JP2000120777A - Metal plate having damping function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high damping function by forming a slit having a specified ranged width on a metal plate, and filling particles in the slit. SOLUTION: An inner slit 6 having both ends not opened to a base metal 1 is cut in the middle angle position of each circumferential slit 5 in the middle circumferential area of the base metal 1. The inner slit 6 is formed so that the line connecting both ends of the inner slit 6 is situated in a substantially radial position from the center of the base metal 1, and both the end positions are connected to each other by a zigzag slit. The slit is worked into a width dimension of 1 mm to 0.1 mm. Particles, desirably, magnetized particles or particles made clay-like by mixing with an adhesive non-solidifiable material are filled into only the inner slit 6 or also to the circumferential slit 5. Since the particles are filled in the slit 1-0.1 mm in width according to this structure, a high damping effect can be provided by the mutual rubbing of the particles. Further, it is easy to uniformly fill the particles into the slit and properly hold them without dropping, so that a high damping effect can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal cover for a machine or the like, or a metal plate-like tool body, such as a circular saw base used for wood working, metal working, stone working or the like. TECHNICAL FIELD The present invention relates to a metal plate having a vibration damping function of suppressing vibration generated at the time of processing for a metal plate which is easily vibrated.

[0002]

2. Description of the Related Art As a vibration control technique for a disk-shaped tool, it is known that a slit provided in a tool body is filled with a viscous soft resin or a soft metal piece to have a vibration control function.
For example, in Japanese Utility Model Publication No. 6-20562, as shown in FIGS. 5 and 6, a number of blade bases 101a divided in the circumferential direction are provided on an outer peripheral portion of a disc-shaped circular saw base metal 101, and between each blade base 101a. The slit 102 is formed in the dividing groove 101b, and the slit 102 is filled with a viscous material 103 made of a soft material having viscosity at room temperature, for example, chloroprene rubber or styrene butadiene rubber.

[0003]

The filling of the slit with a viscous material made of a soft material having a viscosity at room temperature has a certain vibration damping effect, but has not been satisfactory. Further, there is a problem that it is not easy to obtain a viscous material. The present invention has been made in view of the above-mentioned problems of the related art, and aims at filling a material that is easily available in a form different from the conventional filling material to provide a high vibration damping function. It is intended to provide a metal plate having the same.

[0004]

According to the first aspect of the present invention, there is provided a metal plate in which a slit having a width of 1 mm to 0.1 mm is formed, and the slit is filled with particles to obtain a vibration damping effect. When this metal plate is used as a base for a circular saw, since particles are filled in the slit, the particles rub against the side surfaces of the slit, or the particles rub against each other, thereby reducing vibration energy and suppressing vibration. The width of the slit is 1mm
Since the thickness is set to 0.1 mm, the particles completely enter the slit and are hardly dropped, so that a sufficient vibration damping effect can be obtained.

In the metal plate according to the second aspect of the present invention, the particles are magnetized particles. In the present invention, since the filled particles are magnetized, the particles, the metal plate and the particles are combined by magnetic force to prevent the particles from falling off. In addition, the magnetic force increases the movement resistance of the particles, and has a satisfactory large damping action.

The metal plate according to the third aspect of the present invention is such that the particles are kept in a state of blocking oxygen. In the present invention, oxidation of, for example, iron and aluminum in the alloy of the particles is prevented, so that the particles are hardly solidified, and the long vibration damping action is maintained.

In the metal plate according to the present invention, since the particles are mixed with a substance which is sticky and does not solidify, it is possible to prevent the particles from falling off by the non-solidifying sticky substance and to prevent the particles from moving. And has a satisfactory vibration damping action.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view in the case where the present invention is applied to a circular saw metal. A plurality of blades 2 are provided on the outer circumference of the circular saw metal 1 over the entire circumference. Are brazed with saw blades 3 made of cemented carbide or the like. Each blade 2
A blade bag 4 is formed between the blade bags.
Among them, a linear outer peripheral slit 5 which is opened at the bottom of the blade bag 4 toward the center of the base metal 1 is cut at an appropriate number of locations. The inner end of the outer peripheral slit 5 has a hook shape.

At an intermediate angular position between the outer peripheral slits 5 in the middle peripheral area of the base metal 1, an internal slit 6 whose both ends are not opened is formed in the base metal 1. A line connecting both ends of the internal slit 6 is located substantially radially from the center of the base metal 1, and the both ends are connected by a zigzag slit.
Small holes 7 for dispersing the stress concentration are formed at both ends. These slits are processed to have a width of 1 mm to 0.1 mm by laser processing.

