JP4867341B2 - 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, such as being expensive.

  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 payment for a rotary blade, the cutting edge, with a thick plate thickness than the thickness of the base metal which has a polished treated rake face and the flank and clam face, corresponding to the shape of the chip made of hard metal chips It has a shape and is integrally formed with the base metal itself, and the cutting edge is hardened by induction heating so that its hardness is set to the same hardness as the tip, and the connecting portion of the cutting edge and the base metal that tempering of soft predetermined width is formed than the hardness of the blade destination edge base of the And butterflies.

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 a thickness larger than that of gold and having a chip shape corresponding to the shape of a chip made of super hard metal on the base metal itself, and quenching the cutting edge by induction heating and its hardness 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 which is a connecting portion between the cutting edge and the base metal. Forming a tempering section soft predetermined width than the degree, that it comprises the features.

According to a third aspect of the present invention, the step of integrally forming the blade edge on the base metal itself includes a first step of forming a blade edge portion on the outer peripheral edge of the base metal, and a blade edge formed in the first step. And a second step of forming a chip-shaped cutting edge having a plate thickness thicker than that of the base metal by at least one of cold, hot, and warm molding .

  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 a plate thickness thicker than the base metal, and the hardness treatment is performed. Therefore, the cutting edge can be used as a conventional tip, no brazing material is required for fixing the tip, and resources such as silver can be saved. Therefore, it is possible to reduce the manufacturing cost of the rotary blade and obtain an inexpensive rotary blade for brush cutting.

In addition, the rake face, the flank face, and the settling face of the blade edge are hardened, and the base of the blade edge that serves as a connecting portion between the blade edge and the base metal is tempered with a predetermined width . While maintaining the hardness, the base can have a predetermined elasticity to prevent breakage between the cutting edge and the base metal, and a rotary blade for brush cutting that can be used stably for a long period of time can be obtained.

Further, according to the invention described in claim 2 , a step of forming a disk-shaped base metal, a step of forming a cutting edge having a plate thickness thicker than the base metal and exhibiting a chip shape, and a hardness treatment on the cutting edge Since the cutting edge can be used as a conventional tip, a brazing material for fixing the tip is not required, resources such as silver can be saved, and a flux is not required, so that the working environment can be used. Therefore, it is possible to reduce the manufacturing cost of the rotary blade and obtain an inexpensive rotary blade for brush cutting.

According to the invention described in claim 3 , in addition to the effect of the invention described in claim 2 , the step of forming the blade edge includes a first step of forming the blade edge portion on the outer peripheral portion of the base metal, and the blade edge portion. The second step of forming a chip-shaped cutting edge having a plate thickness thicker than the base metal by cold, hot, warm molding, etc., so that the blade edge thicker than the base metal can be easily formed by various methods, The manufacturing cost of the rotary blade for mowing can be further reduced.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
1 to 5 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 main part, FIG. 3 is a side view thereof, and FIG. Process drawing which shows an example of a manufacturing method, FIG. 5 is the explanatory drawing.

  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. As shown in FIGS. 2 and 3A, the cutting edge 4 has a rake face 4a, a flank face 4b, and both side faces 4c inclined so as to reduce the thickness on the rear side in the rotational direction. It is formed in a shape (chip shape) corresponding to the shape of the chip made of super hard metal.

  The plate thickness t1 (see FIG. 3) of the blade edge 4 is formed to be larger by a predetermined dimension (thicker) than the plate thickness t2 of the base metal 2, and both side surfaces 4d of the blade edge 4 are predetermined outward from the front and back surfaces of the base metal 2. In addition to projecting the dimensions, the surfaces 4a to 4c of the blade edge 4 are set to have a hardness HRC of about HRC 60 to 63, which can obtain a cutting performance similar to that of a conventional chip, by quenching.

  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, both side surfaces 4c of the blade edge 4 are provided so as to protrude to the sides of the base metal 2 and the front and back surfaces, respectively. However, as shown in FIG. 3B, for example, It is also possible to provide the side surfaces alternately protruding.

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). When the blade portion is formed on the base metal 2, the base metal 2 is fully quenched by, for example, high frequency induction heating to set the entire base metal 2 to a predetermined hardness and form a blade edge portion (K12).

