JPH09201720A - Saw-tooth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a deformation by the heat in a welding time or in a cutting time, so as to reduce the cutting resistance, and to make the positioning at the jointing condition and to joint accurately, by carrying out the heat radiation sufficiently in the welding time and the cutting time. SOLUTION: A saw-tooth 3 is made by jointing an edge chip 2 to a base metal 1, and a positioning support 4 to position and support the edge chip 2 to the base metal 1 is provided. While the load applying side of the edge chip 2 positioned and supported by the positioning support 4 is jointed to the base metal 1, the no load applying side is supported by a supporting force smaller than the load applying side. A heat radiating hole 5 is formed at the joint of the edge chip 2 of the base metal 1.

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 conventional example, and can sufficiently dissipate heat when welding or cutting by using it as a saw blade to prevent deformation due to heat during welding or cutting. It is an object of the present invention to provide a saw blade which can be prevented to reduce the cutting resistance, can be positioned at the time of joining, can be joined accurately, and can be joined in a short time.

[0005]

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, a positioning support portion 4 for positioning and supporting the blade tip 2 on the base metal 1 is provided.
The blade tip 2 which is positioned and supported by the positioning support portion 4 is joined to the base metal 1 on the side on which a load is applied during cutting and on the side not loaded during cutting with a supporting force smaller than that on the side under load. A heat dissipation hole 5 is formed at a joint portion of the base metal 1 with the blade tip 2. 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, and the side to which the load is applied at the time of cutting is joined to the base metal 1 even when joining. At the same time, by supporting the unloaded side at the time of cutting with a supporting force smaller than that of the loaded side, the time required for joining can be shortened. 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 an uneven portion 6 for positioning the blade tip 2 with respect to the base 1 in the radial direction and the circumferential direction 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 with the blade tip 2, and the spring tip 7 presses and supports the blade tip 2 fitted in the positioning support portion 4. Is also preferable. With such a configuration,
With the simple structure of the spring 7, it is possible to support and position the part on the side on which the load is not applied when the blade tip 2 is cut.

Further, a protruding portion 8 protruding in the circumferential direction of the base metal 1 is provided at a portion where no load is applied when the cutting edge tip 2 is cut, and the protruding portion 8 is surrounded by a pressing portion 9 provided on the base metal 1. It is also preferable to support by pressing in a direction intersecting the direction. With such a configuration, the protrusion 8 provided at a portion where no load is applied when the cutting edge tip 2 is cut is pressed by the pressing portion 9 to be reliably supported in the radial direction for positioning.

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 such a structure, the vibration when used as a saw blade for cutting can be absorbed by the vibration absorber 11 to reduce the vibration.

Also, the side to which the load is applied at the time of cutting is joined,
It is also preferable that the unloaded side at the time of cutting is joined by the same joining means as the loaded side and the joining force on the unloaded side at the time of cutting is made smaller than the joining force on the loaded side at the time of cutting. With such a structure, the bonding strength can be increased.

[0010]

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,
As shown in FIG. 2A, the base metal 1 has a disk shape, and a large number of concave positioning support portions 4 are provided on the outer peripheral portion of the disk base metal 1. This base metal 1 is SK5, S
It is made of KS51 or the like and is processed by press molding.
A heat dissipation hole 5 is formed in the front part of the bottom of each positioning support part 4 with respect to the base metal 1 (the front side in the cutting direction when used as the saw blade 3 is the front part).

The blade 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 to temporarily hold it 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, the blade tip 2 made of a material requiring heat treatment such as high alloy steel is required because heating is required in the joining process. 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 dissipation 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.

FIGS. 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. 6 (b).
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.

9 and 10 show still another embodiment of the present invention. In this embodiment, FIG.
As shown in (a), a projecting portion 8 projecting in the circumferential direction of the base metal 1 is provided at a portion where a load is not applied when the cutting edge tip 2 is cut, and the positioning support portion 4 provided on the base metal 1 is provided. A pressing portion 9 is provided so as to project downward on the upper portion of the front edge portion. Then, as shown in FIG. 10B, the cutting edge tip 2 is fitted into the positioning support portion 4 and is sandwiched from the front and the back for positioning support (in this case, in the embodiment, the convex portion 6a is further provided.
When the projection 8 is fitted into the recess 6b for positioning, the projection 8 is elastically pressed toward the approximate center of the base metal 1 to temporarily support the projection 8. Thus, the positioning is performed. In a supported state, the blade tip 2 is joined to the base metal 1 by laser welding to obtain a saw blade 3 as shown in FIG. Then, when the cutting edge tip 2 is fitted into the positioning support portion 4 and sandwiched from the front and the back to be positioned and supported, the projection portion 8 is pressed by the pressing portion 9 in a direction intersecting the circumferential direction of the base metal 1, so that during laser welding. It is designed to prevent distortion and deformation due to heat. In the present embodiment, the pressing portion 9 is a part of the base metal 1, and the elastic pressing portion 9 is formed by integrally projecting the elastic protruding piece whose tip is a free end from the base metal 1. I am configuring.

