CN215545161U - Low-frequency vibrator capable of adjusting amplitude through spiral feeding - Google Patents
Low-frequency vibrator capable of adjusting amplitude through spiral feeding Download PDFInfo
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- CN215545161U CN215545161U CN202120076258.5U CN202120076258U CN215545161U CN 215545161 U CN215545161 U CN 215545161U CN 202120076258 U CN202120076258 U CN 202120076258U CN 215545161 U CN215545161 U CN 215545161U
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Abstract
The embodiment of the utility model discloses a low-frequency vibrator for adjusting amplitude by spiral feeding, which mainly comprises: the vibration mechanism comprises an input shaft, a cylindrical excitation cam, a butterfly spring, an amplitude modulation screw and a vibration shaft; the upper end of the input shaft is matched with the machining center to input rotary motion; the input shaft and the vibration shaft are matched through splines to transmit rotary motion, and the vibration shaft is allowed to rotate and simultaneously axially move; a cutter is assembled at the lower end of the vibration shaft, an annular sine arc-shaped groove is formed in an annular convex shoulder of the vibration shaft, and the annular sine arc-shaped groove is matched with the cylindrical excitation cam to output axial sine vibration; the butterfly spring is matched with the vibrating shaft to provide restoring force; the amplitude-modulated screw acts on the upper end face of the vibrating shaft through screw feeding, and the acting gap between the cylindrical excitation cam and the sinusoidal arc-shaped groove of the vibrating shaft can be adjusted, so that the output amplitude of the disclosed low-frequency vibrator is adjusted. The utility model reduces the difficulty of amplitude adjustment of the low-frequency vibrator and solves the problems of low hole machining efficiency and poor quality of small-diameter deep holes with large length-diameter ratio or difficult-to-machine materials.
Description
Technical Field
The present application relates to, but is not limited to, the field of low frequency vibration assisted drilling technology, and more particularly, to a low frequency vibrator with amplitude adjusted by screw feeding.
Background
The low-frequency vibration auxiliary drilling technology is an important branch of special processing technology and is the first choice for special material drilling and processing and small-diameter deep hole drilling and processing with large length-diameter ratio.
Drilling is a machining process in a closed state, and a narrow gap between the side wall of the cutter and the hole wall easily causes accumulation of chips, so that a chip removal channel is blocked. Along with the reduction of the diameter and the increase of the hole depth, the longer the chip removal path is, the greater the difficulty of chip removal is, the more easily the chips are accumulated in the chip removal channel, and the more serious friction phenomenon between the chips and the hole wall is caused, so that the temperature of a cutting area is increased sharply, the processed hole wall is damaged, and the roughness of the surface of the hole is seriously influenced.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is as follows: in order to solve the technical problem, an embodiment of the utility model provides a low-frequency vibrator for adjusting amplitude by spiral feeding, so as to solve the problems that in the existing drilling process, the chip removal difficulty of a small-diameter deep hole with a large length-diameter ratio is high, the processed hole wall is damaged due to the accumulation of chips, the roughness of the hole surface is seriously influenced, and the like.
The technical scheme of the utility model is as follows: the embodiment of the utility model provides a low-frequency vibrator for adjusting amplitude by screw feeding, which comprises: the device comprises a shell 12 with a hole shoulder in the middle, a connecting screw 2, an input shaft 1, a deep groove ball bearing 3, a cylindrical excitation cam 4, a butterfly spring 5, a lower baffle 6, an amplitude modulation screw 9, a positioning sleeve 10, a vibration shaft 11 and a sliding bearing 13, wherein the input shaft 1, the deep groove ball bearing 3, the cylindrical excitation cam, the butterfly spring 5, the lower baffle 6, the amplitude modulation screw 9, the positioning sleeve 10, the vibration shaft 11 and the sliding bearing 13 are arranged in the shell 12;
the lower end of the input shaft 1 is connected with the upper end of the vibration shaft 11 through spline structures on respective end faces, the central shafts are overlapped, internal threads are arranged in a central shaft hole of the input shaft 1, so that an amplitude-modulated screw 9 penetrates through the central shaft hole through thread fit and then abuts against the central position of the upper end face of the vibration shaft 11, and a cutter is mounted at the lower end of the vibration shaft 11;
