CN210306119U

CN210306119U - Ultrasonic-assisted linear cutting microtexture forming device based on elliptical vibration

Info

Publication number: CN210306119U
Application number: CN201921237511.XU
Authority: CN
Inventors: 夏子文; 高国富; 袁照杰
Original assignee: Henan University of Technology
Current assignee: Henan University of Technology
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2020-04-14
Anticipated expiration: 2029-08-02

Abstract

The utility model discloses a little texture forming device of supersound auxiliary line cutting based on elliptical vibration, including quadrature ultrasonic vibration system, the fixed storehouse of ultrasonic vibrator, workstation leveling structure and seal structure. The included angle of the axes of the two ultrasonic vibrators is 90 degrees, the ultrasonic vibrators are connected with the workbench through threads and are fixed in the ultrasonic vibrator fixing bin through a flange plate, a lead welded on the vibrator transducer is connected with an external two-dimensional ultrasonic power supply through a wire outlet hole at the tail part of the ultrasonic vibrator fixing bin, the electrode wires are fed along the axial direction of the tangential vibrators, elliptical tracks staggered along the feeding direction are formed in the space, and a micro surface structure with pits is formed on the processing surface. The device has compact structure, does not need to change a machine tool, the electrode wire is periodically separated from a workpiece during processing, and the ultrasonic action on the working solution can generate cavitation effect, thereby being beneficial to discharging waste chips, effectively reducing the wire breakage rate, improving the processing efficiency, and forming micro texture on the surface of the workpiece to improve the service performance.

Description

Ultrasonic-assisted linear cutting microtexture forming device based on elliptical vibration

Technical Field

The utility model relates to an supersound electric spark combined machining technical field especially relates to a little texture forming device of supersound assisted linear cutting based on elliptical vibration.

Background

With the progress of science and technology, novel materials are continuously emerged, and the traditional wire cut electrical discharge machining technology cannot meet the machining requirements aiming at certain materials with uneven electrical conduction and heat conduction and multi-phase doping. Particularly in the field of micro electric spark machining, due to the fact that a discharge gap is small, a wire electrode is in continuous contact with a workpiece, chip removal is difficult, short circuit, wire breakage and other adverse phenomena are prone to occurring, and the problems of low machining efficiency, poor product precision and the like are caused.

The ultrasonic-assisted wire cut electrical discharge machining technology based on the elliptical vibration is characterized in that high-frequency ultrasonic elliptical vibration and the wire cut electrical discharge machining technology are combined, a regularly controllable fine surface structure can be formed on the surface of a workpiece material in the machining process, the service performance of the workpiece is improved, the contact environment of a wire electrode and the workpiece is improved, the machining stability is improved, and higher machining precision is obtained.

Disclosure of Invention

The utility model discloses the technical problem that will solve is: overcomes the defects of the prior art, and provides an ultrasonic-assisted linear cutting micro-texture forming device based on elliptical vibration, which has reasonable design, simple operation and strong processing capability.

In order to achieve the purpose, the utility model adopts the technical proposal that: an ultrasonic-assisted linear cutting microtexture forming device based on elliptical vibration comprises an orthogonal ultrasonic vibration system, an ultrasonic vibrator fixing bin, a workbench leveling structure and a sealing structure; the orthogonal ultrasonic vibration system comprises two half-wavelength conical amplitude-changing rods, a piezoelectric ceramic transducer and a two-dimensional ultrasonic power supply; the half-wavelength amplitude transformer and the piezoelectric ceramic transducer are connected through threads to form an ultrasonic vibrator, a lead welded on the piezoelectric ceramic transducer is connected with an external two-dimensional ultrasonic power supply through a wire outlet hole at the tail of the fixed bin, and the phase difference between the two vibrators can be adjusted through the power supply; the flange plate at the node of the amplitude transformer is pressed into the ultrasonic vibrator fixing bin by the pressing cap, and the included angle of the axes of the two vibrators is 90 degrees; the workbench leveling structure comprises three leveling studs with double-thread; a plane is milled in the middle of the leveling stud, and a cross groove is formed in the end face of the bottom of the leveling stud; the device base is provided with three threaded through holes corresponding to the leveling studs, and the bottom of the workbench is provided with three threaded blind holes corresponding to the leveling studs; the vibrator and the workbench are designed in a separated mode, a threaded hole is formed in the small end face of the amplitude transformer and connected with the corresponding threaded hole of the workbench, and the fixing bin is connected with the base in a threaded mode to achieve fixing.

