JP2004009218A - Rotary saw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a noise in idling, while a heat release effect in cutting is made high. <P>SOLUTION: In the rotary saw in which a large number of teeth (12) are provided on an outer periphery of a disc-like base metal (11) and long holes (13) for preventing thermal deformation approximately radially extending are formed on an inner peripheral part of the base metal (11), the long holes (13) are made to approximately 6mm in a width of a short length direction. An end part long hole (13b) extending approximately perpendicular to a long hole main body (13a) is continuously provided on at least one end of the long hole main body (13a) approximately radially extending. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotary saw for cutting wood, steel, and the like.
[0002]
[Prior art]
FIG. 6 shows a conventional technique. In FIG. 6, reference numeral 1 denotes a rotary saw having an outer diameter of about 355 mm, and about 40 saw-tooth blade bases 3 are formed on the outer periphery of a base metal 2 having a thickness of about 2 mm. Carbide tip 4 is fixed to the side. Four long holes 5 for preventing thermal deformation are formed in the inner peripheral portion of the base 3 at equal pitches in the circumferential direction. Both of the long holes 5 are formed in an elliptical shape elongated in the radial direction. That is, it is formed in an elongated elliptical shape in which the radius R1 of the outer peripheral end is about 10 mm, the radius R2 of the inner peripheral end is about 4 mm, and the length L1 in the radial direction is about 45 mm. Slits 6 are formed at four locations on the outer periphery of the base metal 2. The slit 6 is formed so as to have a groove width of about 1.2 mm from the tooth bottom of the tooth located in the circumferential middle of each of the long holes 5 and to have a depth of about 22 mm in the axial direction.
[0003]
[Problems to be solved by the invention]
In the above-mentioned conventional device, when the base metal 2 thermally expands due to heat generated during cutting, the thermal expansion is absorbed by the long holes 5 and the slits 6 and the base metal 2 is prevented from being thermally deformed. . However, in the above-described conventional apparatus, a wind noise is generated in each of the five slots at the time of idling, and noise is generated at the time of idling. SUMMARY OF THE INVENTION It is an object of the present invention to obtain a novel rotary saw that reduces the noise at the time of idling and increases the circumferential length of each long hole to enhance the heat radiation effect at each long hole.
[0004]
[Means for Solving the Problems]
The present invention is configured as follows to achieve the above object. That is, according to the first aspect of the present invention, there is provided a rotation in which a large number of teeth are provided on the outer periphery of a disk-shaped base metal, and a long hole for preventing thermal deformation is formed in the inner circumference of the base metal to extend substantially in the radial direction. In the saw, the long hole has a width in the short direction up to about 6 mm, and has at least one end of a long hole main body extending substantially in the radial direction and an end long hole extending in a direction substantially orthogonal to the long hole main body. This is a configuration in which
Further, in the invention according to claim 2, the length of the end portion long hole is set to 2 to 5 times the width of the long hole main body.
According to a third aspect of the present invention, an intermediate elongated hole extending in a direction substantially perpendicular to the longitudinally intermediate portion of the elongated hole main body is provided continuously.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, FIG. 1 is a side view of a rotary saw showing a first embodiment of the present invention, FIG. 2 is a partial side view in which a main part of FIG. 1 is enlarged, FIG. FIG. 4 is a partial side view of a rotary saw showing a second embodiment of the present invention, and FIG. 5 is a partial side view of a rotary saw showing a third embodiment of the present invention.
[0006]
In FIG. 1, reference numeral 10 denotes a rotary saw having an outer diameter of, for example, about 355 mm, and has about 40 teeth 12 on the outer circumference of a base metal 11 having a thickness of about 2 mm. Four elongated holes 13 for preventing thermal deformation are provided on the inner peripheral portion of the base metal 11, and four slits 15 are provided on the outer peripheral portion of the base metal 11 alternately at predetermined intervals in the circumferential direction. It is formed. The base metal 11 is formed of a steel plate material such as SAE1074, SKS-5, or SK-5, and the long hole 13 and the slit 15 are formed by pressing or laser processing.
[0007]
Each of the long holes 13 has the same shape and is elongated in the radial direction. That is, as shown in FIG. 2, a short outer end slot 13b and an inner end slot 13c extending in both sides (circumferential direction) are provided at both ends and a middle part in the longitudinal direction of the long hole main body 13a extending in the radial direction. And the intermediate slot 13d is formed continuously. The widths S1, S2, S3, and S4 of the elongated main body 13a, the end elongated holes 13b and 13c, and the intermediate elongated hole 13d in the end direction are all about 4 mm. The length L2 in the radial direction of the long hole main body 13a is about 45 mm, and the widths L3, L4 in the longitudinal direction (circumferential direction) of the outer end long hole 13b, the inner end long hole 13c, and the middle long hole 13d. L5 is 20 mm, 15 mm, and 10 mm, respectively.
[0008]
Here, according to an experiment, the widths S1 to S4 in the end direction are larger than the thickness T1 of the base metal as shown in FIG. 3, and the maximum width S1 (S1 to S4) is up to about 6 mm. To get good results. This is presumably because when the widths S1 to S4 are set to 6 mm or more, turbulence occurs in the long holes 13. Further, when the widths S1 to S4 are smaller than the thickness T1 of the base metal, the outside air does not flow smoothly in the long holes 13 at the time of cutting, and the heat radiation effect is reduced. Further, the widths L3, L4, and L5 in the longitudinal direction (circumferential direction) of each of the end long holes 13b, the end long holes 13c, and the intermediate long holes 13d are twice the width S1 of the long hole main body 13a in the short direction. Good results could be obtained by setting the range to ５5 times.
