Machining center main shaft non-stop manipulator-free automatic ultrasonic knife handle changing device

Abstract

A non-rotation manipulator-free automatic ultrasonic cutter handle changing device for a machining center spindle comprises the spindle, an ultrasonic cutter handle, a tool magazine, an air cylinder, a wireless electric energy transmitting and receiving device and a numerical control system. The tool magazine comprises a plurality of tool positions, a lead screw guide rail matched with linear motion and other moving parts. Each tool position comprises a tool clamp used for clamping a tool, a tool driving motor used for driving the tool to rotate, a tool circumferential position real-time detecting and adjusting system and a B meshing device meshed with the tool. According to the device for automatically replacing the ultrasonic cutter handle without rotation of the main shaft, the ultrasonic cutter on the main shaft of a machining center and the cutter in the tool magazine can be rapidly replaced under the condition that the main shaft does not rotate, the use efficiency of a numerical control machine tool is improved, and the machining cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of numerical control machining device, and particularly relates to a machining center main shaft non-stop rotation without mechanical hand automatic change ultrasonic tool handle device of machining center. BACKGROUND

[0002] The development and application of electric spindle, high-speed screw and linear motor greatly improve the cutting efficiency. In order to match the high efficiency of the machine tool, the high speed of automatic tool changer (ATC) as one of the important components of the machining center also becomes an important technical content of the high-speed machining center.

[0003] With the improvement of cutting speed and the continuous shortening of cutting time, the requirement for tool changing time is gradually improved, and the speed of tool changing has become an important index of high-level machining center. Ultrasonic vibration machining is another special machining technology after traditional machining technology, and has been widely used due to its good machining performance. However, it needs a power supply device to supply power, so it cannot use the traditional tool changing device. Due to its particularity, a new type of high-speed tool changing device is needed to match it.

[0004] The tool changing of the machine tool is usually carried out after the spindle stops rotating. However, it also needs a certain time from the stop of the machine tool spindle to the restart to reach the rated speed, which is actually a waste of time. In order to reduce or eliminate the auxiliary time required from the stop of the machine tool spindle to the restart to reach the rated speed, the present application provides a machining center main shaft non-stop rotation without mechanical hand automatic change ultrasonic tool handle device, which aims to reduce the machining auxiliary time and improve the utilization rate of the machine tool. SUMMARY

[0005] The present application provides a machining center main shaft non-stop rotation without mechanical hand automatic change ultrasonic tool handle device, which is used for tool changing of the numerical control center using ultrasonic tool handle, aims to reduce the tool changing time of cutting in numerical control machining, reduce the machining auxiliary time and improve the utilization rate of the machine tool.

[0006] The machining center main shaft non-stop rotation without mechanical hand automatic change ultrasonic tool handle device comprises a spindle, an ultrasonic tool handle, a tool magazine, a cylinder, a wireless electric energy transmission and reception device and a numerical control system.

[0007] The main shaft comprises a rotary driving device, an inner tapered hole coaxially connected with the tool holder, a clamping device for clamping the tool holder and transmitting torque, a gas pressure regulating device for fixing the pull pin of the tool holder, a speed regulating system for regulating the rotating speed of the main shaft, a real-time detection and adjustment system for the circumferential position of the main shaft; the ultrasonic tool holder comprises an outer tapered handle coaxially connected with the main shaft, a tool body arranged below the outer tapered handle, a bearing sleeved on the tool body, a groove sleeved on the outer ring of the bearing for being clamped by the tool holder, an A meshing device and a tool, and a wireless power receiving device mounted on the tool body; the outer tapered handle is arranged at the uppermost end of the tool holder, the groove, the bearing, the A meshing device and the wireless power receiving device are sequentially arranged in the middle part of the tool body, and the tool is arranged at the lower end of the tool body.

[0008] The tool magazine comprises a plurality of tool positions and a tool position changing device, each tool position comprises a tool holder for clamping the tool, a tool driving motor for driving the tool to rotate, a real-time detection and adjustment system for the circumferential position of the tool, and a B meshing device for engaging with the tool; the tool position changing device is used to change the tool position according to the machining program; the tool holder clamps the tool through the groove bearing on the tool holder; the tool driving motor is connected with the B meshing device, and when the tool needs to reach a predetermined rotating speed, the tool driving motor drives the B meshing device to rotate; when the tool is loaded into the tool position, the B meshing device in the tool position engages with the A meshing device on the tool holder.