On a plane formed by the axes of the two vibrators, the axis direction of the tangential vibrator is set to be the X direction, the X positive direction is the direction from the large end face to the small end face of the amplitude transformer of the tangential vibrator, the axis direction of the longitudinal vibrator is the Y direction, and the axial direction of the wire electrode is the Z direction; the workpiece with elliptical vibration is taken as a reference system, the motion trail equation of the wire electrode in the X direction is the composition of the tangential vibrator and the feeding motion, namely X = V_f·t+A₁Sin (ω · t); the Y direction is a high-frequency sinusoidal vibration of the longitudinal vibrator, i.e. Y = A₂Sin (ω · t + δ); wherein V_f，A₁，A₂Omega and delta are respectively the wire electrode feeding speed, the tangential vibrator amplitude, the longitudinal vibrator amplitude, the circular frequency and the phase difference, the two equations are compounded to form an elliptical motion track staggered along the feeding direction in an XOY plane, and the micro boundary stripes formed by staggering the ellipses are remapped on the surface of the processed workpiece to obtain a regular and controllable surface texture; by the formula, the amplitude, the ultrasonic frequency, the feeding speed and the phase difference between the two vibrators are adjusted to obtain the characteristics of different eccentricities, eccentric angles, elliptical staggered density in unit time, groove width and depth and the like.

The leveling structure of the workbench requires that the thread lines at the two ends of the leveling nut have the same rotation direction; the levelness of the working table can meet the processing requirements by adjusting the positions of the three studs. The workbench is provided with through holes with two specifications, the hole intervals between the two through holes are different, and the edge of the workbench is provided with a V-shaped groove so as to adapt to clamping of workpieces with different shapes and sizes. .

The sealing structure comprises three parts: the flange is sealed, the vibrator fixing bin is sealed, and the wire outlet hole is sealed. An annular groove is formed in the circumference between two end faces of the amplitude transformer flange plate of the vibrator, and the depth of the annular groove is required to be smaller than the line diameter of the O-shaped sealing ring and larger than one half of the line diameter; the first end face of the vibrator fixing bin is provided with an annular groove, the depth of the annular groove is required to be 1.5 times larger than the line diameter of the O-shaped sealing ring, and the width of the annular groove is required to be smaller than the line diameter; the first end surface of the pressing cap presses a flange on the vibrator into the vibrator fixing bin, rigid constraint is realized through threads, a sealing ring on a ring groove of the flange plate is tightly pressed by the inner wall of the fixing bin, and the second end surface of the pressing cap corresponding to the ring groove of the fixing bin presses the sealing ring into the groove; the lead is led out from the wire outlet hole of the vibrator fixing bin, and sealant is coated at the wire outlet hole to realize the sealing of the device.

And a 0.3mm allowance is reserved on the first end face of the vibrator fixing bin, so that the pressed flange is always higher than the first end face of the fixing bin, and the flange is guaranteed to be correctly constrained.

The utility model has the advantages that:

1. the utility model discloses utilize the elliptical vibration rationale, with elliptical vibration and electrode wire feed direction complex mutually, form in the plane along the crisscross elliptical motion orbit of feed direction, adjust amplitude, ultrasonic frequency, feed rate, phase difference between two oscillators is in order to obtain different eccentricities, eccentric angle, characteristics such as oval crisscross density and furrow width and degree of depth in the unit interval, the work piece surface remapping of crisscross formation between the ellipse can obtain the controllable fine surface structure of law behind the processing, improve the performance of work piece.

2. The utility model discloses compound ultrasonic machining technique and linear cutting technique mutually, the ultrasonic action can produce cavitation in the liquid to and elliptical vibration's return stroke action will greatly improve the contact environment of wire electrode and work piece, reduces disconnected silk rate, improves the processing stability, obtains higher machining precision.

3. The utility model has the advantages of reasonable design compactness, occupation space is little, easy operation, easily popularization and implementation has good economic benefits.

Drawings

Fig. 1 is one of the structural diagrams of an ultrasonic-assisted wire-cutting microtexture forming device based on elliptical vibration.

Fig. 2 is a second schematic structural diagram of an ultrasonic-assisted wire-cutting microtexture forming device based on elliptical vibration.

