Magnetofluid vibration reduction milling cutter capable of being injected with cooling medium

Abstract

The utility model provides a magnetofluid vibration-damping milling cutter capable of being injected with a cooling medium, which is characterized in that the outer side surface of a long magnetic conductive steel cylinder is matched with the inner hole surface of a vibration-damping magnetic conductive rod, and the inner hole surface of the long magnetic conductive steel cylinder is matched with the outer side surface of the vibration-damping magnetic conductive rod; the coil framework wound with the coil is embedded into the long magnetic conductive steel cylinder; the inner hole face of the coil framework is matched with the outer side face of the vibration reduction magnetic conduction rod. The short magnetic conductive sleeve is embedded into the long magnetic conductive steel cylinder; the inner hole surface of the short magnetic conductive sleeve is matched with the outer side surface of the vibration reduction magnetic conductive rod; the vibration reduction magnetic conductive rod is positioned in holes of the cutter bar, the long magnetic conductive sleeve, the coil framework and the short magnetic conductive sleeve; a magnetic fluid injection hole is formed in the side wall where the short magnetic conductive sleeve is located, and the magnetic fluid injection hole penetrates through the long magnetic conductive sleeve and the sleeve wall of the cutter bar. The method has the advantage that the problems of vibration and large heat productivity in the cutting process are effectively solved.

Description

Technical Field

[0001] This utility model relates to a magnetohydrodynamic vibration damping milling cutter that can be injected with a cooling medium. Background Technology

[0002] Tool vibration is a common problem in metal processing. This vibration negatively impacts both metal cutting and the machine tool itself. It disrupts the normal cutting process, shortens the lifespan of machine tools and cutting tools, causes chatter marks on machined surfaces, severely reduces the machining accuracy and surface quality of the workpiece, and generates harsh noise, making the operator's working environment more difficult. Vibration during cutting is a complex and common phenomenon. Although many researchers have conducted extensive studies on the mechanism of vibration generation, the exact cause remains unclear. As machining processes become increasingly sophisticated and advanced, preventing and minimizing the impact of vibration during cutting has become an urgent problem to solve. A milling cutter is a rotating cutting tool used for milling, with one or more teeth that intermittently remove excess material from the workpiece during operation. When selecting a milling cutter, the smallest length-to-diameter ratio (L / D ratio) tool that meets the machining requirements should be chosen to achieve the highest machining efficiency. Deep-cavity parts are widely used in the aerospace, automotive, and other industries. When machining the inner surfaces of deep-cavity parts, a large L / D ratio milling cutter is required. However, tools with a large length-to-diameter ratio have a longer overhang and poorer rigidity, making them prone to chattering during cutting. Chattering can cause vibration marks on the machined surface of the part, reducing its surface roughness. Utility Model Content

[0003] This invention provides a magnetohydrodynamic vibration-damping milling cutter that can be injected with a cooling medium, which effectively suppresses the problems of vibration and high heat generation during the cutting process, thus overcoming the shortcomings of the prior art.

[0004] This invention provides a magnetohydrodynamic (MHD) vibration-damping milling cutter capable of being injected with a cooling medium, comprising a cutting tooth 1, a cutter shank 2, and a radial vibration damping assembly; the cutting tooth 1 is fixed to one end of the cutter shank 2; the radial vibration damping assembly comprises: a short magnetic sleeve 3, a long magnetic sleeve 4, a coil 5, a coil frame 6, and a vibration-damping magnetic rod 12; the outer diameter of the long magnetic sleeve 4 matches the aperture of the vibration-damping magnetic rod 12, and the center aperture of the long magnetic sleeve 4 matches the vibration-damping magnetic rod 12; the coil 5 is wound on the coil frame 6; the coil frame 6 with the coil 5 wound on it is embedded in the long magnetic sleeve 4; the center aperture of the coil frame 6 matches the vibration-damping magnetic rod 12; the short magnetic sleeve 3 is embedded in the long magnetic sleeve 4. Inside, and pressed on the coil frame 6; the central hole of the short magnetic sleeve 3 matches the vibration damping magnetic rod 12; the knife bar 2 has a central hole 21 and a vibration damping hole 22; the vibration damping hole is located at the other end of the knife bar 2, that is, the end away from the knife tooth 1; the short magnetic sleeve 3, the long magnetic sleeve 4, the coil 5, and the coil frame 6 are arranged in the vibration damping hole 22; one end of the vibration damping magnetic rod 12 is inserted into the long magnetic sleeve 4, the coil frame 6, the short magnetic sleeve 3, and the central hole 21 of the knife bar 2, until the knife tooth 1 is located; on the side wall where the short magnetic sleeve 3 is located, there is a magnetic fluid injection hole 14, which penetrates the cylinder wall of the long magnetic sleeve 4 and the knife bar 2.

