Ultrasonic milling device

Abstract

The invention relates to the technical field of machining, in particular to an ultrasonic milling device which comprises a milling platform, a spindle and the like. A main shaft capable of moving up and down, left and right and front and back is mounted on the milling platform; and a cutting fluid nozzle is mounted on the main shaft. Compared with a conventional ultrasonic milling device, the telescopic state of the end milling cutter is controlled through the first driving part, so that the cutter replacement operation between the face milling cutter and the end milling cutter is completed under the condition that the main shaft does not stop, the time spent on replacing the milling cutter in the milling process of a machined part is shortened, and the milling efficiency is improved; and the baffle and the annular air bag jointly prevent cutting fluid from splashing into the sleeve, collision between cuttings and the end mill is avoided, and abrasion to the end mill is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of machining, and in particular to an ultrasonic milling device. Background Art

[0002] In the prior art, ultrasonic vibration-assisted milling technology is often used to mill titanium alloy materials to improve the milling quality of titanium alloy workpieces. For workpieces with some complex geometric shapes, usually a face milling cutter is first used to rough-machine the upper surface of the workpiece, and then an end milling cutter is used to preliminarily correct the contour and side walls of the workpiece. Then, the face milling cutter is used to finish-mill the plane, and finally the end milling cutter is used to drill holes or chamfer the workpiece. Therefore, during the whole machining process, it is necessary to frequently replace the face milling cutter and the end milling cutter, and the replacement of the milling cutter needs to stop the machine, thus suspending the machining process and reducing the milling efficiency.

[0003] In summary, the present application proposes an ultrasonic milling device to improve the above-mentioned technical problems. Summary of the Invention

[0004] In order to overcome the drawback that during the process of ultrasonic vibration-assisted milling of titanium alloy workpieces with complex geometric shapes, due to the need to frequently replace the face milling cutter and the end milling cutter for machining different processes, it is necessary to stop the machine to replace the cutter, reducing the overall milling efficiency, the present invention provides an ultrasonic milling device.

[0005] The technical implementation solution of the present invention is: an ultrasonic milling device, including a milling platform and a main shaft; a main shaft that can move up and down, left and right, and front and back is installed on the milling platform; a cutting fluid nozzle is installed on the main shaft; it further includes an ultrasonic tool holder, a connecting plate, a face milling cutter, a connecting plate, an end milling cutter, a first driving member, and an auxiliary protection component; a rotating shaft is rotatably connected to the main shaft; an ultrasonic tool holder is clamped under the rotating shaft; an ultrasonic generating component is arranged inside the ultrasonic tool holder; high-frequency mechanical vibration is generated by the ultrasonic generating component; a connecting plate is fixedly connected to the lower side of the ultrasonic tool holder; a face milling cutter is fixedly connected to the lower side of the connecting plate; a plurality of cutting teeth are arranged on the face milling cutter; a sleeve is fixedly connected to the lower side of the connecting plate; the sleeve penetrates through the middle of the face milling cutter; a first driving member is fixedly connected inside the sleeve; a connecting plate is installed on the telescopic end of the first driving member; an end milling cutter is fixedly connected to the lower side of the connecting plate; the end milling cutter is located inside the sleeve; an auxiliary protection component for protecting the inside of the sleeve is installed inside the main shaft.

[0006] Furthermore, the auxiliary protection component includes a baffle, an annular airbag, and a pneumatic slip ring; a baffle for preventing cutting fluid from entering the inside of the sleeve is installed at the bottom of the sleeve; the lowermost side of the baffle is higher than the lowermost side of the cutting teeth; a through hole is provided at the center of the baffle; an annular airbag is installed at the through hole of the baffle; the annular airbag is made of high-temperature-resistant silicone rubber; a pneumatic slip ring is fixedly connected to the main shaft; the pneumatic slip ring is divided into a stator and a rotor, the stator is connected to the main shaft, and the rotor is sleeved outside the rotating shaft; the stator and the rotor are rotatably connected; three air delivery circuits are provided between the stator and the rotor; the air inlet of each air delivery circuit is connected to an external air pump; the air outlet of one of the air delivery circuits is connected to the inside of the annular airbag through an air delivery hose, and the air delivery hose passes through the ultrasonic tool shank, the connecting plate, and the sleeve in sequence.

[0007] Furthermore, a first cavity arranged in a ring shape is provided inside the baffle; a plurality of first exhaust holes are provided on the circumferential edge of the baffle; all the first exhaust holes communicate with the first cavity; and all the first exhaust holes are inclined downward; the first cavity communicates with one of the air delivery circuits through an air delivery hose.

