JPS61164774A - Vibration polishing machine - Google Patents

Abstract

PURPOSE:To carry out polishing with high accuracy and favorably in a short time by providing a means of vibrating a polishing plate at a high vibrating frequency with a small amplitude and making the tracks of movement of abrasive grains with respect to a workpiece during a unit time complex and longer. CONSTITUTION:The switch of an ultrasonic vibration generating device 24 is turned on, to make a vibrator 18 torsionally vibrate around an axis X with a minute amplitude, via a cord 40, a slip ring 20, etc. This torsional vibration is transmitted to a polishing plate 28 through a vibration transmitting horn 26, equally to make the end of the polishing plate 28 torsionally vibrate around the axis X with a minute amplitude of few microns. After rotating a rotary body 4 by driving a motor 14 under this condition, a plate glass (workpiece) 32 is pressed with a holder 34 and a supporting means 38 to be pushed against the polishing plate being torsionally vibrated, while feeding a polishing agent to the polishing plate 28 from a feeding pipe 26, to polish this plate glass 32 with the abrasive grains on the polishing plate 28 under ultrasonic vibration.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a polishing device for optical elements such as camera lenses having flat or spherical surfaces, and in particular polishing while vibrating a polishing plate at high frequency in the same direction as the rotation direction. The present invention relates to a vibration polishing device that performs processing.

[Conventional technology]

In general, the processing accuracy of the surface of lenses for optical devices such as cameras is one of the important factors that determines the quality of the product. As is well known, the device for polishing the surface of this lens is of the type that presses the object to be polished while supplying an abrasive agent containing abrasive grains to a rotating polishing plate. is used. Recently, in order to further increase the polishing speed, a device has been put into practical use that performs vibratory grindstone processing by applying low frequency vibrations of about 10 Hz in the rotating direction of the polishing plate using means such as a solenoid valve. ~do.

[Problem that the invention seeks to solve]

However, with the conventional vibration polishing apparatus, it is difficult to obtain a good polished surface because the machined surface of the object to be polished does not follow the polishing plate due to the influence of surface runout of the polishing plate, and it is also difficult to obtain a good polished surface. In order to vibrate the rotating body including the heavy polishing plate,
There were problems such as the life of the rotating body bearing being significantly shortened.

〔the purpose〕

An object of the present invention is to provide a device that does not have the problems of the conventional devices.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a polishing apparatus that presses an object to be polished and a polishing plate and rotates the polishing plate to process the object. It is characterized by being provided with means for causing high frequency vibration.

〔Example〕

Embodiments of the vibration polishing apparatus according to the present invention will be described in detail below with reference to the drawings.

FIG. 0 is a cross-sectional view showing an embodiment of a vibration polishing apparatus according to the present invention, and this figure particularly shows an embodiment of the apparatus for polishing the surface of flat glass. As shown in the figure, the vibration polishing apparatus 2 includes a rotating body 4 having a cylindrical shape, and a main body 8 that rotatably supports the rotating body 4 around an axis X by a bearing 6. Further, a first belt pulley 10 is protruded from the lower end of the rotating body 4, and a belt 12 is hung on the first belt pulley 10. It is also hung on a second belt pulley 16 that is fixedly installed. In this manner, the rotating body 4 can be rotated by the power of the motor 14. Inside the rotating body 4 is an ultrasonic transducer 18 having a cylindrical shape (for example, a vibration frequency of 10 to 50 k).
& ), a vibration transmission horn 26 and a polishing plate 28 are arranged. The vibrator 18 is firmly connected to a vibration transmission horn 26 using screws or the like, and the vibration transmission horn 26 is firmly connected to a polishing plate 28 using screws or the like. A flange 30 is formed on the outer surface of the vibration transmission horn 26, and the vibration transmission horn 26 is attached to the rotating body 4 at the flange 30 portion. These vibrator 1B, vibration transmission horn 26, and polishing plate 28 form one vibration system, and when the vibrator 18 vibrates at its natural frequency, the entire system becomes resonant, and at this time, the surface of the polishing plate vibrates. It is set to be the belly of the person. On the polishing plate 28, a flat glass 32 held by a holder 34 is pressed against the polishing plate 28 from above by a supporting means 38 so that the flat glass 32 can rotate. 36 is a polishing side supply pipe.

