CN102922014B - Ultrasonic torsional vibration side milling method in combination with stretching clamping - Google Patents
Ultrasonic torsional vibration side milling method in combination with stretching clamping Download PDFInfo
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- CN102922014B CN102922014B CN201210414295.8A CN201210414295A CN102922014B CN 102922014 B CN102922014 B CN 102922014B CN 201210414295 A CN201210414295 A CN 201210414295A CN 102922014 B CN102922014 B CN 102922014B
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Abstract
The invention discloses an ultrasonic torsional vibration side milling method in combination with stretching clamping. The ultrasonic torsional vibration side milling method specifically comprises the following operation steps of: 1, selecting a milling tool according to the property of a work material and an accuracy requirement; 2, calculating corresponding prestress aiming at the work workpiece material, mounting a workpiece on a clamp with adjustable stretching force to guarantee that the prestress direction is parallel to the workpiece feeding direction and then adjusting the prestress of a surface to be machined of the workpiece to a calculated value; 3, starting a machine tool and an ultrasonic generator, keeping torsional vibration frequency at 20 kHz and amplitude of a cutter at 10 microns, and adjusting the using amount of milling according to the required technological parameter; 4, feeding the workpiece along with a working table, performing ultrasonic torsional vibration while rotating the milling cutter until the material to be removed is machined; 5, retracting the cutter, closing the ultrasonic generator and the machine tool, cooling and then unloading the workpiece; and 6, if continuously machining the workpiece, repeating the steps 1 to 5. According to the ultrasonic torsional vibration side milling method in combination with stretching clamping, the residual stress of a machining surface can be improved so as to further improve the fatigue strength of the workpiece, the cutting force and the cutting temperature can also be obviously reduced, the life of the cutter is prolonged, and the like.
Description
Technical field: the present invention relates to a kind of cutting process, especially a kind of ultrasonic torsional side milling method in conjunction with stretched fixation, belongs to Machining Technology field.
Background technology: along with the development of Aero-Space, national defense industry, modern medicine and biotechnology, increasing high performance material is used, but these materials are often difficult-to-machine material, therefore Conventional machining methods has been difficult to meet processing request needs to seek new processing method.In order to the processing request catering to raising occurs the methods such as UVC, ultrasonic torsional milling refers to workpiece course feed and milling cutter has the twisting vibration of high frequency while normally rotating.Though this processing method obviously can reduce cutting force and cutting temperature also can improve surface quality prolongation cutter life, the improvement dynamics of bearing workpiece the method for high load capacity pulsating stress for those is nowhere near.Milling in simple stretched fixation situation refers to and applies a suitable stress to workpiece in advance and keep this prestressing force until machine in process always.Though this processing method can improve the residual stress of machined surface, but the problems such as cutting force is large, cutting temperature is high, machining accuracy is low, flow harden is serious can not be overcome.Therefore, a kind of efficient, high-quality, low cost method for milling also be there is no for the wall plate type part as difficult-to-machine materials such as titanium alloys.
Summary of the invention: for above-mentioned the deficiencies in the prior art, the one that the invention provides a kind of wall plate type part for difficult-to-machine material is efficient, high-quality, low cost method for milling.
For achieving the above object, the technical solution used in the present invention is: a kind of ultrasonic torsional side milling method in conjunction with stretched fixation, and concrete operation step is as follows:
One, milling cutter is selected according to rapidoprint attribute and required precision.
Two, corresponding prestressing force (being generally 20% ~ 50% of material yield stress) is calculated for processing work material, trade union college on the fixture of adjustable tensile force, ensure that prestress square is to parallel with workpiece direction of feed, then regulate the prestressing force of workpiece work surface to calculated value.
Three, start lathe and supersonic generator, make torsion frequency be not less than 20kHz, cutter amplitude 10 microns, according to required technological parameter, regulate milling usage.
Four, workpiece is with table feed, and milling cutter carries out ultrasonic torsional, until process the material that need remove while rotating.
Five, withdrawing, cuts out supersonic generator and lathe, cools then discharging workpieces.
If six continue processing work, repeat one ~ five step.
Ultrasonic torsional side milling method under stretched fixation prerequisite of the present invention can be improved the residual stress of machined surface and then improve the fatigue strength of workpiece, obviously can also reduce cutting force, cutting temperature, prolongation cutter life etc., the method can the processing of efficient, high-quality, low cost as the wall plate type part of the difficult-to-machine materials such as titanium alloy.The present invention is not merely the superposition of milling and ultrasonic torsional method for milling in stretched fixation situation, requires here to be necessary for side milling, because the ultrasonic vibration direction of contact portion during side milling, workpiece direction of feed, pre-tensile stress direction are substantially parallel.The method is used well the advantage of these two kinds of milling modes to be melted mutually meeting under application conditions.
Accompanying drawing illustrates:
Fig. 1 is fundamental diagram of the present invention.
Fig. 2 is workpiece and cutter top view.
