Preparation method of a high-strength soft magnetic alloy bar

Abstract

The present invention discloses a preparation method of a high-strength soft magnetic alloy bar, and the present invention relates to the technical field of soft magnetic alloy bar processing. The preparation of the high-strength soft magnetic alloy bar is completed by the cooperation of a processing table, an arc-shaped placement plate, a top clamping mechanism, a pushing mechanism, a multi-stage gradually expanding drilling mechanism, a follow-up cooling mechanism, and a radial drilling mechanism. The upper end surface of the processing table is fixedly connected with the arc-shaped placement plate symmetrically left and right through columns. A radial drilling mechanism for radially drilling the bar is jointly arranged between the two pushing mechanisms and the processing table. By gradually expanding the hole through the multi-stage gradually expanding drilling mechanism, the risk of material brittle fracture caused by stress concentration due to excessive single drilling amount is avoided, the roughness and burrs of the inner wall of the hole are reduced, and the smoothness and precision of the hole wall are improved. The radial drilling mechanism enables the axial and radial drilling to be carried out simultaneously without additional adjustment. At the same time, the follow-up cooling mechanism ensures the synchronous delivery of the coolant, prevents heat accumulation and material deformation, and further improves the drilling precision and quality.

Description

Technical Field

[0001] The present invention relates to the technical field of soft magnetic alloy bar processing, and specifically to a preparation method for high-strength soft magnetic alloy bars. Background Art

[0002] High-strength soft magnetic alloy bars are a type of special metal material with high magnetic permeability, low coercivity, and low loss. They combine excellent magnetic properties and mechanical strength and are widely used in equipment and scenarios that require high magnetic permeability and can withstand large mechanical stresses, such as electromagnetic induction, transformers, motors, and electromagnetic shielding. These alloys are mainly composed of iron-nickel alloys, iron-silicon alloys, iron-cobalt alloys, etc. They are easily magnetized in a weak magnetic field and can quickly demagnetize after removing the external magnetic field, showing soft magnetism. The current preparation of soft magnetic alloy bars mainly includes steps such as raw material selection, melting, forging, stress relief heat treatment, drilling and opening holes, and magnetic heat treatment. Among them, opening holes inside the bar is the most critical step.

[0003] The high-strength soft magnetic alloy bars after drilling and opening holes have precise inner holes and good magnetic properties, so they are widely used in many industrial and high-tech fields. The following are some of the main application fields: The soft magnetic alloy bars after drilling are used as magnetic core components in motors and generators. Especially when used in high-efficiency and high-frequency motors, the inner hole design can be used to accommodate the shaft or other fixing elements to ensure the stability and magnetic conductivity of the magnetic circuit; when used as the core material of a transformer, the drilled bars are particularly suitable for the production of toroidal cores, and the inner hole can be used to install wires or other components; when used in sensors, since the sensors require precise magnetic field control, the inner hole of the bar allows other electronic components to be embedded in it, making it a highly sensitive induction component.

[0004] In the existing process, the entire hole diameter is usually drilled at one time. Since the single drilling amount is too large, it is easy to cause local stress concentration at the drilling site. Especially in the case where the soft magnetic alloy material is relatively fragile or there are microcracks on the surface, it is easy to induce cracking, reducing the structural integrity and strength of the hole, resulting in rough inner walls of the hole and poor smoothness of the hole wall, resulting in low dimensional accuracy of the final drilled hole and being unable to meet the high-precision application requirements, affecting the quality of the final bar.

[0005] Moreover, when the existing soft magnetic alloy bars need to be drilled radially after axial drilling, usually additional operating steps are required, making the entire drilling process more complex. Drilling in different directions requires different processing equipment and repositioning and clamping of the bars, increasing the operating steps.

[0006] In addition, when axially drilling a rod, as the drill goes deeper, the drilling area gradually becomes closed, and the coolant cannot enter the deep hole part where the drill bit contacts the rod in a timely and effective manner. The cooling effect will decrease rapidly, causing the temperature of this part to rise rapidly and generate heat accumulation. The accumulated heat causes the rod to soften locally during the drilling process, or produce phase changes, affecting the machinability, and causing the inner wall of the hole to become rough, with increased burrs and even surface burns, affecting the shape and dimensional accuracy of the hole. Summary of the invention

[0007] The present invention provides a method for preparing high-strength soft magnetic alloy rods, which solves the technical problem in the existing process that excessive single drilling amount may easily lead to local stress concentration in the soft magnetic alloy material, especially when the material is fragile or has microcracks, which may easily cause cracking, resulting in rough inner wall of the hole and low dimensional accuracy that cannot meet high-precision requirements. At the same time, radial drilling requires additional operating steps, which increases complexity and equipment requirements. In addition, as the drill bit goes deeper, it is difficult for the coolant to effectively enter the deep hole, and heat accumulation leads to local softening, which in turn causes the inner wall of the hole to be rough, burrs to increase, and even burns, affecting the accuracy and quality of the hole.

[0008] The present invention provides a method for preparing a high-strength soft magnetic alloy rod. The specific steps of the method for preparing the high-strength soft magnetic alloy rod are as follows:

[0009] S1. Raw material selection: First, you need to select the appropriate metal raw material based on the specific composition of the required alloy.

[0010] S2. Melting: After the selected metal raw materials are mixed in a certain proportion, they are melted in a vacuum induction furnace. Then, a suitable mold is selected and the molten alloy material is cooled to form an alloy ingot by controlling the cooling rate.