[0008] Furthermore, a second cavity arranged in a ring shape is provided inside the baffle; a plurality of second exhaust holes arranged in a ring shape are provided at the bottom of the baffle; all the second exhaust holes communicate with the second cavity; the second cavity communicates with the remaining air delivery circuits through an air delivery hose.

[0009] Furthermore, a flow guiding block is provided at the bottom of the baffle; the shape of the flow guiding block is set as an inverted cone.

[0010] Furthermore, two guiding blocks are provided on the connecting plate; guiding grooves corresponding to the shapes of the guiding blocks are provided on the inner wall of the sleeve.

[0011] Furthermore, the auxiliary protection component further includes a second driving member; the baffle is arranged to be slidably connected to the sleeve; a plurality of second driving members are fixedly connected inside the sleeve; the telescopic ends of all the second driving members are jointly fixedly connected to the baffle; the baffle is driven to move up and down by the second driving member.

[0012] Furthermore, an annular mask and a fixing ring are further included; an annular mask is fixedly connected to the bottom of the sleeve; a plurality of first limiting blocks are fixedly connected to the bottom of the annular mask; a fixing ring is fixedly connected to the upper side of the fixing ring; a rotating ring is rotatably connected to the fixing ring; a plurality of L-shaped clamping grooves are provided on the rotating ring; each first limiting block is located in an adjacent L-shaped clamping groove.

[0013] Furthermore, a second limiting block is further included; a plurality of first limiting slots are provided on the connecting plate; a second limiting block is slidably connected in each first limiting slot; a plurality of second limiting slots are provided on each face milling cutter; each second limiting slot communicates with an adjacent first limiting slot; the contour of the second limiting slot is consistent with the contour of the second limiting block.

[0014] Furthermore, it further includes a third limit block; several protruding blocks are provided on the end mill; several third limit blocks are slidably connected to the bottom of the connecting plate through springs; each third limit block is clamped with an adjacent protruding block; the opposite sides of the two third limit blocks are provided as extrusion parts; inclined surfaces are provided on the extrusion parts, and the extrusion parts are slidably connected to adjacent guide grooves.

[0015] The present invention has the following advantages:

[0016] Compared with the conventional ultrasonic milling device, by controlling the telescopic state of the end mill through the first driving member, the tool change operation between the face mill and the end mill can be completed without stopping the main shaft, thereby reducing the time spent on changing the milling cutter during the milling process of the workpiece and improving the milling efficiency;

[0017] By jointly blocking the splashing of the cutting fluid into the sleeve by the baffle and the annular airbag, the collision between the chips and the end mill is avoided, and the wear of the end mill is reduced;

[0018] The chips at the cutting teeth are blown away from the side of the face mill by the air blown out through the first exhaust hole, avoiding the accumulation of chips at the center of the face mill, thereby avoiding the situation of secondary milling and improving the machining quality of the surface of the workpiece;

[0019] The chips in the air-carrying holes are discharged outwards, accelerating the discharge of the chips in the drill hole, avoiding the accumulation of chips in the drill hole, thereby reducing the wear of the end mill and avoiding scratching or burring of the hole wall, and improving the quality of the drill hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural schematic diagram of the ultrasonic milling device of the present invention;

[0021] Figure 2 is Figure 1 an enlarged view of area A of

[0022] Figure 3 is a three-dimensional structural schematic diagram of the ultrasonic tool shank, connecting plate and face mill combination of the present invention;

[0023] Figure 4 is an exploded view of the ultrasonic tool shank, connecting plate and face mill of the present invention;

[0024] Figure 5 is a cross-sectional view of the connecting plate and face mill combination of the present invention;

[0025] Figure 6 is Figure 5 an enlarged view of area B of

[0026] Figure 7 is a three-dimensional structural schematic diagram of the baffle and annular airbag combination of the present invention;

[0027] Figure 8 Schematic three-dimensional structure diagram of the connecting plate, connecting block and end mill combination of the present invention;

[0028] Figure 9 Working state diagram of the end mill of the present invention;

[0029] Figure 10 Disassembly state diagram of the end mill of the present invention;

[0030] Figure 11 is Figure 10 Enlarged view of area C;

[0031] Figure 12 is Figure 10 Enlarged view of area D.

