JPH08126912A - Manufacture of low noise and low vibration type rotary saw blade - Google Patents

Abstract

PURPOSE: To manufacture a rotary saw blade with small noise to be generated from the saw blade and a work to be sawn in the cutting in a simple process. CONSTITUTION: A viscoelastic resin layer 3 is formed between two metallic restraint plates 2 to make a base plate 1 through adhesion and pressing. A hard tip 4 or a diamond tip is directly joined with this base plate 1. The metallic restraint plates 2 are blade-formed before or after the hardening. The viscoelastic resin layer 3 is the polyester resin layer or the polyurethane resin layer, and formed by drying the resin layer after the resin solution is applied to the inner surface side of the metallic restraint plates 2, or by adhering the resin film thereto. Both sides of the base plate 1 are polished after the spot welding or the riveting is achieved in the circumferential direction. A rotary saw blade where the noise generation associated with the cutting is remarkably suppressed can be manufactured in this method. This rotary saw blade has the equivalent durability and rotational stability to those of the conventional rotary saw blade.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a low noise and low vibration rotary saw blade for cutting steel, wood, stone, concrete, asphalt, bricks, tiles and the like.

[0002]

2. Description of the Related Art In recent years, in factories and civil engineering work sites, noise accompanying the processing of materials has become an ignorable influence on workers and neighbors. Especially steel materials,
The noise level generated by cutting wood, stone, concrete, asphalt, bricks, tiles, etc. has a high sound pressure level,
When working for a long period of time, there are problems such as hearing loss. However, the cause of noise from the rotating saw blade is that the saw blade and the object to be cut vibrate due to friction between the saw blade and the object to be cut that are rotating at high speed, so from the original purpose of the rotating saw blade, It is difficult for the conventional saw blade to reduce the sound generated from the saw blade during cutting.

In order to reduce the noise generated from the saw blade and the object to be cut during cutting, Japanese Utility Model Publication No. 2-7015 discloses
It is disclosed that a plurality of base metals are overlapped and partially welded to reduce vibration between inner surfaces of the base metal.
JP-A-48020 discloses that a viscoelastic resin layer and a constraining plate are attached to a part of a saw blade to reduce vibration.

[0004]

By the way, the conventional low-noise low-vibration rotary saw blade has been subjected to friction due to metal contact or vibration control for a part of the saw blade, so that the expected noise reduction cannot be achieved. It was Further, the conventional low-noise and low-vibration rotary saw blade requires a lot of spot welding, and a damping resin and a constraining plate have to be separately attached on the front and back sides, which complicates the manufacturing process.

An object of the present invention is to make it possible to manufacture a low-noise low-vibration rotary saw blade capable of reducing the noise generated from the saw blade and the object to be cut at the time of cutting by a simple manufacturing process.

[0006]

According to the present invention, a viscoelastic resin layer is formed between two metal constraining plates and bonded and pressure-bonded to form a base metal, and a hard chip or a diamond chip is directly bonded to the base metal. In the method for manufacturing a low-noise low-vibration rotary saw blade, preferably, the blade-shaped forming of the two metal constraining plates is performed before or after quenching.

The viscoelastic resin layer is formed by applying a resin solution to the inner surface of the metal constraining plate by screen printing, bar coater, brush coating, or roll coating, and then drying, or a resin film. It is desirable to form by pasting.

Further, it is preferable to polish both surfaces of the base metal after spot welding or riveting in the circumferential direction of the base metal.

It is more preferable that the viscoelastic resin layer is a polyester resin layer or a polyurethane resin layer.

[0010]

1 and 2 are a front sectional view and a side view showing an example of a rotary saw blade manufactured by the manufacturing method of the present invention. Since the rotary saw blade during cutting the material has a complicated vibration mode, and it is difficult to suppress the vibration only by the base metal of the single plate. The viscoelastic resin layer 3 is arranged so that the vibration of the base metal generated when cutting the material is damped by the viscous resistance generated by the strain of the viscoelastic resin layer 3.

The material, shape, number of chips, etc. of the metal constraining plate 2, the hard tip 4, and the diamond tip can be variously selected according to the specifications of the material to be cut, and are not particularly limited. Although the hard chip 4 is bonded to the entire circumference of the base metal 1, only a part thereof is shown in FIG.

