A high-precision milling cutter based on magnetorheological elastomer

Abstract

The invention relates to a high-precision milling cutter based on a magnetorheological elastomer, comprising a milling cutter body and a shock absorbing device, wherein the shock absorbing device comprises a cylinder body, a magnetorheological elastomer, a wire frame and a coil, wherein the milling cutter body penetrates the cylinder body; the magnetorheological elastomer is internally sleeved in the cylinder body and externally sleeved on the milling cutter body; the wire frame is sleeved on the cylinder body, and the coil is wound on the wire frame, when current is input to the coil, magnetic lines of force are generated from the milling cutter body and radially pass through the magnetorheological elastomer to enter the cylinder body, and move along the axial direction of the cylinder body, and then pass through the magnetorheological elastomer from the radial direction of the cylinder body back to the milling cutter body, forming a closed loop; when the magnetic lines of force radially pass through the magnetorheological elastomer, the magnetic particles in the magnetorheological elastomer are distributed radially, thereby generating shear force, and suppressing the vibration generated by the milling cutter body during rotational motion.

Description

Technical Field

[0001] The invention relates to the technical field of milling cutters, and in particular to a high-precision milling cutter based on magnetorheological elastomer. Background Art

[0002] A milling cutter is a rotary tool with one or more teeth used for milling. When working, each tooth cuts off the excess of the workpiece in turn and intermittently. The milling cutter is mainly used to process planes, steps, grooves, forming surfaces and cut off workpieces on milling machines. When using a milling cutter for processing, the tool bar will vibrate severely due to rapid rotation, and may even break and stretch the tool, resulting in poor processing quality or inability to process, greatly reducing work efficiency and causing potential safety hazards in production. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a high-precision milling cutter based on magnetorheological elastomer, including a milling cutter body and a shock absorbing device, wherein the shock absorbing device includes a cylinder body, a magnetorheological elastomer, a wire frame and a coil, the milling cutter body passes through the cylinder body; the magnetorheological elastomer is internally sleeved in the cylinder body, and externally sleeved on the milling cutter body; the wire frame is sleeved on the cylinder body, and the coil is wound on the wire frame. When current is input to the coil, magnetic lines of force are generated from the milling cutter body and radially pass through the magnetorheological elastomer to enter the cylinder body, and move along the axial direction of the cylinder body, and then pass through the magnetorheological elastomer from the radial direction of the cylinder body back to the milling cutter body, forming a closed loop; when the magnetic lines of force radially pass through the magnetorheological elastomer, the magnetic particles in the magnetorheological elastomer are distributed radially, thereby generating shear force to suppress the vibration generated by the milling cutter body during rotation.

[0004] Preferably, the cylinder body comprises a shock absorbing cylinder and an upper end cover and a lower end cover fixedly arranged at the upper and lower ends of the shock absorbing cylinder;

[0005] The magnetorheological elastomer is in a cylindrical shape and is axially fixed in the shock absorbing cylinder;

[0006] The milling cutter body axially penetrates the central hole of the magnetorheological elastomer, and its upper and lower ends respectively pass through the upper end cover and the lower end cover. The milling cutter body can rotate relative to the magnetorheological elastomer.

[0007] Preferably, a flange is provided on the middle outer wall of the milling cutter body, and the flange, the upper end cover and the lower end cover are all provided with interconnected heat dissipation holes.

[0008] Preferably, the shock-absorbing cylinder comprises an inner cylinder and an outer cylinder coaxially arranged at intervals, the inner cylinder and the outer cylinder are fixed at one end, an annular groove is formed between the outer cylinder and the inner cylinder, and the wire frame is embedded in the annular groove;

[0009] The outer wall of the magnetorheological elastomer is fixedly embedded on the inner wall of the inner cylinder.

[0010] Preferably, a boss is provided in the middle of the upper end surface of the lower end cover, and the boss extends into the inner cylinder and abuts against the magnetorheological elastomer.

[0011] Preferably, the milling cutter body and the shock-absorbing cylinder are both pure iron with high magnetic permeability and high magnetic saturation intensity.

[0012] Preferably, the magnetorheological elastomer is a solid structure composed of hydroxy iron powder, 704 silicone rubber and dimethyl silicone oil in a mass fraction ratio of 2:7:1.

