Reuleaux-triangle-shaped circular saw single blade to be attached to electric circular saw

Abstract

To accurately cut a resin foam based heat insulator for construction having a surface coated with aluminum thin film / thin plate while suppressing generation of dust.SOLUTION: A circular saw having a Reuleaux triangle shape in Fig. 1 and having a blade tip being a single blade formed by polishing is attached to an electric circular saw for woodworking being a handheld type electric tool, and a resin foam based heat insulator for construction having a surface coated with aluminum thin film / thin plate is cut.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an electric circular saw blade for cutting a building foamed resin heat insulator coated with an aluminum thin film, thin plate, or fiber sheet with a hand-held electric tool, an electric circular saw, while suppressing dust.

Background Art

[0002] In the cutting of a building foamed resin heat insulator with a conventional hand-held electric tool, an electric circular saw, several dozen saw blade-shaped hard tips are arranged on the outer periphery of a circular metal plate. For example, when the metal plate is 1 mm thick, the hard tips protrude left and right and the cutting width is 1.8 mm. In this case, when cutting a 50-mm-thick foamed resin heat insulator in a single cut with a cutting distance of 910 mm, hundreds of thousands of dust particles are generated. The daily workload exceeds 100 times. This large amount of dust can harm the health of workers. Also, it is known that cutting on the roof of a building can cause the dust to make the worker's feet slip, which is dangerous. Since the dust generated by cutting the foamed resin heat insulator is light and fine, it will scatter if there is wind, causing nuisance to the neighborhood and requiring a great deal of time and labor for cleaning.

[0003] Some electric tool manufacturers and peripheral equipment manufacturers around the world are dealing with dust in some products, but this is still an unsolved problem. There is also a method of cutting without generating dust with a cutter knife of a hand tool, etc., but cutting by hand is slow, the cutting angle is extremely inaccurate, and it is difficult to cut according to the roof slope, resulting in poor construction. Therefore, it is common to perform cutting construction quickly and accurately with an electric circular saw with an accurate cutting angle without alternative.

Summary of the Invention

Problems to be Solved by the Invention

[0004] As a means of suppressing dust in the cutting of foamed resin thermal insulation materials for construction, there is a method of cutting with a round saw equipped with a Roulo triangular blade. A normal chip saw round saw blade has dozens of saw-shaped hard chips arranged on the outer periphery of a circular metal plate and rotates, scratching the workpiece repeatedly as it rotates and cutting through. However, the Roulo triangular blade cuts into the workpiece so that the blade slides in as it rotates. It can reduce the dust of the foamed resin thermal insulation material for construction that melts by heat to less than one percent. For the Roulo triangular blade, the reduction of the foamed resin thermal insulation material due to cutting is about 0.6 mm for every 1 mm of the metal plate, and the remaining 0.4 mm becomes the cutting resistance. For a normal foamed resin thermal insulation material for construction, the remaining 0.4 mm does not pose a problem. However, for a foamed resin thermal insulation material for construction coated with an aluminum thin film or thin plate, there is no reduction due to the cutting of the aluminum thin film or thin plate, and the full 1 mm thickness of the round saw blade becomes the cutting resistance, causing the straightness of the electric round saw to be lost. The present application aims to provide an electric round saw blade that can cut in a straight line even for a foamed resin thermal insulation material for construction surface-coated with an aluminum thin film or thin plate.

Means for Solving the Problem

[0005] By dividing the aluminum thin film or thin plate attached to the foamed resin thermal insulation material for construction into a flat side that does not receive the cutting resistance and an inclined side that pushes away the cutting resistance, and grinding it into a single-edge blade with the end of the flat side as the cutting edge, the straightness of the electric round saw can be maintained.

