Ultrasonic gas float main shaft unit

Abstract

The utility model relates to mechanical processing technical field discloses an ultrasonic gas float main shaft unit, including body, axle core, energy transmission subassembly and transducer subassembly, the axle core is located the inner chamber of body, and can rotate relative to the body, energy transmission subassembly is located between the inner side of body and the outside of axle core, the front end inner chamber of axle core sets up tool, the rear end circumference of axle core sets up transducer subassembly, transducer subassembly with energy transmission subassembly electricity is connected. The utility model can improve ultrasonic energy, and can reach the ultrasonic amplitude needed for ultrasonic machining, thereby improving the machining efficiency of main shaft.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and more specifically, to an ultrasonic air-bearing spindle unit. Background Technology

[0002] Ultrasonic machining, due to the ultrasonic energy at the tool tip, is widely used for machining non-metallic, hard and brittle, and other difficult-to-machine materials, as well as for machining micro-holes and deep holes. Current ultrasonic air-bearing spindle structures generally embed the transducer assembly within the spindle core cavity, often resulting in insufficient converted ultrasonic energy and an ultrasonic amplitude that falls far short of the requirements for ultrasonic machining. This situation has become a major bottleneck in ultrasonic machining of ultra-high speed, small-diameter spindles. Summary of the Invention

[0003] The purpose of this invention is to address the technical problems existing in the prior art by providing an ultrasonic air-bearing spindle unit that can improve ultrasonic energy and increase the processing efficiency of the spindle unit.

[0004] To solve the problems mentioned above, the technical solution adopted by this utility model is as follows:

[0005] This utility model provides an ultrasonic air-bearing spindle unit, including a body, a core, an energy transmission assembly, and a transducer assembly. The core is disposed in the inner cavity of the body and is rotatable relative to the body. The energy transmission assembly is disposed between the inner side of the body and the outer side of the core.

[0006] A cutting tool is provided in the inner cavity of the front end of the shaft core, and a transducer assembly is provided on the outer periphery of the rear end of the shaft core. The transducer assembly is electrically connected to the energy transmission assembly.

[0007] Furthermore, a first air bearing assembly and a second air bearing assembly are sequentially provided between the inner side of the body and the outer side of the shaft core to form an air film on the outer periphery of the shaft core; the first air bearing assembly and the second air bearing assembly are respectively located on both sides of the energy transmission assembly, and the second air bearing assembly is located between the energy transmission assembly and the transducer assembly.

[0008] Furthermore, the first air bearing assembly includes a first air bearing sleeved on the outer periphery of the shaft core;

[0009] The second air bearing assembly includes a second air bearing and an air bearing bushing that are radially sleeved on the outer periphery of the shaft core, the air bearing bushing being located between the shaft core and the second air bearing.

[0010] Furthermore, the outer periphery of the shaft is provided with a first boss and a second boss in sequence along the axial direction, and the first air bearing is provided on one side of the first boss.

[0011] Furthermore, the energy transmission component includes a wireless power receiving module and a wireless power supply module arranged radially and spaced apart along the shaft core. The wireless power receiving module abuts and limits the second protrusion of the shaft core, and the wireless power supply module is connected to the inner wall of the body.

[0012] Furthermore, the rear end of the body is provided with a rear end cover, which is located on the outer periphery of the transducer assembly.

[0013] Furthermore, the front end of the main body is provided with a front end cover, which is located on the outer periphery of the shaft core, and an air blowing ring is provided between the inner side of the front end cover and the outer side of the shaft core.

[0014] Furthermore, the first air bearing assembly also includes a thrust bearing, which is disposed on the outer periphery of the shaft core and located between the front end cover and the first boss on the outer periphery of the shaft core.

[0015] Furthermore, the air-bearing bushing is provided with a wire-passing hole for the connecting wire between the wireless power receiving module and the transducer assembly to pass through.