FIG. 11 shows still another embodiment of the present invention. As shown in FIG. 11A, the blade tip 2 is fitted into the concave positioning support portion 4 of the base metal 1 and is sandwiched from the front and rear to be temporarily held in a positioned state. In this case, in the present embodiment, cutting is performed. Occasionally, the vibration absorbing material 11 is press-fitted and interposed at the joint between the blade tip 2 and the base metal 1 on the side where no load is applied. 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. It is joined to the gold 1 by laser welding as shown in FIG. 11 (b). By interposing the vibration absorbing material 11 in this way, the vibration at the time of cutting can be absorbed by the vibration absorbing material 11 to reduce the vibration.

FIG. 12 shows still another embodiment of the present invention. In the embodiment shown in FIG. 1, only the side to which the load is applied when cutting with the saw blade 3 is welded, and the side of the joint where no load is applied when cutting with the saw blade 3, that is, the front side in the circumferential direction is the base metal. The saw blade 3 is supported by abutting the front edge portion of the positioning support portion 4 provided in the first embodiment. However, in the present embodiment, the side to which the load is applied at the time of cutting by the saw blade 3 is welded, and further, among the joint portions. Even on the side where no load is applied during cutting with the saw blade 3, that is, on the front side in the circumferential direction, the welding strength can be increased by laser welding as shown in FIG. In this case, the welded portion 13 'on the side where no load is applied during cutting (that is, the front portion of the blade tip 2) is larger than the joint length of the welded portion 13 on the side where the load is applied during cutting with the saw blade 3 (that is, the rear portion of the blade tip 2). By shortening the joint length of, the supporting force at the joint on the side where the load is not applied is made smaller than that at the side where the load is applied. Here, the joining strength can be controlled by changing the joining length of the welded portion 13 ′ on the unloaded side, which is effective for the saw blade 3 for cutting a hard material which is heavily loaded during cutting. Further, it is not necessary for a soft material that does not receive a large load when cutting.

13 to 16 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-convex fitting portion 10 for positioning the base metal 1 and the cutting edge tip 2 in the mutual thickness direction, for example, FIG. 13, FIG. 14, FIG. 15, FIG.
Embodiments such as No. 6 are possible. In FIG. 13, a stepped protrusion 10a is formed in the thickness direction of the cutting edge tip 2, a stepped recess 10b is formed on the base metal 1, and a stepped protrusion 1 is formed.
0a is fitted into the stepped recess 10b for positioning and supporting in the thickness direction (in this case, although not shown, the cutting edge tip 2 has the positioning supporting portion 4 as in each of the above-described embodiments). It is fitted in and is clamped from the front and back to be positioned), thus, in the circumferential direction, the radial direction,
A laser 12 is irradiated in a state of being positioned and supported in the thickness direction and a saw blade 3 is obtained by irradiating a laser 12 as shown in FIG. 13C and joining the blade tip 2 to the base metal 1 by laser welding as shown in FIG. 13D. Is.

In FIG. 14, a convex portion 10a is formed in the thickness direction of the cutting edge tip 2, a concave portion 10b is formed in the base metal 1, and a convex portion 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. 15, a concave portion 10b is formed in the thickness direction of the cutting edge tip 2, a convex portion 10a is formed in the base metal 1, and the convex portion 10a is fitted in the concave portion 10b to position and support the laser in the thickness direction. An example is shown in which the saw blade 3 is obtained by welding.

Further, FIG. 16 shows an example in which the convex portion 10a has a dovetail convex shape in which the front end side is wide, and the concave portion 10b has a dovetail concave shape in which the groove depth 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.

