Keyless tool holder, action execution assembly and machine tool

Abstract

This invention discloses a keyless tool holder, an action execution component, and a machine tool, relating to the field of machine tool technology. The keyless tool holder includes a tool holder body with a locking portion at a first axial position. The tool holder body has a tool-locking groove, a first disc, and a second disc. The first disc is positioned at a second axial position on the tool holder body. A receiving coil is embedded within the first disc. The second disc has an inner edge, and a transmitting coil is embedded within it. The projections of the transmitting coil and the receiving coil onto the axial direction of the tool holder body at least partially overlap. In an initial state, the second disc is located at the first axial position, with its inner edge engaging with the locking portion. During ultrasonic machining, the second disc moves to a preset position, where the projection of the second disc onto the tool holder body at the preset position is at least partially located in the middle of the tool-locking groove. This invention supports upgrading existing machine tools to have ultrasonic machining capabilities, with a simple structure and low cost.

Description

Technical Field

[0001] This invention relates to the field of machine tool technology, and specifically to a keyless tool holder, actuation component, and machine tool that uses ultrasonic processing. Background Technology

[0002] Compared to traditional machine tool spindles, spindles utilize vibration cutting to achieve intermittent contact between the tool and the workpiece chips, thereby reducing cutting heat.

[0003] Existing spindles typically incorporate ultrasonic modules within the spindle itself. While this design meets the requirements of ultrasonic machining, it increases the complexity of the spindle design. Simultaneously, existing ultrasonic toolholder structures are relatively fixed, often achieving contactless power transmission by placing a transmitting coil on the spindle and a receiving coil on the toolholder. This also increases the structural complexity of the spindle and raises the cost of implementing ultrasonic machining functionality. Summary of the Invention

[0004] The main objective of this invention is to provide a keyless tool holder, motion execution component, and machine tool with a simple structure and low cost for achieving ultrasonic processing.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a keyless tool holder, comprising a tool holder body, wherein a locking portion is provided at a first axial position of the tool holder body; and wherein the tool holder body is provided with:

[0007] Tool slot;

[0008] A first disc body is disposed at a second axial position on the tool holder body; a receiving coil is embedded in the disc body of the first disc body;

[0009] The second disc has an inner edge, and a transmitting coil is embedded in the disc. The projections of the transmitting coil and the receiving coil on the axial direction of the tool holder body at least partially coincide.

[0010] When the second disc is subjected to axial force, it can switch between a preset position and the first axial position. In the first axial position, the inner edge of the disc engages with the locking part. In the preset position, the projection of the second disc on the tool holder body is at least partially located in the tool locking groove. The preset position is located between the first axial position and the second axial position.

[0011] In one embodiment of the keyless tool holder, the locking portions are evenly distributed on the peripheral wall of the tool holder body, and locking mating portions corresponding to the number of locking portions are evenly distributed along the inner edge of the disc body.

[0012] In one embodiment of the keyless tool holder, the locking portion includes a locking groove, and the locking mating portion includes an elastic protrusion that mates with the locking groove.

[0013] In one embodiment of the keyless tool holder, the locking groove includes a semi-cylindrical or hemispherical groove with a smooth concave surface;

[0014] The elastic protrusion includes a semi-cylindrical protrusion corresponding to the semi-cylindrical groove, or a hemispherical protrusion corresponding to the hemispherical groove, and the elastic protrusion has a smooth convex surface.

[0015] In one embodiment of the keyless tool holder, the locking portion includes a step, and when the second disc is in the first axial position, the inner edge of the disc is locked onto the peripheral wall of the step.

[0016] In one embodiment of the keyless tool holder, the tool slot is located between the step and the first disc body, the step has a chamfer, and the chamfer slope faces the first disc body.

[0017] In one embodiment of the keyless toolholder, the second disc body is configured to not contact the toolholder body when it is located at the preset position under the action of the actuation component.