[0013] Preferably, it also includes an eddy current displacement sensor, a control module and a power module, the eddy current displacement sensor is electrically connected to the control module, and the power module is electrically connected to the control module and the coil respectively; the eddy current displacement sensor is used to collect displacement data of the milling cutter body in the X-axis and Y-axis directions, and transmit it to the control module, and the control module controls the current input into the coil by the power module according to the collected displacement data.

[0014] Preferably, the eddy current displacement sensor comprises an X-direction eddy current displacement sensor for measuring the displacement of the milling cutter body in the X-direction and a Y-direction eddy current displacement sensor for measuring the displacement of the milling cutter body in the Y-direction.

[0015] Preferably, the X-direction eddy current displacement sensor is arranged at the lower end of the cylinder body through an X-direction sensor bracket, and the Y-direction eddy current displacement sensor is arranged at the lower end of the cylinder body through a Y-direction sensor bracket.

[0016] Compared with the prior art, the present invention has the following technical effects:

[0017] 1. In the high-precision milling cutter based on magnetorheological elastomer of the present invention, when current is input into the shock absorbing device, magnetic lines of force are generated from the milling cutter body and radially pass through the annular magnetorheological elastomer to enter the shock absorbing cylinder, and move axially, and then radially pass through the annular magnetorheological elastomer from the shock absorbing cylinder back to the milling cutter body, forming a closed loop. When the magnetic lines of force radially pass through the annular magnetorheological elastomer, the magnetic particles in the elastomer are distributed radially, thereby generating shear force, preventing the relative rotational movement between the milling cutter body and the shock absorbing cylinder, and playing a role in buffering and shock absorption.

[0018] 2. The high-precision milling cutter based on magnetorheological elastomer of the present invention does not need to consider the sealing problem of the shock absorbing device.

[0019] 3. The high-precision milling cutter based on magnetorheological elastomer of the present invention has four heat dissipation holes evenly distributed on the raised flange in the middle of the milling cutter body, the upper end cover and the circumference of the lower end cover to dissipate the heat generated by friction during operation, and the heat dissipation performance of the shock absorbing device is excellent.

[0020] 4. The high-precision milling cutter based on magnetorheological elastomer of the present invention adopts magnetorheological elastomer with fast reaction speed, good reversibility and strong controllability to achieve high control accuracy and sensitive reaction.

[0021] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 A cross-sectional view of a high-precision milling cutter based on magnetorheological elastomer provided in a preferred embodiment of the present invention;

[0024] Figure 2 An assembly diagram of a high-precision milling cutter based on magnetorheological elastomer provided for a preferred embodiment of the present invention;

[0025] Figure 3 A disassembly diagram of a high-precision milling cutter based on magnetorheological elastomer provided in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined Figures 1 to 3 A high-precision milling cutter based on magnetorheological elastomer provided by the present invention is described in detail. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given. However, the protection scope of the present invention is not limited to the following embodiments. Those skilled in the art can modify and polish it without changing the spirit and content of the present invention.

[0027] Please refer to Figures 1 to 3A high-precision milling cutter based on magnetorheological elastomer comprises a milling cutter body 1 and a shock absorbing device, wherein the shock absorbing device comprises a cylinder body 2, a magnetorheological elastomer 3, a wire frame 4 and a coil 5, wherein the milling cutter body 1 penetrates the cylinder body 2; the magnetorheological elastomer 3 is sleeved in the cylinder body 2 and sleeved on the milling cutter body 1; the wire frame 4 is sleeved on the cylinder body 2, and the coil 5 is wound on the wire frame 4. When current is input to the coil 5, magnetic lines of force are generated from the milling cutter body 1 and radially pass through the magnetorheological elastomer 3 to enter the cylinder body 2, and move along the axial direction of the cylinder body 2, and then pass through the magnetorheological elastomer 3 from the radial direction of the cylinder body 2 back to the milling cutter body 1, forming a closed loop; when the magnetic lines of force radially pass through the magnetorheological elastomer 3, the magnetic particles in the magnetorheological elastomer 3 are distributed radially, thereby generating shear force, suppressing the vibration generated by the milling cutter body 1 during rotational motion, and playing a role of buffering and shock absorption.

