CN106925792B - Processing technology and processing device for tooth-shaped surface of inner hole of waveguide tube with large length-diameter ratio - Google Patents
Processing technology and processing device for tooth-shaped surface of inner hole of waveguide tube with large length-diameter ratio Download PDFInfo
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- CN106925792B CN106925792B CN201511025754.3A CN201511025754A CN106925792B CN 106925792 B CN106925792 B CN 106925792B CN 201511025754 A CN201511025754 A CN 201511025754A CN 106925792 B CN106925792 B CN 106925792B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B1/00—Methods for turning or working essentially requiring the use of turning-machines; Use of auxiliary equipment in connection with such methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/10—Cutting tools with special provision for cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
- B23B29/02—Boring bars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/12—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for securing to a spindle in general
Abstract
The invention belongs to the technical field of precision machining, and relates to a machining process and a machining device for machining the tooth-shaped surface of an inner hole of a corrugated waveguide pipe with a large length-diameter ratio, wherein the machining device comprises four parts, namely 1 standard horizontal type numerical control lathe, 2 automatic centering clamps, 1 double-support boring cutter rod and 1 set of ultrasonic vibration cutting device; the processing technology is divided into five steps; wherein the workpiece double support increases the rigidity of the workpiece; the rigidity of the cutter bar is increased by the double support of the cutter bar; the cutter is added with ultrasonic vibration, so that the cutting force is reduced, and the durability of the cutter is improved; the high-pressure cooling liquid directly acts on the tool nose, so that the cooling effect is improved, the cutting chips are broken and taken away, and the scratch of the cutting chips on the processed surface is reduced; by the processing system and the processing technology, the problem that the existing processing system cannot process the continuous sine wave tooth-shaped surface of the inner hole of the waveguide with the large length-diameter ratio is solved, the form and position error is less than 0.04mm, and the surface roughness is less than Rz 4.
Description
Technical Field
The invention belongs to the technical field of precision machining, and relates to a machining process and a machining device for machining a tooth-shaped surface of an inner hole of a corrugated waveguide pipe with a large length-diameter ratio.
Background
In nuclear fusion research, in order to heat plasma to the temperature required by fusion reaction, various heating means are generally required, and electron cyclotron resonance heating is an important heating means. The power of the electron cyclotron resonance heating single-set system is usually 500kW to 1MW, and high-power microwaves need to be transmitted through the transmission system and injected into the plasma. In order to stably transmit high-power long-pulse microwaves with low consumption and high efficiency, a corrugated straight waveguide is generally used as a main transmission component of an electron cyclotron resonance heating system. The required corrugated waveguide is a circular tubular component with an inner hole surface in a tooth-shaped structure, in order to ensure high purity of a transmitted microwave mode and effectively avoid point discharge, the inner hole surface of the waveguide tube is designed into a continuous sine wave structure, and the requirements on the size precision, the position and the surface roughness of the inner tooth are high. In addition, in order to improve the installation collimation of the transmission line, effectively reduce the larger microwave loss caused by the butt joint installation deviation of the waveguide tube and avoid the occurrence of the ignition phenomenon, the longer the corrugated waveguide tube is, the better the corrugated waveguide tube is required to be.
The waveguide tube is mostly made of high-quality aluminum alloy materials through stress-free heat treatment, the waveguide tube is generally processed by a common numerical control turning method, a process system of the waveguide tube comprises a numerical control lathe, a clamp and a cutter, and the common numerical control turning has the characteristics of easy quality control and high processing efficiency. However, when the boring cutter bar is used for processing the waveguide tube with a large length-diameter ratio, only a cantilever beam structure can be adopted, on one hand, due to the action of cutting force, the cutter bar is subjected to deflection and vibration, so that the tooth shape and the position are out of tolerance, and the surface roughness is increased; on the other hand, the machining force is larger, so that the deformation of a process system is also larger, and the comprehensive action of unstable system deformation and vibration further increases the surface roughness value and reduces the durability of the cutter. Therefore, the existing processing technology is difficult to meet the technical requirements of the tooth form precision, the uniformity and the smoothness of the inner wall of the corrugated waveguide tube with the length-diameter ratio of 1 meter required by a high-power electronic cyclotron system. The process system aims to solve the problems of poor rigidity, low cutter durability and large surface roughness value of the existing turning process system: by transforming a common numerical control machine tool and designing and manufacturing a special clamp and a special boring cutter bar, the processing requirement of a long workpiece with a large length-diameter ratio is met, and the rigidity of a process system is improved; by adopting the ultrasonic vibration cutting technology, the turning force is reduced, the durability of the cutter is improved, and the roughness value is reduced.
