JPH05401A - Chip saw - Google Patents

Abstract

PURPOSE:To provide a chip saw equipped with engineering plastic rotary CONSTITUTION:An engaging groove 8, by which a chip 5 is engaged with the outer peripheral part of the disk of the saw concerned at the bonding site of the chip, is formed on the outer peripheral surface of each of a plurality of cutting body chips 5 made of high hardness material. At the molding of the disk 1, by bringing the bonding site to each chip 5 of the disk 1 under molten or semi-molten state into close contact with the engaging groove of the chip 5, the chip 5 is integrally fixed to the disk 1 under the inseparable state. Thus, the lightening of the weight of the rotary disk 1 and the improvement of its mass-productivity are contrived and, at the same time, the resonance of the vibration of the chip at high speed cutting with the disk 1, the material of which is different from that of the chip, through transfer is prevented from developing, resulting in allowing to suppress metallic noise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip saw having a disc-shaped or polygonal-plate-shaped rotary pedestal to which a plurality of blade chips are fixed at predetermined intervals.

[0002]

2. Description of the Related Art Conventionally, in this type of tip saw, a rotary pedestal is formed of a metal plate such as a steel plate, and a blade tip formed of a high hardness material such as cemented carbide or ceramic is formed on the outer peripheral portion of the rotary pedestal. It is fixed at regular intervals, and has much better machinability than the conventional rotary blade with a blade body integrally engraved on the outer periphery of the rotary pedestal. Not only is it used as a rotary blade for machines and circular saws for woodworking and cutting outer wall materials, but in recent years,
It is also used for cutting metal materials.

[0003]

However, in the case of the conventional tip saw using the metal plate-made rotating base, when attached to a cutting machine and rotated at a high speed, the vibration during cutting causes the metal plate constituting the base to be vibrated. There is a problem that abnormally high metallic noise is generated by propagating, tuning, and resonating, and the working environment is significantly deteriorated.In particular, this metallic noise is more remarkable when cutting a hard work material. Is.

Further, the attachment of a plurality of blade tips to the outer peripheral portion of the rotary base made of a metal plate is usually performed by brazing each blade tip at a predetermined portion on the outer periphery of the base. Therefore, the larger the number of blade chips, the more labor and time is required for the brazing work. In addition, since the brazing portion with the blade tip of the rotary pedestal outer peripheral portion is locally heated, hardness unevenness occurs in one piece of the pedestal portion, there is a difficulty to chip, and after brazing the blade tip, Since it is unavoidable that distortion occurs at the joining point, the step of removing the distortion is necessary. As described above, in the case of the tip saw having the conventional configuration, there is a problem that the manufacturing cost is high because the manufacturing process is complicated and requires a lot of labor and time.

Further, since the rotary pedestal is made of a metal plate, the weight is inevitably large. For this reason, particularly in the case of being mounted on a hand-held cutting machine or the like, there is a disadvantage in that the work load becomes large due to the heavy tip saw.

The present invention has been made to solve the above problems all at once, and can suppress the generation of annoying metallic noise at high speed rotation as much as possible and simplify the manufacturing process. Is suitable for mass production, can be manufactured at low cost, and can be significantly reduced in weight, but its strength,
An object of the present invention is to provide a tip saw having excellent durability comparable to that of a conventional one using a metal plate rotary pedestal in terms of durability.

[0007]

In order to achieve such an object, the structure of the tip saw according to the present invention is, as shown in the drawings corresponding to the embodiments, a plate-like rotary pedestal having a circular shape or a polygonal shape. 1 is formed of engineering plastic having heat resistance.

On the other hand, a plurality of blade chips 5 made of a high hardness material disposed on the outer peripheral portion of the rotary pedestal 1 are provided on the outer peripheral surface of the rotary pedestal 1. It is assumed that an engaging portion to be locked is formed. The engaging portion formed on the outer peripheral surface of the blade tip 5 may be a combination of a convex portion, a concave portion protruding or recessed from the outer peripheral surface, or an uneven shape, or the outer peripheral surface of the blade tip 5. It is preferable that the entire shape of the joint portion of the surface with the rotary pedestal 1 is formed so as to be irremovably held in the outer peripheral joint portion of the rotary pedestal 1.

