Polishing electric spindle

Abstract

The utility model relates to the technical field of machining, and discloses a polishing motorized spindle which comprises a shell. The shaft core is arranged in an inner cavity of the shell; the ultrasonic transducer is arranged in an inner cavity of the shaft core, the end of the ultrasonic transducer protrudes out of the shell and the end of the shaft core, and the ultrasonic transducer is used for being connected with a grinding head; the driving assembly comprises a motor stator and a motor rotor which are oppositely arranged in the radial direction of the shaft core, the motor rotor is arranged on the periphery of the shaft core, and the motor stator is connected with the inner wall of the shell. The ultrasonic polishing device can drive the grinding head to rotate and perform ultrasonic vibration to realize ultrasonic polishing, and can effectively improve the surface quality and the polishing efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, and more specifically, particularly relates to a polishing electric spindle. Background Art

[0002] The precision machining of hard and brittle materials such as functional ceramics, quartz wafers, planar or polyhedral crystals and optical devices requires extremely small flatness, extremely small surface roughness, and ultra-smooth surfaces. It also requires that the two end faces of the material be strictly parallel, without crystal orientation errors, and without a metamorphic layer on the surface. Some even require nanometer-level or higher machining accuracy and damage-free surface machining quality. Polishing can achieve the requirements for high-quality material surfaces.

[0003] Ultrasonic assisted polishing combines ultrasonic vibration with polishing, which can effectively improve surface quality and polishing efficiency. The existing method uses a transducer to connect the polishing head to transmit ultrasonic vibration to the polishing head, which is not convenient for installation with the machine tool. Although the spindle is also used to cooperate with the machine tool, the tail of the spindle is usually equipped with a power mechanism, which will cause interference when cooperating with the machine tool under some working conditions and does not meet the actual requirements. Summary of the invention

[0004] The utility model aims to provide a polishing electric spindle to solve the technical problems existing in the prior art, which can drive the grinding head to rotate and ultrasonically vibrate to realize ultrasonic polishing, thereby effectively improving the surface quality and polishing efficiency.

[0005] In order to solve the above problems, the technical solution adopted by the utility model is:

[0006] The utility model provides a polishing electric spindle, comprising:

[0007] case;

[0008] An axis core is arranged in the inner cavity of the shell;

[0009] An ultrasonic transducer is arranged in the inner cavity of the shaft core, and an end of the ultrasonic transducer protrudes from the shell and the end of the shaft core, and is used for connecting the grinding head;

[0010] The driving assembly comprises a motor stator and a motor rotor which are arranged radially and oppositely to each other along the shaft core, wherein the motor rotor is arranged on the outer periphery of the shaft core, and the motor stator is connected to the inner wall of the shell.

[0011] Furthermore, a connecting sleeve is arranged in the shell, one end of the connecting sleeve is sleeved on the outer periphery of the shaft core, and the other end of the connecting sleeve is movably connected to the end of the shell.

[0012] Furthermore, a bearing group is arranged between the shell and the outer periphery of the shaft core, and a spacer sleeve is arranged to pre-tighten and limit the bearing group; a locking assembly is also sleeved on the outer periphery of the shaft core to lock the bearing group.

[0013] Furthermore, a slip ring is also arranged on the outer periphery of the connecting sleeve, and the slip ring is respectively connected to the ultrasonic transducer and the external ultrasonic power supply wire.

[0014] Furthermore, the connecting sleeve has a corresponding first limiting protrusion and a second limiting protrusion, the first limiting protrusion abuts against the end of the slip ring for limiting position; the second limiting protrusion is sleeved on the outer periphery of the shaft core.

[0015] Furthermore, the end positions of one side of the shaft core and the shell correspond to each other, and a spindle end cover is provided for connection and cooperation; the spindle end cover is provided with an end cover through hole for the end of the grinding head to pass through, and a limiting protrusion is also provided on the end surface of the spindle end cover, and the limiting steps on the limiting protrusion are respectively connected and cooperated with the ends of the shaft core and the shell.