an annular shaft shoulder is formed between the driving rotating part at the upper section of the input shaft 1 and the transmission rotating part at the lower section of the input shaft 1, and the deep groove ball bearing 3 is arranged between the shaft shoulder of the input shaft 1 and the shell 12; an annular convex shoulder is arranged between the upper section connecting vibration part and the lower section vibration recovery part of the vibration shaft 11, an annular sine arc-shaped groove is arranged on the upper end face of the annular convex shoulder, the cylindrical excitation cam 4 is arranged on the hole shoulder of the shell 12 and is positioned on the annular convex shoulder of the vibration shaft 11, and a sine cam structure matched with the annular sine arc-shaped groove is arranged on the lower end face of the cylindrical excitation cam; the positioning sleeve 10 is sleeved outside the transmission rotating part of the input shaft 1 and is positioned between the deep groove ball bearing 3 and the cylindrical excitation cam 4;
the butterfly spring 5 is arranged in a ring cavity formed by a vibration return part at the lower section of the vibration shaft 11 and the shell 12, and a lower baffle 6 fixedly arranged at the bottom end of the shell 12 through a connecting screw 2 is used for limiting the axial position of the butterfly spring 5; the sliding bearing 13 is sleeved outside the vibration recovery part of the vibration shaft 11 and is positioned at the bottom of the butterfly spring 5, and the sliding bearing 13 is fixedly connected with the lower baffle 6 through the connecting screw 2;
the low-frequency vibrator with the amplitude adjusted through spiral feeding is used for providing rotary motion through an input shaft 1 which is connected with a main shaft in a matched mode, enabling the vibration shaft 11 to move axially while rotating through a spline connection structure between the input shaft 1 and the vibration shaft 11, and providing restoring force for the vibration shaft 11 in a vibration process through a butterfly spring 5, so that output axial sinusoidal vibration is used through the matching of an excitation cylindrical cam 4 and a sinusoidal vibration structure of an annular convex shoulder in the vibration shaft 11, and a cutter mounted at the lower end of the vibration shaft 11 is driven to perform drilling machining through the axial sinusoidal vibration; and the device is also used for changing the fit clearance of the cylindrical excitation cam 4 and the annular sine arc-shaped groove in the vibration shaft 11 through the spiral feeding motion of the amplitude-modulated screw 9 in the input shaft 1, thereby adjusting the amplitude of the low-frequency vibrator.
Alternatively, in the screw-feed amplitude-adjusted low-frequency vibrator as described above,
a circular groove is formed in the bottom end of the transmission rotating part in the input shaft 1, a spline groove is formed in the end face of the circular groove, a spline shaft is arranged on the upper end face of the vibration shaft 11, the spline shaft of the vibration shaft 11 is embedded into the circular groove and forms a spline structure with the spline groove, so that the input shaft 1 and the vibration shaft 11 transmit the rotating motion of the input shaft 1 through the spline connection structure, and the vibration shaft 11 rotates and moves axially;
the middle part of the upper end face of the vibration shaft 11 is provided with a circular groove, so that the lower end of the amplitude-modulated screw 9 directly abuts against the circular groove, and the center of the lower end is provided with an internal thread hole for installing a cutter.
Alternatively, in the screw-feed amplitude-adjusted low-frequency vibrator as described above,
the upper end face of the annular convex shoulder of the vibration shaft 11 is provided with an annular sine arc-shaped groove, and the lower end face of the cylindrical excitation cam 4 is provided with N periodic sine cam structures which are used for vibrating in a matched mode with the annular sine arc-shaped groove.
Optionally, in the low-frequency vibrator for regulating amplitude by screw feeding as described above, the inner ring of the deep groove ball bearing 3 is in interference fit with the input shaft 1, and the outer ring is in interference fit with the inner wall of the housing 12;
the cylindrical excitation cam 4 is in interference fit with the inner wall of the shell 12 and is used for limiting the cylindrical excitation cam 4 to rotate;
the positioning sleeve 10 is in interference fit with the inner wall of the shell 12 and is used for axially positioning the cylindrical excitation cam 4.
Optionally, the low frequency oscillator with screw feed amplitude adjustment as described above further includes: an upper bearing end cap 8;
the upper bearing end cover 8 is fixedly connected to the top end of the shell 12 through a connecting screw 2 and is used for protecting the inner cavity environment of the deep groove ball bearing 3 and the shell 12.
Optionally, the low frequency oscillator with screw feed amplitude adjustment as described above further includes: a lower bearing end cap 7;
the lower bearing end cover 7 is fixedly connected to the bottom end of the lower baffle 6 through the connecting screw 2, and is used for protecting the inner cavity environment of the sliding bearing 13 and the shell 12.
