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JP2016225961

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DESCRIPTION JP2016225961
Abstract: The present invention provides a configuration of a bolt-clamped Langevin type
ultrasonic transducer for exciting ultrasonic vibration mainly composed of longitudinal vibration
to a tool, and a tool used therefor. A steel front mass 4 is provided at its front end with a collet
hole into which the collet 11 is inserted, and at its rear end is provided with a female screw
portion 31 for coupling with a steel bolt 13 and a female screw from the rear end of the collet
hole A first tool storage hole 29a penetrating the portion 31 is provided. The bolt 13 is provided
with a second tool storage hole 29 b which is a through hole for making the central axes of the
bolts 13 identical. The front mass 4, the piezoelectric element 2a, the electrode plate 3a, the
piezoelectric element 2b, the electrode plate 3b, and the rear mass 6 made of steel are arranged
in this order, tightened by the internal thread portion 31 of the front mass 4 and the bolt 13 and
integrated in a vibrating manner. The type ultrasonic transducer 1 is assembled, the collet 11 is
put into the collet hole of the front mass 4, the tool 32 is inserted into the collet 11, and the tool
32 is mounted by tightening the collet nut 12. [Selected figure] Figure 1
Bolt-clamped Langevin ultrasonic transducer and tool used for it
[0001]
The present invention relates to a bolt-clamped Langevin type ultrasonic transducer and a tool
used therefor, and relates to a configuration capable of exciting a vibration mainly composed of
longitudinal vibration in a tool attached to the tip of the bolt-clamped Langevin type ultrasonic
transducer.
[0002]
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1
Devices using a piezoelectric element as a power source are used in various applications.
Piezoelectric elements are classified into single crystals, thin films, and ceramics. Piezoelectric
ceramics are widely used because of their freedom in shape and cost. However, piezoelectric
ceramics have mechanical properties such as excellent compressive strength but poor tensile
strength. For this reason, a bolt-clamped Langevin type ultrasonic transducer is widely used
which compensates for the lack of tensile strength by sandwiching a piezoelectric ceramic with a
metal block and tightening it with a bolt to apply a pressing force, thereby enabling high output.
Also, although lead zirconate titanate based piezoelectric ceramics are currently used in the
mainstream, lead-free piezoelectric ceramics not containing lead have also begun to be used as
environmental measures. The lead-free piezoelectric ceramic is described in detail in Non-Patent
Document 1.
[0003]
Unexamined-Japanese-Patent No. 2004-193306
[0004]
Japan AEM Society, "Lead-free Piezoelectric Ceramic Device", Kiyokendo, September 2008, p31p87
[0005]
In the configuration of the bolt-clamped Langevin type ultrasonic transducer of the conventional
configuration, the ultrasonic vibration of the tool attached to the tip of the bolt-clamped Langevin
type ultrasonic transducer does not make the longitudinal vibration into the vibration mode of
the main component.
[0006]
The present invention has been invented in view of the above-mentioned conventional problems,
and the object of the present invention is to provide a bolt-clamped Langevin type ultrasonic
transducer for exciting ultrasonic vibration whose main component is longitudinal vibration in a
tool. It is an object to provide a configuration of a tool.
[0007]
The present invention is to provide a tool storage hole penetrating the front mass of a bolt-
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2
clamped Langevin ultrasonic transducer.
[0008]
According to the present invention, the configuration of the bolt-clamped Langevin type
ultrasonic transducer is provided in the front mass and the flange portion of the tool storage hole
along the center axis of the collet hole length for storing the collet.
[0009]
The present invention also provides a tool storage hole in an external thread unit integrated with
or connected to the front mass of a bolt-clamped Langevin ultrasonic transducer.
[0010]
The present invention also provides a tool storage hole in a bolt for joining a front mass, a flange
portion, a piezoelectric element, an electrode plate and a rear mass in a bolt-clamped Langevin
type ultrasonic transducer.
[0011]
The present invention is also a bolt-clamped Langevin type ultrasonic transducer in which a tool
storage hole is provided in an external thread portion for joining a rear mass.
[0012]
Another object of the present invention is to provide a tool storage hole in a rod having an
external thread portion for tightening a piezoelectric element and an electrode plate, in a
configuration of a bolt-clamped Langevin type ultrasonic transducer.