[0009] The cylinder comprises a high-pressure air inlet pipe, an outer shell, a one-way valve and a piston push rod. The piston push rod is coaxially connected with the outer shell, and the high-pressure air inlet pipe is connected to the tail of the cavity. When the piston push rod needs to move, high-pressure air is injected to push the piston push rod to move, and when the piston push rod needs to recover, the one-way valve is used to release pressure to balance the pressure inside and outside the cavity.

[0010] The wireless power transmission and reception device comprises a wireless power transmission device and a wireless power receiving device. The wireless power transmission device is installed at the lower end of the main shaft and connected with the wireless power receiving device on the ultrasonic tool holder through a component. An external power supply supplies power to the wireless power transmission device, and the two are connected through a magnetic field to transmit power. The wireless power receiving device supplies power to the ultrasonic tool holder to make it vibrate at high frequency. The vertical plate of the wireless power transmission device is connected with the original edge, and the whole is connected with the piston push rod of the cylinder and keeps parallel.

[0011] The numerical control system is connected with the speed regulating system, the real-time detection and adjustment system, the main shaft driving device of the main shaft, and the tool driving motor, the real-time detection and adjustment system for the circumferential position of the tool, and the tool position changing device in the tool position of the tool magazine through cables for communication.

[0012] The outer ring of the bearing, the groove for being clamped by the tool holder, and the tool holder shell are made into an integrated structure as a whole.

[0013] The cylinder provides a reasonable path for the ultrasonic tool holder to unload and load the tool by pushing the original edge away in advance during the tool changing process.

[0014] Further, the real-time detection and adjustment system of the circumferential position of the main shaft and the tool magazine monitors the circumferential position of the tool on the main shaft and the B meshing device in the tool position of the tool magazine in real time, and keeps the circumferential position of the tool on the main shaft consistent with the circumferential position of the B meshing device in the tool position of the tool magazine during tool changing.

[0015] Further, the rotation speed of the main shaft is between 0-200000 rpm.

[0016] Further, the tool driving motor driving the rotation of the tool in the tool magazine can drive the tool to rotate at a speed of 0-200000 rpm.

[0017] Further, the main shaft is provided with a stall alarm and system processing suspension device.

[0018] Further, the tool driving motor driving the rotation of the tool in the tool magazine is provided with a stall alarm and system processing suspension device.

[0019] Further, the meshing pair of the A meshing device and the B meshing device is a gear pair, a worm gear, or a rubber wheel pair.

[0020] The application provides a machining center main shaft non-stop rotation without mechanical hand automatic changing of ultrasonic tool handle device, realizes that the main shaft is always in a rotating state, the tool on the main shaft is returned to the empty tool position in the tool magazine, and then another tool in the tool magazine is installed into the main shaft, avoids the process that the rotation speed of the main shaft is reduced from high speed to stop, and then restarted to rotate after the tool is installed in the traditional tool changing device, and a new design is made for the ultrasonic tool handle with a wireless power transmission and receiving device, a pushing mechanism is added to realize a reasonable path of high-speed tool changing of the ultrasonic tool handle. The tool changing time between cutting and cutting is saved, the machining auxiliary time is effectively reduced, the effective working time of the machine tool and the equipment utilization rate are improved, the production cost is reduced, and the application prospect is wide. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the machining center main shaft non-stop rotation without mechanical hand automatic tool changing device according to the application;

[0022] Figure 2 is a structural schematic diagram of the main shaft in the embodiment;

[0023] Figure 3 is a structural schematic diagram of the ultrasonic tool handle in the embodiment;

[0024] Figure 4 is a structural schematic diagram of the tool magazine in the embodiment;

[0025] Figure 5is the schematic diagram of the cylinder structure described in the embodiment;

[0026] Figure 6 is the schematic diagram of the wireless power transmission device structure described in the embodiment;

[0027] Figure 7 is the schematic diagram of the unloading process of the automatic tool changing device without mechanical hand of the machining center spindle without stopping rotation;

[0028] Figure 8 is the schematic diagram of the loading process of the automatic tool changing device without mechanical hand of the machining center spindle without stopping rotation;

[0029] Explanation of figure marks:

[0030] 1. Spindle, 2. Ultrasonic tool shank, 3. Tool magazine, 4. Cylinder, 5. Wireless power transmission device;

[0031] 101. Spindle rotation driving device, 102. Inner tapered hole;

