JPH06344221A - Tipped saw, its manufacturing method and its device - Google Patents

Abstract

(57) [Summary] [Purpose] A tip saw that can prevent the tip from falling out of the recess and work efficiency such as brazing the tip in the recess can be improved, and a tip saw of stable quality can be obtained.
A method for manufacturing a tip saw and an apparatus therefor are provided. [Structure] The tip saw is provided with a recess formed on the peripheral edge of a circular saw material, the center side of which is wider than the peripheral edge, and the tip of which the base end side is wider than the tip side is brazed to this recess. Fix it. In this method of manufacturing a saw, the tip is set in the recess, the circular saw material is placed in a horizontal state, flux is applied to the fitting portion between the tip and the recess, and then the portion is induction-heated to recess the tip. Braze in place.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip saw in which a tip is brazed and fixed in a concave portion of a peripheral edge of a circular saw material, a method of manufacturing the tip saw, and an apparatus thereof.

[0002]

2. Description of the Related Art Conventionally, as a tip saw for a brush cutter used for mowing, for example, one disclosed in Japanese Utility Model Publication No. 3-23055 is known. This tip saw has a circular hole in the periphery of a disk-shaped circular saw material with a recessed hole, the opposite side surfaces of which are tapered outwardly, and both side surfaces of the tip taper at the same angle as the recessed part. The side surface of the recess and the side surface of the chip are fixed by brazing.

[0003]

However, with this tip saw, the tip easily falls off from the recess during use, and the work efficiency of brazing the tip into the recess is poor and stable. There was a problem that it was difficult to obtain a quality tip saw. That is, since the recess and the tip have a tapered shape that spreads outward, for example, if excessive force is applied to the tip during use due to stone or the like, if the brazing strength is insufficient, Can easily fall out of the recess.

Further, when the chips are brazed, if the circular saw material is placed in a horizontal state, the chips easily fall off from the tapered recesses during brazing, and thus the brazing is generally performed in a vertical state. And the brazing work is to set the tip in the recess, apply the flux, then braze, rotate the circular saw material, and braze the tip to the next recess in the same way. This is done over the entire circumference of the material. For this reason, it is necessary to perform each work in each of the recesses, and the work time for brazing one circular saw material becomes long, resulting in poor work efficiency. Also,
Since the circular saw material sets the chip in the recess in the vertical state,
The position where the chips are set easily varies in the plate thickness direction of the circular saw material, and it is difficult to obtain a stable quality.

The present invention has been made in view of the above circumstances, and a first object thereof is to provide a tip saw capable of preventing the tip from falling out of the recess, and a second object thereof. It is an object of the present invention to provide a method of manufacturing a tip saw and an apparatus therefor, which can improve work efficiency such as brazing of the tip to the concave portion and can obtain a tip saw of stable quality.

[0006]

In order to achieve the above object, the tip saw according to claim 1 is one in which a plurality of recesses are formed in the peripheral edge of a circular saw material, and the tips are brazed and fixed in the recesses. In the above, the recess is formed so that the center side is wider than the peripheral side, and the base end side of the chip is wider than the tip side. A tip saw according to a second aspect of the invention is characterized in that the recess and the tip are tapered in the plate thickness direction.

In the method of manufacturing a tip saw according to a third aspect of the present invention, a plurality of recesses are provided on the peripheral portion of the circular saw material, the center side of which is wider than the peripheral side, and the base end side is wider than the front end side. The formed chip was fitted from one surface side of the circular saw material in a horizontal state, the flux was applied to this fitting portion, and then the chip was placed on at least one surface side of the circular saw material. A high-frequency current is supplied to the heating coil to induction-heat the fitting portion, and the chip is brazed to the recess.

Further, in the tip saw manufacturing apparatus according to the fourth aspect of the present invention, the circular saw material is rotated by a motor on a horizontal plane, and has a circular saw material having a plurality of concave portions formed on the upper surface thereof so that the center side is wider than the peripheral side. A disk to be placed, a heating coil arranged near the peripheral edge of the circular saw material, an inverter for supplying a high frequency current to the heating coil, and a flux applying means for applying flux to the peripheral edge of the circular saw material. And a control means for controlling the motor and the inverter.

[0009]

According to the tip saw of the first aspect, the tip having the base end side wider than the tip end side is fixed to the concave portion formed with the center side wider than the peripheral side. The chip is prevented from coming off from the recess toward the peripheral side, and even if the brazing strength is poor, for example, the chip does not easily drop from the recess. According to the tip saw of the second aspect, the tip is fitted in the recess by utilizing the recess and the taper of the tip in the plate thickness direction. This makes it easier to set the chips and aligns the fitting positions.

According to the method of manufacturing a tip saw according to the third aspect, the circular saw material is placed in a horizontal state, the tip is fitted into the recess from one surface side thereof, and the flux is applied to the peripheral portion, High frequency induction heating and brazing. As a result, a plurality of chips can be brazed at the same time, and the work of setting the chips on the material becomes easy.