[0016] Furthermore, the connecting sleeve is provided with a central through groove or a ventilation groove communicating with the inner cavity of the shaft core for introducing cooling gas;

[0017] And / or, an annular groove or a spiral groove is provided on the inner wall of the shaft core.

[0018] Furthermore, an insulating sleeve is provided between the shaft core and the ultrasonic transducer, and the insulating sleeve corresponds to the position of the piezoelectric ceramic sheet in the ultrasonic transducer.

[0019] Furthermore, a pressing sleeve is arranged in the shaft core, a mounting boss is arranged on the inner wall of the shaft core, an insulating sleeve and a pressing sleeve are arranged on the mounting boss in sequence, and two ends of the pressing sleeve are respectively abutted against the connecting sleeve and the insulating sleeve.

[0020] Furthermore, the main shaft also includes a wireless sensing module, which includes a power receiving module and a power supply module arranged along the axial direction of the shell and in the insulating sleeve, the power receiving module is arranged at the end of the ultrasonic transducer and is connected by a wire; the power supply module is abutted and matched with the pressing sleeve and connected to the slip ring wire.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] In the utility model, the shaft core and the grinding head are driven to rotate by a driving component. The driving component adopts an electronic stator and a motor rotor built in the shell, which fully utilizes the space in the inner cavity of the shell; the grinding head is driven to perform ultrasonic vibration by an ultrasonic transducer, so that the grinding head performs ultrasonic polishing on the workpiece, that is, the rotation function is added on the basis of high-power ultrasonic vibration. During the processing, the grinding head rotates to enhance the fluidity of the abrasive. The overall structure is simple and the installation and matching are reliable, the polishing effect is enhanced and the processing time is shortened, and the processing efficiency and processing accuracy of the parts are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the scheme of the utility model, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0024] Figure 1 This is a structural diagram of Example 1 of the polishing electric spindle in the utility model.

[0025] Figure 2 It is a schematic diagram of the cooperation between the polishing electric spindle and the grinding head in the utility model.

[0026] Figure 3 This is another structural diagram of Example 1 of the polishing electric spindle in the present utility model.

[0027] Figure 4 It is a partial schematic diagram of Example 1 of the polishing electric spindle in the utility model.

[0028] Figure 5 It is another partial schematic diagram of Example 1 of the polishing electric spindle in the utility model.

[0029] Figure 6 This is a structural diagram of Example 2 of the polishing electric spindle in the present utility model.

[0030] Figure 7 This is a structural diagram of Example 3 of the polishing electric spindle in the present utility model.

[0031] Among them, 100-electric spindle, 200-grinding head, 1-housing, 2-shaft core, 3-ultrasonic transducer, 41-motor stator, 42-motor rotor, 5-cover, 6-connecting sleeve, 7-slip ring, 8-spindle end cover, 81-end cover through hole, 82-limiting protrusion, 9-mounting sleeve, 10-first bearing, 11-second bearing, 12-first spacer, 13-second spacer, 14-locking nut, 15-washer, 16-insulating sleeve, 17-pressing sleeve, 18-third spacer, 201-first mounting boss, 202-second mounting boss, 51-hose connector, 52-outlet connector, 61-center through groove, 62-first limiting protrusion, 63-second limiting protrusion, 64-ventilation groove, 71-limiting recess, 191-power receiving module, 192-power supply module, 200-grinding head. DETAILED DESCRIPTION

[0032] Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as commonly understood by technicians in the technical field of the present invention; the terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For example, the directions or positions indicated by terms such as "length", "width", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the directions or positions shown in the drawings, which are only for the convenience of description and cannot be understood as limitations on the present technical solution.