[0032] Meanings of the reference numerals in the figure: 1 - milling platform, 2 - main shaft, 2001 - rotating shaft, 3 - ultrasonic tool holder, 3001 - ultrasonic generating assembly, 4 - connecting plate, 4001 - sleeve, 4002 - guiding groove, 4003 - first limiting card slot, 5 - face mill, 5001 - cutting teeth, 5002 - second limiting card slot, 6 - connecting block, 6001 - guiding block, 7 - end mill, 7001 - protruding block, 201 - first driving member, 202 - second driving member, 203 - baffle, 20301 - first cavity, 20302 - first exhaust hole, 20303 - second cavity, 20304 - second exhaust hole, 20305 - diversion block, 204 - annular airbag, 205 - pneumatic slip ring, 20501 - air delivery circuit, 206 - annular mask, 20601 - first limiting block, 207 - fixing ring, 20701 - rotating ring, 20702 - L-shaped card slot, 301 - second limiting block, 302 - third limiting block, 30201 - extrusion part. Detailed implementation manners

[0033] Referring to an embodiment means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0034] Embodiment 1

[0035] Referring to Figures 1 - 12As shown in the figure, an ultrasonic milling device includes a milling platform 1 and a main shaft 2; the main shaft 2 is installed on the milling platform 1; a three-axis moving frame is arranged inside the milling platform 1; the main shaft 2 is driven by the three-axis moving frame to move up and down, left and right, and back and forth; a cutting fluid nozzle is installed on the main shaft 2.

[0036] It also includes an ultrasonic tool shank 3, a connecting plate 4, a face milling cutter 5, a connecting plate 6, an end milling cutter 7, a first driving member 201 and an auxiliary protection assembly; a rotating shaft 2001 is rotatably connected to the main shaft 2; a motor is arranged on the main shaft 2; the rotating shaft 2001 is driven to rotate by the motor; the ultrasonic tool shank 3 is clamped under the rotating shaft 2001; an ultrasonic generating assembly 3001 is arranged inside the ultrasonic tool shank 3; high-frequency mechanical vibration is generated by the ultrasonic generating assembly 3001; the ultrasonic generating assembly 3001 is composed of a power supply, a piezoelectric transducer and an ultrasonic horn; the piezoelectric transducer converts the electrical signal of the power supply into high-frequency mechanical vibration, and the ultrasonic horn amplifies the amplitude of the mechanical vibration; the lower side of the ultrasonic tool shank 3 is connected to the connecting plate 4 through a flange; the lower side of the connecting plate 4 is connected to the face milling cutter 5 through a thread; a plurality of cutting teeth 5001 arranged in a ring are arranged on the face milling cutter 5; a sleeve 4001 is fixedly connected to the lower side of the connecting plate 4; the sleeve 4001 penetrates through the middle of the face milling cutter 5; a first driving member 201 is fixedly connected inside the sleeve 4001, and the first driving member 201 is an electric push rod; a connecting plate 6 is installed on the telescopic end of the first driving member 201; the lower side of the connecting plate 6 is connected to the end milling cutter 7 through a thread; the end milling cutter 7 is located inside the sleeve 4001; an auxiliary protection assembly is installed inside the main shaft 2; the inside of the sleeve 4001 is protected by the auxiliary protection assembly.

[0037] The auxiliary protection assembly includes a baffle 203, an annular airbag 204 and a pneumatic slip ring 205; the baffle 203 is installed at the bottom of the sleeve 4001; the lowermost side of the baffle 203 is higher than the lowermost side of the cutting teeth 5001; a through hole is opened at the center of the baffle 203; the annular airbag 204 is installed at the through hole of the baffle 203; the annular airbag 204 is made of high-temperature-resistant silicone rubber; the pneumatic slip ring 205 is connected to the main shaft 2 through a mounting bracket; the pneumatic slip ring 205 is divided into a stator and a rotor, the stator is connected to the main shaft 2, and the rotor is sleeved outside the rotating shaft 2001; the stator and the rotor are rotatably connected; three air supply circuits 20501 are arranged between the stator and the rotor; the air inlet of each air supply circuit 20501 is connected to an external air pump; the air outlet of one of the air supply circuits 20501 is connected to the inside of the annular airbag 204 through an air supply hose, and the air supply hose passes through the ultrasonic tool shank 3, the connecting plate 4 and the sleeve 4001 in sequence.

[0038] Furthermore, to prevent chips from accumulating at the center of the face mill 5, a first cavity 20301 arranged in a ring shape is formed inside the baffle 203; a plurality of first exhaust holes 20302 are formed on the circumferential edge of the baffle 203; all the first exhaust holes 20302 communicate with the first cavity 20301; and the first exhaust holes 20302 are all inclined downward; the first cavity 20301 is communicated with one of the gas transmission circuits 20501 through a gas transmission hose.