[0011] S3. Forging: Forge the alloy ingot into bars of different diameters according to actual needs.

[0012] S4. Stress relief heat treatment: The forged bars are subjected to stress relief treatment, solution treatment and annealing treatment to improve their mechanical properties.

[0013] S5. Drilling and hole-making: The rod is drilled internally by a multi-stage progressive expansion drilling mechanism, and then the surface is rust-removed and polished.

[0014] S6. Magnetic heat treatment: Perform magnetic heat treatment on the processed bars to ensure the magnetic properties.

[0015] S7. Quality inspection: Finally, the finished product is subjected to chemical composition analysis, mechanical property test and magnetic property test to ensure compliance with the standards.

[0016] The preparation method steps of the high-strength soft magnetic alloy bar in the above steps S1-S7 need to be completed in cooperation with a processing table, an arc-shaped placement plate, a top clamping mechanism, a pushing mechanism, a multi-stage gradually expanding drilling mechanism, a follow-up cooling mechanism, and a radial drilling mechanism.

[0017] On the upper end surface of the processing table, arc-shaped placement plates are fixedly connected symmetrically left and right through columns. Two top clamping mechanisms for automatically and quickly clamping and positioning the bar are symmetrically installed on the upper end surface of the processing table left and right. A pushing mechanism is jointly installed between the top clamping mechanism and the processing table. A multi-stage gradually expanding drilling mechanism for gradually opening the inner hole of the bar to improve the inner hole accuracy and the smoothness of the hole wall after processing is installed on the pushing mechanism. The pushing mechanism is used to respectively push the two top clamping mechanisms to move closer to each other to clamp and position the bar and push the two multi-stage gradually expanding drilling mechanisms to perform inner hole drilling on the bar. The multi-stage gradually expanding drilling mechanism includes a shaft rod rotatably arranged on the pushing mechanism, a conical drill bit fixedly connected to one end of the shaft rod close to the arc-shaped placement plate, several drill blades fixedly connected to the conical drill bit at equal circumferential intervals for performing primary drilling on the bar, a shaft sleeve slidably connected to the outside of the shaft rod, and an expanding drill assembly jointly arranged between the shaft sleeve and the shaft rod for performing secondary hole expanding drilling on the bar. A follow-up cooling mechanism for timely cooling the contact area between the multi-stage gradually expanding drilling mechanism and the bar during drilling is jointly arranged between the multi-stage gradually expanding drilling mechanism and the pushing mechanism. A radial drilling mechanism for radially drilling the bar is jointly arranged between the two pushing mechanisms and the processing table.

[0018] In a possible implementation manner, the expanding drill assembly includes a plurality of strip-shaped through grooves opened on the shaft sleeve at equal circumferential intervals and corresponding to the drill blades. An outer expanding blade is hinged in each strip-shaped through groove through a rotating column. A driving expansion member for driving the outer expanding blade to move outwards and expand so as to expand the inner hole of the bar is jointly installed between the shaft rod and the outer expanding blade.

[0019] In a possible implementation manner, the driving expansion member includes a plurality of installation grooves opened on the shaft rod at equal circumferential intervals. A sliding groove is opened on the outer expanding blade. A sliding column fixedly connected to the groove wall of the installation groove and slidably arranged in the sliding groove is provided.

[0020] In one possible implementation, the top clamping mechanism includes two sliding rods that are symmetrically fixed to the end surface of the processing table through a connecting plate and a sliding frame that is slidably connected to the outside of the two sliding rods through a lug. The side of the sliding frame away from the arc-shaped placement plate is slidably connected to a transverse movement frame through a spring telescopic column. The upper and lower opposite sides of the sliding frame are hinged with folding rods through connecting rods, and the end of the folding rod close to the arc-shaped placement plate is hinged with an arc-shaped clamping plate. The arc-shaped surface walls of the two arc-shaped clamping plates close to each other are fixedly connected with resistance blocks. A waist-shaped groove is provided on the folding rod, and the upper and lower opposite sides of the sliding frame are fixedly connected with shifting columns slidably set in the waist-shaped groove through connecting strips.

[0021] In a possible implementation, the pushing mechanism includes two rectangular frames symmetrically fixedly connected up and down on the side of the transverse frame away from the sliding frame, a slider is slidably connected in the rectangular frame, a return spring is fixedly connected between the slider and the rectangular frame, a push plate is fixedly connected between the two sliders, the shaft rod is rotatably connected to the push plate, a fixed plate is fixedly connected to the upper end surface of the processing table, and a No. 1 electric telescopic rod is fixedly connected between the fixed plate and the push plate.

[0022] In a possible implementation, the follow-up cooling mechanism includes a transverse hole groove jointly opened in the shaft rod and the conical drill bit along the axial direction of the shaft rod, and a plurality of outflow grooves connected to the transverse hole groove are circumferentially equidistantly opened on the conical drill bit and the shaft rod respectively, and a spiral paddle is fixedly connected to the transverse hole groove through a cross bar, and a liquid storage box rotatably sleeved on the outside of the shaft rod is fixedly connected to the side of the push plate close to the sleeve, and a plurality of connecting grooves connected to the liquid storage box and the transverse hole groove are circumferentially equidistantly opened in the inner cavity section of the shaft rod located in the liquid storage box.

