JP4867342B2 - Rotating blade for mowing and manufacturing method thereof - Google Patents

Description

  The present invention relates to a rotary blade for mowing used when trimming plants such as weeds, weeds, and small bamboos, and a method for manufacturing the same.

Conventionally, as a rotary blade for brush cutting, for example, a tip saw shown in Patent Document 1 is known. In this tip saw, a large number of chip mounting recesses are formed at predetermined intervals on the outer peripheral edge of the base metal, and a large number of blade chambers (valleys) recessed in the center direction of the base metal are formed between the chip mounting recesses. A chip made of super hard metal is brazed and fixed in each chip mounting recess using high frequency induction heating and brazing material.
Japanese Patent No. 2849985

  However, in such a chip saw, it is necessary to fix the base metal and a chip made of a different metal to the chip mounting recess formed in the base metal. Therefore, for example, a solder containing about 46% silver for fixing the chip. This is not desirable in terms of saving limited silver resources. In addition, a flux is also required to fix the chip, and this flux is likely to be vaporized and scattered by high frequency induction heating, which may worsen the work environment, etc. There is a problem that it is easy to increase the manufacturing cost of the tip saw, for example, it is expensive to take measures.

  The present invention has been made in view of such circumstances. The purpose of the present invention is to reduce the manufacturing cost and save resources by integrally forming a chip-shaped cutting edge on the base metal itself. It is providing the rotary blade for manufacturing and its manufacturing method.

In order to achieve this object, the invention according to claim 1 of the present invention (the rotary blade for brush cutting) includes a disk-shaped base metal having a mounting hole for a brush cutter at a central position, A cutting edge provided with a cutting edge formed at a predetermined interval on the outer peripheral edge of the base metal, and a blade chamber recessed in a curved shape toward the central position of the base metal between the cutting edges at the outer peripheral edge part of the base metal A tip for rotating the blade , wherein the cutting edge has a polished rake face, a flank face and a rough face, and has the same thickness as the base metal plate, and corresponds to the shape of a tip made of a hard metal. The cutting edge is hardened by induction heating and its hardness is set to the same hardness as the tip, and the connecting portion of the cutting edge and the base metal characterized in that the tempering of the base to the blade destination soft predetermined width than the hardness of the cutting edge is formed consisting To.

The invention according to claim 2 (a method for manufacturing a rotary blade for brush cutting) includes a disk-shaped base metal having a mounting hole for a brush cutter at a central position, and an outer peripheral edge portion of the base metal. Manufacturing a rotary blade for brush cutting comprising: a cutting edge formed at a predetermined interval; and a blade chamber recessed in a curved shape toward the center position of the base metal between the cutting edges at the outer peripheral edge of the base metal a method, platform and having a step of forming the disc-shaped base metal and forming the blade chamber at predetermined intervals in the outer periphery of the該台gold, a rake face and a flank and clams surface A step of integrally forming a cutting edge having the same thickness as that of the gold plate and having a chip shape corresponding to the shape of the chip made of super hard metal on the base metal itself, and quenching the cutting edge by induction heating to increase its hardness. The step of setting the same hardness as the tip, and the hardness of the cutting edge at the base of the cutting edge that becomes the connecting part of the cutting edge and the base metal Forming a tempering section soft predetermined width Ri, characterized in that it comprises a.

  According to the first aspect of the present invention, the cutting edges formed at predetermined intervals on the outer peripheral edge of the base metal are formed in a chip shape having the same thickness as the plate thickness of the base metal itself. In addition, since it is hardened, the cutting edge can be used as a conventional tip, eliminating the need for brazing material for tip fixation, saving resources such as silver, and eliminating the need for flux. It is possible to reduce the manufacturing cost of the rotary blade and to obtain an inexpensive rotary blade for brush cutting, such as preventing deterioration of the environment and the like and eliminating human respiratory system disorders.

In addition, the rake face, flank face, and rough face of the cutting edge are hardened, and the base of the cutting edge, which is the connecting part between the cutting edge and the base metal, is tempered, so that the part that functions as the blade is maintained at a predetermined hardness. However, it is possible to obtain a rotary blade for brush cutting that can be used stably over a long period of time by preventing the breakage between the blade tip and the base metal by giving the base portion predetermined elasticity. In addition, since the cutting edge has a rough surface and is ground together with the rake surface and flank surface, the sharpening surface improves the sharpness of the rotary blade, and the rotation for brush cutting has the same cutting performance as the tip saw. A blade can be obtained.

