CN106825679B - A kind of ultrasonic vibration pneumatic drill based on rotating radio energy transmission - Google Patents
A kind of ultrasonic vibration pneumatic drill based on rotating radio energy transmission Download PDFInfo
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- CN106825679B CN106825679B CN201710109865.5A CN201710109865A CN106825679B CN 106825679 B CN106825679 B CN 106825679B CN 201710109865 A CN201710109865 A CN 201710109865A CN 106825679 B CN106825679 B CN 106825679B
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- amplitude transformer
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- power transmission
- wireless power
- ultrasonic vibration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
- B23B45/04—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor driven by fluid-pressure or pneumatic power
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Drilling And Boring (AREA)
Abstract
The invention discloses a kind of ultrasonic vibration pneumatic drills based on rotating radio energy transmission, are made of rotary wireless power transmission component, ultrasonic transduction component, amplitude transformer, collet component and connection component.Rotary wireless power transmission component is made of for realizing the two inter-agency electric energy transmission relatively rotated are done wireless power transmission primary and wireless power transmission secondary.Ultrasonic transduction component is used to ultrasonic electric signals being converted to supersonic frequency mechanical oscillation；Ultrasonic vibration amplitude transformer is used to small amplitude mechanical oscillation being enlarged into large amplitude mechanical oscillation, to reach the requirement of Ultrasonic Vibration Drilling processing.Collet component is used for clamping cutter；Connection component realizes power transmission and electric energy transmission for Ultrasonic Vibration Drilling component and pneumatic drill rear end to link together.By the way that ultrasonic vibration to be applied in traditional drilling process, is formed by the Compound Machining mode of ultrasonic vibration and traditional drilling campaign coupling, effectively improve processing quality, improve processing efficiency.
Description
Technical field
The present invention relates to Ultrasonic machining and pneumatics fields, specifically, being related to a kind of by ultrasonic vibration cutting and rotation
Rotatable wireless power transmission technology is conjointly employed in the novel hand-held drilling tool of common pneumatic drill.
Background technology
Pneumatic drill is a kind of hand held pneumatic tool, is mainly used for, to the drilling processing of metal component, being particularly suitable for thin-walled
The drilling of the light-alloys component such as shell and magnalium works, and is widely used in aerospace manufacture, automobile, shipbuilding, household electrical appliances system
It makes and maintenance industry, is a kind of indispensable common tool in aircraft manufacturing assembly.Pneumatic drill has rotating speed height, working environment
Adaptability is good, clean and safe, low cost, feature easy to maintain.But the stability of pneumatic drill is poor, noise is big, processing quality is low, no
Suitable for difficult-to-machine material, such as titanium alloy, carbon fibre reinforced composite and carbon fibre reinforced composite/alloy stack structure
The processing of equal components greatlys restrict application of the pneumatic drill in modern aircraft manufacture assembly.
Ultrasonic Vibration Drilling is to apply the ultrasonic vibration of high frequency a little to cutter or workpiece during the cutting process, i.e., with drilling
Based on, a kind of new combination technological method supplemented by ultrasonic vibration.Ultrasonic Vibration Drilling changes the continuous cutting of traditional drilling
Mechanism, can significantly reduce cutting force and cutting temperature, and enhancing chip breaking effect improves chip discharge, processing hardening reduced, to change
Kind machining condition, improves processing quality, material removing rate and cutter life etc..
In order to which Ultrasonic Vibration Drilling technology is applied to pneumatic drill, it is necessary to which the two inter-agency electric energy relatively rotated are done in solution
Transmission.Generally use conducting slip ring realizes the inter-agency electric energy transmission of two for doing and relatively rotating, but conducting slip ring is because using electricity
Contact slide electric energy transmission mode has the shortcomings that fever is serious, electric energy transmission is unstable, of high cost, flimsy.In order to avoid
It is insufficient, and Ultrasonic Vibration Drilling technology is applied to pneumatic drill, a kind of new ultrasonic vibration pneumatic drill is formed, using new rotary nothing
Line electric energy transmission technology significantly improves the processing performance of pneumatic drill.
