JPH02311260A - Disc type cutting blade - Google Patents

Abstract

PURPOSE:To prevent the generation of noise during idle running and during cutting by forming a cutting blade main body out of a damping steel plate. CONSTITUTION:Vibration energy of bending vibration generated during rotation and cutting of a rotational blade is damped by conversion into thermal energy through debris deformation of a viscoelastic resin 3 arranged in an intermediate layer of a damping steel plate 2 that forms the rotational blade. Noise protection and damping are thus achieved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a disc-shaped cutting blade used for cutting concrete products such as rocks and blocks, walls and paved roads, as well as metal materials. It is something.

[Prior Art] Conventionally, disc-shaped cutting blades have been known, in which a blade part is formed along the outer periphery of a thin disc made of a steel plate, or a blade part made of super steel chips, diamond powder, etc. is attached. There is.

These cutting blades cut objects by inserting a mounting hole formed in the center into an electric motor or the rotating shaft of a cutting machine that uses the electric motor as a drive source, and can cut solid objects such as concrete quickly and easily. It can be easily cut.

[Problems to be Solved by the Invention] However, the disc-shaped rotary blade generates wind noise due to bending vibration that occurs when rotating at high speed, and also generates high-frequency cutting noise due to friction with the object to be cut during cutting. , causing noise pollution. Further, the bending vibration of the cutting blade makes it difficult for the cutting blade to accurately cut the object to be cut, and there are also problems such as the cutting operator suffering from white wax disease.

One way to solve these problems is to form the rotary blade body from a damping alloy, which is a material that has a damping function added to the metal itself, but damping alloys have poor heat treatability and workability. In addition, they are expensive, and are not suitable for rotary blades, which come in many different shapes and performances depending on the type and purpose of the object to be cut, and which are easily worn out due to abrasion of the blade.

The present invention has been made in view of these circumstances, and provides a disc-shaped rotary blade that generates little noise and vibration, is safe for workers, and is capable of performing accurate cutting work. The purpose is to

[Means for Solving the Problems] The present invention is a means for solving the above problems by providing a configuration in which the cutting blade body is formed of a vibration-damping steel plate.

[Function] The vibration energy of the bending vibration that occurs when the rotary blade rotates and cuts is converted into thermal energy and attenuated by the shear deformation of the viscoelastic resin placed in the middle layer of the damping steel plate that forms the rotary blade. Soundproofing and damping.

[Example] Next, embodiments of the present invention will be described based on the drawings.

Figures 1 and 2 show an embodiment of the present invention, which is formed entirely into a thin disc shape with a predetermined diameter and thickness, similar to conventional disc-shaped rotary blades. .

The cutting blade main body 1 is formed of a vibration-damping steel plate. This damping steel plate uses a conventionally known type in which a viscoelastic resin 3 made of, for example, a copolymer of vinyl acetate resin and vinyl chloride resin is arranged between a pair of steel plates 2, 2.
Shaped by punching, etc. Further, the cutting blade main body 1 has a mounting hole 4 formed in the center, and a blade portion 5 made of diamond powder is attached along the outer periphery. Although the method of attaching the blade part 5 does not matter, a laser beam that can heat only the thin surface layer and has less effect on the viscoelastic resin 3 due to heat than brazing, etc., which transmits heat to the entire cutting blade body 1. Welding with a heat source is preferred. Also, both surfaces 2a
, 2a, a large number of wave grooves for cooling are formed in a spiral shape.

In this embodiment, like the conventional disk-shaped rotary blade, the mounting hole 4 formed at the center can be inserted into the rotating shaft of an electric motor or a conventionally known hand-held or mechanical cutting machine using an electric motor as a drive source.・Turn the blade 1 and bring the blade 5 attached to the outer periphery into contact with the object to cut it.

At this time, since the rotary blade body 1 is formed of a damping steel plate, the vibration energy of the bending vibration generated during rotation and cutting of the rotary blade causes shear deformation of the viscoelastic resin 3 disposed in the middle layer of the vibration damping steel plate. It converts into thermal energy and attenuates it, providing soundproofing and vibration damping effects. Therefore,
Noise generation is suppressed, harmful vibrations are not transmitted to the worker, and the workpiece is cut by the thickness of the rotary blade, allowing for accurate cutting. At the same time, there is less loss of objects to be cut.

FIG. 3 shows a different embodiment of the present invention, in which a large number of cooling holes 6 are formed in place of the cooling wave grooves formed on the surfaces 2a, 2a of the rotary blade main body l in the above embodiment. has been done. Further, the rotary blade main body 1 has a structure in which a viscoelastic resin 3 is disposed between steel plates 2, 2 as in the embodiment shown in FIG.
are glued to each other. Therefore, the adhesiveness between the steel plates 2.2 is good and the durability is improved. When bonding the steel plates 2, 2 together by spot welding 7, very good spot welding can be performed if the viscoelastic resin 3 is electrically conductive.

The conventionally commonly used damping steel plate used in the above example has a heat resistance temperature of about 250°C, and can withstand use for conventional rotary blades, but it has a viscoelastic property. If the resin 3 is replaced with one that is more heat resistant, it will be possible to handle cutting that generates even higher temperatures. Further, in the above embodiment, the blade portion 5 has a structure in which diamond powder is attached along the outer periphery of the cutting blade main body 1, but the structure is not limited to this, and the same implementation is possible when using a carbide tip or the like. Needless to say.

[Effects of the Invention] According to the present invention having the above configuration, bending vibrations caused by rotation are attenuated by the viscoelastic resin disposed between the vibration damping steel plates forming the rotary blade body, so that during idling and cutting. The workpiece is cut by scraping the workpiece by the thickness of the rotary blade, making it possible to cut accurately without causing any noise or harmful vibrations to the worker. There is also less loss of cut materials. Furthermore, it can be easily produced by the same method as conventional disc-shaped rotary blades in which the rotary blade body is formed of a steel plate, and has various advantages such as excellent productivity and low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG.
FIG. 3 is an enlarged sectional view taken along the line ■-■ in the figure, and a perspective view showing a different embodiment of the present invention. ■... Rotary blade body, 2, 2... Steel plate, 3... Viscoelastic resin, 4... Mounting hole, 5... Blade part, 6
...Through hole, 7...Spot welding. Agent Mutsuaki Nozawa yQ-2,'l Figure 3

Claims (1)

[Claims] A disc-shaped cutting blade characterized in that the cutting blade body is formed of a vibration-damping steel plate.