CN110561203B - Distributed wireless energy transmission rotary ultrasonic machining device - Google Patents

Distributed wireless energy transmission rotary ultrasonic machining device Download PDF

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Publication number
CN110561203B
CN110561203B CN201910712109.0A CN201910712109A CN110561203B CN 110561203 B CN110561203 B CN 110561203B CN 201910712109 A CN201910712109 A CN 201910712109A CN 110561203 B CN110561203 B CN 110561203B
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magnetic
magnetic core
primary
ring
amplitude transformer
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CN110561203A (en
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梅德庆
章盛祥
汪延成
张若愚
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Zhejiang University ZJU
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Zhejiang University ZJU
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B06GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06BMETHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/04Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with electromagnetism
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B06GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06BMETHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezo-electric effect or with electrostriction
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B06GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06BMETHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B3/00Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B3/02Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency involving a change of amplitude
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • B24B1/04Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes subjecting the grinding or polishing tools, the abrading or polishing medium or work to vibration, e.g. grinding with ultrasonic frequency
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00Component parts such as frames, beds, carriages, headstocks
    • B24B41/04Headstocks; Working-spindles; Features relating thereto

Abstract

The invention discloses a distributed wireless energy transmission rotary ultrasonic processing device. The piezoelectric ceramic is arranged in the inner cavity of the cutter handle and is fixed on the amplitude transformer through an aluminum pad and a pressing cap; the primary magnetic core is connected with the outer edge of the electric spindle of the machine tool and is connected with the secondary magnetic ring through a loose coupling system with a certain gap; the secondary magnetic ring is formed by connecting a plurality of coil structures in series, and each coil is opposite to the primary magnetic core within a certain angle range. The invention realizes the non-contact transmission of ultrasonic energy through reasonable design, so that the rotary ultrasonic processing is not limited to the low-speed state of contact transmission any more; the device can be applied to the automatic tool changing requirements of large machine tool equipment such as a machining center and the like by adopting the reasonable size parameters of the transmitting block; the distributed secondary magnetic ring structure enables the relative areas of the primary magnetic core and the secondary magnetic ring to be consistent all the time, greatly improves the coupling coefficient of non-contact energy transmission, improves the energy transmission efficiency, and solves the problem of energy loss of non-contact energy transmission in rotary ultrasonic processing.

Description

Distributed wireless energy transmission rotary ultrasonic machining device
Technical Field
The invention relates to the field of rotary ultrasonic processing, in particular to a distributed wireless energy transmission rotary ultrasonic processing device.
Background
The rotary ultrasonic machining applies high-frequency ultrasonic vibration to the cutter through the ultrasonic transducer while the cutter rotates and feeds at a high speed, so that the periodic separation of the cutter and a workpiece and the intermittent cutting of materials are realized. The machining method is proved to have good effect in cutting of hard and brittle materials such as monocrystalline silicon, sapphire and the like, and is widely applied to the fields of optical manufacturing, aerospace, biomedical treatment and the like.
High-frequency ultrasonic vibration signals of the cutter in the rotary ultrasonic machining are required to be transmitted into an ultrasonic transducer in the cutter handle through an ultrasonic generator. How to transmit high-frequency ultrasonic electric signals to an ultrasonic transducer rotating at high speed of a random bed is a key technical difficulty in rotary ultrasonic processing.
Currently, the common energy transfer techniques include: through the contact of the carbon brush slip ring and the ultrasonic transducer, the method has the friction between the slip ring and the transducer, so that the heat productivity of the carbon brush slip ring is larger, and the rotating speed of a machine tool cannot be increased without limit; the method can effectively solve the problems of frictional heating, rotating speed limitation and the like of contact type energy transmission, but due to the limitation of automatic tool changing of a processing center, the effective relative area between two mutually-contacted electromagnetic couplers is small, so that the problems of low electric energy transmission efficiency, easy heating of the non-contact electromagnetic couplers and the like exist.
Disclosure of Invention
In order to make up for the deficiency in the prior art, the invention aims to provide a distributed rotary ultrasonic non-contact energy transmission device with high energy transmission efficiency, which can meet the requirement of automatic tool changing of a machining center and realize ultrasonic wireless energy transmission under high-frequency rotation; and high-efficiency electric energy transmission can be realized, and the problems of heating of the non-contact electromagnetic coupler and the like are solved.