Disclosure of Invention
The invention aims to provide a processing technology and a processing device for processing a tooth-shaped surface of an inner hole of a waveguide tube with a large length-diameter ratio.
The technical scheme adopted by the invention is as follows:
a large length-diameter ratio waveguide pipe inner hole tooth-shaped surface machining device comprises: 1 horizontal numerically controlled lathe of standard, 2 automatic centering anchor clamps, 1 pair of boring cutter arbor and 1 set of ultrasonic vibration cutting device, the big length-diameter ratio waveguide pipe of required processing is used for transmitting MW magnitude long pulse millimeter wave, and the inner wall adopts sinusoidal ripple structure, and the value of ripple degree of depth is d 0.54mm 0.02, and the value of ripple cycle is P0.8 mm 0.02, and the waveguide inner wall is the curved surface of relative smoothness.
The improved standard horizontal numerically controlled machine tool consists of one standard numerically controlled horizontal lathe, one main shaft, one newly increased lathe bed and two new tool rests on the left and right ends of the lathe bed.
The machining device for the toothed surface of the inner hole of the waveguide tube with the large length-diameter ratio is characterized in that the diameter of a central hole of a main shaft can pass through a workpiece, two ends of the main shaft are provided with a spigot and a connecting screw hole for mounting a self-centering clamp, and the motion precision of the main shaft is 0.005 mm.
The automatic centering clamp consists of an elastic clamping sleeve, a compression nut and an automatic centering clamp body, and the compression nut is rotated to radially contract or expand the elastic clamping sleeve so as to compress or loosen a workpiece by an inner hole of the elastic clamping sleeve.
The concentricity of an inner hole of an elastic cutting sleeve and a spigot circle B of an automatic centering clamp is 0.005 mm, and the perpendicularity of the inner hole of the elastic cutting sleeve and an installation surface A is less than 0.01 mm.
A processing device for a tooth-shaped surface of an inner hole of a waveguide tube with a large length-diameter ratio is characterized in that a double-support boring cutter bar consists of an energy converter and an amplitude increasing rod of an ultrasonic vibration part, a double-support boring cutter bar body, a cutter pressing screw, a cutter and a cooling liquid pipe joint; the length of the double-support boring cutter bar body is more than twice of the length of a workpiece to be machined, a rectangular notch is formed in the middle of the double-support boring cutter bar body and used for installing a cutter, and the cutter is tightly pressed on the double-support boring cutter bar body through two cutter pressing screws; one end of the double-support boring cutter bar body is provided with an energy converter and an amplification rod, and a cooling liquid pipe joint at the other end is connected with a cooling system of the machine tool.
The ultrasonic vibration cutting device consists of an ultrasonic signal generator, a lead, a transducer of a double-support boring cutter rod and an amplitude-increasing rod.