When the rotary pedestal 1 is molded, the joining portion of the pedestal 1 in a molten or semi-molten state with each blade tip 5 is connected to each engaging portion of the plurality of blade tips 5. These blade chips 5 are integrally fixed to the rotary pedestal 1 in a non-separable state by closely contacting each other. The fixation of each blade tip 5 to the rotary base 1 is
For example, when the rotary pedestal 1 is manufactured by injection molding, a plurality of blade chips 5 are arranged at predetermined positions, and the molten or semi-molten engineering plastic to be molded on the rotary pedestal 1 is attached to each blade chip 5. This can be achieved by joining the engaging portion in a close contact state.

[0010]

Since the rotary base 1 to which the blade tip 5 is fixed is made of engineering plastic having heat resistance, the weight of the base 1 can be reduced, and the base 1 can be formed by injection molding. Depending on the processing method, it becomes possible to mass-produce efficiently. Moreover, at the time of this molding, the outer peripheral joint surface of each blade tip 5 can be firmly adhered to the joint portion of the blade tip 5 on the outer peripheral portion of the pedestal 1.

Further, in this fixed state, the engaging portion formed on the joint surface of the blade tip 5 is integrally coupled to the outer peripheral joint surface of the rotary pedestal 1 in a non-separable state, so that each blade When cutting an object to which a strong external force is applied to the body tip 5, there is no danger of the blade tip 5 separating from the pedestal 1 and scattering. Due to the high heat resistance, the frictional heat generated between the blade tip 5 and the object to be cut at the time of cutting does not cause the joint surface portion of the pedestal 1 to be softened and deformed.

Further, during high-speed cutting of the tip saw, metallic noise due to vibration and resonance due to the same kind of metal is blocked by the dissimilar material between the blade tip 5 made of a high hardness material and the rotary pedestal 1 made of engineering plastic, and vibrated. Since tuning / resonance due to propagation to the pedestal 1 due to is avoided, noise generation during use can be suppressed as much as possible, and a quiet working environment can be realized.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. The tip saw of this embodiment shown in FIGS. 1 to 4 is used as a handheld electric cutter or a rotary blade of a circular saw, for cutting aerated concrete panels, shaped steel materials, metal-based or ceramic siding, etc. It is something.

1 to 3, reference numeral 1 denotes a disk-shaped rotary pedestal, which is made of engineering plastic. As the engineering plastic used for this pedestal 1, PEEK, which is a crystalline thermoplastic resin, has a high melting point (334 ° C), has a high heat resistance that can be used at 240 to 260 ° C, and has a large strength and is suitable for injection molding. It is a typical example in that it has suitable processability.

A boss portion 2 having a hole 2a for attaching to a cutting machine drive shaft is formed at the center of the rotary pedestal 1 so as to project from both sides of the pedestal 1, and the outer peripheral surface of the boss portion 2 is provided on both sides. A plurality of recessed grooves 3a, 3b extending radially from each are formed. As shown in FIG. 4, the concave grooves 3a and 3b integrally provided on both surfaces of the rotary base 1 are arranged on the one surface side and the other surface side of the base 1 with a certain phase difference in the base rotation direction. With such a configuration, the strength reduction and the molding distortion of the formation portions of the concave grooves 3a and 3b are suppressed as much as possible. Further, since the concave grooves 3a and 3b are radially arranged, the concave grooves 3a and 3b perform an air cooling action when the pedestal 1 is rotated, and the overheating of the pedestal 1 is effectively prevented. Is.

Further, U is provided at a plurality of outer peripheral portions of the rotary base 1.
The V-shaped notch recesses 4 are radially formed at regular intervals. Of the facing end surfaces 4a and 4b of each notch recess 4,
End face 4a which is the rear side of the pedestal rotation direction (direction of arrow a in FIG. 1)
The blade chips 5 are arranged on the respective sides.

These blade tips 5 are molded products made of a high hardness material such as cemented carbide or ceramics having excellent wear resistance, and the tip 6 of the blade projects from the outer peripheral surface of the rotary pedestal 1. A base end portion 7 continuous with the cutting edge portion 6 is held and fixed to the base 1.

