JP2732018B2 - Chip saw and method of manufacturing the same - Google Patents

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 at a peripheral portion of a circular saw material, and a method for manufacturing the tip saw.

[0002]

2. Description of the Related Art Conventionally, as a tip saw for a brush cutter used for mowing and the like, one disclosed in, for example, Japanese Utility Model Publication No. 3-23055 is known. In this tip saw, a recess is formed in the periphery of a disc-shaped circular saw material, the opposite side surface is tapered so as to spread outward, and both side surfaces of the tip are tapered at the same angle as the recess. , The side surface of the recess and the side surface of the chip are fixed by brazing.

[0003]

However, in this tip saw, the tip is liable to fall out of the recess during use, the work efficiency such as brazing the tip to the recess is poor, and the tip saw has a stable quality. There was a problem that it was difficult to obtain a tip saw. That is, since the concave portion and the chip have a tapered shape that spreads outward, for example, when an excessive force is applied to the chip during use by hitting a stone or the like, if the brazing strength is insufficient, the chip is removed from the concave portion. Easy to fall off. And there is a possibility that the dropped chips may be scattered and hit an operator, and the safety of the operation is deteriorated.

Further, when brazing the chips, if the circular saw material is in a horizontal state, the chips are likely to fall off from the tapered recesses during brazing, so that the circular saw material is generally brazed in a vertical state. ing. The brazing operation involves setting the chips in the concave portions, applying the flux, brazing after the application, rotating the circular saw material, and brazing the chips to the next concave portions in the same manner. It is performed sequentially over the entire circumference. For this reason, it is necessary to perform each operation for each of the concave portions, and the operation efficiency is inferior, for example, the operation time for brazing one circular saw material becomes long.
In addition, since the chip is set in the concave portion when the circular saw material is in a vertical state, the setting position of the chip tends to vary in the thickness direction of the circular saw material, and it is difficult to obtain a stable material in quality.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and a first object of the present invention is to make it possible to reliably prevent chips from falling out of recesses and to make the amount of protrusion of the chip thickness uniform. A second object of the present invention is to provide a tip saw having excellent sharpness and sharpness. A second object of the present invention is to provide a method of manufacturing a tip saw capable of improving work efficiency such as brazing of a tip into a concave portion and obtaining a tip saw of stable quality. Is to do.

[0006]

In order to achieve the above object, a tip saw according to claim 1 has a circular saw material in which a plurality of concave portions are formed in a peripheral portion of the circular saw material, and chips are brazed and fixed in the concave portions, respectively. A circular recess is formed by forming the circular saw material with the center side wider than the peripheral edge side, and the concave portion having the base end side wider than the distal end side and the contact surface with the circular saw material formed in a tapered surface in the plate thickness direction. It is characterized in that, while being fitted from the plate thickness direction of the saw material, a part of the chip is brazed and fixed so as to protrude from both sides in the plate thickness direction of the circular saw material.

According to a second aspect of the present invention, there is provided a tip saw in which a plurality of concave portions are formed in a peripheral portion of the circular saw material, and the chips are respectively fixed to the concave portions by brazing. Formed to be wider than the side and formed to have a tapered surface in the plate thickness direction on the contact surface with the chip, and insert the concave portion with the base end side wider than the distal end side from the plate thickness direction of the circular saw material. It is characterized in that it is fitted and brazed and fixed, with a part of the tip protruding from each side of the circular saw material in the thickness direction.

According to a third aspect of the present invention, the concave portion has a tapered surface that is tapered and tapered in the thickness direction of the circular saw material.

According to a fourth aspect of the present invention, there is provided a method for manufacturing a tip saw, comprising: a plurality of recesses provided in a peripheral portion of a circular saw material, the central side being wider than the peripheral side; Using the tapered surface in the thickness direction formed on both sides of the circular saw material in the thickness direction of the circular saw material in the contact surfaces of the chips or recesses from both sides in the thickness direction of the circular saw material, a part of the chip is After fitting on both sides so as to protrude, and applying a flux to this fitting part, high-frequency current is supplied to a heating coil arranged on at least one side of the circular saw material to induction-heat the fitting part. The chip is brazed to the recess.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a tip saw, wherein a tip is fitted into a predetermined recess from one side of the circular saw material, brazed and fixed, and then the other side of the circular saw material. The chip is fitted into a predetermined recess and fixed by brazing.