[0033] The terms "including" and "having" and any variations thereof in the specification and claims of the utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions; the terms "first", "second", etc. in the specification and claims of the utility model or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In the specification and claims of the utility model and the above-mentioned drawings, when an element is referred to as "fixed to" or "mounted on" or "disposed on" or "connected to" another element, it may be directly or indirectly located on the other element. For example, when an element is referred to as "connected to" another element, it may be directly or indirectly connected to the other element.

[0034] In addition, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] Embodiment 1

[0036] See also Figure 1 and Figure 2 As shown, the utility model provides a polishing electric spindle 100, including a shell 1, a shaft core 2, an ultrasonic transducer 3, and a drive assembly. The shaft core 2 is arranged in the inner cavity of the shell 1, and the ultrasonic transducer 3 is arranged in the inner cavity of the shaft core 2.

[0037] The driving assembly includes a motor stator 41 and a motor rotor 42 which are arranged radially and relatively to each other along the shaft core 2. The motor rotor 42 is arranged on the outer periphery of the shaft core 2 and rotates with the shaft core 2. The motor stator 41 is arranged on the inner wall of the housing 1 and is connected to an external power supply.

[0038] The ends of the ultrasonic transducer 3 protrude from the ends of the housing 1 and the shaft core 2 and are used to connect to the grinding head 200 to achieve ultrasonic polishing.

[0039] In this embodiment, the driving assembly is built into the housing 1, making full use of the installation space of the inner cavity of the housing 1. When the motor stator 41 is powered on, the motor rotor 42 and the shaft core 2 are driven to rotate, and the shaft core 2 drives the ultrasonic transducer 3 and then drives the grinding head 200 to rotate. The ultrasonic transducer 3 is connected to an external ultrasonic power supply to drive the grinding head 200 to perform ultrasonic vibration, that is, the grinding head 200 performs ultrasonic polishing on the surface of the material.

[0040] Furthermore, a connecting sleeve 6 is provided in the shell 1, one end of the connecting sleeve 6 is sleeved on the outer periphery of the shaft core 2, and the other end of the connecting sleeve 6 is movably connected to the end of the shell 1, which can ensure the reliability of the installation fit between the shaft core 2 and the shell 1.

[0041] In some embodiments, the end of the shell 1 is detachably connected with a cover plate 5 and a mounting sleeve 9, and the mounting sleeve 9 is arranged on the outer periphery of the connecting sleeve 6 to facilitate the installation and matching of the overall structure of the main shaft; the cover plate 5 and the end of the connecting sleeve 6 are movably connected to ensure the reliability of the rotational movement of the shaft core 2 and the connecting sleeve 6.

[0042] For further information, see Figure 3 to Figure 6 As shown, a bearing group (10, 11) is arranged between the housing 1 and the outer periphery of the shaft core 2, and a spacer (12, 13, 18) is arranged to pre-tighten and limit the bearing group, so that the shaft core 2 can reliably rotate in the housing 1.

[0043] Specifically, the bearing group includes a first bearing 10 and a second bearing 11 respectively arranged along the axial direction of the housing 1 and located on both sides of the drive assembly. The first bearing 10 is close to the end of the housing 1, and the second bearing 11 is located in the middle of the housing 1. Both are sleeved on the outer periphery of the shaft core 2, which can reliably support the shaft core 2. A first spacer sleeve 12 is arranged between the first bearing 10 and the motor rotor 42 of the drive assembly, and a second spacer sleeve 13 and a third spacer sleeve 18 are respectively arranged between the second bearing 11 and the motor rotor 42 of the drive assembly, and between the second bearing 11 and the corresponding ends of the mounting sleeve 9, respectively, to pre-tighten and limit the first bearing 10 and the second bearing 11, and further ensure the reliability of the rotational movement of the shaft core 2.

[0044] Furthermore, in order to ensure the reliability of the installation of the bearing group, a locking assembly is also sleeved on the outer periphery of the shaft core 2, and the locking assembly is located on one side of the bearing group and locks and limits the bearing group; a first mounting boss 201 is set on the outer periphery of the shaft core 2, and the first mounting boss 201 is used to install and limit the bearing group.

