JPS61185405A - Circular saw edge - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention is a circular saw board with a tip formed of a cemented carbide material fixed to the peripheral edge thereof by brazing so that cutting materials such as wood can be cut with good sharpness. This relates to a circular saw blade made of

1. For circular saws like the one shown in Fig.
1, a motor 12 provided in the casing 11, a circular saw blade 14 attached to the rotational drive shaft of the motor 12 with a circular saw blade attachment washer 4-13, etc.
A circular saw blade 14 is rotated by rotation of a motor 12, so that a cutting material 15 such as wood can be cut.

A tip 5 made of a cemented carbide material is bonded to the tip of the circular saw blade 14 by brazing or the like so that the cutting material 15 can be easily cut. That is, as shown in FIG. 6(a), a plurality of circular saw pedestals 1 are provided around the circular saw blade 14 to protrude outward, and a circular saw blade is provided at the side end of the circular saw pedestal 1 in the direction of rotation. Lateral surface 2 substantially perpendicular to the radial direction of 14
A notch 4 is formed, and the chip 5 is fixed to the notch 4 by brazing. Conventionally, the tip 5 is joined to the circular saw pedestal 1 by the bottom joint surface 6b of the chip 5 and the side joint surface 6a of the chip 5, and the circular saw blade 14
The contact of tip 5 with respect to the force in the l1lFI direction of 4! ? −
The strength was received by the side joint surfaces 6a, and the joint strength against the radial force of the circular saw blade 14 was received by the bottom joint surface 6b. However, since the conventional brazing surface where the circular saw pedestal 1 and the tip 5 are joined is a straight surface as described above, the brazing strength is insufficient.
Therefore, when a radial impact force P acts on the circular saw blade 14 due to a fall of the circular saw, the tip 5 itself is made of cemented carbide and is hard, so it will not chip, but as shown in FIG. 6(b), The component force Pl of the impact force P is set as the support Aky of the notch 4 and α.

P2 occurs, the chip 5 rotates and the joints 6b, 6
It had the disadvantage that it could be peeled off from a. If this happens, the entire tip 5 will peel off, causing a sudden change in cutting resistance, and a large load will be applied to the tip 5 immediately behind, causing this tip 5 to chip as well. A problem occurred in that the cutting ability of the tip 14 was greatly reduced, and if the entire relatively large tip 5 was torn off during high-speed rotation, the tip 5 would scatter to the surroundings, which was very dangerous.

1. Purpose of the Invention] The present invention has been made in view of the above points, and it is possible to improve the safety of a circular saw by eliminating the scattering of chips during cutting, and to rapidly increase the cutting ability. It is an object of the present invention to provide a circular saw blade that can be prevented from deteriorating.

[Disclosure of the Invention] That is, the specific invention of the circular saw blade according to the present invention is such that the circular saw pedestal 1 is protruded from the outer periphery of the circular saw base 18, and the tip 5 is fixed to the tip of the circular saw pedestal 1 by brazing. , is characterized by forming a notch 7 at the base of the circular saw pedestal 1. By providing the notch 1 at the base of the circular saw pedestal 1, when an impact force is applied to the tip 5, The circular saw pedestal 1 is deformed to absorb the impact force, and the combined invention of the present invention is to provide the circular saw pedestal 1 protrudingly on the outer periphery of the circular saw base 18 and to attach the chip 5 to the circular saw pedestal 1. This chip is fixed by brazing and has a notch 8 formed at the tip of the chip 5, so that the impact force applied to the chip 5 is absorbed by the chip 5 itself, which is damaged at the notch 8. The above object is achieved by preventing the entire tip 5 from falling off the circular saw pedestal 1.

The present invention will be described in detail below based on examples. The circular saw blade 14 has a plurality of circular saw bases 1 protruding outward at regular intervals around a circular saw base plate 18, and a cutting tip 5 formed of a cemented carbide material at the tip of the circular saw base 1. It is fixed by brazing. As shown in FIG. 1, at the end of the tip of the circular saw pedestal 1 on the rotation direction side, there is a lateral surface 2 that is substantially perpendicular to the radial direction of the circular saw pedestal 1, and a lateral surface 2 that substantially intersects with this lateral surface 2. A notch 4 is formed with the vertical surface 3. Furthermore, a notch 7 is formed at the base of the circular saw pedestal 1 in the circumferential direction of the circular saw blade. This notch 7 may be formed with a notch 7a that is cut out to approximately half the width W of the circular saw pedestal 1 so as to open toward the rotation direction side of the circular saw pedestal 1 as shown in the figure, or a notch 7a that is cut out to approximately half the width W of the circular saw pedestal 1 may be formed. Notch portion 7b that is cut out by approximately half of the width W of circular saw pedestal 1 so as to open on the side opposite to the rotational direction of pedestal 1.
It may be formed by Or, as shown in the figure, circular saw script 1σ)
1. A! 61+2. )21- may be done. Chip 5 is 2
It is formed into a substantially prismatic shape from a cemented carbide material having a melting point of 000°C or more, and has a sharp cutting surface 9 having a cutting edge angle θ at the tip.
is provided. This chip 5 is brazed to the notch 4 of the circular saw base 1 with a brazing material 22 such as silver solder (an alloy of silver and copper). Chip 5 as shown in Figure 1(b)
is preferably joined to the notch 4 of the circular saw pedestal 1 at a position that is slightly offset in the thickness direction of the circular saw pedestal 1.