That is, as shown in FIGS. 5 to 8, the blade tip portion 6 of the blade tip 5 is formed in a triangular shape in which the ridges between both side surfaces 6a and 6b form an acute angle. Further, the base end portion 7 has taper surface portions 7a and 7b that are continuous from each other on both side surfaces 6a and 6b of the cutting edge portion 6 in a divergent shape with a slight angle change.
It is formed in a tapered horseshoe shape in which the end portions of 7a, 7b are continuous via an arcuate curved surface portion 7c, and reaches from one tapered surface portion 7a through the arcuate curved surface portion 7c to the other tapered surface portion 7b. A V-shaped engaging groove 8 is formed in the central portion in the width direction of the outer peripheral surface portion of the horseshoe-shaped base end portion 7 as an engaging portion to be engaged with the joint portion with the blade tip 5 in the outer peripheral portion of the pedestal 1. Has been done.

Further, as shown in FIG. 6, the thickness t ₁ of the blade tip 5 is slightly thicker than the thickness t ₂ of the rotary pedestal 1, and specifically, both sides of the blade tip 5 are It is designed to protrude from both sides of the pedestal 1 by about 0.5 to 1.0 mm. By doing so, when the tip saw is rotated at a high speed to perform cutting processing, both side surfaces 6a and 6b of the pedestal 1 become objects to be cut. Good cutting can be performed without contact.

The plurality of blade chips 5 configured as described above are used to form the rotary pedestal 1 when the rotary pedestal 1 is molded.
It is arranged at a position corresponding to the joint between the pedestal 1 and the blade tip 5 in the injection molding die. When the molten or semi-molten engineering plastic is poured into the mold, the resin in the fluidized state flows into the engagement groove 8 of the blade tip 5, and the groove 8 and the outer peripheral surface of the tip 5 on both sides thereof. Join in close contact with the part. After that, by curing the resin, the one side surface 6a of the blade tip portion 6 of the blade tip 5 is flush with the one facing end surface 4a of the U-shaped notched recessed portion 4 of the rotary base 1. While exposed to the entrance 4,
The other side surface 6b projects in an inclined manner from the outer peripheral surface of the rotary pedestal 1, and the base end portion 7 of the blade tip 5 has a tapered outer peripheral surface. In the state in which the blade tip 6 is held in the state of being prevented from coming off in the projecting direction, the hardened resin portion is locked in the engaging groove 8 after further flowing into the engaging groove 8. , Both sides in the thickness direction are prevented from being pulled out. By thus preventing the withdrawal in both directions, each blade tip 5 is integrally fixed to the rotary base 1 in a non-removable state.

As described above, according to this embodiment, the protruding direction of the cutting edge portion 6 when the base end portion 7 of the blade tip 5 arranged in the mold is held by the injection resin forming the pedestal 1 To the rotary pedestal 1 and to prevent the blade tip 5 from coming off in the thickness direction by the engagement of the engaging groove 8 of the base end portion 7 with the injected resin.
In the molding of, the fixing form is not performed through an adhesive or the like, but is a structural form in which the resin bites into the outer peripheral shape of the blade tip 5, A state in which the pedestal 1 can receive a strong cutting reaction force applied to the cutting edge portion 6 of the blade tip 5 during the cutting process performed by rotating the tip saw at a high speed, which can be completely removed. Is.

The tip saw shown in FIG. 9 is mainly used as a cutting blade for woodworking, and the blade tip portion 6 of the blade tip 5 has a U-shaped notched recessed end face 4a and a rotary base 1. The outer peripheral surface is projected on both sides. Since other configurations are common to the above-described embodiment, the description thereof will be omitted to avoid duplication.

The engaging portion formed on the base end portion 7 of the blade tip 5 is formed by a plurality of protrusions 8a as shown in FIG. 10 in addition to the V-shaped groove as in the above embodiment. As shown in FIG. 11, the base end portion 7 of the blade tip 5 formed in a rectangular shape is provided with a hook-shaped penetrating engagement hole 8b opening to the rear surface and the lower surface of the base end portion 7, Various modifications are conceivable, such as the engagement of the engagement hole 8b with the resin forming the pedestal 1 to prevent the blade tip 5 from being pulled out in both the protruding direction and the thickness direction.

