KR100417643B1 - Automatic Polishing Apparatus for Mold using ultrasonic waves vibrating tool - Google Patents

Abstract

The present invention relates to an automated mold finishing apparatus using ultrasonic vibration tools, comprising: an ultrasonic vibrator connected to an ultrasonic oscillator externally connected to a computer numerical control machine tool, vibration amplification means for amplifying the amplitude of the ultrasonic vibrator, and vibrations. A main shaft for rotatably fixing the ultrasonic vibration tool comprising a tool unit for grinding the workpiece to a computer numerically controlled machine tool, and first driving means connected to the main shaft for rotation in a plane parallel to the work surface of the workpiece; And a tool housing including a vibrating vibration tool in a housing including a second driving means connected to rotate in a plane along a position perpendicular to the normal of the working surface and mounted directly on a computer numerical control machine tool. Ultrasonic finishing at the cutting position This invention relates to automatic devices possibly finishing mold using ultrasonic vibration tool is.

Description

Automatic Polishing Apparatus for Mold using ultrasonic waves vibrating tool

The present invention relates to an automated mold finishing apparatus using ultrasonic vibration tools, and more particularly, directly to a computer numerical control machine tool such as CNC milling machine (CNC Milling M / C) or CNC machining center (CNC Machining center). The present invention relates to an automated mold finishing apparatus using an ultrasonic vibration tool that enables the ultrasonic finishing tool to be mounted immediately on the cutting work position.

Molds are used as a means of producing a wide range of products ranging from automobiles, electricity, electronics, precision instruments, industrial machinery, optical instruments, to office supplies, sports, leisure goods, food packaging, toys, etc. Mold technology to manufacture high quality and high performance molds is needed due to shortening of product life cycle.

Such mold technology is a very important technology that is directly related to the quality of the product, and it is no exaggeration to say that the appearance and function of the product depend on the final finishing work of the mold making. In particular, the mold finishing work refers to grinding the processed surface to the target surface roughness state when the first machining is completed. This mold finishing work is a technology that all mold makers have difficulty in the mold industry. It is a hand technology that depends entirely on the skills and senses of skilled workers, but also lacks the accumulated know-how.

In addition, it is very difficult to find skilled mold finishing technicians in Korea, and the mold finishing field, which requires manual work in a harsh environment involving dust and noise, is more difficult than other manufacturing industries where the working environment is improving as the industry develops. In fact, the situation is being avoided by new skilled workers.

1 is a schematic view showing a manual ultrasonic polishing machine for polishing using ultrasonic waves, which is one of the conventional polishing processes, the ultrasonic polishing machine 1 converts electrical energy by high frequency into mechanical energy and vibrates the workpiece surface. This polishing is to transfer a frequency of 28000 cycles per second to a transducer and to polish the surface of the workpiece by the vibration.

That is, a handpiece 2 having a diamond tip 2a formed at the end of the diamond powder sintered to have roughness of # 100 to # 1000, and a generator for supplying power to the handpiece 2. When the diamond tip 2a vibrating by the vibrator approaches the surface of the workpiece, the diamond tip 2a strikes the surface of the workpiece to polish the rough surface.

In brief, the processing principle of the ultrasonic polishing is about 16kc / sec or more sound wave is called ultrasonic wave, and the power supplied from the power supply device goes through the high frequency oscillator, and the ultrasonic oscillator generates ultrasonic vibration 16-29kc / sec, which is fixed to the tool. Transmitting through the device, the action of the cone formed at its end amplifies the amplitude of the ultrasonic vibration and supplies it to the tool.

As such, when grinding particles are supplied between the workpiece and the tool while applying ultrasonic vibration to the rod or plate-shaped tool, the grinding particles vibrate and collide with the workpiece to finely polish the surface of the workpiece, thus precisely polishing the surface of the workpiece. You can do it.

The grinding process of ultrasonic vibration tool uses impact crushing and erosion by cavitation. If you circulate the work liquid mixed with fine grains such as Al ₂ O ₃ in water with a pump, the abrasive grains will collide with the surface of the workpiece at a very high processing speed, resulting in minute cone cracking or longitudinal cracking on the surface. It is possible to obtain the effect of polishing the surface by processing. Therefore, a great effect can be obtained in the processing of hard brittle materials (materials weak to tensile strength), which is very suitable.

The erosion effect by cavitation is caused by low pressure bubbles on the surface of the workpiece due to the tool retracting at high speed, and the pressure of about 50-100 atm is generated in the case of water, and the erosion occurs. Obtained by effect.

Such an ultrasonic polishing process can be applied to precision processing of good conductors, non-conductors, semiconductors, brittle materials and hard materials by fine cutting by grinding particles, so that the application range of materials is very wide. In addition, because it is a non-rotating process, it is applied to hole digging, grooving, mold engraving and cutting, and it is possible to cut the thread through the combination of rotation and transfer, and water is mainly used as the processing liquid. There is an easy advantage.