[0045] Specifically, the first bearing 10 is disposed on the first mounting boss 201 , and the locking assembly is located on the other side of the second bearing 11 away from the first mounting boss 201 , which can ensure that both the first bearing 10 and the second bearing 11 are reliably installed.

[0046] In this embodiment, the locking assembly includes a locking nut 14 and a washer 15 which are sequentially sleeved on the outer periphery of the shaft core 2. The washer 15 and the locking nut 14 are arranged along the axial direction of the housing 1. The washer 15 is close to the second bearing 11. The structure is simple and can ensure the reliability of the installation of the bearing group. Of course, in other embodiments, the locking assembly can also adopt other structures to achieve reliable installation of the bearing group.

[0047] Furthermore, an insulating sleeve 16 is provided between the shaft core 2 and the ultrasonic transducer 3, and the insulating sleeve 16 corresponds to the position of the piezoelectric ceramic sheet in the ultrasonic transducer 3. Since the ultrasonic transducer 3 generates a high voltage when connected to an external ultrasonic power source, the piezoelectric ceramic sheet of the ultrasonic transducer 3 and the shaft core 2 are isolated by the insulating sleeve 16, thereby ensuring the reliability of the operation of both the shaft core 2 and the ultrasonic transducer 3.

[0048] A pressing sleeve 17 is also provided in the shaft core 2, one end of the pressing sleeve 17 abuts against the connecting sleeve 6, and the other end of the pressing sleeve 17 abuts against the insulating sleeve 16, which can ensure the reliability of the installation of the overall structure. Specifically, a second mounting boss 202 is provided on the inner wall of the shaft core 2, and the insulating sleeve 16 and the pressing sleeve 17 are sequentially provided on the second mounting boss 202 along the axial direction, which facilitates the installation and makes the installation reliable.

[0049] Furthermore, a slip ring 7 is provided on the outer periphery of the connecting sleeve 6, and the slip ring 7 is respectively connected to the ultrasonic transducer 3 and the external ultrasonic power supply through wires to prevent the wires from being entangled and affecting the operation of the main shaft when the shaft core 2 and the ultrasonic transducer 3 rotate. The electrical energy conversion by the slip ring 7 can ensure the reliability of the operation of the main shaft.

[0050] In order to facilitate the insertion and connection of wires, a hose connector 51 and a wire outlet connector 52 are also provided on the cover plate 5.

[0051] Furthermore, the shaft core 2 and one end of the housing 1 correspond to each other, and a spindle end cover 8 is provided for connection and cooperation. The spindle end cover 8 is provided with an end cover through hole 81 for the end of the grinding head 20 to pass through, which is convenient for installation and ensures reliable connection. A limiting convex portion 82 is also provided on the end surface of the spindle end cover 8, and the limiting steps on the limiting convex portion 82 are respectively connected and cooperated with the ends of the shaft core 2 and the housing 1 to ensure the reliability of the connection.

[0052] It is understandable that the housing 1 and the spindle end cover 8 can be an integral structure, that is, the end cover through hole 81 and the limiting protrusion 82 are directly formed on the inner side of the end of the housing 1, and can also play the role of connecting with and limiting the shaft core 2.

[0053] For further information, see Figure 6 As shown, the connecting sleeve 6 is provided with a central through groove 61 , and the central through groove 61 is used for letting in cooling gas and is in communication with the inner cavity of the shaft core 2 .

[0054] It is understandable that, in order to facilitate the introduction of cooling gas, a ventilation groove 64 may also be provided on the connecting sleeve 6 along the axial direction. The ventilation groove 64 is also used for the introduction of cooling gas and is connected with the inner cavity of the shaft core 2 .