[0024]

As described above, in the tip saw of the present invention, the plate-shaped rotary pedestal is made of engineering plastic having heat resistance, and a plurality of high hardness materials are provided on the outer peripheral portion of the rotary pedestal. On the outer peripheral surface of the blade tip of, the engaging portion to be locked at the joint portion with the blade tip in the outer peripheral portion of the rotary pedestal, the rotary pedestal in a molten or semi-molten state at the time of molding the rotary pedestal By closely adhering the joint portion with each blade tip to each engaging portion of the plurality of blade tips, these blade tips are integrally fixed to the rotation base in a non-separable state. did. By forming the rotary pedestal to which the blade tip is fixed with the engineering plastic in this way, the pedestal can be made lightweight, and the pedestal can be efficiently mass-produced by using a resin processing method such as an injection molding method. is there.

Further, at the time of forming the pedestal, the outer peripheral joint surface of each blade tip can be adhered and fixed to the joint portion of the blade tip in the outer peripheral portion of the pedestal. That is, since the engineering plastic is in a molten or semi-molten state at the time of molding, the joint portion of the pedestal with each blade tip adheres to each engaging portion of the plurality of blade tips at the time of resin injection. As a result, each blade tip can be integrally fixed to the rotation base in a non-separable state.

Further, in this fixed state, since the engaging portion formed on the joint surface of the blade tip is permanently connected to the outer peripheral joint surface of the rotary pedestal in a non-separable state, the tip saw rotates at high speed. While driving, each blade tip is used to cut the object to be cut, and the strong reaction force applied to the blade tip is reliably received by the rotary pedestal, and the blade tip disengages and scatters. That dangerous situation does not occur at all. In addition, due to the high strength and high heat resistance of engineering plastics, frictional heat generated between the blade tip and the object to be cut during the cutting process causes the joint surface part of the pedestal to be softly deformed or destroyed. There is no danger at all.

Furthermore, during high speed cutting of the tip saw, metallic noise due to vibration and resonance due to the same kind of metal, which has been conventionally observed, is caused by the dissimilar material between the blade tip made of a high hardness material and the rotary pedestal made of engineering plastic. In this case, the noise and the resonance due to the propagation of the wind noise to the pedestal are avoided, so that the noise generation during use can be suppressed as much as possible, and a quiet working environment can be realized.

As described above, the tip saw of the present invention not only eliminates the noise during high-speed cutting to realize a quiet working environment, but also simplifies the manufacturing process, is suitable for mass production, and can be manufactured at low cost. In addition, a tip saw that can be remarkably lightened by using a resin, but has excellent strength and durability comparable to the conventional one using a metal plate rotating pedestal. It has the excellent effect of being able to achieve it.

[Brief description of drawings]

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

[Figure 2] Side view

3 is a cross-sectional view enlarged in the thickness direction along a cutting line AA in FIG.

FIG. 4 is an enlarged sectional view taken along the section line BB in FIG.

FIG. 5 is an enlarged front view showing a mounting portion of a blade tip.

6 is a cross-sectional view taken along the section line C-C in FIG.

FIG. 7 is an enlarged perspective view of a blade tip.

FIG. 8 is an enlarged perspective view of the blade tip seen from another direction.

FIG. 9 is an enlarged front view of a blade tip portion showing an application example to a tip saw used for woodworking.

FIG. 10 is an enlarged perspective view showing a modified example of the engaging portion of the blade tip.

FIG. 11 is a partially cutaway enlarged front view showing another modified example of the engaging portion of the blade tip.

[Explanation of symbols]

 1 rotary base 5 blade tip 8 engaging part 8a engaging part 8b engaging part

Claims (1)

Claim: What is claimed is: 1. A plate-shaped rotary pedestal is formed of engineering plastic having heat resistance, and a plurality of blade chips made of a high hardness material are provided on the outer periphery of the rotary pedestal. The outer peripheral surface of the, the engaging portion to be engaged with the blade tip portion of the outer periphery of the rotary base,
When the rotary pedestal is melted or semi-molten during molding of the rotary pedestal, a joining portion of the rotary pedestal with each blade tip is brought into close contact with each engaging portion of the plurality of blade tips, thereby making these blade tips A tip saw, characterized in that it is integrally fixed to a rotating base in a non-separable state.