The outer peripheral slit 5 and the inner slit 6
Of the inner slit 6 alone or the outer peripheral slit 5, preferably magnetized particles, for example, particles mixed with ferrite powder, alloy, iron powder, or an adhesive material, a sealing material, or other adhesive soft resin material. And filled with clay-like particles that do not solidify. The particles include clay, porcelain clay, and resinous clay called clay. In addition, metal powder, quartz powder, sand, or the like can be used, and after the particles and powder are filled in the slit, the outside can be treated with an adhesive so that the particles and powder do not fall off. Although the hook-like portion is filled with particles in the outer peripheral slit 5, the small holes 7 are not normally filled with particles in the inner slit 6. It may be filled as needed.

[Comparative Test of Vibration Suppression Effect of Circular Saw of Present Invention and Conventional Circular Saw] A circular saw base 1 shown in FIG. 1 is used as an example of the metal plate shape of the present invention. A test was performed by applying four types of filling methods to the slits of the base metal 1. Further, a test was performed using a circular saw base 11 shown in FIG. 2 as an example of the prior art.

Test 1 [Circular saw conditions] (both FIGS. 1 and 2) Diameter D = 305 mm, base metal thickness t = 2.2 mm, shaft hole d
= 25.4 mm, the number of blades Z = 100, and the base metal fixing flange diameter Df = 100 mm. In FIG. 1, both the outer peripheral slit 5 and the inner slit 6 are provided at five locations, the slit width = 0.2 mm, the total length of the outer peripheral slit 5 is about 25 mm,
Total length of internal slit 6 is about 150mm, diameter of small hole 7 is 4m
m.

In FIG. 2, the outer peripheral slits 12 are provided at five locations and the slit width is 0.2 m toward the center of the circular saw.
m, the length was about 10 mm linearly, and small holes 13 each having a diameter of 5 mm were provided at the center end. The small hole 13 was chamfered by 1c on both sides of the base metal 11 as shown in FIG.

[Filling method] For the base metal 1 shown in FIG. No. 1 fills only the outer peripheral slit 5 with magnetized particles. NO. 2 fills only the internal slit 6 with magnetized particles. NO. No. 3 does not fill any slits. NO. Reference numeral 4 only fills the internal slit 6 with chloroprene rubber, which is a soft resin having viscosity at room temperature.

With respect to the base metal 11 shown in FIG. In No. 5, an aluminum piece 14 was packed in a small hole 13 and caulked from both sides of the base metal 11 to prevent falling off [FIG. 4]. The magnetized particles were used by finely pulverizing a commercially available permanent magnet with a hammer or the like.

[Test Method] The sound of a circular saw base hit with a hammer was collected through a sound level meter, and the change in noise value was measured using an FFT (fast Fourier transform) device. And the noise generated by the vibration after the impact is 8 from the value of 110 dBA.
The vibration decay time until it decreased to 0 dBA was measured. Table 1 shows the measured values.

[0018]

[Table 1]

[Test Results] Sample NO. In FIG. 5 (FIG. 2), when the small holes 13 of the outer peripheral slit are filled with aluminum pieces, the decay time is 0.3 seconds or more, and the vibration damping property is not sufficient and cannot be expected. ○ Sample No. 1 and sample No. 1 No. 3 and sample no. 2 and Sample No. It is recognized from FIG. 3 that the vibration suppression effect increases when the slits of the same shape are filled than when they are not filled. ○ Sample No. 2 and Sample No. It is recognized from FIG. 4 that the present invention in which particles are filled has a much larger vibration damping effect than filling a slit of the same shape with a resin of a known technique, which is almost a satisfactory value. ○ Sample No. 1 and sample No. 1 In the case of the same filling material, it is recognized that filling the long slit has a larger vibration damping effect, which is a satisfactory value.

As the magnetized particles contain more iron, the finer the particles, the more easily oxidation occurs, and the more the particles are likely to clump. As a countermeasure against this, it is desirable to fill the slit with oil-pulverized fine powder and form an air-blocking film on the outside with a resin material or the like. Alternatively, if magnetic powder coated with resin is used, it will have the effect of preventing oxidation and preventing particles from falling off.
A great damping effect can be obtained.