[0016] Furthermore, the rear end of the shaft is provided with a connected radial wire hole and an axial wire hole, and the connecting wire between the wireless power receiving module and the transducer assembly passes through the radial wire hole and the axial wire hole in sequence.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] In this invention, the transducer assembly is placed on the outer periphery of the rear end of the spindle, which can improve the ultrasonic energy and achieve the ultrasonic amplitude required for ultrasonic processing, thereby improving the processing efficiency of the spindle. At the same time, it shortens the distance between the transducer assembly and the energy transmission assembly, improves the dynamic balance performance of the spindle, and also ensures the processing performance of the spindle. Attached Figure Description

[0019] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0020] Figure 1 This is a structural diagram of Embodiment 1 of the ultrasonic air-bearing spindle unit in this utility model.

[0021] Figure 2 This is another structural diagram of the ultrasonic air-bearing spindle unit in Embodiment 1 of this utility model.

[0022] Figure 3This is a partial view of Embodiment 1 of the ultrasonic air-bearing spindle unit of this utility model.

[0023] Figure 4 This is a structural diagram of Embodiment 2 of the ultrasonic air-bearing spindle unit in this utility model.

[0024] Among them, 1-body, 2-shaft core, 3-energy transmission component, 4-tool, 5-transducer component, 6-first air bearing component, 7-second air bearing component, 8-rear end cover, 9-connector, 10-front end cover, 101-axial air passage, 110-sealing air passage, 21-positioning boss, 22-radial wire hole, 23-axial wire hole, 31-wireless power receiving module, 32-wireless power supply module, 61-first air bearing, 612-first radial hole, 613-first axial hole, 621-axial hole, 622-radial hole, 71-second air bearing, 72-air bearing bushing, 711-second radial hole, 721-wire passage hole. Detailed Implementation

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “left,” “right,” “front,” “rear,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are merely for ease of description and should not be construed as limiting the invention.

[0026] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this utility model are intended to cover non-exclusive inclusion; the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a particular order. In the specification, claims, and accompanying drawings of this utility model, when an element is referred to as "fixed to," "mounted to," "set on," or "connected to" another element, it can be directly or indirectly located on that other element. For example, when an element is referred to as "connected to" another element, it can be directly or indirectly connected to that other element.

[0027] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] See Figures 1-3 As shown, this utility model provides an ultrasonic air-bearing spindle unit, including a body 1, a spindle core 2, an energy transmission component 3, and a transducer component 5. The spindle core 2 is located in the inner cavity of the body 1 and can rotate relative to the body 1. The energy transmission component 3 is located between the inner side of the body 1 and the outer side of the spindle core 2.

[0029] A cutting tool 4 is installed in the inner cavity of the front end of the shaft core 2, and a transducer assembly 5 is installed on the outer periphery of the rear end of the shaft core 2. The transducer assembly 5 is connected to the energy transmission assembly 3.

[0030] In this invention, the rear end of the spindle core 2 is connected to an external drive mechanism, which drives the spindle core 2 to rotate. The energy transmission component 3 is connected to an external ultrasonic power supply to achieve ultrasonic energy transmission. Under the action of the transducer component 5, the spindle core 2 drives the tool 4 to perform ultrasonic vibration. The transducer component 5 is located on the outer periphery of the rear end of the spindle core 2, which can improve ultrasonic energy and achieve ideal ultrasonic amplitude, thereby improving the machining efficiency of the spindle.

[0031] Furthermore, a first air bearing assembly 6 and a second air bearing assembly 7 are sequentially arranged between the inner side of the main body 1 and the outer side of the shaft core 2. The first air bearing assembly 6 and the second air bearing assembly 7 are located on both sides of the energy transmission assembly 3, and the second air bearing assembly 7 is located between the energy transmission assembly 3 and the transducer assembly 5.