Invention content
In order to avoid the shortcomings of the prior art, the present invention proposes a kind of ultrasound transmitted based on rotating radio energy
Vibrate pneumatic drill；By the way that ultrasonic vibration to be applied in traditional drilling process, formed by ultrasonic vibration and traditional drilling campaign coupling
Compound Machining mode.The Compound Machining mode can effectively improve processing quality, improve processing efficiency, reduce processing noise and
Improve operating personnel's operating condition.
The technical solution adopted by the present invention to solve the technical problems is:It is changed including rotary wireless power transmission component, ultrasound
Energy component, amplitude transformer, collet component, connection component, the rotary wireless power transmission component include wireless power transmission primary, nothing
Line transmission of electricity secondary, wireless power transmission primary and wireless power transmission secondary identical, the intermediate ring groove shape iron core for having axial hole for two structures,
Armature winding and secondary windings are installed respectively, for realizing two wireless power transmissions relatively rotated between component, nothing in annular groove
Line transmission of electricity is secondary to be mounted in amplitude transformer and is interference fitted with amplitude transformer, and is changed with conducting wire and ultrasound by the aperture in amplitude transformer
Can component connection, wireless power transmission primary be fastened on surely by clamp screw on procapsid and with amplitude transformer clearance fit, wireless power transmission
Primary is connect by the aperture conducting wire on pneumatic drill procapsid, back casing with supersonic generator；
The ultrasonic transduction component includes pre-tightening pressing plate, two piezoelectric ceramic pieces, two thick electrodes, insulation sleeves, is pressed in advance
Plate is mounted in amplitude transformer, and two piezoelectric ceramic pieces and two thick electrodes are spaced from each other to be sleeved on to be located on insulation sleeve and pre-tighten pressing plate
Side, insulation sleeve is sleeved in amplitude transformer and rotated with amplitude transformer, and piezoelectric ceramic piece is cirque structure, and thick electrode is
Intermediate round-meshed copper sheet has two symmetrical rectangular cams to be used for welding lead on outer diameter；
The amplitude transformer is the Step Shaft for having axial hole, and amplitude transformer right end is that screw hole is threadedly coupled with connecting shaft, amplitude transformer
Left end has one section of external screw thread and cone-shaped inner hole, and cone-shaped inner hole and external screw thread are for installing collet and chuck nut, amplitude transformer
Ultrasonic transduction component is assembled together by preload pressing plate and constitutes ultrasonic transducer, amplitude transformer is for amplifying shaking for ultrasonic vibration
Width；
The collet component includes collet, chuck nut, and collet is located in the taper of amplitude transformer front end
Kong Zhong, and be threadedly coupled with amplitude transformer, collet is used for clamping cutter, and chuck nut is used to fasten on cutter and collet
In luffing boom end and screw；
The connection component includes procapsid, connecting shaft, bearing, ball bearing, gasket, end cap, and procapsid is cylindrical shape
Structure, procapsid one end have external screw thread to be threadedly coupled with end housing after pneumatic drill, and the procapsid other end is connect with end cap, in end cap
Install gasket between side and ball bearing additional, ball bearing is located at wireless power transmission primary side, and bearing, which is located at, pre-tightens pressing plate side, even
Spindle one end is threadedly coupled with amplitude transformer, and the connecting shaft other end is connect with pneumatic drill rear end power assembly, and passes through conducting wire and ultrasound
Wave producer connects, and forms ultrasonic vibration pneumatic drill.
The connecting shaft is co-axially mounted with amplitude transformer, collet.
Advantageous effect
A kind of ultrasonic vibration pneumatic drill based on rotating radio energy transmission proposed by the present invention, by applying ultrasonic vibration
It is added in traditional drilling process, is formed by the Compound Machining mode of ultrasonic vibration and traditional drilling campaign coupling.The Compound Machining
Mode can effectively improve processing quality, improve processing efficiency, reduces processing noise and improve operator and justify operating condition.
The present invention is based on the ultrasonic vibration pneumatic drills of rotating radio energy transmission, are by ultrasonic vibration cutting and rotary nothing
Line electric energy transmission technology is applied to the novel hand-held drilling tool of common pneumatic drill, based on common pneumatic drill, with ultrasonic vibration drill
Turning device replaces the chuck of common pneumatic drill, and supersonic generator is for generating ultrasonic electric signals, driving Ultrasonic Vibration Drilling dress
Work is set, ultrasonic electric signals is made to be converted to supersonic frequency mechanical oscillation；Realize the Ultrasonic Vibration Drilling of pneumatic drill.
