JP6566362B2 - Chip saw for mowing - Google Patents

Description

  The present invention relates to a chip saw for mowing that is attached to a mower and used when mowing weeds and weeds (referred to as weeds).

  Conventionally, a tip saw for brush cutting has a mounting hole for a brush cutter formed in the center of a disk-shaped base metal, and a plurality of blade chambers and chip fixing portions are provided at regular intervals on the outer edge of the base metal. A chip made of cemented carbide or the like is brazed to each chip fixing portion. As this type of tip saw, for example, Patent Document 1 is known.

JP 2007-44023 A

  However, in such a chip saw, the base metal itself is formed in a flat plate shape, and the chips are only fixed to the chip fixing portions on the outer peripheral edge thereof, so that the strength of the base metal itself is increased. In this case, it is necessary to increase the thickness of the base metal. In this case, the weight of the tip saw becomes heavy and the burden on the mowing worker tends to increase.

  Therefore, a large number of lightweight holes are provided in the base metal to suppress the increase in the weight of the base metal as much as possible. However, even with such a structure, it is difficult to simultaneously increase the strength and weight of the base metal. In addition, since the base metal itself is a flat plate, weeds, etc. cut by the tip wrap around the mounting flange part of the brush cutter from the surface that becomes the mounting surface of the base metal to the brush cutter, thereby inhibiting the rotation of the tip saw. The cutting efficiency may be inferior.

  The present invention has been made in view of such circumstances, and its purpose is to suppress winding around the mounting flange portion of a mower such as weeds, while increasing the strength and weight of the base metal itself. Then, it is providing the chip saw for mowing which can improve the work efficiency of mowing work.

In order to achieve this object, the invention according to claim 1 of the present invention is such that a plurality of chip fixing portions are formed on the outer peripheral edge of the disk-shaped base metal, and chips are respectively placed on the chip fixing portions. in attaching been mowing for tipped, said base metal, mounting holes to brush cutter is formed in its central portion, mowing the surface of the mounting surface to the mowing machine of the outer peripheral side of the mounting hole A substantially hemispherical convex portion protruding in the direction of the brush cutter is integrally formed at a position on the outer peripheral side of the mounting flange of the machine by pressing drawing , and the convex portion is centered on the mounting hole of the base metal. By forming a plurality of pieces on the circumferential line, an annular wall portion having a curved upper surface can be formed when the base metal is rotated at a predetermined number of revolutions .

Further, in the invention according to claim 2, a plurality of the convex portions are respectively formed on a plurality of circumferential lines centering on the attachment holes of the base metal, and an outer side is provided between the convex portions on the inner circumferential line. A protrusion on the circumferential line is located . According to a third aspect of the present invention, the annular wall is formed by a convex portion that rotates when the base metal rotates at a predetermined number of revolutions by identifying the convex portion by shape or color. The unit can display a state corresponding to the number of rotations . Furthermore, the invention described in claim 4 is characterized in that a lightweight hole having a smaller diameter than the outer shape of the convex portion is formed between the plurality of convex portions.

According to the invention described in claims 1 to 3 of the present invention, the surface of the attachment hole of the base metal that is the attachment surface to the brush cutter is located on the outer peripheral side of the attachment flange of the brush cutter. Since a plurality of protrusions projecting in the direction of the brush cutter are integrally formed, the strength of the base metal itself can be increased by the convex parts, and the thickness of the base metal can be reduced and reduced in weight. It is possible to suppress the winding of the weeds and the like that have been cut off by the convex portions to be attached to the mounting flange portion, and to improve the work efficiency of the mowing work.

In particular, the plurality of convex portions formed on the surface of the base metal rotate because the convex portions are substantially hemispherical and formed on one or a plurality of circumferential lines centering on the mounting holes of the base metal. Thereby, winding around the attachment flange parts, such as weeds, can be suppressed reliably.

At the same time, since the plurality of convex portions can form an annular wall when the base metal rotates at a predetermined number of revolutions, the weeds and the like that have been cut off are placed on the surface of the base metal in the direction of the mounting flange. Even if it moves, it will be in the state of being rebounded by the wall part formed of a convex part, and it can suppress more reliably the winding to attachment flange parts, such as weeds.

Further, according to the invention described in claim 4, in addition to the effect of the invention according to claims 1 to 3, since the small-diameter lightweight hole than the outer shape of the convex portion between the plurality of convex portions are formed, The work efficiency of the brushing work can be further improved by promoting the weight reduction while suppressing the strength reduction of the base metal.