The technical scheme adopted by the invention is as follows:
the ultrasonic grinding head comprises an ultrasonic grinding head, an amplitude transformer, a primary magnetic structure, a secondary magnetic structure and a cutter handle shell, wherein the middle part of the amplitude transformer is hermetically connected to the opening end surface of the cutter handle shell through a flange connecting structure, the two ends of the amplitude transformer positioned inside and outside the cutter handle shell are respectively used as the inner end and the outer end of the amplitude transformer, piezoelectric ceramics are fixed on the amplitude transformer between the flange and the inner end, and the outer end of the amplitude transformer is coaxially and fixedly connected with the ultrasonic grinding head.
The outer peripheral surface of the knife handle shell is sequentially sleeved with a primary magnetic structure and a secondary magnetic structure along the axis direction, the primary magnetic structure is fixed on the machine tool and does not move along with the knife handle shell, and the secondary magnetic structure is fixed on the knife handle shell and moves along with the knife handle shell synchronously. The secondary magnetic structure comprises a secondary magnetic ring protection shell, secondary magnetic cores and secondary coils, wherein the inner circumferential surface of the secondary magnetic ring protection shell is fixedly connected to the outer circumferential surface of the cutter handle shell, an annular opening cavity is formed in the secondary magnetic ring protection shell along the circumferential direction, a plurality of identical secondary magnetic cores are sequentially embedded in the annular opening cavity along the complete circumferential direction of the secondary magnetic ring protection shell, the bending radian of each secondary magnetic core is matched with that of the opening cavity at the corresponding embedding position, and two side surfaces of each secondary magnetic core are respectively in contact connection with the side surfaces of the adjacent secondary magnetic cores. The secondary magnetic cores are sequentially and tightly connected to form a complete secondary magnetic ring, each secondary magnetic core is wound with a secondary coil, and all the secondary coils are sequentially connected in series and then connected with the piezoelectric ceramics.
The primary magnetic structure comprises a primary magnetic core protective shell, a primary magnetic core and a primary coil, the outer peripheral surface of the primary magnetic core protective shell is fixed on a machine tool, the inner peripheral surface of the primary magnetic core protective shell is not connected with the outer peripheral surface of the tool handle shell, an arc-shaped opening cavity is formed in the circumferential direction of the primary magnetic core protective shell, the arc-shaped opening cavity is opposite to the opening surface of the annular opening cavity of the secondary magnetic ring protective shell, a single primary magnetic core is fixedly embedded in the arc-shaped opening cavity, the structure of the primary magnetic core is the same as that of a single secondary magnetic core, the primary coil is wound on the primary magnetic core in the same manner as that of the secondary coil on the secondary magnetic core, the end surface of the primary magnetic core, facing the opening surface of the arc-shaped opening cavity, serves as a primary magnetic ring surface, the end surface of, the area of the positive phase in the secondary magnetic ring surface relative to the area of the primary magnetic ring surface is always kept the same at any time when the knife handle shell drives the secondary magnetic ring to rotate. The area is always kept the same, which means that the normal phase in the secondary magnetic ring surface is always in mirror symmetry with the primary magnetic ring surface relative to the end surface part of the primary magnetic ring surface in the rotating process of the secondary magnetic ring surface, namely, the area size and the area shape which are relatively overlapped are always kept the same.
The secondary coil is wound on the secondary magnetic core in a specific mode that: each secondary magnetic core is provided with an arc-shaped groove which is through in the circumferential direction, and the secondary coil is wound at the bottom of the groove of the secondary magnetic core along the circumferential extension direction of the groove; the notch direction of the arc-shaped groove is the same as the opening direction of the opening cavity of the secondary magnetic ring protective shell, the depth of the arc-shaped groove at least can accommodate the secondary coil, every two adjacent arc-shaped grooves are communicated to form a complete annular groove, the annular end face of the secondary magnetic ring is divided into an inner annular ring and an outer annular ring which are concentric by the annular groove, the inner annular ring and the outer annular ring form a concentric double-ring surface, and the concentric double-ring surface is used as a secondary magnetic ring surface.
