Spindle with split shaft core

Abstract

The utility model relates to the technical field of machining, and discloses a spindle with a split shaft core, which comprises a body, a shaft core arranged in an inner cavity of the body and an energy transmission component arranged between the outer wall of the shaft core and the inner wall of the body. A vibrating body is arranged in an inner cavity of the end of the shaft core, one end of the vibrating body is in clearance fit with the corresponding side wall of the shaft core and is sealed, and the end face of the other end of the vibrating body corresponds to the end face of the shaft core in position. A cutter handle is arranged in an inner cavity of the vibrating body, and a transducer assembly is arranged on the periphery of the vibrating body and connected with an energy transmission assembly. The rotating precision of the main shaft can be guaranteed, impurities such as cutting fluid can be prevented from entering the cavity where the transducer assembly is located, and the working reliability of the main shaft is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical processing technical field more particularly, relates to a main shaft of split type of axle core. BACKGROUND

[0002] Ultrasonic machining is widely used in non-metallic, hard and brittle materials and micro-hole and deep-hole machining because the tool tip has ultrasonic energy. In the current ultrasonic spindle structure, the vibration body is generally arranged in the end cavity of the axle core, connected with the end face of the axle core through the flange on the outer periphery of the vibration body, and the inner cavity of the vibration body is detachably installed with a tool holder. When the tool holder is replaced, it is difficult to ensure the rotation accuracy of the vibration body and the axle core. In addition, the outer periphery of the vibration body is also provided with a transducer assembly. Cutting fluid is easy to enter the inner cavity of the vibration body and enter the gap between the vibration body and the axle core to pollute the transducer assembly, affecting the working efficiency of the spindle. SUMMARY

[0003] The utility model discloses a main shaft of split type of axle core, which can ensure the rotation accuracy of the main shaft and improve the working efficiency of the main shaft.

[0004] To solve the above problems, the utility model adopts the technical scheme that:

[0005] The utility model provides a main shaft of split type of axle core, including the body, the axle core of setting in the inner chamber of body and energy transmission component, energy transmission component sets up between the outer wall of axle core and the inner wall of body,

[0006] The end cavity of the axle core is provided with a vibration body, one end of the vibration body is matched and sealed with the side wall corresponding to the axle core, and the end face of the other end of the vibration body corresponds to the end face of the axle core. The inner cavity of the vibration body is provided with a tool holder, and the outer periphery of the vibration body is provided with a transducer assembly, and the transducer assembly is connected with the energy transmission component.

[0007] Further, the end of the vibration body forms a connecting protrusion, the outer wall of the connecting protrusion is matched with the inner wall of the axle core in a gap, and the connecting protrusion is connected with the connecting outer wall of the axle core and / or the inner wall connected with the connecting protrusion is provided with a sealing structure.

[0008] Further, the inner cavity of the body is also provided with an air floating assembly, the air floating assembly includes a first air floating bearing, the first air floating bearing is sleeved on the outer periphery of the axle core and corresponds to the position of the vibration body, a first gap is reserved between the first air floating bearing and the axle core, and the energy transmission component is arranged on the side of the first air floating bearing away from the tool holder.

[0009] Further, the energy transmission assembly comprises a wireless power receiving module and a wireless power supply module arranged radially and spaced apart along the shaft core, the outer diameter of the wireless power receiving module is smaller than the inner diameter of the first air floating bearing, and the wireless power receiving module is connected with the shaft core; the wireless power supply module is attached to the opposite side wall of the first air floating bearing, and is connected with the inner wall of the body.

[0010] Further, the shaft core is provided with a wire hole, a connecting wire between the wireless power receiving module and the transducer assembly passes through the wire hole; a second sealing structure is arranged between the shaft core and the side wall of the wireless power receiving module, the second sealing structure is arranged on the outer periphery of the shaft core and located at the opening of the wire hole.

[0011] Further, the air floating assembly further comprises a thrust bearing, the outer periphery of the shaft core extends radially to form a limiting protrusion; the thrust bearing is sleeved on the outer periphery of the shaft core, and the thrust bearing and the first air floating bearing are arranged on the opposite sides of the limiting protrusion.

[0012] Further, the end of the vibration body corresponding to the end face of the shaft core forms a positioning boss, and the outer side wall of the positioning boss is in clearance fit with the inner side wall of the shaft core.

[0013] Further, the body is provided with an axial air channel in communication with the compressed gas, the first air floating bearing is provided with a plurality of first radial holes, the first radial holes are respectively in communication with the axial air channel and the first gap, and the first air floating bearing is further provided with a first axial hole in communication with the first radial hole.

