JPH07308817A - Chip saw - Google Patents

Abstract

PURPOSE:To provide a chip saw which can prevent coming off from a recess part of a chip, and which can enhance the working efficiency of brazing or the like to the recess part of the chip, and which can make brazing positions uniform in the direction thicknesswise of the chip. CONSTITUTION:In a chip saw in which a plurality of recesses 6 are formed in the peripheral edge part 4 of a circular saw blank, and chips 5 are brazed in the recesses 6, respectively, each recess is so formed that its saw blank center side is wider than its peripheral edge side, and each chip 5 is so formed that its proximal end side is wider than its distal end side. A thicknesswise tapered surface is formed at least one of the abutting surfaces of the recess 6 and the chip 5. The chip 5 is formed in, for example, a substantially triangular shape as viewed in a plan view, and is fitted in the recess 6 in the direction thicknesswise of the saw blank, thereby it is positioned by the tapered surface while it is secured by brazing.

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.

[0002]

2. Description of the Related Art Conventionally, as a tip saw used for cutting grass, for example, the one disclosed in Japanese Utility Model Publication No. 3-23055 is known. In this tip saw, a concave portion is formed in the peripheral portion of a circular saw material having a disk shape, and the opposite side surfaces are tapered so as to expand outward, and both side surfaces of the tip are tapered at the same angle as the concave portion. 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 such as brazing work of the tip into the recess is poor, and stable quality is obtained. There was a problem that it was difficult to obtain the 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, It easily comes off from 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. It goes around all around.

For this reason, it is necessary to perform each work on 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 is set in the recess in the vertical state, the chip setting position 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 an object thereof is to prevent the chip from coming off from the recess and to improve the work efficiency such as brazing work of the chip into the recess. Another object of the present invention is to provide a tip saw which can make the brazing position of the circular saw material of the tip uniform in the plate thickness direction.

[0007]

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 of the circular saw material is wider than the peripheral side, and the tip is formed so that the base end side is wider than the tip side, and one of the contact surfaces of the recess and the tip is a taper surface in the plate thickness direction, The chip is fitted in the recess from the plate thickness direction and brazed. Also,
A tip saw according to a second aspect is characterized in that the tip is formed in a substantially triangular shape in a plan view.

[0008]

According to the tip saw of the first aspect, the tip whose base end side is wider than the tip end side is fitted into the concave portion whose center side is wider than the peripheral edge side and fixed by brazing. The chip is inserted from the plate thickness direction of the circular saw material. At this time, for example, the side surface of the chip in the plate thickness direction is formed into a tapered surface, so that the chip is inserted even if the circular saw material is in a horizontal state. Is prevented from falling out of the recess of the
The chips can be easily set in the recesses, the work efficiency is improved, and the brazing positions of the chips in the plate thickness direction are uniformly arranged. Further, according to the tip saw of the second aspect, the shape of the tip and the recess is simplified by the substantially triangular tip, and the work of setting the tip is further facilitated.

[0009]

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 its peripheral edge 4.
Are brazed and fixed at equal intervals in the circumferential direction.

As shown in FIGS. 2 to 4, the chip 5 is brazed and fixed in a plurality of recesses 6 formed in the peripheral portion 4 at equal intervals. The concave portion 6 is formed from the peripheral side of the circular saw material 2 toward the center side (substantially the mounting hole 3 direction), and has a linear opening 6a formed on the peripheral side.
It has a circular locking portion 6b formed on the center side. The diameter t2 of the locking portion 6b is set to be larger than the width t1 of the opening 6a, and the recess 6 is formed straight (perpendicular) in the plate thickness direction of the circular saw blank 2.

A chip 5 brazed and fixed in the recess 6
Has a pointed tip portion 5a serving as a blade, an arcuate base end portion 5b, and a linear portion 5c formed between the tip end portion 5a and the base end portion 5b. Both sides of the straight portion 5c in the plate thickness direction are tapered surfaces T that are tapered from the upper surface 5c1 side toward the lower surface 5c2 side, and for example, the width t of the upper surface 5c1.
3 is larger than the width t1 of the opening 6a of the recess 6, and the lower surface 5c
The width t4 of 2 is set smaller than the width h1.

The outer shape of the base end portion 5b is set to be substantially the same as the inner diameter of the locking portion 6b of the recess 6. When the tip 5 is fitted into the recess 6 as will be described later, the tip 5a slightly protrudes from the peripheral edge 4 of the circular saw material 2 in the outer diameter direction and, for example, the upper surface 5c1 slightly extends in the plate thickness direction. The size is set to project. The lower surface 5c2 of the chip 5 may be flush with the back surface of the circular saw material 2 or may project from the back surface.

The tip saw 1 is manufactured, for example, as follows. That is, first, the circular saw material 2 formed into a predetermined shape is set in a horizontal state, and the concave portion 6 of the circular saw material 2 is set.
Then, the chip 5 is inserted from above. At that time, the taper surface T of the straight line portion 5 c of the chip 5 is fitted into the opening 6 of the recess 6 while fitting the locking portion 6 b of the recess 6 and the base end portion 5 b of the chip 5.
Fit to the position where it contacts the upper edge of a. This allows
The tip 5 does not fall off from the concave portion 6 of the circular saw material 2,
It is set on the circular saw material 2. At this time, the tip surface of the straight portion 5c of the tip 5 aligns its set position, that is, the amount of protrusion from the surface of the circular saw blank 2.