[0023] In a possible implementation, opposite sides of the two rectangular frames are fixedly connected with spring telescopic push rods, and one end of the spring telescopic push rod close to the shaft sleeve is fixedly connected with an arc plate that abuts against the outside of the shaft sleeve.

[0024] In one possible implementation, the radial drilling mechanism includes a mounting plate fixedly connected to the end surface of the processing table by a support rod, the front end surface of the mounting plate is symmetrically slidably connected to a sliding block by a sliding groove, the front end surface of the sliding block is fixedly connected to a mounting block, a drill rod is slidably connected to the mounting block, a return spring is fixedly connected to the upper end surface of the mounting block, a connecting ring is connected between the upper end of the return spring and the drill rod for common rotation, the front end surface of the mounting plate is fixedly connected to a No. 2 electric telescopic rod by a connecting block, the lower end of the No. 2 electric telescopic rod is fixedly connected to a pressing plate, a locking assembly for locking and stopping the mounting block is jointly provided between the pressing plate and the mounting block, and a co-movement assembly for pulling the mounting block to move synchronously is jointly provided between the pushing mechanism and the mounting block.

[0025] In one possible implementation, the locking assembly includes a strip plate slidably connected to the lower end surface of the pressure plate through a spring telescopic rod, a plurality of positioning protrusions equidistantly fixedly connected to the lower end surface of the strip plate, and a plurality of positioning grooves equidistantly opened on the upper end surface of the mounting block for cooperating with the positioning protrusions.

[0026] In one possible implementation, the co-movement assembly includes an L-shaped rod fixedly connected to the upper end surface of the slider, a pull frame fixedly connected to one end of the L-shaped rod close to the mounting plate and slidably mounted on the outside of the mounting block, and a limit spring fixedly connected between the mounting block and the pull frame.

[0027] It can be seen from the above technical solutions that the present invention has the following advantages:

[0028] In the present invention, a multi-stage progressive expansion drilling mechanism is used to perform primary drilling and secondary expansion of the rod material in a step-by-step expansion manner, thereby avoiding the local stress concentration phenomenon caused by excessive single drilling amount, reducing the risk of material brittle fracture or microcrack extension, and the gradually expanding drilling method reduces processing stress, significantly reduces the roughness of the inner wall of the hole, improves the smoothness of the hole wall, reduces the generation of burrs and surface defects, ensures the accuracy of each processing, helps to better control the final size of the hole, and meets the needs of high-precision applications, thereby improving the accuracy of drilling and the quality of the rod after drilling.

[0029] In the present invention, through the cooperation of the radial drilling mechanism and the multi-stage progressive expansion drilling mechanism, the rod can be radially drilled according to needs while the axial secondary expansion drilling is performed on the rod. There is no need for additional clamping, adjustment or repositioning of the rod, and axial and radial drilling can be completed at one time, which greatly shortens the overall processing time. In addition, since radial and axial drilling are performed under the same positioning conditions, the positioning error that may be caused by re-clamping is reduced, thereby ensuring the hole position accuracy.

[0030] In the present invention, the transverse hole grooves, spiral paddles and outflow grooves in the follow-up cooling mechanism are combined with each other, so that the drilling coolant can flow synchronously with the drilling movement of the drill blade and the expansion blade, so that the drilling coolant can be accurately delivered to the drilling position in real time, ensuring that the temperature is effectively controlled during the entire drilling process to avoid the generation of heat accumulation. Effective cooling prevents local softening, reduces the risk of roughness, burrs or burns on the inner wall of the hole, maintains the quality of the hole wall, and avoids material deformation caused by heat accumulation, ensuring that the shape and size accuracy of the hole meet the requirements, thereby improving the drilling accuracy.

[0031] In the present invention, through the combination of the top clamping mechanism and the multi-stage progressive expansion drilling mechanism, the rod can be automatically clamped, positioned and drilled in sequence, that is, the automatic clamping and positioning operation can be combined with the clamping and drilling operations, reducing independent and separate operation links, simplifying the processing flow, and thus shortening the overall drilling processing cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0033] Figure 1 It is a diagram of the preparation method of the high-strength soft magnetic alloy bar provided by the present invention.

[0034] Figure 2 It is a schematic diagram of the overall structure provided by the present invention.

[0035] Figure 3 It is a schematic diagram of the rear view perspective of the overall structure provided by the present invention.

[0036] Figure 4 Provided by the present invention Figure 3 Schematic diagram of the enlarged structure of part A in

[0037] Figure 5 It is a schematic diagram of the connection structure of the top clamping mechanism, the pushing mechanism and the multi-stage gradually expanding drilling mechanism provided by the present invention.

[0038] Figure 6 It is a schematic diagram of the partial sectional view of the follow-up type cooling mechanism provided by the present invention.

[0039] Figure 7 It is a schematic diagram of the front view perspective sectional structure of the multi-stage gradually expanding drilling mechanism provided by the present invention.

[0040] Figure 8 Provided by the present invention Figure 7 Schematic diagram of the enlarged structure of part B in

[0041] Figure 9 It is a schematic diagram of the structure of the radial drilling mechanism provided by the present invention.

[0042] Figure 10 Provided by the present invention Figure 9 Schematic diagram of the enlarged structure of part C in

[0043] Figure 11 It is a schematic diagram of the partial bottom view perspective of the radial drilling mechanism provided by the present invention.

