JPH07313938A - Langevin-type transducer to be bolted - Google Patents

Abstract

PURPOSE:To provide a block-shaped Langevin-type transducer to be bolted for which centering and processing by a machine tool can be done easily and which needs no secondary processing after that. CONSTITUTION:Regarding a Langevin-type transducer to be bolted which is composed of a rear mass 1A made of a metal and having a female screw part in the center, a positive and a negative electrode plates 3a, 3b, and circular piezoelectric ceramics 4a, 4b and is united by a screw rod 5 which is a front mass 2A made of a metal and having a female screw part in the center and male screw parts in both ends, at least a part of one of the front mass and the rear mass is made to be a regular hexagonal prism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolted Langevin type vibrator, and more particularly to the shapes of a front mass and a rear mass which are blocks for sandwiching a piezoelectric element.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a bolted Langevin type vibrator has a ring-shaped negative ring between a ring-shaped rear mass 1 and a front mass 2 having a female screw portion at its center. Electrode plate 3a, annular piezoelectric ceramics 4b,
An annular positive electrode plate 3b and an annular piezoelectric ceramic 4a are sequentially stacked. further,
A stud bolt 5 having effective screw portions at both ends penetrates the hexagon nut 6, the rear mass 1, the piezoelectric ceramics 4a, 4b and the electrode plates 3a, 3b, and is further screwed into the female screw portion of the front mass 2. There is. Then, in this state, by further tightening the hexagon nut 6 via the stud bolt 5, the rear mass 1, the electrode plates 3a, 3b,
The piezoelectric ceramics 4a and 4b and the front mass 2 are integrated (configuration 1). In addition, as shown in FIG. 6, between the square pole-shaped rear mass 7 and the square pole-shaped front mass 8 having a female screw portion in the center thereof, a ring-shaped negative electrode plate 3a, Annular piezoelectric ceramic 4b, annular positive electrode plate 3b, and annular piezoelectric ceramic 4
It has a configuration in which a is sequentially superposed. Further, the stud bolt 5 having effective thread portions at both ends is provided with the rear mass 7, the piezoelectric ceramics 4a, 4b and the electrode plates 3a, 3b.
Through, and is further screwed into the female thread portion of the front mass 8. Then, in this state, the rear mass 7 is further tightened via the stud bolts 5, so that the rear mass 7, the electrode plates 3a and 3b, and the piezoelectric ceramic 4 are
a, 4b and the front mass 8 are integrated (configuration 2).

[0003]

However, in the case of the above configuration 1 (FIG. 5), it is necessary to form the cutting surface 21 for tightening the screw on the side surface of the front mass and the rear mass. Also,
Normally, the centering of a machine tool is performed by a 3-jaw chuck, but in the case of the above configuration 2 (FIG. 6), there is a problem in mechanical equipment such as the need for special dedicated machine equipment such as a 4-jaw chuck. . In addition, as compared with the 3-jaw chuck, the 4-jaw chuck is more likely to shift the chuck, and it is difficult to center the block machining machine tool. Since the contact angle of the cutting tool when using a machine tool is larger than that of a circle, the processing speed had to be slowed to prevent the cutting tool from being broken or chipped. Therefore, the work efficiency was unavoidable.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a block-shaped bolted Langevin type vibrator having a block shape such as a front mass or a rear mass that is easy to center and machine a machine tool and does not require subsequent secondary machining. To do.

[0005]

As a technical means for achieving the above-mentioned object, the present invention has a rear mass made of metal and having a female thread portion in the central portion, and a female thread portion in the central portion. Positive and negative ring-shaped electrode plates and two ring-shaped piezoelectric elements are alternately stacked between the front mass made of metal, and screw parts are formed at both ends. In the bolted Langevin type oscillator in which the rear mass, the electrode plate, the piezoelectric ceramics, and the front mass are integrated by means of a screw rod, at least one part of the front mass or the rear mass has a regular hexagonal prism shape.

[0006]

Since the shape of the front mass and the shape of the rear mass are partly formed in the shape of a regular hexagon, there is already a flat surface for tightening, so there is no need for secondary processing (processing such as a cutting surface). The centering stroke of the block machining machine tool can also be performed by the commonly used 3-jaw chuck. Also, since the contact angle of the cutting tool is a regular hexagonal shape that is relatively close to a circular shape, the angle can be small, and it can be done without lowering the processing speed during cutting (By the way, the cutting angle of the cutting tool in the cylindrical shape is Since the resistance is close to 0 ° without limit, the resistance is low and the machining speed can be increased, while the cutting angle of the cutting tool in the square pole shape has a maximum resistance of about 45 °, and the machining speed must be slowed down. Therefore, the normal angle of the cutting tool in the regular hexagonal column shape of the present invention is about 30 ° at the maximum, and the resistance is relatively low, so the processing speed will not be reduced.)

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view of a bolted Langevin type vibrator showing a first embodiment of the present invention. The same parts as in the prior art are given the same numbers.
The bolted Langevin type oscillator has a regular hexagonal columnar rear mass 1A and a female screw portion 21a at the center thereof.
The tip portion 21A has a regular hexagonal prism shape and the other end portion 22
A ring-shaped negative electrode plate 3a, a ring-shaped piezoelectric ceramics 4b, a ring-shaped positive electrode plate 3b, and a ring-shaped piezoelectric ceramics 4a are provided between the front mass 2A and the front mass 2A, which are formed in a conical shape toward A. It has a structure in which they are stacked in order. Further, the stud bolt 5 having effective screw portions at both ends is provided with the rear mass 1A and the piezoelectric ceramics 4a and 4b.
It also has a structure in which it penetrates the electrode plates 3a and 3b and is further screwed into the female thread portion of the front mass 2A. Then, in this state, by further tightening the rear mass 1A via the stud bolts 5, the rear mass 1A, the electrode plate 3
a, 3b, piezoelectric ceramics 4a, 4b, and front mass 2A are integrated.

