JPH0733533U - Circular saw - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to effectively suppress the vibration generated at the outer peripheral portion of the circular saw body, and to significantly reduce the generation of metallic noise due to the vibration, and at the same time, the circular saw body surrounded by the slits. Provide a circular saw that can prevent a part from popping out. [Structure] A plurality of slits 4 extending in the circumferential direction and extending in the radial direction are formed on the outer peripheral portion of the circular saw body 2, and each slit 4
Is formed with discontinuous portions 5 and 6 at required positions, and the opposing ends of the adjacent slits 4 and 4 are opposed to each other in the radial direction of the circular saw body 2 and are interleaved or interdigitated in the circumferential direction. It is formed so as to extend to the vicinity, and a vibration damping material is loaded in each of the slits 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a circular saw that cuts a metal material, and more particularly to a circular saw that suppresses vibration of the outer peripheral portion of the circular saw body that occurs during cutting and reduces metal noise generated by the vibration.

[0002]

[Prior art and its problems]

 A circular saw in which a plurality of arcuate slits are formed on the outer peripheral portion of the circular saw body to suppress the metallic noise associated with the vibration of the circular saw body is conventionally known from Japanese Utility Model Publication No. 1-92318. However, in this type of circular saw, the slits formed in the circular saw body have a large circumferential spacing, so that vibrations generated at the outer periphery of the circular saw body are transmitted from the non-slit areas between the slits to the circular saw body. Since it propagates to the inner peripheral part of the device and a sufficient damping effect is not obtained and each slit is formed continuously from one end to the other, it is surrounded by the slit while it is in use. There was also a problem that the circular saw body part popped out.

In view of the conventional problems as described above, the present invention can effectively suppress the vibration generated in the outer peripheral portion of the circular saw body, and can significantly reduce the generation of metallic noise due to the vibration. It is an object of the present invention to provide a circular saw capable of preventing the circular saw body surrounded by the slit from protruding.

[0004]

[Means for Solving the Problems]

 In the circular saw 1 of the present invention which can achieve the above-mentioned object, a plurality of slits 4 extending in the circumferential direction and extending in the radial direction are formed on the outer peripheral portion of the circular saw body 2, and each slit 4 is discontinuous at a required position. The portions 5 and 6 are formed, and the opposing ends of the adjacent slits 4 and 4 are formed to face each other in the radial direction of the circular saw body 2 and to enter each other in the circumferential direction or extend to the vicinity of each other. The vibration damping material 7 is loaded in each of the slits 4.

[0005]

[Action]

 According to the present invention, each slit 4 extends in the radial direction while extending in the circumferential direction of the circular saw body 2, and the opposite ends of the slits 4, 4 adjacent in the circumferential direction are the radial direction of the circular saw body 2. Since the slits 4 are formed so as to face each other and extend in such a manner that they enter each other in the circumferential direction or extend to the vicinity of each other, the vibration generated in the outer peripheral portion of the circular saw body 2 during cutting is propagated in the circumferential direction by each slit 4. It is prevented from propagating to the inner peripheral side and stops on the outer peripheral part of the circular saw body 2 without expanding.

Therefore, the vibration at the outer peripheral portion of the circular saw body 2 is absorbed and attenuated by the vibration-proof material loaded in each slit 4, so that the metallic sound generated with the vibration is generated. Significantly reduced. Further, since the discontinuous portions 5 and 6 are formed at the required positions of each slit 4, each series of slits 4 is divided into a plurality of short slit portions, and the circular saw body 2 surrounded by each slit 4 is formed. The protrusion of the part is prevented.

[0007]

【Example】

 An embodiment will be described with reference to the drawings. FIG. 1 shows a circular saw 1 for cutting an iron material. For example, a steel saw circular saw body 2 having a diameter of 1120 mm and a thickness of 7 mm is provided on the outer peripheral edge of a saw blade with a tip. 3 is formed. On the outer peripheral portion of the circular saw body 2, a plurality of mountain-shaped slits 4 extending in the circumferential direction and extending in the radial direction are formed in the circumferential direction at the same pattern and at a constant pitch.

The slits 4 will be described in more detail. As shown in the drawing, each slit 4 has a slightly curved top portion 4a, and both ends of the top portion 4a. It is composed of two flow sections 4b and 4c that extend and form an arc. One (left side) flow section 4b has its skirt portion extending longer than the other flow section 4c, and is not formed in the middle of the top section 4a. A continuous portion 5 is formed, and a similar discontinuous portion 6 is formed on the hem side of the longer flow portion 4b. Each slit 4 is formed by laser processing so as to have a slit width of, for example, about 0.2 to 0.5 mm, and the discontinuous portions 5 and 6 are formed to be short, for example, about 2 to 3 mm in length. To be done.

A plurality of slits 4 are formed at a constant pitch in the circumferential direction of the circular saw body 2. The slits 4 and 4 adjoin each other, that is, the flow portion of one of the adjacent slits 4. The leading end of 4b and the leading end of the flow portion 4c in the other slit 4 are formed so as to face each other in the radial direction of the circular saw body 2 and extend to the vicinity where they enter each other in the circumferential direction. In this case, both of the above-mentioned tip portions may be formed so as to face each other in the radial direction of the circular saw body 2 and to enter each other in the circumferential direction.