[0044] Among them, the above-mentioned drawings include the following reference numerals:

[0045] 1. Processing table; 2. Arc-shaped placement plate; 3. Top clamping mechanism; 31. Slide bar; 32. Slide frame; 33. Transverse movement frame; 34. Folded rod; 35. Arc-shaped clamping plate; 36. Contact block; 37. Waist-shaped groove; 38. Pushing column; 4. Pushing mechanism; 41. Rectangular frame; 42. Slide block; 43. Return spring; 44. Pushing plate; 45. First electric telescopic rod; 5. Multi-stage gradually expanding drilling mechanism; 51. Shaft rod; 52. Conical drill bit; 53. Drill blade; 54. Bush; 55. Expanding drill assembly; 551. Strip-shaped through groove; 552. Outer expanding blade; 553. Driving expansion part; 5531. Installation groove; 5532. Slide groove; 5533. Slide column; 6. Follow-up cooling mechanism; 61. Transverse hole groove; 62. Outflow groove; 63. Spiral deflector; 64. Liquid storage box; 65. Connecting groove; 7. Radial drilling mechanism; 71. Installation plate; 72. Sliding block; 73. Installation block; 74. Drill rod; 75. Return spring; 76. Second electric telescopic rod; 77. Pressing plate; 78. Locking stop assembly; 781. Strip-shaped plate; 782. Positioning convex block; 783. Positioning groove; 79. Co-moving assembly; 791. L-shaped rod; 792. Pulling frame; 793. Limiting spring; 8. Spring telescopic ejector rod; 9. Arc-shaped plate. Detailed implementation manners

[0046] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0047] Please refer to Figure 1 , Figure 2 and Figure 3 , the present invention provides a technical solution: a preparation method of a high-strength soft magnetic alloy rod, and the specific steps of the preparation method of the high-strength soft magnetic alloy rod are as follows:

[0048] S1. Raw material selection: First, it is necessary to select appropriate metal raw materials according to the specific composition of the required alloy.

[0049] S2. Melting: After mixing the selected metal raw materials in a certain proportion, melt them in a vacuum induction furnace, and then select a suitable mold and cool the molten alloy material by controlling the cooling rate to form an alloy ingot.

[0050] S3. Forging: According to actual needs, forge the alloy ingot into rods with different diameters.

[0051] S4. Stress relief heat treatment: The forged bars are subjected to stress relief treatment, solution treatment and annealing treatment to improve their mechanical properties.

[0052] S5, drilling and opening holes: the rod material is subjected to internal hole drilling processing by means of the multi-stage progressive expansion drilling mechanism 5, and then the surface is subjected to rust removal and polishing treatment.

[0053] S6. Magnetic heat treatment: Perform magnetic heat treatment on the processed bars to ensure the magnetic properties.

[0054] S7. Quality inspection: Finally, the finished product is subjected to chemical composition analysis, mechanical property test and magnetic property test to ensure compliance with the standards.

[0055] The preparation method steps of the high-strength soft magnetic alloy rods in the above steps S1-S7 need to be completed by the processing table 1, the arc-shaped placement plate 2, the top clamping mechanism 3, the pushing mechanism 4, the multi-stage gradual expansion drilling mechanism 5, the follow-up cooling mechanism 6 and the radial drilling mechanism 7.

[0056] An arc-shaped placement plate 2 is symmetrically fixedly connected to the upper end surface of the processing table 1 through a pillar. Two top clamping mechanisms 3 for automatically and quickly clamping and positioning the rods are symmetrically installed on the upper end surface of the processing table 1. A pushing mechanism 4 is installed between the top clamping mechanism 3 and the processing table 1. A multi-stage gradual expansion drilling mechanism 5 for progressively opening holes in the rods to improve the accuracy of the inner holes and the smoothness of the hole walls of the rods after processing is installed on the pushing mechanism 4. The pushing mechanism 4 is used to push the two top clamping mechanisms 3 to move closer to each other to position and clamp the rods and push the two multi-stage gradual expansion drilling mechanisms 5 to drill inner holes in the rods. A follow-up cooling mechanism 6 for timely cooling the contact point between the multi-stage gradual expansion drilling mechanism 5 and the rods during the drilling process is commonly arranged between the multi-stage gradual expansion drilling mechanism 5 and the pushing mechanism 4. A radial drilling mechanism 7 for radially drilling holes in the rods is commonly arranged between the two pushing mechanisms 4 and the processing table 1.

[0057] See also Figure 3 , Figure 4 and Figure 5 In this embodiment, the top clamping mechanism 3 includes two slide bars 31 symmetrically fixedly connected to the upper end surface of the processing table 1 through a connecting plate and a slide frame 32 slidably connected to the outside of the two slide bars 31 through a lug. The side of the slide frame 32 away from the arc-shaped placement plate 2 is slidably connected to a transverse frame 33 through a spring telescopic column. The upper and lower opposite sides of the slide frame 32 are hinged with a folding rod 34 through a connecting rod. The end of the folding rod 34 close to the arc-shaped placement plate 2 is hinged with an arc-shaped clamping plate 35. The arc-shaped surface walls of the two arc-shaped clamping plates 35 close to each other are fixedly connected with a resistance block 36. A waist-shaped groove 37 is opened on the folding rod 34. The upper and lower opposite sides of the slide frame 32 are fixedly connected with a shifting column 38 slidably set in the waist-shaped groove 37 through a connecting strip.

