JP2011217712A - Chip saw for bush and grass clearing, and its production method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chip saw for bush and grass clearing in which a mounting bolt to a bush and grass clearing machine is protected and abrasion of a head or the like is controlled, the exchange working of the chip saw to the bush and grass clearing machine is performed smoothly, and the brazing area of a chip to a chip fixing part at the tip of a blade edge part is widened to suppress deterioration of sharpness, and to provide its production method.SOLUTION: A base metal of the chip saw includes: a flat part in the center part of which an attaching hole to a bush and grass clearing machine is formed; a stepped part formed in an outside of the flat part in the condition of projecting in the opposite side of the grass clearing machine; and a blade edge part extended nearly parallel with the flat part towards a blade edge part tip direction of the base metal outside of the stepped part. The height of the stepped part is set larger than the protrusion dimension of the mounting bolt when the flat part is attached to the bush and grass clearing machine by a mounting bolt. Moreover, the chip is characterized in that sword guards are each formed in both sides of the thickness direction of a fixing face to a chip fixing part of the base metal.

Description

  TECHNICAL FIELD The present invention relates to a cutting saw for saw cutting and a method for manufacturing the same, which is used when cutting a weed, a miscellaneous tree or the like by being attached to a brush cutter.

  Conventionally, as a chip saw for brush cutting, for example, those shown in FIGS. 10 and 11 are known. As shown in FIG. 10, in the tip saw 101, a mounting hole 103 to the brush cutter 104 is formed in a flat portion 102a at the center portion of a disk-shaped base metal 102, and a lower portion around the outer side of the flat portion 102a. An annular bulging portion 102b that swells is formed. Further, a blade edge portion 102c is formed on the outer side of the bulging portion 102b of the base metal 102 in a state of being warped toward the flat portion 102a.

  And as shown to Fig.11 (a), (b), the chips | tips 106 and 107 are brazed to the chip | tip fixed part 105 at the front-end | tip part 102c of the base metal 102, respectively. That is, the chip fixing portion 105 in FIG. 11A is formed in a stepped shape, and the two fixing surfaces 106 c and 106 d of the chip 106 are brazed to the chip fixing portion 105. In addition, the chip fixing portion 105 in FIG. 11B is formed in a recessed groove shape, and a semicircular arc-shaped fixing surface composed of three fixing surfaces 107c to 107e of the chip 107 is brazed to the chip fixing portion 105. Has been. For example, Patent Document 1 discloses a tip saw in which a tip is brazed to the tip of the base of the base metal.

Japanese Utility Model Publication No. 06-24429

  However, in such a tip saw 101, the mounting bolt 108 to the brush cutter 104 can be positioned in the recess inside the bulging portion 102b, and the head of the mounting bolt 108 is exposed to the outside. However, the cutting performance of miscellaneous trees and the like due to the chips 106 and 107 (blade edges) brazed to the blade edge portion 102c of the base metal 102 is inferior. have.

  That is, in the case of the tip saw 101, a manufacturing method is adopted in which after the tips 106 and 107 are brazed to the cutting edge portion 102c of the base metal 102, the bulging portion 102b is formed by press (drawing) processing. With the spring back of the gold 102, the outside of the bulging portion 102b of the base metal 102 is warped upward in FIG. As a result, the protruding direction of the tips 106 and 107, which are the blade tips, is at an angle with respect to the flat portion 102a of the base metal 102 and does not become a plane in substantially the same direction as the flat portion 102a. Therefore, the cutting performance is inferior.

  Further, when the tips 106 and 107 to be brazed to the tip fixing portion 105 at the tip of the cutting edge 102c of the base metal 102 are brazed in the form shown in FIG. Although the surface 106a can be secured large, the brazing area (fixed area) is small and the chip 106 is likely to fall off. On the contrary, when brazing is performed in the form shown in FIG. 11B, the brazing area can be increased to some extent, but the area of the scooping surface 107a of the chip 107 serving as a cutting edge tends to be small, and the sharpness is improved. In addition, it is difficult to extend the life of the tip saw 101 by re-polishing the tip 107, and the tip saw 101 of any form has advantages and disadvantages.