[0032] 201. Pull pin, 202. Outer tapered handle, 203. Groove, 204. Bearing, 205. Tool body, 206. A meshing device, 207. Tool, 208. Wireless power receiving device;

[0033] 301. Tool position, 302. Tool position changing device, 303. Tool holder, 304. Tool driving motor, 305. B meshing device;

[0034] 401. Optical axis, 402. Piston push rod, 403. Cylinder shell, 404. Air inlet;

[0035] 501. Fixed part, 502. Vertical plate, 503. Power supply primary side. DETAILED DESCRIPTION

[0036] The automatic tool changing device without mechanical hand of the machining center spindle without stopping rotation is further described in detail below in combination with the drawings and specific embodiments. It should be noted that the drawings are very simplified and non-precise ratios are used, only for the purpose of facilitating and clarifying the purpose of assisting in the description of the embodiments of the present application.

[0037] The automatic tool changing device without mechanical hand of the machining center spindle without stopping rotation is characterized by comprising a spindle 1, an ultrasonic tool shank 2, a tool magazine 3, a cylinder 4, a wireless power transmission device 5 and a numerical control system.

[0038] The spindle 1 comprises a spindle rotation driving device 101 in the middle, an inner tapered hole 102 coaxially connected with the tool shank 2, a speed regulation system for adjusting the rotation speed of the spindle, a real-time detection and adjustment system for the circumferential position of the spindle.

[0039] The ultrasonic knife handle 2 comprises a pull pin 201, an outer taper handle 202 coaxially connected with the main shaft 1, a knife body 205 arranged below the outer taper handle 202, a bearing 204 sleeved on the knife body 205, a groove 203 sleeved on the bearing 204 for being clamped by the knife clamp 303, an A meshing device 206, a wireless power receiving device 208 for receiving electric energy, and a cutter 207, the bearing 204 on the knife body 205 adopts an NN3005 high-speed bearing, the bearing 204 is made of GCr4, the inner diameter r is 25, the R is 47, and the tooth surface is in the form of an inverted trapezoid.

[0040] The tool magazine 3 comprises 12 tool positions 301 and a tool position changing device 302, each tool position 301 comprises a knife clamp 303 for clamping a cutter, a cutter driving motor 304 for driving the cutter to rotate, a real-time detection and adjustment system for the circumferential position of the cutter, and a B meshing device 305 meshing with the cutter, the meshing pair of the A meshing device 206 and the B meshing device 305 is a gear pair, the gear parameters are m=0.8, z=40, and α=20°, Ha ＊ =1, Hc*=0.25, the tooth thickness h is 4 mm, the accuracy level is 5, and the cutter driving motor 304 is an HF-102K servo motor.

[0041] The cylinder 4 comprises four light shafts 401 connected with the shell to provide stable linear motion, a piston push rod 402 is coaxially arranged with the shell 403, and a high-pressure air injection hole 404 injects high-pressure air to drive the piston rod 402 to provide power.

[0042] The wireless power transmission device 5 comprises a wireless power transmission device 503 and a wireless power receiving device 208, the wireless power transmission device 503 is arranged at the lower end of the main shaft 1 and is connected with the wireless power receiving device 208 on the ultrasonic knife handle 2 through a vertical plate 502; an external power supply is arranged to supply power to the wireless power transmission device, the two are connected through a magnetic field to transmit electric energy, the wireless power receiving device supplies power to the ultrasonic knife handle to make it vibrate at a high frequency; the vertical plate 502 of the wireless power transmission device is connected with the primary side 503, and the whole is connected with the cylinder piston push rod 402 and keeps parallelism.

[0043] The numerical control system is connected with the speed regulation system of the main shaft, the real-time detection and adjustment system, the main shaft driving device, the cutter driving motor 304 in the tool position 301 of the tool magazine, the real-time detection and adjustment system for the circumferential position of the cutter, and the tool position changing device 302.

[0044] The automatic tool changing device without mechanical hand of the machining center main shaft rotating continuously is changed according to the following steps:

[0045] (1) the cutter on the main shaft 1 is put back into the empty tool position 301 in the tool magazine 3 (tool unloading);

[0046] ①After the tool on the main shaft 1 completes a work step, it still maintains a certain rotating speed, and the main shaft 1 and the tool return to the tool changing point together. The tool position changing device 302 in the tool magazine 3 changes the empty tool position 301 to be unloaded to the tool changing point in advance, and starts the motor 304 driving the tool to rotate before the main shaft reaches the tool changing point, drives the B meshing device 305 meshing with the tool to reach the same rotating speed as the main shaft 1 and the tool, and the tool holder 303 of the tool magazine 3 and the groove 203 on the tool shank 2 maintain the same height alignment state, the A meshing device 206 on the tool shank 2 and the B meshing device 305 in the tool magazine 3 also maintain the alignment state at this time, and the circumferential positions of the tool and the main shaft 1 and the B meshing device 305 in the tool magazine 3 are ensured to be consistent through the real-time detection and adjustment system of the numerical control system and the circumferential positions of the main shaft 1 and the tool position 301 in the tool magazine;

[0047] ②The tool magazine 3 drives the empty tool position 301 to move towards the tool on the main shaft 1, the tool holder 303 clamps the groove 203 on the tool shank 2, and the B meshing device 305 in the tool position 301 meshes with the A meshing device 206 on the tool shank 2, at this time, the main shaft 1, the A meshing device 206 on the tool shank 2 and the B meshing device 305 in the tool position 301 maintain the same rotating speed, the cylinder 4 injects high-pressure air into the air inlet 404 in advance to drive the piston rod 402 to move and push away the power supply original side;

[0048] ③The main shaft 1 is lifted up to the upper side of the tool position 301, the taper shaft cooperating with the main shaft 1 and the ultrasonic tool shank 2 is separated, the tool is unloaded, and the tool is put back into the tool position 301 of the tool magazine 3, the rotating speed of the unloaded tool is jointly controlled by the tool driving motor 304 driving the tool to rotate, the real-time detection and adjustment system of the circumferential position of the tool and the numerical control system, so that the rotating speed is reduced to zero, that is, the tool is detached from the main shaft 1.

[0049] (2) Another tool in the tool magazine 3 is loaded into the main shaft 1 (tool loading);

[0050] ①After the main shaft 1 is lifted up to the upper side of the tool position 301, the tool to be loaded into the main shaft 1 and the tool position 301 are started to rotate to the rotating speed set for the next work step in advance, and the circumferential positions of the main shaft 1 and the tool in the tool magazine 3 are ensured to be consistent through the real-time detection and adjustment system of the numerical control system and the circumferential positions of the main shaft 1 and the tool magazine 3, and the rotating speed of the main shaft 1 is adjusted to be consistent with the rotating speed of the tool; the tool to be loaded into the main shaft 1 and the tool position 301 are moved to the lower side of the main shaft 1 through the tool position changing device 302;

[0051] ②The main shaft 1 moves downward, so that the inner taper hole 102 of the main shaft 1 and the outer taper shaft 202 of the tool cooperate, the main shaft 1 and the tool rotate at the same circumferential position and the same rotating speed, the cylinder 4 starts to release pressure through the one-way valve, the piston rod 402 moves reversely, and the power supply original side returns to the power supply position to supply power for the ultrasonic tool shank;

[0052] III. The tool magazine 3 is withdrawn backward, the tool holder 303 is separated from the tool, the A engagement device 206 on the ultrasonic tool shank 2 is separated from the B engagement device 305 in the tool magazine 3, that is, the installation of the tool to the spindle 1 is realized. After the tool is installed, the spindle 1 can drive the tool to process the next step.

[0053] After the above-mentioned experiment of the non-mechanical hand numerical control machining center spindle without stopping conversion, the tool changing time from cutting to cutting is reduced from the previous spindle 1 stopping conversion tool changing time of 6.2 seconds to the present spindle 1 without stopping conversion tool changing time of 4.3 seconds, and the tool changing time is reduced by nearly 30%.

Claims

1. A device for automatic changing of ultrasonic tool shank without mechanical hand in machining center spindle without stopping, characterized in that The application relates to a main shaft, an ultrasonic knife handle, a knife library, a cylinder, a wireless power transmission and receiving device and a numerical control system. The main shaft comprises a rotary driving device, an inner taper hole coaxially connected with the knife handle, a clamping device for clamping the knife handle and transmitting torque, a gas pressure regulating device for fixing a pull pin of the knife handle, a speed regulating system for regulating the rotating speed of the main shaft, and a real-time detection and adjustment system for the circumferential position of the main shaft. The ultrasonic knife handle comprises an outer taper handle coaxially connected with the main shaft, a knife body arranged below the outer taper handle, a bearing sleeved on the knife body, a groove for being clamped by a knife clamp, an A meshing device and a tool installed on the knife body; the outer taper handle is arranged at the uppermost end of the knife handle; the groove, the bearing, the A meshing device and the wireless power receiving device are sequentially arranged in the middle part of the knife body; and the tool is arranged at the lower end of the knife body. The knife library comprises a plurality of knife positions and a knife position changing device; each knife position comprises a knife clamp for clamping the tool, a tool driving motor for driving the tool to rotate, a real-time detection and adjustment system for the circumferential position of the tool, and a B meshing device for meshing with the tool; the knife position changing device is used for changing the knife position according to the machining program; the knife clamp clamps the tool through the groove bearing on the knife handle; the tool driving motor is connected with the B meshing device; when the tool needs to reach a predetermined rotating speed, the tool driving motor drives the B meshing device to rotate; after the tool is installed in the knife position, the B meshing device in the knife position is meshed with the A meshing device on the knife handle. The cylinder comprises a high-pressure air inlet pipe, an outer shell, a one-way valve and a piston push rod; the piston push rod is coaxially connected with the outer shell; the high-pressure air inlet pipe is connected to the tail part of the cavity; when the piston push rod needs to move, high-pressure air is injected to push the piston push rod to move; when the piston push rod needs to recover, the one-way valve is used for pressure relief to balance the pressure inside and outside the cavity. The wireless power transmission and receiving device comprises a wireless power transmission device and a wireless power receiving device; the wireless power transmission device is installed at the lower end of the main shaft and connected with the wireless power receiving device on the ultrasonic knife handle through a component; an external power supply is used for supplying power for the wireless power transmission device; the two are connected through a magnetic field to transmit power; and the wireless power receiving device supplies power for the ultrasonic knife handle to make it vibrate at a high frequency. The numerical control system is connected with the speed regulating system, the real-time detection and adjustment system, the main shaft driving device of the main shaft, and the tool driving motor, the real-time detection and adjustment system for the circumferential position of the tool, and the knife position changing device in the knife position of the knife library through a cable to realize communication.

2. The automatic ultrasonic tool holder changing device without mechanical hand and without stopping the spindle of the machining center according to claim 1, characterized in that, The outer ring of the bearing sleeved on the ultrasonic knife handle, the groove for being clamped by the knife clamp and the ultrasonic knife handle shell are integrally formed into an integrated structure.

3. The automatic ultrasonic tool holder changing device without mechanical hand and with non-stop rotation of the spindle of the machining center according to claim 1, characterized in that, The real-time detection and adjustment systems for the circumferential positions of the main shaft and the knife library monitor the circumferential positions of the tool on the main shaft and the B meshing device in the knife position of the knife library in real time; and the circumferential positions of the tool on the main shaft and the B meshing device in the knife position of the knife library are consistent when the tool is changed.

4. The automatic ultrasonic tool holder changing device without mechanical hand and without stopping the spindle of the machining center according to claim 1, characterized in that, The vertical plate of the wireless power transmission device is connected with the original side; the whole is connected with the piston push rod of the cylinder and keeps parallelism.

5. The automatic ultrasonic tool holder changing device without mechanical hand and without stopping the spindle of the machining center according to any one of claims 1-4, characterized in that, The rotating speed of the main shaft is between 0 and 200000 rpm.

6. The automatic ultrasonic tool holder changing device without mechanical hand and without stopping the spindle of the machining center according to any one of claims 1-4, characterized in that, The tool driving motor for driving the tool to rotate in the knife library can drive the tool to rotate at a speed between 0 and 200000 rpm.

7. The automatic changing device of the ultrasonic tool shank without mechanical hand and with non-stop rotation of the spindle of the machining center according to claim 1, characterized in that, The main shaft is provided with stall alarm and system processing suspension device.

8. The automatic ultrasonic tool holder changing device without mechanical hand and without stopping the spindle of the machining center according to claim 1, characterized in that, The tool driving motor for driving the tool to rotate in the tool magazine is provided with stall alarm and system processing suspension device.

9. The automatic changing device of the ultrasonic tool shank without mechanical hand and with non-stop rotation of the spindle of the machining center according to claim 1, characterized in that, The engaging pairs of the A engaging device and the B engaging device are gear pairs, turbine worm gears or rubber wheel pairs.

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