[0055] Specifically, after the cooling gas is introduced through the central through groove 61 or the vent groove 64, it enters the inner cavity of the pressing sleeve 17 and the insulating sleeve 16 in turn, and enters the gap between the shaft core 2 and the ultrasonic transducer 3, that is, it acts on the heat-generating components of the ultrasonic transducer 3 to achieve cooling. After cooling, the gas flows along the axial direction of the housing 1, and is discharged from the housing 1 of the spindle through the gap between the outer periphery of the end of the ultrasonic transducer 3 and the spindle end cover 8.

[0056] Furthermore, annular grooves 203 are provided on the inner wall of the shaft core 2 and on the outer periphery of the ultrasonic transducer 3 correspondingly, and a plurality of groups of the annular grooves 203 are provided in parallel along the axial direction of the shaft core 2 .

[0057] Specifically, by providing the annular groove 203, the contact area between the cooling gas and the outer periphery of the ultrasonic transducer 3 can be increased, and multiple groups of annular grooves 203 are provided to further improve the cooling efficiency of the ultrasonic transducer 3. In some embodiments, the inner wall of the shaft core 2 can also be provided with a spiral groove, and the cooling gas flows along the spiral direction of the spiral groove to take away the heat generated by the ultrasonic transducer 3 to achieve cooling.

[0058] Furthermore, the connecting sleeve 6 has corresponding first limiting protrusions 62 and second limiting protrusions 63, and the first limiting protrusions 62 abut against the end of the slip ring 7 for limiting position; the second limiting protrusions 63 are sleeved on the outer periphery of the shaft core 2 and abut against the locking nut 14 of the locking assembly for limiting position.

[0059] It is understandable that a limiting recess 71 can be provided at the end of the slip ring 7, and the limiting recess 71 is connected and matched with the first limiting protrusion 62, so as to ensure the reliability of the installation of the overall structure. Of course, a limiting protrusion can be provided on the slip ring 7, and a limiting recess can be provided on the connecting sleeve 6, which can also play a role of connection and matching.

[0060] In this embodiment, the ultrasonic transducer 3 can drive the grinding head 200 to perform single vibration or compound vibration according to actual processing needs to meet different processing requirements, thereby enhancing the polishing effect and improving the processing accuracy.

[0061] Embodiment 2

[0062] The biggest difference between the second embodiment and the first embodiment is that a wireless sensing module is added to the housing 1. Figure 7 As shown, the wireless sensing module includes a power receiving module 191 and a power supply module 192 arranged axially along the shell 1, the power receiving module 191 is arranged at the end of the ultrasonic transducer 3 and is connected by a wire; the power supply module 192 is abutted and matched with the pressing sleeve 17, and the power supply module 192 is connected to the slip ring 7 by a wire; the power receiving module 181 and the power supply module 182 are both arranged in the insulating sleeve 16.

[0063] In the second embodiment, the power receiving module 191 and the power supply module 192 are gap-matched for wireless power transmission. Compared with the ultrasonic transducer 3 directly connected to the external ultrasonic power supply, wireless power transmission can improve the transmission efficiency of electric energy and meet different processing requirements. The wireless sensing module is arranged in the insulating sleeve 16 and placed between the end of the ultrasonic transducer 3 and the pressing sleeve 17, which can make full use of the installation space in the shaft core 2, and also limit the pressing sleeve 17 to ensure the reliability of the overall structure installation.

[0064] Embodiment 3

[0065] The biggest difference between the third embodiment and the first and second embodiments is that the outer periphery of the connecting sleeve does not need to be provided with a slip ring. Figure 7 As shown, a limiting convex ring 631 is formed at one end of the second connecting sleeve 601, and the limiting convex ring 631 is sleeved on the outer periphery of the end of the shaft core 2; the other end of the second connecting sleeve 601 is movably connected to the end of the housing 1. The wire passes through the center hole of the second connecting sleeve 601, and the shaft core 2 is controlled to move forward and backward through the driving component, and the shaft core 2 can also be driven to rotate, which simplifies the overall structure of the spindle and reduces the cost.