  The present invention has been made in view of such circumstances, and its purpose is to protect the mounting bolts to the brush cutter to suppress head wear and the like, and to replace the tip saw with the brush cutter. It is an object of the present invention to provide a chip saw for brush cutting and a method for manufacturing the same which can be smoothly performed and can insert a chip into a miscellaneous tree or the like at right angles to obtain a good sharpness. In addition to the above purpose, the other object is to increase the brazing area of the tip with respect to the tip fixing portion at the tip of the base metal, and to secure a sufficiently large scooping surface to suppress the deterioration of the sharpness. It is an object of the present invention to provide a cutting saw capable of extending its life and a manufacturing method thereof.

  In order to achieve such an object, the invention according to claim 1 of the present invention is such that a tip fixing portion is formed at the tip of the blade tip of the disk-shaped base metal, and a scooping surface and a tip surface are formed on the tip fixing portion. In addition, in the tip saw for brush cutting with the tip having a fixing surface brazed, the base metal has a flat portion in which a mounting hole for a brush cutter is formed in the central portion thereof, and an anti-trib brush on the outside of the flat portion. A step part formed in a state of projecting to the machine side, and a cutting edge part extending outside the step part in a direction parallel to the flat part toward the tip of the cutting edge part of the base metal, the step part When the flat portion is attached to the brush cutter with a mounting bolt, the height is set to be larger than the projecting dimension of the mounting bolt.

  The invention described in claim 2 is characterized in that a bolt protection cover that covers the mounting bolt is attached to a space inside the step portion at the flat portion. Furthermore, the invention described in claim 3 is characterized in that the chip is formed with ridges on both sides in the thickness direction of the fixing surface to the chip fixing part of the base metal. In this case, the ridge is preferably formed in a substantially L shape in a side view as in the invention described in claim 4.

  According to a fifth aspect of the present invention, a tip fixing portion is formed at the tip of the cutting edge of a disk-shaped base metal, and a tip having a scooping surface, a tip surface and a fixing surface is brazed to the tip fixing portion. In the manufacturing method of the chip saw for brush cutting, the base material is pressed, a flat part in which a mounting hole for the brush cutter is formed in the center part, and the anti-brusher side outside the flat part Forming a step portion formed in a projecting state and a cutting edge portion extending substantially parallel to the flat portion toward the tip end direction of the cutting edge portion on the outside of the step portion, and obtained in the step A step of heat-treating the base metal, and a step of brazing the tip to the tip fixing portion at the tip of the blade edge after the heat treatment. In this case, it is preferable that the flat portion and the blade edge portion are set substantially parallel by performing the heat treatment step in a heated and pressurized state as in the invention described in claim 6.

  According to the first aspect of the present invention, the base metal includes a flat portion, a step portion, and a blade edge portion extending substantially parallel to the flat portion, and the height of the step portion cuts the flat portion. When the mounting bolt is attached to the dispenser with a mounting bolt, it is set to be larger than the protruding dimension of the mounting bolt. Therefore, a circular recess is formed in the flat portion of the base metal by the step portion, and the mounting bolt is positioned in this recess. It is possible to protect and suppress wear of the head, etc., and the tip saw can be replaced with a brush cutter smoothly. It can be put at a right angle and a good sharpness can be obtained.

  Further, according to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since the bolt protective cover that covers the mounting bolt is attached to the space inside the step portion at the flat portion, The cover can securely protect the head of the mounting bolt and the like, and the tip saw can be replaced more smoothly with the brush cutter.

  Further, according to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the ridges are formed on both sides of the chip in the thickness direction of the fixing surface to the chip fixing part of the base metal. Since it is formed, the brazing area of the chip to the chip fixing part of the base metal can be increased by the ridges on both sides to suppress chipping and secure a sufficiently large scooping surface on the chip itself. Thus, for example, the chip can be re-polished, and the life of the chip saw can be extended by suppressing the deterioration of the sharpness of the chip saw.

  According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, since the ridge of the chip is formed in a substantially L shape in side view, the chip is fitted into the chip fixing portion. Can be easily and reliably performed, and a larger brazing area can be secured while improving the efficiency of the brazing operation.

