JP3449091B2 - Saw blade - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saw blade for cutting metal, wood, plastic and ceramic materials.

[0002]

2. Description of the Related Art Conventionally, a technique of joining a cutting edge tip to a base metal by laser welding is known from JP-A-2-24022. In this conventional example, the blade tip in the recess of the disc-shaped base metal is arranged and welded so that the blade tip portion of the tip projects outward from the outer periphery of the base metal,
Moreover, an intermediate layer is provided between the blade tip and the recess.

[0003]

In the above-mentioned conventional example, in the saw blade, since there is no space at the joint between the blade tip and the base metal, heat is not sufficiently dissipated during welding, and distortion due to heat occurs. However, there is a problem that deformation occurs, and when used as a saw blade for cutting, deformation due to heat or the like occurs, resulting in a saw blade having a large cutting resistance.

Further, in the above-mentioned conventional example, when the blade tip is joined to the base metal by laser welding, the side to which the load is applied and the side to which the load is not applied have the same joining length. However, the unnecessary parts are also joined, and it takes a long time to join, which causes a cost increase.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to sufficiently radiate heat during welding or when cutting by using as a saw blade. It is an object of the present invention to provide a saw blade which can prevent deformation due to, reduce the cutting resistance, and can position the joint for accurate jointing and that does not require much time for joining.

[0006]

The saw blade of the present invention comprises a base metal 1
In the saw blade 3 in which the blade tip 2 is joined to the base blade 1, the base metal 1 is provided with a concave positioning support portion 4 for positioning and supporting the blade tip 2 , and the positioning support portion 4 is provided with the blade tip 2.
Fit and cut with the front and rear edges of the positioning support 4
The side that is loaded at the time of disconnection is joined to the base metal 1 by laser welding
On the front side in the circumferential direction so that no load is applied when cutting
The front edge of the positioning support portion 4 to abut and support
Positioning support that is the side that is not loaded when cutting
The heat radiation hole 5 is provided in the front part of the bottom part of the No. 4 and next to the welded part 13 . With such a configuration, the cutting edge tip 2 can be joined to the base metal 1 by laser welding or the like while being positioned and supported by the positioning support portion 4.
The time required for joining can be shortened by joining the side to which the load is applied at the time of joining to the base metal 1 even at the time of joining and supporting the side that is not loaded at the time of cutting with a smaller supporting force than the side on which the load is applied. Then, heat generated during welding or cutting by using as a saw blade can be radiated from the heat radiating hole 5 provided in the joint portion to prevent deformation due to heat.

It is also preferable to provide a concavo-convex portion 6 for positioning the blade tip 2 with respect to the base 1 in the radial and circumferential directions on one surface of the joint between the base 1 and the blade tip 2. With such a configuration, the concave-convex portion 6 can reliably position the cutting edge tip 2 with respect to the base metal 1 in the radial direction and the circumferential direction.

Further, a spring 7 is provided at a portion of the positioning support portion 4 provided on the base metal 1 on a side where a load is not applied at the time of cutting by the cutting edge tip 2, and the spring tip 7 presses the cutting edge tip 2 fitted in the positioning support portion 4. It is also preferable to support.
With such a structure, a simple structure of the spring 7 can be used to support and position a portion of the blade tip 2 on the side not loaded .

It is also preferable to form an uneven fitting portion 10 for positioning the base metal 1 and the cutting edge tip 2 in the mutual thickness direction. With such a configuration, the positioning in the thickness direction can be surely performed.

Further, it is also preferable to interpose the vibration absorbing material 11 at the joint portion between the blade tip 2 and the base metal 1 on the side where no load is applied during cutting. With this configuration,
Vibration absorbing material for vibration when cutting by using as a saw blade 11
It is possible to reduce the vibration by absorbing by .

[0011]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the embodiments shown in the accompanying drawings.

1 to 4 show an embodiment of the present invention. The base metal 1 constitutes the main body of the saw blade 3, and in the embodiment the saw blade 3 is a circular saw blade, so the base metal 1 has a disk shape as shown in FIG. 2A. A large number of concave positioning support portions 4 are provided on the outer peripheral portion of the disc-shaped base metal 1. This base metal 1 is SK5, SKS51
Etc. and processed by press molding. The front part of the bottom of each positioning support part 4 with respect to the base metal 1 (here, the saw blade 3
A heat dissipation hole 5 is formed in the front side in the cutting direction when used as ().