The shape of the end part magnetic core of each magnetic core coil is consistent with that of the magnetic core coil of the primary magnetic core, and the relative areas of the primary magnetic core and the secondary magnetic ring are guaranteed to be consistent at any time when the main shaft rotates. The bottom parts of the two circumferential ends of the secondary magnetic core are respectively processed with a trapezoidal chamfer angle for winding, so that the windings of the adjacent secondary coils are not influenced with each other. As shown in fig. 3, the bottom of each distributed core in the secondary magnetic loop is left with a trapezoidal chamfer of the winding allowing the coil to pass through the bottom of the series connected distributed cores.
The amplitude transformer part between the inner end and the flange is sequentially sleeved with piezoelectric ceramics and then sequentially sleeved with an aluminum pad and a pressure cap, and the inner end of the amplitude transformer is in threaded fastening connection with the central fixed rod, so that the piezoelectric ceramics are compressed and fixed. The primary coil transmits ultrasonic energy to the secondary coil, the secondary coil transmits the ultrasonic energy to the piezoelectric ceramic through a lead, the piezoelectric ceramic generates high-frequency vibration, and the amplitude transformer amplifies the high-frequency vibration of the piezoelectric ceramic and then transmits the amplified high-frequency vibration to the ultrasonic grinding head.
The other end of the amplitude transformer is coaxially and fixedly connected with the ultrasonic grinding head through a nut clamping spring piece, the nut clamping spring piece comprises a nut and a clamping spring, the axial two ends of the clamping spring respectively clamp the end part of the ultrasonic grinding head and the end part of the amplitude transformer, and the nut clamps and fixes the amplitude transformer and the ultrasonic grinding head.
The axial distance between the primary magnetic structure and the secondary magnetic structure is adjusted through the position of the primary magnetic structure fixed on the machine tool.
The opening end face of the cutter handle shell is circumferentially provided with a threaded hole serving as a flange connecting hole, the middle part of the amplitude transformer is sleeved with a flange connecting structure, and the amplitude transformer is fixedly connected to the cutter handle shell through the flange connecting structure.
The invention is provided with a primary magnetic core and a secondary magnetic ring to form a non-contact electromagnetic coupling arrangement mode; and the secondary magnetic ring is split into a plurality of magnetic core coils which are connected in series, and the plurality of secondary magnetic cores form a distributed secondary magnetic ring. The device is characterized in that the non-contact transmission of electric energy is realized, the energy transfer efficiency is greatly improved, and the problem that the non-contact electromagnetic coupler cannot be symmetrically designed due to automatic tool changing of a machining center, so that the energy cannot be output to the maximum is solved. Compared with a carbon brush slip ring and other rotary ultrasonic machining structures, the non-contact energy transmission mode avoids direct contact between an ultrasonic power supply and a machining center electric spindle in the electric energy transmission process, the rotating speed of a machine tool can be improved without limitation, the structural design of the distributed secondary magnetic ring can ensure that the relative areas of the primary magnetic core and the secondary magnetic ring are kept consistent at any time when the machining center spindle rotates at a high speed, and therefore the energy transfer efficiency of non-contact energy transmission is greatly improved.
The invention has the beneficial effects that:
(1) through the asymmetric wireless energy transmission structure, the wireless transmission of ultrasonic energy is realized, the automatic tool changing requirement of specific processing equipment such as a processing center is met, and the rotating speed limit of the processing equipment is released, so that the rotating speed of the main shaft can be increased without limitation.
(2) Through the internal structural design of the distributed magnetic rings, the problems of low energy transmission efficiency, large heat productivity of the magnetic cores and the like caused by unequal relative areas of the primary magnetic cores and the secondary magnetic cores under an asymmetric wireless energy transmission structure are solved, so that the overall energy transmission capability is improved, and the working state of rotary ultrasonic machining is more stable.
(3) The design radian of the distributed structure is closely related to processing equipment, and the radian of the distributed magnetic core structure can be adjusted according to the tool changing requirements of different processing equipment, so that the method can be used in a processing center without limitation and can also be applied to other processing equipment.
Drawings
Fig. 1 is a schematic view of the assembly structure of the present invention.