A processing technology for a tooth-shaped surface of an inner hole of a waveguide pipe with a large length-diameter ratio comprises the following steps:
the first step is as follows: installing automatic centering fixtures, respectively arranging the two automatic centering fixtures on flange ports at two ends of a main shaft, aligning the two automatic centering fixtures within a range of 0.01 mm by using a dial indicator, and compressing a connecting screw;
the second step is that: installing a processing workpiece, enabling the processing workpiece to pass through the automatic centering fixture and the central hole of the main shaft, and respectively rotating a compression nut of the automatic centering fixture to compress the processing workpiece;
the third step: installing a double-support boring cutter bar, operating the new cutter bar to the outermost end of the modified standard machine tool, installing one end of the double-support boring cutter bar on the new cutter bar, operating the modified standard machine tool to enable the double-support boring cutter bar to penetrate through a central hole of a machined workpiece, and installing the other end of the double-support boring cutter bar on the new cutter bar at the other end; installing a cutter in a rectangular notch in the middle of a double-support boring cutter rod; connecting a cooling liquid pipe with a cooling liquid pipe joint;
the fourth step: setting and cutting a tool, starting the modified standard machine tool and an ultrasonic signal generator, moving the tool to one end of a workpiece to test and cut a spigot for a plurality of times after checking and confirming that a cooling system and a vibration system are normal, determining the original position of a tool nose after measurement, and starting the machine tool to process;
the fifth step: and (3) disassembling the machined workpiece, namely disassembling the cooling liquid pipe from the cooling liquid pipe connector after the modified standard machine tool finishes workpiece machining according to a program, then loosening one end of the double-support boring cutter bar and the corresponding new cutter frame, moving the new cutter frame 4 at the other end outwards to the outside of the double-support boring cutter bar completely moved out of the workpiece, and loosening a compression nut on the automatic centering fixture to take the workpiece out of the new cutter frame at the end.
The advantages of the invention are as follows:
1. the rigidity of the workpiece is increased by the double supporting of the workpiece;
2. the rigidity of the cutter bar is increased by the double support of the cutter bar;
3. the cutter is added with ultrasonic vibration, so that the cutting force is reduced, and the durability of the cutter is improved;
4. the high-pressure cooling liquid directly acts on the tool nose, so that the cooling effect is improved, the cutting chips are broken and taken away, and the scratch of the cutting chips on the processed surface is reduced.
The invention has the beneficial effects that: the problem that the existing process system cannot process a continuous sine wave tooth-shaped surface of the inner hole of the waveguide tube with a large length-diameter ratio is solved, the shape and position error is less than 0.04mm, and the surface roughness is less than Rz 4.
Drawings
FIG. 1 is a schematic view of a 1-meter corrugated waveguide structure to be processed according to the present invention;
FIG. 2 is a schematic view of the tooth profile of the corrugated waveguide of the present invention;
FIG. 3 is a schematic view of a machine tool modification of the present invention;
FIG. 4 is a schematic view of the self-centering fixture of the present invention;
FIG. 5 is a schematic view of the dual support boring bar of the present invention;
FIG. 6 is a schematic view of the surface A-A of the double support boring bar of the present invention;
in the figure, 1-standard numerical control sleeping car; 2-a main shaft; 3-newly adding a lathe bed; 4-new tool holder; 5-elastic card sleeve; 6-pressing the nut; 7-self-centering fixture body; 8-rectangular notches; 9-double-support boring cutter bar body; 10-tool hold-down screw, 11-tool; 12-coolant line connection; 13-an ultrasonic signal generator; 14-a wire; 15-a transducer; 16-an amplitude-increasing rod; 17-self-centering clamp; 18-double support boring bar; 19-ultrasonic vibration cutting device.
Detailed Description
The following describes in detail a machining process and a machining apparatus for a tooth-shaped surface of an inner hole of a waveguide tube having a length of 1 meter and a large length-diameter ratio according to the present invention with reference to the accompanying drawings and examples.
As shown in fig. 1, the 1-meter-long waveguide with a large length-diameter ratio, which is required to be processed by the present invention, is mainly used for transmitting MW-level long pulse millimeter waves, the inner wall adopts a sinusoidal ripple structure, the ripple depth d is 0.54mm ± 0.02, and the ripple period P is 0.8mm ± 0.02. The inner wall of the waveguide tube is a relatively smooth curved surface, so that point discharge in the high-power microwave transmission process can be effectively avoided, and high-power long-pulse millimeter waves can be efficiently transmitted.