The cutting edge tip 2 is made of superalloy or SKH57.
It is made of a high alloy steel material such as, and manufactured by machining, powder sintering, MIM (metal powder injection molding) or the like. Here, in the case of a material that requires heat treatment, such as high alloy steel, heat treatment is performed in advance. The shape of the cutting edge tip 2 may be a final shape having a cutting edge, or the cutting edge may be formed by grinding in a subsequent step.

As shown in FIG. 3B, the cutting edge tip 2 is fitted into the concave positioning support portion 4 of the base metal 1 and is sandwiched by the front and rear edges of the positioning support portion 4 so as to be temporarily held in the positioned state. Yes, the blade tip 2 is positioned and supported by the positioning support portion 4 of the base metal 1 and is temporarily held in this way, and the blade tip 2 is irradiated onto the base metal 1 with a laser 12 as shown in FIG. To do. In FIG. 1, reference numeral 13 indicates a welded portion by laser welding, and the portion joined by this laser welding is a portion to which a load is applied at the time of cutting by the formed saw blade 3. Therefore, in the embodiment shown in FIG. 1, the joining by laser welding welds only the side to which a load is applied when cutting with the saw blade 3, and the side where no load is applied when cutting with the saw blade 3,
That is, on the front side in the circumferential direction, the saw blade 3 is only abutted and supported by the front edge portion of the positioning support portion 4 provided on the base metal 1, and therefore, the support on the side where no load is applied during this cutting. Is supported with a smaller supporting force than the side on which the load is applied during cutting. In addition, base metal 1
As described above, the heat radiating hole 5 provided at the bottom is provided at the front part of the bottom portion of the positioning support portion 4, which is the side on which the load is not applied during cutting. That is, the heat dissipation hole 5 is provided at a place where welding is not required and adjacent to the welded portion 13.

By the way, when the blade tip 2 is joined to the base metal 1 by brazing, since the heating is required in the joining step, the blade tip 2 made of a material requiring heat treatment such as high alloy steel is Although there is a problem of blunting, when the laser welding is adopted as described above, heat is applied only to the joint portion and the cutting blade portion is not affected by heat, so that the blade tip portion is not blunted. Moreover, if laser welding is adopted, high-speed joining can be achieved. Since the blade tip 2 is positioned and supported by the positioning support portion 4 as described above and can be bonded in a temporarily fixed state, distortion and deformation due to heat during laser welding are prevented, and dimensional accuracy after bonding is stabilized. The saw blade 3 with high accuracy can be obtained.

When cutting with the saw blade 3 having the above structure, heat is generated at the time of cutting because the heat radiating hole 5 is provided on the base metal 1 side of the joint between the blade tip 2 and the base metal 1. As a result, deformation of the base metal 1 due to heat generated during cutting is suppressed, and the base metal 1 is less likely to deform during cutting,
The cutting resistance is reduced, and the finish of the cut surface is improved.

5 and 6 show another embodiment of the present invention. In the present embodiment, a concavo-convex portion 6 for positioning the blade tip 2 in the radial direction and the circumferential direction with respect to the base 1 is provided on one surface of the joint between the base 1 and the blade tip 2. In the embodiment of FIG. 6, the uneven portion 6 is
A convex portion 6a is provided below the rear portion of the blade tip 2, a concave portion 6b is provided below the rear edge portion of the positioning support portion 4 of the base metal 1, and the convex portion 6a is fitted into the concave portion 6b to provide temporary support for positioning. The uneven portion 6 is configured. Thus, by providing the uneven portion 6 for positioning the blade tip 2 in the radial direction and the circumferential direction with respect to the base metal 1 on one surface of the joint between the base metal 1 and the blade tip 2, the radial direction and the circumferential direction can be improved. Direction can be surely determined, and the convex portion 6a is formed into the concave portion 6b as shown in FIG. 6B.
The saw blade 3 is obtained by joining the blade tip 2 to the base metal 1 by laser welding in a state in which the saw blade 3 is fitted and positioned and held. Here, although not shown, the recess 6b may be formed in the blade tip 2 and the protrusion 6a may be formed in the base metal 1, or both the protrusion 6a and the recess 6b may be formed in the blade tip 2. Both the concave portion 6b and the convex portion 6a may be formed on the base metal 1, respectively.