[0011]

According to the tip saw of the first to third aspects, a tip having a base end side wider than a tip end side is provided.
By fixing the center side to the recess formed wider than the peripheral side, it is possible to reliably prevent the chip from falling off from the concave side toward the peripheral side, and to make the taper in the thickness direction formed on the concave or chip contact surface. The surface also prevents the chip from coming off in the thickness direction, so that the chip does not easily fall out of the concave portion even when, for example, the brazing strength is poor. Further, by forming the contact surface of the chip or the concave portion so as to have a tapered surface in the thickness direction of the circular saw material, the chip can be fitted into the concave portion using this tapered surface, and the chip can be set. And the fitting position, that is, the fixing position of the tip (the amount of protrusion from the side surface of the circular saw material) is made uniform, and a tip saw with excellent sharpness can be obtained.

Further, according to the method for manufacturing a tip saw according to the fourth or fifth aspect, the circular saw material is set, for example, in a horizontal state, and the taper surface in the plate thickness direction formed on the contact surfaces of the tips or the concave portions with each other. Utilizing this, the tip is fitted into the recess from one side of the circular saw material, and after applying a flux to the peripheral portion, high-frequency induction heating is performed and brazing is performed. As a result, a plurality of chips can be brazed at the same time, the positioning of the chips in the concave portion is automatically performed by the tapered surface, and the work of setting the chips in the circular saw material is facilitated, and a stable quality of the chip saw is obtained. Can be easily obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail 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 disc-shaped circular saw material 2 formed by pressing a steel plate material. A mounting hole 3 is formed in the center of the circular saw blank 2, and a plurality of chips 5 are brazed and fixed to the peripheral edge 4 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 concave portions 6 formed at equal intervals on the peripheral portion 4. The concave portion 6 is formed from the peripheral side of the circular saw blank 2 toward the center side (substantially the direction of the mounting hole 3), and has a width t of the opening 6a on the peripheral side near the center side.
An arc-shaped locking portion 6a having a diameter t2 larger than 1 is formed. The chip 5 fitted into the concave portion 6 and fixed by brazing is formed of a pointed tip portion 5a and an arc-shaped base portion 5b. And this chip 5
When the tip 5a is fitted into the recess 6,
The tip 5 is formed to have a size slightly protruding from
Of the circular saw blank 2 alternately project in the thickness direction of the circular saw blank 2 as shown in FIG.

In the tip saw 1, when the tip 5 is brazed and fixed to the concave portion 6 of the circular saw blank 2, the base end portion 5b of the tip 5 and the locking portion 6b of the concave portion 6 are fitted. Since the locking portion 6b is formed wider than the opening 6a, the movement in the direction of the opening 6a is prohibited. For example, an excessive force acts on the tip 5a of the chip 5 during use. In this case, the chip 5 does not fall out of the recess 6. Therefore, even if there is a portion where the brazing strength of the chip 5 is weak, for example, the chip 5 is prevented from falling off safely.

In the above-mentioned tip saw 1, an arc-shaped engaging portion 6b is formed in the concave portion 6, but the present invention is not limited to this. For example, as shown in FIGS. It may be formed. That is, the tip saw 11 shown in FIG. 5 is formed by forming a substantially inverted triangular concave portion 13 in a circular saw blank 12 and brazing and fixing an inverted triangular tip 14 to the concave portion 13. The tip saw 21 shown in FIG.
A protrusion 23b is provided on the center side of the recess 23 of the
The chip 24 is fixed to the chip 24 by brazing. Even with such a configuration, the movement of the chips 14 and 24 in the peripheral edge direction is prohibited, and the chips 14 and 24 are prevented from falling out of the concave portions 13 and 23.

As shown in FIG. 7, for example, the concave portion 6a in the above embodiment includes a concave portion 33a having a tapered surface tapered in the plate thickness direction and a concave portion 33 having a tapered surface tapered in the thickness direction.
b are formed alternately, and the chip 34 fitted into the recesses 33a and 33b
a and 33b are configured so as to have a tapered surface at a contact portion thereof. Then, the brazing of the tip 34 to the concave portions 33a and 33b is performed by keeping the circular saw material 2 in a horizontal state,
The chip 34 is set in 3a and brazed. Thereafter, the circular saw blank 2 is turned over, and the chip 34 is set in the recess 33b and brazed. Accordingly, when the chip 34 is set in the recesses 33a and 33b, the chip 34 does not fall out of the recesses 33a and 33b, and the position of the chip 34 in the thickness direction is automatically aligned, and the chip 34 is in use by the tapered surface. Of the chip 34 in the plate thickness direction (the plate thickness direction of the circular saw blank 2) is also prevented.