[0014] Further, the thrust bearing is provided with a plurality of second axial holes, and the second axial holes are in communication with the axial air channel arranged on the body.

[0015] Further, a tool changing assembly is further included for clamping and tool changing operation of the tool shank.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] The utility model embeds the vibration body in the inner cavity of the shaft core, the end is in clearance fit with the shaft core and is sealed, can effectively integrate the vibration body and the shaft core, guarantees that the main shaft has higher rotary accuracy and dynamic deflection after automatic tool changing, and can avoid that impurities such as cutting fluid enter the cavity where the transducer assembly is arranged along the inner cavity of the vibration body, guarantees the reliability of the main shaft work, also improves the working efficiency of the main shaft. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the scheme in the utility model, the following will be a simple introduction to the drawings needed to be used in the embodiment description, obviously, the following description of the drawings is some embodiments of the utility model, for those skilled in the art, without creative labor, other drawings can also be obtained according to these drawings. Among them:

[0019] Figure 1 It is another partial view of the main shaft of the split type shaft core in the utility model.

[0020] Figure 2 It is another partial view of the main shaft of the split type shaft core in the utility model.

[0021] Wherein, 1-body, 2-shaft core, 3-energy transmission assembly, 4-vibration body, 5-tool holder, 6-transducer assembly, 7-air float assembly, 8-end cover, 101-axial air channel, 14-pull claw, 15-pull rod, 21-limiting convex part, 31-wireless power receiving module, 32-wireless power supply module, 41-positioning boss, 42-connection convex part, 43-second sealing structure, 71-first air float bearing, 712-first radial hole, 713-first axial hole, 72-thrust bearing, 721-second axial hole. DETAILED DESCRIPTION

[0022] 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 the utility model belongs; the terms used in the specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model, for example, the terms "length", "width", "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or position shown in the drawings, which is only for the convenience of description and cannot be understood as a limitation of the technical scheme.

[0023] The terms "include" and "have" and any variations thereof in the specification and claims of the utility model and the above drawing description are intended to cover non-exclusive inclusion; the terms "first", "second" and the like in the specification and claims of the utility model or the above drawing description are used to distinguish different objects and are not used to describe a specific order. In the specification and claims of the utility model and the above drawing description, when an element is referred to as "fixed to" or "mounted to" or "provided on" or "connected to" another element, it can be directly or indirectly on the other element. For example, when an element is referred to as "connected to" another element, it can be directly or indirectly connected to the other element.

[0024] Furthermore, reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the other embodiments. It is explicitly contemplated that embodiments described herein can be combined with each other, unless otherwise specifically stated.

[0025] Referring to Figure 1 As shown in the drawings, the utility model provides a kind of main shaft of split type shaft core, including body 1, shaft core 2 and energy transmission component 3 of the inner cavity of body 1 being arranged, shaft core 2 can rotate in the inner cavity of body 1;Energy transmission component 3 is arranged between the outer wall of shaft core 2 and the inner wall of body 1;

[0026] The end inner cavity of shaft core 2 is provided with vibration body 4, one end of vibration body 4 is matched with the side wall gap of shaft core 2 and sealed, and the end face of the other end of vibration body 4 corresponds with the end face position of shaft core 2;The inner cavity of vibration body 4 is provided with tool holder 5, and the outer periphery of vibration body 4 is provided with transducer assembly 6, which is connected with energy transmission component 3, to drive tool holder 5 to realize ultrasonic machining.

[0027] Specifically, vibration body 4 is completely embedded in the end inner cavity of shaft core 2, and the end of vibration body 4 is connected with shaft core 2, which can ensure the rotation accuracy of vibration body 4 and shaft core 2 after replacing tool holder 5, i.e. improve the working accuracy of the whole main shaft. The connection end between vibration body 4 and shaft core 2 is sealed to prevent impurities such as cutting fluid from entering the cavity where transducer assembly 6 is located through the inner cavity of vibration body 4 and the gap between vibration body 4 and shaft core 2, thereby ensuring the reliability of the main shaft.

[0028] In an embodiment, the end of vibration body 4 forms a connecting protrusion 42, the outer wall of connecting protrusion 42 is matched with the inner wall of shaft core 2 in a gap, and a sealing structure is arranged between the outer wall of connecting protrusion 42 and the inner wall of shaft core 2 to realize sealing between vibration body 3 and shaft core 2.