  According to the invention of claim 5, a step of pressing a base metal material to form a flat portion, a stepped portion, and a blade edge portion, and a step of heat-treating the base metal obtained in the step, And a step of brazing the chip after the heat treatment, the step portion forms a circular recess around the mounting hole for the base metal brush cutter, and the mounting bolt is protected by this recess to cover the head. It is possible to suppress wear and the like of the part, and to smoothly perform the replacement work of the tip saw with the brush cutter, etc., and to prevent warping of the blade edge part, and to easily manufacture a chip saw having a good sharpness. it can.

  Further, according to the invention described in claim 6, in addition to the effect of the invention described in claim 5, the flat part and the blade edge part are set substantially parallel by performing the heat treatment step in a heated and pressurized state. Therefore, the flatness of the flat part of the base metal and the flatness of the blade edge part can be surely ensured, and a chip saw with a better sharpness can be obtained.

  The top view which shows the chip saw concerning this invention   The AA line arrow figure   Part B enlarged view of Fig. 1   CC line view of FIG. 3   Front view, plan view, and side view of the chip   Process chart showing an example of the manufacturing method of the same   The figure which shows the attachment state to the same brush cutter   The figure which shows the modification of the attachment state   The figure which shows the modification of the chip | tip   The figure which shows the attachment state to the brush cutter of the conventional tip saw   The figure which shows the adhering state of the conventional tip

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
1 to 7 show an embodiment of a cutting blade 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 base metal 2 having a disk shape and a large number of lightweight holes 3 formed at the center of the base metal 2. Is formed with a mounting hole 4 to a brush cutter 5 to be described later.

  Further, the base metal 2 is formed with a flat portion 2a having a predetermined width outside the mounting hole 4, and the height dimension is directed toward the downward diagonal direction of FIG. h A protruding step 2b is formed, and a flat cutting edge 2c is formed outside the step 2b. The base metal 2 is formed with a hollow portion 6 having a circular shape when viewed from the back by the stepped portion 2b, and the flat portion 2a and the blade edge portion 2c are formed in parallel, thereby forming a cutting edge. The direction in which the chip 7 is directed (the outward protruding direction) and the flat portion 2a are set to be parallel (a plane in the same direction).

  In addition, a large number of blade chambers (gallets) 8 and chip fixing portions 9 (see FIG. 3) are formed at regular intervals at the tip of the cutting edge portion 2c of the base metal 2, and each chip fixing portion 9 is made of cemented carbide. The chip 7 is brazed. At this time, as shown in FIGS. 3 to 5, the chip 7 is formed to have a scooping surface 7a, a tip surface 7b, and four fixing surfaces 7c to 7f, and the thickness of the three fixing surfaces 7c to 7e. On both sides in the direction, ridges 7g are formed in a substantially L shape in a side view. Further, the chip fixing portion 9 is formed in a recessed shape corresponding to the shape of each fixing surface 7c to 7f of the chip 7.

  The chip 7 is brazed to the chip fixing portion 9 of the base metal 2 as follows. That is, by inserting the chip 7 into the chip fixing portion 9 of the base metal 2 from the direction of the arrow A in the figure, the base metal 2 is sandwiched between the pair of flanges 7g of the chip 7 as shown in FIG. In this state, the four fixing surfaces 7c to 7f and the inner surfaces of the pair of flanges 7g are brazed. Thereby, the brazing area with respect to the chip fixing part 9 of the chip 7 is greatly expanded. As shown in FIG. 4, the chip 7 fixed to the chip fixing portion 9 of the base metal 2 has a flange 7g projecting from the both side surfaces of the base metal 2 by a predetermined dimension. It has become.