[0058] Please refer to Figure 3 and Figure 5 As shown in Figure 5 , the pushing mechanism 4 includes two rectangular frames 41 symmetrically and fixedly connected to the side of the transverse movement frame 33 away from the sliding frame 32 in the up and down directions. A slider 42 is slidably connected in the rectangular frame 41. A return spring 43 is fixedly connected between the slider 42 and the rectangular frame 41. A push plate 44 is fixedly connected between the two sliders 42. A shaft rod 51 is rotatably connected to the push plate 44. A fixed plate is fixedly connected to the upper end surface of the processing table 1. A first electric telescopic rod 45 is fixedly connected between the fixed plate and the push plate 44.

[0059] Place the bar to be drilled on the arc-shaped placement plate 2, and then control the operation of the pushing mechanism 4: By energizing the first electric telescopic rod 45 to extend, it drives the push plate 44 to move closer to the transverse movement frame 33. Then, the push plate 44 pushes the transverse movement frame 33 to move through the slider 42, the return spring 43 and the rectangular frame 41. The transverse movement frame 33 then pushes the sliding frame 32 to move. The two sliding frames 32 move closer to the arc-shaped placement plate 2. The sliding frame 32 then drives the folding rod 34 to move through the connecting rod. The folding rod 34 then drives the arc-shaped clamping plate 35 to move until the arc-shaped clamping plate 35 drives the abutting block 36 to abut against the end of the bar. At this time, the sliding frame 32 stops moving. The first electric telescopic rod 45 continues to extend and pushes the transverse movement frame 33 to continue moving. The transverse movement frame 33 moves and pushes the spring telescopic column to be gradually compressed and drives the dialing column 38 to move through the connecting bar. The movement of the dialing column 38 further squeezes the waist-shaped groove 37 and then pushes the folding rod 34 to rotate around its hinge joint with the connecting rod. The folding rod 34 then drives the arc-shaped clamping plate 35 to rotate around the abutting block 36 until the arc-shaped clamping plate 35 completely clamps the outside of the bar, so that the rapid clamping and positioning of the bar can be completed. Then, the first electric telescopic rod 45 continues to extend and drives the push plate 44 to continue moving. The push plate 44 then pushes the multi-stage gradually expanding drilling mechanism 5 to operate to perform hole drilling on the clamped bar. At this time, the movement of the push plate 44 drives the slider 42 to slide in the rectangular frame 41, pushing the return spring 43 to contract.

[0060] Please refer to Figure 3 、 Figure 4 、 Figure 5 、 Figure 7 and Figure 8, in this embodiment, the multi-stage gradually expanding drilling mechanism 5 includes a shaft rod 51 rotatably arranged on the pushing mechanism 4, a conical drill bit 52 fixedly connected to one end of the shaft rod 51 close to the arc-shaped placing plate 2, several drill blades 53 fixedly connected to the conical drill bit 52 at equal circumferential intervals for performing primary drilling on the bar, a sleeve 54 slidably connected to the outside of the shaft rod 51, and an expanding drill assembly 55 jointly arranged between the sleeve 54 and the shaft rod 51 for performing secondary reaming on the bar. Spring telescopic ejector rods 8 are fixedly connected to opposite sides of the two rectangular frames 41. One end of the spring telescopic ejector rod 8 close to the sleeve 54 is fixedly connected with an arc-shaped plate 9 abutting against the outside of the sleeve 54. The expanding drill assembly 55 includes several strip-shaped through grooves 551 circumferentially and equidistantly arranged on the sleeve 54 and corresponding to the drill blades 53. An outer expanding blade 552 is hinged in each strip-shaped through groove 551 through a rotating column. A driving and expanding member 553 for driving the outer expanding blade 552 to move outwards and expand so as to ream the inner hole of the bar is jointly installed between the shaft rod 51 and the outer expanding blade 552. The driving and expanding member 553 includes several mounting grooves 5531 circumferentially and equidistantly arranged on the shaft rod 51. A sliding groove 5532 is formed on the outer expanding blade 552. A sliding column 5533 fixedly connected to the groove wall of the mounting groove 5531 is slidably arranged in the sliding groove 5532.

[0061] When the push plate 44 drives the slider 42 to slide in the rectangular frame 41, it will drive the shaft rod 51 to move. Then the shaft rod 51 drives the conical drill bit 52 to move closer to the bar. When the conical drill bit 52 abuts against the end of the bar, then the shaft rod 51 is driven to rotate by an external driving device 1. The shaft rod 51 then drives the conical drill bit 52 to rotate. The two conical drill bits 52 move closer to each other. During the movement from the end of the bar to the middle, primary drilling is performed on the bar. It is decided whether to drill through the middle of the bar according to requirements. Then the first electric telescopic rod 45 is controlled to contract to drive the push plate 44 to move away from the bar. The push plate 44 then drives the shaft rod 51 to move, and the shaft rod 51 then drives the sleeve 54 to move.