[0018] In one embodiment of the keyless tool holder, a connecting portion for connection with an actuation component is provided on the circumferential surface of the second disc body; or,

[0019] The second disc body has a connection part on its surface facing away from the first disc body for connecting with the motion execution component.

[0020] Secondly, the present invention provides an action execution component for mounting on a machine tool spindle, characterized in that the action execution object of the action execution component is a keyless tool holder as described above, and includes an action arm for driving the second disc body to move between the first axial position and the axial position of the tool slot.

[0021] Thirdly, the present invention also provides a machine tool, including a spindle, a keyless tool holder as described above, and an action execution component as described above, the action execution component being mounted on the spindle.

[0022] Working principle of the invention:

[0023] The first disc is positioned at a second axial position on the tool holder body, and a receiving coil is embedded within its disc. The second disc is initially located at a first axial position, and during ultrasonic machining, the second disc moves to a preset position. At this preset position, the projection of the second disc onto the tool holder body is at least partially located within the tool slot. This reduces the contact area between the second disc and the tool holder body, thus mitigating the impact of the second disc on the rotation of the tool holder during ultrasonic machining.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The keyless tool holder provided by this invention supports ultrasonic tool holder machining operations, has a simple structure, and is conducive to standardized production.

[0026] The motion execution component provided by this invention can support the movement of the second disc on the keyless tool holder so that the distance between the first disc and the second disc meets the requirements for contactless inductive power transmission. It has a simple structure and is easy to install.

[0027] The spindle provided by this invention is equipped with the aforementioned motion execution components. Ultrasonic machining can be achieved through an external structure, reducing the difficulty of spindle design. The structure is simple and easy to maintain, and existing machine tools can be directly upgraded to machine tools with ultrasonic machining functions, thus reducing machine tool upgrade costs.

[0028] The present invention provides a machine tool that uses the aforementioned keyless tool holder and motion execution component, which can be upgraded to a machine tool with ultrasonic processing capabilities without replacing the existing spindle structure, resulting in high processing accuracy and low processing heat. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the spindle in an initial state according to one embodiment of the present invention;

[0030] Figure 2 This is a three-dimensional structural diagram of a keyless tool holder provided by the present invention in one embodiment;

[0031] Figure 3 This is a cross-sectional structural diagram of the keyless tool holder provided by the present invention in one embodiment;

[0032] Figure 4 yes Figure 3 A partial enlarged structural diagram of part A in the diagram;

[0033] Figure 5 This is a schematic diagram of the structure of the spindle in one embodiment of the present invention, showing the action execution component in contact with a keyless tool holder;

[0034] Figure 6 yes Figure 5 A magnified schematic diagram of the B section in the diagram;

[0035] Figure 7 It corresponds Figure 1 A schematic diagram of the structure implemented in the middle from a top-down perspective;

[0036] Figure 8 It corresponds Figure 7 A schematic diagram of a modified implementation structure from a top-down perspective.

[0037] Explanation of reference numerals in the attached figures:

[0038] Ultrasonic spindle 1;

[0039] Main spindle body 11; front end cover 111; bearing assembly 112; spindle 113;

[0040] Keyless tool holder 12; connecting shank 121; first disc 122; receiving coil 1221; second disc 123; transmitting coil 1231; connecting groove 1232; tool locking groove 124; transducer 125; amplitude transformer 126; pull stud 127; locking part 128; locking mating part 129;

[0041] Action execution component 13; mounting component 131; ring frame 1311; action execution component 132; action component 1321; drive component 1322. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that when a component is referred to as being "set on" another component, it can be directly set on the other component or there may be an intervening component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is referred to as being "mounted on" another component, it can be directly mounted on the other component or there may be an intervening component.

[0044] Furthermore, it should be understood that all directional indications in the embodiments (such as up, down, left, right, center, etc.) are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the figure). If the specific posture changes, the directional indications will also change accordingly. Terms such as "first" and "second" are used to distinguish different structural components. These terms are only for the purpose of simplifying the description of the present invention and should not be construed as limiting the present invention.

