudinal bending dual-mode oscillators 10 are subjected to the same driving excitation. For example... Figure 10 As shown, they produce the same stretching and contracting deformation, thus resulting in the same longitudinal vibration. Figure 11 As shown, the vibration mechanical energy is amplified and focused by the stepped amplitude-changing structure of the stepped shaft-shaped tool holder on the front cover plate 5, and then transmitted to the tool 2 for output, ultimately forming the longitudinal vibration processing of the processing device.

[0043] The scheme for realizing the bending vibration mode of the magnetostrictive ultrasonic cutting device involves supplying direct current in opposite directions or direct current in the same direction but different magnitudes to the bias coils of the two bias coil frames 12, so that the two longitudinal bending dual-mode oscillators 10 are in different bias magnetic fields. Then, alternating current is supplied to the excitation coil frame 9, and the excitation coil generates a driving magnetic field. Figure 12 As shown, the two longitudinal bending dual-mode oscillators 10 are subjected to the same driving excitation, but due to different biases, the amount of expansion and contraction deformation they produce at each moment is not necessarily the same, resulting in different longitudinal vibrations. Figure 13 As shown, the vibration mechanical energy is amplified and focused by the stepped amplitude-changing structure of the stepped shaft-shaped tool holder on the front cover plate 5, and then transmitted to the tool 2 for output, ultimately forming the bending vibration processing of the processing device.

[0044] The two longitudinally curved dual-mode oscillators 10 of the magnetostrictive ultrasonic cutting device are symmetrically distributed in the overall structure, and the materials are preferably magnetostrictive materials with negative magnetostriction coefficients, such as cobalt ferrite. The two bias coil frames 12 of the magnetostrictive ultrasonic cutting device are symmetrically distributed in the overall structure; the materials of the bias coil frames 12 and the excitation coil frame 9 are preferably plastic, ceramic, wood, or metal.

[0045] For the cutting tool 2, the preferred materials are diamond, cemented carbide, and high-speed steel. For the front cover plate 5, rear cover plate 6, threaded steel pipe 11, connecting bolts, and connecting nuts, the preferred materials are stainless steel, non-magnetic steel, and bearing steel.

[0046] The two longitudinally curved dual-mode oscillators 10 of the magnetostrictive ultrasonic cutting device are made of magnetostrictive materials with negative magnetostriction coefficients. After being subjected to bias and excitation by a magnetic field, they exhibit periodic inward contraction and recovery, such as... Figure 9 As shown, this results in vibration. If the oscillator is pre-stretched before being excited, it will increase the magnetostrictive properties of the oscillator, generate a larger amplitude, and ultimately increase the output performance of the ultrasonic cutting device. A pre-stretch assembly scheme is proposed: the assembly sequence of the main components is as follows: first, the longitudinal bending dual-mode oscillator 10 is connected to the rear cover plate 6. The two longitudinal bending dual-mode oscillators 10 are connected to the rear cover plate 6 through rectangular connecting holes, and the rear cover plate fixing nut 7 is used to fix the threaded steel pipe 11 for initial fixation; then, the bias coil frame 12 is inserted on the outside of the longitudinal bending dual-mode oscillator 10, and the bias coil is placed on the bias coil frame 12 to complete the connection between the bias coil frame 12, the longitudinal bending dual-mode oscillator 10, and the rear cover plate 6; then, the excitation coil frame 9 and the excitation coil are put on, and the excitation coil frame 9 is connected to the rear cover plate 6; finally, the front cover plate 5 is connected to the longitudinal bending dual-mode oscillator 10. The longitudinal bending dual-mode oscillator 10 is connected to the front cover plate 5 through rectangular connecting holes, and the front cover plate fixing nut 4 is used to fix the threaded steel pipe 11 for initial fixation. The pre-tensioning procedure involves first pre-tensioning the threaded steel pipe 11 inside the countersunk hole, then tightening the front cover plate fixing nut 4 inwards for fixation, and finally screwing in the front cover plate anti-loosening nut 3 to prevent loosening. Next, the threaded steel pipe 11 inside the countersunk hole is pre-tensioned, then the rear cover plate fixing nut 7 inwards for fixation, and finally screwing in the rear cover plate anti-loosening nut 8 to prevent loosening. The cutting tool 2 engages with the threaded connection hole and is fixed to the front cover plate 5 by the fixing bolt 1.

