JP5582386B2 - Chip saw and manufacturing method thereof - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a tip saw in which a base metal cutting edge portion and a cutting edge having a carbide tip are provided at an outer peripheral edge portion of the base metal, and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, a tip saw in which a tip as a blade tip is fixed by brazing to an outer peripheral edge portion of a disk-shaped base metal is disclosed in Patent Document 1, for example. As shown in FIGS. 7A and 7B, the tip saw 101 has a large number of blade chambers 103 (gallets) formed at regular intervals on the outer peripheral edge portion 102a of a disk-shaped base metal 102 made of a carbon steel plate or the like. In addition, a chip fixing portion 104 is formed between the blade chambers 103. Then, each chip fixing portion 104 is brazed with a cemented carbide chip 105 made of a cemented carbide such as tungsten and cobalt and having a rake face, a tip face, and a set-up dimension h.

Utility Model Registration No.2530063

  However, in such a tip saw 101, the cutting edge that functions as the blade of the tip saw 101 is formed by the carbide tip 105, and the thickness t <b> 2 of the carbide tip 105 is ensured in order to secure the settling dimension h that is an element of the tip saw 101. Is set to be larger than the plate thickness t1 of the base metal 102, and it is necessary to project a predetermined dimension from both side surfaces (front and back surfaces) of the base metal 102. For this reason, stone or concrete hits the protruding portion of the carbide tip 105 during the cutting operation, cracks occur in the carbide tip 105 or the carbide tip 105 falls off the base metal 102, and the cutting edge has a long period of time. Therefore, it is difficult to obtain a predetermined cutting performance, and the life of the tip saw 101 is likely to be reduced.

  Further, since the carbide tip 105 itself functions as the cutting edge of the tip saw 101, it is necessary to enlarge the carbide tip 105 itself in order to obtain a predetermined cutting performance. The fixing area between the hard chip 105 and the chip fixing part 104 of the base metal 102 is also increased, and the amount of silver brazing used when brazing the carbide chip 105 is increased or the brazing operation time is increased. As a result, the cost of the chip saw 101 is likely to increase.

  Further, since the shape of the cemented carbide tip 105 is large, the purity of the base metal 102 as a steel material is lowered by the brazed cemented carbide chip 105 when the used chipsaw 101 is recycled. 101 recycling cost is easy to increase. In addition, the use of a large carbide tip 105 increases the amount of rare metals such as tungsten, cobalt, silver low, etc., which is not preferable in terms of resource environment, and at the same time, the outer peripheral edge of the base metal 102 when the chipsaw 101 is manufactured. When a polishing process for polishing both the side surfaces of 102a and the cemented carbide tip is required, a large amount of polishing waste is likely to be generated, which is not preferable in terms of the working environment when the chipsaw 101 is manufactured.

  The present invention has been made in view of such circumstances, and its purpose is to reduce the size of the cemented carbide tip as much as possible to obtain stable cutting performance over a long period of time. An object of the present invention is to provide a chip saw that is environmentally favorable, such as the environment, and a method for manufacturing the same.

In order to achieve this object, the invention according to claim 1 of the present invention is a tip saw in which the cutting edges are provided at predetermined intervals on the outer peripheral edge of a disk-shaped base metal having a mounting hole formed in the center. The cutting edge is brazed to a base metal cutting edge portion having a rake face and a tip surface on the base metal itself and formed into a chip shape, and a tip fixing portion at the tip of the base metal blade edge part. And a cemented carbide tip formed in a straight line with the rake face and tip surface of the base metal cutting edge, and the base end side of the base metal cutting edge adjacent to the cutting edge is on both sides of the base metal A predetermined settling dimension is secured to the cutting edge by alternately bending the surface, and the protruding surface from the base metal side of the chip fixing part side of the bent base metal blade edge part is parallel to the base metal side surface. The projecting surface is formed by a polished surface .

The invention according to claim 2 is characterized in that the thickness of the cemented carbide chip is set to be substantially the same as the thickness of the base metal . Furthermore, the invention described in claim 3 is characterized in that both side surfaces of the base metal are painted and the ground surface of the protruding surface is exposed .