[0029] Specifically, a sealing groove is provided on the outer peripheral surface of connecting protrusion 42 connected with shaft core 2 and / or the end surface of connecting protrusion 42 matched with shaft core 2 in a gap, and a first sealing structure 32 is arranged in the sealing groove to realize radial sealing or axial sealing between vibration body 4 and shaft core 2. It can be understood that the sealing groove can also be arranged on the inner side wall of shaft core 2 matched with connecting protrusion 42 in a gap, and a sealing structure is also arranged in the sealing groove to ensure the sealing between vibration body 4 and shaft core 2 and prevent impurities such as cutting fluid from entering the cavity where transducer assembly 6 is located.

[0030] In an embodiment, the end of the vibration body 4 corresponding to the end face of the shaft core 2 forms a positioning boss 41, the outer side wall of the positioning boss 41 is attached to and connected with the inner side wall of the shaft core 2, thereby limiting the vibration body 4 and ensuring the rotation accuracy of both the vibration body 4 and the shaft core 2.

[0031] In an embodiment, the inner cavity of the body 1 is further provided with an air floating assembly 7, the air floating assembly 7 is sleeved on the outer periphery of the shaft core 2, the air floating assembly 7 corresponds to the position of the vibration body 3, and is used to form an air film on the outer periphery of the shaft core 2 to prevent the shaft core 2 from moving radially during rotation. The energy transmission assembly 3 is arranged on the side of the air floating assembly 7 away from the tool holder 5, thereby shortening the distance between the energy transmission assembly 3 and the transducer assembly 6.

[0032] In the embodiment, the air floating assembly 7 can form an air film on the outer side wall of the shaft core 2 to limit the radial position of the shaft core 2, prevent the shaft core 2 from deviating radially during machining, and reduce the friction to improve the rotation speed of the shaft core 2, thereby reducing the grinding force and improving the machining accuracy of the main shaft. The energy transmission assembly 3 is arranged on one side of the air floating assembly 7, thereby greatly shortening the distance between the energy transmission assembly 3 and the transducer assembly 6, avoiding the need to process a complex deep hole on the shaft core 2, improving the dynamic balance performance, not occupying the space of the central through hole of the shaft core 2, and improving the structural rigidity of the shaft core 2.

[0033] In an embodiment, the air floating assembly 7 includes a first air floating bearing 71, the outer side wall of the first air floating bearing 71 is sealingly connected with the inner side wall of the body 1, the first air floating bearing 71 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 floating bearing 71 and the outer side wall of the shaft core 2, so that the shaft core 2 does not directly contact the first air floating bearing 71 during operation, the friction resistance of the shaft core 2 during rotation is reduced, and the rotation speed of the shaft core 2 is effectively improved.

[0034] The body 1 is provided with an axial air channel 101, one end of the axial air channel 101 is in communication with the outside compressed gas, and a plurality of groups of first radial holes 712 are arranged on the first air floating bearing 71, each group of first radial holes 712 is circumferentially distributed, and the two ends of the first radial hole 712 are respectively in communication with the axial air channel 101 and the first gap.

[0035] During operation, the compressed gas flows into the axial air channel 101, then flows into the first radial hole 712, and then blows into the first gap. Since the plurality of first radial holes 712 are circumferentially distributed, the compressed gas can be blown into the first gap on the outer side of the shaft core 2, and the compressed gas blown into the first gap can form a lubricating air film with certain bearing capacity and rigidity on the outer side 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, thereby ensuring the stable rotation of the shaft core 2.

[0036] In an embodiment, the energy transmission assembly 3 comprises a wireless power receiving module 31 and a wireless power supply module 32 arranged radially and spaced apart along the shaft core 2, the wireless power receiving module 31 is fixed to the outer side wall of the shaft core 2, and the outer diameter of the wireless power receiving module 31 is smaller than the inner diameter of the first air floating bearing 71. One end of the side wall of the wireless power supply module 32 is attached to the side wall opposite to the first air floating bearing 71, and the other end of the side wall of the wireless power supply module 32 is attached to the positioning protrusion 102 of the inner wall of the body 1, and is connected to the inner wall of the body 1, thereby realizing reliable positioning of the wireless power receiving module 31 and the wireless power supply module 32, and ensuring the reliability of the installation and cooperation of the two.

[0037] A channel is also formed between the wireless power receiving module 31 and the wireless power supply module 32, which corresponds to and communicates with the position of the first gap, and the compressed gas entering the first gap can also enter the channel, thereby realizing cooling of the energy transmission assembly 3.

