JPH11146720A - Chip saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chip saw as a bush cutter blade firmly brazed with many cemented carbide chins along the outer circumference of a disc-shaped blade plate, designed to prevent the chips from scattering far away in the direction of the outer circumference. SOLUTION: This chip saw is composed of a blade plate 2 provided with saw-tooth parts 3 along the outer circumference and with notches on the side corners in the direction of its rotation and cemented carbide chips 6 each with a gutter groove 5 having arc-shaped section of the portion jointing to the notch; wherein catch of the gutter grooves 5 is brazed so as to run fitted with the edge 7 of the notch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a tip saw used for a power type brush cutter, a power type cutting machine, and the like.

[0002]

2. Description of the Related Art As shown in FIG. 1, a power-type mower used for mowing work or the like is provided with a rotary output of a power motor 18 at a flange portion at a distal end thereof through a shaft disposed inside a rod 19. The blade is attached by screwing the center of the blade to the lower surface of the flange, but such a brush cutter has the following features: In many cases, a tip saw having a number of carbide tips 21 attached to the outer peripheral portion of a circular metal blade plate 20 is used.

[0003]

In the case of mowing using a brush cutter, during the operation, the tip of the carbide tip frequently comes into contact with a stone rolling on the ground, In order to prevent the cemented carbide tip from falling off the blade plate due to the strong impact constantly applied to the cemented carbide part, in the case of recent ones, the cemented carbide tip was formed on the blade plate. It is common to have a configuration in which brazing is performed in a state inserted into the notched concave portion.

[0004] However, in the case where a notch recess is formed in the blade plate and brazing is performed in a state where a carbide tip is inserted into the recess, a brazing to the joint portion between the carbide tip and the blade plate is performed. There is a drawback that the area around is not uniform, the fatigue is promoted from a part having a poor adhesive strength, and the chip flies in a short period of time.

[0005] The present invention is to solve such a problem in the conventional configuration.

[0006]

According to the present invention, there is provided a blade plate in which a saw blade is formed on an outer peripheral portion and a notch recess is formed in a corner portion in the rotation direction, and a cross-sectional shape of a portion to be joined to the notch recess is formed. It consists of a carbide tip having an arc-shaped gutter groove, and brazing is performed so that the gutter groove formed in the carbide tip is fitted to the edge of the cut recess, so that each part is The purpose of the present invention is to make the brazing strength uniform and prevent chips from flying during the work.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 2 to 7, a tip saw 1 has a circular blade having a hole 22 for attachment to a brush cutter at the center. Are formed on the outer periphery of the plate 2 and an edge 7 consisting of three sides is formed at each corner of the tip.
And a hard tip 6 having a gutter groove 5 having a circular arc-shaped cross section at a portion joined to the edge 7 of the notch 4. It has a schematic configuration in which brazing is performed so that each formed gutter groove 5 is fitted to the edge 7 of the cutout 4.

That is, the blade plate 2 has a sawtooth portion 3.
.. is formed of a disc-shaped metal plate having a width capable of fitting the base of the cemented carbide tip 6 at the corner in the rotation direction of the sawtooth portion 3 and having a depth of cemented carbide. A configuration in which a notch 4 having an edge portion 7 composed of three sides that is shallower than the height of the tip 6 and whose tip projects from the tip of the sawtooth portion 3 when the cemented carbide tip 6 is fitted is formed. It is.

On the other hand, as shown in FIGS. 2 to 7, the cemented carbide tip 6 extends along the edge 7 of the cut portion 4 formed in the blade plate 2 and has a cross-section at a portion to be joined to the edge 7. A gutter groove 5 having an arc shape is formed. When the cemented carbide tip 6 is fitted into the cutout 4, the tip of the cemented carbide tip 6 is the tip of the saw tooth portion 3 of the blade plate 2. It is formed so as to protrude toward the outer peripheral side from the portion.

An outer portion of the cemented carbide tip 6 (a portion protruding from the outer periphery of the sawtooth portion 3) is formed with a mountain-shaped portion 8 having a sharp pointed top, and a corner in the rotation direction. The portion is formed with a concave portion 9 cut out in an arc shape, and therefore, the blade tip portion is formed in a rake blade shape.

In the above description, the tip of the cemented carbide tip 6 has a mountain-shaped rake blade shape. Another embodiment of the cemented carbide tip 6 has a structure as shown in FIGS. Is possible.

FIG. 8 to FIG. 11 show that a flat portion 11 which is perpendicular to the side surface portion 10 is formed on the outer portion of the carbide tip 6.

FIGS. 12 to 15 show that a flat portion 13 which is perpendicular to the side surface portion 12 is formed on the outer portion of the cemented carbide tip 6 and that the corner portion on the rotation direction side is cut out in an arc shape. The recess 14 is formed.

FIG. 16 to FIG. 19 show a case where a corner drop portion 15 having a round cross section is formed on the outer portion of the cemented carbide tip 6, and a concave portion cut out in an arc shape is formed in a corner portion on the rotation direction side. 16 is formed.

FIGS. 20 to 23 show a case where a corner drop portion 17 having a round cross section is formed on the outer portion of the cemented carbide tip 6.