As shown in FIG. 5A, the formation of the blade edge portion at this time is a state in which the blade edge portion 8 of the base metal 2 is set on the female die 9a simultaneously with the entire quenching, and the blade edge portion 8 is heated by quenching. Then, the male die 9b is pushed into the female die 9a as shown by an arrow (i.e., hot- molded ), and the blade edge portion 8 is projected to the side of the base metal 2 as shown in FIG. 5B. . The formation of the cutting edge 4 is not limited to hot working, other forming methods such as cold molding or warm molding can also be employed, in the case of these, the entire quenching and simultaneous base metal 2 It should be done before and after the entire quenching.

When the cutting edge 4 portion is formed in step K12, the cutting edge 4 portion is polished (K13) to form the cutting edge 4 having the rake face 4a, the flank face 4b, the side face 4c, and the like. Quenching (K14) is set to the hardness described above. The polishing in step K13 is performed by, for example, wet polishing, and the rake face 4a, the flank face 4b, the side face 4c, and the like of the blade edge 4 are polished. Then, when the cutting edge 4 is quenched and set to a predetermined hardness in step K14, 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, the cutting edge is performed. Various finishings (K16) such as attaching safety tube to 4 are performed. Thereby, the rotary blade 1 is manufactured.

In addition, the above process is an example, Comprising: For example, the process shown in FIG.4 (b) is also employable. That is, in the manufacturing method of FIG. 4B, after the entire quenching and formation of the cutting edge part (K12), the cutting edge part 8 is quenched (K14), the local part is tempered (K15), and then the cutting edge part 8 is polished. (K13) and the cutting edge 4 is formed .

  Thus, according to the rotary blade 1 of the above embodiment, the cutting edges 4 formed at regular intervals on the outer peripheral edge portion 2a of the base metal 2 have a thickness t1 that is thicker than the thickness t2 of the base metal 2 and are inserted. Since it is formed into a shape and is 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, so that a brazing material for fixing the tip becomes unnecessary, and as a resource only It is possible to save resources such as silver, and the flux used at the time of fixation is unnecessary, which can prevent deterioration of the work environment and the global environment due to vaporization and scattering of the flux, and damage to the human respiratory system Can be prevented, and the cost of these measures can be greatly 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 4a, the flank face 4b, both side faces 4c and the like of the blade edge 4 are subjected to quenching treatment, and the base portion which becomes the connecting portion with the base metal 2 of the blade edge 4 is tempered to have 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, if a rough surface having a predetermined shape inclined at a predetermined angle with respect to the rotation direction of the base metal 2 is formed on a part of the rake face 4a, the sharpness of the rotary blade 1 can be improved, It becomes possible to easily obtain the rotary blade 1 having excellent cutting performance similar to that of a tip saw.

  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 and position of 6, the form of the molds 9 a and 9 b, and the like 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   Explanation of the same

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・ ・ ・ Side 5 ・ ・ ・ Blade chamber 6 ・ ・ ・ Tempered part 7 ・ ・ ・ Round hole 8 ・ ・ ・ Blade part 9 a ・ ・ ・ Female mold 9 b ・ ・ ・ Male mold t1 ・ ・ ・ Blade plate Thickness t2 Base metal plate thickness

Claims (3)

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 chip shape corresponding to the shape of the chip made of super hard metal, and has a chip shape corresponding to the shape of the chip made of super hard metal, having a polished rake face, a flank surface, and a rough surface and having a thickness greater than that of the base metal 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 is formed at the base of the cutting edge that is a connecting portion between the cutting edge and the base metal. A rotary blade for brush cutting, characterized in that a tempering portion having a predetermined width that is 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 ,
From the step of forming the disk-shaped base metal, the step of forming the blade chamber at a predetermined interval on the outer peripheral edge of the base metal, and the thickness of the base metal with a rake face, a relief surface, and a settling surface A step of integrally forming a cutting edge with a thick plate thickness corresponding to the shape of a chip made of super hard metal on the base metal itself, and quenching the cutting edge by induction heating, the hardness of which is the same as that of the above chip And a step of forming a tempered portion having a predetermined width that is softer than the hardness of the blade edge at a base portion of the blade edge that is a connecting portion between the blade edge and the base metal. Of manufacturing a rotary blade. The step of forming the cutting edge integrally with the base metal itself includes a first step of forming the cutting edge portion on the outer peripheral edge of the base metal, and a cold, hot, and warm forming of the cutting edge portion formed in the first step. A method for producing a rotary blade for brush cutting according to claim 2, further comprising a second step of forming a chip-shaped cutting edge having a plate thickness thicker than the base metal by at least one of the above .

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