Alternatively, in the low frequency vibrator for screw-feeding amplitude adjustment as described above, 8 to 12 disc springs are included in the disc spring 5.
The utility model has the beneficial effects that: according to the low-frequency vibrator with the amplitude adjusted through spiral feeding, provided by the embodiment of the utility model, the upper end of an input shaft 1 can be matched with a main shaft of a machining center to output rotary motion, a vibration shaft 11 is connected with the input shaft 1 through a spline to allow the vibration shaft 11 to axially move while rotating, a cylindrical excitation cam 4 is matched with an annular sine arc-shaped groove of the vibration shaft 11 to output axial sine vibration through relative motion matching, the lower end of the vibration shaft 11 is connected with a clamping tool through threads, so that drilling machining assisted by low-frequency vibration is realized, the upper end surface of the vibration shaft 11 is extruded through spiral feeding of an amplitude-adjusting screw 9, and the vibration shaft 11 moves downwards under the feeding extrusion of the amplitude-adjusting screw 9 to change the matching gap between the cylindrical excitation cam 4 and the annular sine arc-shaped groove, so that the action stroke of the cylindrical excitation cam 4 is adjusted, and the amplitude adjustment is realized.
By adopting the low-frequency vibrator provided by the embodiment of the utility model to execute drilling processing, controllable axial sinusoidal vibration is added to a cutter, a cutting area can be opened by the vibration mode, the traditional continuous drilling mode is changed into an intermittent drilling mode, and the low-frequency vibrator has the following advantages: on one hand, the continuous spiral long chip can be effectively changed into a chip type unit chip, so that the chip can be smoothly discharged; on the other hand, the cutting zone is opened by the periodical separation of the cutting edge and the cutting zone, so that the cutting zone can be completely surrounded by the cutting fluid and is sufficiently cooled and lubricated, thereby reducing the cutting temperature and improving the processing quality and the processing efficiency of the hole; on the other hand, the introduction of the amplitude modulation screw 9 improves the simplicity and convenience of amplitude modulation of the low-frequency vibrator, and the processing efficiency and the processing quality of drilling processing.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the example serve to explain the principles of the utility model and not to limit the utility model.
Fig. 1 is a schematic structural diagram of a low-frequency vibrator with screw feed for adjusting amplitude according to an embodiment of the present invention;
FIG. 2 is a top view of a vibration shaft of a low frequency vibrator with amplitude adjusted by screw feeding according to an embodiment of the present invention;
fig. 3 is a front view of a cylindrical excitation cam in a low-frequency vibrator for screw feeding amplitude adjustment according to an embodiment of the present invention;
FIG. 4 is a bottom view of the cylindrical excitation cam provided in the embodiment of FIG. 3;
figure 5 is a cross-sectional view of a cylindrical excitation cam provided in the embodiment of figure 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The drill bit aims at the problems that the existing drilling machining has high chip removal difficulty for a small-diameter deep hole with a large length-diameter ratio, and the machined hole wall is damaged due to the accumulation of chips, so that the roughness of the surface of the hole is seriously influenced, and the like. Although a low-frequency vibrator has been proposed in the conventional auxiliary cutting tool, the conventional low-frequency vibrator is either a vibrator with a fixed amplitude, or the amplitude of the conventional low-frequency vibrator can be adjusted, but the conventional low-frequency vibrator has the problems of complicated amplitude adjustment, high difficulty and the like, and the drilling efficiency is reduced. Therefore, it is desirable to design a low frequency vibrator with simple and convenient amplitude adjustment.
Based on the problems of complex amplitude regulation, high difficulty and the like of the existing low-frequency vibrator. The embodiment of the utility model provides a low-frequency vibrator for adjusting amplitude by spiral feeding, which enables the amplitude adjustment of the low-frequency vibrator to be simpler and more convenient, so that the processing efficiency and the processing quality of low-frequency vibration-assisted drilling of small-diameter deep holes with large length-diameter ratio or holes made of difficult-to-process materials are improved.
The following specific embodiments of the present invention may be combined, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 1 is a schematic structural diagram of a low-frequency vibrator with screw feed for adjusting amplitude according to an embodiment of the present invention. As shown in fig. 1, the low frequency vibrator with screw feed amplitude adjustment provided by the embodiment of the utility model can be applied to drilling operation of a deep hole with a small diameter and a large length-diameter ratio or a difficult-to-machine material, and the low frequency vibrator can include: the device comprises a shell 12 with a hole shoulder in the middle, a connecting screw 2, an input shaft 1 arranged in the shell 12, a deep groove ball bearing 3, a cylindrical excitation cam 4, a butterfly spring 5, a lower baffle 6, an amplitude modulation screw 9, a positioning sleeve 10, a vibration shaft 11 and a sliding bearing 13.