FIG. 7 and FIG. 8 show still another embodiment of the present invention. In this embodiment, the spring 7 is provided at a portion of the positioning support portion 4 provided on the base metal 1 on the side where the load is not applied when the cutting edge tip 2 is cut. When elastically sandwiching and positioning and supporting (in this case, the convex portion 6a is further fitted into the concave portion 6b for positioning in this embodiment), the spring 7 causes the blade tip 2 to move as shown in FIG. 8B. The saw blade 3 as shown in FIG. 7 is obtained by pressing and supporting the lower part of the front part, and joining the blade tip 2 to the base metal 1 by laser welding in the state where it is positioned and supported in this way.
Then, when the cutting edge tip 2 is fitted into the positioning support portion 4 and sandwiched from the front and the back for positioning support, the spring 7 elastically presses to prevent distortion and deformation due to heat during laser welding. There is. In the present embodiment, the spring 7 is a part of the base metal 1, and the spring 7 is configured by integrally projecting an elastic projecting piece having a free end at the base metal 1 from the base metal 1 .

FIG . 9 shows still another embodiment of the present invention. As shown in FIG.
As shown in (a), the blade tip 2 is fitted and sandwiched from the front and back to be temporarily held in a positioned state. In this case, in the present embodiment, the blade tip 2 and the base metal 1 on the side where no load is applied during cutting are provided. The vibration absorbing material 11 is press-fitted and interposed in the joint portion. As the vibration absorber 11, plastic, urethane rubber or the like is used. Then, as described above, the cutting edge tip 2 is inserted into the positioning support portion 4 of the base metal 1 with the vibration absorbing material 11 interposed therebetween, and is clamped from the front and rear to be positioned and supported, and the cutting edge tip 2 is temporarily supported. The gold 1 is joined by laser welding as shown in FIG. 9 (b). By interposing the vibration absorbing material 11 in this way,
The vibration at the time of cutting can be absorbed by the vibration absorber 11 to reduce the vibration .

10 to 13 show still another embodiment of the present invention. In this embodiment, the base metal 1 and the cutting edge tip 2 are provided with the concave-convex fitting portion 10 for mutual positioning in the thickness direction.

Here, as an example of the concave and convex fitting portion 10 for positioning the base metal 1 and the cutting edge tip 2 in the mutual thickness direction, for example, FIG. 10 or FIG. 11 or FIG.
2 or an embodiment as shown in FIG. 13 is possible. Figure
10 humps 10 in which the stepped in the thickness direction of the cutting tip 2 in
a, forming a stepped recess 10b in the base metal 1,
The stepped convex portion 10a is fitted to the stepped concave portion 10b to position and support it in the thickness direction (in this case, although not shown, the cutting edge tip 2 is different from that of each of the above-described embodiments). As described above, the positioning support portion 4 is fitted into the positioning support portion 4 and is sandwiched from the front and the rear to be positioned. In this manner, the figure is shown with the positioning and supporting in the circumferential direction, the radial direction, and the thickness direction .
The laser 12 is irradiated as shown in FIG.
As described above, the blade tip 2 is joined to the base metal 1 by laser welding to obtain the saw blade 3.

In FIG . 11 , a protrusion 10a is formed in the thickness direction of the cutting edge tip 2, a recess 10b is formed in the base metal 1, and a protrusion 1 is formed.
An example is shown in which 0a is fitted in the recess 10b, positioned and supported in the thickness direction, and laser-welded to obtain the saw blade 3.

Further, in FIG. 12 , a concave portion 10b is formed in the thickness direction of the cutting edge tip 2 and a convex portion 10a is formed on the base metal 1,
An example is shown in which the protrusion 10a is fitted in the recess 10b, positioned and supported in the thickness direction, and laser-welded to obtain the saw blade 3.

Further, FIG. 13 shows an example in which the convex portion 10a has a dovetail convex shape in which the tip side is wide, and the concave portion 10b has a dovetail concave shape in which the depth of the groove is wider than the groove entrance. ,
In this case, the convex portion 10a is fitted into the concave portion 10b to perform the positioning support in the circumferential direction in a state where the positioning support is provided in the width direction, the positioning support of the cutting edge tip 2 can be performed accurately and firmly, and the bonding strength is also strong. Will be things.