[0066] In the utility model, the shaft core 2 and the grinding head 200 are driven to rotate by a driving component, and the grinding head 200 is driven to perform ultrasonic vibration by an ultrasonic transducer 3, so that the grinding head 200 performs ultrasonic polishing on the workpiece. The overall structure is simple and the installation is reliable. The ultrasonic transducer 3 can be directly connected to an ultrasonic power supply for power transmission, and can also be connected to an ultrasonic power supply for wireless power transmission through a wireless sensing module, so as to meet different actual processing requirements, thereby effectively improving the polishing surface quality and polishing efficiency.

[0067] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A polishing electric spindle, characterized in that: include: case; An axis core is arranged in the inner cavity of the shell; An ultrasonic transducer is arranged in the inner cavity of the shaft core, and an end of the ultrasonic transducer protrudes from the shell and the end of the shaft core, and is used for connecting the grinding head; The driving assembly comprises a motor stator and a motor rotor which are arranged radially and oppositely to each other along the shaft core, wherein the motor rotor is arranged on the outer periphery of the shaft core, and the motor stator is connected to the inner wall of the shell.

2. The polishing electric spindle according to claim 1, characterized in that: A connecting sleeve is arranged in the shell, one end of the connecting sleeve is sleeved on the outer periphery of the shaft core, and the other end of the connecting sleeve is movably connected to the end of the shell.

3. The polishing electric spindle according to claim 1, characterized in that: A bearing group is arranged between the shell and the outer periphery of the shaft core, and a spacer is arranged to pre-tighten and limit the bearing group; a locking component for locking the bearing group is also sleeved on the outer periphery of the shaft core.

4. The polishing electric spindle according to claim 2, characterized in that: A slip ring is also arranged on the outer periphery of the connecting sleeve, and the slip ring is respectively connected to the ultrasonic transducer and the external ultrasonic power supply wire.

5. The polishing electric spindle according to claim 4, characterized in that: The connecting sleeve is provided with a corresponding first limiting protrusion and a second limiting protrusion, wherein the first limiting protrusion abuts against the end of the slip ring for limiting; and the second limiting protrusion is sleeved on the outer periphery of the shaft core.

6. The polishing electric spindle according to claim 1, characterized in that: The ends of one side of the shaft core and the shell are positioned correspondingly, and a spindle end cover is provided for connection and cooperation; an end cover through hole for the end of the grinding head to pass through is provided on the spindle end cover, and a limiting protrusion is also provided on the end surface of the spindle end cover, and the limiting steps on the limiting protrusion are respectively connected and cooperated with the ends of the shaft core and the shell.

7. The polishing electric spindle according to claim 2, characterized in that: The connecting sleeve is provided with a central through groove or a vent groove communicating with the inner cavity of the shaft core for introducing cooling gas; And / or, an annular groove or a spiral groove is provided on the inner wall of the shaft core.

8. The polishing electric spindle according to claim 4, characterized in that: An insulating sleeve is arranged between the shaft core and the ultrasonic transducer, and the insulating sleeve corresponds to the position of the piezoelectric ceramic sheet in the ultrasonic transducer.

9. The polishing electric spindle according to claim 8, characterized in that: A pressing sleeve is also arranged in the shaft core, a mounting boss is arranged on the inner wall of the shaft core, an insulating sleeve and a pressing sleeve are arranged on the mounting boss in sequence, and two ends of the pressing sleeve are respectively in contact with the connecting sleeve and the insulating sleeve.

10. The polishing electric spindle according to claim 9, characterized in that: The main shaft also includes a wireless sensing module, which includes a power receiving module and a power supply module arranged along the axial direction of the shell and in the insulating sleeve. The power receiving module is arranged at the end of the ultrasonic transducer and is connected through a wire; the power supply module is abutted and matched with the pressing sleeve and connected to the slip ring wire.

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