A kind of magnetostrictive material cutting processing device and preparation method of cutting type magnetostrictive material

Abstract

The application provides a magnetostrictive material cutting processing device and a preparation method of a cutting type magnetostrictive material. The cutting processing device comprises a base and a fixing assembly. The base comprises a horizontal bottom plate and a vertical plate arranged on one side of the horizontal bottom plate, and a plurality of fixing holes are formed in the vertical plate. The fixing assembly comprises an intermediate shaft, and at least two fixing arms are rotatably arranged on the intermediate shaft and can independently rotate around the intermediate shaft as the rotation center. A plurality of first through holes are formed in the fixing arms along a direction perpendicular to the vertical plate, and the fixing arms and the vertical plate are detachably connected through the first through holes and the fixing holes. In the cutting processing, the accurate cutting processing of the cylindrical magnetostrictive rod can be realized without losing the initial spatial position, the size reference of the cutting is consistent, secondary clamping and tool setting are not needed, the cutting structure size consistency is good, and the use performance of the magnetostrictive material is improved.

Description

Technical Field

[0001] This invention belongs to the field of precision processing technology of magnetic functional materials, specifically relating to a slit-cutting processing device for magnetostrictive materials and a method for preparing slit-cut magnetostrictive materials. Background Technology

[0002] Underwater acoustic transducers are the core actuators of high-power underwater acoustic systems, converting electrical signals into acoustic signals to achieve underwater detection, communication, and countermeasures. In low-frequency, high-power underwater acoustic transducers, rare-earth magnetostrictive materials (such as Tb-Dy-Fe alloys) are the preferred driving element due to their extremely high energy density and excellent magnetostriction coefficient. These transducers typically employ a composite rod structure, with permanent magnets or magnetic blocks clamped at both ends of a magnetostrictive material rod to provide a bias magnetic field. Simultaneously, high-strength prestressed bolts are inserted along the central axis of the rod, applying an axial preload of 10-20 MPa to ensure the material remains under compression under alternating excitation, preventing brittle fracture caused by tensile stress and improving the linearity of the dynamic response.

[0003] However, under alternating magnetic field driving, significant eddy current losses occur within the magnetostrictive material rod. Due to the material's high electrical conductivity, eddy currents not only induce Joule heating leading to temperature rise and thermal drift in magnetostrictive properties, but their skin effect also causes the effective magnetic flux penetration depth to decrease sharply with increasing frequency, severely limiting the transducer's output efficiency and operational stability under high-frequency, high-power conditions above several hundred Hertz. To suppress eddy current losses, the current main technical approach is to fabricate slit structures on the bulk material, breaking the eddy current loops and reducing the effective loop area, thereby significantly reducing dynamic losses without significantly reducing the magnetostrictive cross-sectional area. Meanwhile, considering the inherent hardness and brittleness of magnetostrictive materials, engineering primarily relies on wire electrical discharge machining (EDM).

[0004] However, in actual mass production, existing processing techniques have significant technical limitations. Traditional wire EDM involves first clamping the end face of the rod, suspending one side for cutting, and then cutting the other side a second time. This method requires secondary clamping and tool setting, inevitably introducing positioning errors. The kerfs from the two cuts are significantly misaligned in space, resulting in poor consistency and symmetry. This not only causes localized stress concentration when the transducer is under pressure but also disrupts the uniformity of magnetic flux distribution within the material, leading to a decrease in effective magnetostrictive strain and a significant reduction in the electromechanical coupling coefficient. If the material is fixed with an adhesive, which is typically a non-conductive dielectric material, a dielectric discontinuity is introduced during EDM. When cutting to the adhesive location, the abrupt change in conductivity between the upper and lower regions causes frequent short circuits, high-frequency wire breakage, or severe arc burns at the bottom of the workpiece, resulting in deteriorated kerf edge quality or even product scrap, leading to an extremely low finished product yield.

