JP3030705B2 - Circular saw - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular saw used for cutting or grooving a metal material, wood, a synthetic resin material, or a composite material thereof.

[0002]

2. Description of the Related Art Conventionally, a circular saw of this type has a required number of blades formed at regular intervals on an outer peripheral edge of a disk-shaped base metal. Is generally widely used. However, in such a conventional circular saw, vibration is very easily excited because the repetition of impact at the time of cutting is at regular intervals, and thus not only the cutting sound becomes high but also a periodic so-called undulating pattern on the cut surface. Have the disadvantage that they are liable to occur.

In order to solve the problems of the above-mentioned conventional example, a circular saw configured to appropriately arrange a required number of blade groups having blades having different pitches, a blade group having a coarse pitch on an outer peripheral edge of a base metal , or the like. Circular saw configured to alternately dispose blades and fine pitch blades (see Japanese Utility Model Application Laid-Open No. 64-41222).
Has been proposed. However, in the conventional circular saw configured as described above, the number of blades simultaneously acting on a required work material (the number of knuckle blades) extremely fluctuates, so that the cutting power fluctuates. The maximum required power may be excessive. Moreover, since the number of blades of one group to be repeated is determined, the relationship with the number of blades of the entire circular saw cannot be freely designed.

Further, a circular saw configured to dispose blades having different pitches at predetermined intervals, or a blade having a required height is formed on an outer peripheral edge of a base metal. Circular saw (low-profile flat 1-1) in which a low blade-shaped blade is provided
No. 49217) has been proposed. However, in such a conventional circular saw, blades having different pitches or low blade-shaped blades are arranged at predetermined intervals, so that the number of blades for engagement or the cutting power periodically changes to cause intermittent vibration. It has a drawback that it can occur.

SUMMARY OF THE INVENTION The present invention is intended to solve the conventional problems at a glance, and it is possible to reduce excessive vibration and power fluctuation due to a periodic impact force and to improve flatness of a cut surface. Another object of the present invention is to provide a circular saw capable of reducing cutting noise.

[0006]

That is, the present invention relates to a circular saw in which a required number of blades are formed on an outer peripheral edge of a disk-shaped base metal, wherein pitches between the respective blades are all irregular. And each pitch is ± 5 to 25% with respect to the pitch of a circular saw having the same number of blades formed at the same pitch.
The gist is that the total pitch amount between consecutive three to six blades is within ± 10%.

[0007]

The pitch of all the blades constituting the circular saw is formed irregularly and irregularly.
Since the total pitch amount between the blades is configured to slightly fluctuate over the entire circumference, it is possible to reduce vibration and excessive power due to periodic impact.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, in which 31 is a disk-shaped metal base, 32 is a mounting hole formed in the center of the base 31, and 33 is a base. Money 3
Each of the blades 33 includes 48 blades protruding from the outer peripheral edge of
Are arranged so that the pitches between the blades are all different and are arranged irregularly. Each pitch between the blades is set within a range of ± 5 to 25% with respect to a circular saw pitch in which 48 blades are regularly formed at the same pitch, and 3 to 6 continuous blades are formed. The total pitch between them is set to ± 10%. When the pitch between the blades 33 is ± 5% or less, the pitch becomes substantially equal and the unequal pitch effect disappears. Conversely, when the pitch exceeds 25%,
Not only does the pitch become too large to make it easier to swing,
This makes it difficult to store and discharge chips, making it impossible to perform reliable cutting. When the total pitch between 3 to 6 blades is ± 10% or less, the unequal pitch effect disappears. When the total pitch exceeds ± 10%, not only the swing becomes easy, but also the storage of chips. -As described above, it becomes difficult to discharge.

FIG. 2 shows a second embodiment of the present invention, in which a base metal 41 is formed to have a slightly larger diameter, and the outer periphery of the base metal 41 is 44 sheets under the same conditions as in the first embodiment. Is different from the first reference in that the blade 43 is formed, and the other parts are the same.
The same reference numerals indicate the same parts.

The first and second embodiments constructed as described above may be set on a required machine and cut or grooved a required work material such as a metal material or wood by a conventional method. . At the time of such cutting or grooving, the pitches of all the blades 33 and 43 constituting the circular saw are formed irregularly and irregularly, and the circular saw having the blades formed at the same pitch has a 3 pitch. Since the total pitch amount between the six blades fluctuates slightly over the entire circumference, it is possible to significantly reduce excessive vibration and power fluctuation due to a periodic impact force.

The first and second embodiments are used to cut a 140.times.140 mm square member at a rotational speed of 48 rpm and a 110.times.110 mm square member at a rotational speed of 62 rpm, respectively. ) And cutting sound (dB) were measured. Table 1 shows the results. Circular saws having the same number of blades formed at the same pitch as those of the first and second embodiments are referred to as first and second comparative examples, respectively, and 140 × under the same conditions as those of the first and second embodiments.
A 140 mm square member and a 110 × 110 mm square member are cut, and the vibration level displacement (mm) and the cutting sound (d)
B) was measured, and the results are shown in Table 1.

[0012]

[Table 1]

As is clear from Table 1, the vibration level displacement (mm) and the cutting sound (dB) are significantly lower in both the first and second examples than in the comparative examples 1 and 2. It can be understood that excessive vibration and power fluctuation are significantly reduced.

In the first and second embodiments, the number of the blades 33 and 43 is 48 and 44, respectively. However, the present invention is not limited to this. It is something that can be done.

[0015]

According to the present invention, as described above, the pitches between the blades constituting the circular saw are all irregularly and irregularly formed, and the same number of blades are formed at the same pitch. ± 5 to 25% of the pitch of the circular saw, and the total pitch between consecutive 3 to 6 blades is within ± 10%. Excessive vibration and power fluctuation due to periodic impact force. Not only can be reduced and the flatness of the cut surface can be improved, but also the cutting noise can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a plan view showing a second embodiment of the present invention.

[Explanation of symbols]

 31 base metal 33 blade 41 base metal 43 blade

Claims (1)

(57) [Claims] In a circular saw in which a required number of blades are formed on an outer peripheral edge of a disk-shaped base metal, pitches between the respective blades are all irregularly and irregularly formed. The pitch is ± 5 to 25% of the pitch of a circular saw with the same number of blades formed at the same pitch, and the total pitch between consecutive 3 to 6 blades is within ± 10%. And circular saw.