CN103521414B - Inclined beam type Hybrid transducer Vibration changer - Google Patents

Abstract

The invention discloses a kind of inclined beam type Hybrid transducer Vibration changer, comprise tool heads, cant beam, studs, middle linkage section and lower tool heads, is the press-fit of plug-in type top between described upper tool heads, middle linkage section and cant beam.Axial bindiny mechanism by arranging between upper tool heads and lower tool heads, realizes combining closely of whole device.The present invention is reasonable in design, and structure is simple, is easy to the connection realizing workpiece, practical, utilizes this device that unidirectional longitudinal vibration transducer can be made to realize the output of Hybrid transducer vibration.

Description

Inclined beam type longitudinal torsion compound vibration conversion device

technical field

The invention relates to an inclined beam type longitudinal-torsion composite vibration conversion device, which is mainly used in ultrasonic processing equipment and belongs to the technical field of precision and ultra-precision processing.

Background technique

Traditional ultrasonic machining is mostly a single vibration mode. However, with the development of ultrasonic machining technology and continuous improvement of equipment, composite vibration modes such as longitudinal-torsion, longitudinal-bend and torsion-bend have also received extensive attention. Studies have shown that ultrasonic machining in the longitudinal-torsional composite vibration mode can not only reverse the direction of friction between the tool rake face and chips, but also promote the outflow of chips and inhibit the occurrence of "eating phenomenon". At the same time, due to the addition of tangential auxiliary vibration, this vibration mode makes the lubricating fluid lubricate the cutting area more conveniently, and a certain dynamic pressure oil film will also be generated between the tool rake face and the cutting surface, reducing the impact damage of the tool . (Pi Jun, Longitudinal-torsional compound vibration machining, "Journal of Mechanical Engineering").

After searching the existing technical literature, it is found that there are mainly two methods to realize longitudinal-torsional compound vibration in engineering applications. One is to use two sets of transducers composed of piezoelectric ceramics with different polarization directions or axial hysteresis torsion The transducer is used to excite the coupling of the two vibration modes. The disadvantage of this implementation is that the structural design is more complicated, and a two-phase electric excitation source is required; the other is through the special design of the structure of the horn. , such as spiral groove type, inclined groove type, mortise and tenon joint type and inclined top pressure fit type, etc. In the spiral groove structure, there are many factors affecting the longitudinal torsional resonance frequency, and the design is more difficult. However, for the chute type, mortise and tenon joint type, and inclined-plane press-fit structure, the structural design is all based on the principle of wave reflection and refraction. This type of structure is often complicated, and the processing and manufacturing costs are high.

Contents of the invention

In order to solve the deficiencies of the prior art, the present invention provides an oblique beam type longitudinal-torsion compound vibration conversion device, which realizes vertical Transformation of torsional compound vibrations.

In order to achieve the above object, the technical solution adopted by the present invention is: the present invention provides a slanted beam type longitudinal-torsional compound vibration conversion device, which includes an upper tool head, four slanted beams, double-ended studs, intermediate connections section and the lower tool head, the upper boss and the lower boss at both ends of the inclined beam respectively form a plug-in press fit with the groove of the upper tool head and the groove of the middle connecting section, and the double-ended studs sequentially connect the upper tool head, the middle The connecting section and the lower tool head are axially fixed.

Further, the threads at both ends of the double-ended stud are closely connected with the internal threads of the upper tool head and the lower tool head respectively, the thread rotation direction of the connection between the double-ended stud and the upper tool head is threaded connection, and the double-ended stud and the lower tool head The thread direction of the head connection is the threaded connection.

Further, the upper tool head and the lower tool head are both hollow cylinders, the non-grooved end of the upper tool head can be connected to various types of processing tools, and the non-grooved end of the lower tool head can be connected to exponential, conical , catenary type and stepped type horn or directly connected with the longitudinal vibration transducer.

Further, the inner diameter of the intermediate connecting section is slightly larger than the diameter of the double-ended stud.

Further, the end of the upper tool head is provided with four evenly distributed planar upper tool head grooves, and the end of the intermediate connecting section is also provided with four evenly distributed planar intermediate connecting section grooves; the four oblique Both ends of the beam are provided with a plane-type upper boss and a plane-type lower boss, which are respectively formed corresponding to the plane-type upper tool head groove and the plane-type middle connecting section groove plug structure.