Fig. 3 is a third schematic structural diagram of an ultrasonic-assisted wire-cutting microtexture forming device based on elliptical vibration.

Fig. 4 is a schematic diagram of the structure of the ultrasonic vibrator.

Fig. 5 is one of the schematic structural diagrams of the vibrator fixing bin.

Fig. 6 is a second schematic diagram of the vibrator fixing chamber.

FIG. 7 is a schematic view of a fine adjustment thread configuration.

Fig. 8 is a schematic view of a press cap structure.

Fig. 9 is a schematic view of the structure of the workbench.

Detailed Description

Reference numerals in the drawings of the specification include: 1. the device comprises a supporting arm, 2, an upper working arm, 3, a workpiece, 4, a pressing plate, 5, a workbench, 6, a longitudinal vibrator, 7, a two-dimensional ultrasonic power supply, 8, a lower working arm, 9, an electrode wire, 10, a base, 11, a wire outlet hole, 12, a vibrator fixing bin, 13, a tangential vibrator, 14, a lead, 15, a pressing cap, 16, a first end face of the pressing cap, 17, a second end face of the pressing cap, 18, a first end face of the vibrator fixing bin, 19, a fixing threaded through hole, 20, a T-shaped bolt, 21, a piezoelectric ceramic transducer, 22, a flange sealing ring groove, 23, a half-wave long cone deformation amplitude rod, 24, a threaded blind hole, 25, a vibrator fixing bin inner cavity, 26, a sealing ring groove, 27, a flange fixing cavity, 28, a cross-shaped groove, 29, threads, 30, a threaded hole, 31, a fine tuning blind hole, 32, through holes of two.

The following is a specific embodiment of the present invention and the technical solution of the present invention is further described with reference to the accompanying drawings: the structural schematic diagrams of the ultrasonic-assisted linear cutting microtexture forming device based on elliptical vibration are shown in fig. 1, fig. 2 and fig. 3, and the device comprises an orthogonal ultrasonic vibration system, an ultrasonic vibrator fixing bin, a workbench leveling structure and a sealing structure. The orthogonal ultrasonic vibration system consists of two half-wavelength conical amplitude-changing rods 23, a piezoelectric ceramic transducer 21 and a two-dimensional ultrasonic power supply 7; the half-wavelength amplitude transformer 23 and the piezoelectric ceramic transducer 21 are connected through threads to form an ultrasonic vibrator, a lead 14 welded on the piezoelectric ceramic transducer 21 is connected with an external two-dimensional ultrasonic power supply 7 through a wire outlet hole 11 at the tail of the vibrator fixing bin 12, a pressing cap 15 presses a flange plate at the node of the amplitude transformer 23 into the vibrator fixing bin 12, and the axial included angle of the two vibrators is required to be 90 degrees; the ultrasonic vibrator and the workbench 5 are designed in a separated mode, the small end face of the half-wavelength conical amplitude-changing rod 23 is provided with a threaded blind hole 24 and is connected with a threaded hole 30 corresponding to the workbench 5, and the vibrator fixing bin 12 is in threaded connection with the base 10. All connecting surfaces in the vibration system are required to be tightly matched, so that energy loss is reduced; and a 0.3mm allowance is reserved on the first end surface 18 of the vibrator fixing bin, so that the pressed vibrator flange is always higher than the first end surface 18 of the vibrator fixing bin, and the flange is guaranteed to be correctly constrained.

The ring flange of the amplitude transformer of the vibrator is provided with a ring groove on the circumference, and the depth of the ring groove 22 for sealing the flange is required to be less than the line diameter of the O-shaped sealing ring and more than one half of the line diameter; the first end face 18 of the vibrator fixing bin is provided with a sealing ring groove 26, the groove depth is required to be 1.5 times larger than the line diameter of the O-shaped sealing ring, and the width is smaller than the line diameter; the first end surface 16 of the press cap presses the flange on the amplitude transformer into the vibrator fixed bin 12, rigid constraint is realized through threads, the sealing ring sleeved on the sealing ring groove 22 of the flange is pressed by the inner wall of the fixed bin, and the second end surface 17 of the press cap corresponding to the sealing ring groove 26 in the fixed bin presses the sealing ring into the groove; the lead 14 is led out from the outlet hole 11, and sealant is coated at the outlet hole 11 to realize the sealing of the device.