Fig. 2 is a schematic exploded view of the present invention.
Fig. 3 is a schematic diagram of a non-contact energy transfer structure of the present invention.
In the figure, 1-ultrasonic grinding head, 2-nut spring clamping piece, 3-amplitude transformer, 4-secondary magnetic structure, 5-primary magnetic structure, 6-handle shell, 7-fixing nut, 8-piezoelectric ceramic, 21-nut, 22-spring clamp, 81-aluminum pad, 82-pressing cap, 83-central fixing rod, 41-secondary magnetic ring protective shell, 42-secondary magnetic core, 43-secondary coil, 51-primary magnetic core protective shell, 52-primary magnetic core, 53-primary coil, 61-threaded hole, 62-cutter clamping groove and 63-handle top end.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1 and 2, the top end 63 of the tool holder 6 is a fixed structure connected with a main shaft of a machining center, and the top of the tool holder 6 is provided with a blind rivet structure for being fixedly connected with the main shaft. The blind rivet construction depends on different machining centers. The primary magnetic structure 5 and the secondary magnetic structure 4 are sequentially arranged on the peripheral surface of the cutter handle 6 from top to bottom; the lower part of the knife handle 6 is provided with an axial stepped limiting structure for limiting the axial movement of the secondary magnetic ring protective shell 41. The secondary magnetic ring protection shell 41 is fixed with the knife handle through AB glue, and the top of the secondary magnetic ring protection shell is connected with the limiting structure of the knife handle 6. A cutter clamping groove 62 for automatic cutter changing is formed in the middle of the cutter handle 6, and the requirement of a machining center for automatic cutter changing is met.
A threaded hole 61 is reserved at the bottom of the handle 6, the threaded hole 61 is used for fixing the amplitude transformer 3, a prefabricated hole in a flange of the amplitude transformer 3 is fixedly connected with the handle 6 through the matching of the fixing nut 7 and a threaded hole at the bottom of the handle, the inner diameter of the bottom of the handle 6 keeps close fit with the outer diameter of the flange of the amplitude transformer 3, and the sealing performance of the whole device after the amplitude transformer 3 is assembled is guaranteed. The secondary magnetic ring 4 is internally provided with 5 distributed magnetic core structures 42 which are sealed in a secondary magnetic ring protective shell 41 by AB glue, the lower part of the handle 6 is provided with a stepped limiting structure, the secondary magnetic ring protective shell 41 is fixed with the handle by AB glue while the top part is connected with the limiting structure of the handle 6, a primary magnetic core 52 in the primary magnetic core 5 is sealed in a primary magnetic core protective shell 51 by AB glue, the primary magnetic core protective shell 51 is fixed by a fixing device fixed at the outer edge of a main shaft of a processing center, a certain air gap is reserved between the lower edge of the primary magnetic core 5 and the upper edge of the secondary magnetic ring 4, the primary magnetic core 5 can be fixed when the secondary magnetic ring 4 rotates along with the main shaft and the size of the air gap can be adjusted by the fixing device at the outer edge of the main shaft, the four pieces of piezoelectric ceramics 8 and an aluminum pad 81 for heat dissipation are fixedly connected on the amplitude transformer 6 by a central, the clamping spring 22 is used for clamping the amplitude transformer 3 and the grinding head 1 at two axial ends respectively, threads are processed on the amplitude transformer 3, the nut 21 is fastened to the amplitude transformer 3 through the matching of the internal threads and the external threads, and the clamping spring 22 is clamped and contracted, so that the grinding head 1 is fixedly connected with the transducer through the nut clamping spring 2.
As shown in fig. 2, the end of the ultrasonic horn 3 connected to the grinding head 1 is a lower end, the diameter of the lower end of the ultrasonic horn 3 is gradually reduced downward, the bottom of the lower end is provided with a spring clamping groove, and the tail end of the horn 3 is connected to cutters such as the grinding head 1 through ER series nuts and springs.