The magnetized particles include barium ferrite and strontium ferrite ferrites and samarium-cobalt magnets as strong magnets, and neodymium-iron-boron-based rare earths as new magnets. Those which are inexpensive and easily available are ferrite-based and can be made into powder, and are not bad in oxidation resistance, and are therefore most suitable for use. Some permanent magnet materials have prominent weak points that are easily rusted. In particular, special attention should be paid to rust prevention for particles of common permanent magnets that are commercially available. Alternatively, a particle obtained by pulverizing an alnico magnet may be used.

Test 2 [Circular saw condition] The same as Test 1 for FIG. [Filling method] For the base metal 1 in FIG. 6 is filled with clay only in the outer peripheral slit 5; 7 is clay filled only in the internal slit 6 [Test method] Same as Test 1 Table 2 shows the measured values.

[0023]

[Table 2]

[Test Results] Sample No. In sample No. 6, which was filled with magnetized particles, Although slightly inferior to 1, almost the same effect is observed. Sample No. At 7,
Sample No. 1 filled with magnetized particles Although slightly inferior to 2, an equivalent effect was recognized and a satisfactory value. As described above, although the magnetized particles were used as the particles in the test 1, the test 2 was used instead of the magnetized particles as in the test 2.
Even if the clay itself is filled or the particulate matter is mixed with a viscous substance to make it clay-like and filled into the slit, sufficient vibration damping properties can be obtained.

[Summary] These magnetic couplings or clay-like couplings are not completely fixed couplings. Therefore, if the base metal vibrates, the coupling surfaces rub against each other to produce a damping action. Therefore, the type of the particles used here is not particularly limited. According to the test, when the width of the slit is 1 mm or more, particles are hardly retained in the slit, and the vibration-damping effect is not sufficiently exhibited. It was also found that shedding occurred during use.

Conversely, it was found that when the width of the slit was 0.1 mm or less, the particles could not sufficiently enter the slit, tended to be insufficiently filled, and the vibration damping effect was not sufficient. Therefore, the width dimension of the slit is 1 mm
０．１0.1 mm was effective. When only the non-magnetized particles are filled and not clay-like, the width of the slit is preferably set to 0.5 mm to 0.1 mm to increase the amount of particles remaining in the slit and obtain a high vibration damping effect. Can be It is also possible to use a conventionally known vibration suppression technique in combination with the present invention. In the present test, the base of the circular saw was described. However, the present invention is also effective in suppressing vibration of a metal plate of a cover of a machine or the like other than the base of the circular saw.

[0027]

Since the present invention is configured as described above, the following effects can be obtained.

[0028] The metal plate according to claim 1 has a width of 1 mm to 0.1 m.
Since the m slits are filled with particles, a high vibration damping effect can be obtained by the friction of the particles. In addition, it is easy to uniformly embed the particles in the slits, so that the particles do not fall off, are properly held, and a high damping effect can be obtained.

In the metal plate of the present invention, since the magnetized particles are used, the inner wall of the slit and the particles and the particles are bonded to each other by a magnetic force. The effect can be obtained.

In the metal plate according to the third aspect, since the magnetized particles do not come into contact with oxygen, oxidation is prevented, heat generation due to oxidation does not occur, and the particles are prevented from solidifying into a dumpling, and the vibration damping effect is maintained for a long time. be able to.

In the metal plate according to the present invention, the particles are mixed with a viscous substance which does not solidify and are filled in the slit in a clay state, so that the metal plate hardly falls off from the slit and a high vibration damping effect is maintained. You.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a side surface of a circular saw base used in the present invention.

FIG. 2 is an explanatory diagram showing a side surface of a circular saw base used for a test as an example of a conventional technique.

FIG. 3 is a sectional view of the small hole portion of FIG. 2;

FIG. 4 is a view showing a state in which an aluminum piece is attached to the small hole of FIG. 3;

FIG. 5 is an explanatory side view of a conventional circular saw base.

FIG. 6 is a sectional view of a slit part of FIG.

[Explanation of symbols]

 1 Circular saw base metal 5 Outer slit 6 Inner slit

Claims (4)

[Claims] 1. A metal plate having a vibration damping function, wherein a slit having a width of 1 mm to 0.1 mm is formed, and the slit is filled with particles to obtain a vibration damping effect. 2. The metal plate having a vibration damping function according to claim 1, wherein the particles are magnetized particles. 3. The metal plate having a vibration damping function according to claim 1, wherein the particles are kept in a state of blocking oxygen. 4. The method according to claim 1, wherein the particles are mixed with a tacky substance which does not solidify to form a clay.
A metal plate having a vibration damping function according to the above item.