[0006] There is a method of adjusting a saw blade called "loosening the waist" for saws that have existed since ancient times and for modern electric round saw blades with rotary blades. The cutting edge of the saw blade is protruded left and right (asari), and if there are slight distortions or bulges on the flat surface of the saw blade metal plate, it will generate extra resistance during cutting, so the flat surface of the saw blade metal plate is thinned in advance. For the electric round saw blade, the cutting width is 1.8 mm with a 1 mm metal plate and a 0.4 mm protrusion of the cutting edge left and right (asari) to make it easier to pass through the 1 mm metal plate. In this application, since the cutting width of the metal plate is 1 mm and the cutting width is 0.6 mm or less, it is a single-edge blade. By using holes and grooves that completely punch out the flat part to form cavities, the cutting resistance of the flat part of the metal plate is reduced. If the area of the flat part is halved, the probability of distortion and swelling is also halved, and the friction is also halved. In addition, the holes and grooves of the electric circular saw blade are known to have functions such as passing air for cooling and heat dissipation, saving power due to the weight reduction of the metal plate, and buffering the load on the sharp edge. In this application, they also play a role in indicating the distance from the center.

Advantages of the Invention

[0007] When cutting the building foam resin-based heat insulation material coated with an aluminum thin film or thin plate, the operator can complete the work without being exposed to a large amount of dust.

[0008] When cutting the building foam resin-based heat insulation material coated with an aluminum thin film or thin plate, the operator can significantly shorten the cleaning time.

Brief Description of the Drawings

[0009]

Figure 1

Embodiments for Carrying Out the Invention

[0010] The triangular round saw blade of the present roulo is attached to and rotated on an electric round saw for woodworking of a hand-held power tool, and is used to cut a foamed resin-based heat insulating material for construction whose surface is coated with an aluminum thin film or thin plate as a material to be cut.

[0011] It is difficult to manufacture buildings such as houses according to theoretical values, and errors of several millimeters occur. Since the electric round saw for woodworking of a hand-held power tool can be carried and used by a person, it is possible to finely adjust the shape and dimensions of the heat insulating material by cutting the foamed resin-based building heat insulating material already attached to the roof or the wall of the building, thereby eliminating the error.

Example

[0011] The triangular round saw blade of the roulo was devised and used more than 21 years ago. When rotating and using, experiments have been repeated to explore the risks and problems by contacting wood, nails, etc. which are not the original materials to be cut, but it is still used without damage or deformation. However, it has been found that the straightness is lost for the foamed resin-based heat insulating material for construction coated with an aluminum thin film or thin plate on one or both sides for the purpose of improving the performance of the conventional foamed resin-based heat insulating material for construction. In order to overcome this, the formation and polishing of the cutting edge are made as a single blade, and the straightness can be maintained.

Industrial Applicability

[0012] In Japan, due to the international trend of reducing energy consumption for building heating and cooling and reducing the environmental load, such as ZEH of the Agency for Natural Resources and Energy and the obligation of high-insulation houses in the UK, the demand for foamed resin-based heat insulating materials for construction is increasing. However, if you want to cut quickly and accurately, cutting with an electric round saw is common, and it is a well-known fact in Japan and all over the world that operators are troubled by a large amount of dust. Regarding the cutting construction of foamed resin thermal insulation materials for buildings, various electric tool companies around the world have developed and sold jigsaw blades, table circular saw blades, and dedicated electric tools as some countermeasures. However, they are far from meeting the requirements of this application in terms of cutting speed, accuracy of cutting angle, performance of suppressing dust in the cutting of foamed resin thermal insulation materials for buildings with heat-melted materials, etc. In the cutting of foamed resin thermal insulation materials for buildings, the product of this application sets the global standard.

Claims

Claim 1 A rotary circular saw blade for a hand-held power tool for woodworking, which cuts a foamed resin-based heat insulating material for construction surface-coated with an aluminum thin film or thin plate while suppressing dust, wherein the outer shape of the rotary circular saw blade that rotates and cuts a metal plate is a lozenge-shaped triangle, and the polished cutting edge has one side as a plane and the other side is inclined from near the cutting edge, and it is a single-edge rotary circular saw blade with the end of the plane as the cutting edge. Claim 2 The rotary circular saw blade according to claim 1, wherein the rotary circular saw blade has holes or grooves indicating each intermediate distance from the rotation center to the apex of the cutting edge.

Images