Ultrasonic Vibration Drilling is the combination process based on drilling, supplemented by ultrasonic vibration, changes the continuous of traditional drilling
Cutting scheme.Its performance advantage is compared with prior art:In process, cutting force and cutting temperature are significantly reduced；
Enhance chip breaking effect, improve chip discharge, processing hardening is reduced, so as to improve machining condition；Processing quality is improved, is improved particularly
Bore size precision and the accuracy of form and position reduce hole wall surface roughness, reduce or eliminate outlet burr；Mitigate tool wear, prolongs
Long cutter life；Improve material removing rate；Suitable for titanium alloy, aluminium alloy, nickel chromium high-temperature alloy, carbon fibre reinforced composite
The machining of equal difficult-to-machine materials.Drilling processing noise is greatly lowered, improves operating personnel's operating environment, drill thrust reduces
Keep hand-held pneumatic drill drilling more comfortable；Product cost is low, and service life is long.
Description of the drawings
Below in conjunction with the accompanying drawings with embodiment to a kind of ultrasonic vibration gas based on rotating radio energy transmission of the invention
Brill is described in further detail.
Fig. 1 is that the present invention is based on the ultrasonic vibration pneumatic drill schematic diagrames that rotating radio energy is transmitted.
Fig. 2 a are the drill unit schematic diagram of ultrasonic vibration pneumatic drill of the present invention.
Fig. 2 b are the drill unit assembling schematic diagram of ultrasonic vibration pneumatic drill of the present invention.
Fig. 3 a, Fig. 3 b are the rotary wireless power transmission component diagram of ultrasonic vibration pneumatic drill of the present invention.
Fig. 4 a, Fig. 4 b, Fig. 4 c, the amplitude transformer schematic diagram that Fig. 4 d is ultrasonic vibration pneumatic drill of the present invention.
Fig. 5 a, Fig. 5 b, Fig. 5 c, the procapsid schematic diagram that Fig. 5 d is ultrasonic vibration pneumatic drill.
Fig. 6 a, Fig. 6 b are the drill unit connecting shaft schematic diagram of ultrasonic vibration pneumatic drill.
Fig. 7 is the thick electrode schematic diagram of ultrasonic vibration pneumatic drill.
In figure:
1. 2. procapsid of connecting shaft, 3. bearing 4. pre-tightens 5. piezoelectric ceramic piece of pressing plate, 6. thick electrode, 7. wireless power transmission
12. collet of secondary primary 9. ball bearing, 10. end cap, 11. chuck nut of 8. wireless power transmissions, 13. cutter 14. becomes
15. gasket of width bar, 16. holding screw, 17. insulation sleeve
Specific implementation mode
The present embodiment is a kind of ultrasonic vibration pneumatic drill transmitted based on rotating radio energy.
Referring to the ultrasonic vibration pneumatic drill that Fig. 1~Fig. 7, the present embodiment are transmitted based on rotating radio energy, by rotary nothing
Line transmission of electricity component, ultrasonic transduction component, amplitude transformer, collet component and connection component composition.Rotary wireless power transmission component
For realizing wireless power transmission；Ultrasonic transduction component is used to ultrasonic electric signals being converted to supersonic frequency mechanical oscillation；Luffing
Bar is used to small amplitude mechanical oscillation being enlarged into large amplitude mechanical oscillation, to reach the requirement of Ultrasonic Vibration Drilling processing；Spring
Chuck component is used for clamping cutter；Connection component with pneumatic drill rear end for linking together.
