JPH0430956A - Ultrasonic vibrational polishing device - Google Patents

Abstract

PURPOSE:To enable the polishing of the inner peripheral face in a small diameter simply and highly accurately, by generating ultrasonic vibration in the circumferential direction by an exciting means and making a polishing means provided at the tip of a bar body subjected to a high frequency vibration in the circumferential direction after amplifying the vibration by an amplifier. CONSTITUTION:The title device is equipped with an exciting mean 2 which generates untrasonic vibration in the circumferential direction by electifying the alternating current in the specific frequency, an amplifying body 3 which amplifies the ultrasonic vibration transmitted from the exciting means 2, having the shape that one end is fixed to the exciting means 2 and the other end is tapered toward the tip side as well, flange 1 which fixes the vibration node of this amplifying body 3 and also stores the exciting mean 2 at the internal part and a polishing mean 5 provided at the part of the vibration flat of the bar body fixed to the tip of the amplifying body 3. Namely the polishing mean 5 is vibrated with the ultrasonic vibration being transmitted to the polishing mean 5 of the bar body tip after its amplifying by the amplifying body 3. Consequently polishing can be performed easily and with high accuracy at even the specially back part, etc., of the hole inner peripheral face.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ultrasonic vibration polishing apparatus that polishes a member to be polished using ultrasonic vibration.

[Conventional technology]

41F devices, tools, etc. that can perform predetermined cutting and polishing on workpieces having various shapes have been developed and used.

For example, an ultrasonic vibration polishing device as shown in FIG. 5 is known as a means for machining the inner surface of a small-diameter, deep hole. That is, this ultrasonic vibration polishing apparatus includes a vibration excitation means 100 that generates ultrasonic vibration using a piezoelectric element or the like, a rod 101 that vibrates in the longitudinal direction by transmitting the ultrasonic vibration generated by the vibration excitation means +00. A polishing body 102 such as a grindstone is fixed to the tip of this rod 101, and the grip body 103 on the base end side is held by hand, and the inner surface of the workpiece is polished while vibrating the polishing body 102. It is designed to let you do so.

[Problem to be solved]

By the way, in the ultrasonic vibration polishing device having such a configuration, the polishing body is vibrated along the longitudinal direction of the rod to polish the inner surface of the hole, etc. in the direction of its center line. In the case of a round hole, it is troublesome to polish the entire inner peripheral surface of the hole. In other words, this is because it is necessary to perform operations such as polishing the portion corresponding to a specific central angle several times each time. In addition, with a configuration that polishes in the direction of the center line of the hole, it is possible to polish a flat surface with relatively high precision, such as the inner surface of a square hole, but it is difficult to polish the inner surface of a round hole with high precision. It is extremely unsuitable for polishing, etc.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional drawbacks, it is an object of the present invention to provide an ultrasonic vibration polishing device suitable for polishing the inner peripheral surface of a round hole, particularly precision polishing of a small diameter and deep inner peripheral surface. It is something.

[Means to solve the problem]

That is, the present invention is an ultrasonic vibration polishing apparatus that polishes a member to be polished by ultrasonic vibration, and which generates ultrasonic vibration in the circumferential direction by applying an alternating current of a predetermined frequency. an amplifier whose one end is fixed to the vibration excitation means and whose other end is tapered toward the distal end, and which amplifies the ultrasonic vibrations from the vibration excitation means; It is provided with a flange to which the node portion is fixed and which houses the vibration excitation means inside, and a polishing means provided at the vibration antinode of the rod fixed to the tip of the amplifier.

[Effect]

The ultrasonic vibration polishing device of the present invention generates ultrasonic vibrations in the circumferential direction by a vibrator, amplifies the ultrasonic vibrations by an amplifier, and then transmits the ultrasonic vibrations to the polishing means at the tip of the rod for polishing. By vibrating the means, it is possible to easily and accurately polish the inner circumferential surface of the hole, especially in the deep part.