[0039] Furthermore, to prevent chips from accumulating inside the drill hole, thereby reducing the wear of the end mill 7 and avoiding scratches or burrs on the hole wall, a second cavity 20303 arranged in a ring shape is formed inside the baffle 203; a plurality of second exhaust holes 20304 arranged in a ring shape are formed at the bottom of the baffle 203; all the second exhaust holes 20304 communicate with the second cavity 20303; the second cavity 20303 is communicated with the remaining gas transmission circuit 20501 through a gas transmission hose.

[0040] A diversion block 20305 is arranged at the bottom of the baffle 203; the shape of the diversion block 20305 is set as an inverted cone.

[0041] Furthermore, to improve the stability of the end mill 7 during milling, two symmetrically arranged guiding blocks 6001 are arranged on the connecting plate 6; guiding grooves 4002 corresponding to the shapes of the guiding blocks 6001 are formed on the inner wall of the sleeve 4001.

[0042] The auxiliary protection assembly further includes a second driving member 202; the baffle 203 is arranged to be slidably connected to the sleeve 4001; two second driving members 202 are fixedly connected inside the sleeve 4001, and the second driving member 202 is an electric push rod; the telescopic ends of all the second driving members 202 are jointly fixedly connected to the baffle 203; the baffle 203 is driven to move up and down by the second driving member 202.

[0043] It further includes an annular mask 206 and a fixing ring 207; the annular mask 206 is fixedly connected to the bottom of the sleeve 4001; two symmetrically arranged first limit blocks 20601 are fixedly connected to the bottom of the annular mask 206; a fixing ring 207 is fixedly connected to the upper side of the fixing ring 207; a rotating ring 20701 is rotatably connected to the fixing ring 207; a plurality of two symmetrically arranged L-shaped clamping grooves 20702 are formed on the rotating ring 20701; each first limit block 20601 is located inside the adjacent L-shaped clamping groove 20702.

[0044] To solve the problem that the milling efficiency is reduced due to frequent replacement of the milling cutter during the milling process, the following describes the milling process of the workpiece in detail;

[0045] First, according to the material and processing requirements of the workpiece, select face mills 5 and end mills 7 of appropriate specifications, and install them on the connecting plate 4 and the connecting board 6 respectively. The end mill 7 is housed in the sleeve 4001. Then, fix the workpiece on the fixture of the milling platform 1, drive the spindle 2 and its components to align with the workpiece through the three-axis moving frame on the milling platform 1. Then, control the motor of the spindle 2 to drive the rotating shaft 2001 and its connecting components to rotate, so as to preliminarily mill the upper surface of the workpiece through the cutting teeth 5001 on the face mill 5. At the same time, control the ultrasonic generating component 3001 on the ultrasonic tool holder 3 to start working. The electrical signal of the power supply is converted into high-frequency mechanical vibration through the piezoelectric transducer, and the vibration amplitude of the high-frequency mechanical vibration is amplified through the ultrasonic horn. Then, the high-frequency mechanical vibration is transmitted to the cutting teeth 5001 through the connecting plate 4, so that during most of the ultrasonic vibration cycle, the cutting teeth 5001 are completely separated from the workpiece and the chips, reducing the frictional force on the tool, greatly reducing the cutting heat generated, significantly reducing the cutting force, and not easily forming built-up edge, which helps to improve the machining quality of the workpiece surface. When the preliminary milling of the workpiece surface is completed, at this time, control the three-axis moving component to drive the spindle 2 and its connecting components to move upward, so that the face mill 5 is separated from the workpiece, and control the first driving member 201 to drive the connecting board 6 and the end mill 7 to move downward, so that the end mill 7 protrudes from the bottom of the face mill 5. Then, control the three-axis moving component to drive the end mill 7 to preliminarily trim the contour and side wall of the workpiece. Here, it should be noted that through the guidance and restriction of the guiding groove 4002 on the guiding block 6001, it can be ensured that the connecting board 6 and the end mill 7 move downward stably in the state of high-speed rotation, and the torque of the connecting plate 4 is transmitted to the end mill 7 through the sleeve 4001, the guiding groove 4002, the guiding block 6001 and the connecting board 6 in sequence, improving the stability of the end mill 7 during milling. When the contour and side wall of the workpiece are preliminarily trimmed, control the first driving member 201 to drive the end mill 7 to retract into the sleeve 4001, so as to finish fine milling the upper surface of the workpiece through the face mill 5. When the fine milling is completed, then control the first driving member 201 to drive the end mill 7 to extend, and perform drilling or chamfering operations on the workpiece through the end mill 7. Here, it should be noted that during the milling process of the workpiece, the cutting fluid nozzle on the spindle 2 continuously sprays cutting fluid on the milling area, so as to take away the heat generated at the milling part through the cutting fluid, reduce the working temperature of the tool, and take away the chips through the cutting fluid to prevent the chips from re-entering the milling area and causing secondary milling, thereby increasing the tool wear and affecting the surface quality of the workpiece.