Further, according to the tip saw manufacturing apparatus of the fourth aspect, the circular saw material is placed on the disk, the tip is fitted in the concave portion, and the flux is applied to the peripheral portion by the flux applying means. After that, a high-frequency current is supplied from the inverter to the heating coil. The heating coil arranged in the vicinity of the peripheral portion induces heating of the fitting portion between the chip and the recess to braze the chip to the recess. Since the circular saw material is set and brazed in the concave portion of the chip in a state where the circular saw material is placed horizontally on the disk, the work is facilitated.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a plan view of a tip saw according to the present invention. In FIG. 1, a tip saw 1 has a disk-shaped circular saw material 2 formed by pressing a steel plate material. A mounting hole 3 is formed at the center of the circular saw material 2, and a plurality of chips 5 are provided at the peripheral edge portion 4.
Are brazed and fixed at equal intervals in the circumferential direction.

The chip 5, as shown in FIGS. 2 and 3,
It is brazed and fixed to a plurality of recesses 6 formed at equal intervals on the peripheral edge 4. The concave portion 6 is formed from the peripheral edge side of the circular saw material 2 toward the center side (substantially the attachment hole 3 direction), and on the center side, the width t of the peripheral side opening 6a.
An arcuate locking portion 6a having a diameter t2 larger than 1 is formed. The tip 5 fitted into the recess 6 and fixed by brazing is formed of a sharp tip 5a and an arcuate base 5b. And this chip 5
When fitted in the recess 6, the tip 5a is
It is formed to have a size slightly protruding from.

In this tip saw 1, when the tip 5 is brazed and fixed to the concave portion 6 of the circular saw material 2, the base end portion 5b of the tip 5 and the locking portion 6b of the concave portion 6 are fitted together. Since the locking portion 6b is formed wider than the opening 6a, it is prohibited to move in the direction of the opening 6a. For example, an excessive force acts on the tip 5a of the tip 5 during use. Even in the case of doing so, the chip 5 does not drop out from the recess 6. Therefore, for example, even if there is a portion where the brazing strength of the tip 5 is weak, the tip 5 can be prevented from falling off with care and the tip saw 1 can be used for a long time.

In the tip saw 1 described above, the arcuate locking portion 6b is formed on the center side of the recessed portion 6, but the present invention is not limited to this. For example, referring to FIG. 4 and FIG. It may be formed as shown. That is, the tip saw 11 of FIG.
In this example, an inverted triangular concave portion 13 is formed in the circular saw material 12, and an inverted triangular shaped chip 14 is brazed and fixed to the concave portion 13. Further, the tip saw 21 of FIG. 5 is provided with a square engaging portion 23b on the center side of the concave portion 23 of the circular saw material 22. Even with this configuration, the chip 14,
24 is prohibited from moving toward the peripheral side, and the chips 14,
It is possible to prevent 24 from falling off from the concave portions 13 and 23.

In the above embodiment, the recess 6 and the tip 5 are formed straight in the plate thickness direction of the circular saw blank 2, but, for example, as shown in FIG. 6, they are formed in a taper shape in the plate thickness direction. Good. In this way, when the circular saw blank 2 is placed horizontally and the chip 5 is set in the recess 6, the chip 5 does not fall from the recess 6, and the position of the chip in the plate thickness direction is automatically adjusted. Aligned. Also, the recess 6
Needless to say, the shape of the chip 5 is not limited to the above-described embodiments, and all shapes in which the central side of the recess 6 is formed wide are included.

FIGS. 7 and 8 show a manufacturing apparatus capable of manufacturing the above-mentioned tip saw. In the figure, the manufacturing device 31
Is a disc 33 rotatably arranged on the machine frame 32, and a heating coil 3 arranged at a predetermined interval above the disc 33.
4, an inverter 35 that supplies a high-frequency current to the heating coil 34, a peripheral edge portion 4 of the circular saw blank 2, and an injection nozzle 3
Flux applying device 3 for applying flux via 6
7 and a control device 38 for controlling the inverter 35, the flux coating device 37, and the like.

The rotating shaft 33a of the disk 33 is connected to the rotating shaft 39a of a motor 39 which is rotated by a control signal from the controller 38, and the circular saw blank 2 is placed on the disk 33.
Are placed concentrically. The heating coil 34 is arranged at a predetermined position above the peripheral edge portion 4 of the disk 33, and has a size capable of simultaneously heating a plurality of chips 5, for example. The heating coil 34 is arranged so as to be able to advance and retreat in the up-down direction or the left-right direction in order to easily set and remove the circular saw blank 2 on the disk 33. A foot switch 40 is connected to the control device 38.

Next, an example of a method of manufacturing the tip saw 1 by the manufacturing apparatus 31 will be described. First, the heating coil 34 is raised once, the hardened and tempered circular saw material 2 is placed on the disk 33, and the chips 5 are fitted into the respective recesses 6 from above while rotating the disk 33.
Then, when the chips 5 are fitted into all the recesses 6, the heating coil 34 is lowered to set the circular saw material 2 at a predetermined interval. In this state, for example, when the foot switch 40 is stepped on, the flux applicator 37 is actuated to eject and apply flux from the injection nozzle 36 to the fitting portion of the chip 5 and the recess 6. Disk 3 when flux is applied
3 rotates, and the flux is similarly applied to the next chip 5.