In the structure of the low-frequency vibrator for regulating amplitude by screw feeding as shown in fig. 1, the lower end of an input shaft 1 and the upper end of a vibration shaft 11 in the embodiment of the utility model are connected through spline structures on the respective end surfaces, the central shafts are overlapped, an internal thread is arranged in the central shaft hole of the input shaft 1, and an amplitude regulating screw 9 can be assembled; specifically, the amplitude-modulated screw 9 penetrates through the central shaft hole through threaded fit and then butts against the central position of the upper end face of the vibration shaft 11; in addition, a cutter for performing drilling work is mounted to a lower end of the vibration shaft 11.
As shown in fig. 1, in the embodiment of the present invention, the active rotation portion at the upper stage and the transmission rotation portion at the lower stage of the input shaft 1 are different from each other, and an annular shoulder is formed between the small-end active rotation portion and the large-end transmission rotation portion, and the deep groove ball bearing 3 may be installed between the shoulder of the input shaft 1 and the housing 12. In addition, an annular convex shoulder is arranged between the vibration part connected with the upper section of the vibration shaft 11 and the vibration recovery part connected with the lower section of the vibration shaft, an annular sine arc-shaped groove is arranged on the upper end face of the annular convex shoulder, the cylindrical excitation cam 4 is arranged on the hole shoulder of the shell 12 and is positioned on the annular convex shoulder of the vibration shaft 11, and a sine cam structure matched with the annular sine arc-shaped groove is arranged on the lower end face of the cylindrical excitation cam; the positioning sleeve 10 is sleeved outside the transmission rotating part of the input shaft 1 and is positioned between the deep groove ball bearing 3 and the cylindrical excitation cam 4.
As shown in fig. 1, a butterfly spring 5 in the embodiment of the present invention is installed in an annular cavity formed by a vibration recovery portion of a lower section of a vibration shaft 11 and a housing 12, and a lower baffle 6 fixedly installed at a bottom end of the housing 12 through a connection screw 2 is used for limiting an axial position of the butterfly spring 5; the sliding bearing 13 is sleeved outside the vibration recovery part of the vibration shaft 11 and is positioned at the bottom of the butterfly spring 5, and the sliding bearing 13 is fixedly connected with the lower baffle 6 through the connecting screw 2.
Based on the hardware structure of the low-frequency vibrator for adjusting the amplitude by screw feeding provided by the above embodiment of the utility model, the working mode of the low-frequency vibrator for adjusting the amplitude by screw feeding is as follows: on one hand, the input shaft 1 which is matched and connected with the main shaft provides rotary motion, the vibration shaft 11 can perform axial motion while performing rotary motion through a spline connection structure between the input shaft 1 and the vibration shaft 11, and restoring force in the vibration process can be provided for the vibration shaft 11 through the butterfly spring 5; therefore, axial sinusoidal vibration is output by matching the cylindrical excitation cam 4 with a sinusoidal vibration structure of the annular shoulder of the vibration shaft 11, so that a cutter mounted at the lower end of the vibration shaft 11 is driven to perform drilling machining through axial sinusoidal vibration; on the other hand, the fit clearance of the circular sine arc-shaped groove in the cylindrical excitation cam 4 and the vibration shaft 11 is changed through the spiral feeding motion of the amplitude-modulated screw 9 in the input shaft 1, so that the action stroke of the cylindrical excitation cam 4 is adjusted, and the amplitude of the low-frequency vibrator can be conveniently and quickly adjusted.
As shown in fig. 1, in a specific implementation of the embodiment of the present invention, a circular groove is formed at a bottom end of a transmission and rotation part in an input shaft 1, a spline groove is formed at an end surface of the circular groove, a spline shaft is formed at an upper end surface of a vibration shaft 11, and the spline shaft of the vibration shaft 11 is embedded in the circular groove and forms a spline structure with the spline groove, so that the input shaft 1 and the vibration shaft 11 transmit a rotation motion of the input shaft 1 through the spline connection structure, and the vibration shaft 11 performs an axial motion while rotating.
Optionally, as shown in fig. 1, in the embodiment of the present invention, a circular groove is disposed in the middle of the upper end surface of the vibration shaft 11, so that the lower end of the amplitude-modulated screw 9 directly abuts against the circular groove, and an internal threaded hole is disposed in the center of the lower end for installing a tool.