[0025]14,Figure 15In yet another embodiment of the present invention
The morphology is shown. In the present embodiment, the cutting edge tip
Multiple cutting edge tips 2 formed by integrating two or more 2
An example using A is shown,14The tip 2
Uses two blade tips 2A formed by integrating two
Example is given,Figure 15Has 4 blade tips 2
An example using four consecutive cutting edge tips 2A formed by
There is. Of course, three blade tips 2 are integrated.
It is also possible to use 5 or more integrated ones.
It And, as mentioned above, two or more blade tips 2 are integrated.
The plurality of continuous cutting edge tips 2A formed by forming the concave shape of the base metal 1
To the positioning support 414(A) orFigure 15
From the state of (a)14(B) orFigure 15As in (b)
It is inserted into the positioning support part 4 and is clamped by the front and rear edges of the positioning support part 4.
By doing so, it is temporarily held in the positioned state.
Place the blade tip 2 on the positioning support 4 of the base metal 1 as shown in
Place the blade tip 2 into the base metal 1 while supporting it and temporarily holding it.
By laser welding14(C) orFigure 15As in (c)
It is to join. Here, a plurality of blade tips 2A
A large number of blade tips 2 to be integrated to configure
in case ofFigure 15As shown in the figure, multiple heat dissipation holes 5 are also provided for welding.
For better heat dissipation at
To As in this embodiment, two or more blade tips 2
Use a plurality of blade tips 2A integrally formed
And positioning of the blade tip 2 on the base metal 1 and the number of joinings is small
It will disappear. Here, two or more blade tips 2
The base metal 1 has a plurality of blade tips 2A integrally formed.
It is fitted into the positioning support 4 and is positioned and supported for welding.
In mounting, various attachments described in each of the above embodiments are performed.
Of course, the structure can be adopted.

FIG . 16 shows still another embodiment of the present invention. In the present embodiment, a plurality of holes are formed in the circumferential direction in the vicinity of the outer peripheral end of the base metal 1, and the holes are positioned by the positioning support portion 4.
Is shown. As shown in FIG. 16A, the hole serving as the positioning support portion 4 has such a hole shape that the upper and lower sides and the front and rear sides of the blade tip 2 are supported (that is, the blade tip 2 is surrounded and supported). I'm doing it. As shown in FIG. 16 (b), the blade tip 2 is fitted into the positioning support portion 4 and sandwiched and supported in the front-rear direction and the vertical direction to perform positioning support in the circumferential direction and the radial direction. In the temporarily fixed state in which the blade tip 2 is positioned and supported, a portion to which a load is applied when using the saw blade 3 as shown in FIG. 16C is welded by laser welding. After welding
The portion indicated by hatching cut off by a press punching or laser cutting in FIG. 16 (d), the FIG. 16 (e)
As shown in FIG. 5, the saw blade 3 is obtained by exposing the blade tip portion of the blade tip 2 to the outer peripheral portion of the base metal 1 and forming the heat dissipation hole 5. In the present embodiment, the heat dissipation holes 5 may be formed at the same time when the positioning support portion 4 is formed in the circumferential direction near the outer peripheral end portion of the base metal 1. In this embodiment, since the laser welding is performed in a state where the blade tip 2 is sandwiched and supported from the front-rear direction and the vertical direction,
Distortion and deformation due to heat during laser welding are prevented, and dimensional accuracy after joining is stabilized.