  Next, an example of a manufacturing method of the tip saw 1 will be described based on the process diagram of FIG. In the tip saw 1, first, a base material (raw material such as a carbon steel plate) is processed (K01) by press drawing to have the flat portion 2a, the stepped portion 2b, the blade chamber 8, and the tip fixing portion 9. The part 2c is molded. At the time of drawing, the dimensions of the recess 6 shown in FIG. 2 are R1 = 4 to 10 mm (preferably 5 mm) on the edge 2c side, and R2 = 5 to 15 mm (preferably on the flat part 2a side). 6 mm), the diameter of the flat portion 2a is set to φ1 = 85 mm, the diameter of the hollow portion 6 is set to φ2 = 125 mm, and the dimension h is set to 19 mm or more when the dimension h is 19 mm. The diameter (outer diameter) d of the base metal 2 is set to d = 255 mm or d = 230 mm, for example. With these dimension settings, even when a base metal material made of a carbon steel plate name or the like is drawn, cracks and the like of the recessed portion 6 are prevented, and swinging and tilting of the cutting edge portion 2c are suppressed.

  Then, after the base metal material is processed to produce the base metal 2, a heat treatment (K02) is performed in which the base metal 2 is quenched and annealed using, for example, high-frequency induction heating. By performing the base metal 2 in a heated and pressurized state during this heat treatment, warpage of the flat portion 2a and the blade edge portion 2c is prevented, and the flat portion 2a and the blade edge portion 2c parallel to each other are formed. After the heat treatment of the base metal 2 is finished, for example, a surface treatment (K03) by shot blasting is performed, and after this surface treatment, the chips 7 are placed on the chip fixing portions 9 of the base metal by using, for example, high frequency induction heating. Brazing (K04).

  Then, the chip saw 1 is manufactured by polishing (K05) and finishing (K06) the scooping surface 7a, the tip surface 7b, and both side surfaces of the chip 7. In other words, in the case of the tip saw 1, the base 2 before the tip 7 is brazed is heat-treated in a heated and pressurized state, so that the flat portion 2 a and the blade edge portion 2 c can be prevented from warping due to the spring back. In addition, it becomes possible to obtain a parallel state between the flat portion 2a and the blade edge portion 2c.

  As shown in FIG. 7, the tip saw 1 configured in this way is connected to a saw receiving flange 5 b at the tip of the rotation transmission shaft 5 a of the brush cutter 5 via a saw retaining cover 5 c, a saw retainer flange 5 d and a mounting bolt 10. Attached. At the time of this attachment, the surface of the tip saw 1 on the side opposite to the cutting edge 2c of the flat portion 2a is brought into contact with the surface of the saw receiving flange 5b so that the mounting bolt 10 is located in the recess 6 of the tip saw 1, At this time, due to the height dimension h of the stepped portion 2b, the head of the mounting bolt 10 is positioned in the recessed portion 6 so as not to protrude outward (downward in FIG. 7).

  The width of the flat portion 2a of the tip saw 1 (the effective flat portion width is the dimension φ1) is set larger than the outer diameter of the saw receiving flange 5b of the brush cutter 5, and the flat portion 2a is set to the saw receiving flange. It is in the state closely_contact | adhered to the whole region of the flange surface of 5b. When the tip saw 1 is rotated by operating the brush cutter 5 in this attached state, the tip 7 at the tip of the blade edge portion 2c enters, for example, a substantially right angle with the miscellaneous tree, and the miscellaneous tree is cut smoothly. Become.

  By the way, in the attachment state to the brush cutter 5 in FIG. 7, for example, as shown in FIG. 8, the bolt protection cover 11 may be attached in the recess portion 6. In this case, for example, the outer peripheral edge portion of the bolt protection cover 11 formed in a substantially dish shape may be attached so as to be pressed by the saw pressing flange 5d or the like. Further, on the bottom surface of the bolt protection cover 11, a ring-shaped recess 11a for smooth rotation of the protection cover itself is formed as necessary.

  As described above, according to the tip saw 1, the base metal 2 includes the flat portion 2a, the step portion 2b, and the cutting edge portion 2c extending in parallel to the flat portion 2a, and the height dimension h of the step portion 2b is flat. When the portion 2a is attached to the brush cutter 5 with the mounting bolt 10, the circular recess 6 is formed in the flat portion 2a of the base metal 2 by the step portion 2b because it is set larger than the protruding dimension of the mounting bolt 10. It is formed, and the mounting bolt 10 can be protected by the recess 6 to suppress the wear and deformation of the head, and the mounting bolt 10 can be properly rotated when the tip saw 1 is attached to or removed from the brush cutter 5. The tip saw 1 can be exchanged smoothly.