[0005] Therefore, there is a need to provide a slit-cutting device for magnetostrictive materials and a method for preparing slit-cut magnetostrictive materials, so as to solve the problems of slit mismatch and positioning error in slit-cutting of magnetostrictive materials and improve dimensional accuracy. Summary of the Invention

[0006] The purpose of this invention is to provide a slit-cutting device for magnetostrictive materials and a method for preparing slit-cut magnetostrictive materials, so as to achieve process consistency in slit-cutting, solve the problems of mismatched gaps and positioning errors in slit-cutting of magnetostrictive materials, improve dimensional accuracy, and meet the high reliability assembly requirements of high-power underwater acoustic transducers.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a kerf-cutting apparatus for magnetostrictive materials, the kerf-cutting apparatus comprising:

[0009] A base and a fixing component, wherein the fixing component is connected to the base for fixing the magnetostrictive material to be processed;

[0010] The base includes a horizontal base plate and a vertical plate disposed on one side of the horizontal base plate, and the vertical plate is provided with a plurality of fixing holes;

[0011] The fixing component includes: an intermediate shaft for mounting and fixing the magnetostrictive material to be processed; at least two fixing arms are rotatably mounted on the intermediate shaft, which can rotate independently around the intermediate shaft as the rotation center; the fixing arms are provided with a plurality of first through holes along the direction perpendicular to the upright plate; the fixing arms and the upright plate are detachably connected through the first through holes and fixing holes.

[0012] Preferably, the fixing holes and the first through holes are independently arranged in an array.

[0013] Preferably, a second through hole extending toward the intermediate shaft is provided on the end face of the fixed arm away from the intermediate shaft, for inserting a detachable fastener to abut against the surface of the intermediate shaft, so as to restrict the rotation of the intermediate shaft relative to the fixed arm.

[0014] Preferably, on the outer circumferential surface of the intermediate shaft, at the location of the fixing arm, two grooves are formed opposite to each other for abutting the end of the fastener inserted into the second through hole.

[0015] Preferably, the intermediate shaft is provided with a plurality of limiting protrusions, which are respectively disposed at both ends of each fixed arm to limit the movement of the fixed arm along the axial direction of the intermediate shaft.

[0016] Preferably, the horizontal base plate has several countersunk holes for mounting a wire cutting machine.

[0017] Preferably, a U-shaped groove is provided on the side of the horizontal base plate connected to the vertical plate, dividing the vertical plate into two parts on both sides of the U-shaped groove, which provides running space for the electrode wire of wire cutting and facilitates the discharge of cutting waste liquid and slag.

[0018] Preferably, the fixing component further includes an auxiliary adjustment component for assisting in fixing the magnetostrictive material.

[0019] Preferably, the auxiliary adjustment component includes two adjustment frames, namely an upper adjustment frame and a lower adjustment frame; the two adjustment frames are rotatably connected to the intermediate shaft and are respectively disposed at both ends of the magnetostrictive material. The two adjustment frames are connected by a support column to assist in fixing the magnetostrictive material.

[0020] Preferably, the end face of the adjustment frame away from the intermediate shaft has a third through hole extending toward the intermediate shaft, for inserting a detachable fastener to abut against the surface of the intermediate shaft, so as to restrict the rotation of the intermediate shaft relative to the adjustment frame.

[0021] Preferably, the intermediate shaft includes a material fixing part and two positioning parts located at both ends of the material fixing part; the material fixing part is used to install and fix the magnetostrictive material; the fixing arm and the auxiliary adjustment component are disposed on the positioning part; the material fixing part and the two positioning parts form a detachable connection to facilitate the installation and removal of the magnetostrictive material.

[0022] Secondly, the present invention provides a method for preparing a slit-type magnetostrictive material, using the slit-processing apparatus for magnetostrictive materials described in the first aspect, the preparation method comprising the following steps:

[0023] (1) Hole the magnetostrictive material rod to be processed to form a central through hole along the central axis of the rod;

[0024] (2) The magnetostrictive material rod with a central through hole is installed in the magnetostrictive material slit cutting device for slit cutting; the slit cutting process includes: installing the rod on the intermediate shaft and fixing it, fixing two fixed arms on the vertical plate on one side of the intermediate shaft, and cutting slits one by one on the side of the rod relative to the fixed arms; then, first disassembling one of the fixed arms, rotating it 180° around the intermediate shaft to the vertical plate on the other side of the intermediate shaft and fixing it, then disassembling the other fixed arm, rotating it to the vertical plate on the other side of the intermediate shaft and fixing it, and processing the side of the rod relative to the fixed arms; a number of slits extending along the axial direction of the rod are formed on the magnetostrictive material rod, and each slit is distributed along the circumference of the rod;

[0025] (3) Inject glue into the magnetostrictive material rod after the slit cutting is completed;

[0026] (4) The surface of the magnetostrictive material rod after glue injection is ground and straightened to obtain the slit magnetostrictive material.