[0032] In this invention, by setting the first air bearing assembly 6 and the second air bearing assembly 7, an air film can be formed on the outer wall of the spindle core 2, thereby limiting the radial position of the spindle core 2, preventing the spindle core 2 from radially shifting during processing, and reducing friction to increase the rotational speed of the spindle core 2, thereby reducing grinding force and improving the processing accuracy of the spindle unit.

[0033] Furthermore, the first air bearing assembly 6 includes a first air bearing 61, the outer side wall of the first air bearing 61 is sealed to the inner side wall of the body 1, the first air bearing 61 is sleeved on the outer periphery of the shaft core 2, and a first gap is reserved between the inner side wall of the first air bearing 61 and the outer side wall of the shaft core 2, so that the shaft core 2 will not directly contact the first air bearing 61 during operation, which can reduce the frictional resistance when the shaft core 2 rotates, thereby effectively increasing the rotational speed of the shaft core 2.

[0034] The second air bearing assembly 7 includes a second air bearing 71 and an air bearing bushing 72. The outer side wall of the second air bearing 71 is sealed to the inner side wall of the body 1. The air bearing bushing 72 is provided between the second air bearing 71 and the shaft core 2. The inner side wall of the air bearing bushing 72 is fixedly connected to the outer side wall of the shaft core 2. A second gap is formed between the air bearing bushing 72 and the second air bearing 71. That is, the second air bearing 71 and the air bearing bushing 72 are sequentially sleeved radially around the outer periphery of the shaft core 2.

[0035] The main body 1 is provided with an axial air passage 101, which is connected to external compressed gas and is connected to the first gap and the second gap respectively.

[0036] During operation, compressed gas flows into the axial air passage 101 and enters the first gap and the second gap respectively. The compressed gas blown into the first gap forms a lubricating gas film with a certain load-bearing capacity and rigidity on the outside of the shaft core 2. At the same time, since the air in the first gap is flowing, the flowing gas can carry away the heat generated by the rotation of the shaft core 2, thus ensuring that the shaft core 2 can rotate stably. The compressed gas blown into the second gap also forms a lubricating gas film with a certain load-bearing capacity and rigidity in the second gap, further supporting the shaft core 2 and preventing the shaft core 2 from shifting during rotation.

[0037] Furthermore, the outer periphery of the shaft core 2 is provided with a first boss 21 and a second boss 22 in sequence along the axial direction. The first air bearing 6 is provided on one side of the first boss 21, and a third gap is formed between the first air bearing 6 and the corresponding side of the first boss 21.

[0038] The energy transmission assembly 3 includes a wireless power receiving module 31 and a wireless power supply module 32 arranged radially and at intervals along the shaft core 2. The wireless power receiving module 31 abuts and limits the second protrusion 22 of the shaft core 2. The wireless power supply module 32 is connected to the inner wall of the body 1, realizing reliable positioning of the wireless power receiving module 31 and the wireless power supply module 32, and ensuring the reliability of their installation and cooperation.

[0039] A channel is also formed between the wireless power receiving module 31 and the wireless power supply module 32. The channel corresponds to and is connected to the first gap. Compressed gas entering the first gap can also enter the channel to cool the energy transmission component 3. The wireless power receiving module 31 is connected to the transducer component 5, and the wireless power supply module 32 is connected to the ultrasonic power supply to achieve reliable transmission of ultrasonic energy.

[0040] Understandably, in other embodiments, the wireless power receiving module 31 and the wireless power supply module 32 can also be arranged along the axial direction of the core 2, that is, the wireless power receiving module 31 and the wireless power supply module 32 are powered axially, which can reduce the axial dimension of the main spindle unit and also ensure the transmission efficiency and reliability of ultrasonic energy.

[0041] Specifically, the first air bearing 61 is provided with multiple sets of first radial holes 612, each set having multiple first radial holes 612 arranged circumferentially. The two ends of each first radial hole 612 are connected to the axial air passage 101 and the first gap, respectively. The first air bearing 61 is also provided with a first axial hole 613, which is connected to all the first radial holes 612. Compressed gas flows into the axial air passage 101, then into the first radial holes 612 and the first axial holes 613, and then into the first gap and the third gap. Because the multiple first radial holes 612 are arranged circumferentially, compressed gas can be blown into the first gap on the outer side of the shaft core 2. The compressed gas blown into the third gap forms a lubricating gas film with a certain load-bearing capacity and rigidity within the third gap, thereby supporting the shaft core 2 and further preventing the shaft core 2 from shifting.

[0042] Specifically, the second air bearing 71 is provided with multiple sets of second radial holes 711, each set of which has multiple holes distributed circumferentially. All the second radial holes 711 are connected to the axial air passage 101 and the second gap. During operation, compressed gas flows into the second radial holes 711 from the axial air passage 101 and is then blown into the second gap. Since the second radial holes 711 are circumferentially distributed, the compressed gas blown into the second gap will form a lubricating gas film with a certain load-bearing capacity and rigidity in the second gap, which further supports the shaft core 2 and prevents the shaft core 2 from shifting during rotation.

[0043] Furthermore, the rear end of the main body 1 is provided with a rear end cover 8, which is located on the outer periphery of the transducer assembly 5 and serves to protect the transducer assembly 5. A connector 9 is provided at the rear end of the shaft core 2, which connects to an external drive mechanism to drive the shaft core 2 to rotate.

[0044] Specifically, the front end of the main body 1 is also provided with a front end cover 10, which is located on the outer periphery of the shaft core 2, and the inner side of the front end cover 10 is sealed and protected with the outer side of the shaft core 2.

[0045] The first air bearing assembly 6 also includes a thrust bearing 62, which is located on the outer periphery of the shaft core 2 and between the front end cover 10 and the first boss 21 of the shaft core 2. The thrust bearing 62 is also provided with an axial hole 621 and a radial hole 622 that communicate with the axial air passage 101. The thrust bearing 62 forms a fourth gap and a fifth gap with the front end cover 10 and the first boss 21, respectively. Compressed gas also enters the fourth gap and the fifth gap through the axial hole 621 and the radial hole 622, and forms a lubricating gas film with a certain load-bearing capacity and rigidity.

[0046] Since the thrust bearing 62 and the first air bearing 61 are located on both sides of the first boss 21, compressed gas is blown in through the third gap and the fifth gap, so that a supporting air film can be formed on both sides of the first boss 21 on the shaft core 2 during operation. The thrust bearing 62 further limits the axial position of the shaft core 2, thereby preventing the shaft core 2 from moving axially during rotation and ensuring the stability of the shaft core 2 installation. Moreover, the non-contact fit relationship can increase the rotational speed of the shaft core 2, thereby reducing the grinding force and improving the machining accuracy.

[0047] Understandable Figure 3 As shown, the front cover 10 is provided with a sealing air passage 110, which is connected to the fourth gap. After the gas in the fourth gap passes through the sealing air passage 110, it enters the space between the front cover 10 and the shaft core 2. The resulting air pressure is greater than the external atmospheric pressure, which prevents external impurities from entering between the front cover 10 and the shaft core 2, thus achieving a sealing protection between the front cover 10 and the shaft core 2.

[0048] In one embodiment, the air-bearing bushing 72 is provided with a wire-passing hole 721 for passing through the connecting wire between the wireless power receiving module 31 and the transducer assembly 5. This can shorten the length of the connecting wire and avoid the accumulation of connecting wires, which would affect the working efficiency of the spindle unit.

[0049] In another embodiment, see Figure 4 As shown, the rear end of the shaft core 2 is provided with a connected radial wire hole 22 and an axial wire hole 23. The connecting wire between the wireless power receiving module 31 and the transducer assembly 5 passes through their respective housings and then passes through the radial wire hole 22 and the axial wire hole 23 in sequence. This avoids machining wire holes on the air bearing bush 72, which would affect the performance of the air bearing bush 72 and the second air bearing 71, thereby ensuring the stability of the shaft core 2 installation.

[0050] The spindle unit provided by this utility model places the transducer assembly 5 on the outer periphery of the rear end of the spindle core 2, shortening the distance between it and the energy transmission assembly 3. The connecting wire between the transducer assembly 5 and the energy transmission assembly 3 can pass through the air bearing bush 72 or the rear end of the spindle core 2 without the need to process complex deep holes, resulting in better dynamic balance performance. A first air bearing assembly 6 and a second air bearing assembly 7 are also respectively provided between the body 1 and the spindle core 2. While retaining a large electrical power transmission capacity, this allows for high-precision assembly of the spindle, ensuring high rotational accuracy and thus improving the spindle's processing efficiency.

[0051] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. An ultrasonic air-bearing spindle unit, characterized in that: It includes a body, a shaft, an energy transmission assembly, and a transducer assembly. The shaft is located inside the body and is rotatable relative to the body. The energy transmission assembly is located between the inner side of the body and the outer side of the shaft. A cutting tool is provided in the inner cavity of the front end of the shaft core, and a transducer assembly is provided on the outer periphery of the rear end of the shaft core. The transducer assembly is electrically connected to the energy transmission assembly.

2. The ultrasonic air-bearing spindle unit according to claim 1, characterized in that: A first air bearing assembly and a second air bearing assembly are sequentially provided between the inner side of the main body and the outer side of the shaft core to form an air film on the outer periphery of the shaft core; the first air bearing assembly and the second air bearing assembly are respectively located on both sides of the energy transmission assembly, and the second air bearing assembly is located between the energy transmission assembly and the transducer assembly.

3. The ultrasonic air-bearing spindle unit according to claim 2, characterized in that: The first air bearing assembly includes a first air bearing sleeved on the outer periphery of the shaft core; The second air bearing assembly includes a second air bearing and an air bearing bushing that are radially sleeved on the outer periphery of the shaft core, the air bearing bushing being located between the shaft core and the second air bearing.

4. The ultrasonic air-bearing spindle unit according to claim 3, characterized in that: The outer periphery of the shaft core is provided with a first boss and a second boss in sequence along the axial direction, and the first air bearing is provided on one side of the first boss.

5. The ultrasonic air-bearing spindle unit according to claim 4, characterized in that: The energy transmission component includes a wireless power receiving module and a wireless power supply module arranged radially and spaced apart along the shaft core. The wireless power receiving module abuts and limits the second boss of the shaft core, and the wireless power supply module is connected to the inner wall of the body.

6. The ultrasonic air-bearing spindle unit according to claim 1, characterized in that: The rear end of the body is provided with a rear end cover, which is located on the outer periphery of the transducer assembly.

7. The ultrasonic air-bearing spindle unit according to claim 3, characterized in that: The front end of the main body is also provided with a front end cover, which is located on the outer periphery of the shaft core. An air blowing ring is also provided between the inner side of the front end cover and the outer side of the shaft core.

8. The ultrasonic air-bearing spindle unit according to claim 7, characterized in that: The first air bearing assembly further includes a thrust bearing, which is disposed on the outer periphery of the shaft core and located between the front end cover and the first boss on the outer periphery of the shaft core.

9. The ultrasonic air-bearing spindle unit according to claim 5, characterized in that: The air-bearing bushing is provided with a wire-passing hole for the connecting wire between the wireless power receiving module and the transducer assembly to pass through.

10. The ultrasonic air-bearing spindle unit according to claim 5, characterized in that: The rear end of the shaft is provided with a connected radial wire hole and an axial wire hole, and the connecting wire between the wireless power receiving module and the transducer assembly passes through the radial wire hole and the axial wire hole in sequence.

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