[0046] Compared with the conventional ultrasonic milling device, by controlling the telescopic state of the end mill 7 through the first driving member 201, the tool change operation between the face mill 5 and the end mill 7 can be completed without stopping the spindle 2, thereby reducing the time spent on changing the milling tool during the milling process of the workpiece and improving the milling efficiency.

[0047] During the process of face milling cutter 5 milling the workpiece, there is a situation where a part of the cutting fluid carries chips and splashes into the sleeve 4001. At this time, the end milling cutter 7 is also in a high-speed rotation state, so that the chips in the sleeve 4001 collide with the end milling cutter 7, accelerating the wear of the end milling cutter 7. To avoid the occurrence of the above problems, by adding a baffle 203 and an annular airbag 204 at the bottom of the sleeve 4001, when the end milling cutter 7 is located in the sleeve 4001, an external air pump supplies air to one of the air supply circuits 20501 in the pneumatic slip ring 205, so that the compressed air enters the annular airbag 204 through the air supply hose, thereby causing the annular airbag 204 to expand. The center of the annular airbag 204 is closed, so that the baffle 203 and the annular airbag 204 jointly block the cutting fluid from splashing into the inside of the sleeve 4001, avoiding the collision between the chips and the end milling cutter 7, and reducing the wear of the end milling cutter 7. When the end milling cutter 7 needs to be used, the external air pump evacuates the annular airbag 204, so that the annular airbag 204 contracts and returns to its initial state. At this time, the diameter of the center of the annular airbag 204 is larger than the outer diameter of the end milling cutter 7, so that it is convenient for the end milling cutter 7 to pass downward through the center of the annular airbag 204. Subsequently, the external air pump inflates the annular airbag 204 to expand, so that the annular airbag 204 clamps the shank of the end milling cutter 7, thereby realizing the sealing inside the sleeve 4001 and avoiding the cutting fluid from splashing into the inside of the sleeve 4001 when the end milling cutter 7 is working. Here, it should be noted that during the milling process of the end milling cutter 7, the temperature of the shank is usually lower than 100 °C. Therefore, by setting the annular airbag 204 to be made of high-temperature-resistant silicone rubber, it is ensured that the annular airbag 204 will not be damaged when contacting the shank, and the service life of the annular airbag 204 is extended.

[0048] On this basis, when the workpiece cannot use cutting fluid due to special processing requirements, such as when milling bakelite (phenolic plastic), the bakelite will expand after contacting the cutting fluid, resulting in changes in the size of the workpiece and reducing the machining accuracy. Without using cutting fluid, it is easy to reduce the chip removal effect of the face milling cutter 5 during milling, which is likely to cause chips to accumulate at the middle position of the face milling cutter 5, causing the chips to re-enter the milling area and resulting in secondary milling, reducing the machining quality of the surface of the workpiece. Therefore, when not using cutting fluid, by controlling the second driving member 202 to drive the baffle 203 to move downward, so that the first exhaust hole 20302 faces the lowermost side of the adjacent cutting teeth 5001, and controlling the external air pump to convey air into the first cavity 20301 through the air supply circuit 20501 and its connected air supply hose, so that the air blows from the first exhaust hole 20302 to the lowermost side of the cutting teeth 5001, and the direction of air flow is from the center of the baffle 203 to the surroundings, thereby blowing the chips at the cutting teeth 5001 away from the side of the face milling cutter 5, avoiding the accumulation of chips at the center of the face milling cutter 5, and thus avoiding the occurrence of secondary milling and improving the machining quality of the surface of the workpiece.