Next, a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 2 is a perspective view of a bolted Langevin type vibrator showing a second embodiment of the present invention. The same parts as those in the first embodiment of the present invention are designated by the same reference numerals. The bolted Langevin transducer
A ring-shaped negative electrode plate 3a, a ring-shaped piezoelectric ceramics 4b, which has a ring-shaped rear mass 1A of a regular hexagonal column and a female screw portion 21b at the center thereof, and an annular front mass 2B of a regular hexagonal column, An annular positive electrode plate 3b and an annular piezoelectric ceramic 4a are sequentially stacked. Further, the stud bolt 5 having effective screw portions at both ends penetrates the rear mass 1A, the piezoelectric ceramics 4a, 4b and the electrode plates 3a, 3b, and is further screwed into the female screw portion of the front mass 2B. Then, in this state, by further tightening the rear mass 1A via the stud bolt 5, the rear mass 1A and the electrode plates 3a, 3
b, piezoelectric ceramics 4a, 4b and front mass 2B
Are integrated.

Next, a third embodiment of the present invention will be described in detail with reference to the drawings. FIG. 3 is a perspective view of a bolted Langevin type vibrator showing a third embodiment of the present invention. The same parts as those in the first embodiment and the conventional embodiment of the present invention are designated by the same reference numerals. The bolted Langevin type vibrator has a ring-shaped rear mass 1 and a female screw portion 21a in the center thereof, and a tip portion 21A has a regular hexagonal prism shape, and is formed in a conical shape from the middle toward the other end 22A. The negative electrode plate 3a having an annular shape, the piezoelectric ceramic 4b having an annular shape, the positive electrode plate 3b having an annular shape, and the piezoelectric ceramic 4a having an annular shape are sequentially stacked between the front mass 2A and the front mass 2A. . Further, the stud bolt 5 having effective screw portions at both ends is provided with the hexagon nut 6, the rear mass 1, the piezoelectric ceramics 4a and 4b and the electrode plate 3.
The structure is such that it penetrates through a and 3b and is further screwed into the female thread portion of the front mass 2A. Then, in this state, the hexagon nut 6 is further tightened via the stud bolt 5 to integrate the rear mass 1, the electrode plates 3a and 3b, the piezoelectric ceramics 4a and 4b, and the front mass 2A.

Next, a fourth embodiment of the present invention will be described in detail with reference to the drawings. FIG. 4 is a perspective view of a bolted Langevin type vibrator showing a fourth embodiment of the present invention. The same parts as those in the embodiment of the present invention are designated by the same reference numerals. The bolted Langevin-type vibrator includes a ring-shaped negative electrode plate 3a and a ring-shaped piezoelectric plate 3a between a ring-shaped rear mass 1A of a regular hexagonal column and a ring-shaped front mass 2 having a female screw portion at its center. The ceramics 4b, the ring-shaped positive electrode plate 3b, and the ring-shaped piezoelectric ceramic 4a are laminated in this order. Further, the stud bolt 5 having effective threaded portions at both ends is provided with the rear mass 1
A, piezoelectric ceramics 4a, 4b and electrode plates 3a, 3b
Through, and is screwed into the female thread portion of the front mass 2. Then, in this state, the rear mass 1A is further tightened via the stud bolt 5 to integrate the rear mass 1A, the electrode plates 3a and 3b, the piezoelectric ceramics 4a and 4b, and the front mass 2.

It should be noted that, unlike the first, second, third and fourth embodiments, most of the block shapes do not have to be regular hexagonal shapes, and a configuration in which a regular hexagonal shape is included in a part of a cylinder is used. It may be.

[0012]

According to the present invention, since the front mass and the rear mass are partially formed in the shape of a regular hexagon, there is already a flat surface for tightening, so that there is no need for secondary processing. Also, the centering stroke of the machine tool can be easily performed because it is a regular hexagonal shape that is relatively circular. Therefore, it is possible to provide a block-tightened Langevin type vibrator having a block shape such as a front mass or a rear mass, which can be easily manufactured and processed, and which can simplify the manufacturing process and the processing.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a second embodiment of the present invention.

FIG. 3 is a perspective view showing a third embodiment of the present invention.

FIG. 4 is a perspective view showing a fourth embodiment of the present invention.

FIG. 5 is a perspective view showing a conventional example.

FIG. 6 is a perspective view showing another conventional example.

[Explanation of symbols]

 1, 1A, 7 ... Rear mass 2, 2A, 2B, 8 ... Front mass 3a, 3b ... Electrode plate 4a, 4b ... Piezoelectric ceramic 5 ... Stat bolt 6 ... Hexagon nut

Claims (1)

[Claims] 1. A positive and negative annular ring between a rear mass made of metal and having a female thread portion at the center and a front mass made of metal and having a female thread portion at the center. The rear plate, the electrode plate, the piezoelectric ceramics, and the front mass are integrated by screw rods in which electrode plates and two annular piezoelectric elements are alternately stacked and threaded portions are formed at both ends. A bolted Langevin-type oscillator, characterized in that at least one of the front mass and the rear mass is formed into a regular hexagonal prism shape.