  The top view which shows one Embodiment of the chip saw for brush cutting concerning this invention   Sectional view along the AA line   Enlarged view of the main part of Fig. 2   The figure which shows the attachment state to the same brush cutter   Explanatory drawing showing the operation   Plan view showing the modification

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
1 to 5 show an embodiment of a cutting saw tip saw according to the present invention. As shown in FIG. 1 and FIG. 2, a cutting saw tip saw 1 (referred to as a tip saw 1) has a disk-shaped base metal 2 having a front surface 2a and a rear surface 2b and having a predetermined plate thickness. A mounting hole 3 for a brush cutter 10 to be described later is formed at the center position.

  The base metal 2 is provided with a plurality of blade chambers 4 recessed at the outer peripheral edge in the direction of the mounting hole 3 at regular intervals. The chip adhering portions 5 are respectively formed. Each chip fixing portion 5 is brazed with a chip 6 made of a cemented carbide.

  In addition, a plurality of the surfaces 2a as mounting surfaces to be attached to the brush cutter 10 of the base metal 2 are protruded above the surface 2a on a circumferential line centering on the mounting holes 3 (8 in the figure). Ridges 7 are formed at regular intervals. The convex portion 7 is formed integrally with the base metal 2 in a substantially hemispherical shape by a drawing process of a press or the like on a surface 2a located on the outer peripheral side of a saw receiving flange 10b as a mounting flange of the brush cutter 10 described later. ing.

  At this time, the height of the convex portion 7 is set to a size that does not contact the tip portion of the rotation transmission shaft 10a of the brush cutter 10 when attached to the brush cutter 10 shown in FIG. The inner diameter of the circumferential line connecting the inner peripheral edges of 7 is set to be larger by a predetermined dimension than the outer diameter of the saw receiving flange 10b having the largest outer shape of the general brush cutter 10. As a result, when the tip saw 1 having the convex portion 7 formed on the surface 2a is attached to a commercially available brush cutter 10 and rotated at a predetermined rotational speed, the rotational operation is not hindered. ing.

  In addition, as shown in FIG. 3, as for the said convex part 7, while the connection part with the surface 2a and the back surface 2b of the base metal 2 is set to predetermined | prescribed round shape, as shown in FIG. Lightweight holes 8 having a smaller diameter than the outer shape of the convex portion 7 are formed between them, so that the base metal 2 itself is reduced in weight. Further, since the base metal 2 itself is increased in strength (rigidity) by the convex portion 7 provided on the base metal 2, the thickness of the base metal 2 itself is made thinner than before, and the weight of the base metal 2 is reduced. It is also possible to make it easier.

  The chip saw 1 configured as described above is manufactured, for example, as follows. That is, first, a base material (raw material such as carbon steel plate) is processed by drawing or the like of a press to have the mounting hole 3, the blade chamber 4, the tip fixing part 5, the lightweight hole 8, and the convex part 7. Gold 2 is formed. That is, the convex portion 7 is formed integrally with the base metal 2 and functions as a rib of the base metal 2 to increase the strength of the base metal 2 itself.

  Then, heat treatment is performed to quench and anneal the base metal 2 using, for example, high-frequency induction heating. When the heat treatment is performed in a state where the outer peripheral side of the convex portion 7 of the base metal 2 is heated and pressed, warpage of the base metal 2 itself is prevented. Next, when the heat treatment of the base metal 2 is finished, for example, a surface treatment by shot blasting is performed, or the chip 6 is brazed to each chip fixing portion 5 of the base metal 2 using, for example, high-frequency induction heating. After the brazing, the chip saw 1 is manufactured by polishing the scooping surface, the tip surface, and both side surfaces of the chip 6 and performing a finishing process.

  As shown in FIG. 4, the tip saw 1 configured in this way is connected to a saw receiving flange 10b at the tip of the rotation transmission shaft 10a of the brush cutter 10 via a saw retainer flange 10c, a mounting bolt 11, a bolt protection cover 12, and the like. Attached. At the time of attachment, the outer peripheral surface 2a and the rear surface 2b of the attachment hole 3 of the base metal 2 of the tip saw 1 abut against the flange surfaces of the flanges 10b and 10c, and the convex portion 7 is provided on the outer peripheral side of the saw receiving flange 10b. It will be in the position.

  When the engine of the brush cutter 10 is started in the attached state to the brush cutter 10, the tip saw 1 rotates through the rotation transmission shaft 10 a, and weeds and the like are brushed off by the tip 6. When the cutting saw 1 rotates at a predetermined rotational speed (for example, 7000 to 12000 times per minute) in the direction of the arrow a during this cutting, an annular wall having convex portions 7 continuous as shown by a two-dot chain line in FIG. The weeds and the like that have been cut by the tip 6 that functions as the portion (annular wall portion K) and functions as the cutting edge of the base metal 2 tip the surface 2a of the base metal 2 inward (in the direction of the saw receiving flange 10b). Moving.