[0013]
The present invention is also a bolted Langevin type ultrasonic transducer for holding a tool by
shrink fitting, having a tool storage hole along a central axis passing through the front mass for
storing the tool in the front mass.
[0014]
In the present invention, the diameter of the tool used for the bolted Langevin type ultrasonic
transducer is 0.2 times or more and 0.8 times or less at the extension of the tool with respect to
the diameter of the shank of the tool. .
04-05-2019
3
[0015]
The present invention is also a tool for use in a bolt-clamped Langevin type ultrasonic transducer
in which the length of the extension portion is 0.5 times or less of the total tool length.
[0016]
By means of the bolt-clamped Langevin type ultrasonic transducer of the present invention and
the tool used therefor, it is possible to excite the vibration mainly composed of longitudinal
vibration in the tool attached to the tip.
[0017]
It is a sectional view showing a bolting Langevin type ultrasonic transducer of the present
invention.
It is a figure explaining the length of a tool, and the relationship between the longitudinal
vibration and lateral vibration of a tool.
It is sectional drawing which shows the ultrasonic spindle which used the bolt-clamped Langevin
type ultrasonic transducer of this invention.
It is a figure explaining the ultrasonic processing machine using the ultrasonic spindle shown in
FIG.
It is sectional drawing which shows the structure which hold | maintains a tool by heat caulking
of the bolt-fastening Langevin type ultrasonic transducer of this invention.
It is sectional drawing which shows another bolting Langevin type ultrasonic transducer of this
invention.
It is sectional drawing which shows another bolt-clamping Langevin type ultrasonic transducer of
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4
this invention.
It is a figure explaining the composition of the tool of the present invention.
[0018]
Hereinafter, a bolted Langevin type ultrasonic transducer for attaching a tool according to the
present invention to a tip end will be described with reference to FIG.
[0019]
As described in Patent Document 1, since the piezoelectric ceramic has mechanical properties
such as excellent compressive strength but poor tensile strength, the piezoelectric ceramic is
sandwiched between metal blocks and clamped with a bolt to apply pressure. A bolt-clamped
Langevin-type ultrasonic transducer that compensates for the lack of tensile strength by giving it
and enables high output is widely used.
[0020]
The bolt-clamped Langevin ultrasonic transducer of the present invention actually produced will
be described with reference to FIG.
First, the front mass 4 will be described.
The front mass 4 made of steel has a collet hole at its tip for receiving the collet 11.
Then, at the rear end portion of the front mass 4, a female screw portion 31 for coupling with the
steel bolt 13 is provided.
Then, a first tool storage hole 29a which penetrates the female screw portion 31 from the rear
end of the collet hole is provided.
Further, a flange portion 15 is provided at the rear end of the front mass 4.
04-05-2019
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[0021]
The bolt 13 is provided with a second tool storage hole 29 b which is a through hole for making
the central axes of the bolts 13 identical.
Then, the bolted Langevin ultrasonic transducer 1 is assembled.
The front mass 4, the piezoelectric element 2a, the electrode plate 3a, the piezoelectric element
2b, the electrode plate 3b, and the rear mass 6 made of steel are arranged in this order and
tightened by the internal thread portion 31 of the front mass 4 and the bolt 13 A Langevin type
ultrasonic transducer 1 is configured.
The piezoelectric element 2 is a lead zirconate titanate piezoelectric ceramic.
Recently, lead-free lead-free piezoelectric ceramics have also been developed and can be used.
The electrode plate 3 is made of phosphor bronze.
[0022]
The collet 11 is put into the collet hole of the front mass 4 of the assembled bolted Langevin type
ultrasonic transducer 1, the tool 32 is inserted into the collet 11, and the tool 32 is mounted by
tightening the collet nut 12.
[0023]
Here, the reason for providing the tool storage holes 29a and 29b which are through holes in the
front mass 4 and the bolt 13 will be described.
First, it was found that lateral vibration can be suppressed in ultrasonic vibration of the tool 32
by increasing the overall length of the tool 32. The result measured about this is shown in FIG.
The magnitude of longitudinal vibration and lateral vibration was measured using a bolt-clamped
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Langevin ultrasonic transducer. FIG. 2A shows the measurement results of a stainless steel rod
having a diameter of 3 mm and a length of about 30.6 mm, and FIG. 2B shows the measurement
results of a stainless steel rod having a diameter of 3 mm and a length of about 70 mm.