[0049] Furthermore, during the process of drilling the workpiece with the end mill 7, due to the limitation of the hole wall, chips are generated and accumulate in the hole and cannot be discharged in time. As a result, the chips are wound around the cutting edge of the end mill 7, exacerbating the wear of the end mill 7. At the same time, it is easy to cause scratches or burrs on the hole wall, reducing the milling quality. Therefore, when the end mill 7 is drilling, the external air pump is controlled to supply air into the second cavity 20303 through the air supply circuit 20501 and the connected air supply hose, so that the compressed air blows downward into the drill hole through the second exhaust hole 20304. When it reaches the bottom of the hole, the air diffuses along the hole wall to the surrounding of the hole, so as to discharge the chips in the hole outwards through the air, accelerating the discharge of the chips in the drill hole, avoiding the accumulation of chips in the drill hole, thereby reducing the wear of the end mill 7, and avoiding scratches or burrs on the hole wall, improving the quality of the drill hole.

[0050] It is also considered that when milling can be carried out using cutting fluid, the cutting fluid carrying the chips is easily sputtered into the first exhaust hole 20302 and the second exhaust hole 20304, so that the chips accumulate in the first cavity 20301 and the second cavity 20303, causing blockage of the first cavity 20301 and the second cavity 20303. To avoid the occurrence of the above problems, the second driving member 202 is controlled to drive the baffle 203 to move upwards, so that the first exhaust hole 20302 fits against the inner wall of the face mill 5, so as to avoid chips from entering the first exhaust hole 20302, thereby avoiding blockage of the first cavity 20301 due to chip accumulation. Moreover, when the cutting fluid is sputtered onto the lower surface of the baffle 203, the inverted conical diversion block 20305 guides the cutting fluid to flow downwards, so as to avoid the cutting fluid from being directly sputtered onto the second exhaust hole 20304, and avoid chips from entering the second cavity 20303 through the second exhaust hole 20304, thereby avoiding the situation of blockage of the second cavity 20303 due to chip accumulation.

[0051] It is also considered that when using the end mill 7 to trim the side wall of the workpiece and the feed rate of the end mill 7 is large, at this time, the circumferential offset and jitter amplitude of the end mill 7 are relatively large, resulting in a large impact force on the shank of the end mill 7, so that the tool breakage phenomenon is likely to occur. Therefore, the second driving member 202 can be used to drive the baffle 203 to move downwards to the junction of the tool shank and the cutting edge, and the annular airbag 204 is used to clamp the shank of the end mill 7, so as to limit the circumferential offset and jitter amplitude of the tool shank during milling through the baffle 203, reduce the impact force borne by the shank of the end mill 7, thereby avoiding the situation of tool breakage of the end mill 7 due to the large circumferential offset and jitter amplitude, and reducing the loss caused by tool breakage.

[0052] On this basis, when the baffle 203 moves downward to the junction of the tool handle and the blade, at this time the baffle 203 is separated from the bottom of the sleeve 4001, resulting in the cutting fluid directly entering the sleeve 4001, affecting the use of the parts installed in the sleeve 4001. Therefore, by adding an annular mask 206 and a fixing ring 207 between the sleeve 4001 and the baffle 203, as Figure 9 shown, at this time the first limit block 20601 is clamped in the L-shaped slot 20702. When the second driving member 202 drives the baffle 203 to move downward, it synchronously drives the fixing ring 207, the rotating ring 20701, the L-shaped slot 20702 and the first limit block 20601 to move downward, so that the annular mask 206 is stretched. The annular mask 206, the fixing ring 207 and the baffle 203 jointly seal and protect the sleeve 4001 to prevent the chip fluid from affecting the use of the parts installed in the sleeve 4001. When it is necessary to remove the end mill 7 from the connecting plate 6, as Figure 10 shown, by controlling the first driving member 201 to drive the connecting plate 6 to move downward until it is separated from the sleeve 4001, and then taking the top-down view as the reference, the rotating ring 20701 is rotated counterclockwise, so that the first limit block 20601 is separated from the L-shaped slot 20702. At this time, the annular mask 206 can be manually moved upward so that the annular mask 206 retracts onto the sleeve 4001. At this time, the connection between the connecting plate 6 and the end mill 7 is exposed, and the staff can use a wrench to screw the end mill 7 off the connecting plate 6.

[0053] Embodiment 2

[0054] On the basis of Embodiment 1, referring to Figures 3 - 5 , Figure 8 and Figure 10 shown, it further includes a second limit block 301; two first limit slots 4003 that are symmetrically arranged front and back are provided on the connecting disk 4; a second limit block 301 is slidably connected in each first limit slot 4003; two second limit slots 5002 that are symmetrically arranged front and back are provided on each face mill 5; each second limit slot 5002 communicates with the adjacent first limit slot 4003; the contour of the second limit slot 5002 is consistent with the contour of the second limit block 301.