First, the chip 5 to which the flux was applied
Is rotated to the position of the heating coil 34, the control device 3
The control signal of 8 operates the inverter 35 to supply a high-frequency current to the heating coil 34 and to circulate and supply cooling water into the heating coil 34. By supplying this electric current, the fitting portion is induction-heated, and in this state, the chip 5
When a silver solder (not shown) is brought into contact with the portion by, for example, a hand, the silver solder melts and enters a gap or the like of the fitting portion. As a result, one chip 5 is brazed to the recess 6. Then, braze the next rotating chip 5,
When all the chips 5 are brazed and fixed, the heating coil 34 is raised, the chip saw 1 is removed from the disk, and the next circular saw blank 2 is set.

As described above, in the manufacturing apparatus 31 for the tip saw 1, since the circular saw blank 2 is set horizontally, the tip 5 is set in the recess 6 and brazed, so that all the tips 5 are temporarily cut. The brazing can be performed by setting it in the concave portion 6 and the brazing work becomes efficient. In particular, a plurality of chips 5 can be brazed at the same time instead of brazing the chips 5 one by one as in the conventional case, so that the working time can be shortened. Also, circular saw material 2
Is placed on the disk 33 in a horizontal state, the setting positions of the circular saw material 2 in the plate thickness direction can be easily aligned when the chips 5 are set in the recesses 6, and the sharpness is uniformized. As a result, the tip saw 1 of stable quality can be obtained.

In the above embodiment, the heating coil 34 is arranged on one side of the circular saw blank 2, that is, on the upper side.
For example, they may be arranged on the lower surface side of the disc 33, on both sides of the circular saw blank 2, or may be arranged inside the disc 33. Further, in the above embodiment, the chips 5 are all set in the recesses 6 and then brazed. However, for example, the chips 5 are predetermined in the recesses 6 according to the number of chips 5 that can be brazed simultaneously. It is also possible to braze while setting several sets. Furthermore, in the above embodiment, the circular saw material 2 is set on and removed from the disk 33, and the recess 6 of the chip 5 is used.
Mechanization of setting etc. to automate all processes, etc.
It goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0023]

As described above in detail, according to the tip saw of the present invention, it is possible to surely prevent the tip from falling out of the recess of the circular saw material, and it is possible to use it for a long time. . Further, according to the method of manufacturing a tip saw and the apparatus therefor of the present invention, the setting and brazing of the tip in the concave portion can be facilitated, the working efficiency can be improved, and the brazing position of the tip can be made uniform. In addition, the effects such as obtaining a stable quality saw can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a tip saw according to the present invention.

FIG. 2 is a plan view of the main part.

FIG. 3 is an exploded perspective view of the main part.

FIG. 4 is a plan view of a main part showing another embodiment of the tip saw.

FIG. 5 is a plan view of a main part showing still another embodiment of the tip saw.

FIG. 6 is a cross-sectional view of a main part showing still another embodiment of a tip saw.

FIG. 7 is a schematic configuration diagram of a tip saw manufacturing apparatus according to the present invention.

FIG. 8 is a sectional view of the same.

[Explanation of symbols]

 1, 11, 21 Tipped saw 2, 12, 22 Circular saw material 4 Peripheral part 5, 14, 24 Tip 5a Tip part 5b Base end part 6, 13, 23 Recess 6a Opening part 6b Locking part 31 Manufacturing device 32 Machine frame 33 Disk 34 Heating coil 35 Inverter 37 Flux applicator 38 Controller 39 Motor

Claims (4)

[Claims] 1. A tip saw in which a plurality of recesses are formed in the peripheral edge of a circular saw material, and chips are brazed and fixed in the recesses, the recesses being formed such that the center side of the circular saw material is wider than the peripheral side. At the same time, the tip saw is characterized in that the tip end side is formed wider than the tip end side. 2. The tip saw according to claim 1, wherein the recess and the tip are tapered in the plate thickness direction. 3. A circular saw material is provided with a chip having a base end side formed wider than a tip end side in a plurality of recesses formed in a peripheral portion of the circular saw material formed wider than the peripheral side. In this state, the material is fitted from one surface side, flux is applied to this mating portion, and then high-frequency current is supplied to the heating coil arranged on at least one surface side of the circular saw material to be fitted. A method of manufacturing a tip saw, wherein a portion is induction-heated and the tip is brazed to the recess. 4. A motor is rotated on a horizontal plane,
A disk on which a circular saw material having a plurality of recesses whose center side is wider than the peripheral side is placed on the upper surface thereof, a heating coil disposed in the vicinity of the peripheral edge of the circular saw material, and the heating coil An apparatus for manufacturing a tip saw, comprising: an inverter that supplies a high-frequency current to the device; a flux applying unit that applies flux to the peripheral portion of the circular saw material; and a control unit that controls the motor and the inverter.