[0005] Furthermore, this utility model provides a magnetic fluid vibration-damping milling cutter that can be injected with a cooling medium, which may also have the following features: it further includes an axial vibration damping assembly; the axial vibration damping assembly includes: a sealing ring 7, a pressure cylinder 8, an elastic pad 9, and a spring 10; the sealing ring 7 is disposed in the vibration damping hole 22, and the center diameter of the sealing ring 7 matches the vibration damping magnetic guide rod 12, pressing against the other end of the long magnetic guide sleeve 4; the pressure cylinder 8 is disposed in the vibration damping hole 22, and the center hole of the pressure cylinder 8 matches the vibration damping magnetic guide rod 12; one end of the vibration damping magnetic guide rod 12 is also inserted into the pressure cylinder 8 and the sealing ring 7, and the other end has a positioning boss; the spring 10 presses against one side of the positioning boss of the vibration damping magnetic guide rod 12. The elastic pad 9 is sleeved outside the spring 10 and also presses against one side of the positioning boss of the vibration damping magnetic guide rod 12.

[0006] Furthermore, the present invention provides a magnetohydrodynamic vibration damping end mill that can be injected with a cooling medium, and may also have the following features: it further includes a tool holder 11; the tool holder 11 can be fixedly connected to the other end of the tool shank 2.

[0007] Furthermore, this utility model provides a magnetic fluid vibration damping end mill that can be injected with a cooling medium, and it may also have the following features: the center positions of the cutting tooth 1, the vibration damping magnetic rod 12, and the tool holder 11 are respectively provided with a cutting tooth through hole 101, a vibration damping magnetic rod through hole 1201, and a tool holder through hole 1101, and these three through holes form a cooling channel.

[0008] Furthermore, this utility model provides a magnetohydrodynamic vibration damping milling cutter that can be injected with a cooling medium, and may also have the following feature: the cutter teeth 1 and the cutter shank 2 are fixed by brazing or mechanical means.

[0009] Furthermore, this utility model provides a magnetohydrodynamic vibration damping milling cutter that can be injected with a cooling medium, and it may also have the following feature: the cutting teeth 1 and the cutter shank 2 are integrally formed.

[0010] This invention provides a magnetorheological (MHL) vibration-damping end mill with an injectable cooling medium. The internal MHL, under the influence of an external magnetic field, can transform from a Newtonian fluid to a viscoplastic semi-solid or solid within milliseconds, and this transformation is reversible. This phenomenon is called the magnetorheological effect. Since the discovery of the magnetorheological effect, MHL vibration dampers, using MHL as the working medium, have been used as semi-active damping devices. Due to their good controllability, simple structure, low energy consumption, and fast response, they can effectively absorb the vibration of the end mill during milling.

[0011] This invention provides a magnetohydrodynamic (MHD) vibration-damping end mill that can be injected with a cooling medium. The unique viscosity and damping characteristics of MHD under the action of an external magnetic field, as well as its fast response speed, are used to build a closed-loop feedback control system, ultimately realizing the active vibration reduction control of the self-sensing MHD vibration-damping end mill. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the magnetohydrodynamic vibration damping milling cutter that can be injected with cooling medium in the embodiment.

[0013] Figure 2 yes Figure 1 Enlarged view of part A.

[0014] Figure 3 This is a structural diagram of the radial vibration damping component in the embodiment. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0016] Example

[0017] In this embodiment, the magnetohydrodynamic vibration-damping milling cutter that can be injected with cooling medium includes: cutter teeth 1, cutter shank 2, radial vibration damping assembly, axial vibration damping assembly and cutter holder 11.

[0018] The cutting tooth 1 is fixed to one end of the tool holder 2, which can be achieved by brazing or mechanical fixation. During milling, the magnetohydrodynamic vibration damping milling cutter, which can be injected with cooling medium, rotates at high speed, and the cutting tooth 1 directly contacts the workpiece to perform machining.