According to a fourth aspect of the present invention, there is provided a tip saw in which a base metal blade tip and a blade tip having a carbide tip are provided at predetermined intervals on the outer peripheral edge of a disk-shaped base metal having a mounting hole formed in the center. The base metal side of the base metal blade edge part adjacent to the blade edge is alternately bent with respect to both side surfaces of the base metal. A step of forming a base metal blade edge portion in which a predetermined surface dimension is secured at the blade edge and a bent surface of the bent base metal blade edge portion from the base metal side surface on the tip fixing portion side is parallel to the base metal side surface ; a step of brazing the carbide inserts on the chip fixing portion of the base metal blade edge, and the step of polishing the side surface of the protruding surface and hard tip of the base metal cutting edge, of the hard tip and the base metal blade edge And a step of polishing the rake face and the tip face.

According to the invention described in claim 1 or 3 of the present invention, the cutting edge provided on the outer peripheral edge of the base metal has a scooping surface and a tip surface on the base metal itself and is formed into a chip shape. Since it consists of a gold cutting edge and a carbide tip brazed to the tip fixing part at the tip of this base metal cutting edge, the base metal itself can be used as a part of the cutting edge, and the size of the carbide tip is minimized. In addition to being able to obtain stable cutting performance over a long period of time with the cemented carbide tip, by using a cemented carbide tip having a small shape, it is possible to form a tip saw at low cost, and to improve the environment such as the resource environment and the working environment. A preferable tip saw can be obtained.

In addition, since the base metal blade edge portions adjacent to each other are projected and formed alternately with respect to the both side surfaces of the base metal, it is possible to reliably secure the horizontal dimensions on each blade edge, and to improve the sharpness of the tip saw. The lifetime can be extended while improving.

In addition, since the protruding surface of each base metal cutting edge is formed by a polishing surface parallel to both side surfaces of the base metal, it is possible to polish the side surface of the cutting edge simply by polishing one protruding surface of the base metal cutting edge. The polishing area can be reduced, the workability of the polishing work can be improved, the manufacturing cost can be reduced, and the generation amount of polishing scraps can be reduced to suppress the deterioration of the working environment.

According to the invention described in claim 2 , in addition to the effect of the invention described in claim 1 , since the thickness of the carbide chip is set to be substantially the same as the thickness of the base metal, the carbide chip The size (volume) of the metal can be further reduced to further reduce the amount of rare metal used, and the generation amount of polishing scraps during side polishing of the base metal blade tip can be further reduced.

According to the invention described in claim 4 , the step of forming the cutting edge whose projecting surface for securing the settling dimension is parallel to both side surfaces of the base metal, and the step of brazing the carbide tip to the tip fixing portion and to provide a process such as polishing the side surface and the rake surface and front end surface of the hard tip and the protruding surface of the base metal blade edge, can be used base metal itself as part of the cutting edge, the size of the hard tip as much as possible It can be made small and stable cutting performance can be obtained for a long time with the cemented carbide tip, and the use of a small shaped tip and each process can reduce the manufacturing cost of the tip saw, while the resource environment and the working environment etc. An environmentally preferable tip saw can be easily obtained.

  The top view which shows one Embodiment of the chip saw concerning this invention   1 is an enlarged view of the main part of FIG.   The side view   Enlarged view of part A in Fig. 3, which is the cutting edge   Enlarged view showing a variation of the cutting edge   Process chart showing an example of the manufacturing method of the same   The principal part top view which shows the conventional chip saw, and its side view

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 tip saw according to the present invention. As shown in FIG. 1, the tip saw 1 is formed in a disk shape by pressing a carbon steel plate, and a large number of light weight holes 3 for lightening are formed in an annular shape, and at the center to a brush cutter (not shown). The base metal 2 in which the mounting holes 4 are formed is provided. A large number of blade chambers 5 and blade edges 6 are provided at regular intervals on the outer peripheral edge 2 a of the base metal 2.