[0038] In this embodiment, the wireless power supply module 32 is connected to an external ultrasonic power supply during operation, and the wireless power supply module 32 and the wireless power receiving module 31 are gap-cooperated to realize wireless transmission of energy, thereby realizing ultrasonic machining of the main shaft. The wireless power supply module 32 and the wireless power receiving module 31 are both designed in a modular manner, which facilitates installation and maintenance, and are arranged radially along the shaft core 2, thereby avoiding interference with the first air floating bearing 71 while retaining a large amount of electrical power transmission, and realizing high-precision assembly of the main shaft, thereby ensuring high rotation precision of the main shaft.

[0039] In an embodiment, a wire hole 201 is provided on the shaft core 2, and a connecting wire between the wireless power receiving module 31 and the transducer assembly 6 passes through the wire hole 201; a second sealing structure 43 is provided between the shaft core 2 and the side wall of the wireless power receiving module 31, and the second sealing structure 43 is arranged on the outer periphery of the shaft core 2 and located at the opening of the wire hole 201, thereby sealing the shaft core 2 and the energy transmission assembly 3 and fixing the connecting wire.

[0040] In this embodiment, the second sealing structure 43 is arranged between the shaft core 2 and the wireless power receiving module 31, and the second sealing structure 43 is arranged in the inner cavity of the first air floating bearing 71, thereby avoiding impurities entering the cavity where the transducer assembly 6 is located through the wire hole 201; at the same time, the connecting wire between the transducer assembly 6 and the wireless power receiving module 31 is fixed, thereby avoiding disconnection of the connecting wire from the wireless power receiving module 31 due to large centrifugal force during high-speed operation.

[0041] In an embodiment, the air floating assembly 7 further comprises a thrust bearing 22, and the outer periphery of the shaft core 2 extends radially to form a limiting protrusion 21; the thrust bearing 72 is sleeved on the outer periphery of the shaft core 2, and the thrust bearing 72 and the first air floating bearing 71 are respectively arranged on the two sides opposite to the limiting protrusion 21, and the second gap and the third gap are respectively reserved between the side wall of the limiting protrusion 21 and the thrust bearing 72. The axial position of the shaft core 2 is limited by the thrust bearing 72, so as to prevent the shaft core 2 from moving axially during rotation.

[0042] The first air floating bearing 71 is further provided with a first axial hole 713, and the first axial hole 713 is communicated with all the first radial holes 712. During work, the compressed gas flowing in from the axial air channel 101 then flows into the first axial hole 713, and finally blows into the third gap. Since the first axial hole 713 is circumferentially distributed, the compressed gas blowing into the third gap will form a lubricating gas film with certain bearing capacity and rigidity in the third gap, thereby supporting the shaft core 2 and preventing the shaft core 2 from deviating away from the end cover 7.

[0043] Specifically, as shown in Figure 1 、 2 The body 1 is provided with an end cover 8 at one end, the end of the shaft core 2 provided with the tool handle 5 passes through the end cover 8 and extends out of the end surface of the body 1, one end of the thrust bearing 72 is sealingly connected with the end cover 8, and a plurality of second axial holes 721 are circumferentially arranged on the thrust bearing 72, and the second axial holes 721 are respectively communicated with the axial air channel 101 and the second gap. During work, the compressed gas flows into the second axial hole 721 through the axial air channel 101, and then blows into the second gap. Since the second axial hole 721 is circumferentially distributed, the compressed gas blowing into the second gap will form a lubricating gas film with certain bearing capacity and rigidity in the second gap, thereby supporting the shaft core 2 and preventing the shaft core 2 from deviating towards the end cover 8.

[0044] By arranging the second gap and the third gap, the left and right sides of the shaft core 2 can form a supporting gas film during work, thereby preventing the shaft core 2 from moving axially. Moreover, the non-contact matching relationship can improve the rotating speed of the shaft core 2, thereby reducing the grinding force and improving the machining precision.

[0045] In the embodiment, a damping plug is arranged in the first radial hole 712, the first axial hole 713 and the second axial hole 721. By arranging the damping plug, the air flow rate flowing into the first gap, the second gap and the third gap can be controlled, and the gas pressure flowing in is ensured to be the same, thereby further improving the stability of the rotation of the shaft core 2. During work, the compressed gas flows into the first gap, the second gap and the third gap at the same time, thereby limiting the shaft core 2 in the axial and radial directions at the same time, ensuring that the shaft core 2 can rotate at a high speed in the body 1, and improving the machining precision.