[0055] It further includes a third limit block 302; two convex blocks 7001 that are symmetrically arranged front and back are provided on the end mill 7; two third limit blocks 302 that are symmetrically arranged front and back are slidably connected to the bottom of the connecting plate 6 through springs; each third limit block 302 is clamped with the adjacent convex block 7001; the opposite sides of the two third limit blocks 302 are provided with extrusion parts 30201; the extrusion parts 30201 are provided with inclined surfaces, and the extrusion parts 30201 are slidably connected with the adjacent guide grooves 4002.

[0056] Considering the long-time vibration of the ultrasonic wavelength, it is easy to cause the loosening of the threads between the connecting plate 4 and the face milling cutter 5, and between the connecting plate 6 and the end milling cutter 7, resulting in a large amplitude of shaking of the face milling cutter 5 and the end milling cutter 7 during milling. To avoid the occurrence of the above problems, after the face milling cutter 5 is screwed in place on the connecting plate 4, the first limit card slot 4003 is aligned with the second limit card slot 5002. At this time, manually move the second limit block 301 downward to slide, so that the second limit block 301 is stuck between the first limit card slot 4003 and the second limit card slot 5002, thereby restricting the relative rotation between the connecting plate 4 and the face milling cutter 5 and avoiding the loosening of the threads between the connecting plate 4 and the face milling cutter 5. Further, after the end milling cutter 7 is screwed in place on the connecting plate 6, the third limit block 302 is opposite to the adjacent protruding block 7001, and at this time the extrusion part 30201 protrudes from the extrusion part 30201. Subsequently, control the first driving part 201 to drive the connecting plate 6 and the end milling cutter 7 to move upward, so that the guiding block 6001 is inserted into the guiding groove 4002. At the same time, the inclined surface of the extrusion part 30201 is squeezed by the guiding groove 4002, so that the third limit block 302 moves toward the side close to the protruding block 7001 until the extrusion part 30201 is completely inserted into the guiding groove 4002. At this time, the third limit block 302 is clamped with the corresponding protruding block 7001, thereby restricting the relative rotation between the connecting plate 6 and the end milling cutter 7 through the third limit block 302 and avoiding the loosening of the threads between the connecting plate 6 and the end milling cutter 7.

[0057] In summary, by restricting the relative rotation between the connecting plate 4 and the face milling cutter 5 through the second limit block 301 and restricting the relative rotation between the connecting plate 6 and the end milling cutter 7 through the third limit block 302, the installation stability of the face milling cutter 5 and the end milling cutter 7 is ensured in a long-time vibration environment, thereby avoiding large-amplitude shaking during milling caused by connection loosening and improving the milling quality.

[0058] Although the present invention has been described in detail with reference to the above embodiments, it is obvious to those skilled in the art through the present disclosure that various changes or modifications can be made to the present invention without departing from the principle and spirit scope of the present invention defined by the claims. Therefore, the detailed description of the embodiments of the present disclosure is only used to explain, rather than to limit the present invention, and the scope of protection is defined by the content of the claims.

Claims

1. An ultrasonic milling device, characterized in that: The invention comprises a milling platform (1) and a spindle (2); the milling platform (1) is provided with a spindle (2) which can move up and down, left and right, and forward and backward; the spindle (2) is provided with a cutting fluid nozzle; the invention also comprises an ultrasonic tool holder (3), a connecting plate (4), a face milling cutter (5), a connecting plate (6), an end milling cutter (7), a first driving member (201), and an auxiliary protection component; the spindle (2) is rotatably connected with a rotating shaft (2001); the ultrasonic tool holder (3) is clamped on the lower side of the rotating shaft (2001); an ultrasonic generating component (3001) is arranged in the ultrasonic tool holder (3); and high-frequency mechanical vibration is generated by the ultrasonic generating component (3001); A connecting plate (4) is fixedly connected to the lower side of the ultrasonic tool handle (3); a face milling cutter (5) is fixedly connected to the lower side of the connecting plate (4); a plurality of cutting teeth (5001) are arranged on the face milling cutter (5); a sleeve (4001) is fixedly connected to the lower side of the connecting plate (4); the sleeve (4001) passes through the middle of the face milling cutter (5); a first driving member (201) is fixedly connected inside the sleeve (4001); a connecting plate (6) is installed on the telescopic end of the first driving member (201); an end milling cutter (7) is fixedly connected to the lower side of the connecting plate (6); the end milling cutter (7) is located inside the sleeve (4001); and an auxiliary protection component for protecting the inside of the sleeve (4001) is installed inside the spindle (2).