In the present embodiment, rotary wireless power transmission component is made of wireless power transmission primary 8 and wireless power transmission secondary 7.Wirelessly
Transmission of electricity primary 8 and wireless power transmission secondary 7 are ring groove shape structure, and end face has conducting wire to introduce or draw.According to electromagnetic induction principle, nothing
Line transmission of electricity primary 8 and wireless power transmission secondary 7 are the identical ring groove shape iron core with axial hole of two shapes, size, two annular grooves
Shape iron core can relatively rotate, and install armature winding and secondary windings in annular groove respectively.In the ultrasonic vibration pneumatic drill course of work, nothing
Line transmission of electricity primary 8 does not rotate, and wireless power transmission secondary 7 is rotated together with amplitude transformer 14, for realizing that two relatively rotate between components
Wireless power transmission.Therefore, wireless power transmission secondary 7 is mounted on by interference fit in amplitude transformer 14, and passes through amplitude transformer
Aperture conducting wire on 14 is connect with ultrasonic transduction component, so that it is rotated with amplitude transformer 14 and ultrasonic transduction component, simultaneously
Electric energy is transmitted to ultrasonic transduction component.Wireless power transmission primary 8 is fastened on by holding screw 16 on procapsid 2, with amplitude transformer 14
Between be clearance fit, i.e., not with amplitude transformer 14 rotate.Wireless power transmission primary 8 passes through the aperture on pneumatic drill procapsid, back casing
It is connect with supersonic generator with conducting wire.
Ultrasonic transduction component includes pre-tightening pressing plate 4, two piezoelectric ceramic piece 5, two thick electrode 6, insulation sleeve 17, is pressed in advance
Plate 4 is the loop configuration for being threaded through-hole, for each part of ultrasonic transduction component to be fixed together；Two piezoelectricity potteries
Tile 5 is the loop configuration with circular through hole；Two thick electrodes 6 are intermediate round-meshed copper sheet, have on outer diameter two it is symmetrical
Rectangular cam, be used for welding lead.Insulation sleeve 17 is thin-wall tubular structure, is sleeved in amplitude transformer 14 for insulating.Two
Piezoelectric ceramic piece 5 and two thick electrodes are spaced from each other and are sleeved on insulation sleeve 17.When installation, insulation sleeve 17 is sleeved on change first
On width bar 14, and it is sequentially loaded into thick electrode 6, piezoelectric ceramic piece 5, thick electrode 6, piezoelectric ceramic piece 5, then by pre-tightening pressing plate 4
Each part is tightened together with amplitude transformer 14, it is made to be rotated with amplitude transformer 14.
Amplitude transformer 14 constitutes ultrasonic transducer with ultrasonic transduction component；The effect of amplitude transformer 14 is amplification ultrasonic transducer
Amplitude improves vibration velocity than the load matched between, cumulative and adjustment energy converter and cutter, to meet wanting for ultrasonic vibrating machining
It asks.Amplitude transformer 14 is the step slender cylinder structure for having axial hole, the amplitude for amplifying ultrasonic vibration.Amplitude transformer 14 is right
End is that screw hole is threadedly coupled with connecting shaft 1, and is driven and rotated by connecting shaft 1.One section of 14 left end of amplitude transformer has external screw thread and taper
Endoporus, cone-shaped inner hole and external screw thread are for installing collet 12 and chuck nut 11.Amplitude transformer 14 will be surpassed by pre-tightening pressing plate 4
Sound transduction assembly, which is assembled together, constitutes ultrasonic transducer.When ultrasonic vibration pneumatic drill works, amplitude transformer not only drives cutter 13
Rotation, and play amplification cutter top mechanical activation amplitude.
The threaded connection of collet component and amplitude transformer left end is used for clamping cutter.Collet component includes spring
Collet 12, chuck nut 11.Collet is chosen according to processing aperture；Chuck nut is chosen according to design requirement.When installation, first
Collet 12 is packed into chuck nut 11, then the two is integrally screwed in 14 left end of amplitude transformer, being put into after cutter 13 again will folder
Head nut 11 screws, and collet is mounted in ultrasonic amplitude of fluctuation device front end bellmouth, for installing cutter；Chuck nut is used for
Cutter and collet are anchored on ultrasonic amplitude transformer left end.
Connection component is made of procapsid 2, connecting shaft 1, bearing 3 and wire guide, conducting wire.Procapsid 2 be it is columnar structured,
Right end is equipped with external screw thread for being threadedly coupled with end housing after pneumatic drill.1 one end of connecting shaft is connect with pneumatic drill rear end power assembly, even
The spindle other end is threadedly coupled with amplitude transformer 14, to drive amplitude transformer 14 to rotate.Wire guide and conducting wire are used for ultrasonic vibration
Drilling component is connect with supersonic generator.Ultrasonic Vibration Drilling component is connect by connection component with pneumatic drill rear end, realizes power
Transmission and electric energy transmission, to constitute ultrasonic vibration pneumatic drill.