[0024]
The stainless steel rod having a diameter of 3 mm and a length of about 30.6 mm has a lateral
vibration greater than that of the longitudinal vibration at an advance amount of 8 mm. Here, the
advance amount indicates the length of extension of the tool from the collet. The stainless steel
rod 3 mm in diameter and about 70 mm in length had a maximum longitudinal vibration of about
140 μmp-p, and the stainless steel rod 3 mm in diameter and about 30.6 mm in length had a
maximum vertical vibration of about 20 μmp-p . It is considered that this is because the
resonance frequency of the stainless steel rod and the resonance frequency of the Langevin type
ultrasonic transducer are closer at about 70 mm in length than in about 30.6 mm in length. .
When the length of the tool is close to that of the Langevin-type ultrasonic transducer, the
longitudinal vibration of the tool becomes large and the lateral vibration becomes relatively
small.
[0025]
Therefore, the front mass 4 and the bolt 13 are provided with tool storage holes 29a and 29b
which are through holes, and the tool 32 can be passed through the tool storage holes 29a and
29b. Tools can be used. Thus, by increasing the overall length of the tool, it is possible to
suppress the lateral vibration in the ultrasonic vibration of the tool 32.
[0026]
Also, as the advance amount from the collet 11 is smaller, the rotational shake at the time of
rotation of the tool is smaller. Even if the total length of the tool 32 is large, the advance amount
of the tool to be drawn out from the tip of the collet 11 can be reduced, so that the rotational
movement of the tool 32 can be reduced.
[0027]
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Next, a configuration for attaching the bolted Langevin type ultrasonic transducer 1 of the
present invention to an ultrasonic spindle is shown in FIG. The ultrasonic spindle can rotate the
bolt-clamped Langevin type ultrasonic transducer 1 to which the tool 32 is attached, for example,
at a high speed of over 10,000 rotations per minute. The flange portion 5 having the step of the
bolted Langevin ultrasonic transducer 1 is brought into contact with the front surface of the case
9. Further, the case plate 8 is provided with a hole at the center and is tightened with a nut 16
from the rear. As a result, a tensile stress is applied to the bolt 13 and a compressive force is
applied to the case 9 to support it. The tool storage hole 29 b of the bolt 13 is provided to the
rear beyond the rear mass 6. Here, symbols indicating the bolts 13 and the screws of the front
mass 4 are omitted in order to make the drawing complicated.
[0028]
Since a compressive force is applied between the flange portion 5 and the case 9, the frictional
force between the flange portion 5 and the case 9 is increased, so the holding force between the
case 9 and the bolt-clamped Langevin type ultrasonic transducer 1 is high. Become. For example,
even when torque is externally applied, the yield strength is increased.
[0029]
The ultrasonic spindle 33 is attached to the XYZ processing device 24 to make an ultrasonic
processing machine shown in FIG. This ultrasonic processing machine can improve the
processing quality of difficult-to-process materials etc. and shorten the processing time.
[0030]
Next, another embodiment of the present invention will be described with reference to FIG. The
front mass 4 and the flange portion 5 are integrally made, and a female screw portion 31 is
provided at the rear portion. Then, the front mass 4 is provided with a thermal caulking hole for
holding the tool 32 by thermal caulking. The heat caulking holes pass through the front mass 4
and the flange portion 5. Then, an inner screw 34 having an external thread 30 is screwed into
the front mass, and the central axis is hollow, and the piezoelectric element 2a, the electrode
plate 3a, the piezoelectric element 2b, and the electrode plate 3b are arranged in this order. The
screw is tightened by means of a female screw provided in, and a bolted Langevin type ultrasonic
04-05-2019
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transducer 1 is produced.
[0031]
Thus, the present invention is also applicable to a bolted Langevin type ultrasonic transducer 1 in
which a tool is mounted by shrink fitting.
[0032]
Next, still another embodiment of the present invention will be described with reference to FIG.
The steel front mass 4 and the flange 5 are integrally made. The front mass 4 is provided at its
tip with a collet hole into which the collet 11 is inserted. A steel male screw 30 is provided at the
rear end of the front mass 4. That is, the front mass 4 has a bolt-like configuration with the head
and the male screw 30 as the screw.