  The weeds and the like that move on the surface 2a collide with the annular wall portion K formed by the rotating convex portion 7 and bounce back as shown by arrows b and c in FIG. The attachment and winding to the saw-receiving flange 10b portion of the brush cutter 10 positioned at the position S is suppressed. Thereby, the extreme fall of rotation speed of the tip saw 1 and the rotation stop by winding of weeds etc. during a mowing operation can be suppressed significantly compared with the past.

  That is, in the case of the tip saw 1, eight convex portions 7 are integrally formed on the outer periphery side of the saw receiving flange 10b of the brush cutter 10 on the surface 2a of the base metal 2, and each convex portion 7 is mounted on the base. By reducing the thickness of the base metal 2 by functioning as a rib of the gold 2 and reducing the thickness of the base metal 2, the weight of the chip saw 1 can be reduced, and the annular wall portion K formed by the rotating convex portion 7. Thus, it is possible to suppress winding around the saw receiving flange 10b portion of cut weeds or the like.

  Thus, according to the tip saw 1, the surface 2a which is the mounting surface to the brush cutter 10 on the outer peripheral side of the mounting hole 3 of the base metal 2 is the outer peripheral side of the saw receiving flange 10b of the brush cutter 10. Further, since the eight convex portions 7 projecting in the direction of the brush cutter 10 (above the surface 2a) are integrally formed, the strength of the base metal 2 itself can be increased by the convex portion 7, and the thickness of the base metal 2 can be increased. As a result, it is possible to reduce the weight and reduce the weight, and to suppress the winding around the saw receiving flange 10b portion of weeds and the like cut by the rotating convex portion 7, and to improve the work efficiency of the mowing work.

  Further, since the eight convex portions 7 are substantially hemispherical and are formed on the circumferential line around the attachment hole 3 of the base metal 2, the plurality of convex portions 7 formed on the surface 2 a of the base metal 2 rotate. By doing this, it is possible to reliably suppress winding of the weeds and the like around the saw receiving flange 10b. In particular, the arrangement, shape, and the like of the eight convex portions 7 are set so that the annular wall portion K can be formed when the base metal 2 is rotated at a predetermined number of rotations. However, even if it moves on the surface 2a of the base metal 2 in the direction of the saw receiving flange 10b, it is surely rebounded by the annular wall portion K formed by the convex portion 7, and the saw receiving flange 10b portion of weeds etc. Winding can be more reliably suppressed.

  Moreover, since the convex part 7 is formed in the substantially hemispherical shape, the upper surface of the annular wall part K formed by this convex part 7 becomes a curved surface, and the weeds etc. which collided with the annular wall part K rebound diagonally upward. Thus, the entanglement of the collided weeds themselves can be suppressed, and a more reliable wrapping suppression function can be obtained on the convex portion 7.

  Furthermore, since the plate thickness of the base metal 2 itself can be reduced by increasing the strength due to the integral formation of the convex portion 7, the weight of the base metal 2 can be reduced to reduce the physical burden on the operator during the mowing operation. Since the light-weight holes 8 smaller in diameter than the outer shape of the convex portions 7 are formed between the eight convex portions 7, the weight reduction can be further promoted while suppressing the strength reduction of the base metal 2. Thus, the work efficiency of the mowing work can be further improved. Further, since the convex portion 7 is integrally formed on the surface 2 a of the base metal 2, the convex portion 7 is not scattered away from the base metal 2 even if a centrifugal force due to rotation acts on the convex portion 7. It is also possible to increase the safety of payment work.

  By the way, in the case of the tip saw 1 of the above embodiment, the eight convex portions 7 are integrally formed on one circumferential line, and one annular wall portion K is formed when the tip saw 1 is rotated. A plurality of annular wall portions K may be formed. That is, as shown in FIG. 6, a plurality of (eight in the figure) hemispherical convex portions 7a are integrally formed on the circumferential line having the radius r1 from the center of the mounting hole 3, and the outer peripheral side of the convex portion 7a is A plurality of (eight in the drawing) hemispherical convex portions 7b are integrally formed on a circumferential line having a radius r2 (r1 <r2) from the center of the mounting hole 3 to be formed.