Fig. 2 is a plan view of a vibration shaft in a low frequency vibrator for amplitude adjustment by screw feeding according to an embodiment of the present invention, fig. 3 is a front view of a cylindrical excitation cam in a low frequency vibrator for amplitude adjustment by screw feeding according to an embodiment of the present invention, fig. 4 is a bottom view of the cylindrical excitation cam according to the embodiment shown in fig. 3, and fig. 5 is a cross-sectional view of the cylindrical excitation cam according to the embodiment shown in fig. 3. Referring to fig. 2 to 5, an upper end surface of an annular shoulder of the vibration shaft 11 of the embodiment of the present invention is provided with an annular sinusoidal arc-shaped groove; correspondingly, the lower end face of the cylindrical excitation cam 4 is provided with a sinusoidal cam structure with N periods for vibration in cooperation with the annular sinusoidal arc-shaped groove.
In practical application, the following structures are in interference fit installation mode:
firstly, an inner ring of the deep groove ball bearing 3 is in interference fit with the input shaft 1, and an outer ring of the deep groove ball bearing is in interference fit with the inner wall of the shell 12 and is used for the rotation motion of the input shaft 1;
secondly, the cylindrical excitation cam 4 is in interference fit with the inner wall of the shell 12 and is used for limiting the cylindrical excitation cam 4 to rotate;
thirdly, the positioning sleeve 10 is in interference fit with the inner wall of the shell 12 and is used for axially positioning the cylindrical excitation cam 4.
Further, the low frequency vibrator provided in the embodiment of the present invention further includes: an upper bearing end cap 8 and a lower bearing end cap 7.
As shown in fig. 1, the upper bearing end cap 8 is fixedly connected to the top end of the housing 12 through a connecting screw 2, and is used for protecting the inner cavity environment of the deep groove ball bearing 3 and the housing 12; the lower bearing end cover 7 is fixedly connected to the bottom end of the lower baffle 6 through the connecting screw 2, and is used for protecting the sliding bearing 13 and the inner cavity environment of the shell 12.
In practical application, in the embodiment of the present invention, the sliding bearing 13 is in threaded connection with the lower baffle 6, and the lower baffle 6 is in threaded connection with the housing 12; the upper bearing end cover 8 is in threaded connection with the shell 12, and the lower bearing end cover 7 is in threaded connection with the lower baffle 6.
Optionally, the butterfly spring 5 in the embodiment of the present invention includes 8 to 12 butterfly springs, and may be configured as 10 butterfly springs, for example.
According to the low-frequency vibrator with the amplitude adjusted by spiral feeding provided by the embodiment of the utility model, the upper end of an input shaft 1 can be matched with a main shaft of a machining center to output rotary motion, a vibration shaft 11 is connected with the input shaft 1 through a spline to allow the vibration shaft 11 to axially move while rotating, a cylindrical excitation cam 4 is matched with an annular sine arc-shaped groove of the vibration shaft 11 to output axial sine vibration in a matching way through relative motion, the lower end of the vibration shaft 11 is connected with a clamping tool through threads, so that drilling machining assisted by low-frequency vibration is realized, the upper end surface of the vibration shaft 11 is extruded through spiral feeding of an amplitude adjusting screw 9, and the downward movement of the vibration shaft 11 under the feeding extrusion of the amplitude adjusting screw 9 can change the matching gap between the cylindrical excitation cam 4 and the annular sine arc-shaped groove, so that the action stroke of the cylindrical excitation cam 4 is adjusted, and the amplitude adjustment is realized.
In the low-frequency vibrator provided by the embodiment of the utility model, a controllable axial sinusoidal vibration is added to the cutter, the vibration mode can open a cutting area, the traditional continuous drilling mode is changed into an intermittent drilling mode, and the low-frequency vibrator has the following advantages: on one hand, the continuous spiral long chip can be effectively changed into a chip type unit chip, so that the chip can be smoothly discharged; on the other hand, the cutting zone is opened by the periodical separation of the cutting edge and the cutting zone, so that the cutting zone can be completely surrounded by the cutting fluid and is sufficiently cooled and lubricated, thereby reducing the cutting temperature and improving the processing quality and the processing efficiency of the hole; on the other hand, the introduction of the amplitude modulation screw 9 improves the simplicity and convenience of amplitude modulation of the low-frequency vibrator, and the processing efficiency and the processing quality of drilling processing.
The following describes in detail an implementation of a low frequency vibrator for adjusting amplitude by spiral feeding according to an embodiment of the present invention with a specific implementation example.