Therefore, by brazing and fixing the tip 5 to the notch 4 provided at the tip of the circular saw pedestal 1, and by providing the above-mentioned notch 7 at the base of the circular saw pedestal 1, the impact force applied to the tip 5 is reduced. This can be absorbed by the elastic deformation of the circular saw pedestal 1, and can prevent the chip 5 from peeling off from the notch 4 of the circular saw pedestal 1. That is, the base of the circular saw pedestal 1 has a narrow width due to the notch 7, and is therefore easily deformed by external forces. This can reduce the impact force applied to the chip 5 and prevent the chip 5 from peeling off from the circular saw base 1. In particular, by forming the notch 7 to be long in the circumferential direction of the circular saw blade 14, the tip of the circular saw pedestal 1 can be deformed in the radial direction by the impact force P applied to the radial direction of the circular saw blade 14. The impact force of the chip 5 can be effectively absorbed. Therefore, unlike the conventional method, the tip 5 does not peel off and the cutting force suddenly becomes insufficient, and other tips 5 are not adversely affected, so there is no reduction in cutting ability. There will be no more scattering, and you can work safely.

Note that FIGS. 2 to 4 show embodiments of the merged invention according to the present invention. In this embodiment, a notch 8 is provided at the tip of the tip 5 to absorb the impact force P applied to the tip 5 when the tip of the tip 5 is chipped. That is, in FIG. 2, a notch 8 is formed on the side surface of the tip 5 in the rotational direction, the notch 8 having a semicircular side surface and passing through the circular saw base 1 in the thickness direction. In this embodiment, the notch 8 of the tip 5 can absorb a certain amount of impact force, and if the impact force cannot be withstood, the tip 5 will chip from the notch 8 at the tip of the tip 5. , it is possible to prevent the entire tip 5 from chipping away from the brazed portion of the circular saw base 1. In this case, the cutting surface 9, which is very important for cutting, will be chipped.
Even after chipping, a portion of the cutting surface 9 of the tip 5 remains, so although the sharpness is somewhat inferior, the cutting ability is not significantly reduced. Therefore, compared to the case where the entire tip 5 separates from the circular saw pedestal 1 as in the conventional case, there is no sudden lack of cutting ability, and there is less influence on the tip 5 at the rear of the rotation, which causes a sudden drop in cutting ability. There is no such thing. On the other hand, since the chips 5 are less likely to chip, the chips 5 are less likely to scatter and the danger is reduced. The notch 8 may be provided on the cutting surface 9 of the tip 5 as shown in FIG. 3, or on both the cutting surface 9 of the tip 5 and the side surface of the tip 5 as shown in FIG. Also good.

[Effects of the Invention 1 As described above, the specific invention of the present invention provides a circular saw base protruding from the outer periphery of the circular saw base, a chip fixed to the tip of the circular saw base by brazing, and a circular saw base protruding from the base of the circular saw base. Since the notch is formed, the base of the circular saw pedestal can easily deform elastically, and the impact force applied to the chip can be absorbed by the deformation of the circular saw pedestal. This eliminates the risk of the chip peeling off from the blade and scattering around, and also eliminates the loss of sharpness due to the chip falling off and the negative impact on other chips, and prevents a significant drop in cutting resistance. . In addition, in the combined invention of the present invention, since the notch is formed in the chip, the impact force applied to the chip is absorbed by the chip itself chipping at the notch.
It can prevent the entire chip from falling off the circular saw pedestal, and there is no danger of the entire chip coming off from the circular saw blade and scattering around during cutting. It is something that can be prevented.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are a front view and a side view of a main part of a circular saw pedestal of an embodiment of the specific invention of the present invention, and FIG.
b) is an explanatory diagram of an embodiment of the merged invention of the present invention, FIG.
a) (b) are explanatory diagrams of other embodiments of the same as above, FIG. 4 (a)
(b) is an explanatory diagram of still another embodiment of the same as above, and FIG.
)(b) is an overall perspective view of a circular saw and a front view of a circular saw blade, and FIGS. 6(a) and 6(b) are explanatory views of a conventional example. 1 is a circular saw base, 4 is a notch, 5 is a chip, 7 and 8 are notches, and 18 is a circular saw substrate.

Claims (2)

[Claims] (1) A circular saw pedestal is provided protruding from the outer periphery of a circular saw board, a chip is fixed to the tip of the circular saw pedestal by brazing, and a notch is formed at the base of the circular saw pedestal. Saw blade. (2) A circular saw blade characterized in that a circular saw pedestal is provided protruding from the outer periphery of a circular saw substrate, a chip is fixed to the circular saw pedestal by brazing, and a notch is formed in the chip.