JPH0565310B2 - - Google Patents

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, it is known that highly efficient machining can be achieved by applying superimposed vibrations of low frequency vibration and ultrasonic vibration to a tool.

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 the addition of low-frequency vibration reduces the principal force. This is because the cutting force is significantly reduced by superimposed vibration machining. Therefore, in addition to cutting and grinding, highly efficient processing can 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, when this device is installed in a machine or configured as a handheld device, it is subjected to undesirable vibrations, making it difficult to accurately cut, grind, or cut a workpiece, especially in the case of a handheld device.

Therefore, in the present invention, a holding member is attached to a vibration node of an ultrasonic vibrating part including a vibrator, a horn, and a tool, a plunger that forms a low-frequency vibrating part together with at least a coil is attached to this holding member, and the holding member and A low frequency vibrating section is slidably inserted into an outer cylinder, and a first spring that presses the holding member toward the low frequency vibrating section and a second spring that presses the low frequency vibrating section toward the holding member are installed in the outer tube. In addition, a third spring is disposed between the holding member and the low-frequency vibrating portion so as to be in contact with both, thereby eliminating the above-mentioned problem.

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 plunger should be almost the same. is advantageous.

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

1 indicates a tool consisting of a grindstone, and a horn 2 is fixed to this tool 1 by an appropriate method such as a screw or a taper.
An electrostrictive vibrator 3 is coupled to the horn 2. The ultrasonic vibrating section consists of the above-mentioned tool, horn, and vibrator.

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

6 indicates a plunger made of pure iron, one end of which is connected to the bottom of the holding member 5. The plunger 6 forms a direct-acting solenoid coil with a bobbin 7 and a winding 8. A pure iron stator 9 faces the other end of the plunger 6 inserted into the bobbin 7,
The stator 9 is held by a screw 10 and can move forward and backward, and the screw 10 is held by a plate 11 attached to the bobbin 7. The low frequency vibration section consists of the above plunger, bobbin, winding, stator, screw, and plate.

Reference numeral 12 designates an outer cylinder, into which the aforementioned holding member 5 and the aforementioned low frequency vibrating section are slidably inserted, and this outer cylinder 12 is provided with an annular inward protrusion 13 at one end, and has the aforementioned screw 10 at the other end. A lid plate 15 having a screwdriver insertion hole 14 for the purpose is combined.

Reference numeral 16 indicates a first spring, which is disposed between the protrusion 13 and the holding member 5, and is in contact with both. 17 indicates the second spring, and the cover plate 1
5 and plate 11, and is in contact with both. Both springs have substantially the same spring constant, and the mass of the ultrasonic vibrating portion, the holding member, and the plunger, and the mass of the low frequency vibrating portion excluding the plunger are approximately the same.

Reference numeral 18 indicates a third spring, which is disposed between the holding member 5 and the bobbin 7 and is in contact with both.

As described above, when a stator that moves forward and backward with a screw is attached to the low frequency vibrating section, the amount of movement of the plunger can be adjusted.

The tool vibration machining apparatus uses an ultrasonic vibrating section and a low frequency vibrating section connected to an ultrasonic oscillator 19 and a low frequency oscillator 20 via conducting wires 21 and 22, respectively.

When the ultrasonic vibrating section and the low frequency vibrating section are driven by the oscillators 19 and 20, respectively, ultrasonic vibration is generated due to the mechanical vibration of the vibrator 3 and the expansion of the vibration of the horn 2. When the vibration is applied, a superimposed vibration of ultrasonic vibration and low frequency vibration is given to the tool 1, and when the operation of the oscillator 19 is stopped, the tool 1
Only low-frequency vibrations are applied to the

When low frequency vibration is applied, an intermittent current of several Hz to several 100 Hz flows from the oscillator 20 to the coil,
The vibration is advanced by the repulsion of the plunger 6 and the return by the pressure of the first spring 16, but the presence of the second and third springs 17 and 18 and cooperation with the first spring 16 allows the ultrasonic vibrating part to be held. The system of the member and the plunger and the system of the low frequency vibrating part excluding the plunger move in opposite directions, and the respective masses of both systems move in opposite directions, canceling out the inertial force. Therefore, the impact caused by vibrations on the outer cylinder can be sufficiently alleviated.

In the above explanation, a grindstone is used as the tool, but it is also possible to use a saw blade, file, knife, scraper blade, etc., and thus it is possible to process many materials such as metal, wood, plastic, stone, and rubber. It happens.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view of the device of the present invention. DESCRIPTION OF SYMBOLS 1... Tool, 2... Horn, 3... Vibrator, 4... Vibration node, 5... Holding member, 6... Plunger, 7... Bobbin, 8... Winding wire, 12... Outer cylinder, 16... First spring, 17... First 2nd spring, 18...3rd spring.

Claims (1)

[Claims] 1. A holding member is attached to a vibration node of an ultrasonic vibrating section including a vibrator, a horn, and a tool, and a plunger that forms a low-frequency vibrating section together with at least a coil is attached to this holding member. A low frequency vibrating section is slidably inserted into an outer cylinder, and a first spring that presses the holding member toward the low frequency vibrating section and a second spring that presses the low frequency vibrating section toward the holding member are installed in the outer tube. A tool vibration machining device comprising: a holding member and a low frequency vibrating portion; and a third spring which is in contact with both the holding member and the low frequency vibrating portion. 2. A patent claim in which the first spring and the second spring have substantially 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 plunger are substantially the same. The tool vibration machining device according to item 1.