The configuration of the blade plate 2 and the cemented carbide tip 6 that constitute the tip saw 1 is as described above. When the cemented carbide tip 6 is attached to the blade plate 2, the edge 7 of the cut portion 4 is formed. Then, after the gutter groove 5 formed on the base side of the hard tip 6 is arranged so as to be in a fitted state, the soldering is performed between the gutter groove 5 of the carbide tip 6 and the edge 7 of the cut portion 4. It is performed by letting in.

[0017]

The tip saw 1 according to the present invention has the above-described structure, and can prevent the carbide tip from flying from the blade plate due to an impact applied during use, thereby improving the durability of the blade itself. There is an advantage that.

That is, as in the case of the conventional configuration, when a notch recess is formed in the blade plate and the base of the carbide tip is inserted and brazed and fixed there, the periphery of the brazing to the joining portion is made uniform. However, there is a drawback that the fatigue is promoted from a portion having a weak adhesive strength and the chip is blown out in a short time. However, in the tip saw according to the present invention, the cemented carbide tip 6 and the cut portion 4 Is a gutter-shaped groove whose cross-sectional shape is an arc, so that during brazing, the brazing flows smoothly into the bottom of the gutter-shaped groove, and the brazing strength becomes uniform, This means that the chips can be prevented from flying.

Regarding the shape of the outer portion of the cemented carbide tip 6, when the tip is formed in a mountain shape with a sharp peak and a concave portion cut in an arc shape is formed in a corner on the rotation direction side, When the tip becomes sharp, the sharpness can be improved, and when the outer portion is made flat or angled, the sharpness is somewhat reduced, but the impact at the time of contact with stones etc. becomes strong, and the tip shape With this change, it is possible to provide a tip saw that is suitable for the application.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a tip saw is attached to a power-type mower.

FIG. 2 is a front view showing the entire tip saw according to the present invention.

FIG. 3 is a partially enlarged view of the tip saw according to the present invention.

FIG. 4 is a longitudinal sectional view showing a configuration of a carbide tip.

FIG. 5 is a side view showing a configuration of a carbide tip.

FIG. 6 is a partially enlarged perspective view showing a configuration of a blade plate and a carbide tip.

FIG. 7 is a partially enlarged perspective view showing an attached state of a carbide tip.

FIG. 8 is a longitudinal sectional view showing another embodiment of the carbide tip.

FIG. 9 is a side view showing another embodiment of the carbide tip.

FIG. 10 is a partially enlarged perspective view showing a configuration of a cemented carbide tip of another embodiment.

FIG. 11 is a partially enlarged perspective view showing an attached state of a carbide tip of another embodiment.

FIG. 12 is a longitudinal sectional view showing another embodiment of the carbide tip.

FIG. 13 is a side view showing another embodiment of the carbide tip.

FIG. 14 is a partially enlarged perspective view showing the configuration of a cemented carbide tip according to another embodiment.

FIG. 15 is a partially enlarged perspective view showing an attached state of a carbide tip according to another embodiment.

FIG. 16 is a longitudinal sectional view showing another embodiment of the carbide tip.

FIG. 17 is a side view showing another embodiment of the carbide tip.

FIG. 18 is a partially enlarged perspective view showing the configuration of a cemented carbide tip according to another embodiment.

FIG. 19 is a partially enlarged perspective view showing an attached state of a carbide tip of another embodiment.

FIG. 20 is a longitudinal sectional view showing another embodiment of the carbide tip.

FIG. 21 is a side view showing another embodiment of the carbide tip.

FIG. 22 is a partially enlarged perspective view showing a configuration of a cemented carbide tip of another embodiment.

FIG. 23 is a partially enlarged perspective view showing an attached state of a carbide tip according to another embodiment.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Tip saw 2 Blade plate 3 Saw tooth part 4 Notch part 5 Gutter groove 6 Carbide tip 7 Edge part 8 Angle part 10 Side part 11 Flat part 12 Side part 13 Flat part 14 Depression 15 Corner drop part 16 Depression 17 Corner drop part

Claims (6)

[Claims] 1. A saw tooth portion 3 is formed on an outer peripheral portion.
Blade plate 2 having a cutout 4 formed at the corner in the rotation direction
And a cemented carbide tip 6 having a gutter groove 5 having a circular arc-shaped cross section at a portion joined to the notch 4. The gutter groove 5 formed in the cemented carbide tip 6 is formed on the edge 7 of the notch 4. A tip saw characterized by being brazed so as to be in a fitted state. 2. An arc-shaped notch 9 is formed in a corner portion on the rotation direction side at a corner on the rotation direction side, while a mountain portion 8 having a sharp apex is formed on the outer portion of the carbide tip 6. Carbide tip saw. 3. The carbide tip saw according to claim 1, wherein a flat portion 11 that is perpendicular to the side surface portion 10 is formed on an outer portion of the carbide tip 6. 4. A flat portion 13 perpendicular to the side surface portion 12 is formed on an outer portion of the cemented carbide tip 6, and a concave portion 14 cut out in an arc shape is formed on a corner portion on the rotation direction side. The cemented carbide tip saw according to claim 1. 5. A method according to claim 1, wherein a corner drop portion having a round cross-sectional shape is formed on an outer portion of the carbide tip, and a concave portion cut out in an arc shape is formed on a corner portion on a rotation direction side. Item 4. A carbide tip saw according to Item 1. 6. The carbide tip saw according to claim 1, wherein a corner drop portion 17 having a round cross section is formed on an outer portion of the carbide tip 6.