JPS63288601A - Ultrasonic vibration cutting device - Google Patents

Abstract

PURPOSE:To firmly fix a flexible vibrator, by providing an annular structure, which has stop screws fitted to a recess formed in vibration node parts of the flexible vibrator, in its periphery and giving tightening force to the annular structure by a tightening member. CONSTITUTION:Voltage is applied to an electrode plate, and when its driving frequency is adjusted to the resonance frequency driving a flexible vibrator 20, a tool 35 vibrates in a direction at a right angle with the axis. And the flexible vibrator 20, being fixed by stop screws 43, 46 with a hexagonal hole in positions of vibrative node parts N2, N3 and firmly held by a ring 40 and a sleeve 45 with uniform force from the peripheral side surface, is fixed by a housing 59. In this way, the flexible vibrator 20, being fixed to the housing 59 with strong force of point contact, prevents the vibrative configuration from being given a bad influence with less loss for the vibration, further the vibrator can be held by high rigidity for cutting force.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to lathes, shapers, and
Regarding ultrasonic vibration cutting equipment used in planing machines etc.
Particularly related to devices for fixing flexural oscillators - Conventional technology Conventionally, ultrasonic vibrations have been used in cutting devices. The cutting tool is used to process the workpiece by ultrasonic vibration in the tangential direction, and it is known that this produces significant vibration cutting effects such as significantly reducing cutting resistance and improving processing accuracy.

As for the ultrasonic vibration cutting device as described above.

A patent application has been filed by the present applicant as "Japanese Patent Application No. 62-24047". Therefore, this device will be explained based on FIGS. 7 to 10.

First, the flexible vibrator 1 has two annular electrostrictive elements 4 and 5 which are sandwiched between metal members 2 and 3 from both sides at the large diameter part and polarized in the thickness direction, with their electrodes 6 facing each other. ,
An annular insulating plate 9 is inserted into the inner periphery of the zero-order and front electromotive strain elements 4 and 5, which are provided via two electrode plates 7 and 8, and is connected to the electrostrictive element 5. A common electrode plate 10 is provided between the metal members 3. Furthermore, a screw hole 12 into which a bolt 11 is screwed is formed at one end of the deflection vibrator 1, and a cutting tool 13 is provided at the tip of the output end at the other end.

Such a flexural oscillator 1 has vibration node parts N, ,N
, when fixing in the conical recess 14 formed at
Bolt 1 with a pointed end screwed into the screw hole 17 formed in 6
8 can be fixed by strongly pressing it against this conical recess 14 from four locations on both sides.

The problem that the invention aims to solve However, in the case of the fixing method as described above.

Since the strength of the side surface 16 of the holder 15 in the lateral direction (fixing direction parallel to the bottom surface 19) is weak, there is a limit to the tightening strength of the pointed bolt 18, and sufficient fixation cannot be achieved.

Furthermore, if the mounting position and shape of the cutting tool 13 are not symmetrical with respect to the fixing direction of the flexible vibrator 1 and are inclined, the center of gravity of the tip of the cutting tool will shift and the vibration will move in the vertical direction (see Figure 7). It often happens that the device does not vibrate but vibrates obliquely in the circumferential direction.

Furthermore, since the electrostrictive elements 4 and 5 drive the flexible vibrators with high voltage, insulation is required.

Means for Solving the Problems In order to solve these problems, an annular body having a set screw that fits into a recess formed at a vibration node portion of the flexural oscillator is installed in the flexural oscillator. A housing was provided on the outer periphery of the annular body, surrounding the outer periphery of the annular body, and applying a tightening force to the annular body by means of a fastening body.

Effect: Therefore, uniform force is applied to all the setscrews provided on the annular body, so the flexure vibrator is fixed even more strongly, and
Since this deflection vibrator is integrally held together with the annular body, it is rotatable in the circumferential direction, and the vibration direction of the cutting tool can be adjusted to always match the cutting direction.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1 to 6. First, the flexible oscillator 20 has two annular electrostrictive elements 23 and 24 sandwiched between metal members 21 and 22 from both sides at its large diameter part and polarized in the thickness direction. ) are provided facing each other with two electrode plates 25 and 26 interposed therebetween, and an annular insulating plate (not shown) is inserted into the inner periphery of the electrostrictive element 23 and 24.

Further, the electrostrictive element 24 and the metal material 2 in the large diameter portion
A common electrode plate 27 is provided between the two, and a recess 28 is formed on the outer periphery of the large diameter portion of the common electrode plate 27, located at the vibration node portion N2°N. Furthermore, the deflection vibrator 2
A hole (not shown) for a bolt 29 is formed at one end of the zero, and a rubber bolt 29 is formed along the circumference of the large diameter end of the other end.
A groove 31 into which the ring 30 is inserted is formed, and a right-hand male thread 32 is formed on the outer periphery of the output end beyond the groove 31 .

Next, the tool holder 33 has a left male screw thread 34 formed on the outer periphery of the large diameter section at one end, and a tool 35 at the small diameter section at the other end.
is fixed by silver brazing or the like, and a wrench hook 36 is formed on its outer periphery for adjusting the angle when tightening.

Next, the fastening ring 37 has a right female thread trough 38 and a left female thread trough 39 formed on its inner periphery in order to position and fasten the deflection vibrator 20 and the tool holder 33 in the vibration loop portion L2. A hexagonal shape is formed on the outer periphery to serve as a wrench for tightening.