According to the invention described in claim 2, the step of forming the disc-shaped base metal, the step of forming the cutting edge having the same thickness as the base metal plate thickness, and the shape of the chip, and the cutting of the cutting edge are performed. Since the cutting edge can be used in the same way as conventional chips, no brazing material for chip fixing is required, resources such as silver can be saved, and flux is not required. Thus, it is possible to reduce the manufacturing cost of the rotary blade, such as preventing deterioration of the working environment, etc., and to obtain an inexpensive rotary blade for brush cutting.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
1 to 4 show an embodiment of a rotary blade for mowing according to the present invention, FIG. 1 is a plan view thereof, FIG. 2 is an enlarged view of its essential part, FIG. 3 is a side view thereof, and FIG. It is process drawing which shows an example of a manufacturing method.

  In FIG. 1, a rotary blade 1 for brush cutting (hereinafter referred to as a rotary blade 1) has a disk-shaped base metal 2, and the central position of the base metal 2 is used for attachment to a brush cutter (not shown). A mounting hole 3 having a predetermined inner diameter is formed, and a large number of cutting edges 4 are formed in the outer peripheral edge 2a of the base metal 2 at regular intervals, for example, in the circumferential direction. 2 and 3A, the cutting edge 4 has a rake face 4a, a flank face 4b, a rough face 4c having an angle α, a side face 4d, and the like, and is a conventional tip made of a hard metal. It is formed in a shape (chip shape) corresponding to the shape.

  The plate thickness t1 (see FIG. 3) of the blade edge 4 is set to be the same as the plate thickness t2 of the base metal 2, and the surfaces 4a to 4c of the blade edge 4 are quenched, and the hardness HRC thereof is the conventional chip. It is set so that it may become about HRC60-63 which can obtain the cutting performance substantially the same. In addition, as shown in FIGS. 1 and 2, blade chambers 5 that are recessed in a curved shape toward the center position direction (mounting hole 3 direction) of the base metal 2 are formed between the adjacent blade edges 4, respectively. A tempering portion 6 (see FIG. 2) having a predetermined width that is softer than the hardness of the blade edge 4 is formed at a connecting portion between the blade chamber 5 (base metal 2) and the blade edge 4. Furthermore, a plurality of circular holes 7 (see FIG. 1) having an appropriate inner diameter are formed in a predetermined annular portion of the base metal 2 as necessary for the purpose of preventing warpage, noise prevention, weight reduction, and the like. .

  In FIG. 3A, the cutting edge 4 is formed in a flat plate shape that is flush with the base metal 2, and for example, a part of the rake face 4a of the cutting edge 4 is ground (polished) by an angle α. Although the surface 4c is provided, for example, as shown in FIG. 3B, the blade edge 4 is formed by alternately inclining the blade edge 4 in the thickness direction of the base metal 2 when forming the blade edge 4 described later. A set surface 4c can be provided by projecting to the side of the base metal 2, and the set surface 4c can be inclined by a predetermined angle β as shown by a two-dot chain line in FIG.

Next, an example of a method for manufacturing the rotary blade 1 will be described with reference to FIG. As shown in FIG. 4A, first, a disk-shaped base metal 2 is formed (K10) by stamping a steel plate press or the like, and the outer peripheral edge 2a of the base metal 2 is punched, for example, by press. Thus, a blade portion composed of the blade chamber 5 and the blade edge 4 is formed at regular intervals (K11). After forming the blade portion on the base metal 2, the base metal 2 is fully quenched by high frequency induction heating (K12) to set the entire base metal 2 to a predetermined hardness, and then the cutting edge 4 is polished (K13). Furthermore, this cutting edge 4 is set to the above-mentioned hardness by induction hardening (K14), for example. The polishing in the process K13 is performed by, for example, wet polishing, and the rake face 4a, the flank face 4b, the rough face 4c, the side face 4d, and the like of the blade edge 4 are polished.

Then, when the cutting edge 4 is quenched and set to a predetermined hardness, the base part of the cutting edge 4 which is a local part is tempered (K15) to form the tempered portion 6 described above, and then the application of rust preventive oil is applied to the cutting edge 4 Various finishes (K16) such as safety tube mounting are performed. Thereby, the rotary blade 1 is manufactured. In addition, when the above-mentioned surface 4c is formed on the cutting edge 4, as shown by a two-dot chain line in FIG. 4A, it may be formed after the step K12.

Moreover, the above process is an example, For example, the manufacturing method shown in FIG.4 (b) is also employable. That is, in this manufacturing method, after the entire quenching (K12), the cutting edge 4 is quenched (K14), the local part is tempered (K15), and then the cutting edge 4 is polished (K13). In the case of this process, the set surface 4c may be formed after the local tempering (K15). In addition, the order of each process at the time of manufacture of the rotary blade 1 is not limited to Fig.4 (a) (b), According to an installation etc., an appropriate process can be employ | adopted.