[0028] In this embodiment, the cylinder body 2 includes a shock absorbing cylinder 22 and an upper end cover 21 and a lower end cover 23 fixed at the upper and lower ends of the shock absorbing cylinder 22 by threaded fasteners;

[0029] The magnetorheological elastomer 3 is cylindrical and axially fixed in the shock-absorbing cylinder 22. For example, the magnetorheological elastomer 3 and the shock-absorbing cylinder 22 are fixed by interference fit.

[0030] The milling cutter body 1 axially passes through the central hole of the magnetorheological elastomer 3 , and its upper and lower ends respectively pass through the upper end cover 21 and the lower end cover 23 . The milling cutter body 1 can rotate relative to the magnetorheological elastomer 3 .

[0031] The middle outer wall of the milling cutter body 1 is provided with a flange 11, and the flange 11, the upper end cover 21 and the lower end cover 23 are provided with interconnected heat dissipation holes 10 for dissipating the heat generated by friction when the milling cutter body 1 is working. In this embodiment, the flange 11 and the magnetorheological elastomer 3 are clearance-matched.

[0032] In this embodiment, the shock-absorbing cylinder 22 includes an inner cylinder 222 and an outer cylinder 221 coaxially spaced apart, the inner cylinder 222 and the outer cylinder 221 are fixed at one end, and an annular groove 223 is formed between the outer cylinder 221 and the inner cylinder 222. The upper end or the lower end of the inner cylinder 222 and the outer cylinder 221 may be fixed, and this embodiment takes the upper end of the inner cylinder 222 and the outer cylinder 221 as an example, the wire frame 4 is inserted into the annular groove 223 from the lower end of the annular groove 223, and the wire frame 4 is embedded in the annular groove 223;

[0033] The outer wall of the magnetorheological elastomer 3 is fixedly embedded on the inner wall of the inner cylinder 222 .

[0034] A boss is provided in the middle of the upper end surface of the lower end cover 23 , and the boss extends into the inner cylinder 222 and abuts against the magnetorheological elastomer 3 .

[0035] In this embodiment, the milling cutter body 1 and the shock-absorbing cylinder 22 are both pure iron with high magnetic permeability and high magnetic saturation strength, and the upper end cover 21 and the lower end cover 23 are both non-magnetic. The magnetorheological elastomer 3 is composed of hydroxyl iron powder, 704 silicone rubber and dimethyl silicone oil in a mass fraction ratio of 2:7:1, thereby ensuring that it has good shear mechanical properties. Moreover, the annular magnetorheological elastomer 3 is solid, so there is no need to consider its sealing problem.

[0036] In this embodiment, the appropriate damping force can be generated by changing the current of the coil 5. As an embodiment, the current of the coil 5 can be directly controlled by the power supply. As another embodiment, the displacement data of the milling cutter body 1 in the X-axis and Y-axis directions during operation is collected by the eddy current displacement sensor to control the current output by the power supply. The specific structure is as follows:

[0037] A high-precision milling cutter based on magnetorheological elastomer also includes an eddy current displacement sensor, a control module and a power module. The eddy current displacement sensor is electrically connected to the control module, and the power module is electrically connected to the control module and the coil 5 respectively; the eddy current displacement sensor is used to collect displacement data of the milling cutter body 1 in the X-axis and Y-axis directions, and transmit it to the control module. The control module controls the current input to the coil 5 by the power module according to the collected displacement data. The eddy current displacement sensor includes an X-direction eddy current displacement sensor 7 for measuring the displacement of the milling cutter body 1 in the X-direction and a Y-direction eddy current displacement sensor 9 for measuring the displacement of the milling cutter body 1 in the Y-direction. The X-direction eddy current displacement sensor 7 is arranged at the upper end and the lower end of the cylinder body 2 through the X-direction sensor bracket 6. Taking the lower end as an example, the Y-direction eddy current displacement sensor 9 is arranged on the lower end surface of the lower end cover 23 of the cylinder body 2 through the Y-direction sensor bracket 8. In this embodiment, in the same plane circle with the central axis of the milling cutter body 1 as the rotation center, the X-direction eddy current displacement sensor 7 and the Y-direction eddy current displacement sensor 9 are distributed at 90 degrees.