  As shown in FIGS. 2 to 4, the cutting edge 6 has a rake face 6a having a rake angle θ1 and a tip face 6b having a tip angle θ2 by molding the base metal 2 itself, and the rake face 6a and the tip face 6b. Are set to be substantially the same length. The cutting edge 6 includes a rake face 7a and a tip face 7b (see FIG. 4), and a base metal cutting edge part 7 in which a recessed tip fixing portion 7c is formed at the tip of the cutting edge 6 which is a crossing part of these tips. have. A cemented carbide tip 8 formed by sintering dungsten, cobalt or the like is brazed to the chip fixing portion 7c of the base metal cutting edge portion 7.

  At this time, the cemented carbide tip 8 has a substantially U-shaped fixing surface 8c (see FIG. 4) in plan view corresponding to the shape of the chip fixing portion 7c of the base metal cutting edge portion 7, and both ends of the fixing surface 8c. The rake face 7a and the tip face 7b of the base metal cutting edge 7 and the rake face 8a and the tip face 8b formed on a straight line are formed. That is, the rake face 6a of the cutting edge 6 is formed by both the rake faces 7a and 8a of the base metal cutting edge portion 7 and the carbide tip 8, and the cutting edge 6 is formed by both the tip edge faces 7b and 8b of the base metal cutting edge section 7 and the carbide tip 8. The tip surface 6b is formed.

Further, as shown in FIG. 3, the carbide tip 8 is set to have a thickness slightly larger than or equal to the thickness of the base metal 2, and as shown in FIGS. Is set to be smaller than the area S2 of the base metal cutting edge 7 (for example, S1 = 1/2 to 1/4). By setting the area, the size of the cemented carbide tip 8 used as the cutting edge 6 becomes smaller than the conventional one, and the ratio of the area is appropriately determined according to required quality such as cutting performance and life of the tip saw 1. Is set to

  Moreover, the adjacent blade edge | tip 6 among each blade edge | tip 6 has crushing dimensions h1 and h2 in the direction which is alternately different with respect to the both-sides surfaces 2b and 2c of the base metal 2, as shown in FIG. 2c is formed to protrude outside. That is, by bending the base end side 7d of the base metal blade edge portion 7 of the blade edge 6 in the direction of the one side surface 2b of the base metal 2 by press working or the like as will be described later, the cutting edge 6 is secured in the crushing dimension h1. By bending the base end side 7 d of the base metal cutting edge portion 7 of the cutting edge 6 in the direction of the other side surface 2 c of the base metal 2, the cutting edge 6 is secured in the settling dimension h 2.

  At this time, the protruding surface, which is the outer surface on the tip fixing portion 7c side that is the tip side of the bent base metal cutting edge portion 7, is formed so as to be substantially parallel to both side surfaces 2b and 2c of the base metal. The ground surface of the base metal 2 is exposed by polishing as will be described later, and the protruding surface is a polished surface 9 that is visible as a metal surface in substantially the same manner as the cemented carbide chip 8. In addition, the non-protruding surface opposite to the protruding surface of the base metal cutting edge portion 7 is a non-polished surface 10, and a state in which, for example, a black painted surface is applied to both side surfaces 2b and 2c of the base metal 2 is exposed. It has become. That is, as shown in FIG. 1, when viewed from one side surface 2 b (or side surface 2 c) of the tip saw 1, a large number of cutting edges 6 have the polishing surface 9 and the non-polishing surface 10 of each cutting edge 6 alternately positioned. It is in a state.

  Next, an example of a method for manufacturing the tip saw 1 will be described with reference to FIG. First, by press-working a carbon steel plate, the base metal 2 having a disk shape and having the blade chamber 5 and the blade edge 6 (chip fixing portion 7c) formed on the outer peripheral edge 2a is press-formed (K01). 2 is heat-treated at a predetermined temperature (K02). Thereafter, the cutting edge 6 is formed (K03) by press working in a heated state, for example. The cutting edge 6 is formed by using a press machine or a dedicated jig (mold or the like) that can obtain the set-up dimensions h1 and h2 by heating the cutting edge 6 of the base metal with resistance heating, high-frequency induction heating, or heating with a gas torch. It is performed by bending the tip side of each blade edge 6 in a predetermined direction while using a jig.