[0019] The radial vibration damping assembly includes: a short magnetic sleeve 3, a long magnetic sleeve 4, a coil 5, a coil frame 6, and a vibration damping magnetic rod 12.

[0020] The outer surface of the long magnetic sleeve 4 mates with the inner surface of the vibration-damping magnetic rod 12, and the inner surface of the long magnetic sleeve 4 mates with the outer surface of the vibration-damping magnetic rod 12. The coil 5 is wound on the coil frame 6; the coil frame 6 with the coil 5 wound on it is embedded inside the long magnetic sleeve 4; the inner surface of the coil frame 6 mates with the outer surface of the vibration-damping magnetic rod 12. The short magnetic sleeve 3 is embedded inside the long magnetic sleeve 4 and connected in series with the coil frame 6; the inner surface of the short magnetic sleeve 3 mates with the outer surface of the vibration-damping magnetic rod 12.

[0021] The tool holder 2 has a central hole 21 and a vibration damping hole 22; the central hole 21 is equipped with a vibration damping magnetic rod 12, and the vibration damping hole 22 is equipped with a radial vibration damping component and an axial vibration damping component.

[0022] The short magnetic sleeve 3, the long magnetic sleeve 4, the coil 5, and the coil frame 6 are set inside the vibration damping hole 22, and one end of the short magnetic sleeve 3 and the long magnetic sleeve 4 are in contact with the end face of the vibration damping hole 22.

[0023] The axial vibration damping assembly includes: a sealing ring 7, a pressure cylinder 8, an elastic pad 9, and a spring 10.

[0024] A sealing ring 7 is disposed in the vibration damping hole 22, located between the long magnetic sleeve 4 and the pressure cylinder 8. The inner surface of the sealing ring 7 mates with the outer surface of the vibration damping magnetic rod 12. The pressure cylinder 8 is disposed in the vibration damping hole 22, and its inner surface mates with the outer surface of the vibration damping magnetic rod 12. The sealing ring 7 should have good sealing performance and vibration damping function to prevent leakage of the magnetic fluid on the left side and serve as a buffer between the long magnetic sleeve 4 and the pressure cylinder 8.

[0025] The vibration damping magnetic rod 12 is located inside the holes of the knife bar 2, pressure cylinder 8, sealing ring 7, long magnetic sleeve 4, coil frame 6, and short magnetic sleeve 3.

[0026] On the side wall where the short magnetic sleeve 3 is located, there is a magnetic fluid injection hole 14, which penetrates the cylinder wall of the long magnetic sleeve 4 and the tool holder 2. Magnetic fluid 13 enters the gap between the short magnetic sleeve 3 and the long magnetic sleeve 4 through the magnetic fluid injection hole 14.

[0027] Spring 10 presses against one side of the positioning boss of the vibration-damping magnetic rod 12. Elastic pad 9, cylindrical in shape, is fitted over spring 10 and also presses against one side of the positioning boss of the vibration-damping magnetic rod 12. Elastic pad 9 and spring 10 provide elastic support for the vibration-damping magnetic rod 12, working together to dampen vibration. Tool holder 11 can be fixedly connected to the other end of tool holder 2 via a threaded connection.

[0028] In this embodiment, the center of the cutting tooth 1, the vibration damping magnetic rod 12, and the tool holder 11 is respectively provided with a cutting tooth through hole 101, a vibration damping magnetic rod through hole 1201, and a tool holder through hole 1101. These three through holes form a cooling channel. The heat emitted by the milling cutter during operation and the heat emitted by the magnetic fluid vibration damping structure can be dissipated through the cooling channel. In addition, the heat emitted by the milling cutter during operation can be carried away by injecting a cooling medium into the cooling channel.

[0029] Working process of a magnetohydrodynamic (MHD) vibration-damping end mill that can be injected with cooling medium:

[0030] like Figure 3 As shown, when the power is turned on, coil 5 is powered, and the wires extend from the cooling channel. The damping magnetic shaft 12 at the center of the tool holder 2 is magnetized, generating an axial magnetic field. The magnetic field lines pass radially and perpendicularly through the short magnetic sleeve 3 and enter the magnetic fluid 13; after passing radially through the magnetic fluid 13, they pass axially through the long magnetic sleeve 4, and finally radially through the long magnetic sleeve 4 and enter the damping magnetic shaft 12, forming a closed magnetic circuit. By controlling the magnitude of the current in coil 5, magnetic fields of different intensities can be obtained in the working gap, thereby indirectly controlling the viscosity of the magnetic fluid 13.