  In addition, since the cutting edge 2c that affects the cutting performance is set parallel to the flat part 2a, the tip 7 as the cutting edge and the flat part 2a (attachment surface to the brush cutter 5) have an angle as in the conventional case. The chip 7 can be prevented from entering obliquely into the miscellaneous tree, the chip 7 can be inserted into the miscellaneous tree or the like at a substantially right angle, and a good sharpness can be easily obtained in the chip saw 1. Further, if the bolt protection cover 11 that covers the mounting bolt 10 is attached to the recess 6 inside the stepped portion 2b with the flat portion 2a, the head of the mounting bolt 10 and the like are more reliably protected by the bolt protection cover 11. Therefore, the replacement work of the tip saw 1 with respect to the brush cutter 5 can be performed more smoothly.

  Further, since the flanges 7g are formed on both sides in the thickness direction of the chip 7, the brazing area of the chip 7 with respect to the chip fixing portion 9 can be increased by the flanges 7g on both sides, and the fixing strength of the chip 7 can be increased. The chip saw 1 can be prevented from dropping off, and the chip saw 1 can be re-polished, for example, by securing a sufficiently large scooping surface 7a on the chip 7 itself. It is possible to extend the lifetime by suppressing

  Further, since the flange 7g of the chip 7 is formed in a substantially L shape in side view, the chip 7 can be easily fitted into the chip fixing portion 9 and the distance between the pair of flanges 7g can be reduced. By setting substantially the same as the gold 2, the positional relationship between the chip 7 and the base metal 2 is uniquely determined, and the set-up dimensions w1 and w2 can be set easily and reliably. The efficiency of work and the like can be improved, and the cost of the tip saw 1 can be reduced.

  When the cutting performance of the tip saw 1 set to each of the above dimensions was tested, a recess 6 by a stepped portion 2b was formed in the base metal 2, and the tip 7 as a cutting edge and the brush cutter 5 of the tip saw 1 were formed. Since the flat portion 2a, which is the mounting surface, is separated with the predetermined height dimension h described above, weeds and the like are entangled with the rotating shaft portion of the brush cutter 5 during the brush cutting operation. There is little or no pebbles or the like can be skipped by the recess 6, and the rigidity of the base metal 2 is increased by the recess 6. It has been confirmed that good cutting performance can be obtained.

  On the other hand, for example, in the conventional tip saw 101 as shown in FIG. 10, the flat portion 102a, which is the mounting surface of the brush cutter 104, and the cutting edge are on the same surface. Even if a disc-shaped anti-winding plate (not shown) is attached to the brush cutter 104 side of the rotating shaft portion in order to prevent the winding shaft 104 from being wound around the rotating shaft portion, the cutting edge of the tip saw 101 and the cutting blade are removed. It is difficult to secure a sufficient dimension between the rotary shaft portion of the machine 104 and it is difficult to obtain good cutting performance on the tip saw 101.

  Further, the chip saw 1 presses the base metal material to form the flat portion 2a, the stepped portion 2b, and the blade edge portion 2c, the step of heat-treating the base metal 2 obtained in the step, and the heat treatment Since it is manufactured by the process of brazing the tip 7, etc., the mounting bolt 10 can be protected to suppress head wear and the like, and the replacement work for the brush cutter 5 can be performed smoothly, or the cutting edge 2c. It is possible to easily and inexpensively manufacture the tip saw 1 that can prevent warping and obtain a good sharpness.

  In particular, when the base metal material is drawn, by setting the rounded dimensions R1 and R2 of the indented portion 6 to the above-described dimensions, even when a carbon steel plate is used as the base metal material, cracks in the indented portion 6 during processing, etc. Can be prevented, and the cost increase of the base metal 2 can be suppressed as much as possible. Moreover, since the flat part 2a and the blade edge | tip part 2c are set in parallel by performing the process to heat-process in a heating-pressing state, the parallelism of the flat part 2a and the blade edge | tip part 2c can be ensured easily and reliably, The chip saw 1 having a better sharpness can be obtained at low cost.