The ultrasonic amplitude transformer 3 between the connecting flange and the upper end is provided with a bulge which is matched and installed with the piezoelectric ceramics, the surface shape of the bulge is consistent with that of the piezoelectric ceramics, the upper end of the piezoelectric ceramics 8 is assembled with a copper pad for heat dissipation, the upper end of the copper pad is assembled with a pressing cap 82 for fixing, and the piezoelectric ceramics 8, the aluminum pad and the pressing cap are sequentially installed and then are screwed down by a central fixing rod 4 for fixing.
As shown in fig. 2 and 3, the primary magnetic core 5 is fixed to the spindle stator of the machine tool by a fixing device, and a certain gap is maintained between the secondary magnetic ring and the primary magnetic core. The primary magnetic core 5 comprises a primary magnetic core protective shell 51, a primary magnetic core 52 and a primary coil 53, the section of the primary magnetic core 52 in the circumferential direction is U-shaped, the radian enclosed by the axis of the knife handle is 72 degrees, the primary coil 53 is circumferentially wound at the bottom of the U-shaped groove and embedded in the primary magnetic core protective shell 51 together with the primary magnetic core 52, a wire hole is reserved on the outer side wall of the primary magnetic core protective shell 51 to transmit ultrasonic electric energy into the primary coil 53,
the secondary magnetic ring 4 comprises a secondary magnetic ring protective shell 41, distributed magnetic cores 42 and secondary coils 43, the cross sections of the distributed magnetic cores 42 in the circumferential direction are U-shaped, the radian enclosed by the axes of the corresponding tool handles is 72 degrees, the distributed magnetic cores 42 enclose a whole circle together, the secondary coils 43 are wound at the bottoms of the U-shaped grooves of the distributed magnetic cores 42 in the circumferential direction, the adjacent coils are kept in series connection, and wire holes are reserved in the inner side wall of the secondary magnetic ring protective shell 41 to transmit ultrasonic electric energy into piezoelectric ceramics. In addition, the primary core 52 and the distributed core 42 are made of PC40 ferrite material with a relative conductivity of 2000, the primary coil 53 and the secondary coil 43 are made of enameled wires with a diameter of 0.5mm by winding, and the number of turns is 80.
In specific implementation, the primary magnetic core protective shell 51 and the secondary magnetic ring protective shell 41 are made of aluminum protective shells, so that the safety problem caused by the falling of a sintered iron core in the high-speed rotation of the machine tool is avoided. The secondary magnetic core 42 is fixed on the tool handle 6 through AB glue, and the primary magnetic core 52 is fixed through a fixing device externally connected to the outer edge of the spindle of the machine tool.
As shown in fig. 3, the secondary magnetic structure 4 is composed of five arc ferrite cores 42, a secondary coil 43 and an aluminum shell 41, the radian enclosed by each core 42 is 72 degrees, the bottom of each core 42 is provided with a four-degree allowance for the coil 43 to pass through, so that adjacent cores are not interfered, the bottom coil winds along the U-shaped bottom of the ferrite core and is connected with piezoelectric ceramics in the tool holder through an inner hole, the adjacent coils are connected in series, the secondary magnetic ring and the coil are protected by the aluminum shell, and the shell is fixed on the tool holder through adhesion.
The secondary core 42 and the primary core 52 are both made of a magnetic material with a relative permeability of more than 1500, preferably a PC40 ferrite core material with a relative permeability of 2000. Each of the secondary magnetic core 42 and the coil wound on the primary magnetic core 52 is wound by using an enameled wire with a diameter of 0.5mm, wherein 80 turns are wound on the primary magnetic core 52, and 80 turns are wound on each of the secondary magnetic cores 42 in the secondary magnetic rings.
The primary magnetic structure 5 is composed of an arc ferrite magnetic core 52, a primary coil 53 and an aluminum shell 51, the radian of the magnetic core is 72 degrees and is consistent with the radian enclosed by a single secondary magnetic core, an air gap is reserved between the secondary magnetic core 42 and the primary magnetic core 52 to ensure that the primary magnetic core and the secondary magnetic core do not interfere with each other when the spindle rotates, the top of the primary magnetic core 52 is wound with a coil along the circumferential direction, the aluminum shell is arranged outside the primary magnetic core 52 and the primary coil 53 for protection, and the shell is fixedly connected to the outer edge of the spindle of the machine tool.