17 and 18 show another embodiment of the present invention. In this embodiment, a plurality of blade tips 2 formed by integrating two or more blade tips 2 together.
An example using A is shown, and in FIG. 17, the cutting edge tip 2 is used.
An example of using two blade tips 2A formed by integrating two blade tips is shown, and FIG. 18 shows an example of using four blade tips 2A formed by integrating four blade tips 2 together. . Of course, one in which three blade tips 2 are integrated or one in which five or more blade tips are integrated may be used. A plurality of blade tips 2A formed by integrating two or more blade tips 2 as described above are provided in the concave positioning support portion 4 of the base metal 1 as shown in FIG.
17 (b) or 18 (b) is inserted from the state of (a), and is clamped by the front and rear edges of the positioning support portion 4 to be temporarily held in the positioned state. The blade tip 2 is positioned and supported by the positioning support portion 4 of the base metal 1 and is temporarily held, and the blade tip 2 is mounted on the base metal 1.
17C or 18C by laser welding. Here, a plurality of blade tips 2A
When there are a large number of blade tips 2 to be integrated in order to configure the above, a plurality of heat dissipation holes 5 are also provided as shown in FIG. 18 so that heat dissipation during welding and heat dissipation during cutting can be favorably performed. When a plurality of blade tips 2A formed by integrating two or more blade tips 2 as in the present embodiment is used, the number of positioning and joining of the blade tips 2 to the base metal 1 is reduced. Here, when a plurality of consecutive cutting edge tips 2A formed by integrating two or more cutting edge tips 2 are fitted into the positioning support portion 4 of the base metal 1 to perform positioning support, and welding, various types described in each of the above-described embodiments are described. Needless to say, the mounting structure of can be adopted.

FIG. 19 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. 19A, the hole serving as the positioning support portion 4 has a hole shape such that the upper and lower sides and 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. 19B, the blade tip 2 is fitted into the positioning support portion 4 and sandwiched and supported in the front-rear direction and the up-down 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, as shown in FIG. 19C, a portion to which a load is applied when the saw blade 3 is used is welded by laser welding. After welding,
The part indicated by hatching in FIG. 19D is cut off by press punching, laser cutting, or the like, and FIG.
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.

FIG. 20 shows still another embodiment of the present invention. In the present embodiment, as shown in FIG. 20 (a), as shown in FIG. 20 (b), the blade tip 1 is fitted into the concave positioning support part 4 of the base metal 1 to position the positioning support part 4.
The blade tip 2 is temporarily held in the positioned state by being sandwiched by the front and rear edges, and then the blade tip 2 is spot welded to the base metal 1 by laser welding as a temporary fixing (in the figure, 13a is a laser welding as a temporary fixing). 20), and then FIG.
As shown in (c), a portion to which a load is applied when used as the saw blade 3 is welded by laser welding. In this case, the blade tip 2 is fitted into the concave positioning support portion 4 of the base metal 1 and sandwiched by the front and rear edges of the positioning support portion 4 and temporarily held, and the blade tip 2 is further attached to the base metal 1. On the other hand, since laser welding for temporary fixing is performed in the spot state, the positioning and support at the time of main welding are reliable, and the dimensional accuracy is stable. Here, when performing laser welding for temporary fixing of the cutting edge tip 2 to the base metal 1 in a spot state, as shown in FIG. 20 (b), the cutting edge tip can be temporarily fixed in the circumferential direction and the radial direction. The rear part and the lower part of 2 are welded in a spot shape.

FIG. 21 shows another embodiment in which the cutting edge 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 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 to temporarily hold the blade tip 2 in a positioned state, and the blade tip 2 is also supported by the base metal 1. Laser welding as a temporary fixing in a spot state, and in this way, a plurality or all of the blade tips 2 are temporarily fixed to the positioning support 4 as shown in FIG. 21B (in this case, the blade tips). Positioning support 4
When temporarily fixing by laser welding with one blade tip 2 temporarily held in place, or when a plurality or all of the blade tips 2 are temporarily held by the positioning support part 4, a plurality of or all the blade tips 2 are temporarily held. It does not matter which is the case of temporarily fixing by laser welding at a time).
As shown in (c), a plurality or all of the blade tips 2 temporarily fixed
Is fixed by laser welding at once. By doing so, the positioning and support at the time of the main welding are reliable, the dimensional accuracy is stable, and the time required for fixing is shortened.

FIG. 22 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, 22 (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, similarly from the second spot, one spot is welded for each blade tip 2 in the same manner, and finally, all the blade tips 2 are welded at once through FIGS. 22 (d) and (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.