As shown in fig. 2, 3, 4, 5 and 6, the machining device for machining the tooth-shaped surface of the inner hole of the waveguide with the length-diameter ratio of 1 meter comprises: 1 reconstructed standard horizontal numerically controlled lathe, 2 automatic centering clamps 17, 1 double-support boring cutter bar 18 and 1 set of ultrasonic vibration cutting device 19.
The improved standard horizontal numerical control machine tool comprises: as shown in the attached figure 2, the numerical control lathe consists of a standard numerical control sleeping car 1, a main shaft 2, a newly-added lathe bed 3 and new tool rests 4 at the left end and the right end respectively. The diameter of the central hole of the main shaft 2 can pass through a workpiece, the two ends of the main shaft are provided with a spigot and a connecting screw hole for installing an automatic centering clamp 17, and the movement precision of the main shaft 2 is 0.005 mm; the newly added lathe bed 3 comprises a guide rail, a large supporting plate, a small supporting plate, a tool rest, X and Y-direction lead screws and a servo motor; after the standard numerical control sleeping car 1 and the newly added lathe 3 are assembled, the new tool rest 4 can synchronously and respectively run with the tool rest of the original lathe through a numerical control system.
The self-centering jig 17: as shown in the attached drawing 3, the automatic centering fixture 17 is composed of an elastic cutting sleeve 5, a compression nut 6 and an automatic centering fixture body 7, the elastic cutting sleeve 5 can be radially contracted or expanded by rotating the compression nut 6, so that the inner hole of the elastic cutting sleeve 5 can be compressed or loosened on a workpiece, the error of the concentricity of a spigot circle B of the inner hole fixture of the elastic cutting sleeve 5 and the workpiece is 0.005 mm, and the perpendicularity of the inner hole fixture and the mounting surface A is less than 0.01 mm.
The double-support boring bar 18: as shown in figure 5, the ultrasonic boring bar consists of a transducer 15 and an amplitude rod 16 of an ultrasonic vibration part, a double-support boring bar body 9, a cutter pressing screw 10, a cutter 11 and a cooling liquid pipe joint 12. The double-support boring cutter bar body 9 is a tubular part with the length more than twice that of a machined workpiece, a rectangular notch 8 is formed in the middle for installing a cutter 11, and the cutter 11 is tightly pressed on the double-support boring cutter bar body 9 through two cutter pressing screws 10; one end of the double-support boring cutter bar body 9 is provided with an energy converter 15 and an amplitude rod 16, and ultrasonic mechanical vibration on the amplitude rod 16 acts on the cutter 11; a cooling liquid pipe joint 12 at the other end of the double-support boring cutter rod 9 is connected with a cooling system of the machine tool, and cooling liquid directly cools a cutter head and washes away chips through a center hole of the double-support boring cutter rod 9 and a gap between the upper end surface of the cutter 11 and the double-support boring cutter rod 9; two ends of the double-support boring cutter rod 9 are milled flat and are used for being connected with two new cutter holders 4.
The ultrasonic vibration cutting device 19: the ultrasonic vibration cutting device 19 is composed of an ultrasonic signal generator 13, a lead wire 14, a transducer 15 for double supporting a boring bar 18 and an amplifier bar 16. The ultrasonic signal generator 13 generates an ultrasonic electric signal and can adjust the intensity and frequency of the signal, the signal is transmitted to the transducer 15 through the lead 14, the transducer 15 converts the electric signal into mechanical vibration with the same frequency, and the amplitude is increased to the required amplitude through the amplitude increasing rod 16.