[0027] The preparation method of the present invention can prepare a slotted magnetostrictive material with circumferentially distributed slits. A central through hole for transducer assembly is pre-formed on the slotted magnetostrictive rod, and slits are formed on the dimensional reference of the central through hole. The slits have high structural dimensional accuracy and low material form and position tolerance, thereby improving the application performance of the slotted magnetostrictive material.

[0028] Preferably, the hole-cutting step (1) is performed using a hole-cutting machine.

[0029] Preferably, the cutting method in step (2) includes wire electrical discharge machining.

[0030] Preferably, the glue injection process in step (3) includes: cleaning the magnetostrictive rod, blocking the central through hole, placing the glue injection reagent at one end of the magnetostrictive rod, and forming a vacuum state at the other end of the magnetostrictive rod to allow the glue injection reagent to penetrate into the cut, and then curing it.

[0031] Preferably, the reagents used for injection in step (3) include: epoxy resin, acetone and defoamer.

[0032] Preferably, in step (4), a slit-type magnetostrictive material straightening and fixing device is used to straighten and fix the magnetostrictive material rod, wherein the straightening and fixing device includes:

[0033] A base, on which a V-shaped correction block, a baffle, and a guide assembly are provided;

[0034] The V-shaped straightening block is fixedly installed on the base, and a plurality of V-shaped grooves are formed on the side surface of the V-shaped straightening block near the baffle. The baffle is movably disposed on the base, and a plurality of receiving spaces are formed between the baffle and the V-shaped straightening block. The receiving spaces are used to place magnetostrictive material rods. The guide assembly is connected to the baffle and is used to drive the baffle to move towards or away from the V-shaped straightening block to apply pressure to the material, thereby fixing and straightening the material in the receiving spaces.

[0035] Preferably, the guide assembly includes a guide shaft and a handwheel, one end of the guide shaft is connected to the handwheel, and the other end abuts against the baffle.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The slit cutting device and method of the present invention can achieve precise slit cutting of cylindrical magnetostrictive rods without losing the initial spatial position during slit cutting. The dimensional reference of the slit cutting remains consistent, eliminating the need for secondary clamping and tool setting. The slit structure has good dimensional consistency, thus improving the performance of magnetostrictive materials. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the magnetostrictive material slit cutting device provided in Example 1;

[0039] Figure 2 This is a front view structural schematic diagram of the magnetostrictive material slit cutting device provided in Example 1;

[0040] Figure 3 This is a side view of the magnetostrictive material slit cutting device provided in Example 1;

[0041] Among them, 1 is the base; 2 is the intermediate shaft; 3 is the fixed arm; 4 is the adjusting frame; and 5 is the support column.

[0042] Figure 4 This is a schematic diagram of the straightening and fixing device for the slit-type magnetostrictive material provided in Example 2;

[0043] Among them, 6 is the base; 7 is the V-shaped correction block; 8 is the copper pad; 9 is the baffle; 10 is the guide shaft; and 11 is the handwheel.

[0044] Figure 5 This is a process flow diagram of the slit processing procedure in the preparation method of the slit magnetostrictive material provided in Example 3.

[0045] Figure 6 This is a schematic diagram of the glue injection process for the preparation method of the slit-type magnetostrictive material provided in Example 3.

[0046] Figure 7 This is a schematic diagram of the slit-type rare-earth magnetostrictive material prepared in Example 3. Detailed Implementation

[0047] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0048] In one specific embodiment, the present invention provides a kerf-cutting apparatus for magnetostrictive materials, the apparatus comprising:

[0049] A base and a fixing assembly connected to the base for fixing the magnetostrictive material to be processed.

[0050] The base includes a horizontal base plate and a vertical plate extending upwards along one side of the horizontal base plate, forming an L-shaped component. The vertical plate has several fixing holes that penetrate the plate perpendicular to it, for connection and fixation with a fixing component in the kerf cutting device.