[0045] The keyless tool holder and spindle for mounting the keyless tool holder provided by this invention achieve ultrasonic vibration cutting through a transmitting coil and a receiving coil. Furthermore, it can be installed on an existing spindle by adding appropriate accessory actuators, reducing manufacturing costs and enabling flexible installation. The spindle can be a conventional spindle or an electric spindle.

[0046] See Figures 1 to 7 The present invention provides a machine tool including a spindle 1. The spindle 1 may include a spindle body 11, a keyless tool holder 12, and an actuation assembly 13. The keyless tool holder 12 is detachably mounted on the spindle body 11 and can be rotated and is coaxial with the spindle body 11. The actuation assembly 13 may surround the spindle body 11 and be fixedly mounted on the front end of the spindle body 11, the front end being the spindle portion of the spindle body 11 closer to the tool holder mounting position.

[0047] In this embodiment, the spindle body 11 may include a front end cover 111, a bearing assembly 112, and a spindle 113. The spindle 113 is mounted on the bearing assembly 112 and is supported by the bearing assembly 112 to rotate relative to other parts of the spindle body 11. The spindle 113 is provided with a tool holder mounting position (not shown in the figure), which is used to mount and fix the keyless tool holder 12. The front end cover 111 can be sleeved on the outside of the bearing assembly 112.

[0048] The keyless tool holder 12 can be mounted and fixed on the spindle 113, and can rotate synchronously under the drive of the spindle 113. Here, the keyless tool holder 12 is a keyless tool holder with a pull stud, and correspondingly, a corresponding pull mechanism (not shown in the figure) is provided on the spindle 113.

[0049] like Figure 2 , Figure 3 and Figure 4As shown, the keyless tool holder 12 may include a connecting shank 121, a first disc 122, a second disc 123, a tool slot 124, a transducer 125, an amplitude transformer 126, and a pull stud 127. The connecting shank 121 is used to mount to the tool holder mounting position of the mandrel 113. The first disc 122 and the second disc 123 are located at different positions along the axial direction of the tool holder body and are parallel to each other. Simultaneously, the second disc 123 can move axially relative to the first disc 122; that is, the first disc 122 is a fixed component on the keyless tool holder 12, while the second disc 123 is a movable component on the keyless tool holder 12. The second disc 123 has an inner edge, i.e., the second disc 123 has a through hole, allowing the second disc 123 to be fitted onto the body of the keyless tool holder 12.

[0050] In this invention, a receiving coil 1221 is embedded in the first disc body 122, and a transmitting coil 1231 is embedded in the second disc body 123. The projections of the transmitting coil 1231 and the receiving coil 1221 onto the axial direction of the keyless tool holder 12 body at least partially overlap, so that if either the first disc body 122 or the second disc body 123 rotates relative to the other, contactless power transmission can be supported.

[0051] On the handle body of the keyless tool holder 12, a locking portion 128 is provided at a first axial position, and the first disc body 122 is located at a second axial position. Here, the locking portion 128 is a semi-cylindrical or hemispherical groove. Correspondingly, a locking engagement portion 129 is provided along the inner edge of the disc body 123 to engage with the locking portion 128. The locking engagement portion 129 can be a ball or a roller.

[0052] Preferably, the locking portions 128 are evenly distributed on the peripheral wall of the tool holder body at the first axial position. Correspondingly, locking engagement portions 129, corresponding to the number of locking portions 128, are evenly distributed along the inner edge of the second disc 123. Each locking portion 128 may include a locking groove, which may be a semi-cylindrical or hemispherical groove with a smooth concave surface. Each locking engagement portion 129 includes an elastic protrusion, which may be a semi-cylindrical or hemispherical protrusion with a smooth convex surface. The semi-cylindrical groove corresponds to the semi-cylindrical protrusion, and the hemispherical groove corresponds to the hemispherical protrusion. Of course, the semi-cylindrical and hemispherical protrusions may be limited to a portion of the elastic protrusion structure. Here, the second disc 123 and the tool holder body can be locked together by rolling or sliding.