The intermediate viscoelastic resin layer 3 includes, for example, amorphous polyester, amorphous polyamide, polyimide, polyurethane, polyurethane urea, polyurea, acrylic resin, epoxy resin, vinyl acetate resin, amorphous resin. Polyolefin-based resins, blends of various resins, and copolymers can be used, but cross-linking of polyfunctional isocyanates and epoxy resins, etc., in consideration of adhesiveness at high temperatures and long-term durability. A thermosetting resin is preferably used with an agent. Polyester-based resins and polyurethane-based resins are particularly preferable because they have excellent adhesion to metals and good vibration damping properties.

The viscoelastic resin layer 3 sandwiched between the two metal constraining plates 2 has the effect of low noise and low vibration even if simply laminated, but the rigidity of the rotary saw blade at the time of cutting is insufficient. Therefore, it is necessary to improve the adhesion between the metal constraining plate 2 and the viscoelastic resin layer 3. Therefore, in the manufacturing method of the present invention, the viscoelastic resin layer 3 is provided between the two metal constraining plates 2 and then pressure-bonding is performed to improve the adhesiveness, and to secure the rigidity and strength of the base metal 1. did. In this way base metal 1
After securing the rigidity and strength, the hard tip 4 or diamond tip is brazed and directly joined by laser welding, electric resistance welding, friction joining or the like. Shaking at the time of rotation due to insufficient rigidity of the base metal 1, poor smoothness of the cut surface caused by the shake, chip loss, etc. are prevented by directly joining the chip to the base metal 1.

In order to stably bond the hard tip 4 or the diamond tip to each other, the two metal constraining plates 2 need to be subjected to blade-type molding either before or after quenching.

The viscoelastic resin layer 3 is formed by applying a resin solution to the inner surface of the metal constraining plate 2 by screen printing, bar coater, brush coating, or roll coating and then drying, or by forming a resin film. It is formed by pasting.

When the resin liquid is applied by screen printing, bar coater, brush coating, or roll coating, a masking material suitable for the size and shape of the metal constraining plate 2 is prepared in advance, and the shape of the resin-coated surface and the resin are applied. Make sure that the coating thickness is uniform. It is desirable that the metal constraining plate 2 after applying the resin solution be dried by heating to remove the solvent. If the solvent remains, the adhesive strength decreases, which is not preferable.

When the film is attached, the shape of the film is adjusted in advance so as to match the size and shape of the metal constraining plate 2, the metal constraining plate 2 on one side is placed so that the center is not displaced, and the other side is constrained. The metal constraining plates 2 of are stacked.

After the resin is sandwiched between the two metal constraining plates 2 by any of the above-mentioned methods, they are pressure-bonded by a pressing machine or the like in order to stabilize the adhesive strength. It is more preferable to heat at the time of pressure-bonding, because the adhesive strength becomes more stable and higher.

In order to increase the rigidity of the base metal 1, two metal constraining plates 2 may be joined at multiple points in the circumferential direction of the base metal 1 by spot welding or riveting. To facilitate spot welding, stainless powder, nickel powder, iron powder,
Conductive metal powder such as chromium powder may be added.

After the two metal constraining plates 2 are spot-bonded, both sides of the base metal 1 are polished to smooth the unevenness of the joint. If smoothing is not performed by polishing, the cut surface of the material to be cut is likely to be scratched, which is not preferable.

As the viscoelastic resin layer 3, a polyester resin layer or a polyurethane resin layer is preferable because it has excellent adhesion to a metal and good vibration damping property. More preferably, a thermosetting resin is prepared by adding a curing agent to improve the adhesiveness at high temperature.

In order to improve the adhesive strength between the metal constraining plate 2 and the viscoelastic resin layer 3, the bonding surface of the metal constraining plate 2 may be subjected to a surface modification treatment. Examples of the surface modification treatment include chromate treatment, silane coupling agent treatment, and titanate coupling agent treatment. Further, similarly, an inorganic powder component may be added to the viscoelastic resin layer 3. Although a wide range of inorganic powders can be used, calcium carbonate, talc, silica, carbon black, alumina, titanium oxide, zinc white, graphite, mica and the like are preferable because they have little influence on the damping characteristics.

[0023]

EXAMPLE A solvent-diluted polyester-based viscoelastic resin was applied to one surface of a quenched metal constraining plate by screen printing in Example 1 and using a bar coater in Example 2, and then in a drying oven at 160 ° C. After drying for 1 minute to remove the solvent, and after cooling, the base metal is made by hot pressing with another hot plate at 160 ° C together with another metal constraining plate to form a base metal, then blade molding, and finally brazing. The hard chips were joined by.

Example 3 was the same as Example 1 and Example 2 except that a urethane resin film cut into a circle was attached to a metal constraining plate.