As shown in fig. 1 to 5, the low-frequency vibrator for adjusting amplitude by screw feeding provided by the present embodiment specifically includes: the vibration damper comprises an input shaft 1, a connecting screw 2, a deep groove ball bearing 3, a cylindrical excitation cam 4, a butterfly spring 5, a lower baffle 6, a lower bearing end cover 7, an upper bearing end cover 8, an amplitude-modulation screw 9, a positioning sleeve 10, a vibration shaft 11, a shell 12 and a sliding bearing 13.
As shown in fig. 1, in the present embodiment, the lower end of the input shaft 1 is provided with spline grooves, the upper end of the vibration shaft 11 is provided with spline shafts, and the input shaft 1 and the vibration shaft 11 can be connected by splines to transmit the rotational motion of the input shaft while allowing the vibration shaft 11 to perform an axial motion while rotating. The central shaft hole of the input shaft 1 is provided with internal threads, an amplitude adjusting screw 9 can be assembled, and the amplitude adjusting screw 9 can perform spiral feeding motion in the input shaft. The lower end of the vibration shaft 11 is provided with internal threads, and a cutter can be assembled in a threaded connection mode; in addition, the middle upper end of the vibration shaft 11 is provided with an annular convex shoulder, and the upper end surface of the annular convex shoulder is provided with an annular sine arc-shaped groove. The deep groove ball bearing 3 is arranged on a shaft shoulder of the input shaft 1, an inner ring of the deep groove ball bearing 3 is in interference fit with the input shaft 1, and an outer ring of the deep groove ball bearing 3 is in interference fit with the inner wall of the shell 12 and used for the rotation motion of the input shaft 1. The cylindrical excitation cam 4 is provided with a sinusoidal cam structure with N periods, the cylindrical excitation cam 4 is installed on a hole shoulder of the shell 12 and is in interference fit with the inner wall of the shell 12, the rotary motion of the cylindrical excitation cam 4 can be limited, and the cylindrical excitation cam 4 is matched with an annular sinusoidal arc-shaped groove of the vibration shaft 11. The positioning sleeve 10 is sleeved outside the large ring of the input shaft 1, is installed between the outer ring of the deep groove ball bearing 3 and the cylindrical excitation cam 4, is in interference fit with the inner wall of the shell 12, and can realize axial positioning of the cylindrical excitation cam 4. The butterfly spring 5 is installed in an annular cavity formed by the vibration shaft 11 and the shell 12, and the axial position of the butterfly spring 5 is limited by the lower baffle 6 installed at the bottom end of the shell 12, so that restoring force can be provided for the vibration shaft 11. The lower baffle 6 is fixedly connected with the shell 12 through a connecting screw 2. The sliding bearing 13 is fixedly connected with the lower baffle 6 through the connecting screw 2, and the axial movement precision of the vibration shaft 11 can be ensured. The upper bearing end cover 8 is fixedly connected with the shell 12 through the connecting screw 2, so that the inner cavity environment of the deep groove ball bearing 3 and the shell 12 can be protected. The lower bearing end cover 7 is fixedly connected with the lower baffle 6 through the connecting screw 2, so that the inner cavity environment of the sliding bearing 13 and the shell 12 can be protected.
Referring to the sinusoidal vibration structure shown in fig. 2 to 5, in the present embodiment, the upper end surface of the annular shoulder provided at the upper end in the vibration shaft 11 is provided with an annular sinusoidal arc-shaped groove. And an annular sine cam structure matched with the annular sine arc-shaped groove is arranged on the cylindrical excitation cam 4. Because the cylindrical excitation cam 4 is in interference fit with the inner wall of the shell 12 and is axially positioned under the action of the positioning sleeve 10, namely the cylindrical excitation cam 4 is fixed in the axial direction, the cylindrical excitation cam 4 and the shell 12 are in a static state, when the vibration shaft 11 rotates under the action of the input shaft 1, the annular sine cam structure of the cylindrical excitation cam 4 can perform relative rotation motion in the annular sine arc-shaped groove, and the vibration shaft 11 can realize axial sine vibration under the action of the cylindrical excitation cam 4.
As shown in fig. 1, in the present embodiment, the upper end surface of the vibration shaft 11 is provided with a circular groove, the lower end surface of the amplitude-modulated screw 9 can directly contact with the circular groove, and the vibration shaft 11 is pressed by the amplitude-modulated screw 9, and the vibration shaft 11 moves downward under the screw feeding action of the amplitude-modulated screw 9, so that the fit clearance between the cylindrical excitation cam 4 and the annular sinusoidal arc groove is changed, the action stroke of the cylindrical excitation cam 4 is adjusted, and the amplitude adjustment can be realized.