[0062] During the horizontal movement of the bushing 54, the spring telescopic ejector rod 8 is used to push the arc-shaped plate 9 to contact the bushing 54. When the bushing 54 moves horizontally, it needs to overcome the frictional resistance between the arc-shaped plate 9 and it. Therefore, when the shaft rod 51 moves away from the bar, it will move out of position with the shaft rod 51 by a certain distance. During this process, the shaft rod 51 drives the sliding column 5533 to move. Then, the sliding column 5533 pulls the outward-expanding blade 552 to rotate around the rotating column through the sliding groove 5532, so that the outward-expanding blade 552 changes from the initial state of being retracted into the strip-shaped through groove 551 to the state of expanding outward. The expanded outward-expanding blade 552 is larger than the diameter of the bushing 54, so that the hole drilled by the conical drill bit 52 and the drill blade 53 can be further enlarged by drilling, that is, secondary drilling treatment can be carried out, and the bar can be drilled from thin to thick, reducing the single drilling amount during drilling, avoiding the situation that a large drilling amount is likely to cause local stress concentration at the drilling part, and improving the accuracy of the drilling size.

[0063] Please refer to Figure 3 and Figure 9 In this embodiment, the radial drilling mechanism 7 includes a mounting plate 71 fixedly connected to the upper end surface of the processing table 1 through a support rod. The front end surface of the mounting plate 71 is symmetrically slidably connected with sliding blocks 72 through sliding grooves on the left and right. The front end surface of the sliding block 72 is fixedly connected with a mounting block 73. A drill rod 74 is slidably connected to the mounting block 73. A return spring 75 is fixedly connected to the upper end surface of the mounting block 73. A connecting ring is rotatably connected between the upper end of the return spring 75 and the drill rod 74. The front end surface of the mounting plate 71 is fixedly connected with a second electric telescopic rod 76 through a connecting block. The lower end of the second electric telescopic rod 76 is fixedly connected with a pressing plate 77. A locking and stopping assembly 78 for locking and stopping the mounting block 73 is provided between the pressing plate 77 and the mounting block 73. A synchronous moving assembly 79 for pulling the mounting block 73 to move synchronously is provided between the pushing mechanism 4 and the mounting block 73.

[0064] Please refer to Figure 5 、 Figure 9 、 Figure 10 and Figure 11 The locking and stopping assembly 78 includes a strip-shaped plate 781 slidably connected to the lower end surface of the pressing plate 77 through a spring telescopic rod, a plurality of positioning convex blocks 782 fixedly connected to the lower end surface of the strip-shaped plate 781 at equal intervals, and a plurality of positioning grooves 783 opened on the upper end surface of the mounting block 73 at equal intervals for cooperating with the positioning convex blocks 782. The synchronous moving assembly 79 includes an L-shaped rod 791 fixedly connected to the upper end surface of the slider 42, a pulling frame 792 fixedly connected to one end of the L-shaped rod 791 close to the mounting plate 71 and slidably sleeved outside the mounting block 73, and a limiting spring 793 fixedly connected between the mounting block 73 and the pulling frame 792.

[0065] During the secondary drilling process of the bar in the axial direction, two sliders 42 that are far away from each other in the transverse direction will also drive the pulling frame 792 to move through the L-shaped rod 791 at the same time. Then, the pulling frame 792 will drive the mounting block 73 to move through the limiting spring 793. The mounting block 73 will further drive the sliding block 72 to slide in the sliding groove. The mounting block 73 will also drive the drill rod 74 to move. When the drill rod 74 moves to the position where radial drilling is required, control the second electric telescopic rod 76 to extend and push the pressing plate 77 to move downward. Then, the pressing plate 77 will drive the strip plate 781 to move downward through the spring telescopic rod. The strip plate 781 will then drive the positioning convex block 782 to move downward and snap into the positioning groove 783 to lock the mounting block 73 and stop it.

[0066] At this time, the moving pulling frame 792 will move relative to the mounting block 73 in a staggered manner and drive the limiting spring 793 to deform. Then, the pressing plate 77 will contact the drill rod 74 and push it to move downward. At the same time, drive the drill rod 74 to rotate through the external driving device two. When the drill rod 74 moves downward and contacts the bar, radial drilling of the bar can be carried out. During the drilling process, the shaft rod 51 and the shaft sleeve 54 of the axial drilling maintain normal lateral movement, so that radial drilling of the bar can be carried out without additional operations. After the radial drilling is completed, control the second electric telescopic rod 76 to contract and drive the pressing plate 77 to move upward. During the upward movement of the pressing plate 77, the return spring 75 in the reset state drives the second drill rod 74 to move upward until the second drill rod 74 moves to the initial position. Then, the pressing plate 77 continues to move upward for a certain distance and drives the strip plate 781 to move upward through the spring telescopic rod. The strip plate 781 drives the positioning convex block 782 to move out of the positioning groove 783, and then drives the mounting block 73 to move horizontally synchronously with the slider 42.

[0067] Please refer to Figure 5 、 Figure 6 、 Figure 7 and Figure 8 In this embodiment, the follow-up cooling mechanism 6 includes a transverse hole groove 61 that is axially opened in the shaft rod 51 and the conical drill bit 52 along the axial direction of the shaft rod 51. A plurality of outflow grooves 62 that are circumferentially equidistant and communicate with the transverse hole groove 61 are respectively opened on the conical drill bit 52 and the shaft rod 51. A spiral blade 63 is fixedly connected in the transverse hole groove 61 through a cross bar. A liquid storage box 64 that is rotatably sleeved outside the shaft rod 51 is fixedly connected to one side of the push plate 44 close to the shaft sleeve 54. A plurality of communication grooves 65 that communicate with the liquid storage box 64 and the transverse hole groove 61 are circumferentially equidistant on the inner cavity section of the shaft rod 51 where it is located in the liquid storage box 64. The outflow groove 62 on the drill rod 74 communicates with the mounting groove 5531.

