JPS6044257A - Vibrative tool machining device - Google Patents

Abstract

PURPOSE:To suppress vibration of a device so as to perform high accurate machining, by setting the first and the second springs, which force a holding member mounted to the vibrative node of an ultrasonic vibrating part to be pressed to the side of a low frequency vibrating part and the low frequency vibrating part to be pressed to the side of the holding member, further providing the third spring between the both vibrating parts. CONSTITUTION:An ultrasonic vibrating part comprises an electrostrictive vibrator 3 connected to a horn 2 fixed to a tool 1. A low frequency vibrating part, comprising a holding member 5 connecting one end of a plunger 6, the plunger 6, bobbin 7, winding 8, stator 9, screw 10 and a plate 11, is slidably inserted into an outer cylinder 12. The ultrasonic and low frequency vibrating parts, if they are driven by oscillating machines 19, 20 respectively, apply vibration overlapping the ultrasonic and low frequency vibrations to the tool 1 to perform high efficient machining, but the low frequency vibration relaxes a shock due to vibration to the outer cylinder 12 by moving the respective mass of the ultrasonic and low frequency vibrating parts in an opposite direction so as to cancel inertia force by the cooperative action of the second and the third springs 17, 18 with the first spring 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for machining a workpiece by applying vibration to a tool.

Conventionally, in the field of cutting and grinding workpieces, cutting is performed by applying superimposed vibrations of low frequency vibration and ultrasonic vibration to the tool.
It is known that grinding allows highly efficient machining.

The reason why such highly efficient machining is possible is that firstly, the addition of ultrasonic vibration reduces the back force compared to conventional cutting, and secondly, the addition of low frequency vibration reduces the principal force. This is because the cutting force is significantly reduced by superimposed vibration machining. Because of this, in addition to cutting and grinding, highly efficient processing can also be performed in the field of cutting.

A feature of processing equipment that uses such low-frequency vibrations is that shocks are generated by the vibrations. Therefore, if this device is mounted on a machine or configured as a hand-held type, it will suffer from undesirable vibrations, and especially in the case of a hand-held type, it will be difficult to precisely cut or cut the workpiece (d). It was far away.

Accordingly, one aspect of the present invention is to attach a holding member to a vibration node of an ultrasonic vibrating part that is equipped with a vibrator, a horn, and a tool, and to this holding member, at least a plunger that forms a low-frequency vibration part together with a coinot is attached. and a low-frequency vibration section are slidably inserted into an outer cylinder, and a first spring that presses the holding member toward the low-frequency vibration section side and a first spring that suppresses the low-frequency vibration section toward the holding section side are attached to the outer cylinder. 2 springs are provided, and a third spring is provided between the holding member and the low-frequency vibration section, and a third spring is provided between the holding member and the low-frequency vibration section.
The above-mentioned problem is solved by using a spring.

In this case, the first spring and the second spring should have almost the same spring constant, and the mass of the ultrasonic vibrating part, the holding member plus the plunger, and the mass of the low-frequency vibrating part excluding the grannya should be almost the same. is advantageous.

Next, the present invention will be explained with reference to the drawings.

Reference numeral 1 indicates a tool consisting of a grindstone, and a horn 2 is fixed to this tool 1 by a suitable method such as a screw or a taper, and an electrostrictive vibrator 3 is coupled to the horn 2.

The ultrasonic vibrating section consists of the above tools, a horn, and a vibrator force.

Reference numeral 5 denotes a cylindrical holding member with a bottom, which is attached to the vibration node 4 of the horn 2.

Reference numeral 6 indicates a granger made of pure iron, one end of which is connected to the bottom of the holding member 5. The plunger 6 and the Bohin 72 winding 8 form a direct acting) 1/noid coil.

A stator 9 made of pure iron faces the other end of the plunger 6 inserted into the bobbin 7, and the stator 9 is held by a screw 10 so that it can move forward and backward, and the screw 0 is attached to the bobbin 7. It is held by a plate 11. The low frequency vibrating section consists of the above-mentioned plunger, bobbin, winding, stator, jig, and plate.