  When the cutting edges 6 with the cut dimensions secured in step K03 are formed, the respective cutting edges 6 are quenched by high-frequency induction heating (K04), and a predetermined hardness (for example, HRC 55-60) is secured in each cutting edge 6. Thereafter, the cemented carbide tip 8 formed in advance in a predetermined shape was brazed (K05) to the chip fixing portion 7c of the base metal cutting edge portion 7 of each quenched cutting edge 6, and the cemented carbide tip 8 was brazed. For example, black paint (K06) is applied to both surfaces of the base metal 2 to conceal the material color of the base metal 2 and the like.

  Then, after the paint is dried, both side surfaces of the blade edge 6 are polished (K07). In this side surface polishing, the adjacent cutting edge 6 of the base metal 2 has settling dimensions h1 and h2 and protrudes to the both side surfaces 2b and 2c side of the base metal 2, so that one side surface 2b of the base metal 2 is formed. By polishing the protruding surface of the protruding blade edge 6, the coating applied to the protruding surface is removed, and the metal color of the carbon steel and the metal color of the carbide tip 8, which are the material colors of the base metal blade edge portion 7, are removed. The surface 9 is exposed to the polishing surface 9. At this time, the anti-projection surface of the blade edge 6 adjacent to the blade edge 6 to be polished is not polished and remains a painted surface in a state of being recessed from the side surface 2b of the base metal. When the polishing on the side surface 2b side is completed, the other side surface 2c side is similarly polished. Thereby, the side surfaces of the base metal cutting edge portion 7 and the carbide tip 8 are simultaneously polished, and the polishing surface 9 and the non-polishing surface 10 are alternately positioned on the respective blade edges 6 on both side surfaces 2b and 2c of the base metal 2, that is, Apparently, every other cutting edge 6 that shines in metallic color is located on the outer peripheral edge 2 a of the base metal 2.

  When the side surface polishing is completed in step K07, the rake face 6a of each blade edge 6 is then polished (K08), and then the tip surface 6b of each blade edge 6 is polished (K09). By grinding the rake face 6a and the tip face 6b, the rake face 7a of the base metal cutting edge 7 and the rake face 8a of the cemented carbide tip 8 become straight (on the same plane). 7b and the tip surface 8b of the carbide tip 8 are linear (on the same plane), and a rake face 6a and a tip face 6b are formed on the cutting edge 6. Also at this time, the rake surfaces 7a and 8a and the tip surfaces 7b and 8b of the base metal cutting edge 7 and the cemented carbide tip 8 are simultaneously polished by one polishing operation similarly to the side surface polishing.

  The cemented carbide tip 8 brazed to the tip fixing portion 7c of the base metal cutting edge portion 7 by the polishing in the steps K07 to K09 has no difference in thickness or outer shape with respect to the base metal cutting edge portion 7. The carbide tip 8 and the base metal cutting edge 7 function as a part of the cutting edge 6 and are visually recognized as one cutting edge 6 by the user. Then, when the polishing of the tip surface 6b of each blade edge 6 is completed in step K07, the tip saw 1 is manufactured by performing finishing (K10) such as cleaning, marking, and packaging.

  In addition, the above manufacturing process is an example, for example, the order of each polishing process is set to a predetermined value, the painting process is omitted, and the side surface of the blade edge 6 has a metal color similar to the background of the base metal 2, Alternatively, the cutting edge 6 that becomes the polishing surface 9 on the side surface to be polished at the time of painting is masked, the coating of the cutting edge 6 is prohibited, and the generation amount of polishing scraps is reduced. It is also possible to employ other appropriate processes for obtaining the above.