The circuit of the present embodiment ultrasonic vibration pneumatic drill connects:
By conducting wire by 220V, 50Hz power input supersonic generator, low frequency electrical signal turns by supersonic generator
Ultrasonic electric signals are turned to, ultrasonic electric signals are sent to wireless power transmission primary by conducting wire, then, by electromagnetic induction side
Electric energy is transmitted to wireless power transmission secondary by formula, then by guide hole by the extraction wire of wireless power transmission secondary and ultrasonic transducer
Two rectangular cams of thick electrode weld together, and ultrasonic electric signals are transmitted to ultrasonic transducer.
The effect of supersonic generator is the supersonic frequency ac signal that alternating current is converted into matching with ultrasonic transducer,
Drive ultrasonic transducer work.The selection of supersonic generator then according to rapidoprint and processing request select its working frequency and
Output power considers the characteristic and processing quality factors of rapidoprint, selects most suitably used supersonic generator.
And be connected to by conducting wire in the wireless power transmission primary of rotary wireless power transmission component, provide supersonic frequency to ultrasonic transducer
Electric signal.The input of supersonic generator uses 220V, 50Hz power supply.
After Ultrasonic Vibration Drilling component integrally assembles, pneumatic drill rear end is connected to by procapsid screw thread and connecting shaft,
Then the rubber protecting jacket of pneumatic drill is put on, the ultrasonic vibration pneumatic drill completely based on rotating radio energy transmission is constituted.
Claims (2)
1. a kind of ultrasonic vibration pneumatic drill based on rotating radio energy transmission, it is characterised in that:Including rotary wireless power transmission
Component, ultrasonic transduction component, amplitude transformer, collet component, connection component, the rotary wireless power transmission component include wireless
Transmission of electricity is primary, wireless power transmission is secondary, and wireless power transmission primary and wireless power transmission secondary are identical, intermediate for two structures axial hole
Ring groove shape iron core installs armature winding and secondary windings in annular groove respectively, for realize two relatively rotate it is wireless between components
Electric energy transmits, and wireless power transmission secondary is mounted in amplitude transformer and is interference fitted with amplitude transformer, and is used by the aperture in amplitude transformer
Conducting wire is connect with ultrasonic transduction component, and wireless power transmission primary is fastened on procapsid by clamp screw and is matched with amplitude transformer gap surely
It closes, wireless power transmission primary is connect by the aperture conducting wire on pneumatic drill procapsid, back casing with supersonic generator；
The ultrasonic transduction component includes pre-tightening pressing plate, two piezoelectric ceramic pieces, two thick electrodes, insulation sleeves, pre-tightens pressing plate peace
In amplitude transformer, two piezoelectric ceramic pieces and two thick electrodes are spaced from each other the side for being sleeved on and being located on insulation sleeve and pre-tightening pressing plate
Face, insulation sleeve are sleeved in amplitude transformer and are rotated with amplitude transformer, and piezoelectric ceramic piece is cirque structure, and thick electrode is centre
Round-meshed copper sheet has on outer diameter two symmetrical rectangular cams for welding lead；
The amplitude transformer is the Step Shaft for having axial hole, and amplitude transformer right end is that screw hole is threadedly coupled with connecting shaft, amplitude transformer left end
There are one section of external screw thread and cone-shaped inner hole, for installing collet and chuck nut, amplitude transformer passes through for cone-shaped inner hole and external screw thread
Ultrasonic transduction component is assembled together by preload pressing plate constitutes ultrasonic transducer, and amplitude transformer is used to amplify the amplitude of ultrasonic vibration；
The collet component includes collet, chuck nut, and collet is located in the cone-shaped inner hole of amplitude transformer front end,
And be threadedly coupled with amplitude transformer, collet is used for clamping cutter, and chuck nut is used to cutter and collet being fastened on change
Width boom end simultaneously screws；
The connection component includes procapsid, connecting shaft, bearing, ball bearing, gasket, end cap, procapsid be it is columnar structured,
Procapsid one end has external screw thread to be threadedly coupled with end housing after pneumatic drill, and the procapsid other end is connect with end cap, on the inside of end cap with
Install gasket between ball bearing additional, ball bearing is located at wireless power transmission primary side, and bearing, which is located at, pre-tightens pressing plate side, connecting shaft
One end is threadedly coupled with amplitude transformer, and the connecting shaft other end is connect with pneumatic drill rear end power assembly, and is sent out by conducting wire and ultrasonic wave
Raw device connection, forms ultrasonic vibration pneumatic drill.