[0027]FIG. 17Shows another embodiment of the present invention.
I am doing it. In this embodiment,FIG. 17State of (a)
FromFIG. 17Positioning with a concave shape of the base metal 1 as shown in (b)
Positioning support part 4 by fitting cutting edge tip 2 into support part 4
Temporarily held in the positioned state by sandwiching it by the front and rear edges
Then, the blade tip 2 is spotted on the base metal 1.
Laser welding for temporary fixing (in the figure, 13a is
Laser welds for temporary fixing are shown), thenFIG. 17
Is there a load when using the saw blade 3 as in (c)?
The parts to be welded are welded by laser welding. This one too
In the case of the positioning support part 4 having a concave shape of the base metal 1,
Is the front and rear edge of the positioning support portion 4 by fitting the blade tip 2
In the state that it is sandwiched and temporarily held by the
Laser melting for temporary fixing to the base metal 1 in a spot state
Since they are in contact with each other, the positioning and support during the main welding are reliable and
The method accuracy is stable. Here, insert the tip 2
Laser melting for temporary fixing to the base metal 1 in a spot state
When making contact, temporary fixing in the circumferential and radial directions
to be able to do,FIG. 17After the cutting edge tip 2 as shown in (b)
The part and the lower part are welded in a spot shape.

[0028]FIG.As described above, mount the cutting edge tip 2
Laser welding for temporary fixing to gold 1 in spot state
Another embodiment is shown. In this embodiment
The cutting edge of the base metal 1 to the positioning support portion 4 having a concave shape.
And push it in and hold it by the front and rear edges of the positioning support 4.
By doing so, the blade tip is temporarily held and the cutting edge tip
2 to the base metal 1 in the spot state with the laser as a temporary fixing
The welding is done in this wayFIG.Multiple as in (b)
Alternatively, all of the cutting edge tips 2 are placed on the positioning support portions 4, respectively.
Temporarily fixed (in this case, the cutting edge tip 2 to the positioning support 4
Is temporarily held by laser welding.
When performing with the cutting edge tip 2, or with multiple or all blades
A plurality of tips 2 are temporarily held on the positioning support 4
Or temporarily fix all the cutting edge tips 2 at once by laser welding.
It can be either), then,FIG.
As shown in (c), a plurality or all of the blade tips 2 are temporarily fixed.
Is fixed by laser welding at once. like this
By doing so, the positioning and support at the time of the main welding is reliable, and
The method accuracy is stable, and the time required for fixation is shortened.
It is a thing.

FIG . 19 shows another embodiment in which the blade tip 2 is laser-welded as a temporary fixing to the base metal 1 in the spot state as described above. In this embodiment, the blade tips 2 are respectively fitted into the plurality of concave positioning support portions 4 of the base metal 1 and sandwiched by the front and rear edges of the positioning support portions 4 to temporarily hold them in the positioned state, and then, 19 (a), (b),
As shown in (c), one blade tip 2 is laser-welded for one spot welding and temporarily fixed (in the figure, 13a shows a temporary welded portion by the first one spot welding), and the next blade tip. Similarly, all the cutting edge tips 2 are welded one spot at a time so as to be temporarily fixed by welding one spot by welding 2 similarly to the next cutting edge tip 2 and similarly fixedly welding the next blade tip 2 by one spot welding. After that, from the second spot, similarly, one spot for each blade tip 2 is welded in the same manner, and finally all the blade tips 2 are welded at once through FIGS. 19 (d) and 19 (e). It is something to do.
In this embodiment, it is difficult for the cutting edge tip 2 to store heat, and even the cutting edge tip 2 made of high carbon steel or the like is not annealed. Further, the thermal expansion at the time of joining can be suppressed.

[0030]Figure 20Shows another embodiment of the present invention.
There is. In the present embodiment, in each of the above embodiments
And position and support the blade tip 2 on the base metal 1.
When joining by the welding, for exampleFigure 20(A)
Insert the cutting edge tip 2 into the positioning support 4
In the state that it is clamped from the rear direction and positioned and supported,Figure 20
As shown in (b) and (c), the table is supported from both sides by the support jig 40.
Hold and support gold 1 and blade tip 2 in this stateFigure 2
0Irradiate the laser 12 as shown in (b)Figure 20(D)
Laser welding such as continuous spot welding
OrFigure 20One-shot welding with laser as in (e)
The main welding is performed, but at this time, the base metal 1 and the blade tip
The support jig 40 of the same material and shape from both sides
Support, from both sidesFigure 20Laser 1 at the same time as in (b)
It is characterized by irradiating 2 and laser welding. like this
Laser welding by simultaneously irradiating the laser 12 from both sides.
By doing so, welding distortion can be reduced and welding can be performed accurately.
Become.