The fine adjustment bolt is screwed into the workbench fine adjustment blind hole 31 from the threaded through hole at the base 10, the workpiece 3 is placed on the workbench 5, different apertures are selected according to the size and the shape of the workpiece 3, and the workpiece 3 is clamped by the pressing plate 4 through the bolt. After the workpiece is clamped, the levelness of the workbench 5 is checked by using a micrometer, and the three fine tuning bolts are adjusted to enable the workbench 5 to reach an allowable tolerance range.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments still fall within the scope of the technical solution of the present invention.

Claims

1. An ultrasonic-assisted linear cutting micro-texture forming device based on elliptical vibration is characterized in that: the ultrasonic vibration device comprises an orthogonal ultrasonic vibration system, an ultrasonic vibrator fixing bin, a workbench leveling structure and a sealing structure; the orthogonal ultrasonic vibration system comprises two half-wavelength conical amplitude-changing rods, a piezoelectric ceramic transducer and a two-dimensional ultrasonic power supply; the half-wavelength amplitude transformer and the piezoelectric ceramic transducer are connected through threads to form an ultrasonic vibrator, a lead welded on the piezoelectric ceramic transducer is connected with an external two-dimensional ultrasonic power supply through a wire outlet hole at the tail of the fixed bin, and the phase difference between the two vibrators can be adjusted through the power supply; the flange plate at the node of the amplitude transformer is pressed into the ultrasonic vibrator fixing bin by the pressing cap, and the included angle of the axes of the two vibrators is 90 degrees; the workbench leveling structure comprises three leveling studs with double-thread; a plane is milled in the middle of the leveling stud, and a cross groove is formed in the end face of the bottom of the leveling stud; the device base is provided with three threaded through holes corresponding to the leveling studs, and the bottom of the workbench is provided with three threaded blind holes corresponding to the leveling studs; the vibrator and the workbench are designed in a separated mode, a threaded hole is formed in the small end face of the amplitude transformer and connected with the corresponding threaded hole of the workbench, and the fixing bin is connected with the base in a threaded mode to achieve fixing.

2. The ultrasonic-assisted linear cutting microtexture forming device based on elliptical vibration as claimed in claim 1, characterized in that: the elliptical vibration is on a plane formed by the axes of the two vibrators, the axis direction of the tangential vibrator is set to be the X direction, the X positive direction is the direction from the large end face to the small end face of the amplitude transformer of the tangential vibrator, the axis direction of the longitudinal vibrator is the Y direction, and the axial direction of the wire electrode is the Z direction; the workpiece with elliptical vibration is taken as a reference system, the motion trail equation of the wire electrode in the X direction is the composition of the tangential vibrator and the feeding motion, namely X = V_f·t+A₁Sin (ω · t); the Y direction is a high-frequency sinusoidal vibration of the longitudinal vibrator, i.e. Y = A₂Sin (ω · t + δ); wherein V_f，A₁，A₂Omega and delta are respectively the wire electrode feeding speed, the tangential vibrator amplitude, the longitudinal vibrator amplitude, the circular frequency and the phase difference, and the two equations are compounded to form elliptical motion staggered along the feeding direction in the XOY planeAnd (4) moving tracks.

3. The ultrasonic-assisted linear cutting microtexture forming device based on elliptical vibration as claimed in claim 1, characterized in that: the leveling structure of the workbench requires that the thread lines at the two ends of the leveling nut have the same rotation direction.

4. The ultrasonic-assisted linear cutting microtexture forming device based on elliptical vibration as claimed in claim 1, characterized in that: a ring groove is formed on the circumference between two end faces of the amplitude transformer flange plate of the vibrator, and the depth of the ring groove is required to be less than the line diameter of the O-shaped sealing ring and more than one half of the line diameter; the first end face of the vibrator fixing bin is provided with an annular groove, the depth of the annular groove is required to be 1.5 times larger than the line diameter of the O-shaped sealing ring, and the width of the annular groove is required to be smaller than the line diameter.

5. The ultrasonic-assisted linear cutting microtexture forming device based on elliptical vibration as claimed in claim 1, characterized in that: and a 0.3mm allowance is reserved on the first end face of the vibrator fixing bin, so that the pressed flange is always higher than the first end face of the fixing bin, and the flange is guaranteed to be correctly constrained.