The processing procedures of the embodiment are as follows:
the first step is as follows: installing automatic centering clamps 17, respectively arranging the two automatic centering clamps 17 on flange ports at two ends of a main shaft 2 of a standard machine tool 1, aligning the two automatic centering clamps 17 within a range of 0.01 mm by using a dial indicator, and compressing a connecting screw;
the second step is that: installing a processing workpiece, enabling the processing workpiece to pass through the automatic centering fixture 17 and the central hole of the main shaft 2, and respectively rotating the compression nut 6 of the automatic centering fixture 17 to compress the processing workpiece;
the third step: installing a double-support boring cutter bar 18, operating the new cutter frame 4 to the outermost end of the standard machine tool 1, installing one end of the double-support boring cutter bar 18 on the new cutter frame 4, operating the standard machine tool 1 to enable the double-support boring cutter bar 18 to penetrate through a central hole of a machined workpiece, and installing the other end of the double-support boring cutter bar 18 on the new cutter frame 4 at the other end; installing a cutter 11 in the middle rectangular notch 8 of the double-support boring cutter rod 18; connecting the coolant line to a coolant line coupler 12;
the fourth step: setting and cutting tools, starting a standard machine tool 1 and an ultrasonic signal generator 13, after checking and confirming that a cooling system and a vibration system are normal, moving a tool 11 to one end of a workpiece to test and cut a spigot for a plurality of times, determining the original position of a tool nose after measurement, and starting machine tool machining;
the fifth step: and (3) disassembling the machined workpiece, namely after the standard machine tool 1 finishes machining the workpiece according to a program, firstly, detaching a cooling liquid pipe from a cooling liquid pipe joint 12, then loosening one end of the double-support boring cutter rod 18 from the corresponding new cutter holder 4, outwards moving the new cutter holder 4 at the other end to the outside of the double-support boring cutter rod 18 completely moved out of the workpiece, and loosening the compression nut 6 on the automatic centering clamp 17 to take the workpiece out of the new cutter holder 4 at the end.
Claims (4)
1. A processing device for a tooth-shaped surface of an inner hole of a waveguide pipe with a large length-diameter ratio comprises: 1 standard horizontal numerically controlled lathe of reforming transform, 2 self-centering anchor clamps (17), 1 two support boring cutter arbor (18) and 1 set of ultrasonic vibration cutting device (19), its characterized in that: the large length-diameter ratio waveguide tube to be processed is used for transmitting MW-magnitude long pulse millimeter waves, the inner wall of the waveguide tube is of a sine ripple structure, the ripple depth is d which is 0.54mm +/-0.02, the ripple period is P which is 0.8mm +/-0.02, and the inner wall of the waveguide tube is a relatively smooth curved surface;
the improved standard horizontal numerical control machine tool consists of a standard numerical control horizontal lathe (1), a main shaft (2), a newly-added lathe bed (3) and new tool rests (4) at the left end and the right end respectively;
the automatic centering clamp (17) consists of an elastic clamping sleeve (5), a compression nut (6) and an automatic centering clamp body (7), and the elastic clamping sleeve (5) can be radially contracted or expanded by rotating the compression nut (6), so that the inner hole of the elastic clamping sleeve (5) can compress or release a workpiece;
the double-support boring cutter bar (18) consists of an energy converter (15) and an amplification rod (16) of an ultrasonic vibration part, a double-support boring cutter bar body (9), a cutter pressing screw (10), a cutter (11) and a cooling liquid pipe joint (12); the length of the double-support boring cutter bar body (9) is more than twice of the length of a machined workpiece, a rectangular notch (8) is formed in the middle of the double-support boring cutter bar body and used for installing a cutter (11), and the cutter (11) is tightly pressed on the double-support boring cutter bar body (9) through two cutter pressing screws (10); one end of the double-support boring cutter bar body (9) is provided with an energy converter (15) and an amplification rod (16), and a cooling liquid pipe joint (12) at the other end is connected with a cooling system of the machine tool;
the ultrasonic vibration cutting device (19) consists of an ultrasonic signal generator (13), a lead (14), a transducer (15) of a double-support boring cutter rod (18) and an amplification rod (16).
2. The apparatus for machining a serrated surface of an inner hole of a waveguide tube with a large length-diameter ratio as claimed in claim 1, wherein: the diameter of the central hole of the main shaft (2) can pass through a workpiece, the two ends of the main shaft are provided with a spigot and a connecting screw hole for installing the automatic centering clamp (17), and the movement precision of the main shaft (2) is 0.005 mm.
3. The apparatus for machining a serrated surface of an inner hole of a waveguide tube with a large length-diameter ratio as claimed in claim 1, wherein: the concentricity of the inner hole of the elastic cutting sleeve (5) and the spigot circle B of the automatic centering fixture is 0.005 mm, and the verticality of the inner hole of the elastic cutting sleeve (5) and the mounting surface A is less than 0.01 mm.
4. A machining process for machining a tooth-shaped surface of an inner hole of a waveguide with a large length-diameter ratio by using the machining device as claimed in claim 1, which comprises the following steps:
the first step is as follows: installing automatic centering clamps (17), respectively arranging the two automatic centering clamps (17) on flange ports at two ends of the main shaft (2), using a dial indicator to find the position within a range of 0.01 mm, and compressing a connecting screw;
the second step is that: installing a processing workpiece, enabling the processing workpiece to pass through the automatic centering fixture (17) and the central hole of the main shaft (2), and respectively rotating a compression nut (6) of the automatic centering fixture (17) to compress the processing workpiece;
the third step: installing a double-support boring cutter bar (18), operating the new cutter frame (4) to the outermost end of the modified standard horizontal numerical control machine tool, installing one end of the double-support boring cutter bar (18) on the new cutter frame (4), operating the modified standard horizontal numerical control machine tool to enable the double-support boring cutter bar (18) to penetrate through a center hole of a machined workpiece, and installing the other end on the new cutter frame (4) at the other end; installing a cutter (11) in a rectangular notch (8) in the middle of a double-support boring cutter rod (18); connecting the coolant line to a coolant line adapter (12);
the fourth step: setting and cutting a tool, starting a modified standard horizontal numerical control machine tool and an ultrasonic signal generator (13), after checking and confirming that a cooling system and a vibration system are normal, moving the tool (11) to one end of a workpiece to perform trial cutting for a spigot time, determining the original position of a tool tip after measurement, and starting the machine tool for machining;
the fifth step: the method comprises the following steps of disassembling a machined workpiece, after the modified standard horizontal numerical control machine tool finishes workpiece machining according to a program, firstly disassembling a cooling liquid pipe from a cooling liquid pipe joint (12), then loosening one end of a double-support boring cutter bar (18) and a corresponding new cutter frame (4), then outwards moving the new cutter frame (4) at the other end to the outside of the double-support boring cutter bar (18) to completely move the workpiece out, and loosening a compression nut (6) on an automatic centering clamp (17) to take the workpiece out of the new cutter frame (4) at the end.
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| CN109967660A (en) * | 2017-12-27 | 2019-07-05 | 核工业西南物理研究院 | A kind of device of automatic cutting heating wire |
| CN108127129A (en) * | 2018-02-11 | 2018-06-08 | 扬州航瑞电子科技有限公司 | A kind of big L/D ratio feedforward waveguide pipe processing device and its method of work |
| CN111318725A (en) * | 2018-12-13 | 2020-06-23 | 镁亚精密股份有限公司 | Deep-hole ball thread hard turning method and lathe equipment applying same |
| CN113579316A (en) * | 2021-07-23 | 2021-11-02 | 江苏集萃精凯高端装备技术有限公司 | Ultrasonic auxiliary vibration processing method |
| CN114083361A (en) * | 2021-11-25 | 2022-02-25 | 航天科工哈尔滨风华有限公司 | Special concentric positioning device and method for grinding nonstandard ultra-long hard alloy cutter |
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| JP2009056569A (en) * | 2007-09-03 | 2009-03-19 | Citizen Machinery Co Ltd | Vibration cutting device |
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| JP2009056569A (en) * | 2007-09-03 | 2009-03-19 | Citizen Machinery Co Ltd | Vibration cutting device |
| CN101704219A (en) * | 2009-11-17 | 2010-05-12 | 赵显华 | Ultrasonic processing device |
| CN101982267A (en) * | 2010-10-09 | 2011-03-02 | 北京航空航天大学 | Guiding type auto-feed light and wear-resistant sliding pair ultrasonic vibration boring device |
| CN102717115A (en) * | 2012-06-14 | 2012-10-10 | 北京航空航天大学 | High-speed intermittent ultrasonic vibration cutting method for low-rigidity parts |
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