Then, as shown in FIG. 2, a vibration isolator 7 is loaded in each of the slits 4. As the vibration isolator 7, a polymer having rubber elasticity such as various synthetic rubbers or semi-hard or soft synthetic resins is used.

Although this embodiment exemplifies a circular saw for cutting an iron material, in the case of a circular saw for cutting a non-ferrous material such as aluminum, the circular saw body 2 is radially inward from the outer peripheral end surface thereof. A notch 8 for absorbing thermal expansion, which extends as shown in phantom in FIG. 1, is formed.

When cutting is performed using the circular saw 1 having the above-described configuration, vibrations generated in the outer peripheral portion of the circular saw body 2 are propagated in the circumferential direction and directed to the inner peripheral side by the slits 4. Is prevented from propagating. That is, each slit 4 is formed in a mountain shape with a small curved top portion 4a and both flow portions 4b and 4c that extend from both ends of the top portion 4a in the circumferential direction and extend in the radial direction to form a gentle arc shape. The leading end of the flow portion 4b in one of the adjacent slits 4 and the leading end of the flow portion 4c in the other slit 4 oppose each other in the radial direction of the circular saw body 2 and extend to the vicinity where they enter each other in the circumferential direction. Therefore, the vibration at the outer peripheral portion of the circular saw body 2 is prevented from propagating to the inner peripheral side by the tops 4a of each slit 4, and propagated to the inner peripheral side and the circumferential direction by both the flow portions 4b and 4c. In addition, the opposite ends of the slits 4 and 4 adjacent to each other prevent the propagation from the slits 4 and 4 to the inner peripheral side.

Then, the vibration at the time of cutting will stop at the outer peripheral portion of the circular saw body 2 without expanding, but this vibration is caused by the energy-damping material 7 loaded in each slit 4. Is absorbed and attenuated, so that the metallic noise caused by vibration is significantly reduced, and the working environment is improved.

In addition, in each slit 4, discontinuous portions 5 and 6 are formed on the central portion of the top portion 4a and on the mountain hem side of the one flow portion 4b, and each series of slits 4 has a plurality of short slit portions. Since the circular saw body 2 surrounded by each slit 4 is effectively prevented from popping out, the load on the circular saw body 2 is reduced, and the life of the circular saw 1, especially the saw tooth tip, is reduced. And the cutting accuracy is improved.

Further, since each one of the mountain-shaped slits 4 is formed so that the mountain hem portion of one of the flow portions 4b is longer than the other flow portion 4c at least in the circumferential direction, the circular saw body 2 corresponds to the lengthened portion. The number of slits 4 provided on the outer peripheral portion can be reduced.

It should be noted that each slit 4 is not limited to a mountain shape, and various modifications can be made. Further, one or more discontinuous portions of each slit 4 can be formed arbitrarily.

[0017]

[Effect of device]

 According to the circular saw of the present invention, each slit extends in the circumferential direction of the circular saw body while also extending in the radial direction, and the opposing ends of the adjacent slits face each other in the radial direction and enter each other in the circumferential direction. The vibrations generated at the outer peripheral portion of the circular saw body at the time of cutting are prevented from propagating in the circumferential direction and to the inner peripheral portion side, and further, each slit 4 is formed. Energy is absorbed and attenuated by the anti-vibration material loaded inside, so the metallic noise generated by vibration is greatly reduced compared to the conventional circular saw, and the working environment is extremely good. You can

In addition, since a discontinuous portion is formed at a required position of each slit and each series of slits is divided into a plurality of short slit portions, it is effective to project the circular saw body portion surrounded by each slit. Therefore, the load on the circular saw body can be reduced, the life of the saw tooth tip can be greatly extended, and the cutting accuracy can be significantly improved.

Further, when each slit is formed in a mountain shape, vibration is transmitted from the outer peripheral part of the circular circular saw body to the inner peripheral part by both flow parts extending in the circumferential direction and the radial direction from the top of the mountain shape. Can be blocked more effectively. The appearance is also good.

[Submission date] December 13, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

Further, when each slit is formed in a mountain shape, vibration is propagated from the outer peripheral portion of the circular saw body to the inner peripheral portion by both flow portions extending in the circumferential direction and the radial direction from the top portion of the mountain shape. It can be blocked more effectively. The appearance is also good.

[Brief description of drawings]

FIG. 1 is a partial side view of a circular saw according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Circular Saw 2 Circular Saw Main Body 3 Sawtooth 4 Slit 4a Top of Mountain Slit 4b Mountain Stream Slit 4c Mountain Slit Stream 5 Discontinuity 6 Discontinuity 7 Vibration Isolator

Claims (2)

[Scope of utility model registration request] 1. A circular saw body is provided with a plurality of slits extending in a circumferential direction and a radial direction on an outer peripheral portion of the circular saw body. Each slit has a discontinuous portion formed at a required position, and an opposing end of an adjacent slit. A circular saw in which the portions are formed so as to face each other in the radial direction of the circular saw body and extend in such a manner that they enter each other in the circumferential direction or extend to the vicinity of each other, and each of the slits is loaded with a vibration isolator. 2. The circular saw according to claim 1, wherein each slit is formed in a mountain shape.