FIG. 23 shows still another embodiment of the present invention. In the present embodiment, in each of the above embodiments, when the positioning-supported blade tip 2 is joined to the base metal 1 by laser welding, for example, the blade tip 2 is mounted on the positioning support portion 4 as shown in FIG. In the state of being fitted and sandwiched from the front-rear direction for positioning support, FIG.
As shown in (b) and (c), the base 1 and the cutting edge tip 2 are sandwiched and supported by the support jigs 40 from both sides, and in this state, as shown in FIG.
The main welding in which the laser 12 is irradiated as shown in FIG. 3 (b) and the laser spot welding is continuous as shown in FIG. 23 (d), or the one-shot welding with laser is performed as shown in FIG. In this case, welding is performed. At this time, the base metal 1 and the cutting edge tip 2 are supported from both sides by the supporting jig 40 having the same material and the same shape, and the laser 1 is simultaneously applied from both sides as shown in FIG.
It is characterized by irradiating 2 and laser welding. In this way, by simultaneously irradiating the laser 12 from both sides to perform laser welding, welding distortion is small and accurate welding can be performed.

FIG. 24 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. 23 that the laser 12 is irradiated from both sides at the same time as the embodiment shown in FIG. 23, that is, basically the same as the embodiment shown in FIG. 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. 25 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. 23 that the laser 12 is irradiated from both sides at the same time as the embodiment shown in FIG. 23, that 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, when the laser 12 is irradiated from both sides as shown in FIG. 25A and welding is performed as shown in FIG. 25B, the laser waveform at the time of laser welding is as shown in FIG.
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. 26 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. 23 that the laser 12 is irradiated from both sides at the same time as the embodiment shown in FIG. 23, that 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. FIG. 26 (b) is a graph showing the relationship between the energy of the waveform for melting the joint portion and the time, which is used for gradually cooling the formed portion (only for the waveform of heat input by long pulse). 26 (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 for cutting normal wood, as shown in FIG. 29, a side scooping angle (indicated by α in FIG. 29) so that one side edge of the blade tip 1 projects in the cutting direction. However, in this structure, since the protrusion in the cutting direction is only at one side end, when cutting is performed in the order of FIG. 29 (a) → (b) → (c) → (d). , Immediately, the cutting edge tip 1 comes up and flips up to the other side edge, and "burrs" and "burrs" occur.
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. For this reason, as in the embodiment shown in FIG. 27, by making the shape of the cutting edge tip 2 into a V shape or a U shape in the cutting direction, the front edge portion of the cutting edge portion is a cutting edge such that both side edges of the cutting edge portion are cutting blades. 28 when cutting with the V-shaped or U-shaped blade tip 2
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. 28 and 29 indicate the cutting direction.

[0033]

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, a positioning support portion for positioning and supporting the blade tip on the base metal. The blade tip that is positioned and supported by the positioning support is joined to the base metal on the side that is loaded during cutting, and the side that is not loaded during cutting is supported with a smaller supporting force than the side that is loaded. Since a heat dissipation hole is formed at the joint with the blade tip, the blade tip can be joined by laser welding or the like to the base metal while being positioned and supported by the positioning support portion, and it can be joined accurately. Yes, it is necessary to join by joining the side to which the load is applied at the time of cutting to the base metal even at the time of joining and supporting the side that is not loaded at the time of cutting with a supporting force smaller than the side to which the load is applied. The time can be shortened, 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 and cutting resistance. It is possible to reduce the number of cuts and perform good cutting.

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 cutting edge tip has a radial direction with respect to the base metal relative 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.

Further, in the invention of claim 3, in addition to the effect of the invention of claim 1 or claim 2, a load is not applied at the time of 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.

According to the invention of claim 4, in addition to the effects of the invention of claim 1 or claim 2, in the circumferential direction of the base metal, a portion where no load is applied at the time of cutting the blade tip is provided. By projecting a protruding protrusion and supporting the protrusion in a direction intersecting the circumferential direction by a pressing portion provided on the base metal, the blade tip can be easily and reliably positioned and supported by pressing by the protrusion. Therefore, it is possible to provide a saw blade that is joined with high precision.

According to the invention of claim 5, in addition to the effect of the invention of any one of claims 1 to 4, 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. Further, in the invention of claim 6, in addition to the effect of the invention of claim 1, a vibration absorbing material is interposed at the joint between the blade tip and the base metal on the side not loaded during cutting. Therefore, the vibration absorbing member absorbs the vibration at the time of cutting, the vibration at the time of cutting is reduced, the cutting resistance is reduced, and the cutting width is narrow.

According to the invention of claim 7, in addition to the effect of the invention of claim 1, the side to which the load is applied is joined at the time of cutting, and the side which is not loaded at the time of cutting is the side to which the load is applied. Since the joining force on the side that is not loaded during cutting is smaller than the joining force on the side that is loaded during cutting, the joining strength is improved, and the side that is not loaded during cutting is joined. The joining strength can be controlled by changing the joining force of, and various cutting applications can be achieved even with a fixed shape.