In figure: 1-workpiece, 2-helical end mills, 3-provides the fixture of stretched fixation, 4-workbench, 5-ultrasonic torsional handle of a knife, 6-CNC milling machine main shaft, 7-supersonic generator
Detailed description of the invention:
As depicted in figs. 1 and 2, device required for the present invention is by workpiece 1, helical end mills 2, CNC milling machine, supersonic generator 7 with ultrasonic torsional handle of a knife 5 and the fixture 3 of stretched fixation can be provided to form.In figure, 6 is CNC milling machine main shaft, A be workpiece lasting prestress square to, B is the direction of feed of workpiece, and C is milling cutter direction of rotation, and D is the ultrasonic torsional direction of milling cutter.The selection of milling cutter is selected according to different rapidoprints, such as machining titanium alloy, optional YG8; Unimach, optional YT15; Superhard material must be CBN or diamond tool.Helical end mills 2 is fixed on ultrasonic torsional handle of a knife 5 and on CNC milling machine main shaft 6, supersonic generator 7 is connected with ultrasonic torsional handle of a knife 5.
Use the method machining titanium alloy TC4 step as follows: 1. to select YG8 helical end mills according to processing request.2. for processing work 1, for TC4 calculates, corresponding prestressing force 246Mpa(is generally 20% ~ 50% of material yield stress, yield stress 820Mpa at this TC4), workpiece 1 is installed on the fixture 3 of adjustable tensile force, makes prestress square to then the regulate prestressing force of workpiece work surface parallel with workpiece direction of feed to 260Mpa.3. start lathe and supersonic generator 7, regulate milling usage and ultrasonic torsional parameter (cutting speed 40m/min, axial cutting-in 3mm, the wide 0.3mm of radial cut, feed engagement 0.05mm, ultrasonic torsional frequency 20kHz, amplitude 0.01mm) according to technological requirement.4. workpiece 1 is with workbench 4 feeding, and helical end mills 2 rotates while ultrasonic torsional, until complete the material that need remove.5. withdrawing, cuts out supersonic generator 7 and lathe, cools then discharging workpieces 1.If 6. continue processing work, repeat 1. ~ 5. walk.
Claims (2)
1., in conjunction with a ultrasonic torsional side milling method for stretched fixation, it is characterized in that, concrete operation step is as follows:
(1) milling cutter is selected according to rapidoprint attribute and required precision;
(2) calculate corresponding prestressing force for processing work material, trade union college on the fixture of adjustable tensile force, ensure that prestress square is to parallel with workpiece direction of feed, then regulate the prestressing force of workpiece work surface to calculated value;
(3) start lathe and supersonic generator, make torsion frequency be 20kHz, cutter amplitude 10 microns, according to required technological parameter, regulate milling usage;
(4) workpiece is with table feed, and milling cutter carries out ultrasonic torsional, until process the material that need remove while rotating;
(5) withdrawing, cuts out supersonic generator and lathe, cools then discharging workpieces;
(6) if continue processing work, step (1) ~ (5) are repeated.
2. a kind of ultrasonic torsional side milling method in conjunction with stretched fixation as claimed in claim 1, is characterized in that: the prestressing force described in step (2) is 20% ~ 50% of material yield stress.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210414295.8A CN102922014B (en) | 2012-10-25 | 2012-10-25 | Ultrasonic torsional vibration side milling method in combination with stretching clamping |
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| CN201210414295.8A CN102922014B (en) | 2012-10-25 | 2012-10-25 | Ultrasonic torsional vibration side milling method in combination with stretching clamping |
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| CN102922014A CN102922014A (en) | 2013-02-13 |
| CN102922014B true CN102922014B (en) | 2015-07-01 |
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| CN103737082A (en) * | 2013-12-20 | 2014-04-23 | 柳州正菱集团有限公司 | Technique for roughly milling two cylindrical end surfaces for automobile load rear plate spring hanging ring |
| CN103659211B (en) * | 2013-12-20 | 2016-04-06 | 上海现代先进超精密制造中心有限公司 | A kind of method of processing silicon carbide blade |
| CN104646739A (en) * | 2015-03-05 | 2015-05-27 | 中南大学 | Aluminum alloy side milling process under assistance of ultrasonic longitudinal vibration |
| CN107775064B (en) * | 2017-09-28 | 2019-02-26 | 南昌大学 | A kind of lateral method for milling of single-blade based on torsional ultrasonic |
| CN111618665B (en) * | 2020-05-19 | 2022-03-29 | 南方科技大学 | High-efficiency low-damage processing method and processing device |
| CN111736529B (en) * | 2020-06-11 | 2022-03-18 | 南京理工大学 | Method for improving cutting angle of carbon fiber reinforced composite material fiber based on ultrasonic milling |
| CN112620744B (en) * | 2020-12-10 | 2023-03-14 | 西北工业大学 | Ultrasonic vibration assisted milling method for TiB2/7050Al composite material difficult to machine |
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| JPH0671718B2 (en) * | 1985-10-22 | 1994-09-14 | 旭化成工業株式会社 | Method of cutting semi-plastic material |
| JP2011148016A (en) * | 2010-01-19 | 2011-08-04 | Kobe Steel Ltd | Method for efficiently cutting titanium and titanium alloy |
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| CN101837553A (en) * | 2010-05-07 | 2010-09-22 | 沈阳航空航天大学 | Numerical control processing method of pulsed force function |
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