[0053] When the second disc 123 is subjected to an axial force, it can switch between a first axial position and a preset position, which is the position of the second disc 123 in the ultrasonic processing state. Initially, the second disc 123 is located at the first axial position and is fixed relative to the first disc 122, meaning it cannot rotate relative to the first disc 122. At this time, the second disc 123 is locked and securely engaged with the keyless tool holder 12 body. When an external force is applied towards the first disc 122, and this force is greater than the locking force, the second disc 123 can release the locking state and be allowed to leave the first axial position.

[0054] The second disc 123 is moved away from the first axial position and can be moved to a preset position, which is located between the first axial position and the second axial position. At the preset position, the projection of the second disc 123 onto the tool holder body is at least partially located in the tool slot 124. Accordingly, the second disc 123 reduces its contact area with the tool holder body to mitigate the adverse effect of the second disc 123 on the rotation of the tool holder body under ultrasonic processing conditions; alternatively, the second disc 123 does not contact the tool holder body, thereby avoiding any adverse effect on the rotation of the tool holder body.

[0055] In this invention, the snap-fit ​​portion 128 includes a step, and when the second disc body 123 is in the first axial position, the inner edge of the disc body snaps onto the peripheral wall of the step. Figure 3 and Figure 4 In this configuration, the second disc 123 is engaged with the peripheral wall of the step. Corresponding to the aforementioned structure, the engaging part 128 is disposed on the peripheral wall of the step, and the engaging groove 124 is located between the step and the first disc 122. Furthermore, the step is chamfered, with the chamfered surface facing the first disc 122, and the chamfer is preferably a rounded chamfer.

[0056] like Figure 5 , Figure 6 As shown, the second disc 123 is used to avoid contact with the tool holder body when it is located at the preset position under the action of the action execution component. Accordingly, in the ultrasonic machining state, the second disc 123 will not cause any contact effect on the keyless tool holder 12 body that rotates under the drive of the spindle spindle.

[0057] In this invention, a connecting portion for connecting with an action execution component is provided on the circumferential surface of the second disc body 123; or, a connecting portion for connecting with an action execution component is provided on the disc surface of the second disc body 123 facing away from the first disc body 122. Figure 4 , Figure 6In this design, the connecting part is a connecting groove 1232, located on the surface of the second disk 123 facing away from the first disk 122. The connecting groove 1232 may include a guide groove near the periphery of the disk and a insertion groove near the inner edge of the disk, with the insertion groove being deeper than the guide groove. The guide groove guides the motion execution component 13 to slide radially upwards towards the insertion groove during the process of moving the second disk 123 to a preset position, and both the guide groove and the insertion groove have inclined or arc-shaped transition structures on their sidewalls. The insertion groove allows the second disk 123 to be inserted into the actuating end of the motion execution component 13, forming an electrical connection. Correspondingly, the current output by the ultrasonic generator can be conducted to the transmitting coil 1231 via the motion execution component 13. Specifically, the insertion groove contains a insertion fitting, and the motion execution component 13 has a fitting; the two are inserted into each other, and this insertion can be an electrical connector or a simple contact / point insertion. Here, the mating fit can form a mating fit between male and female connectors with waterproof and dustproof functions.

[0058] The keyless tool holder 12 is also provided with a transducer 125 and an amplitude transformer 126. The transducer 125 is electrically connected to the receiving coil 1221, and the amplitude transformer 126 is located on the vibrating end side of the transducer 125.

[0059] like Figure 1 , Figures 5 to 8 As shown, the present invention provides an action execution assembly 13 for mounting on a machine tool spindle. The action execution object of the action execution assembly 13 is the aforementioned keyless tool holder 12. It includes an action execution member for driving the second disc body 123 to move between the first axial position and the axial position of the tool slot. This action execution member serves as an actuating arm. The action execution assembly 13 includes a mounting member 131 and an action execution member 132. The mounting member 131 may be a ring frame 1311, which can be sleeved and fixed on the front end cover 111 of the spindle body 11. The action execution member 132 may include an actuating member 1321 and a driving member 1322 for driving the actuating member 1321.