  At this time, the sizes (outer diameters) of the protrusions 7a and 7b are made different so that the inner protrusion 7a is larger and the outer protrusion 7b is smaller (or vice versa) It forms so that the outer convex part 7b may be located between the convex parts 7a. According to this configuration, the inner and outer annular wall portions K1 and K2 are formed by the rotating convex portions 7a and 7b, and the saw receiving flange 10b portion of weeds and the like that could not be suppressed by the outer convex portion 7b. The wrapping around can be reliably suppressed by the inner convex portion 7a.

  In addition, the inner and outer convex portions 7a and 7b arranged in an annular shape can simultaneously increase the strength of the base metal 2 itself, and further reduce the thickness of the base metal 2 by reducing the plate thickness. become. In the case of this example, the number of the inner and outer convex portions 7a and 7b may be made different, and it is of course possible to make the shapes themselves different.

  Further, in the tip saw 1, the convex portions 7, 7a, 7b (hereinafter referred to as convex portions 7 and the like) are identified by their shapes and colors so that the base metal 2 rotates when rotated at a predetermined rotational speed. As a configuration in which the annular wall portions K, K1, and K2 formed by the convex portions 7 and the like can display the state according to the rotation speed, the brush cutter can visually recognize the rotation speed of the base metal 2 during the brush cutting work. That is, the convex portion 7 and the like may be provided with a rotation number visual recognition function.

In the above-described embodiment, the case where the convex portion 7 or the like has a substantially hemispherical shape in a plan view has been described. However, the present invention is not limited thereto, and for example, the convex portion 7a or the like has a substantially elliptical shape in a plan view. It may be substantially hemispherical . As described above, the convex portions 7 and the like formed on the surface 2a of the base metal 2 can employ various shapes that function as ribs for increasing the strength of the base metal 2.

  Further, in the above embodiment, the shape of the base metal 2 itself, the number of convex portions 7 and the like, the number of chip fixing portions 5 and the like are examples, and for example, the flat portion to which the brush cutter 10 is attached to the base metal 2; A cutting edge in which the inclined portion is inclined at a predetermined angle toward the anti-brusher 10 direction on the outer peripheral side of the flat portion, and the convex portion 7 is formed integrally with the flat portion on the outer peripheral side of the inclined portion. Appropriate configurations are adopted without departing from the gist of the invention of the present invention, such as application to a base metal having a portion, or appropriately increasing or decreasing the number of convex portions 7 etc. according to the outer diameter of the base metal 2 can do.

  INDUSTRIAL APPLICABILITY The present invention can be used for all cutting saws for cutting, which are used for cutting away weeds and the like with chips fixed to the outer peripheral edge of a disk-shaped base metal.

  DESCRIPTION OF SYMBOLS 1 ... Cutting saw tip saw, 2 ... Base metal, 2a ... Front surface (mounting surface), 2b ... Back surface, 3 ... Mounting hole, 4 ... Blade chamber, 5 ... Tip fixing part, 6 ... chip, 7, 7a, 7b ... convex part, 8 ... lightweight hole, 10 ... brush cutter, 10a ... rotation transmission shaft, 10b ... saw receiver Flange, 10c: Saw presser flange, 11 ... Mounting bolt, 11 ... Bolt protection cover, K, K1, K2 ... Annular wall.

Claims (4)

In the chip saw for brush cutting in which a plurality of chip fixing portions are formed on the outer peripheral edge of the disk-shaped base metal, and the chips are respectively brazed to the chip fixing portions,
The base metal, mounting holes to brush cutter is formed in its central portion, the outer peripheral side of the mounting flange of the mowing machine on the surface of the mounting surface to the mowing machine of the outer peripheral side of the mounting hole At the position, a substantially hemispherical convex portion protruding in the direction of the brush cutter is integrally formed by drawing of the press ,
A plurality of the convex portions are formed on a circumferential line centering on the attachment hole of the base metal, thereby forming an annular wall portion having a curved upper surface when the base metal rotates at a predetermined rotational speed. A chip saw for brush cutting, characterized in that it is obtained . A plurality of the convex portions are respectively formed on a plurality of circumferential lines centering on the attachment hole of the base metal, and a protrusion on the outer circumferential line is located between the convex portions on the inner circumferential line. 2. A chip saw for brush cutting according to claim 1, wherein By discriminating the protrusions by shape and color, the annular wall formed by the rotating protrusions can display a state corresponding to the rotation speed when the base metal rotates at a predetermined rotation speed. 3. A cutting saw tip saw according to claim 1 or 2, characterized in that:   4. The chip saw for brush cutting according to claim 1, wherein a light-weight hole having a smaller diameter than an outer shape of the convex portion is formed between the plurality of convex portions.

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