Further, the four inclined beams have the same structure, the inner side of the inclined beams is a plane, and the outer side of the inclined beams is a curved surface, which is joined with the outer circular curved surface of the upper tool head and the middle connecting section.

The beneficial effects of the present invention are:

After adopting the above scheme, the present invention is composed of an upper tool head, an inclined beam, a stud, an intermediate connection section and a lower tool head. One end of the upper tool head and one end of the inclined beam are press-fitted by plugging, and the other end of the inclined beam and the middle connecting section are press-fitted by inserting. The device connects the upper tool head and the lower tool head through the threads at both ends of the double-ended stud, so as to realize the tight connection of the device. The invention is reasonable in design, simple in structure, easy to realize the connection of workpieces, and strong in practicability. By using the device, the unidirectional longitudinal vibration transducer can realize the output of longitudinal torsional compound vibration.

The basic principle of the technical solution of the present invention is as follows: (1) The longitudinal vibration transmitted by the transducer or the horn will be decomposed into the vibration along the direction of the inclined beam and the vibration perpendicular to the direction of the inclined beam at the root of the inclined beam . When the excitation frequency of these two vibrations is the same as or close to the local bending vibration frequency of the inclined beam, the longitudinal resonance and bending resonance of the inclined beam will be induced respectively. Wherein, the effect of this bending vibration can be equivalent to the torsional vibration of the inclined beam along the circumferential surface of the torus from the perspective of the cross section of the torus. Therefore, the inclined beam structure in the torus can convert the longitudinal vibration into torsional vibration, realizing the coupling of the two modes. (2) The structural damping in the inclined beam section of the ring will cause a certain phase difference between the longitudinal vibration and torsional vibration at the output end, thereby realizing the longitudinal and torsional compound elliptical vibration of the tool.

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the top view of Fig. 1;

Figure 3 is an axonometric view of the system of the present invention;

Fig. 4 is a partial assembly drawing of the present invention;

Fig. 5 is the axial side view of the double-ended stud of the present invention;

Fig. 6 is an exploded exploded view of the system of the present invention.

Detailed ways

As shown in Figures 1 to 3, the inclined beam type longitudinal-torsional compound vibration conversion device of the present invention includes an upper tool head 5, four inclined beams 4, studs 3, an intermediate connecting section 2 and a lower tool head 1, the inclined The upper boss 7 and the lower boss 8 at both ends of the beam 4 form a plug-in press fit with the upper tool head groove 6 and the middle connecting section groove 9 respectively, and the double-ended stud 3 sequentially connects the upper tool head 5 and the middle connecting section 2 and the lower tool head 1 are axially fixed; as shown in Figure 5, the threads at both ends of the double-ended stud 3 are closely connected with the internal threads of the upper tool head 5 and the middle connecting section 2 respectively, and the threads at both ends of the double-ended stud 3 The external thread is opposite to the internal thread of the upper tool head 5 and the lower tool head 1 . The upper tool head 5 and the lower tool head 1 are both hollow cylinders, the non-grooved end of the upper tool head 5 can be connected to various types of processing tools, and the non-grooved end of the lower tool head 1 can be connected to index-type, Conical, catenary and stepped horns may be directly connected to the longitudinal vibration transducer. The inner diameter of the intermediate connecting section 2 is slightly larger than the diameter of the stud 3 . As shown in Figure 4, the end of the upper tool head 5 is provided with four evenly distributed planar upper tool head grooves 6, and the end of the intermediate connecting section 2 is also provided with four evenly distributed planar intermediate connecting section grooves. groove 9; the two ends of the four inclined beams 4 are provided with a plane-type upper boss 7 and a plane-type lower boss 8, and the plane-type upper boss 7 and the plane-type lower boss 8 are respectively connected with the plane-type upper tool The head groove 6 and the planar intermediate connection section groove 9 correspond to form a plug-in structure. The four inclined beams 4 have the same structure. The inner side of the inclined beams 4 is a plane, and the outer side of the inclined beams 4 is a curved surface, which is joined with the outer circular curved surface of the upper tool head 5 and the intermediate connecting section 2 .