[0060] exist Figure 1 In the initial operating state, the motion execution component 13 is in the first axial position, and the tool holder groove 124 allows the tool changer arm to normally insert the tool holder to support the tool changer arm in tool changing operations. The actuating element 1321 is a flipping element, and the driving element 1322 is a flipping drive shaft. By driving the actuating element 1321 to flip, the actuating end of the actuating element 1321 acts on the bottom surface of the second disc 123 and moves it to a preset position (corresponding to...). Figure 6 (Position in the middle).

[0061] exist Figures 5 to 7In the process, the motion execution component 13 moves the second disc 123 to a preset position. At this time, the second disc 123 is not in contact with the tool holder body. However, if the transmitting coil 1231 is energized and the keyless tool holder 12 rotates under the drive of the spindle, the receiving coil 1221 in the first disc 122 can receive the current of the transmitting coil 1231 without contact. This current can be transmitted to the transducer 125, which converts the electrical signal into mechanical vibration. This mechanical vibration can be transmitted to the tool through the amplitude transformer 126, thereby realizing ultrasonic machining. Here, the transducer 125 can be a piezoelectric ceramic transducer.

[0062] like Figure 7 and Figure 8 The image shows a top-down view of the structure of the motion execution component 13 provided by the present invention mounted on the machine tool spindle, wherein... Figure 7 The structure consists of four actuators 132. Figure 8 The structure is a three-action actuator 132.

[0063] In this invention, the mounting component 131 is an integral structure. However, in some modified embodiments, the mounting component 131 can also be a split structure, that is, it includes multiple fixing units, and the multiple fixing units are respectively disposed on the peripheral wall of the front end cover 111. Preferably, the multiple fixing units are evenly distributed. In addition, the action execution component 13 can also be provided with an electrical connection component. Specifically, the mounting component 131 ring frame is provided with an access port for electrical connection with the ultrasonic generator. The body of the action component 1321, as described above, has a wire electrically connected to the access port in the flipping component. The action end is provided with the aforementioned plug-in fitting component. The plug-in fitting component is also provided with a connection port for forming an electrical connection with the transmitting coil 1231. The connection port is electrically connected to the wire, and the wire is a retractable wire.

[0064] In one modified embodiment, the action execution component 132 of the action execution component 13 may include a secondary telescopic component as an action component 1321 and a telescopic driver as a drive component 1322, thereby achieving the action on the second disc 123 through the two-stage telescopic cooperation.

[0065] In this invention, to enable the connector on the actuator to quickly and accurately align with the connector on the movable component, the ring frame of the actuator assembly may further include an inner ring frame and an outer ring frame. The inner ring frame is fixed, while the outer ring frame can be driven by a motor to rotate relative to the inner ring frame, supporting the adjustment of the actuator's position for alignment operations. Simultaneously, an alignment sensor may be provided on the outer ring frame, and correspondingly, an alignment mark is provided on the second disc. When the alignment sensor senses the alignment mark, it can determine that the current alignment state is achieved. Alternatively, a camera can be used, and a feature structure can be provided on the second disc for image recognition. This feature structure is preferably located on the circumferential surface of the second disc (vertical to the axial direction of the tool holder body).

[0066] The machine tool provided by the present invention includes a spindle, a keyless tool holder as described above, and an action execution component as described above, wherein the action execution component is mounted on the spindle.

[0067] As can be seen from the above, in the keyless tool holder 12 of the present invention, the first disc 122 is provided with a receiving coil 1221, and the second disc 123 is provided with a transmitting coil 1231. The second disc 123 can have different rotation states relative to the first disc 122 at different positions. Specifically, after the second disc 123 is moved to a preset position, it can form a contactless power transmission with the first disc 122, thereby realizing ultrasonic processing.