[0046] The main shaft further comprises a tool changing assembly for tool changing operation of the tool holder 5. The tool changing assembly comprises a pull rod 9, a pull claw 10 and a tool changing drive unit (not shown in the figure), one end of the pull rod 9 is detachably connected with the tool changing drive unit, the other end of the pull rod 9 extends into the shaft core 2 and is detachably connected with the tool holder 5 through the pull claw 10. The pull claw 10 is used for clamping the tool holder 5, and the tool changing drive unit is used for driving the pull rod 9 to install and dismount the tool holder 5, so as to facilitate replacement of the tool holder 5.

[0047] The shaft core split type main shaft provided by the utility model embeds the vibration body 4 in the inner cavity of the shaft core 2, and the end part is in gap cooperation with the shaft core 2 and is sealed, can effectively combine the vibration body 4 and the shaft core 2 into one, guarantees that the main shaft has higher rotary precision and dynamic deflection after automatic tool changing, and can avoid impurities such as cutting fluid along the inner cavity of the vibration body 4 into the cavity where the transducer assembly 6 is located, guarantees the reliability of the main shaft work. The energy transmission assembly 3 is arranged at the front end of the shaft core 2, can shorten the distance between the energy transmission assembly 3 and the transducer, avoid machining a longer wire hole on the shaft core 2, and improve the structural rigidity and dynamic balance performance of the shaft core 2.

[0048] The above embodiment is the preferred implementation manner of the utility model, but the implementation manner of the utility model is not limited by the above embodiment, and any change, modification, replacement, combination and simplification made without departing from the spirit and principle of the utility model should be equivalent replacement manner, and all are included in the protection scope of the utility model.

Claims

1. A spindle having a split shaft core, characterized by: The energy transmission assembly is arranged between the outer wall of the shaft core and the inner wall of the body; The end cavity of the shaft core is provided with a vibration body, one end of the vibration body is in gap fit with the corresponding side wall of the shaft core and is sealed, and the end face of the other end of the vibration body corresponds to the end face position of the shaft core; the inner cavity of the vibration body is provided with a tool holder, and the outer periphery of the vibration body is provided with a transducer assembly connected with the energy transmission assembly.

2. The split spindle of claim 1, wherein: The end of the vibration body forms a connecting convex part, the outer wall of the connecting convex part is in gap fit with the inner wall of the shaft core, and the connecting convex part is provided with a sealing structure on the connecting outer wall of the shaft core and / or the inner wall connected with the connecting convex part of the shaft core.

3. The spindle according to claim 1 or 2, characterized in that: The inner cavity of the body is further provided with an air floating assembly, the air floating assembly comprises a first air floating bearing, the first air floating bearing is sleeved on the outer periphery of the shaft core and corresponds to the position of the vibration body, a first gap is reserved between the first air floating bearing and the shaft core, and the energy transmission assembly is arranged on the side of the first air floating bearing away from the tool holder.

4. The split spindle of claim 3, wherein: The energy transmission assembly comprises a wireless power receiving module and a wireless power supply module arranged radially and spaced apart along the shaft core, the outer diameter of the wireless power receiving module is smaller than the inner diameter of the first air floating bearing, and the wireless power receiving module is connected with the shaft core; the wireless power supply module is attached to the side wall opposite to the first air floating bearing, and is connected with the inner wall of the body.

5. The split spindle of claim 4, wherein: The shaft core is provided with a wire hole, a connecting wire between the wireless power receiving module and the transducer assembly passes through the wire hole; a second sealing structure is arranged between the side wall of the shaft core and the wireless power receiving module, and the second sealing structure is arranged on the outer periphery of the shaft core and located at the opening of the wire hole.

6. The spindle of claim 3 wherein: The air floating assembly further comprises a thrust bearing, the outer periphery of the shaft core extends radially to form a limiting convex part; the thrust bearing is sleeved on the outer periphery of the shaft core, and the thrust bearing and the first air floating bearing are arranged on opposite sides of the limiting convex part.

7. The split spindle of claim 1, wherein: The end of the vibration body corresponding to the end face of the shaft core forms a positioning boss, and the outer side wall of the positioning boss is in gap fit with the inner side wall of the shaft core.

8. The spindle of claim 3 wherein: An axial air channel communicating with compressed gas is arranged in the body, a plurality of first radial holes are arranged on the first air floating bearing, and the first radial holes respectively communicate with the axial air channel and the first gap; a first axial hole communicating with the first radial hole is further arranged on the first air floating bearing.

9. The spindle of claim 6 wherein: A plurality of second axial holes are arranged on the thrust bearing, and the second axial holes communicate with the axial air channel arranged on the body.

10. The split spindle of claim 1, wherein: The tool holder is further clamped and replaced by a tool replacing assembly.

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