2. An ultrasonic milling device according to claim 1, characterized in that: The auxiliary protection component comprises a baffle (203), an annular airbag (204) and a pneumatic slip ring (205); a baffle (203) is installed at the bottom of the sleeve (4001) to prevent cutting fluid from entering the sleeve (4001); the lowermost side of the baffle (203) is higher than the lowermost side of the cutting teeth (5001); a through hole is opened at the center of the baffle (203); an annular airbag (204) is installed at the through hole of the baffle (203); the annular airbag (204) is configured to adopt high temperature resistant silicone rubber; a pneumatic slip ring (205) is fixedly connected to the main shaft (2) ); the pneumatic slip ring (205) is divided into a stator and a rotor, the stator is connected to the main shaft (2), and the rotor is sleeved on the outside of the rotating shaft (2001); the stator and the rotor are rotationally connected; three air supply circuits (20501) are arranged between the stator and the rotor; the air inlet of each air supply circuit (20501) is connected to an external air pump; the air outlet of one of the air supply circuits (20501) is connected to the inside of the annular air bag (204) through an air supply hose, and the air supply hose passes through the ultrasonic knife handle (3), the connecting plate (4) and the sleeve (4001) in sequence.

3. An ultrasonic milling device according to claim 2, characterized in that: A first cavity (20301) arranged in an annular shape is provided in the baffle (203); a plurality of first exhaust holes (20302) are provided on the circumferential edge of the baffle (203); all the first exhaust holes (20302) are connected to the first cavity (20301); and the first exhaust holes (20302) are all inclined downward; and the first cavity (20301) is connected to one of the gas supply circuits (20501) via a gas supply hose.

4. An ultrasonic milling device according to claim 3, characterized in that: A second cavity (20303) arranged in an annular shape is provided in the baffle (203); a plurality of second exhaust holes (20304) arranged in an annular shape are provided at the bottom of the baffle (203); all the second exhaust holes (20304) are connected to the second cavity (20303); and the second cavity (20303) is connected to the remaining gas supply circuit (20501) via a gas supply hose.

5. An ultrasonic milling device according to claim 4, characterized in that: A guide block (20305) is arranged at the bottom of the baffle (203); the shape of the guide block (20305) is set to be an inverted cone.

6. An ultrasonic milling device according to claim 2, characterized in that: Two guide blocks (6001) are arranged on the connecting plate (6); and a guide groove (4002) corresponding to the shape of the guide blocks (6001) is opened on the inner wall of the sleeve (4001).

7. An ultrasonic milling device according to claim 6, characterized in that: The auxiliary protection component also includes a second driving member (202); the baffle (203) is arranged to be slidably connected to the sleeve (4001); a plurality of second driving members (202) are fixedly connected in the sleeve (4001); the telescopic ends of all the second driving members (202) are fixedly connected to the baffle (203); and the baffle (203) is driven to move up and down by the second driving member (202).

8. An ultrasonic milling device according to claim 7, characterized in that: The invention also comprises an annular shield (206) and a fixing ring (207); the annular shield (206) is fixedly connected to the bottom of the sleeve (4001); a plurality of first limit blocks (20601) are fixedly connected to the bottom of the annular shield (206); a fixing ring (207) is fixedly connected to the upper side of the fixing ring (207); a rotating ring (20701) is rotatably connected to the fixing ring (207); a plurality of L-shaped slots (20702) are provided on the rotating ring (20701); and each first limit block (20601) is located in an adjacent L-shaped slot (20702).

9. An ultrasonic milling device according to claim 2, characterized in that: It also includes a second limit card block (301); a plurality of first limit card slots (4003) are provided on the connection disk (4); a second limit card block (301) is slidably connected in each first limit card slot (4003); a plurality of second limit card slots (5002) are provided on each face milling cutter (5); each second limit card slot (5002) is connected to an adjacent first limit card slot (4003); and the contour of the second limit card slot (5002) is consistent with the contour of the second limit card block (301).

10. An ultrasonic milling device according to claim 6, characterized in that: The invention also comprises a third limit block (302); a plurality of protruding blocks (7001) are provided on the end mill (7); a plurality of third limit blocks (302) are slidably connected to the bottom of the connecting plate (6) via a spring; each third limit block (302) is engaged with an adjacent protruding block (7001); an extrusion portion (30201) is arranged on the opposite sides of the two third limit blocks (302); an inclined surface is arranged on the extrusion portion (30201), and the extrusion portion (30201) is slidably connected to an adjacent guide groove (4002).

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