Furthermore, in the ultrasonic vibration polishing apparatus of the present invention, the polishing means is provided at the maximum displacement (amplitude) portion exactly corresponding to the vibration antinode of the rod, so that polishing can be performed efficiently.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an ultrasonic vibration polishing apparatus according to the present invention. It is composed of.

The flange 1 has a cylindrical shape with an open end face on the -blade side, and constitutes a grip portion for an operator to grip during operation.

The vibration excitation means 2 generates vibrations at a frequency (n) in the same range as ultrasonic waves in order to perform high-precision polishing and to prevent surrounding people such as workers from being bothered by noise during work. In this embodiment, ultrasonic vibration is generated by electromagnetic force. That is, as shown in FIG. 2, the vibration generating means 2 of this embodiment is composed of a coil formed by winding copper wire or the like around a magnetic material such as ferrite having a substantially cylindrical shape. A high-frequency alternating current with a frequency f (-n) equivalent to the ultrasonic range is applied to the current.

The amplifier 3 amplifies the high-frequency vibration (n) generated by the vibration excitation means 2 and transmits it to the tip of the rod 4, and has a shape that narrows toward the tip surface, and The end face is fixed to the vibration excitation means 2.

Further, this amplifying body 3 is fixed to the flange 1 at the vibration node portion Δ, and the vibration generating means 2 is housed inside the flange 1 via this amplifying body 3.

The rod 4 is made of a material that easily transmits vibrations and has a predetermined length. More specifically, the rod 4 has a predetermined length β from the vibration node A of the amplifier 3 so that the tip portion B becomes the vibration antinode. It is formed to the dimensions of. That is, the rod 4 of this embodiment is
As shown in Figure 3, the length from A to B! is 1/4 wavelength (
λ), and its length β is determined by the following equation.

f=v/(4n) "However, ■ is the moving speed of the ultrasonic wave] -n is the frequency of vibration of the vibration excitation means 2" The polishing means 5 is made of a material such as a grindstone with high abrasiveness, As shown in FIG. 4, a substantially cylindrical piece with a curved surface 5a of a predetermined curvature formed on one side is used to perform high-precision polishing on the inner circumferential surface 7a of the hole 7 of the workpiece 6. When used, vibration antinode part B of the tip of rod 4
is fixed to.

〔effect〕

As explained above, according to the ultrasonic vibration polishing apparatus according to the present invention, ultrasonic vibration is generated in the circumferential direction by the vibration excitation means, and after this vibration is amplified by the amplifier, the vibration is applied to the tip of the rod. Since the provided polishing means is vibrated at high frequency in the circumferential direction, effects such as polishing of the inner circumferential surface at the innermost part of the small diameter can be easily performed with high precision.

Moreover, according to the ultrasonic vibration polishing device according to the present invention,
The polishing means is provided at the maximum displacement (amplitude) portion of the rod-shaped tip, so that polishing can be performed extremely efficiently.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an ultrasonic vibration polishing apparatus according to the present invention, FIG. 2 is a perspective view of essential parts showing vibration excitation means, etc. according to the invention, and FIG. 3 is an ultrasonic vibration polishing apparatus according to the invention. FIG. 4 is a schematic sectional view showing the operation of the ultrasonic vibration polishing device according to the present invention, and FIG. 5 is a plan view showing the conventional vibration polishing device. 6... Member to be polished, 2... Oscillating means, 3... Amplifying body, 1... Flange, 4... Rod body, 5... Polishing means.

Claims (1)

[Scope of Claims] 1. An ultrasonic vibration polishing device that polishes a workpiece by ultrasonic vibration, comprising: an excitation device that generates ultrasonic vibrations in the circumferential direction by passing an alternating current of a predetermined frequency; an amplifying body having one end fixed to the vibrating means and the other end narrowing toward the distal end side and amplifying ultrasonic vibrations from the vibrating means; It is characterized by comprising a flange which fixes the vibration node portion and accommodates the vibration excitation means inside, and a polishing means provided at the vibration antinode of the rod fixed to the tip of the amplifier. Ultrasonic vibration polishing equipment.