[0068] In the spindle 1 provided by this invention, the action execution component 13 acts on the second disc 123 in the keyless tool holder 12, allowing it to move relative to the first disc 122 at different axial positions. This enables the second disc 123 to have different rotational states relative to the first disc 122 at different positions, achieving ultrasonic machining without affecting the tool changing operation of the keyless tool holder 12. No changes to the existing spindle structure are required; it can be installed and fixed using the mounting part 131 of the action execution component 13. This supports upgrading existing ordinary machine tools to ultrasonic machining machine tools, improving machining accuracy, reducing machining heat, and achieving ultrasonic machining through an external structure. This reduces the difficulty of spindle design, and the simple structure facilitates maintenance. Existing machine tools can be directly upgraded to have ultrasonic machining capabilities, reducing machine tool upgrade costs.

[0069] The motion execution component 13 provided by the present invention can support the movement of the second disc 123 on the keyless tool holder 12 so that the distance between the first disc 122 and the second disc 123 meets the requirements for contactless inductive power transmission. It has a simple structure and is easy to install.

[0070] The present invention also provides a machine tool that uses the above-mentioned keyless tool holder and motion execution component, which can have the advantages of the keyless tool holder 12, the advantages of the motion execution component 13 and / or the advantages of the spindle 1. It can be upgraded to a machine tool with ultrasonic processing capability without replacing the existing spindle structure, with high processing accuracy and low processing heat.

[0071] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0072] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A keyless tool holder, characterized in that, The tool holder body includes a locking portion at a first axial position; the tool holder body is provided with: Tool slot; A first disc body is disposed at a second axial position on the tool holder body; a receiving coil is embedded in the disc body of the first disc body; The second disc has an inner edge, and a transmitting coil is embedded in the disc. The projections of the transmitting coil and the receiving coil on the axial direction of the tool holder body at least partially coincide. When the second disc is subjected to axial force, it can switch between a preset position and the first axial position. In the first axial position, the inner edge of the disc engages with the locking part. In the preset position, the projection of the second disc on the tool holder body is at least partially located in the tool locking groove. The preset position is located between the first axial position and the second axial position. The second disc is designed to not contact the handle body when it is located at the preset position under the action of the action execution component.

2. The keyless tool holder as described in claim 1, characterized in that, The locking parts are evenly distributed on the peripheral wall of the handle body, and the inner edge of the disc is evenly distributed with locking mating parts corresponding to the number of locking parts.

3. The keyless tool holder as described in claim 2, characterized in that, The snap-fit ​​portion includes a snap-fit ​​groove, and the snap-fit ​​mating portion includes an elastic protrusion that mates with the snap-fit ​​groove.

4. The keyless tool holder as described in claim 3, characterized in that, The snap-fit ​​groove includes a semi-cylindrical or hemispherical groove with a smooth concave surface; The elastic protrusion includes a semi-cylindrical protrusion corresponding to the semi-cylindrical groove, or a hemispherical protrusion corresponding to the hemispherical groove, and the elastic protrusion has a smooth convex surface.

5. The keyless tool holder as described in claim 1, characterized in that, The locking part includes a step, and when the second disc is in the first axial position, the inner edge of the disc is locked onto the peripheral wall of the step.

6. The keyless tool holder as described in claim 5, characterized in that, The tool slot is located between the step and the first disc body. The step has a chamfer, and the chamfer slope faces the first disc body.

7. The keyless tool holder as described in claim 6, characterized in that, A connecting portion for connecting to the motion execution component is provided on the circumferential surface of the second disk; or... The second disc body has a connection part on its surface facing away from the first disc body for connecting with the motion execution component.

8. A motion execution assembly for mounting on a machine tool spindle, characterized in that, The action execution object of the action execution component is the keyless tool holder as described in any one of claims 1 to 7, including an action arm for driving the second disc body to move between the first axial position and the axial position of the tool slot.

9. A machine tool, characterized in that, It includes a spindle, a keyless tool holder as described in any one of claims 1 to 7, and an action execution component as described in claim 8, wherein the action execution component is mounted on the spindle.

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