When one or a large number of chips 5 are set in the recesses 6 and an inverter device (not shown) is operated to heat the chips 5 and the recesses 6 by high frequency induction heating, the brazing material R in contact Melts, and the chip 5 is brazed to the recess 6 as shown in FIG. At this time,
A gap K is formed between the taper surface T of the straight portion 5c of the chip 5 and the recess 6, and this gap K is also filled with the brazing material R.

As described above, in the tip saw 1 of the above-described embodiment, the opening 6a of the recess 6 is formed narrower than the engaging portion 6b, and the base end 5b and the straight line 5a and the straight line are formed in the recess 6. Since the tip 5 formed wider than the portion 5c is fitted and brazed, the movement of the tip 5 in the direction of the opening 6a is surely prohibited, and, for example, an excessive force is applied to the tip portion 5a of the tip 5 during use. Even when it acts, 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 dropping off without fail, and the tip saw 1 can be used for a long period of time. The danger of hitting people is eliminated, and the safety of mowing work is improved.

Further, since the tip 5 has a tapered surface T having a width t3 wider than the width t1 of the recess 6, when the tip 5 is fitted and set in the recess 6 of the circular saw material 2, the tip 5 is The taper surface T is prevented from falling off from the concave portion 6.
The fitting positions are aligned by. As a result, the work of setting the chips 5 is facilitated and, for example, a plurality of chips 5 are set.
It is possible to improve the working efficiency of the brazing of the chips 5 such that the brazing can be performed at the same time and the polishing work of the chips 5 after the brazing is unnecessary. Further, since the protrusion amount of the tip 5 from the surface of the circular saw material 2 is made uniform, a high quality tip saw 1 is obtained, and since the recess 6 is straight in the plate thickness direction, the circular saw material 2 is manufactured. And the cost of the tip saw 1 can be reduced.

In the tip saw 1 described above, the circular engaging portion 6b is formed on the center side of the concave portion 6, but the present invention is not limited to this, and as shown in FIG. 5, for example. You may form. That is, in the tip saw 11, a circular saw material 12 is formed with a concave portion 13 having a substantially triangular shape, a tip 14 is formed in a substantially equilateral triangular shape in a plan view, and side surfaces 14a and 14b corresponding to two sides of the triangle are tapered surfaces. T, side 1
4c as a straight surface (vertical surface)
Is brazed and fixed in the recess 13 as in the above-described embodiment.

Even with this structure, as in the above-described embodiment, the movement of the recess 14 of the chip 14 in the opening direction is prohibited, the chip 14 is prevented from falling out of the recess 13, and at the same time the chip 14 is prevented. The work of setting 14 in the recess 13 becomes easy. Further, by forming the tip 14 into a substantially equilateral triangle shape, the fitting direction into the recess 13 is not specified, and the recess 13 is not formed.
It becomes easier to set work on the circular saw material 2, and it becomes easier to form the concave portion 13 on the circular saw material 2 and to manufacture the tip 14, so that the cost of the tip saw 1 can be further reduced.

In the above embodiments, the pair of side surfaces of the chips 4 and 14 are tapered surfaces T, but the present invention is not limited to this, and all the surfaces fitted into the recesses 6 and 13 are tapered. The surface T may be used, or only a part of the pair of side surfaces may be used as the tapered surface T. Further, in the above embodiment, the tapered surfaces T are formed on the chips 5 and 14, but the tapered surfaces T are formed on the side surfaces of the concave portions 6 and 13 of the circular saw material 2, and the side surfaces of the chips 5 are formed straight. Is also good.

Further, the shapes of the recess and the tip in the above embodiments are not limited to the above embodiments, and the center side of the recess is compared with the opening side, for example, when the engaging portion is formed in a square shape. It goes without saying that it includes recesses of all shapes formed wide and chips corresponding to the recesses.

[0021]

As described in detail above, according to the tip saw of the present invention, it is possible to reliably prevent the tip from falling out of the concave portion of the circular saw material, and it is possible to use it for a long period of time. The chips can be easily set in the recesses of the circular saw material, and the working efficiency of the brazing work can be improved. Further, the chips can be uniformly brazed to the concave portions of the circular saw material, so that a high-quality saw can be obtained, and the cost of the saw can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment 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 sectional view taken along line AA of FIG.

FIG. 5 is a plan view of an essential part showing another embodiment of the tip saw according to the present invention.

[Explanation of symbols]

 1, 11 Tip Saw 2, 12 Circular Saw Material 4 Peripheral Edge 5, 14 Tip 5a Tip 5b Base End 5c Straight Section 6, 13 Recess 6a Opening 6b Locking Section 14a, 14b Side T Tapered Surface K Gap R Brazing Material

Claims (2)

[Claims] 1. A chip saw in which a plurality of recesses are formed in the peripheral edge of a circular saw material, and chips are brazed and fixed to the recesses, the recesses being formed such that the center side of the circular saw material is wider than the peripheral side. The base end side of the chip is formed wider than the front end side, and one of the contact surface of the recess and the chip is a taper surface in the plate thickness direction, and the chip is fitted into the recess in the plate thickness direction and brazed. A tip saw that is characterized. 2. The tip saw according to claim 1, wherein the tip is formed in a substantially triangular shape in a plan view.