Here, a method of transmitting an electric signal generated by the ultrasonic vibration generator 24 to the vibrator 18 will be explained based on FIG.

FIG. 0 is an enlarged view of part A in FIG.

As shown in the figure, the electric signal generated by the ultrasonic vibration generator 24 passes through a cord 40 provided on the main body 8 side.
The main body 80 is guided to two ring-shaped slip rings 20 provided on the inner circumference facing the rotating body 4. The electrical signal guided to the slip ring 20 is guided to a brush 42 made of a conductor provided on the rotating body 4,
Furthermore, it is guided to the vibrator 18 by a cord 44 . In addition, as shown in Figure 1, a spring 4 is connected between the brush 42 and the rotating body 4.
6 is provided. This is provided so that when the rotary body 4 rotates, the tip of the brush 42 is always in contact with the slide and pull 20 to make electrical sliding contact.

Next, the operation of the apparatus having the above configuration will be explained.

When the switch of the ultrasonic vibration generator 24 is turned on, the electric signal generated here becomes the code 40. Pickpocket, Pulling 20.
It passes through the f run 42 and the cord 44 and enters the vibrator 18. Then, the vibrator 18 causes an electrostrictive vibration phenomenon and performs torsional vibration around the axis X with a minute amplitude. This vibration is transmitted through the vibration transmission horn 26 (connected with screws, etc.) to the polishing plate 2.
8, the tip surface of the polishing plate 28 similarly vibrates around the axis X with a very small amplitude of several microns.

Here, the switch of the motor 14 is turned on and operated to rotate the rotating body 4 equipped with the vibration system, and then the polishing side supply pipe 3
While supplying abrasive from 6 to the polishing plate 28, the flat surface is
2 is pressurized by the holder 34 and the support means 38 and pressed against the polishing plate 28. Then, the flat glass 32 rotates due to the difference in circumferential speed of the polishing plate 28, and the abrasive grains in the abrasive interposed between the flat glass 32 and the polishing plate 28 receive the ultrasonic vibrations of the polishing plate 28. Wake-up movements become more active. Note that the support means 38 may be driven to cause the flat glass 32 to reciprocate in the lateral direction. As described above, the polished surface of the flat glass 32 can be polished stably and uniformly at high speed. In the device of this embodiment, the entire vibration system is housed inside the rotating body 4, so the life of the bearing 6 of the rotating body 4 is extended. □ Again. In the above embodiment, the object to be polished was a flat surface, but the present invention can also be applied to a lens 32' having a spherical shape by using a polishing plate having a spherical surface as shown in FIG. . In that case, as shown in the figure, the lens 32'
A holder 34 for stably holding the is provided so as to be movable in the spherical direction.

〔Effect of the invention〕

As explained above in detail and concretely, in the present invention apparatus, the polishing plate vibrates with a small amplitude and at an extremely high vibration frequency, so that the object to be polished shows good followability to the polishing plate. In addition, since the locus of motion of the abrasive grains relative to the object to be polished per unit time becomes complex and long, it is possible to produce a good polished surface with high efficiency.

[Brief explanation of the drawing]

Figure 0 is a sectional view showing an embodiment of the vibration polishing apparatus according to the present invention, Figure 0 is an enlarged view of the bottom part of Figure 0, and Figure 0 is another example of the vibration polishing apparatus according to the present invention. It is a partially omitted sectional view showing an example. 2... Vibration polishing processing device, 4... Rotating body, 18...
- Vibrator, 20... Pickpocket, pulling, 24... Ultrasonic vibration generator, 26... Vibration transmission horn, 28...
- Polishing plate, 32...Flat glass. Agent Patent Attorney Jo Yamashita Figure 2 Old

Claims (3)

[Claims] (1) In a polishing device that presses an object to be polished and a polishing plate and processes the object by rotating the polishing plate, a means for vibrating the polishing plate at high frequency in the direction of rotational movement of the polishing plate is provided. A vibration polishing device characterized by comprising: (2) The vibration polishing apparatus according to claim (1), wherein the frequency of the high frequency waves generated by the high frequency vibration means is 10 to 50 kHz. (3) The vibration according to claim (1), wherein the polishing plate and the high-frequency vibrator coupled to the polishing plate constitute a vibration system, and the vibration system is housed inside a rotating body. Polishing equipment.