[0031] When the milling cutter rotates, due to the load, the damping magnetic shaft 12 squeezes the magnetic fluid in the working gap to form a dynamic pressure oil film. When the current is adjusted, the viscosity of the magnetic fluid 13 can be changed. The magnetic particles in the magnetic fluid 13 are polarized and arranged in a chain, which in turn generates shear yield strength, controls the radial vibration of the shaft, and achieves the effect of energy absorption and vibration reduction.

[0032] The magnetohydrodynamic vibration damping end mill of the present invention has a fast response speed and good controllability. It can inject a suitable cooling medium according to the process, or it can be directly used as a heat dissipation channel to cool the end mill. The present invention has good axial and radial vibration damping performance, is sensitive to response, and has good technical effects.

[0033] The embodiments described above are merely some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A magnetohydrodynamic (MHD) vibration-damping end mill that can be injected with a cooling medium, characterized in that: include: Cutting teeth (1), cutting bar (2), radial vibration damping assembly; Among them, the cutting tooth (1) is fixed at one end of the cutting rod (2); The radial vibration damping assembly includes: a short magnetic sleeve (3), a long magnetic sleeve (4), a coil (5), a coil frame (6), and a vibration damping magnetic rod (12); The outer surface of the long magnetic sleeve (4) matches the inner surface of the vibration-damping magnetic rod (12), and the inner surface of the long magnetic sleeve (4) matches the outer surface of the vibration-damping magnetic rod (12); the coil (5) is wound on the coil frame (6); the coil frame (6) with the coil (5) wound on it is embedded in the long magnetic sleeve (4); the center diameter of the coil frame (6) matches the outer surface of the vibration-damping magnetic rod (12); the short magnetic sleeve (3) is embedded in the long magnetic sleeve (4) and pressed on the coil frame (6); the inner surface of the short magnetic sleeve (3) matches the outer surface of the vibration-damping magnetic rod (12); The tool holder (2) has a central hole (21) and a shock-absorbing hole (22); The short magnetic sleeve (3), the long magnetic sleeve (4), the coil (5), and the coil frame (6) are disposed inside the shock-absorbing hole (22); The vibration damping magnetic rod (12) is located inside the holes of the knife bar (2), the long magnetic sleeve (4), the coil frame (6), and the short magnetic sleeve (3); The short magnetic sleeve (3) has a magnetic fluid injection hole (14) on its side wall, which penetrates the walls of the long magnetic sleeve (4) and the knife bar (2).

2. The magnetohydrodynamic vibration damping end mill with injectable cooling medium as described in claim 1, characterized in that: It also includes axial vibration damping components; The axial vibration damping assembly includes: a sealing ring (7), a pressure cylinder (8), an elastic pad (9), and a spring (10); The sealing ring (7) is disposed in the damping hole (22) and located between the long magnetic sleeve (4) and the pressure cylinder (8); the central hole diameter of the sealing ring (7) is matched with the damping magnetic rod (12); The pressure cylinder (8) is disposed in the damping hole (22), and the inner surface of the pressure cylinder (8) is in contact with the outer surface of the damping magnetic rod (12); One end of the vibration damping magnetic rod (12) is also inserted into the pressure cylinder (8) and the sealing ring (7), and the other end has a positioning boss; The spring (10) presses against one side of the positioning boss of the vibration damping magnetic rod (12); the elastic pad (9) is sleeved outside the spring (10) and also presses against one side of the positioning boss of the vibration damping magnetic rod (12).

3. The magnetohydrodynamic vibration damping end mill with injectable cooling medium as described in claim 2, characterized in that: It also includes the handle (11); The handle (11) can be fixedly connected to the other end of the shank (2).

4. The magnetohydrodynamic vibration damping end mill with injectable cooling medium as described in claim 3, characterized in that: in, The center of the blade (1), the vibration damping magnetic rod (12), and the handle (11) each have a blade through hole (101), a vibration damping magnetic rod through hole (1201), and a handle through hole (1101), which together form a cooling channel.

5. The magnetohydrodynamic vibration damping end mill with injectable cooling medium as described in claim 1, characterized in that: in, The cutting teeth (1) and the cutting rod (2) are fixed by brazing or mechanical means.

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