FIG . 21 shows still another embodiment of the present invention. In this embodiment, the support jig 40 is inserted from both sides.
In terms of support, but can be welded by irradiating simultaneously laser 12 from both sides is the same as the embodiment shown in FIG. 20, that is, although the embodiment basically shown in FIG. 20 is the same, the support jigs The feature is that the portion 40a near the welded portion of the tool 40 is formed of a material having poor heat conduction. That is,
The portion 40a near the welded portion of the support jig 40 is made of a material having poor heat conduction, for example, die steel, and the other portion of the support jig 40 is made of a material having good heat conduction, for example, copper. Then, by simultaneously irradiating the laser 12 from both sides to perform laser welding, the welded portion 13 is joined while being tempered. By tempering the welded portion 13 in this manner, the height of the welded portion 13 is increased. Toughening can be achieved.

FIG . 22 shows still another embodiment of the present invention. In this embodiment, the support jig 40 is inserted from both sides.
It is the same as the embodiment shown in FIG. 20 that the laser 12 is irradiated from both sides at the same time, that is, it is basically the same as the embodiment shown in FIG. By controlling the irradiation waveform of the laser 12 for irradiation, the welded portion 13 is tempered so as to have high toughness. That is irradiated with a laser 12 from both sides as shown in FIG. 22 (a) Upon welding as shown in FIG. 22 (b), the laser waveform when performing laser welding, FIG. 22
As shown in (c), a waveform (for example, a short waveform) that serves as energy for melting the joining portion by the laser and a waveform that gradually cools the solidified portion of the melting portion (for example, gradually reduces the magnitude of energy). The waveform is a composite waveform.

FIG . 23 shows still another embodiment of the present invention. In this embodiment, the support jig 40 is inserted from both sides.
It is the same as the embodiment shown in FIG. 20 that the laser 12 is irradiated from both sides at the same time, that is, it is basically the same as the embodiment shown in FIG. As the laser 12 to be irradiated, a laser 12a for welding the joint portion and a laser 12b for gradually cooling for tempering are used, and two head lasers are used to perform irradiation from both sides, respectively, and simultaneously perform tempering while welding. It is characterized by this. That is, as shown in FIG.
A laser 12a for melting the joint portion and a laser 12b for gradual cooling are used together from both sides to simultaneously weld and simultaneously temper the welded portion 13 to increase the toughness. Here, when performing laser welding, one head is used to melt the cutting edge tip 2 and the base metal 1 (for example, only for a waveform that can obtain deep penetration with a short pulse), and the other head is irradiated by the head. It is used to gradually cool the heated portion (only for the waveform that heats with a long pulse), and FIG. 23 (b) shows a graph showing the relationship between the energy of the waveform for melting the joint and time . 23 (c) is a graph showing the relationship between the energy of the waveform for slow cooling and time.

By the way, in a saw blade which normally cuts wood, as shown in FIG. 26 , a side scooping angle (indicated by α in FIG. 26 ) so that one side edge of the blade tip 1 projects in the cutting direction . for a While a provided structure, in this compound, the protrusion of the cutting direction is only one end, Fig.
26 When cutting in the order of (a)->(b)->(c)-> (d), the cutting edge tip 1 immediately comes up and "burrs" or "burrs" occur in a shape that turns up to the other end. Resulting in.
In other words, the blade tip 2 having the next reverse scooping angle cannot prevent the “flicker” and “burr” that occur in the front blade tip 2. Therefore, as in the embodiment shown in FIG. 24 , by making the shape of the cutting edge tip 2 into a V shape or a U shape in the cutting direction, the leading edge portion of the cutting edge portion is a cutting edge such that both side edges of the cutting edge portion are cutting blades. When cutting with the V-shaped or U-shaped cutting edge tip 2 shown in FIG.
The cutting is performed as shown in (a) → (b), and the occurrence of “fluff” and “burr” is prevented. When joining the blade tip 2 having such a shape and the base metal 1,
If the joining accuracy is poor, the cutting resistance becomes large, but as described above, by adopting each of the above-described embodiments of the present invention, the joining accuracy of the blade tip 2 to the base metal 1 is good, so that the blade tip 2 Even if the front edge of the cutting edge portion is V-shaped or U-shaped in the cutting direction, the cutting resistance does not increase. The arrows in FIGS . 25 and 26 indicate the cutting direction.