[0009]
The above-mentioned slit 15 is formed at a depth of about 22 mm in the axial direction from the root of the tooth 12 located at the intermediate portion in the circumferential direction of each of the long holes 13, and the groove width is about 1.2 mm. I have.
[0010]
FIG. 4 shows a second embodiment. In FIG. 4, reference numeral 11 denotes a base, and reference numerals 12 and 15 denote teeth and slits formed on the outer periphery thereof, which have substantially the same structure as that of the first embodiment described above. Reference numeral 13-1 denotes an I-shaped long hole formed in the inner periphery of the base metal between the slits 15, 15. That is, short outer end long holes 13b and inner end long holes 13c extending in both sides (circumferential direction) are continuously formed at both ends of the long hole main body 13a extending in the radial direction, and the first embodiment described above is performed. The example intermediate slot 13d is omitted. The width S1, S2, S3 in the end direction of each of the long hole main body 13a and each of the end long holes 13b, 13c is about 4 mm, and the radial length L2 of the long hole main body 13a is about 45 mm. The widths L3 and L4 in the longitudinal direction (circumferential direction) of the end slots 13b and 13c are 20 mm and 15 mm, respectively.
[0011]
FIG. 5 shows a third embodiment. In FIG. 5, reference numeral 11 denotes a base metal, and reference numerals 12 and 15 denote teeth and slits formed on the outer periphery thereof, which have substantially the same structure as that of the first embodiment described above. Reference numeral 13-2 denotes an inverted L-shaped long hole formed in the inner peripheral portion of the base between the slits 15, 15. That is, a short outer end long hole 13b 'extending toward one side (in the anti-rotation direction of the rotary saw 10) is formed on the outer peripheral end of the elongated hole main body 13a extending in the radial direction, and both sides (circles) are formed on the inner peripheral end. In this case, a short inner end elongated hole 13c extending in the circumferential direction) is formed continuously.
[0012]
The widths S1 and S2 in the end direction of the long hole main body 13a and the outer end long hole 13b 'are both about 4 mm, and the radial length L2 of the long hole main body 13a is about 45 mm and the outer end length is approximately 45 mm. The widths L3 and L4 in the longitudinal direction (circumferential direction) of the hole 13b 'and the inner end slot 13c are 20 mm and 15 mm, respectively. The outer end slot 13b 'may extend in the rotation direction of the rotary saw 10. Others are the same as the first embodiment.
[0013]
Although the above-described slots 13 (13-1, 13-2) are all formed on the circumference of the same diameter, they are formed by shifting the phase on a plurality of circumferences having different diameters. It may be. For example, a similar long hole may be formed on the inner circumferential side of each slit 15 at a position closer to the inner circumferential side than each of the long holes 13 (13-1, 13-2) described above. In addition, elongated holes 13, 13-1, and 13-2 having different shapes may be mixed. In this case, they are mixed so that the rotational balance is not deviated. Further, the direction of each long hole 13 (13-1, 13-2) may be made to cross at a slight angle with respect to the radius line.
[0014]
【The invention's effect】
As is apparent from the above description, the present invention, when forming a long hole for preventing thermal deformation extending substantially in the radial direction in the inner peripheral portion of the base metal, the width of the long hole in the short direction to about 6 mm. In addition, since at least one end of the main body of the long hole is provided with an end long hole extending in a direction substantially orthogonal to the long hole main body, heat deformation of the base metal due to heat generated at the time of cutting is prevented, and Noise can be reduced.
In addition, the perimeter of the long hole becomes longer, the heat radiation effect is enhanced, and the heat generated during cutting can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view of a rotary saw showing a first embodiment of the present invention.
FIG. 2 is an enlarged partial side view of a main part of FIG.
FIG. 3 is an enlarged sectional view taken along the line III-III of FIG. 1;
FIG. 4 is a partial side view of a rotary saw showing a second embodiment of the present invention.
FIG. 5 is a partial side view of a rotary saw showing a third embodiment of the present invention.
FIG. 6 is a side view of a rotary saw showing a conventional example.
[Explanation of symbols]
Reference Signs List 10 Rotating saw 11 Base metal 12 Teeth 13 (13-1, 13-2) Slot 13a Slot main body 13b (13b ') Outer end slot 13c Inner end slot 13d Intermediate slot 15 Slit

Claims (3)

A large number of teeth (12) are provided on the outer periphery of the disk-shaped base (11), and a long hole (13) for preventing thermal deformation is formed in the inner circumference of the base (11) to extend substantially in the radial direction. In this rotary saw, the long hole (13) has a width in the short direction of up to about 6 mm and is substantially orthogonal to at least one end of the long hole main body (13a) extending substantially in the radial direction. A rotary saw comprising a series of end slots (13b) extending in the direction. 2. The rotary saw according to claim 1, wherein the length of the end slot (13b) is 2 to 5 times the width of the main slot (13a). The rotary saw according to claim 1 or 2, wherein an intermediate elongated hole (13d) extending in a direction substantially perpendicular to the longitudinally intermediate portion of the elongated hole main body (13a) is continuously provided.

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