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

FIG. 10 (a) is an exploded front view of the blade tip of the same as before being fitted into a positioning support portion of a base metal, and FIG. 10 (b) is a perspective view of the blade tip as above being fitted into a positioning support portion of a base metal for temporary support. It is a front view of a state.

FIG. 11 shows still another embodiment of the present invention, (a) is a front view and (b) is a side view.

FIG. 12 is a front view of still another embodiment of the present invention.

FIG. 13 is a view showing still another embodiment of the present invention, in which (a) to (d) are explanatory views showing a joining order.

FIG. 14 shows still another embodiment of the present invention, in which (a) to (c) are explanatory views showing a joining order.

FIG. 15 is a view showing still another embodiment of the present invention, in which (a) to (c) are explanatory views showing a joining order.

FIG. 16 shows still another embodiment of the present invention, in which (a) to (c) are explanatory views showing a joining order.

FIG. 17 shows still another embodiment of the present invention, in which (a) to (c) are explanatory views showing the joining order.

FIG. 18 shows still another embodiment of the present invention, in which (a) to (c) are explanatory views showing the joining order.

FIG. 19 shows still another embodiment of the present invention, in which (a) to (e) are explanatory views showing the joining order.

FIG. 20 shows still another embodiment of the present invention, in which (a) to (c) are explanatory views showing the joining order.

FIG. 21 shows still another embodiment of the present invention, in which (a) to (c) are explanatory views showing the joining order.

FIG. 22 shows still another embodiment of the present invention, in which (a) to (e) are explanatory views showing the joining order.

FIG. 23 shows still another embodiment of the present invention, (a) is a front view showing a temporary support state of a cutting edge tip, and (b) is a plane sectional view showing a state where laser welding is performed. ,
(C) is a front view showing a state of being supported by a supporting jig,
(D) (e) is explanatory drawing which shows each example of joining by laser welding, respectively.

FIG. 24 shows still another embodiment of the present invention, (a) is a front view showing a temporary support state of a cutting edge tip, and (b) is a front view showing a state of being supported by a support jig. , (C) are explanatory views of a joined state by laser welding.

FIG. 25 shows still another embodiment of the present invention, (a) is a plan sectional view of a state where laser welding is performed, (b) is an explanatory view of a joined state by laser welding, and (c). Is a graph showing a laser waveform.

FIG. 26 shows still another embodiment of the present invention, (a) is a plane sectional view of a state where laser welding is performed, and (b) is a graph showing a laser waveform for melting a joint portion,
(C) is a graph of a laser waveform for slow cooling.

FIG. 27 is a perspective view showing another example of the cutting edge tip used in the present invention.

28 (a) and 28 (b) are explanatory views showing a cutting sequence by a saw blade using the same blade tip.

29 (a) to 29 (d) are explanatory views showing a cutting sequence in different examples of the blade tip portion of the blade tip.

[Explanation of symbols]

 1 base metal 2 blade tip 3 saw blade 4 positioning support 5 heat dissipation hole 6 uneven part 7 spring 8 protrusion 9 pressing part 10 uneven fitting part 11 vibration absorbing material

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Noboru Kusano 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Inventor, Hidesumi Okamura 1048, Kadoma, Kadoma, Osaka Prefecture (72) Inventor Masao Kubo 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (7)

[Claims] 1. A saw blade, in which a blade tip is joined to a base metal, is provided with a positioning support portion for positioning and supporting the blade tip tip on the base metal, and the blade tip that is positioned and supported by the positioning support portion is loaded at the time of cutting. Such a side is joined to a base metal, and a side which is not loaded at the time of cutting is supported by a supporting force smaller than that of the load-bearing side, and a heat dissipation hole is formed at a joint portion of the base metal with a blade tip. A saw blade. 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 protrusion projecting in the circumferential direction of the base metal is provided at a position where no load is applied when cutting the cutting edge tip, and the projection is provided in a direction intersecting the circumferential direction by a pressing portion provided on the base metal. The saw blade according to claim 1 or 2, wherein the saw blade is supported by pressing. 5. The saw according to claim 1, wherein the base metal and the cutting edge tip are formed with concave-convex fitting portions for mutually positioning in the thickness direction. blade. 6. The saw blade according to claim 1, wherein a vibration absorbing material is interposed at a joint portion between the blade tip and the base metal on a side where a load is not applied during cutting. 7. A side to which a load is applied at the time of cutting is joined, a side not to be loaded at the time of cutting is joined by the same joining means as a side to which a load is applied, and a joining force on a side not to be loaded at the time of cutting is loaded. The saw blade according to claim 1, wherein the saw blade is smaller than the joining force on the side.