JPH0575546B2 - - 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 has been known that high-efficiency machining can be achieved by applying low-frequency vibrations and ultrasonic vibrations to tools.

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 grinding and cutting, high-efficiency 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, when this device is attached to a machine or is configured as a handheld device, it is subject to undesirable vibrations, making it difficult to precisely cut, grind, or cut a workpiece, especially in the case of a handheld device.

Therefore, the present invention includes: a tool, a vibrator, an ultrasonic vibrating section including a horn having a vibration node and amplifying the vibration of the vibrator and transmitting it to the tool; a motor; an ultrasonic vibrating section and a motor A cylindrical cam supported by a cam bearing is positioned between the cylindrical cam and the cylindrical cam, and a first follower part and a second follower part are arranged on both sides of the cylindrical cam,
The other end of the first follower section is coupled to a vibration node of the ultrasonic vibrating section, the other end of the second follower section is coupled to a portion of the motor other than the motor shaft, and the first follower section and the second follower section are connected to each other. A pin provided at one end of each of the two follower parts is connected to a cam groove of the cylindrical cam so that the two follower parts reciprocate in opposite directions, and a motor shaft of the motor is connected to the cam shaft at one end of the cylindrical cam. a cam device in which a cam bearing of the cam device is fixed and a first follower part and a second follower part are slidably inserted; A tool vibration machining device in which the mass of the first follower part plus the mass of the second follower part plus the part on the motor side coupled to the camshaft on one end side of the cylindrical cam is approximately the same. This is to eliminate the above problem.

In the figure, 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. 4 indicates the vibration node of the horn 2. The ultrasonic vibrating section consists of the above-mentioned tool, horn, and vibrator.

5 is a motor, and 6 is a motor shaft.

Reference numeral 7 indicates a cylindrical cam positioned between the ultrasonic vibrating section and the motor 5 so as to be coaxial with the axes of both. The cylindrical cam 7 has an endless cam groove 8
cam shafts 9 and 1 protruding from both ends of the cam 7.
0 are supported by cam bearings 11 and 12, respectively. The cam bearings 11 and 12 have a radial bearing portion and a thrust bearing portion. The camshaft 10 is the motor 5
The connecting portion 13 is connected to the motor shaft 6 of
For example, the motor shaft 6 may be a spline joint, and the motor shaft 6 transmits rotation to the camshaft 10, but must be connected to the camshaft 10 so as to be able to slide thereon. Cam groove 8
serves as a guide and connects the pin 15 of the first cylindrical follower section 14 with the pin 15 (so as to relieve the inertial force of the first follower section 14 and the second follower section 16) of approximately 180 degrees.
Pin 1 of the second cylindrical follower portion 16 with a degree phase shift
Lead 7. When the cam 7 is rotated, the first and second follower portions 14,
16 is reciprocated. The first follower section 14 is connected to the follower section 4 of the horn 2. Second follower part 1
6 is coupled to a portion of the motor 5 other than the motor shaft 6.

Note that both follower portions 1 approach each other due to the rotation of the cam 7.
In order to prevent pins 4 and 16 from coming into contact with each other, gaps 1 and 1, respectively, are made larger than the gap 1 between pin 15 and pin 17, respectively.

26 indicates an elongated cylindrical casing. It is necessary that the casing 26 fixes the bearings 11 and 12 and allows the first follower part 14 and the second follower part 16 to be slidably inserted therein. As in this example, the follower parts 14, 16
When the slits 18 and 19 are cylindrical, opposing slits 18 and 19 are provided in the middle part of the follower part 14, and the slits 18 and 19
As shown in FIG. 2, rib-shaped protrusions 20 and 21 protruding from the outer periphery of the bearing 11 are inserted to make the follower part 14 slidable, and a slit 22, which also faces the intermediate part of the follower part 16, is inserted. 23 and slit 2
2 and 23, as shown in FIG.
0, 21, 24, and 25 may be fixed to the inner peripheral surface of the casing 26.

The mass of the ultrasonic vibrating section plus the first follower section 14 is approximately the same as the mass of the second follower section 16 plus the coupling section 13 and motor 5.

The tool vibration machining device uses an ultrasonic vibrating section and a motor 5 connected to an ultrasonic vibration oscillator 29 and a motor control device 30 via conductive wires 27 and 28, respectively.

When the ultrasonic vibrator is driven by the oscillator 29, an ultrasonic signal is generated by the mechanical vibration of the vibrator 3 and the amplitude expansion of the horn 2. When the motor 5 is driven by the motor control device 30, the rotational motion of the motor 5 is converted into linear motion by the cam device, producing low frequency vibrations. Therefore, when the ultrasonic vibrator and the motor 5 are driven, low frequency vibration is added to the ultrasonic vibration, and a superimposed vibration of the ultrasonic vibration and low frequency vibration is applied to the tool 1, causing the oscillator 29 to operate. When the tool 1 is stopped, only low frequency vibrations are applied to the tool 1.

When the motor 5 is driven, the rotation of the cam 7 and the first
The vibration is advanced by the movement of the follower section 14 of
The second follower part 16, which is out of phase with the first follower part 14, is coupled to the motor 5, and the camshaft 10 is slidably coupled to the motor shaft 6, so that the ultrasonic vibration part The system of the first follower and the second follower and the motor are interlocked in opposite directions, so that the respective masses of both systems move in opposite directions,
The inertial force is effectively canceled out. Therefore, the impact caused by vibrations on the casing can be sufficiently alleviated.

Furthermore, since a motor is used, the low frequency vibration frequency can be easily changed by changing the motor rotation speed.

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

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a state in which the first follower part and the second follower part of the device of the present invention are farthest apart from each other;
2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is a sectional view taken along the - line in FIG. 1... Tool, 2... Horn, 3... Vibrator, 4
... Vibration node, 5 ... Motor, 6 ... Motor shaft, 7
... Cylindrical cam, 8 ... Cam groove, 9, 10 ... Cam shaft, 11, 12 ... Cam bearing, 13 ... Connection part,
14...First follower part, 15...Pin of the first follower part, 16...Second follower part, 17...Pin of the second follower part, 18, 19...Pin of the second follower part 1 slit in the follower part, 20, 21...rib-like projection of the first follower part, 22, 23...slit in the second follower part, 2
4, 25... Rib-shaped projection of second follower part, 26...
…casing.

Claims (1)

[Scope of Claims] 1. A tool, a vibrator, and an ultrasonic vibrating section consisting of a horn having vibration nodes and magnifying the vibration of the vibrator and transmitting it to the tool; A motor; An ultrasonic vibrating section and a motor A cylindrical cam supported by a cam bearing is positioned between them, and a first follower part and a second follower part are arranged on both sides of the cylindrical cam,
The other end of the first follower section is coupled to a vibration node of the ultrasonic vibrating section, the other end of the second follower section is coupled to a portion of the motor other than the motor shaft, and the first follower section and the second follower section are connected to each other. A pin provided at one end of each of the two follower parts is connected to a cam groove of the cylindrical cam so that the two follower parts reciprocate in opposite directions, and a motor shaft of the motor is connected to the cam shaft at one end of the cylindrical cam. a cam device in which a cam bearing of the cam device is fixed and a first follower part and a second follower part are slidably inserted; A tool vibration machining device in which the mass of the first follower part plus the mass of the second follower part plus a part on the motor side coupled to the camshaft on one end side of the cylindrical cam is approximately the same.