  Thus, according to the tip saw 1, a large number of cutting edges 6 provided on the outer peripheral edge 2a of the base metal 2 have the rake face 7a and the tip face 7b by quenching the base metal 2 itself to a predetermined hardness. Since it consists of a base metal cutting edge portion 7 formed in a chip shape and a cemented carbide tip 8 fixed by brazing to a chip fixing portion 7 c at the tip of the base metal blade edge portion 7, the base metal 2 as a part of the blade edge 6. As such, the size of the cemented carbide tip 8 can be reduced to, for example, ½ or less compared to the conventional size. As a result, it is possible to obtain a stable cutting performance over a long period of time by the small-sized cemented carbide tip 8 and the base metal cutting edge 7 and to extend the life of the tip saw 1.

  At the same time, the use of a carbide tip 8 having a small shape reduces the cost of the carbide tip 8 itself using an expensive material, or reduces the amount of silver solder used when brazing the carbide tip 8. In addition, the tip saw 1 can be formed at a low cost, for example, the brazing time can be shortened, the brazing operation itself can be easily performed, and the manufacturing cost can be reduced. In addition, the use of a small carbide tip 8 can reduce the amount of rare metal used, which is preferable in terms of resource environment, and also preferable for the work environment by suppressing deterioration of the work environment during brazing. It is possible to provide a chip saw 1 that is gentle to the environment.

In addition, since the base metal cutting edge portions 7 of the adjacent cutting edges 6 are alternately projected with predetermined settling dimensions h1 and h2 with respect to both side surfaces 2b and 2c of the base metal 2, the settling dimensions are set on the respective cutting edges 6. h1 and h2 can be reliably ensured, and the life of the chip saw 1 can be further extended while improving the sharpness. Moreover, since the protruding surface of each base metal cutting edge portion 7 is formed by the polishing surface 9 parallel to the both side surfaces 2b and 2c of the base metal 2, only one protruding surface of the base metal cutting edge portion 7 is polished. The side of the blade edge can be polished, the polishing area can be reduced, the workability of the polishing operation can be improved, the manufacturing cost of the tip saw 1 can be further reduced, and both sides of the base metal blade edge portions 7 can be reduced. Compared with the case where each surface is polished, the generation amount of polishing debris can be reduced, and deterioration of the working environment can be further suppressed.

  Furthermore, since the thickness of the cemented carbide tip 8 is set to be substantially the same as the thickness of the base metal 2, the size (volume) of the cemented carbide tip 8 is made smaller and the amount of rare metal used is further increased. While being able to reduce, the generation amount of the polishing scraps at the time of side polishing of the base metal cutting edge portion 7 can be further reduced, and the tip saw 1 that is more friendly to the earth can be provided at low cost.

  Moreover, according to the manufacturing method of the tip saw 1 of this invention, the process of shape | molding the blade edge | tip 6, the process of obtaining predetermined | prescribed hardness to the blade edge | tip 6, the process of brazing the cemented carbide tip 8 to the chip | tip fixing | fixed part 7c, the cemented carbide tip 8 The base metal 2 itself can be used as a part of the blade edge 6 and the size of the carbide tip 8 is made as small as possible. It is possible to obtain a stable cutting performance over a long period of time, and it is preferable from the viewpoint of resource environment, working environment, etc. while reducing the manufacturing cost of the tip saw 1 by using a small-sized carbide tip 8 and each process. The tip saw 1 can be easily manufactured.

  Moreover, since the process of grind | polishing the side surface of the blade edge | tip 6 to which the carbide | carbonized_metal chip | tip 8 was fixed is performed by grind | polishing the protrusion surface from the both sides | surfaces 2b and 2c of the base metal 2 of the base metal blade edge | tip part 7, the blade edge | tip 6 is performed. The cutting edge 6 can be easily formed only by the side polishing, and the cutting dimensions h1 and h2 can be surely and easily secured in each cutting edge 6, and the manufacturing cost of the tip saw 1 can be further reduced. Furthermore, since the step of forming the cutting edge 6 having the tip fixing portion 7c on the outer peripheral edge 2a of the base metal 2 is performed while the cutting edge 6 is heated by resistance heating, induction heating, gas torch heating, etc., the base metal 2 The cutting edge 6 can be easily and accurately formed on the outer peripheral edge 2a, and the manufacturing cost of the tip saw 1 can be further reduced.