[0051] The fixing component includes an intermediate shaft for mounting and fixing the magnetostrictive material to be processed. During kerf cutting, the magnetostrictive material with a central through hole is fitted onto the intermediate shaft and fixed to prevent movement of the magnetostrictive material.

[0052] At least two fixed arms are rotatably mounted on the intermediate shaft, which can rotate independently around the intermediate shaft as the rotation center. The fixed arms are used to connect and fix to the upright plate on the base.

[0053] The fixed arm has several first through holes along the direction perpendicular to the vertical plate. The two fixed arms and the vertical plate are detachably connected by fasteners passing through the first through holes and the fixed holes, thereby realizing the installation and fixation of the intermediate shaft on the base.

[0054] In this invention, the form of detachable connection is not limited; as an example, it can be a threaded fastener.

[0055] When slit cutting is performed on magnetostrictive materials, two fixed arms are connected and fixed to a vertical plate on one side of the intermediate shaft. At this point, the magnetostrictive material is exposed on one side relative to the fixed arms, allowing for one-time slit cutting of each slit on the exposed side. After the front side is cut, one fixed arm is disassembled, rotated 180° around the intermediate shaft to the vertical plate on the other side of the intermediate shaft, and then connected and fixed. Then, the other fixed arm is disassembled, and similarly rotated 180° around its intermediate shaft to the vertical plate on the other side of the intermediate shaft and connected and fixed. At this point, the other side of the magnetostrictive material is exposed, and slit cutting is then performed, thus achieving slit cutting of the magnetostrictive material along its circumference. Using this device, each slit can be cut in one go. Furthermore, by disassembling and fixing the two fixed arms one by one, the orientation of the magnetostrictive material remains unchanged. Precise slit cutting of cylindrical rods can be achieved without losing the initial spatial position. The dimensional reference of the slit cutting remains consistent, eliminating the need for secondary clamping and tool setting, and resulting in good dimensional consistency of the slit structure.

[0056] In one specific embodiment, the fixing holes and the first through holes are independently arranged in an array.

[0057] In one specific embodiment, a second through hole extending toward the intermediate shaft is provided on the end face of the fixed arm away from the intermediate shaft, for inserting a detachable fastener to abut against the surface of the intermediate shaft, so as to restrict the rotation of the intermediate shaft relative to the fixed arm.

[0058] In one specific embodiment, two grooves are formed on the outer circumferential surface of the intermediate shaft at the location of the fixing arm, which are used to abut the end of the fastener inserted into the second through hole to improve the stability of the intermediate shaft fixing.

[0059] In one specific embodiment, the intermediate shaft is provided with a plurality of limiting protrusions, which are respectively disposed at both ends of each fixed arm, for limiting the movement of the fixed arm along the axial direction of the intermediate shaft.

[0060] In one specific embodiment, the horizontal base plate has several countersunk holes for mounting a wire cutting machine.

[0061] In one specific embodiment, a U-shaped groove is formed on the side of the horizontal base plate connected to the vertical plate, dividing the vertical plate into two parts on both sides of the U-shaped groove. This provides operating space for the electrode wire of the wire EDM and facilitates the discharge of cutting waste liquid and slag. During kerf cutting, two fixed arms are connected and fixed to the vertical plate on one side of the U-shaped groove. At this time, the intermediate shaft with the magnetostrictive material installed is exactly above the U-shaped groove, which facilitates wire EDM operation. When switching to the other side of the magnetostrictive material for kerf cutting, the two fixed arms are fixed to the vertical plate on the other side of the U-shaped groove.

[0062] In one specific embodiment, the fixing component further includes an auxiliary adjustment component for assisting in fixing the magnetostrictive material.

[0063] In one specific embodiment, the auxiliary adjustment component includes two adjustment frames, namely an upper adjustment frame and a lower adjustment frame; the two adjustment frames are rotatably connected to the intermediate shaft and are respectively disposed at both ends of the magnetostrictive material. The two adjustment frames are connected by a support column and are used to assist in fixing the magnetostrictive material. When the magnetostrictive material is slit, the auxiliary adjustment component is fixed in the direction of the fixed arm to facilitate material processing.

[0064] In one specific embodiment, a third through hole extending toward the intermediate shaft is provided on the end face of the adjustment frame away from the intermediate shaft, for inserting a detachable fastener to abut against the surface of the intermediate shaft, so as to restrict the rotation of the intermediate shaft relative to the adjustment frame.

[0065] In one specific embodiment, the intermediate shaft includes a material fixing part and two positioning parts located at both ends of the material fixing part; the material fixing part is used to install and fix the magnetostrictive material to restrict the material's movement in its axial direction and rotation in its circumferential direction; the fixing arm and the auxiliary adjustment assembly are disposed on the positioning part; the material fixing part and the two positioning parts form a detachable connection to facilitate the installation and removal of the magnetostrictive material.

[0066] In one specific embodiment, the two fixed arms are disposed on a positioning part located at the lower part of the intermediate shaft.

[0067] In one specific embodiment, the present invention provides a method for preparing a slit-type magnetostrictive material, the method comprising the following steps:

[0068] (1) Hole the magnetostrictive material rod to be processed to form a central through hole along the central axis of the rod;

[0069] (2) The magnetostrictive material rod with a central through hole is installed in the above-mentioned magnetostrictive material slit processing device for slit processing; the slit processing process includes: installing the rod on the intermediate shaft and fixing it, fixing two fixing arms on the vertical plate on one side of the intermediate shaft, and performing slit processing on the side of the rod relative to the fixing arms one by one; then, first disassembling one of the fixing arms, rotating it 180° around the intermediate shaft to the vertical plate on the other side of the intermediate shaft and fixing it, then disassembling the other fixing arm, rotating it to the vertical plate on the other side of the intermediate shaft and fixing it, and processing the side of the rod relative to the fixing arm; a number of slits extending along the axial direction of the rod are formed on the magnetostrictive material rod, and each slit is distributed along the circumference of the rod;

[0070] (3) Inject glue into the magnetostrictive material rod after the slit cutting is completed;

[0071] (4) The surface of the magnetostrictive material rod after glue injection is ground and straightened to obtain the slit magnetostrictive material.

[0072] In one specific embodiment, the present invention also provides a straightening and fixing device for a slit-type magnetostrictive material, the straightening and fixing device comprising:

[0073] The base is provided with a V-shaped correction block, a baffle and a guide assembly.

[0074] The V-shaped straightening block is fixedly installed on the base, and a plurality of V-shaped grooves are formed on the side surface of the V-shaped straightening block near the baffle. The baffle is movably disposed on the base, and a plurality of receiving spaces are formed between the baffle and the V-shaped straightening block. The receiving spaces are used to place magnetostrictive material rods. The guide assembly is connected to the baffle and is used to drive the baffle to move towards or away from the V-shaped straightening block to apply pressure to the material, thereby fixing and straightening the material in the receiving spaces.

[0075] In one specific embodiment, the guiding assembly includes a guide shaft and a handwheel. One end of the guide shaft is connected to the handwheel, and the other end abuts against the baffle. During straightening, rotating the handwheel drives the guide shaft to make a feed motion along the axial direction, thereby generating a clamping force on the baffle. The guide shaft and handwheel adopt conventional structures in the art and are not specifically limited thereto.

[0076] Example 1

[0077] This embodiment provides a method such as Figure 1-3 The magnetostrictive material kerfing apparatus shown includes:

[0078] The base 1 and the fixing assembly connected to the base 1 for fixing the magnetostrictive material to be processed.

[0079] The base 1 includes a horizontal base plate and a vertical plate extending upwards along one side of the horizontal base plate. The horizontal base plate has several countersunk holes for mounting a wire EDM machine. A U-shaped groove is formed on the side of the horizontal base plate connected to the vertical plate, dividing the vertical plate into two parts on either side of the U-shaped groove. This groove provides running space for the wire EDM electrode wire and facilitates the discharge of cutting waste liquid and residue. The vertical plate has several fixing holes arranged in an array.

[0080] The fixing assembly includes an intermediate shaft 2, which comprises a material fixing part and two positioning parts located at both ends of the material fixing part. The material fixing part is used to install and fix the magnetostrictive material to restrict the material's axial movement and circumferential rotation. Two fixing arms 3, independently rotatable around the intermediate shaft 2, are provided on the lower positioning part. Each fixing arm 3 has several first through holes perpendicular to the vertical plate, with each first through hole corresponding to a fixing hole. The first through holes and fixing holes are detachably connected by fasteners. A second through hole extending towards the intermediate shaft is provided on the end face of the fixing arm 3 away from the intermediate shaft 2, for inserting a detachable fastener to abut against the surface of the intermediate shaft. On the outer circumferential surface of the intermediate shaft 2, corresponding to the location of the fixing arm 3, two grooves are provided opposite each other to abut against the ends of the fasteners inserted into the second through holes, thereby restricting the rotation of the intermediate shaft relative to the fixing arms. Several limiting protrusions are provided on the intermediate shaft 2, respectively located at both ends of each fixing arm 3, to restrict the movement of the fixing arm along the axial direction of the intermediate shaft.

[0081] The fixing assembly also includes an auxiliary adjustment assembly, which comprises two adjustment frames 4, an upper adjustment frame and a lower adjustment frame. The two adjustment frames 4 are rotatably connected to two positioning parts of the intermediate shaft 2, respectively, and are respectively disposed at both ends of the magnetostrictive material. The two adjustment frames 4 are connected by a support column 5, used to assist in fixing the magnetostrictive material. A third through hole extending towards the intermediate shaft 2 is provided on the end face of the adjustment frame 4 away from the intermediate shaft 2, for inserting a detachable fastener to abut against the surface of the intermediate shaft, thereby limiting the rotation of the intermediate shaft relative to the adjustment frame.

[0082] Example 2

[0083] This embodiment provides a method such as Figure 4 The straightening and fixing device for the slit-type magnetostrictive material shown includes:

[0084] The base 6 is provided with a V-shaped correction block 7, a baffle 9 and a guide assembly.

[0085] The V-shaped correction block 7 is fixedly installed on the base 6, and a number of parallel V-shaped grooves are formed on one side surface of the V-shaped correction block 7; the baffle 9 is movably disposed on the base 6, and a number of straightening spaces are formed between the baffle 9 and the V-shaped correction block 7.

[0086] The guide assembly is used to apply pressure from one side of the baffle 9 toward the V-shaped straightening block 7, thereby fixing and straightening the material in the straightening space. To avoid indentations on the material surface, a copper pad 8 is placed between the material and the baffle 9.

[0087] The guiding assembly includes a guide shaft 10 and a handwheel 11. One end of the guide shaft 10 is connected to the handwheel 11, and the other end abuts against the baffle 9. During straightening, rotating the handwheel 11 drives the guide shaft 10 to make a feed motion along the axial direction, thereby generating a clamping force on the baffle 9.

[0088] Example 3

[0089] This embodiment provides a method for preparing a slotted magnetostrictive material, the method comprising the following steps:

[0090] (1) Use TK3-20G high-precision hole punching machine to punch holes in rare earth magnetostrictive material rods with a hole diameter of 5mm, for use in the assembly of prestressed bolts in underwater acoustic transducers.

[0091] (2) The rare earth magnetostrictive material rod is slit-cut using the slit-cutting device of Example 1, such as... Figure 5 As shown, a rare-earth magnetostrictive material rod with a central through hole is installed on and fixed to the central shaft. Two fixed arms are fixed to a vertical plate on one side of the central shaft. An electrical discharge machine is installed on the base, and the rod is cut slit by slit on one side relative to the fixed arms. Then, one of the fixed arms is disassembled, rotated 180° around the central shaft to the vertical plate on the other side of the central shaft, and fixed. The other fixed arm is then disassembled, rotated to the vertical plate on the other side of the central shaft, and fixed. The rod is then processed on the side relative to the fixed arms. The electrical discharge cutting parameters include: pulse width set to 30, pulse interval set to 15, number of power amplifier tubes turned on to 3, processing voltage selected as high voltage mode, servo tracking parameter to 65, and speed limit parameter to 100.

[0092] (3) The rare earth magnetostrictive material rod was ultrasonically cleaned sequentially with anhydrous ethanol and acetone at a temperature of 50°C, and the continuous cleaning time for a single liquid phase was 30 minutes. The adhesive solution was mixed according to the formula of 3 mL acetone solution and 0.1 g defoamer per 10 g epoxy resin, stirred thoroughly, and then placed in a vacuum chamber for vacuum degassing for 3 minutes. The central through-hole of the magnetostrictive material rod was blocked, the rod was inserted into a polytetrafluoroethylene membrane and placed on a Buchner funnel of a filtration device. The adhesive solution was poured onto one end face of the rare earth magnetostrictive material rod, and a vacuum was drawn on the other end face. Figure 6 As shown, the resin is cured at room temperature for 24 hours after it has penetrated into the cut.

[0093] (4) Grind the outer peripheral side of the rare earth magnetostrictive material rod on a centerless grinder. The initial feed rate is 0.001 mm. After the grinding force is stable, the feed rate is increased to 0.02 mm to correct the cylindricity. Then, install the rare earth magnetostrictive material rod on the straightening and fixing device of Example 2. The outer circular side is close to the V-groove. Rotate the handwheel to push the baffle to press the workpiece and correct the perpendicularity. Under the fixed device, grind the end face with a surface grinder. The initial stage is set to 0.005 mm. After the end face contact area expands and the cutting force is stable, the single feed rate is gradually increased to 0.02 mm. After the end face is finished, the slit magnetostrictive material is obtained.

[0094] In this embodiment, the slit-type magnetostrictive material was prepared with an initial outer diameter of 35.5 mm and an initial height of 57 mm for the blank rod; after processing, the finished rod was obtained, as shown below. Figure 7 As shown, an internal axial through hole with a diameter of 5mm is provided, and the concentricity error of the through hole is ≤0.02mm; the surface roughness Ra of the outer cylindrical surface and the upper and lower end faces is ≤0.8μm; the flatness error of the upper and lower end faces is ≤0.01mm, and the perpendicularity error of the end face relative to the central axis of the outer cylindrical surface is ≤0.01mm; 12 radial slits are uniformly opened in the outer circumferential direction; the width of the slit is 0.18mm, and the width error is ≤0.01mm; the theoretical included angle between any two adjacent extended lines of the slits is 30°, the deviation of the actual included angle from the theoretical included angle is ≤10', and the depth error of the slit is ≤0.01mm.

[0095] In summary, the slit cutting device and method of the present invention can achieve precise slit cutting of cylindrical magnetostrictive rods without losing the initial spatial position during slit processing. The dimensional reference of the slit cutting remains consistent, eliminating the need for secondary clamping and tool setting. The slit structure has good dimensional consistency, thus improving the performance of magnetostrictive materials.

[0096] The above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A magnetostrictive material slitting apparatus, characterized by, The magnetostrictive material slit cutting device includes: A base and a fixing component, wherein the fixing component is connected to the base for fixing the magnetostrictive material to be processed; The base includes a horizontal base plate and a vertical plate disposed on one side of the horizontal base plate, and the vertical plate is provided with a plurality of fixing holes; The fixing component includes: an intermediate shaft for mounting and fixing the magnetostrictive material to be processed; at least two fixing arms are rotatably mounted on the intermediate shaft, which can rotate independently around the intermediate shaft as the rotation center; the fixing arms are provided with a plurality of first through holes along the direction perpendicular to the upright plate; the fixing arms and the upright plate are detachably connected through the first through holes and fixing holes.

2. The magnetostrictive material slitting apparatus of claim 1, wherein, The fixing holes and the first through holes are independently arranged in an array.

3. The magnetostrictive material slitting apparatus of claim 1 or 2, wherein, The fixed arm has a second through hole extending toward the intermediate shaft on its end face away from the intermediate shaft, for inserting a detachable fastener to abut against the surface of the intermediate shaft to restrict the rotation of the intermediate shaft relative to the fixed arm. Preferably, on the outer circumferential surface of the intermediate shaft, at the location of the fixing arm, two grooves are formed opposite to each other for abutting the end of the fastener inserted into the second through hole.

4. The magnetostrictive material slitting apparatus of any one of claims 1-3, wherein, The intermediate shaft is provided with several limiting protrusions, which are respectively located at both ends of each fixed arm to limit the movement of the fixed arm along the axial direction of the intermediate shaft.