The radian and the area of each secondary magnetic core 42 are consistent with those of the primary magnetic core 52, namely, the areas of the secondary magnetic ring and the primary magnetic core are always consistent. The radian of each secondary magnetic core 42 is equal to that of the primary magnetic core 52, and the radian is one fifth of an arc, and the equal relation is suitable for other angular relations of the secondary magnetic ring and the primary magnetic core, namely one third of an arc, one fourth of an arc, one sixth of an arc and the like.
During operation, a high-frequency ultrasonic signal of an ultrasonic power supply enters the primary coil 53 through a wire hole of the primary magnetic core protective shell 51, an alternating magnetic field is generated inside the primary magnetic core 52, induced electromotive force is generated in the secondary coil after the magnetic field passes through the distributed magnetic cores 42, and non-contact transmission of ultrasonic energy is completed, particularly, the relative areas of the primary magnetic core 52 and each distributed magnetic core 42 are kept consistent, and the total area of contact between the primary magnetic core 52 and each distributed magnetic core 42 is ensured to be equal in the process that the secondary magnetic ring 4 rotates along with the main shaft.
The secondary magnetic ring is divided into a plurality of magnetic core coils which are connected in series, the plurality of secondary magnetic cores form a distributed secondary magnetic ring, the distribution number of the distributed structures of the secondary magnetic ring depends on specific processing equipment, namely the radian corresponding to the largest primary magnetic core meeting the automatic tool changing requirement of the processing equipment is equal to the radian corresponding to a single distributed magnetic core coil in the secondary magnetic ring, and on the basis, one-third circular arc design, one-fourth circular arc design, one-sixth circular arc design and the like can be carried out, and the like.
According to the distributed rotary ultrasonic wireless energy transfer device, through the design of the distributed magnetic core structure, the non-contact transmission of electric energy is realized under the condition that the automatic tool changing requirement of a machining center is met, the rotating speed of a machine tool can be improved without limitation, meanwhile, the high-efficiency transmission of magnetic energy is realized through the distributed structural design, the problems that the coupling coefficient of a magnetic ring in a general rotary ultrasonic non-contact energy transfer device with an asymmetric structure is low and the heating phenomenon is obvious are solved, and the guarantee is provided for the long-time stable work of the machining center.
The present invention has been described in connection with the embodiments and the accompanying drawings, which are illustrative and not restrictive, and it is understood that variations and modifications thereof can be effected by those skilled in the art without departing from the spirit and scope of the invention.

Claims (5)

1. The utility model provides a rotatory ultrasonic machining device of wireless biography energy of distributing type which characterized in that: the ultrasonic grinding head comprises an ultrasonic grinding head (1), an amplitude transformer (3), a primary magnetic structure (5), a secondary magnetic structure (4) and a knife handle shell (6), wherein the middle part of the amplitude transformer (3) is hermetically connected to the opening end surface of the knife handle shell (6) through a flange connection structure, two ends of the amplitude transformer (3) positioned inside and outside the knife handle shell (6) are respectively used as the inner end and the outer end of the amplitude transformer (3), piezoelectric ceramics (8) are fixed on the amplitude transformer (3) between a flange and the inner end, and the outer end of the amplitude transformer (3) is coaxially and fixedly connected with the ultrasonic grinding head (1); the outer peripheral surface of the knife handle shell (6) is sequentially sleeved with a primary magnetic structure (5) and a secondary magnetic structure (4) along the axis direction, the primary magnetic structure (5) is fixed on the machine tool and does not move along with the knife handle shell (6), and the secondary magnetic structure (4) is fixed on the knife handle shell (6) and moves synchronously along with the knife handle shell (6);
the secondary magnetic structure (4) comprises a secondary magnetic ring protective shell (41), a secondary magnetic core (42) and a secondary coil (43), the inner circumferential surface of the secondary magnetic ring protective shell (41) is fixedly connected with the outer circumferential surface of the knife handle shell (6),