[0038] When the milling cutter body 1 is driven by the power mechanism to rotate violently, the X-direction eddy current displacement sensor 7 and the Y-direction eddy current displacement sensor 9, which are horizontally distributed at 90 degrees with the central axis of the milling cutter body 1 as the rotation center, respectively collect the displacement data of the milling cutter body 1 in the X-axis and Y-axis directions, and transmit them to the control module. The control module controls the current of the power module input coil 5 according to the collected displacement data, so that the magnetic lines of force are generated from the milling cutter body 1 and radially pass through the magnetorheological elastomer 3 to enter the shock-absorbing cylinder 22, and move along the axial direction of the shock-absorbing cylinder 22, and then radially pass through the magnetorheological elastomer 3 from the shock-absorbing cylinder 22 back to the milling cutter body 1, forming a closed loop. When the magnetic lines of force radially pass through the annular magnetorheological elastomer 3, the magnetic particles in the elastomer are distributed radially, thereby generating shear force, preventing the relative rotation of the milling cutter body 1 and the shock-absorbing cylinder 22, and playing a role in buffering and shock reduction.

Claims

1. A high-precision milling cutter based on magnetorheological elastomer, characterized in that: The invention comprises a milling cutter body and a shock absorbing device, wherein the shock absorbing device comprises a cylinder body, a magnetorheological elastomer, a wire frame and a coil, wherein the milling cutter body penetrates the cylinder body; the magnetorheological elastomer is sleeved in the cylinder body and sleeved on the milling cutter body; the wire frame is sleeved on the cylinder body, and the coil is wound on the wire frame. When current is input to the coil, magnetic lines of force are generated from the milling cutter body and radially pass through the magnetorheological elastomer to enter the cylinder body, and move along the axial direction of the cylinder body, and then pass through the magnetorheological elastomer from the radial direction of the cylinder body back to the milling cutter body, forming a closed loop; when the magnetic lines of force radially pass through the magnetorheological elastomer, the magnetic particles in the magnetorheological elastomer are distributed radially, thereby generating shear force, and suppressing the vibration generated by the milling cutter body during rotational motion; The cylinder body comprises a shock absorbing cylinder and an upper end cover and a lower end cover fixedly arranged at the upper and lower ends of the shock absorbing cylinder; The magnetorheological elastomer is in a cylindrical shape and is axially fixed in the shock absorbing cylinder; The milling cutter body axially passes through the central hole of the magnetorheological elastomer, and its upper and lower ends respectively pass through the upper end cover and the lower end cover, and the milling cutter body can rotate relative to the magnetorheological elastomer; A flange is provided on the middle outer wall of the milling cutter body, and the flange, the upper end cover and the lower end cover are all provided with interconnected heat dissipation holes; The shock-absorbing cylinder comprises an inner cylinder and an outer cylinder coaxially arranged at intervals, the inner cylinder and the outer cylinder are fixed at one end, an annular groove is formed between the outer cylinder and the inner cylinder, and the wire frame is embedded in the annular groove; The outer wall of the magnetorheological elastomer is fixedly embedded on the inner wall of the inner cylinder; The magnetorheological elastomer is a solid structure composed of hydroxy iron powder, 704 silicone rubber and dimethyl silicone oil in a mass fraction ratio of 2:7:1; It also includes an eddy current displacement sensor, a control module and a power module, wherein the eddy current displacement sensor is electrically connected to the control module, and the power module is electrically connected to the control module and the coil respectively; the eddy current displacement sensor is used to collect displacement data of the milling cutter body in the X-axis and Y-axis directions, and transmit the data to the control module, and the control module controls the current input to the coil by the power module according to the collected displacement data; The eddy current displacement sensor comprises an X-direction eddy current displacement sensor for measuring the displacement of the milling cutter body in the X-direction and a Y-direction eddy current displacement sensor for measuring the displacement of the milling cutter body in the Y-direction.

2. A high-precision milling cutter based on magnetorheological elastomer as claimed in claim 1, characterized in that: A boss is provided in the middle of the upper end surface of the lower end cover, and the boss extends into the inner cylinder and abuts against the magnetorheological elastomer.

3. A high-precision milling cutter based on magnetorheological elastomer as claimed in claim 1, characterized in that: The milling cutter body and the damping cylinder are both pure iron with high magnetic permeability and high magnetic saturation intensity.

4. A high-precision milling cutter based on magnetorheological elastomer as claimed in claim 1, characterized in that: The X-direction eddy current displacement sensor is arranged at the lower end of the cylinder body through an X-direction sensor bracket, and the Y-direction eddy current displacement sensor is arranged at the lower end of the cylinder body through a Y-direction sensor bracket.

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