[0035]

As described above, according to the first aspect of the present invention, in the saw blade in which the blade tip is joined to the base metal as described above, the recess for positioning and supporting the blade tip on the base metal is provided.
-Shaped positioning support is provided, and the cutting edge is attached to the positioning support.
Insert the chip and hold it by the front and rear edges of the positioning support
Then, the side that is loaded during cutting is laser-welded to the base metal.
Front in the circumferential direction that does not apply a load when joining and cutting
Side support by abutting by the front edge of the positioning support
Positioning support that is the side that is not loaded when cutting
Since a heat dissipation hole is provided in the front part of the bottom part and next to the welding part, it can be joined to the base metal by laser welding or the like while the blade tip is positioned and supported by the positioning support part.
It is possible to join with high precision, and by joining the side to which the load is applied during cutting even to the base metal and supporting the side that is not loaded during cutting with a supporting force that is smaller than the side to which the load is applied. It is possible to shorten the time required for, and since the heat dissipation hole is provided in the joint, the heat generated during welding and cutting can be dissipated from the heat dissipation hole provided in the joint, preventing deformation due to heat, The cutting resistance can be reduced and good cutting can be performed.

In addition to the effect of the invention described in claim 1, in the invention described in claim 2, in addition to the effect of the invention described in claim 1, one surface of the joining portion between the base metal and the blade tip has a radial direction of the blade tip with respect to the base metal. Since the concavo-convex portion for positioning in the circumferential direction is provided, the blade tip can be accurately positioned in the radial direction and the circumferential direction, and a saw blade joined with high precision can be provided.

According to the invention of claim 3, in addition to the effect of the invention of claim 1 or claim 2, no load is applied during cutting by the cutting edge tip of the positioning support portion provided on the base metal. Since a spring is provided at the side portion and the blade tip that is fitted into the positioning support portion is pressed and supported by the spring, the blade tip can be easily and reliably positioned and supported by the spring, and the saw blade is joined accurately. Can be provided .

Further, in the invention described in claim 4 , in addition to the effect of the invention described in any of claims 1 to 3 , the base metal and the cutting edge tip are positioned relative to each other in the thickness direction. Since the concavo-convex fitting portion for forming is formed, positioning in the thickness direction can be performed easily and reliably, and a saw blade joined with high precision can be provided.

According to the invention of claim 5 , in addition to the effect of the invention of claim 1, a vibration absorbing material is provided at the joint between the blade tip and the base metal on the side not loaded during cutting. Since it is interposed, the vibration absorbing member absorbs the vibration during cutting, the vibration during cutting is reduced, the cutting resistance is reduced, and the cutting width is narrow .

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 (a) is a front view of a base metal used in the above,
(B) is a perspective view of an example of a cutting edge tip.

FIG. 3 (a) is an exploded front view of the same cutting edge tip before being fitted into a positioning support portion of a base metal, and FIG. 3 (b) is a perspective view of the same cutting edge tip being fitted into a positioning support portion of a base metal and temporarily supported. It is a front view of a state.

FIG. 4 is an explanatory view showing an example in which the above laser is irradiated to perform welding.

FIG. 5 is a front view of another embodiment of the present invention.

FIG. 6 (a) is an exploded front view of the same cutting edge tip before it is fitted into a positioning support portion of a base metal, and FIG. 6 (b) is a similar view of FIG. It is a front view of a state.

FIG. 7 is a front view of still another embodiment of the present invention.

FIG. 8 (a) is an exploded front view of the same cutting edge tip before being fitted into a positioning support portion of a base metal, and FIG. 8 (b) is a perspective view of the same cutting edge tip being fitted into a positioning support portion of a base metal for temporary support. It is a front view of a state.

FIG. 9 shows another embodiment of the present invention, in which (a) is positive.
It is a side view and (b) is a side view.

FIG. 10 shows another embodiment of the present invention .
To (d) is an explanatory view showing the joining order.

FIG. 11 shows still another embodiment of the present invention, in which FIG.
To (c) is an explanatory view showing the joining order.

FIG. 12 shows another embodiment of the present invention .
To (c) is an explanatory view showing the joining order.

FIG. 13 shows still another embodiment of the present invention, in which FIG.
To (c) is an explanatory view showing the joining order.