[0033]
Then, a tool storage hole 29 is provided in the male screw portion 30. Since the flange 5 is
integrally formed with the front mass 4, the rear end of the tool 32 comes to the rear of the
position of the flange 5 by inserting the tool into the tool storage hole 29 in the male screw 30.
When the tool is inserted to the rear of the flange portion, since the vicinity of the flange portion
becomes a node of the longitudinal vibration, a node of the longitudinal vibration is generated in
the tool 32, and the longitudinal vibration can be strongly excited. And excitation of transverse
vibration can be suppressed.
[0034]
Although the front mass, the flange portion and the male screw portion are integrally formed, the
vibration can be integrated by separately preparing and assembling each of them. Although it
may be advantageous to make the front mass, the flange portion and the bolt separately, it is
difficult to match the central axes of the respective members.
04-05-2019
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[0035]
Next, still another embodiment of the present invention will be described with reference to FIG.
The steel front mass 4 and the flange 5 are integrally made. The front mass 4 is provided at its
tip with a collet hole into which the collet 11 is inserted. Then, at the rear end of the front mass
4, a female internal thread portion 31 made of steel is provided. The front mass 4 is provided
with a first tool storage hole 29 penetrating therethrough.
[0036]
On the other hand, a male screw 30 is provided at the front end of the rear mass 6, and a tool
storage hole 29 reaching the rear mass 6 is provided at the center. Of course, the rear mass 6
may be a through hole.
[0037]
Then, the electrode plates 3a and 3b are tightened with the piezoelectric elements 2a and 2b by
the internal thread portion 31 of the front mass 4 and the external thread portion 30 of the rear
mass 6, and a bolted Langevin ultrasonic transducer 1 is produced.
[0038]
Next, still another embodiment of the present invention will be described with reference to FIG.
For example, as shown in FIG. 5, the male screw portion 30 needs to apply a large tension to the
male screw portion 30 in order to vibrationally integrate the piezoelectric elements 2a and 2b,
the electrode plates 3a and 3b and the rear mass 6. Therefore, it is preferable that the area
orthogonal to the central axis of the male screw 30 be large.
[0039]
Therefore, by reducing the diameter Ed of the extension of the tool 32, the reduction of the area
of the surface orthogonal to the central axis of the male thread is reduced. However, if the
04-05-2019
10
diameter Ed of the extension of the tool is made too small, the vibration of the tool excluding the
extension becomes large and the effect of the extension becomes small. Therefore, the diameter
Sd of the shank for holding the tool is 0.2 or more. Also, in order to reduce a reduction in the
area of the surface orthogonal to the central axis of the male screw portion of the male screw
portion, the diameter of the extension portion is made 0.8 times or less that of the shank.
[0040]
Also, in order to adjust the advance length of the tool, the shank length needs to be the usual
shank length. For this reason, although the total length Lt of the tool becomes long, the extension
Lh is made equal to or less than 0.5 times the total tool length Lt. Therefore, the total length of
the tool is longer than that of a normal tool.
[0041]
The bolt-clamped Langevin ultrasonic transducer according to the present invention can be
suitably used for a wide range of objects, and includes an ultrasonic drilling apparatus, an
ultrasonic welding apparatus, an ultrasonic cleaner, an ultrasonic abrasive processing apparatus,
and an ultrasonic wave. It can be used for a cutter device etc. In addition, it can be used
particularly for applications where a large characteristic of the longitudinal vibration component
is to be obtained in a bolt-clamped Langevin type ultrasonic transducer.
[0042]
Reference Signs List 1 bolt tightening Langevin type ultrasonic transducer 2 piezoelectric
element 3 electrode plate 4 front mass 5 flange portion 6 rear mass 7 shaft 8 case plate 9 case
10 stainless steel rod 11 collet 12 collet nut 13 bolt 14 drive wiring 15 earth wiring 16 nut 17
bearing 18 bearing case 19 rotary rotary transformer 20 fixed rotary transformer 21 support 22
fixed mounting plate 23 ultrasonic oscillation circuit 24 ultrasonic processing device 25 work 26
nozzle 27 motor 28 collet hole 29 tool storage hole 30 male screw portion 31 female screw
portion 32 Tool 33 Ultrasonic spindle 34 Screw
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