[0047] When the magnetostrictive ultrasonic cutting device performs a pre-stretching operation on the longitudinal bending dual-mode oscillator 10, the pre-stretching method is not limited. It can be based on the necessary gap in the pre-stretching. As long as the pre-stretching is completed, it can ensure that the structure of the longitudinal bending dual-mode oscillator 10 does not suffer tensile damage, the longitudinal bending dual-mode oscillator 10 is in close contact with the front cover plate 5 and the rear cover plate 6, and the longitudinal bending dual-mode oscillator 10 maintains the pre-stretched state, etc.

[0048] The magnetostrictive ultrasonic cutting device can be firmly clamped on the machine tool by a clamp. The size and specifications of the clamp need to be selected according to the size of the device to ensure stable clamping of the cutting device.

[0049] Before processing, the magnetostrictive ultrasonic cutting device is securely clamped onto the machine tool using a fixture. A predetermined DC current is supplied to the bias coil on the bias coil holder 12, and an AC current is supplied to the excitation coil on the excitation coil holder 9. The ultrasonic cutting device then enters normal operating mode. Depending on the working conditions and the processing requirements of the workpiece, the longitudinal vibration mode and bending vibration mode of the processing device can be freely switched by adjusting the DC current of the bias coil at the bias coil holder 12, thereby improving the accuracy of the processed surface and the flexibility of the processing tool.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A magnetostrictive ultrasonic longitudinal-bending dual-mode cutting device, characterized in that: the longitudinal-bending dual-mode cutting device has a longitudinal-bending dual-mode body, a stepped shaft-shaped tool seat is arranged at the front end of the longitudinal-bending dual-mode body, a chamfer or a round corner is arranged between each step, a tool mounting head is arranged at the front end of the stepped shaft-shaped tool seat, a threaded connection hole is opened on the tool mounting head, a tool 2 is matched with the threaded connection hole, and the tool 2 is fixed on the tool mounting head through a tool fixing bolt 1. 2.The magnetostrictive ultrasonic longitudinal-bending dual-mode cutting device according to claim 1, characterized in that: the longitudinal-bending dual-mode body has two threaded steel pipes 11 inside, each threaded steel pipe 11 is respectively embedded in a longitudinal-bending dual-mode vibrator 10, a rigid connection is formed, and the two ends of the threaded steel pipe 11 extend out of the two ends of the longitudinal-bending dual-mode vibrator 10; the longitudinal-bending dual-mode vibrator 10 of each of the two embedded threaded steel pipes 11 is respectively sleeved with a biasing coil holder 12, and a biasing coil is arranged on the biasing coil holder 12; an excitation coil holder 9 is sleeved on the outer layer of the two biasing coil holders 12, and an excitation coil is arranged on the excitation coil holder 12. 3.The magnetostrictive ultrasonic longitudinal-bending dual-mode cutting device according to claim 2, characterized in that: the longitudinal-bending dual-mode body further has a front cover plate 5 and a rear cover plate 6; two counterbores are opened at the front end of the front cover plate 5, two rectangular connecting holes are opened at the rear end of the front cover plate 5; two rectangular connecting holes are opened at the front end of the rear cover plate 6, and two counterbores are opened at the rear end of the rear cover plate 6; the longitudinal-bending dual-mode vibrator 10 is matched with the front cover plate 5 and the rear cover plate 6 through the rectangular connecting holes respectively. 4.The magnetostrictive ultrasonic longitudinal-bending dual-mode cutting device according to claim 3, characterized in that: the threaded steel pipe 11 is matched with the front cover plate 5 through the counterbores, is fixed by a front cover plate fixing nut 4, and is prevented from loosening by a front cover plate anti-loosening nut 3; the threaded steel pipe 11 is matched with the rear cover plate 6 through the counterbores, is fixed by a rear cover plate fixing nut 7, and is prevented from loosening by a rear cover plate anti-loosening nut 8; the stepped shaft-shaped tool seat is arranged at the middle part of the front end of the front cover plate 5. 5.The magnetostrictive ultrasonic longitudinal-bending dual-mode cutting device according to claim 4, characterized in that: the two longitudinal-bending dual-mode vibrators 10 are symmetrically distributed in the overall structure, and a magnetostrictive material with a negative magnetostrictive coefficient such as cobalt ferrite is preferentially selected as the material; the two biasing coil holders 12 are symmetrically distributed in the overall structure. 6.An operation method of a magnetostrictive ultrasonic longitudinal-bending dual-mode cutting device, characterized in that: the operation method of the magnetostrictive ultrasonic longitudinal-bending dual-mode cutting device based on any one of claims 1-5 comprises the following steps: Step 1: clamping the magnetostrictive ultrasonic longitudinal-bending dual-mode cutting device on a machine tool; Step 2: respectively inputting predetermined direct currents into two biasing coils on two biasing coil holders 12; Step 3: inputting an alternating current into an excitation coil on an excitation coil holder 9; Thus, longitudinal vibration mode cutting or bending vibration mode cutting or longitudinal vibration mode and bending vibration mode alternating cutting is formed. 7.The operation method of the magnetostrictive ultrasonic longitudinal-bending dual-mode cutting device according to claim 6, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ The longitudinal vibration mode cutting is that the same direction and equal size direct current is input to the biasing coils of the two biasing coil frames 12, at this time the two longitudinal bending double-mode vibrators 10 are affected by the same biasing magnetic field; then the alternating current is input to the excitation coil frame 9, the excitation coil generates a driving magnetic field, and the two longitudinal bending double-mode vibrators 10 are affected by the same driving excitation; the vibration mechanical energy is amplified and focused through the stepped amplitude structure of the stepped shaft-shaped tool seat on the front cover plate 5, and then transmitted to the tool 2 for output.