  Thus, according to the rotary blade 1 of the above-described embodiment, the cutting edge 4 formed on the outer peripheral edge 2a of the base metal 2 at a constant interval has the same thickness as the plate thickness t2 of the base metal 2 and has a chip shape. Since it is formed and subjected to hardness treatment by induction hardening, the cutting edge 4 formed integrally with the base metal 2 can be used as a conventional tip, and a brazing material for fixing the tip becomes unnecessary, and the resource is limited. In addition to saving resources such as silver, the flux used at the time of fixation is unnecessary, and it is possible to prevent deterioration of the work environment and the global environment due to vaporization and scattering of the flux, greatly increasing the cost of these measures Can be reduced.

In addition, since the cutting edge 4 is formed on the base metal 2 itself, the conventional tip fixing work is not required. For example, the cutting edge 4 can be easily formed by an automatic machine and is conventionally required for brazing. This eliminates the need for the high-frequency induction heating device (inverter), reduces equipment costs, and eliminates the costs of chip and flux materials and their management costs. Furthermore, the cutting edge 4 can be formed on the base metal 2 itself, and the entire quenching and cutting edge quenching can be performed with the quenching apparatus used in the conventional tip saw, which can cope with the introduction of new equipment as much as possible. Therefore, it is possible to reduce the manufacturing cost of the rotary blade 1 and obtain an inexpensive rotary blade 1.

  Further, the rake face 4 a, the flank face 4 b, and the settling face 4 c of the blade edge 4 are subjected to a quenching process, and the base part that becomes the connecting part with the base metal 2 of the blade edge 4 is tempered to a tempering part 6 having a lower hardness than the blade edge 4. Therefore, it is possible to prevent a breakage between the blade tip 4 and the base metal 2 by maintaining a predetermined elasticity in the base while maintaining a portion functioning as a blade at a predetermined hardness. 1 can be used stably over a long period of time. Further, since the cutting edge 4 has a rough surface 4c and is polished together with the rake surface 4a and the flank surface 4b, the sharpness of the rotary blade 1 is improved by the rough surface 4c and the like, and cutting performance comparable to that of a tip saw is achieved. Can be easily obtained.

  In the above embodiment, the number of cutting edges 4, the shape of the circular holes 7, the shape of the base 2 itself such as the number, the shape of the cutting edge 4 itself, the shape of the blade part including the cutting edge 4 and the blade chamber 5, and the tempering part The shape, position, and the like of 6 are examples, and can be appropriately changed without departing from the gist of each invention according to the present invention.

  The present invention can be applied to rotary blades corresponding to all cutting saws for which cutting tips have conventionally been used as cutting edges.

  The top view which shows an example of the rotary blade for brush cutting concerning this invention   Enlarged view of the main part   The side view   Process diagram showing an example of the manufacturing method

DESCRIPTION OF SYMBOLS 1 .... Rotary blade for brush cutting 2 .... Base metal 2a ... Outer peripheral edge 3 .... Mounting hole 4 .... Cutting edge 4a ... Rake face 4b ... Relief face 4c ... Crest surface 4d ... Side surface 5 ... Blade chamber 6 ... Tempered part 7 ... Circular hole t1 ... Blade thickness t2 ... Base metal plate thickness

Claims (2)

A disc-shaped base metal in which a mounting hole for a brush cutter is drilled at a central position, a cutting edge formed at a predetermined interval on the outer peripheral edge of the base metal, and the cutting edge between the peripheral edges of the base metal A rotary blade for brush cutting provided with a blade chamber recessed in a curved shape toward the center position of the base metal ,
The cutting edge has a polished rake face, a flank face, and a rough face, and has the same thickness as the base metal plate, and has a chip shape corresponding to the shape of the chip made of super hard metal, and the base metal itself. In addition to being integrally formed, the cutting edge is hardened by induction heating, and the hardness thereof is set to the same hardness as that of the tip, and the cutting edge of the cutting edge is connected to the base of the cutting edge that is a connecting portion of the cutting edge and the base metal A rotary blade for brush cutting, wherein a tempering portion having a predetermined width softer than the hardness is formed . A disc-shaped base metal in which a mounting hole for a brush cutter is drilled at a central position, a cutting edge formed at a predetermined interval on the outer peripheral edge of the base metal, and the cutting edge between the peripheral edges of the base metal A blade blade that is recessed in a curved shape toward the center position of the base metal, and a method of manufacturing a rotary blade for brush cutting ,
A step of forming the disc-shaped base metal and forming the blade chamber at predetermined intervals in the outer periphery of the該台gold, and the plate thickness of the base metal which has a rake face and a flank and clams surface A step of integrally forming a cutting edge having the same thickness and having a chip shape corresponding to the shape of a chip made of cemented carbide on the base metal itself, and quenching the cutting edge by induction heating, the hardness of which is the same as that of the chip A step of setting the hardness, and a step of forming a tempered portion having a predetermined width that is softer than the hardness of the cutting edge at the base of the cutting edge, which is a connecting portion between the cutting edge and the base metal, A manufacturing method of a rotary blade.

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