the secondary magnetic ring protection shell (41) is provided with an annular opening cavity along the circumferential direction, a plurality of identical secondary magnetic cores (42) are sequentially embedded in the annular opening cavity along the complete circumferential direction of the secondary magnetic ring protection shell (41), the plurality of secondary magnetic cores (42) are sequentially and tightly connected to form a complete secondary magnetic ring, each secondary magnetic core (42) is wound with a secondary coil (43), and all the secondary coils (43) are sequentially connected in series and then connected with the piezoelectric ceramics (8);
the primary magnetic structure (5) comprises a primary magnetic core protective shell (51), a primary magnetic core (52) and a primary coil (53), wherein the primary magnetic core protective shell (51) is provided with an arc-shaped opening cavity along the circumferential direction, the arc-shaped opening cavity is opposite to the opening surface of the annular opening cavity of the secondary magnetic ring protective shell (41), a single primary magnetic core (52) is fixedly embedded in the arc-shaped opening cavity, the structure of the primary magnetic core (52) is the same as that of a single secondary magnetic core (42), the primary coil (53) is wound on the primary magnetic core (52) in the same way as that of a secondary coil (43) is wound on the secondary magnetic core (42), the end surface of the primary magnetic core (52) facing the opening surface of the arc-shaped opening cavity is used as a primary magnetic ring surface, the end surface of the secondary magnetic ring facing the opening surface of the annular opening cavity is used as a secondary magnetic ring surface, and, the area of the positive phase in the secondary magnetic ring surface relative to the area of the primary magnetic ring surface is always kept the same at any time when the knife handle shell (6) drives the secondary magnetic ring to rotate;
the secondary coil (43) is wound on the secondary magnetic core (42) in a specific mode that: each secondary magnetic core (42) is provided with an arc-shaped groove which is through in the circumferential direction, and a secondary coil (43) is wound at the bottom of the groove of the secondary magnetic core (42) along the circumferential extension direction of the groove; the direction of the notches of the arc-shaped grooves is the same as the opening direction of an opening cavity of the secondary magnetic ring protective shell (41), every two adjacent arc-shaped grooves are communicated to form a complete annular groove, the annular end face of the secondary magnetic ring is divided into an inner annular ring and an outer annular ring which are concentric, the inner annular ring and the outer annular ring form a concentric double-annular surface, and the concentric double-annular surface is used as a secondary magnetic ring surface;
the shape of the end part magnetic core of each magnetic core coil is consistent with that of the magnetic core coil of the primary magnetic core, and the relative areas of the primary magnetic core and the secondary magnetic ring are guaranteed to be consistent at any time when the main shaft rotates.
2. The distributed wireless energy transmission rotary ultrasonic processing device according to claim 1, wherein: the part of the amplitude transformer (3) between the inner end and the flange is sequentially sleeved with the piezoelectric ceramics (8) and then sequentially sleeved with the aluminum pad (81) and the pressing cap (82), and the inner end of the amplitude transformer (3) is in threaded fastening connection with the central fixed rod (83), so that the piezoelectric ceramics (8) are compressed and fixed.
3. The distributed wireless energy transmission rotary ultrasonic processing device according to claim 1, wherein: the other end of the amplitude transformer (3) is coaxially and fixedly connected with the ultrasonic grinding head (1) through a nut spring clamping piece (2), the nut spring clamping piece (2) comprises a nut (21) and a clamping spring (22), the axial two ends of the clamping spring (22) respectively clamp the end part of the ultrasonic grinding head (1) and the end part of the amplitude transformer (3), and the amplitude transformer (3) and the ultrasonic grinding head (1) are clamped and fixed through the nut (21).
4. The distributed wireless energy transmission rotary ultrasonic processing device according to claim 1, wherein: the axial distance between the primary magnetic structure (5) and the secondary magnetic structure (4) is adjusted by fixing the primary magnetic structure (5) on the machine tool.
5. The distributed wireless energy transmission rotary ultrasonic processing device according to claim 1, wherein: the opening end face of the cutter handle shell (6) is circumferentially provided with a threaded hole (61) serving as a flange connecting hole, the middle of the amplitude transformer (3) is sleeved with a flange connecting structure, and the amplitude transformer (3) is fixedly connected to the cutter handle shell (6) through the flange connecting structure.
CN201910712109.0A 2019-08-02 2019-08-02 Distributed wireless energy transmission rotary ultrasonic machining device Active CN110561203B (en)

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Citations (8)

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