The usage method of the present invention:

As shown in Figure 6, when working, screw the upper tool head 5 on one end of the double-ended stud, insert the inclined beam 4 into its four grooves after fixing, and connect the middle connecting section 2 from the other end of the double-ended stud. One end is put on and combined with the inclined beam, and finally the lower tool head 1 is screwed onto the stud, and screwed into the middle connecting section 2, so that the inclined beam 4 fits closely with the upper tool head 5 and the middle connecting section 2, realizing Reliable connection can form the device.

Provide the application example of the present invention below:

Since the longitudinal vibration and torsional vibration satisfy the half-wavelength superposition principle, the structure of the conversion device is designed according to the half-wavelength. The materials of the device are all selected from 45# steel with a density of , Young's modulus is , the Poisson's ratio of the material is 0.28. The outer diameters of the upper tool head, the middle connecting section and the lower tool head are , the lengths are: 20mm, 10mm, 20mm. Wherein, the groove on the upper tool head and the middle connecting section is 4mm deep and 7mm wide. The total height of the inclined beam is 15mm, and the height of the bosses at both ends is 4mm. The overall length of the stud is 29mm, and the threads at both ends are . Utilize finite element analysis software Ansys to carry out modal analysis to the patent of the present invention. Under the premise of satisfying engineering applications, when performing modal analysis, the contour dimensions of all threads are simplified according to their diameters. The modal analysis results show that the patented longitudinal-torsional coupling frequency of the present invention is 34936 Hz. Therefore, when the external longitudinal vibration frequency is around 35000 Hz, the present invention performs longitudinal-torsional compound vibration.

The protection scope of the present invention is not limited to the above-mentioned embodiments, and any obvious technical deformation made according to the principle of the technical scheme of the present invention falls within the protection scope of the present invention.

Claims (6)

1. An inclined beam type longitudinal-torsion compound vibration conversion device, characterized in that the inclined beam type longitudinal-torsion compound vibration conversion device includes an upper tool head (5), four inclined beams (4), double-ended studs (3), intermediate connections section (2) and the lower tool head (1), the upper boss (7) and the lower boss (8) at both ends of the inclined beam (4) are respectively connected with the groove of the upper tool head (6) and the groove of the middle connecting section (9) A plug-in top press fit is formed, and the double-ended stud (3) axially fixes the upper tool head (5), the middle connecting section (2) and the lower tool head (1) in sequence. 2. The oblique beam type longitudinal-torsion compound vibration conversion device according to claim 1, characterized in that the two ends of the double-ended stud (3) are threadedly connected to the upper tool head (5) and the lower tool head (1) respectively . 3. The oblique beam type longitudinal-torsional compound vibration conversion device according to claim 2, characterized in that, the upper tool head (5) and the lower tool head (1) are both hollow cylinders, and the upper tool head (5) The non-grooved end can be connected with various types of processing tools, and the non-grooved end of the lower tool head (1) can be connected with exponential, conical, catenary and stepped horns or directly connected with longitudinal vibration transducers . 4. The oblique beam type longitudinal-torsional compound vibration conversion device according to claim 3, characterized in that, the diameter of the inner circle of the intermediate connecting section (2) is slightly larger than the diameter of the double-ended stud (3). 5. The oblique beam type longitudinal-torsion compound vibration conversion device according to claim 4, characterized in that, the end of the upper tool head (5) is provided with four evenly distributed planar upper tool head grooves (6), the The end of the intermediate connecting section (2) is also provided with four evenly distributed planar intermediate connecting section grooves (9); both ends of the four inclined beams (4) are provided with a planar upper boss (7) and a plane Type lower boss (8), the plane type upper boss (7) and the plane type lower boss (8) are respectively connected with the plane type upper tool head groove (6) and the plane type middle connecting section groove (9) Correspondingly form a plug structure. 6. The inclined beam type longitudinal-torsional compound vibration conversion device according to claim 5, characterized in that, the four inclined beams (4) have the same structure, the inner side of the inclined beams (4) is a plane, and the outer side of the inclined beams (4) is curved surface, and jointed with the outer circular curved surface of the upper tool head (5) and the middle connecting section (2).