  In the above embodiment, the case where the rake face 6a and the tip face 6b of the cutting edge 6 have substantially the same length has been described. However, the present invention is not limited to this, for example, as shown in FIG. The length of the surface 6a can be set longer (or shorter) than the length of the tip surface 6b. Further, the shape of the cemented carbide tip 8 (chip fixing portion 7c) fixed to the chip fixing portion 7b of the base metal blade edge portion 7 is also formed in a rhombus in a plan view as shown by a two-dot chain line in FIG. Depending on the quality required for 1, an appropriate shape can be adopted.

Further, the size of the base metal 2, the form of the lightweight hole 3, the number of the blade edges 6, the form of the blade chamber 5 and the base metal blade edge part 7 , etc. in the above embodiment are also examples, and relate to each invention of the present invention. Appropriate configurations can be employed without departing from the scope of the invention.

  The present invention is not limited to the chip saw for cutting and used by being attached to the brush cutter, but can be used for all chip saws having a carbide chip on the outer peripheral edge of the base metal such as a chip saw for cutting woodwork.

  DESCRIPTION OF SYMBOLS 1 ... Tip saw, 2 ... Base metal, 2a ... Outer peripheral edge part, 3 ... Lightweight hole, 4 ... Mounting hole, 5 ... Blade chamber, 6 ... Blade edge, 6a ..Rake face, 6b ... tip face, 7 ... base metal cutting edge, 7a ... rake face, 7b ... tip face, 7c ... tip fixing part, 7d ... proximal end side 8 ... Carbide tip, 8a ... Rake face, 8b ... Tip face, 8c ... Fixing face, 9 ... Polishing face, 10 ... Non-polishing face, h1, h2 ...・ Cream dimension, θ1 rake angle, θ2 tip angle.

Claims (4)

A tip saw in which a cutting edge is provided at a predetermined interval on the outer peripheral edge of a disk-shaped base metal in which a mounting hole is formed at the center,
The cutting edge is brazed to a base metal cutting edge portion having a rake face and a tip surface on the base metal itself and formed into a chip shape, and a chip fixing portion at the tip of the base metal blade edge part. A carbide tip formed on a straight line with a rake face and a tip face of the base metal cutting edge ,
By alternately bending the base end side of the base metal blade edge portion adjacent to the blade edge with respect to both side surfaces of the base metal, a predetermined clearance dimension is ensured in the blade edge and the tip of the bent base metal blade edge portion is secured. A chip saw characterized in that a projecting surface from a base metal side surface on the fixing portion side is formed in parallel with the base metal side surface, and the projecting surface is formed by a polished surface . The tip saw according to claim 1, wherein the thickness of the cemented carbide chip is set to be substantially the same as the thickness of the base metal . The tip saw according to claim 1 or 2, wherein both side surfaces of the base metal are painted and a ground surface of the protruding surface is exposed . A method of manufacturing a tip saw in which a cutting edge having a base metal cutting edge portion and a carbide tip is provided at a predetermined interval on the outer peripheral edge of a disk-shaped base metal having a mounting hole formed in the center,
The blade has a tip fixing portion at the outer peripheral edge of the base metal, and the base edge side of the base metal blade edge adjacent to the blade edge is alternately bent with respect to both side surfaces of the base metal, thereby providing a predetermined roughness on the blade edge. dimension is secured, and folding the steps of the protruding surface of the base metal side of the chip fixing portion of the base metal cutting edge is forming said base metal side and parallel to the base metal cutting portions, of the base metal cutting edge A step of brazing a carbide tip to the tip fixing portion, a step of polishing a protruding surface of the base metal cutting edge and a side surface of the carbide tip, a rake face and a tip surface of the base metal cutting edge and the carbide tip And a step of polishing the chip saw.

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