The shapes of the concave portion and the chip are not limited to those of the above-described embodiments, and it is needless to say that a concave portion having a central portion formed wider than the opening portion is included. The form in which the tips are projected on both sides of the circular saw material is also set as appropriate in accordance with the type of the object to be cut, such as, for example, alternately projecting a plurality of chips or projecting randomly.

FIGS. 8 and 9 show an apparatus for manufacturing the tip saw 1. FIG. In the figure, a manufacturing apparatus 41 includes a disk 43 rotatably disposed on a machine frame 42, and a disk 4
A heating coil 44 disposed at a predetermined interval above the heating coil 3 and an inverter 4 for supplying a high-frequency current to the heating coil 44
5, a flux application device 47 for applying a flux to the peripheral portion 4 of the circular saw material 2 via an injection nozzle 46, a control device 48 for controlling the inverter 45, the flux application device 47, and the like.

The disk 43 has a rotating shaft 43a connected to a rotating shaft 49a of a motor 49 which rotates according to a control signal of a control device 48.
Are placed concentrically. The heating coil 44 is arranged at a predetermined position above the peripheral portion 4 of the disk 43 and is set to a size capable of heating a plurality of chips 5 at the same time, for example. The heating coil 44 is arranged so as to be able to move up and down or up and down in order to facilitate setting and removal of the circular saw blank 2 on the disk 43. Note that a foot switch 50 is connected to the control device 48.

Next, an example of a method of manufacturing the chip saw 1 by the manufacturing apparatus 41 will be described. First, the heating coil 44 is once raised, the quenched and tempered circular saw material 2 is placed on the disk 43, and the disk 43 is rotated while the tapered surface of the concave portion 33a and the tip 34 The chips 34 are fitted from above by utilizing the above. Then, when the chip 34 is fitted in the predetermined concave portion 33a, the heating coil 44 is lowered to set a predetermined distance from the circular saw blank 2. In this state, for example, when the foot switch 50 is depressed, the flux applying device 47 is operated, and the tip 34 and the concave portion 33 a
The flux is sprayed and applied to the fitting portion of. When the flux is applied, the disk 43 rotates, and the flux is similarly applied to the next chip 34.

The chip 34 to which the flux is applied first
Is rotated to the position of the heating coil 44, the control device 4
In response to the control signal of 8, the inverter 45 operates to supply the high-frequency current to the heating coil 44 and to circulate and supply the cooling water into the heating coil 44. By supplying this current, the fitting portion is induction-heated.
When a silver braze (not shown) is brought into contact with the four portions, for example, by hand, the silver braze is melted and enters the gaps of the fitting portions. Thereby, one chip 34 is soldered to the concave portion 33a. Then, for example, every other next chip 34 rotating similarly is brazed, and when the chip 34 on one side is fixed by brazing, the heating coil 44 is raised, and the tip saw 1 is disc 43 Remove it from the top, turn it over and set it on the disk 43 again.

Then, similarly to the above, the chip 34 is brazed to the other concave portions 33b, and when all brazing is completed, the circular saw material 2 is removed from the disk 43, and the next circular saw is cut. Material 2 is set. In the case where the circular saw material 2 is turned upside down and brazed, the chip 34 brazed on one side protrudes, so that the lower surface of the concave portion 33b to be brazed has the same height as the protrusion height of the chip 34. (Not shown) is set. Thereby, the protrusion amount of the tip 34 from the circular saw blank 2 becomes the same on both surfaces.

As described above, in the method for manufacturing the tip saw 1, the circular saw material 2 is kept horizontal and the tip 34
Since the chip 34 is set in the recesses 33a and 33b and brazed, the chip 34 can be once set in the predetermined recesses 33a and 33b and brazed, and the brazing work is made more efficient. In particular, instead of brazing chips 34 one by one as in the conventional case, a plurality of chips 34 can be brazed at the same time, so that work time and the like can be reduced. In addition, since the circular saw material 2 is placed on the disk 43 in a horizontal state, the chips 34 are placed in the concave portions 33a and 33b.
When the circular saw material 2 is set in the circular saw material 2, the set position in the thickness direction of the circular saw material 2 is made uniform, and in particular, the amount of protrusion of the circular saw material 2 from both sides can be easily made uniform, and the sharpness becomes uniform. For example, the tip saw 1 of stable quality can be obtained.