8. The operating method of the magnetostrictive ultrasonic longitudinal bending double-mode cutting device according to claim 6, characterized in that: The bending vibration mode cutting is that the opposite direction direct current or the same direction but different size direct current is input to the biasing coils of the two biasing coil frames 12, so that the two longitudinal bending double-mode vibrators 10 are in different biasing magnetic fields; then the alternating current is input to the excitation coil frame 9, the excitation coil generates a driving magnetic field, and the two longitudinal bending double-mode vibrators 10 are affected by the same driving excitation, but because of the different biasing effects, the longitudinal vibrations are different, the vibration mechanical energy is amplified and focused through the stepped amplitude structure of the stepped shaft-shaped tool seat on the front cover plate 5, and then transmitted to the tool 2 for output.

9. A method for increasing the ultrasonic longitudinal bending double-mode cutting device, characterized in that: The magnetostrictive ultrasonic longitudinal bending double-mode cutting device according to any one of claims 1-5, the magnetostrictive material has a negative magnetostrictive coefficient, and the pre-tension assembly scheme is: Step 1, first, the longitudinal bending double-mode vibrator 10 is connected with the rear cover plate 6, the two longitudinal bending double-mode vibrators 10 are connected with the rear cover plate 6 through the rectangular connecting hole, and the rear cover plate fixing nut 7 cooperates with the threaded steel pipe 11 to be initially fixed; Step 2, the biasing coil frame 12 is sleeved outside the longitudinal bending double-mode vibrator 10, the biasing coil is sleeved on the biasing coil frame 12, the cooperation of the biasing coil frame 12 with the longitudinal bending double-mode vibrator 10 and the rear cover plate 6 is completed, and then the excitation coil frame 9 is sleeved, the excitation coil is sleeved on the excitation coil frame 9, and the cooperation of the excitation coil frame 9 with the rear cover plate 6 is performed; Step 3, the front cover plate 5 is cooperated with the longitudinal bending double-mode vibrator 10, the longitudinal bending double-mode vibrator 10 is cooperated with the front cover plate 5 through the rectangular connecting hole, and the front cover plate fixing nut 4 cooperates with the threaded steel pipe 11 to be initially fixed; Step 4, the pre-tension scheme is that the threaded steel pipe 11 in the counterbore is pre-tensioned, the front cover plate fixing nut 4 is tightened inward to be fixed, and the front cover plate anti-loose nut 3 is screwed to be anti-loose; then the threaded steel pipe 11 in the counterbore is pre-tensioned, the rear cover plate fixing nut 7 is tightened inward to be fixed, and the rear cover plate anti-loose nut 8 is screwed to be anti-loose; Step 5, the tool 2 is cooperated with the threaded connecting hole, and is fixed on the front cover plate 5 through the fixing bolt 1.

10. The method for increasing the ultrasonic longitudinal bending double-mode cutting device according to claim 9, characterized in that: After the threaded steel pipe 11 is pre-tensioned, the longitudinal bending double-mode vibrator 10 is tightly attached to the front cover plate 5 and the rear cover plate 6, and the pre-tension state of the two longitudinal bending double-mode vibrators 10 is maintained.

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