Reference numeral 12 designates an outer cylinder, into which the aforementioned holding part 5 and the low-frequency vibration part 2 are slidably inserted. The aforementioned screw 10
A lid plate 15 having a screwdriver insertion hole 4 is combined.

Reference numeral 16 denotes a first spring, which is disposed between the protrusion 13 and the holding member 5, and is in contact with both. Reference numeral 17 indicates a second spring, which is disposed between the cover plate 5 and the plate 110, and is in contact with both. Both springs have substantially the same spring constant, and the mass of the ultrasonic vibrating section, the holding member plus the granger, and the mass of the low frequency vibrating section excluding the plunger are substantially the same.

18 indicates a third spring, which is connected to the holding portion end 25 and the bobbin 7.
It is placed between and in contact with both. 3. As mentioned above, when a stator that moves forward and backward with a screw is attached to the low frequency vibrating section, the movement of the plunger can be adjusted.

The above-mentioned tool vibration machining device connects the ultrasonic vibrating section and the low frequency vibrating section to the ultrasonic oscillator 19. It is used by connecting to the low frequency oscillator 20.

The ultrasonic vibration part and the low frequency vibration part are each oscillators 19.2
0, ultrasonic vibration is generated by the mechanical vibration of the vibrator 3 and the amplitude expansion of the horn 2, and the low frequency vibration of the low frequency vibrating part is added to this, causing the tool l to generate ultrasonic vibration and low frequency vibration. If the superimposed vibration is detected and the operation of the first oscillator 19 is stopped, only low-frequency vibrations are applied to the tool I.

When low frequency vibration is applied, an intermittent current of several Hz to several 100 Hz flows from the first oscillator 20 to the coil, and the vibration is advanced by the repulsion of the plunger 6 and recovery by the suppression of the first spring 1G. The presence of the third spring 17, 18 and cooperation with the first spring j6 causes the system of the ultrasonic vibrating part, the holding member, and the plunger, and the system of the low-frequency vibrating part excluding the plunger to move in opposite directions. As a result, each mass of the two systems moves in opposite directions, and the inertial force is canceled out.1. The Rukoto. therefore,
This means that the impact caused by vibrations on the outer cylinder can be sufficiently alleviated.

In the above explanation, it is assumed that a whetstone is used as a tool, but it is also possible to use a saw blade, file, knife, scraper blade, etc.
For this reason, it is possible to process many materials such as metal, wood, plastic, stone, and rubber.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view of the device of the present invention. 1... Tool, 2... Horn, 3... Vibrator, 4... Vibration node, 5... Holding member, 6... Plunger, 7...
- Bobbin, 8...Winding, 12...Outer tube, 16...First spring, 17...Second spring, 18...Third spring. Patent applicant Pylon!・Mannen Pen Co., Ltd. and 1 other person 920 Continuation of page 1 0 Author Atsushi Takizawa Hiratsuka Calligraphy Yawata 1-cho Hiratsuka Factory

Claims (1)

[Claims] ■ A holding member is attached to a vibration node of an ultrasonic vibrating unit including a vibrator, a horn, and a tool, a grunger that forms a low-frequency vibrating unit together with at least a coil is attached to this holding member, and the holding member and The low frequency vibration part is slidably inserted into the outer cylinder. The outer cylinder includes a first spring that presses the holding member toward the low-frequency vibration section, and a second spring that presses the low-frequency vibration section toward the holding member.
Install the spring. The tool vibration machining device further includes a third spring disposed between the holding member and the low-frequency vibrating portion and in contact with both. 2 Connect the first and second springs! The tool vibration machining according to claim 1, wherein the spring constant is the same, and the mass of the ultrasonic vibrating part and the holding member plus the plunger is approximately the same as the mass of the low frequency vibrating part excluding the plunger. Device.