[0068] Before drilling, the drilling coolant is first input into the liquid storage box 64. When the shaft 51 rotates to drill the rod, it also drives the spiral paddle 63 to rotate through the cross bar. When the shaft 51 rotates, the bottom end of the connecting groove 65 is intermittently connected with the liquid storage box 64. When the connecting groove 65 is connected with the liquid storage box 64, the drilling coolant enters the transverse hole groove 61 through the connecting groove 65. Then, under the action of the spiral paddle 63 in the rotating state, the drilling coolant flows toward the conical drill bit 52. When the drilling coolant flows along the transverse hole groove 61 located at the conical drill bit 52, the drilling coolant flows to the conical drill bit 52. When the drill bit 52 is in the hole section, it will be thrown outward into the outflow groove 62 under the action of the centrifugal force of the rotation of the shaft 51 and the conical drill bit 52. The drilling coolant flowing out of the outflow groove 62 on the shaft 51 will enter the mounting groove 5531, and then thrown out by centrifugal force. The drilling coolant is thrown to the contact point between the drill blade 53 and the hole wall and the contact point between the outward expansion blade 552 and the hole wall, so that the drilled part of the rod can be cooled in time, avoiding heat accumulation caused by excessive drilling depth and ensuring the accuracy of the hole after drilling.

[0069] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0070] In addition, the terms "first", "second", "number one", "number two" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "number one", "number two" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0071] In the present invention, unless otherwise clearly specified or limited, the terms "installed", "connected", "coupled", "fixed", etc. shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] The embodiments of the specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A method for preparing a high-strength soft magnetic alloy rod, characterized in that: The specific steps of the preparation method of high-strength soft magnetic alloy rods are as follows: S1. Raw material selection: First, you need to select the appropriate metal raw materials according to the specific composition of the required alloy; S2. Melting: After the selected metal raw materials are mixed in a certain proportion, they are melted in a vacuum induction furnace, and then a suitable mold is selected and the molten alloy material is cooled to form an alloy ingot by controlling the cooling rate; S3, Forging: Forging the alloy ingot into bars of different diameters according to actual needs; S4. Stress relief heat treatment: Stress relief treatment, solution treatment and annealing treatment are performed on the forged bars to improve their mechanical properties; S5, drilling and opening holes: drilling and opening holes in the rod material by means of a multi-stage progressively expanding drilling mechanism (5), and then removing rust and polishing the surface; S6. Magnetic heat treatment: Perform magnetic heat treatment on the processed bars to ensure the magnetic properties; S7, Quality Inspection: Finally, the finished product is subjected to chemical composition analysis, mechanical property test and magnetic property test to ensure compliance with the standards; The steps of the method for preparing the high-strength soft magnetic alloy rod in the above steps S1 to S7 need to be completed by the cooperation of a processing table (1), an arc-shaped placement plate (2), a top clamping mechanism (3), a pushing mechanism (4), a multi-stage gradual expansion drilling mechanism (5), a follow-up cooling mechanism (6) and a radial drilling mechanism (7); wherein: The upper end surface of the processing table (1) is symmetrically fixedly connected to an arc-shaped placement plate (2) through a support, and the upper end surface of the processing table (1) is symmetrically installed with two top clamping mechanisms (3) for automatically and quickly clamping and positioning the rod, and a push mechanism (4) is installed between the top clamping mechanism (3) and the processing table (1), and a multi-stage gradual expansion drilling mechanism (5) is installed on the push mechanism (4) for progressively opening a hole in the rod to improve the accuracy of the inner hole of the rod after processing and the smoothness of the hole wall, and the push mechanism (4) is used to push the two top clamping mechanisms (3) to move closer to each other to position and clamp the rod, and to push the two multi-stage gradual expansion drilling mechanisms (5) to drill the inner hole of the rod; The multi-stage gradually expanding drilling mechanism (5) comprises: A shaft (51) rotatably arranged on the pushing mechanism (4), a conical drill bit (52) fixedly connected to one end of the shaft (51) close to the arc-shaped placement plate (2), a plurality of drill blades (53) equidistantly fixedly connected to the conical drill bit (52) in the circumferential direction for performing primary drilling on the rod, a sleeve (54) slidably connected to the outside of the shaft (51), and an expansion drilling assembly (55) jointly arranged between the sleeve (54) and the shaft (51) for performing secondary expansion drilling on the rod; A follow-up cooling mechanism (6) is provided between the multi-stage gradually expanding drilling mechanism (5) and the pushing mechanism (4) for timely cooling the contact point between the multi-stage gradually expanding drilling mechanism (5) and the rod during the drilling process, and a radial drilling mechanism (7) is provided between the two pushing mechanisms (4) and the processing table (1) for radially drilling holes in the rod.

2. The method for preparing a high-strength soft magnetic alloy rod according to claim 1, characterized in that: The expansion drill assembly (55) comprises a plurality of strip-shaped through grooves (551) which are equidistantly arranged on the shaft sleeve (54) in the circumferential direction and correspond to the drill blades (53); an expansion blade (552) is hingedly connected to each of the strip-shaped through grooves (551) via a rotating column; and an expansion driving member (553) is installed between the shaft rod (51) and the expansion blades (552) for driving the expansion blades (552) to move outward to expand so as to expand the inner hole of the rod.