FIG. 14 shows still another embodiment of the present invention, including (a)
To (c) is an explanatory view showing the joining order.

FIG. 15 shows still another embodiment of the present invention, including (a)
To (c) is an explanatory view showing the joining order.

FIG. 16 shows another embodiment of the present invention .
To (e) is an explanatory view showing the joining order.

FIG. 17 shows still another embodiment of the present invention, including (a)
To (c) is an explanatory view showing the joining order.

FIG. 18 shows still another embodiment of the present invention, including (a)
To (c) is an explanatory view showing the joining order.

FIG. 19 shows still another embodiment of the present invention, including (a)
To (e) is an explanatory view showing the joining order.

FIG. 20 shows still another embodiment of the present invention, in which (a) is
It is a front view which shows the temporary support state of the blade tip, (b) is
It is a plane sectional view showing a state of laser welding,
(C) is a front view showing a state of being supported by a supporting jig,
(D) and (e) are examples of joining by laser welding.
It is an explanatory view shown.

FIG. 21 shows still another embodiment of the present invention, in which (a) is
It is a front view which shows the temporary support state of the blade tip, (b) is
It is a front view of the state where it is supported by a support jig, and (c) is
It is explanatory drawing of the joining state by laser welding.

FIG. 22 shows still another embodiment of the present invention, in which (a) is
It is a plane cross-sectional view of the state where laser welding is performed.
It is an explanatory view of the joining state by laser welding, (c) is a laser
It is a graph which shows the waveform.

FIG. 23 shows still another embodiment of the present invention, in which (a) is
It is a horizontal cross-sectional view of the state of laser welding, (b) is a connection
It is a graph showing a laser waveform for melting the joint,
(C) is a graph of a laser waveform for slow cooling.

FIG. 24 is an oblique view showing another example of the cutting edge tip used in the present invention .
It is a perspective view.

25 (a) and 25 (b) are saws using the same cutting edge tip.
It is explanatory drawing which shows the cutting order by a blade.

26 (a) to 26 (d) show different blade tips of the blade tips.
It is explanatory drawing which shows the cutting order in another example.

[Explanation of symbols]

1 Metal 2 Blade tip 3 Saw blade 4 Positioning support 5 Heat dissipation hole 6 Concavo-convex portion 7 Spring 8 Projection 10 Concavo-convex fitting portion 11 Vibration absorber

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noboru Kusano 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (72) Inventor, Hidesumi Okamura, 1048, Kadoma, Kadoma City, Osaka Prefecture (72, Matsushita Electric Works, Ltd.) ) Inventor Masao Kubo 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd. (56) Reference JP 59-24914 (JP, A) JP 61-185403 (JP, A) JP 57- 156124 (JP, A) Actual development Sho 64-70820 (JP, U) Actual development Sho 62-113636 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23D 61/00 B27B 33 / 00

Claims (5)

(57) [Claims] 1. A saw blade, in which a blade tip is joined to a base metal, is provided with a concave shape for positioning and supporting the blade tip on the base metal.
Were positioning support portions provided, the cutting edge chip to the positioning support part
The front and rear edges of the positioning support
Laser welding is used to join the load-bearing side to the base metal during cutting
On the front side in the circumferential direction so that no load is applied when cutting
At the front edge of the positioning support part, it abuts and supports,
Bottom of positioning support, which is the side that is not loaded when cutting
A saw blade, characterized in that a heat dissipation hole is provided in the front part of the part and adjacent to the welded part . 2. A concavo-convex portion for positioning the blade tip in the radial direction and the circumferential direction with respect to the base metal is provided on one surface of the joint between the base metal and the blade tip. Saw blade. 3. A positioning support portion provided on the base metal is provided with a spring at a portion where a load is not applied at the time of cutting by the cutting edge tip, and the spring tip presses and supports the cutting edge tip fitted in the positioning support portion. The saw blade according to claim 1 or 2. 4. A base metal and a cutting edge tip in the thickness direction of each other.
Forming a concave-convex fitting part for positioning
The saw according to any one of claims 1 to 3, characterized in that
blade. 5. The cutting edge chip on the side not loaded during cutting.
Vibration absorber at the joint between the base and the base metal.
The saw blade according to claim 1, wherein: