Ultrasonic machining cutter handle assembly capable of safely changing cutter

Abstract

The utility model discloses an ultrasonic machining cutter handle assembly capable of safely changing a cutter, which comprises a machine tool spindle and a cutter handle main body detachably connected with the machine tool spindle, and is characterized in that an annular transmitting end coil is matched with an annular receiving end coil, and electric energy is transmitted through an electromagnetic induction principle; wireless power supply of an ultrasonic transducer of a knife handle body can be achieved, wireless power supply and power supply are more convenient, an annular transmitting end coil is arranged on the outer ring of an annular receiving end coil, a first conical surface with the diameter gradually reduced from bottom to top is arranged on the outer ring of a coil mounting part, and a second conical surface is arranged in a main shaft mounting cavity; due to the existence of the first conical surface and the second conical surface, the diameter of the top of the coil mounting part is smaller, and the bottom opening of the main shaft mounting cavity is larger, so that the coil mounting part can extend into the main shaft mounting cavity conveniently, and damage to the annular transmitting end coil and the annular receiving end coil caused by collision contact during mounting is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of machining, and in particular to the technical field of ultrasonic machining tool holder assemblies that allow for safe tool replacement. Background Technology

[0002] The rapid development of technology has led to an increasing complexity in industrial products, posing more stringent challenges to the precision and efficiency of machining technologies. Traditional machine tools are becoming increasingly limited in their ability to handle special materials and complex shapes. For example, machining high-hardness materials requires significant cutting forces, often resulting in rapid tool wear; while brittle materials are prone to cracking or even breakage during machining due to uneven stress.

[0003] In this context, ultrasonic technology has begun to demonstrate its unique advantages in the machining field. By utilizing the energy of ultrasonic vibrations, it effectively reduces cutting forces, extends tool life, and significantly improves machining quality. In particular, ultrasonic technology has shown remarkable capabilities in machining hard and brittle materials, achieving machining results that are both highly precise and low-damage.

[0004] The development of multi-axis machining technology has made it possible to process workpieces with complex shapes. Multi-axis machine tools can process workpieces from multiple angles, greatly improving processing flexibility and accuracy. Combining ultrasonic technology with multi-axis machining technology has given rise to ultrasonic multi-axis machining tools.

[0005] This new type of machine tool has shown great promise in high-end manufacturing fields such as aerospace, medical devices, and electronics. It can meet the extremely high requirements of these fields for precision components, providing strong technical support for promoting the development of manufacturing towards high-end and intelligent directions.

[0006] Ultrasonic tool holders require the integration of ultrasonic transducers within their internal components. However, the rotation of the ultrasonic tool holder during operation presents a challenge in powering the internal ultrasonic transducer. Conventional methods using conductive slip rings to connect ultrasonic tool holders result in excessive overall length, which can lead to excessive load on the spindle bearings during machining, potentially causing spindle damage and affecting its lifespan. Furthermore, the excessive overall mass increases wear on the spindle and may adversely affect the stability of the machine tool during high-speed operation.

[0007] The welding wiring of transducers and amplitude transformers is mostly externally welded, which cannot fully utilize the internal space of the tool holder, hindering the overall shortening design of the tool holder and affecting the compactness of the overall structure. Furthermore, this method significantly increases the length of the tool holder, affecting dynamic balance during high-speed rotation.

[0008] Some ultrasonic wireless transmission tool holders use an ultrasonic transmission method with two loop coils, one inner and one outer, as shown in the attached diagram of the instruction manual. Figure 9 As shown, the outer coil is the ultrasonic power transmitter, fixed on the machine tool spindle; the inner coil is the ultrasonic power receiver, mounted on the tool holder. However, since the distance between the two coils is generally very small, about 0.7mm, the automatic tool changing accuracy of the tool holder is required to be high. If the tool holder tilts slightly or moves laterally or backward during tool changing, the two coils may collide, causing damage to the ultrasonic machining tool holder and spindle. Summary of the Invention

[0009] The purpose of this invention is to solve the problems in the prior art and propose an ultrasonic machining tool holder assembly that can safely change tools. It can power the ultrasonic transducer inside the tool holder body through wireless power supply, and facilitate automatic tool changing on the machine tool. During the automatic tool changing process, it can avoid damage to the tool holder caused by the coils colliding with each other.

[0010] To achieve the above objectives, this utility model proposes an ultrasonic machining tool holder assembly with safe tool changing capability, comprising a machine tool spindle and a tool holder body detachably connected to the machine tool spindle. The tool holder body is provided with a tool mounting part for mounting a tool. The machine tool spindle is provided with a spindle mounting cavity. The tool holder body is provided with a tool holder connecting part adapted to the spindle mounting cavity. The tool holder connecting part is provided with a coil mounting part. An annular receiving coil is provided inside the coil mounting part. An annular transmitting coil adapted to the annular receiving coil is provided on the spindle mounting cavity. When the tool holder connecting part is connected to the spindle mounting cavity, the annular transmitting coil is located on the outer ring of the annular receiving coil. The outer ring of the coil mounting part is provided with a first conical surface whose diameter gradually decreases from bottom to top. A second conical surface adapted to the first conical surface is provided inside the spindle mounting cavity. An ultrasonic transducer electrically connected to the annular receiving coil is provided inside the tool holder body.

[0011] Preferably, the machine tool spindle includes a rotating shaft and a spindle housing disposed outside the rotating shaft. The rotating shaft is rotatably disposed inside the spindle housing. The spindle mounting cavity includes a first mounting cavity disposed on the rotating shaft and a second mounting cavity disposed on the spindle housing. The tool holder connecting part is detachably connected to the first mounting cavity. The annular transmitting coil is disposed on the spindle housing and surrounds the second mounting cavity.

[0012] Preferably, the coil mounting portion is an annular shape protruding from the side wall of the tool holder connecting portion, and the second mounting cavity is adapted to the tool holder connecting portion.

[0013] Preferably, the coil mounting part is provided with a first annular mounting groove, the annular receiving coil is disposed in the first annular mounting groove, the main shaft housing is provided with a second annular mounting groove, and the annular transmitting coil is disposed in the second annular mounting groove.

[0014] Preferably, the spindle housing includes an upper housing and a lower housing located below the upper housing. The upper housing and the lower housing are detachably connected, and a groove is provided between the upper housing and the lower housing for the power line of the annular transmitting coil to pass through.

[0015] Preferably, the lower housing is provided with a nozzle mounting seat, the nozzle mounting seat is provided with a plurality of nozzle mounting interfaces, and the nozzle mounting seat is provided with a flow channel communicating with the nozzle mounting interfaces.

[0016] Preferably, the tool mounting part is a heat-fit tool holder, which is provided with a heat-shrinkable tool that can be detachably connected to it.

[0017] Preferably, a transmitting magnet is provided next to the annular transmitting coil, and a receiving magnet is provided next to the annular receiving coil. Both the transmitting magnet and the receiving magnet are ferrite soft magnetic cores.

[0018] Preferably, the annular receiving coil and the annular transmitting coil are conical coils corresponding to the first conical surface and the second conical surface.

[0019] The beneficial effects of this utility model of an ultrasonic machining tool holder assembly with safe tool changing are as follows: This utility model, by setting up a ring-shaped transmitting coil and a ring-shaped receiving coil to cooperate, transmits electrical energy through the principle of electromagnetic induction, realizing wireless power supply to the ultrasonic transducer of the tool holder body. Wireless power supply is more convenient. The ring-shaped transmitting coil is set on the outer ring of the ring-shaped receiving coil, and the outer ring of the coil mounting part is set with a first conical surface with a gradually decreasing diameter from bottom to top, and a second conical surface is set inside the spindle mounting cavity. When changing the tool holder body, due to the presence of the first and second conical surfaces, the top diameter of the coil mounting part is small, while the bottom opening of the spindle mounting cavity is large, which makes it easy for the coil mounting part to extend into the spindle mounting cavity. It avoids collision contact during installation that could damage the ring-shaped transmitting coil and the ring-shaped receiving coil, and facilitates automatic tool changing of the machine tool. During the automatic tool changing process, it can avoid the coils colliding with each other and causing damage to the tool holder.

[0020] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of an ultrasonic machining tool holder assembly that allows for safe tool replacement, according to this utility model.

[0022] Figure 2 This is a front cross-sectional view of an ultrasonic machining tool holder assembly that allows for safe tool replacement, according to this utility model.

[0023] Figure 3 yes Figure 2 A magnified structural diagram of the middle section.

[0024] Figure 4 This is a three-dimensional structural diagram of the main body of the knife handle.

[0025] Figure 5 This is a schematic diagram of the main structure of the knife handle.

[0026] Figure 6 This is a schematic diagram of the upper three-dimensional structure of the main body of the knife handle.

[0027] Figure 7 This is a three-dimensional structural diagram of a machine tool spindle.

[0028] Figure 8 This is a schematic diagram of the three-dimensional structure of the lower shell.

[0029] Figure 9 This is a schematic diagram of the background technology.

[0030] in:

[0031] 1-Machine tool spindle; 2-Tool holder body; 3-Annular receiving coil; 4-Annular transmitting coil; 5-Ultrasonic transducer; 11-Spindle mounting cavity; 12-Rotating shaft; 13-Spindle housing; 21-Tool holder connecting part; 22-Coil mounting part; 111-Second conical surface; 112-First mounting cavity; 113-Second mounting cavity; 131-Upper housing; 132-Lower housing; 133-Wire groove; 134-Second annular mounting groove; 221-First conical surface; 222-First annular mounting groove; 1321-Nozzle mounting seat; 1322-Nozzle mounting interface. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0033] In the description of this utility model, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.

[0034] In the description of this utility model, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0035] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example 1:

[0036] See Figures 1-8This utility model discloses an ultrasonic machining tool holder assembly with safe tool changing capability, comprising a machine tool spindle 1 and a tool holder body 2 detachably connected to the machine tool spindle 1. The tool holder body 2 is provided with a tool mounting part for mounting a tool. The machine tool spindle 1 is provided with a spindle mounting cavity 11. The tool holder body 2 is provided with a tool holder connecting part 21 adapted to the spindle mounting cavity 11. The tool holder connecting part 21 is provided with a coil mounting part 22, and the coil mounting part 22 is provided with a ring-shaped receiving coil 3. The spindle mounting cavity 1... The tool holder 21 is provided with an annular transmitting coil 4 adapted to the annular receiving coil 3. When the tool holder connecting part 21 is connected to the spindle mounting cavity 11, the annular transmitting coil 4 is located on the outer ring of the annular receiving coil 3. The outer ring of the coil mounting part 22 is provided with a first conical surface 221 whose diameter gradually decreases from bottom to top. The spindle mounting cavity 11 is provided with a second conical surface 111 adapted to the first conical surface 221. The tool holder body 2 is provided with an ultrasonic transducer 5 electrically connected to the annular receiving coil 3. In this embodiment, by setting up an annular transmitting coil 4 and an annular receiving coil 3 to cooperate, electrical energy is transmitted through the principle of electromagnetic induction, which can realize wireless power supply to the ultrasonic transducer 5 of the tool holder body 2. Wireless power supply is more convenient. The annular transmitting coil 4 is set on the outer ring of the annular receiving coil 3, and the outer ring of the coil mounting part 22 is provided with a first conical surface 221 with a gradually decreasing diameter from bottom to top, and a second conical surface 111 is provided in the spindle mounting cavity 11. When the tool holder body 2 is replaced, the presence of the first conical surface 221 and the second conical surface 111 makes the top diameter of the coil mounting part 22 smaller, while the bottom opening of the spindle mounting cavity 11 is larger, which makes it easier for the coil mounting part 22 to extend into the spindle mounting cavity 11, avoiding collision and contact during installation that could damage the annular transmitting coil 4 and the annular receiving coil 3.

[0037] See Figure 2 , Figure 7 , Figure 8 The machine tool spindle 1 includes a rotating shaft 12 and a spindle housing 13 disposed outside the rotating shaft 12. The rotating shaft 12 is rotatably disposed within the spindle housing 13. The spindle mounting cavity 11 includes a first mounting cavity 112 disposed on the rotating shaft 12 and a second mounting cavity 113 disposed on the spindle housing 13. The tool holder connecting part 21 is detachably connected to the first mounting cavity 112. The annular transmitting coil 4 is disposed on the spindle housing 13 and surrounds the second mounting cavity 113. The rotating shaft 12 is used to drive the tool holder body 2 to rotate, and the spindle housing 13 is used to protect and fix the rotating shaft 12. During rotation, the annular receiving coil 3 rotates synchronously, while the annular transmitting coil 4 remains stationary, facilitating the connection of the annular transmitting coil 4 to a power source.

[0038] See Figure 5 , Figure 6 , Figure 7 The coil mounting portion 22 is an annular shape protruding from the side wall of the handle connecting portion 21, and the second mounting cavity 113 is adapted to the handle connecting portion 21. This facilitates the installation of the annular receiving coil 3 and also cooperates with the second mounting cavity 113 to provide positioning and limiting functions.

[0039] See Figure 3 The coil mounting part 22 is provided with a first annular mounting groove 222, and the annular receiving coil 3 is disposed in the first annular mounting groove 222. The main shaft housing 13 is provided with a second annular mounting groove 134, and the annular transmitting coil 4 is disposed in the second annular mounting groove 134. The opening of the annular mounting groove is sealed with adhesive to prevent water ingress.

[0040] Preferably, a transmitting magnet is provided next to the annular transmitting coil 4 in the second annular mounting groove 134, and a receiving magnet is provided next to the annular receiving coil 3 in the first annular mounting groove 222. Both the transmitting magnet and the receiving magnet are ferrite soft magnetic cores. The magnets can increase the magnetic inductance and enhance the transmitted signal.

[0041] See Figure 2 , Figure 8 The spindle housing 13 includes an upper housing 131 and a lower housing 132 located below the upper housing 131. The upper housing 131 and the lower housing 132 are detachably connected. A groove 133 is provided between the upper housing 131 and the lower housing 132 for the power line of the annular transmitting coil 4 to pass through. The power line of the annular transmitting coil 4 can be led out through the groove 133 and connected to an external power supply.

[0042] See Figure 1 The lower housing 132 is provided with a nozzle mounting seat 1321, which has a plurality of nozzle mounting interfaces 1322. The nozzle mounting seat 1321 has a flow channel communicating with the nozzle mounting interfaces 1322. The nozzle mounting interfaces 1322 can be used to mount bamboo-joint nozzles for spraying coolant onto cutting tools.

[0043] See Figure 3 The annular receiving coil 3 and the annular transmitting coil 4 are conical coils corresponding to the first conical surface 221 and the second conical surface 111, respectively. The diameter of the conical coil gradually decreases from bottom to top, and the inclination of the conical coil is the same as that of the first conical surface 221 and the second conical surface 111. Compared with a cylindrical coil of the same height and the same top diameter, the conical coil has a larger surface area, thus increasing the induction area between the transmitting and receiving coils, increasing the magnetic flux, and improving the transmission efficiency. Example 2:

[0044] See Figure 6 , Figure 7 Based on Embodiment 1, the tool mounting part is a thermostatic tool holder, on which a heat-shrinkable tool is detachably connected. When machining metal parts, to effectively prevent tool loosening and detachment and improve tool machining stability, the tool clamping method is designed as a heat-shrink clamping mechanism. Utilizing the difference in thermal expansion coefficients between the tool holder and the tool, the tool is clamped forcefully and with high precision. When clamping the tool, the tool holder is first heated to a specific temperature, at which point the tool mounting part expands. The tool is then inserted, and as the tool holder temperature decreases, the mounting interface shrinks, thereby clamping the tool. Through this mounting method, the clamping force of the tool holder can be significantly increased. When performing hard cutting on metal materials, it can effectively prevent the tool from loosening or detaching under the simultaneous action of high ultrasonic vibration power and large cutting force, effectively ensuring the stability and safety of the machining process.

[0045] The working process of this utility model:

[0046] This utility model discloses an ultrasonic machining tool holder assembly with safe tool replacement. During operation, the tool is installed on the tool mounting part of the tool holder body 2, and the tool holder body 2 is fixed on the spindle mounting cavity 11 of the machine tool spindle 1. The annular transmitting coil 4 and the annular receiving coil 3 transmit electrical energy through the principle of electromagnetic induction. The cooperation between the annular transmitting coil 4 and the annular receiving coil 3 supplies power to the ultrasonic transducer 5 and realizes the control of the ultrasonic transducer 5. The ultrasonic transducer 5 and the amplitude transformer transmit ultrasonic waves to the tool on the tool holder body 2 to realize ultrasonic cutting.

[0047] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The internal components of the electric slide rail, cylinder, welding machine, electric telescopic rod and controller all adopt conventional models in the existing technology, and their internal structure belongs to the existing technology structure. Workers can complete the normal operation of them according to the existing technical manual. In addition, the circuit connection adopts the conventional connection method in the existing technology, and will not be described in detail here.