Next, the ring 40 as an annular body has a ring shape with a diameter sufficient to surround the outer periphery of the flexible vibrator 20, and a lead wire for energizing the electrode plates 25 and 26 is attached to the inner periphery of the ring 40. A groove 42 is formed through which the groove 41 passes, and a screw hole 44 is formed on the periphery of the groove 42 to be fitted with a hexagon socket set screw 43 located at the vibration node portion N□.

Next, the sleeve 45 as an annular body is attached to the ring 40.
It has a cylindrical shape with a diameter large enough to surround the outer periphery of the ring, and on its periphery there is a screw hole 47 into which a hexagon socket set screw 4G is screwed, located at the vibration node portion N2°N, and the ring. A hole 48 is formed in which 40 hexagon socket set screws 43 can be adjusted. Further, an annular insulating material 49 is inserted into the inner periphery of the sleeve 45 to protect the electrostrictive elements 23 and 24 that generate a high voltage, and a female thread valley 50 is formed on the inner periphery of this end. ing.

Next, the cap 51 has a male thread 52 formed on its outer periphery, and is screwed into the female thread trough 50 of the sleeve 45 . Also in its center.

A through hole 53 into which the cable 41 is inserted and a protrusion 55 in which a male thread 54 is formed are provided, and an O-ring 56 is inserted into the protrusion 55 to form a female thread trough 57.
The cap nut 58 forming the cap nut 58 is screwed and tightened.

Next, the housing 59 has a rectangular parallelepiped appearance with a cylindrical cavity 60 inside, a split groove 61 is formed on the top surface, and a tool rest and a table (not shown) are formed on the bottom surface on the opposite side. A collar 64 is provided in which a six 63 for a bolt 62 is formed for fixing the bolt 62 to the bolt 62. Further, on the thick upper side surface on the side where the split groove 61 is formed, a hexagon socket head 66 is formed into which a hexagon socket head bolt 65 as a fastening body can be inserted and a female thread valley is formed in the inner part. .

Incidentally, instead of the collar 64, a tail 67 may be provided on the side surface of the housing and fixed to a dovetail groove of a tool rest or table (not shown) so as to be movable in the vertical direction.

In such a configuration, when the deflection vibrator 20 is driven by applying reverse phase voltages having opposite phases to the electrode plates 25 and 26 from a drive power source (not shown) and adjusting the drive frequency to the resonance frequency, the cutting tool 35 vibrates in a direction perpendicular to the axis (perpendicular to the plane of the paper in FIG. 1).

Then, this deflection oscillator 2o is connected to a vibration node portion N,
, At the N position, tighten the hexagon socket set screw 43 (N, position I).
The deflection vibrator 2
0 is strongly fixed at each point by the housing 59, so that its vibration state is not adversely affected, loss due to vibration is small, and it can be held with high rigidity against cutting force.

Additionally, an O ring 30 is attached to the side surface of the large diameter end of the deflection vibrator 20.
Since airtightness can be maintained by inserting the , it is possible to prevent the cutting fluid supplied to the cutting tool 35 during cutting from leaking into the electrostrictive elements 23 and 24.

Effects of the Invention In the present invention, an annular body having a set screw that fits into a recess formed at a vibration node portion of the flexural oscillator is provided on the outer periphery of the flexural oscillator.

Since a bousing is provided surrounding the outer periphery of this annular body to apply a tightening force to the annular body using a fastening body, a uniform force is applied to all the setscrews provided on the annular body, making the flexural oscillator stronger. Fixed.

In addition, since the flexible oscillator is integrally held together with the annular body and is rotatable in the circumferential direction, even if the cutting tool is installed at an angle with respect to the fixing direction of the flexible oscillator, the center of gravity of the cutting tool may shift. Even if the tool vibrates obliquely in the circumferential direction, the vibration direction of the cutting tool can always be adjusted to match the cutting direction, and the loss due to the vibration is small, while maintaining high rigidity against cutting force. It can be done.

[Brief explanation of drawings]

FIG. 1 is a horizontal sectional view showing an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the annular body and its attached parts, and FIG. 3 is a perspective view of the flexible vibrator shown in FIG. 1. 4 is a perspective view of the housing including the fastening body shown in FIG. 1, FIG. 5 is a partially cutaway front view of the housing, and FIG. 7 is a side view with a part cut away showing a conventional example of a flexible vibrator, FIG. 8 is a perspective view showing the same including its holder, FIG. 9 is a perspective view of the electrostrictive element shown in FIG. 7, and FIG. The figure is a perspective view of the electrode plate of FIG. 7. 20... Flexural oscillator, 40... Ring (annular body)
. 43...Hexagon socket set screw (set screw), 45...
・Sleeve (annular body), 46...Hexagon socket set screw (set screw), 59...Housing, 65...Hexagon socket head bolt (fastening body) Applicant: Taga Electric Co., Ltd. Agent Akira Aiki゛1°゛''
11'''?・, L11 Procedures Minister 1 Seian (Voluntary) September 4, 1986

Claims (1)

[Claims] An annular body having a set screw that fits into a recess formed at a vibration node portion of the flexural oscillator is provided on the outer periphery of the flexural oscillator. An ultrasonic vibration cutting device characterized by having a housing that applies a tightening force to the body.