However, such a polishing operation by the ultrasonic polishing machine 1 is possible only by the skilled technique of a skilled worker and is a hand technique that depends entirely on the sense of the skilled worker. Therefore, in the state in which the skilled worker is rapidly reduced, the finishing work by ultrasonic polishing is not only difficult to obtain skilled workers, but even skilled workers have a problem of difficulty in obtaining uniform results and low work efficiency.

The present invention has been made to solve the above problems, an object of the present invention is to directly mount and detach the ultrasonic polishing machine in a computer numerical control machine tool to enable the work to be trimmed immediately at the cutting work position. In addition, the present invention provides an automated mold finishing apparatus using ultrasonic vibration tools capable of precise surface polishing by utilizing the positional freedom provided by a computer numerical control machine tool.

1 is a schematic view showing a conventional manual ultrasonic vibration tool,

2 is a configuration diagram for explaining the configuration of the ultrasonic vibration tool,

3 is a perspective view showing a state in which a mold finishing automation apparatus using an ultrasonic vibration tool according to the present invention is mounted on a computer numerical control machine tool,

4 is a front sectional view of an automated mold finishing apparatus using ultrasonic vibration tools according to the present invention;

5 is a right sectional view of an automated mold finishing apparatus using ultrasonic vibration tools according to the present invention;

6 is a plan cross-sectional view of an automated mold finishing apparatus using ultrasonic vibration tools according to the present invention.

Explanation of symbols on the main parts of the drawings

A: Computer Numerical Control Machine Tool B: Workpiece

C: Corret Chuck 5: Ultrasonic Vibration Tool

10: first driving means 11: the main shaft

12: first connecting means 20: second connecting means

25: second driving means 30: tool housing

40 housing

In order to achieve the above object, the present invention provides an ultrasonic vibrator connected to an external ultrasonic oscillator in a computer numerical control machine tool, and vibrations formed between the ultrasonic vibrator and the tool unit to amplify the amplitude of the ultrasonic vibrator in a mold finishing automation device. And an ultrasonic vibration tool comprising an amplification means and a tool portion attached to the vibration amplification means to grind the workpiece by vibration.

The ultrasonic vibration tool may include a main shaft rotatably and fixedly coupled to an axis of a computer numerically controlled machine tool, first driving means connected to the main shaft and first connecting means to rotate in a plane parallel to the working surface, and a vibration tool. And a second drive means for connecting the tool housing including a second drive means for rotating the tool housing along a position perpendicular to the normal of the working surface. .

Hereinafter, with reference to Figures 2 to 6 attached to a preferred embodiment of the present invention that can specifically realize the above object.

That is, Figure 2 is a block diagram for explaining the configuration of the ultrasonic vibration tool, Figure 3 is a perspective view showing a state in which the mold finishing automation device using the ultrasonic vibration tool according to the present invention mounted on a computer numerical control machine tool, Figure 4 Is a front sectional view for explaining the internal configuration of the automated mold finishing apparatus according to the present invention, Figure 5 is a right sectional view for explaining the internal configuration of the automated mold finishing apparatus according to the present invention, Figure 6 is according to the present invention It is a plan sectional view for demonstrating the internal structure of the automated mold finishing apparatus.

In the present invention, the automated mold finishing apparatus using the ultrasonic vibrating tool is an ultrasonic vibrator 7 and an ultrasonic vibrator to amplify the amplitude of the ultrasonic vibrator 7 is connected to the external ultrasonic oscillator 6, as shown in FIG. An ultrasonic vibration tool (8) formed between the vibration amplification means (8) formed between the (7) and the tool portion (9), and the tool portion (9) attached to the vibration amplification means (8) to grind the workpiece by vibration. 5), and this ultrasonic vibration tool 5 is formed to be mounted on the computer numerical control machine tool A. FIG.

When the ultrasonic oscillator 6 supplies a high frequency current to the magnetostrictive vibrator, mechanical up and down vibration (20-30 cps having a small amplitude of several μm or less to prevent vibration of the vibrator) is generated by expansion and contraction of the vibrator. The amplitude is transmitted to the vibration amplifying means 8. The vibration amplifying means 8 is fixed to the same axis as the axis of the ultrasonic vibration tool 5 and is generally called a horn.

Accordingly, the ultrasonic vibration tool 5 has a main shaft 11 for rotatably and fixedly connected to the computer numerical control machine tool A, and the main shaft 11 so as to rotate in a plane parallel to the working surface of the workpiece B. 11) and the first driving means 10 connected by the first connecting means 12 and the tool housing 30 including the ultrasonic vibration tool 5 to rotate along a position perpendicular to the normal of the working surface. It is installed in the housing 40 including the second driving means 25 connected by the second connecting means 20 is mounted on a computer numerical control machine tool.