When the low-frequency vibrator for adjusting the amplitude by spiral feeding works, the upper end of an input shaft 1 is matched with a main shaft of a machining center to input rotary motion, the input shaft 1 is connected with a vibration shaft 11 through a spline to transmit the rotary motion, and enough displacement for axial vibration of the vibration shaft 11 is reserved on the spline. In addition, the vibration shaft 11 and the static cylindrical excitation cam 4 generate relative rotation motion in the rotation process, and generate axial sinusoidal vibration under the action of the cylindrical excitation cam 4; in the vibration process, the vibration shaft 11 compresses the butterfly spring 5 when moving downwards under the action of the cylindrical excitation cam 4, the butterfly spring 5 stores elastic potential energy in a compressed state, when the vibration shaft 11 moves to the maximum amplitude, the elastic potential energy stored in the butterfly spring 5 is the maximum, and the vibration shaft 11 starts to move upwards under the action of restoring force provided by the butterfly spring 5, so that the vibration shaft is circulated to form axial vibration.
The low-frequency vibrator capable of adjusting amplitude through spiral feeding is provided by the embodiment, the upper end of an input shaft 1 can be matched with a main shaft of a machining center to output rotary motion, a vibration shaft 11 is connected with the input shaft 1 through a spline to allow the vibration shaft 11 to perform axial motion while performing rotary motion, a cylindrical excitation cam 4 is matched with an annular sine arc-shaped groove of the vibration shaft 11 to output axial sine vibration through relative motion matching, the lower end of the vibration shaft 11 is connected with a clamping tool through threads, low-frequency vibration auxiliary drilling machining is achieved, the upper end face of the vibration shaft 11 is extruded through spiral feeding of an amplitude-adjusting screw 9, the vibration shaft 11 moves downwards under feeding extrusion of the amplitude-adjusting screw 9 to change the matching gap between the cylindrical excitation cam 4 and the annular sine excitation arc-shaped groove, the action stroke of the cylindrical excitation cam 4 is adjusted, and amplitude adjustment is achieved. In addition, the introduction of the amplitude modulation screw 9 improves the simplicity and convenience of amplitude modulation of the low-frequency vibrator, and the processing efficiency and the processing quality of drilling processing.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (7)
1. A screw-feed amplitude modulated low frequency vibrator, comprising: the vibration damper comprises a shell (12) with a hole shoulder in the middle, a connecting screw (2), an input shaft (1), a deep groove ball bearing (3), a cylindrical excitation cam (4), a butterfly spring (5), a lower baffle plate (6), an amplitude modulation screw (9), a positioning sleeve (10), a vibration shaft (11) and a sliding bearing (13), wherein the input shaft is arranged in the shell (12);
the lower end of the input shaft (1) is connected with the upper end of the vibration shaft (11) through spline structures on respective end faces, central shafts are overlapped, internal threads are arranged in a central shaft hole of the input shaft (1), so that an amplitude-modulated screw (9) penetrates through the central shaft hole through threaded fit and then abuts against the central position of the upper end face of the vibration shaft (11), and a cutter is mounted at the lower end of the vibration shaft (11);
an annular shaft shoulder is formed between the driving rotating part at the upper section of the input shaft (1) and the transmission rotating part at the lower section of the input shaft (1), and the deep groove ball bearing (3) is arranged between the shaft shoulder of the input shaft (1) and the shell (12); an annular convex shoulder is arranged between the vibration part connected with the upper section of the vibration shaft (11) and the vibration recovery part connected with the lower section of the vibration shaft, an annular sine arc-shaped groove is formed in the upper end face of the annular convex shoulder, the cylindrical excitation cam (4) is installed on the hole shoulder of the shell (12) and is positioned on the annular convex shoulder of the vibration shaft (11), and a sine cam structure matched with the annular sine arc-shaped groove is formed in the lower end face of the cylindrical excitation cam; the positioning sleeve (10) is sleeved outside the transmission rotating part of the input shaft (1) and is positioned between the deep groove ball bearing (3) and the cylindrical excitation cam (4);
the butterfly spring (5) is arranged in an annular cavity formed by a vibration return part at the lower section of the vibration shaft (11) and the shell (12), and a lower baffle (6) fixedly arranged at the bottom end of the shell (12) through a connecting screw (2) is used for limiting the axial position of the butterfly spring (5); the sliding bearing (13) is sleeved outside the vibration recovery part of the vibration shaft (11) and is positioned at the bottom of the butterfly spring (5), and the sliding bearing (13) is fixedly connected with the lower baffle plate (6) through a connecting screw (2);
the low-frequency vibrator with the amplitude adjusted through spiral feeding is used for providing rotary motion through an input shaft (1) in matched connection with a main shaft, enabling the vibration shaft (11) to axially move while performing the rotary motion through a spline connection structure between the input shaft (1) and the vibration shaft (11), and providing restoring force for the vibration shaft (11) in a vibration process through a butterfly spring (5), so that output axial sinusoidal vibration is used through matching of a cylindrical excitation cam (4) and a sinusoidal vibration structure of an annular shoulder in the vibration shaft (11), and a cutter mounted at the lower end of the vibration shaft (11) is driven to perform drilling machining through the axial sinusoidal vibration; and the device is also used for changing the fit clearance between the cylindrical excitation cam (4) and the annular sine arc-shaped groove in the vibration shaft (11) through the spiral feeding motion of the amplitude modulation screw (9) in the input shaft (1), thereby adjusting the amplitude of the low-frequency vibrator.
2. The screw-feed amplitude adjusted low frequency vibrator according to claim 1,
the bottom end of a transmission rotating part in the input shaft (1) is provided with a circular groove, the end face of the circular groove is provided with a spline groove, the upper end face of the vibration shaft (11) is provided with a spline shaft, the spline shaft of the vibration shaft (11) is embedded into the circular groove and forms a spline structure with the spline groove, so that the input shaft (1) and the vibration shaft (11) transmit the rotating motion of the input shaft (1) through the spline connection structure, and the vibration shaft (11) rotates and moves axially;
the middle part of the upper end face of the vibration shaft (11) is provided with a circular groove, so that the lower end of the amplitude-modulated screw (9) directly abuts against the circular groove, and the center of the lower end is provided with an internal thread hole for installing a cutter.
3. The screw-feed amplitude adjusted low frequency vibrator according to claim 2,
the upper end face of the annular convex shoulder of the vibration shaft (11) is provided with an annular sine arc-shaped groove, and the lower end face of the cylindrical excitation cam (4) is provided with N periodic sine cam structures for vibrating in a matched mode through the sine cam structures and the annular sine arc-shaped groove.
4. The low-frequency vibrator with the spiral feeding amplitude adjusted according to any one of claims 1 to 3, characterized in that an inner ring of the deep groove ball bearing (3) is in interference fit with the input shaft (1), and an outer ring is in interference fit with the inner wall of the shell (12);
the cylindrical excitation cam (4) is in interference fit with the inner wall of the shell (12) and is used for limiting the cylindrical excitation cam (4) to rotate;
the positioning sleeve (10) is in interference fit with the inner wall of the shell (12) and is used for axially positioning the cylindrical excitation cam (4).
5. The screw-feed amplitude modulated low frequency vibrator according to any one of claims 1 to 3, further comprising: an upper bearing end cap (8);
the upper bearing end cover (8) is fixedly connected to the top end of the shell (12) through a connecting screw (2) and used for protecting the inner cavity environment of the deep groove ball bearing (3) and the shell (12).
6. The screw-feed amplitude modulated low frequency vibrator according to any one of claims 1 to 3, further comprising: a lower bearing end cap (7);
the lower bearing end cover (7) is fixedly connected to the bottom end of the lower baffle (6) through a connecting screw (2) and used for protecting the inner cavity environment of the sliding bearing (13) and the shell (12).
7. The screw-feed amplitude modulated low frequency vibrator according to any one of claims 1 to 3, wherein said butterfly spring (5) comprises 8 to 12 butterfly springs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120076258.5U CN215545161U (en) | 2021-01-12 | 2021-01-12 | Low-frequency vibrator capable of adjusting amplitude through spiral feeding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120076258.5U CN215545161U (en) | 2021-01-12 | 2021-01-12 | Low-frequency vibrator capable of adjusting amplitude through spiral feeding |
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| Publication Number | Publication Date |
|---|---|
| CN215545161U true CN215545161U (en) | 2022-01-18 |
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|---|---|---|---|
| CN202120076258.5U Active CN215545161U (en) | 2021-01-12 | 2021-01-12 | Low-frequency vibrator capable of adjusting amplitude through spiral feeding |
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| Country | Link |
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| CN (1) | CN215545161U (en) |
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