In Example 4, spot welding was performed on the circumference of 25 mm inside the chip mounting portion of the base metal manufactured in the same manner as in Example 1, both sides were polished, and then the chip was brazed.

The viscoelastic resin layers of the rotary saw blades manufactured in the examples all have a tan δ value of 0.3, which is an index of the damping property of the resin at 20 ° C., and the resin layer thickness is 0.04.
It was ~ 0.06 mm. The size of the rotary saw blade and the number of chips are both 308 mm in outer diameter and 6 in chips.
It was set to 0.

As a comparative example, a single plate rotary saw blade and a conventional low noise rotary saw blade in which two base metals are spot-welded are used.
Model steel angle (6t x 50w x 50h mm) and C type steel channel (2.3t x 100w x 50h)
(mm) by comparing the noise when cutting
The noise generated when cutting steel materials was compared. Noise is 12m
Rotation speed at no load is 1500 rpm in the center of the room of × 10m
Place the tip saw cutter on the concrete floor,
The steel material was cut at a distance of 50 cm on the floor, with the microphone surface of the sound level meter parallel to the saw blade surface opposite to the motor of the tip saw cutter, and the steel material was cut to receive sound. As a sound level meter, NL-01A manufactured by Rion Co., Ltd. was used, and the value obtained by applying the A characteristic filter was evaluated. The results of the evaluation test are shown in Table 1.

[0028]

[Table 1]

The rotary saw blades manufactured in Examples 1 to 4 were found to have a significant noise reduction effect as compared with the normal rotary saw blade of Comparative Example 1. Further, a high noise reduction effect was recognized even compared with Comparative Example 2 which is a conventional low noise and low vibration rotary saw blade. Further, the rotary saw blade manufactured in the example is equivalent in durability and rotational blur to the normal rotary saw blade of a single base metal, and a high-quality rotary saw blade having no practical problem was obtained.

[0030]

According to the present invention, it is possible to manufacture a rotary saw blade capable of remarkably suppressing noise generation when cutting a steel material.
The manufactured rotary saw blade has the same performance as the conventional ordinary rotary saw blade in terms of durability and rotation stability. Further, the present invention makes it possible to manufacture a very useful rotary saw blade capable of suppressing noise generation without reducing the efficiency of material cutting, simply, quickly and highly accurately.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an example of a rotary saw blade manufactured by the method of the present invention.

FIG. 2 is a side view showing an example of a rotary saw blade manufactured by the method of the present invention.

[Explanation of symbols]

 1 base metal 2 metal restraint plate 3 viscoelastic resin layer 4 hard chip

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Katsutoshi Sugawara 3-2-4 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Nippon Steel Corporation Osaka Branch (72) Inventor Kunio Yamaguchi 1475 Kashiyama-cho, Ono City, Hyogo Prefecture −132 Yamaguchi Metal Co., Ltd. (72) Inventor Hirokazu Mizuike 1475-132 Kashiyama-cho, Ono City, Hyogo Prefecture Yamaguchi Metal Co., Ltd. (72) Inventor Yoneo Matsuda 1475-132 Kashiyama-cho, Ono City, Hyogo Prefecture Yamaguchi Metal Co., Ltd. (72) Inventor Masanori Nakamura 2-1-1 Katata, Otsu City, Shiga Prefecture Toyobo Co., Ltd.

Claims (5)

[Claims] 1. A low-noise low-characteristic characterized in that a viscoelastic resin layer is formed between two metal constraining plates, bonded and pressure-bonded to form a base metal, and a hard chip or a diamond chip is directly bonded to the base metal. Method of manufacturing vibrating rotary saw blade. 2. The method for manufacturing a low-noise low-vibration rotary saw blade according to claim 1, wherein the blade mold forming of the two metal constraining plates is performed either before or after quenching. 3. The viscoelastic resin layer is formed by applying a resin solution to the inner surface of the metal constraining plate by screen printing, bar coater, brush coating, or roll coating, and then drying, or The method for manufacturing a low-noise low-vibration rotary saw blade according to claim 1 or 2, wherein the method is formed by pasting a resin film. 4. The low-noise low-vibration rotary saw according to claim 1, wherein both sides of the base metal are polished after spot welding or riveting is performed in a circumferential direction of the base metal. Blade manufacturing method. 5. The method for manufacturing a low noise low vibration rotary saw blade according to claim 1, wherein the viscoelastic resin layer is a polyester resin layer or a polyurethane resin layer.