2. the ultrasonic vibration pneumatic drill according to claim 1 based on rotating radio energy transmission, it is characterised in that:It is described
Connecting shaft is co-axially mounted with amplitude transformer, collet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710109865.5A CN106825679B (en) | 2017-02-28 | 2017-02-28 | A kind of ultrasonic vibration pneumatic drill based on rotating radio energy transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710109865.5A CN106825679B (en) | 2017-02-28 | 2017-02-28 | A kind of ultrasonic vibration pneumatic drill based on rotating radio energy transmission |
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| Publication Number | Publication Date |
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| CN106825679A CN106825679A (en) | 2017-06-13 |
| CN106825679B true CN106825679B (en) | 2018-08-21 |
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| CN201710109865.5A Expired - Fee Related CN106825679B (en) | 2017-02-28 | 2017-02-28 | A kind of ultrasonic vibration pneumatic drill based on rotating radio energy transmission |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104514A (en) * | 2017-06-30 | 2017-08-29 | 河南理工大学 | Suitable for the circulating type radio energy transmission system of Ultrasonic machining center automatic tool changer |
| CN108161076A (en) * | 2018-02-07 | 2018-06-15 | 陕西超克能机电科技发展有限公司 | Portable ultraphonic bores |
| CN108097995A (en) * | 2018-02-07 | 2018-06-01 | 陕西超克能机电科技发展有限公司 | A kind of ultrasonic hand-held bores |
| CN109261474B (en) * | 2018-08-16 | 2020-04-24 | 中南大学 | System and method for machining cylindrical gear through ultrasonic vibration assisted gear shaping |
| CN109176913A (en) * | 2018-11-01 | 2019-01-11 | 王玉鹏 | A kind of mute brill of ultrasonic wave |
| CN109261478B (en) * | 2018-11-09 | 2023-12-29 | 河南理工大学 | Ultrasonic drilling, grinding and milling method and system with vibration reduction and sealing functions |
| CN110496996B (en) * | 2019-09-02 | 2021-05-18 | 南昌航空大学 | Ultrasonic auxiliary drilling device applied to handheld pneumatic gun type drill |
| CN111297442A (en) * | 2020-04-02 | 2020-06-19 | 珠海市司迈科技有限公司 | Operation execution instrument |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4444853B4 (en) * | 1994-12-16 | 2006-09-28 | Hilti Ag | Hand tool for material-removing machining with an electro-acoustic transducer for the generation of ultrasonic vibrations |
| JPH09174462A (en) * | 1995-12-25 | 1997-07-08 | Asmo Co Ltd | Rotary tool |
| CN101179233A (en) * | 2007-11-07 | 2008-05-14 | 南京航空航天大学 | Swing type ultrasonic vibration drill |
| CN102151867B (en) * | 2011-03-14 | 2013-05-29 | 天津大学 | Rotary ultrasonic head based on machine tool attachment |
| CN103406567A (en) * | 2013-07-18 | 2013-11-27 | 西北工业大学 | High-speed ultrasonic vibration assistant air drill |
| CN103406568B (en) * | 2013-07-18 | 2015-10-21 | 西北工业大学 | A kind of based on ultrasonic vibration Auxiliary pneumatic drill |
| CN104400063B (en) * | 2014-11-12 | 2017-05-17 | 大连理工大学 | Handheld type ultrasonic electric drill |
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2017
- 2017-02-28 CN CN201710109865.5A patent/CN106825679B/en not_active Expired - Fee Related
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Granted publication date: 20180821 |