5. The slit-cutting apparatus for magnetostrictive materials according to any one of claims 1-4, characterized in that, The horizontal base plate has several countersunk holes for mounting a wire cutting machine; Preferably, a U-shaped groove is provided on the side of the horizontal base plate connected to the vertical plate, dividing the vertical plate into two parts on both sides of the U-shaped groove, which provides running space for the electrode wire of wire cutting and facilitates the discharge of cutting waste liquid and slag.

6. The magnetostrictive material slitting apparatus of any one of claims 1-5, wherein, The fixing component also includes an auxiliary adjustment component for assisting in fixing the magnetostrictive material; Preferably, the auxiliary adjustment component includes two adjustment frames, namely an upper adjustment frame and a lower adjustment frame; the two adjustment frames are rotatably connected to the intermediate shaft and are respectively disposed at both ends of the magnetostrictive material; the two adjustment frames are connected by a support column and are used to assist in fixing the magnetostrictive material. Preferably, a third through hole extending toward the intermediate shaft is provided on the end face of the adjustment frame away from the intermediate shaft, for inserting a detachable fastener to abut against the surface of the intermediate shaft, so as to restrict the rotation of the intermediate shaft relative to the adjustment frame. Preferably, the intermediate shaft includes a material fixing part and two positioning parts located at both ends of the material fixing part; the material fixing part is used to install and fix the magnetostrictive material; the fixing arm and the auxiliary adjustment component are disposed on the positioning part; the material fixing part and the two positioning parts form a detachable connection to facilitate the installation and removal of the magnetostrictive material.

7. A method for preparing a slit-type magnetostrictive material, characterized in that, Using the magnetostrictive material kerfing apparatus according to any one of claims 1-6, the preparation method comprises the following steps: (1) Hole the magnetostrictive material rod to be processed to form a central through hole along the central axis of the rod; (2) The magnetostrictive material rod with a central through hole is installed in the magnetostrictive material slit cutting device for slit cutting; the slit cutting process includes: installing the rod on the intermediate shaft and fixing it, fixing two fixed arms on the vertical plate on one side of the intermediate shaft, and cutting slits one by one on the side of the rod relative to the fixed arms; then, first disassembling one of the fixed arms, rotating it 180° around the intermediate shaft to the vertical plate on the other side of the intermediate shaft and fixing it, then disassembling the other fixed arm, rotating it to the vertical plate on the other side of the intermediate shaft and fixing it, and processing the side of the rod relative to the fixed arms; a number of slits extending along the axial direction of the rod are formed on the magnetostrictive material rod, and each slit is distributed along the circumference of the rod; (3) Inject glue into the magnetostrictive material rod after the slit cutting is completed; (4) The surface of the magnetostrictive material rod after glue injection is ground and straightened to obtain the slit magnetostrictive material.

8. The preparation method according to claim 7, characterized in that, The hole-cutting process described in step (1) is performed using a hole-cutting machine; Preferably, the cutting method in step (2) includes wire electrical discharge machining.

9. The preparation method according to claim 7 or 8, characterized in that, The process of injecting adhesive in step (3) includes: cleaning the magnetostrictive rod, blocking the central through hole, placing the adhesive agent at one end of the magnetostrictive rod, and forming a vacuum at the other end of the magnetostrictive rod to allow the adhesive agent to penetrate into the cut, and then curing it after completion; Preferably, the reagents used for injection in step (3) include: epoxy resin, acetone and defoamer.

10. The preparation method according to any one of claims 7-9, characterized in that, In step (4), a slit-type magnetostrictive material straightening and fixing device is used to straighten and fix the magnetostrictive material rod. The straightening and fixing device includes: A base, on which a V-shaped correction block, a baffle, and a guide assembly are provided; The V-shaped straightening block is fixedly installed on the base, and a plurality of sequentially arranged V-shaped grooves are formed on the surface of the V-shaped straightening block near the baffle. The baffle is movably disposed on the base, and a plurality of receiving spaces are formed between the baffle and the V-shaped straightening block. The receiving spaces are used to place magnetostrictive material rods. The guide assembly is connected to the baffle and is used to drive the baffle to move towards or away from the V-shaped straightening block to apply pressure to the material, thereby fixing and straightening the material in the receiving spaces. Preferably, the guide assembly includes a guide shaft and a handwheel, one end of the guide shaft is connected to the handwheel, and the other end abuts against the baffle.

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