3. The method for preparing a high-strength soft magnetic alloy rod according to claim 2, characterized in that: The expansion member (553) includes a plurality of mounting grooves (5531) equidistantly arranged on the shaft rod (51) in the circumferential direction, a slide groove (5532) is arranged on the expansion blade (552), and a slide column (5533) slidably arranged in the slide groove (5532) is fixedly connected to the groove wall of the mounting groove (5531).

4. The method for preparing a high-strength soft magnetic alloy rod according to claim 1, characterized in that: The top clamping mechanism (3) comprises two slide bars (31) symmetrically fixedly connected to the upper end surface of the processing table (1) through a connecting plate and a slide frame (32) slidably connected to the outside of the two slide bars (31) through a lug. The side of the slide frame (32) away from the arc-shaped placement plate (2) is slidably connected to a transverse frame (33) through a spring telescopic column. The upper and lower opposite sides of the slide frame (32) are hinged with a folding rod (34) through a connecting rod. The end of the folding rod (34) close to the arc-shaped placement plate (2) is hinged with an arc-shaped clamping plate (35). The arc-shaped surface walls of the two arc-shaped clamping plates (35) close to each other are fixedly connected with a resistance block (36). The folding rod (34) is provided with a waist-shaped groove (37). The upper and lower opposite sides of the slide frame (32) are fixedly connected with a shifting column (38) slidably set in the waist-shaped groove (37) through a connecting strip.

5. The method for preparing a high-strength soft magnetic alloy rod according to claim 4, characterized in that: The pushing mechanism (4) comprises two rectangular frames (41) symmetrically fixedly connected to the side of the transverse frame (33) away from the sliding frame (32) in the upper and lower directions; a slider (42) is slidably connected in the rectangular frame (41); a return spring (43) is fixedly connected between the slider (42) and the rectangular frame (41); a push plate (44) is fixedly connected between the two sliders (42); the shaft (51) is rotatably connected to the push plate (44); a fixed plate is fixedly connected to the upper end surface of the processing table (1); and a No. 1 electric telescopic rod (45) is fixedly connected between the fixed plate and the push plate (44).

6. The method for preparing a high-strength soft magnetic alloy rod according to claim 5, characterized in that: The follow-up cooling mechanism (6) comprises a transverse hole groove (61) which is jointly opened in the shaft rod (51) and the conical drill bit (52) along the axial direction of the shaft rod (51); a plurality of outflow grooves (62) which are connected to the transverse hole groove (61) are opened equidistantly on the conical drill bit (52) and the shaft rod (51) respectively; a spiral paddle (63) is fixedly connected to the transverse hole groove (61) through a cross bar; a liquid storage box (64) which is rotatably sleeved on the outside of the shaft rod (51) is fixedly connected to the side of the push plate (44) close to the shaft sleeve (54); a plurality of connecting grooves (65) which are connected to the liquid storage box (64) and the transverse hole groove (61) are opened equidistantly on the shaft rod (51) in the inner cavity section of the liquid storage box (64) in the circumference.

7. The method for preparing a high-strength soft magnetic alloy rod according to claim 5, characterized in that: The two opposite sides of the two rectangular frames (41) are fixedly connected with spring telescopic push rods (8), and one end of the spring telescopic push rod (8) close to the shaft sleeve (54) is fixedly connected with an arc plate (9) that abuts against the outside of the shaft sleeve (54).

8. The method for preparing a high-strength soft magnetic alloy rod according to claim 5, characterized in that: The radial drilling mechanism (7) comprises a mounting plate (71) fixedly connected to the upper end surface of the processing table (1) through a support rod, the front end surface of the mounting plate (71) is symmetrically slidably connected to a sliding block (72) through a sliding groove, the front end surface of the sliding block (72) is fixedly connected to a mounting block (73), a drill rod (74) is slidably connected to the mounting block (73), the upper end surface of the mounting block (73) is fixedly connected to a return spring (75), and a return spring (75) is provided between the upper end of the return spring (75) and the drill rod (74). A connecting ring is rotatably connected thereto; the front end surface of the mounting plate (71) is fixedly connected to a No. 2 electric telescopic rod (76) via a connecting block; the lower end of the No. 2 electric telescopic rod (76) is fixedly connected to a pressing plate (77); a locking assembly (78) for locking and stopping the mounting block (73) is provided between the pressing plate (77) and the mounting block (73); and a synchronous moving assembly (79) for pulling the mounting block (73) to move synchronously is provided between the pushing mechanism (4) and the mounting block (73).

9. The method for preparing a high-strength soft magnetic alloy rod according to claim 8, characterized in that: The locking assembly (78) comprises a strip plate (781) slidably connected to the lower end surface of the pressure plate (77) via a spring telescopic rod, a plurality of positioning protrusions (782) equidistantly fixedly connected to the lower end surface of the strip plate (781), and a plurality of positioning grooves (783) equidistantly provided on the upper end surface of the mounting block (73) for cooperating with the positioning protrusions (782).

10. The method for preparing a high-strength soft magnetic alloy rod according to claim 8, characterized in that: The co-movement assembly (79) comprises an L-shaped rod (791) fixedly connected to the upper end surface of the slider (42), a pull frame (792) fixedly connected to one end of the L-shaped rod (791) close to the mounting plate (71) and slidably sleeved on the outside of the mounting block (73), and a limit spring (793) fixedly connected between the mounting block (73) and the pull frame (792).

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