In the above embodiment, the heating coil 44 is arranged on one side of the circular saw blank 2, that is, on the upper side.
For example, it may be arranged on the lower surface side of the disk 43, on both side surfaces of the circular saw blank 2, or may be arranged in the disk 43. In the above embodiment, the chip 34 is
Although the brazing is performed after setting all of the chips 3a and 33b, for example, according to the number of chips 34 that can be brazed at the same time, a predetermined number of chips 34 are brazed while being set in the recesses 33a and 33b. Can also. Further, in the above-described embodiment, the gist of the present invention is lost, such as setting and removing the circular saw material 2 on the disk 43, mechanizing the setting of the chip 34 in the concave portions 33a and 33b, and automating all processes. It goes without saying that various changes can be made without departing from the scope.

[0026]

As described in detail above, claims 1 to 3
According to the described chip saw, it is possible to reliably prevent the chip from falling from the center side of the concave portion of the circular saw material to the outer peripheral side and to prevent the circular saw material from falling in the plate thickness direction, and to reduce the taper surface of the concave portion and the chip. Thus, a tip saw with excellent sharpness can be obtained by making the tip protrusion amount uniform. Further, according to the method for manufacturing a chip saw according to the fourth or fifth aspect, it is easy to set and braze the chip into the concave portion, thereby improving the working efficiency and uniformizing the brazing position of the chip. This has the effect of obtaining a stable and stable tip saw.

[Brief description of the 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 side view of the main part.

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

FIG. 6 is a plan view of a main part showing still another embodiment of the tip saw.

FIG. 7 is a sectional view of a main part showing still another embodiment of the tip saw.

FIG. 8 is a schematic configuration diagram of a chip saw manufacturing apparatus according to the present invention.

FIG. 9 is a sectional view of the same.

[Explanation of symbols]

 1, 11, 21 Tip saw 2, 12, 22 Circular saw material 4 Peripheral edge 5, 14, 24, 34 Tip 5a Tip 5b Base end 6, 13, 23, 33a, 33b Recess 6a Opening 6b Lock 41 Manufacturing device 42 Machine frame 43 Disk 44 Heating coil 45 Inverter 47 Flux coating device 48 Control device 49 Motor

Claims (5)

(57) [Claims] 1. A tip saw in which a plurality of concave portions are formed in a peripheral portion of a circular saw material and chips are brazed and fixed to the concave portions, wherein the concave portion is formed so that the center side of the circular saw material is wider than the peripheral portion side. A chip whose base end side is wider than the distal end side in the concave portion and whose contact surface with the circular saw material is formed in a tapered surface in the plate thickness direction is fitted in the circular saw material in the plate thickness direction, and a part of the chip is fitted. Characterized in that they are brazed and fixed so as to protrude from both sides in the thickness direction of the circular saw material, respectively. 2. A tip saw in which a plurality of concave portions are formed in a peripheral portion of a circular saw material and chips are brazed and fixed to the concave portions, wherein the concave portion is formed to be wider at a center side of the circular saw material than at a peripheral portion side. Along with the tip, the tip is formed to have a taper surface in the plate thickness direction on the contact surface with the tip, and the recess is formed such that the base end side is formed wider than the tip end side in the thickness direction of the circular saw material. A tip saw in which a part of the tip is brazed and fixed so as to protrude from both sides in the thickness direction of the circular saw material, respectively. 3. The tip saw according to claim 1, wherein the concave portion has a tapered surface that tapers and a taper that tapers in the thickness direction of the circular saw material. 4. A circular saw material chip provided in a plurality of recesses provided at a peripheral portion of the circular saw material and having a central side wider than the peripheral side and a base end side formed wider than the distal end side. Utilizing a tapered surface in the thickness direction formed on the contact surface of the chip or the concave portion from both sides in the thickness direction, a part of the chip is fitted so as to protrude on both sides of the circular saw material, respectively. After applying flux to the fitting portion, a high-frequency current is supplied to a heating coil disposed on at least one side surface of the circular saw material to induction-heat the fitting portion, and the chip is brazed to the recess. A method for manufacturing a tip saw, comprising: 5. A chip is fitted into a predetermined recess from one side of the circular saw material and fixed by brazing. Thereafter, the chip is fitted into a predetermined recess from the other side of the circular saw material. The method according to claim 4, wherein the tip saw is fixed by brazing.