The main shaft 11 is mounted and connected to the collet chuck (C) of the computer numerical control machine tool (A) as shown in FIG. In addition, it is coupled through the housing 40 and the bearing (11a) to achieve a smooth rotation.

As shown in FIGS. 4 to 6, the first connection means 12 has one side connected to the main shaft 11 and the other side connected to the rotation shaft 10a of the first driving means 10. 10 is operated to rotate the rotating shaft (10a) is made of a belt for transmitting the rotational force of the rotating shaft (10a) to the main shaft 11 to rotate the main shaft 11 and the fixed housing (40).

The ultrasonic vibration tool 5 is installed inside the tool housing 30 so that the ultrasonic vibration tool 5 can rotate together when the housing 40 or the tool housing 30 rotates.

The second connecting means 20 allows the worm 27 formed on the rotation shaft 26 of the second driving means 25 and the worm wheel 33 attached to the tool housing 30 to be connected.

That is, when the worm 27 and the worm wheel 33 are rotated by the rotation of the second driving means 25, the tool housing 30 with the worm wheel 33 is rotated to operate the ultrasonic vibration tool 5 on the working surface. It is rotated on a plane perpendicular to.

In order to smoothly grind work in the general three-dimensional space, the degree of freedom of position of three degrees of freedom to allow the grinding means to contact the curved surface of the workpiece (B) and the degree of freedom of rotation of two degrees of freedom to maintain normal contact with the curved surface. It is preferable that a force degree of freedom of one or more degrees of freedom is formed so as to control the processing pressure in the normal direction.

Therefore, in the present invention, the position degree of freedom of three degrees of freedom in the general computer numerical control machine tool A is secured in advance, and two position degrees of freedom are further controlled from the first driving means 10 and the second driving means 25. Since the movement of the ultrasonic vacuum tool 5 can be precisely controlled, the polishing operation by the ultrasonic vibration tool can be automated.

That is, in the computer numerically controlled machine tool A, three degrees of freedom are secured, and the first driving means 10 and the second driving means 25 are controlled to move in the normal direction of the surface of the workpiece, thereby controlling two degrees of freedom. Further, if the ultrasonic vibration tool 5 is moved to process the surface of the workpiece, the polishing operation by the ultrasonic vibration tool, which was only possible by hand, can be performed by the computer numerical control machine tool A.

Referring to the effects of the present invention described above are as follows.

Ultrasonic vibration polishing, which was done only by hand, is possible by the automation system.

In addition, after the mold processing is performed in the computer numerical control machine tool, the mold finishing automation device using the ultrasonic vibration tool of the present invention can be easily mounted on the computer numerical control machine tool without moving the mold. As the grinding work maintains the continuity with the mold manufacturing process, efficient work is achieved, and three position degrees of freedom can be secured by using a numerically controlled machine tool, thereby miniaturizing the device. to further control the two rotational degrees of freedom in the finish mold automation device has the effect of being able to be machined easily polished mold view of the complex shapes.

By utilizing the universal material processing capability of ultrasonic vacuum tools, it is possible not only to grind various materials on computer numerically controlled machine tools, but also because it is a non-rotating process, it is applied to digging, grooving, shaping, cutting and rotating and conveying It is possible to cut the thread through the combination of and because the water is mainly used as the processing liquid, it is inexpensive and easy to handle.

Claims (3)

delete Ultrasonic vibrator 7 connected to the ultrasonic oscillator 6 connected from the outside, and vibration amplification means 8 formed between the ultrasonic vibrator 7 and the tool unit 9 to amplify the amplitude of the ultrasonic vibrator 7 And an ultrasonic vibration tool (5) comprising a tool portion (9) attached to the vibration amplification means (8) to grind the workpiece by vibration, to the computer numerically controlled machine tool (A) for polishing operation. Form to perform, The ultrasonic vibration tool (5) and the main shaft (11) to be fixed to the computer numerical control machine tool (A), and the main shaft (11) and the third to rotate in a plane parallel to the working surface of the workpiece (B) The first driving means 10 connected by the first connecting means 12 and the second driving means connected by the second connecting means 20 to rotate the tool housing 30 along the position perpendicular to the normal of the working surface. The mold finishing automation device using the ultrasonic vibration tool, characterized in that it is installed in the housing (40) comprising a (25) further has a two-degree of freedom in addition to the three-position freedom provided by the computer numerical control machine tool. The method of claim 2, An ultrasonic vibration tool 5 is installed inside the tool housing 30 so that the ultrasonic vibration tool 5 rotates together when the housing 40 or the tool housing 30 rotates. Automated mold finishing using the machine.