[0048] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection for this utility model. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of this utility model, or equivalent structural or procedural transformations made using the content of this utility model's specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of protection of this utility model patent.

Claims

1. An ultrasonic machining tool holder assembly with safe tool changing capability, comprising a machine tool spindle (1) and a tool holder body (2) detachably connected to the machine tool spindle (1), wherein the tool holder body (2) is provided with a tool mounting portion for mounting a tool, characterized in that: The machine tool spindle (1) is provided with a spindle mounting cavity (11), the tool holder body (2) is provided with a tool holder connecting part (21) adapted to the spindle mounting cavity (11), the tool holder connecting part (21) is provided with a coil mounting part (22), the coil mounting part (22) is provided with an annular receiving coil (3), the spindle mounting cavity (11) is provided with an annular transmitting coil (4) adapted to the annular receiving coil (3), when the tool holder connecting part (21) is connected to the spindle mounting cavity (11), the annular transmitting coil (4) is located on the outer ring of the annular receiving coil (3), the outer ring of the coil mounting part (22) is provided with a first conical surface (221) whose diameter gradually decreases from bottom to top, the spindle mounting cavity (11) is provided with a second conical surface (111) adapted to the first conical surface (221), and the tool holder body (2) is provided with an ultrasonic transducer (5) electrically connected to the annular receiving coil (3).

2. The ultrasonic machining tool holder assembly with safe tool changing capability as described in claim 1, characterized in that: The machine tool spindle (1) includes a rotating shaft (12) and a spindle housing (13) located outside the rotating shaft (12). The rotating shaft (12) is rotatably located inside the spindle housing (13). The spindle mounting cavity (11) includes a first mounting cavity (112) located on the rotating shaft (12) and a second mounting cavity (113) located on the spindle housing (13). The tool holder connecting part (21) is detachably connected to the first mounting cavity (112). The annular transmitting coil (4) is located on the spindle housing (13) and surrounds the second mounting cavity (113).

3. The ultrasonic machining tool holder assembly with safe tool changing capability as described in claim 2, characterized in that: The coil mounting part (22) is an annular shape protruding from the side wall of the handle connecting part (21), and the second mounting cavity (113) is adapted to the handle connecting part (21).

4. The ultrasonic machining tool holder assembly with safe tool changing capability as described in claim 3, characterized in that: The coil mounting part (22) is provided with a first annular mounting groove (222), the annular receiving end coil (3) is located in the first annular mounting groove (222), the main shaft housing (13) is provided with a second annular mounting groove (134), and the annular transmitting end coil (4) is located in the second annular mounting groove (134).

5. The ultrasonic machining tool holder assembly with safe tool changing capability as described in claim 2, characterized in that: The spindle housing (13) includes an upper housing (131) and a lower housing (132) located below the upper housing (131). The upper housing (131) and the lower housing (132) are detachably connected. A groove (133) is provided between the upper housing (131) and the lower housing (132) for the power line of the annular transmitting coil (4) to pass through.

6. The ultrasonic machining tool holder assembly with safe tool changing capability as described in claim 5, characterized in that: The lower housing (132) is provided with a nozzle mounting seat (1321), the nozzle mounting seat (1321) is provided with a plurality of nozzle mounting interfaces (1322), and the nozzle mounting seat (1321) is provided with a flow channel communicating with the nozzle mounting interfaces (1322).

7. The ultrasonic machining tool holder assembly with safe tool changing capability as described in claim 1, characterized in that: The tool mounting part is a heat-fit tool holder, and the heat-fit tool holder is provided with a heat-shrinkable tool that can be detachably connected to it.

8. The ultrasonic machining tool holder assembly with safe tool changing capability as described in claim 1, characterized in that: A transmitting magnet is provided next to the annular transmitting coil (4), and a receiving magnet is provided next to the annular receiving coil (3). Both the transmitting magnet and the receiving magnet are ferrite soft magnetic cores.

9. The ultrasonic machining tool holder assembly with safe tool changing capability as described in claim 1, characterized in that: The annular receiving coil (3) and the annular transmitting coil (4) are conical coils corresponding to the first conical surface (221) and the second conical surface (111).

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