  In the above-described embodiment, the chip 7 is formed to have the four fixing surfaces 7c to 7f. However, the present invention is not limited to this, and is configured as shown in FIGS. 9A and 9B, for example. You can also. That is, the chip 7 shown in (a) has three fixing surfaces 7c to 7e, and the flanges 7g are formed in an L shape in side view on both sides of the fixing surfaces 7c and 7d. Further, the chip 7 shown in (b) has two fixing surfaces 7c and 7d, and a flange 7g is formed in an L shape in side view on both sides of the fixing surfaces 7c and 7d. Thus, the chip 7 used in the chip saw 1 of the present invention may have a form having two or more fixing surfaces and having the flanges 7g on both sides thereof.

  Moreover, in the said embodiment, although the case where the flat part 2a and the blade edge | tip part 2c were completely parallel was demonstrated, the blade edge | tip of the flat part 2a and the blade edge | tip part 2c of this invention can enter a substantially right angle to a miscellaneous tree etc. As long as it is generally parallel. Further, the number and shape of the chip fixing portions 9, the width of the flat portion 2a of the base metal 2, the height dimension h of the stepped portion 2b, etc. in the above embodiment are also examples, and the gist relating to each invention of the present invention is as follows. An appropriate configuration can be employed without departing from the scope.

  INDUSTRIAL APPLICABILITY The present invention can be used in all cutting tip saws that are used for cutting away weeds and the like with a tip fixed to the tip of the blade tip of a disk-shaped base metal.

  DESCRIPTION OF SYMBOLS 1 ... Chip saw for brush cutting, 2 ... Base metal, 2a ... Flat part, 2b ... Step part, 2c ... Cutting edge part, 4 ... Mounting hole, 5 ... Brush cutting Machine: 6 ... depression, 7 ... tip, 7a ... scooping surface, 7b ... tip surface, 7c-7f ... fixing surface, 7g ... scissors, 8 ... blade chamber , 9... Chip fixing part, 10... Mounting bolt, 11... Bolt protection cover, h.

Claims (6)

In the tip saw for brush cutting in which the tip fixing part is formed at the tip of the cutting edge of the disk-shaped base metal, and the chip having a scooping surface, the tip end surface and the fixing surface is brazed to the tip fixing part.
The base metal has a flat portion in which a mounting hole for a brush cutter is formed in a central portion thereof, a step portion formed in a state of projecting toward the anti-trimmer side on the outside of the flat portion, and the step portion. A blade edge portion extending substantially parallel to the flat portion toward the tip direction of the blade edge portion of the base metal, and the height of the stepped portion is attached to the brush cutter with a mounting bolt. The tip saw for brush cutting is set to be larger than the protruding dimension of the mounting bolt.   The tip saw for brush cutting according to claim 1, wherein a bolt protection cover that covers the mounting bolt is attached to a space inside the step portion at the flat portion.   3. A chip saw for brush cutting according to claim 1, wherein said chips are formed with hooks on both sides in a thickness direction of a fixing surface to a chip fixing portion of a base metal.   The cutting saw according to claim 3, wherein the ridge is formed in a substantially L shape in a side view. In the manufacturing method of the tip saw for brush cutting in which the tip fixing portion is formed at the tip of the blade tip portion of the disk-shaped base metal, and the tip having the scooping surface, the tip surface and the fixing surface is brazed to the tip fixing portion.
A flat part in which a base metal material is pressed and a mounting hole for a brush cutter is formed in the center part thereof, and a step part formed in a state of projecting toward the anti-brusher side outside the flat part. A step of forming a blade edge portion extending substantially parallel to the flat portion toward the tip end direction of the blade edge portion on the outside of the step portion, a step of heat-treating the base metal obtained in the step, and the heat treatment And a step of brazing each of the tips to the tip fixing portion at the tip of the blade edge portion later.   6. The method for manufacturing a cutting saw according to claim 5, wherein the heat treatment is performed in a heated and pressurized state so that the flat portion and the blade edge portion are set substantially parallel to each other.

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