JPH0663301U - Tipped saw - Google Patents

Abstract

(57) [Summary] [Purpose] The structure is such that even a thin body can be brazed strongly, and the chip is unlikely to break or fall off. [Structure] A disk-shaped circular saw tooth body 21 having a predetermined thickness
In a tip saw in which tips 24 that form blades are arranged and brazed in recesses 23 formed at appropriate intervals in the outer edge portion, the tip has a width in the thickness direction of the main body rather than the thickness dimension of the main body. The chip is characterized in that it is formed to have a large size, and the projecting edges 26 and 27 to be brazed to the side surface of the main body are formed on one side or both sides of the chip with a thickness within the large range.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tip saw using a hard tip for a blade portion of a circular saw tooth for cutting, woodworking, metal working, and the like, and more particularly to a structure for attaching the tip to a saw tooth body.

[0002]

[Prior art]

 In a conventional tip saw, a tip made of cemented carbide is brazed to a circular saw tooth body. The general tip shape and its mounting structure are shown in FIG. In (a), the back surface 2 and the lower surface 3 of the chip 1 are brazed to the recesses 5 of the main body 4, and (b) is the back surface 2 and the lower surface 3 of the chip 1 and the lower portion 6 of the front surface of the recess 7 of the main body 7. (C) shows that the tip 9 is inclined and the other U-shaped peripheral surface 10 excluding the cutting edge of the tip is brazed to the recess 12 of the main body 11. When the tip is applied to an application where a heavy load is sometimes applied to the cutting edge, the tip may chip, break, or fall off under the heavy load. In the case of (a), the bonding area by brazing is smaller than that of other cases. When a large load is applied to the cutting edge, (b) is more likely to fall off than (a) and (c) is less likely to fall off from (b) in terms of the brazed joint area. Therefore, when these are applied to the circular saw teeth for cutting off, the one of (c) is preferable. If (a) is applied to applications where a relatively large load acts on the cutting edge in woodworking or metalworking, there is a risk of peeling and falling off at the brazed portion. In this case as well, (b), (b) rather than (a) (C) is more difficult to fall off than ().

[0003]

[Problems to be solved by the device]

 Generally, the cutting load is applied intermittently to the blade of the saw blade, so in the case where the blade is formed by brazing the tip like the tip saw, the saw body and the tip are strongly connected. There must be. However, even the most strongly coupled (c) shown in FIG. 6 is not necessarily suitable for applications in which a large load acts. In the case of a tip saw for reaping, the cutting conditions are extremely severe, so even if a small chip of the cutting edge is unavoidable, it is necessary to prevent the tip from breaking or falling off as much as possible because it can easily lead to an accident. In that case, the conventional structure of FIG. 6 (c) is not sufficient. That is, even in the case of FIG. 6 (c), when the circular saw tooth body has a small thickness and the tip has the same width as the thickness of the body, the tip is likely to be broken, and when the width of the tip is larger than the thickness of the body, the tip falls Is likely to occur. In the case of woodworking and ironwork, generally, it does not reach the level of heavy cutting when the cutting ability is good, but if the cutting ability decreases, the cutting resistance increases and the cutting resistance increases. A large load will be applied to the tip, and the tip may break or fall off.

In the case of a tip saw, the thickness of the sawtooth body is basically not so thick, and therefore the tip and the body are not brazed in such a large area even in the case of FIG. 6C. Yes, it is inevitably easy to peel off on the brazed surface. An object of the present invention is to provide a tip saw having a structure that can be strongly brazed even to a thin main body and the tip is unlikely to break or fall off.

[0005]

[Means for Solving the Problems]

 The tip saw of the present invention is a tip saw in which tips for forming blades are arranged and brazed in recesses formed at appropriate intervals on the outer peripheral portion of a disk-shaped circular saw tooth having a predetermined thickness. The chip has a width dimension in the thickness direction larger than the thickness dimension of the main body, and the tip has a protruding edge portion to be attached to the side surface of the main body with a thickness within the large formed range. It is characterized in that it is formed on one side or both sides of.

[0006]

[Action]

 In the state where the tip is placed in the recess formed in the body of the circular saw tooth and brazed, in addition to the conventional brazing area, the body side surface of the protruding edge is brazed to the body The number is increasing, and the extra brazed part makes the main body and the chip bond more strongly than before. Moreover, since the protruding edge on the tip side has a cross-sectional shape that effectively increases the bending resistance of the tip, it acts synergistically with the increase in the brazing area to prevent the tip from breaking or falling off. .

[0007]

【Example】

 A first embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 21 is a circular saw tooth main body, which is formed in a disk shape having a predetermined thickness t, and has saw teeth 22 formed at a predetermined pitch on the outer periphery thereof. A recess 23 is provided on the front end side for placing the chip and brazing it. The recess 23 is the simplest U-shaped cutout, and is provided so as to penetrate the main body 21 in a constant shape in the thickness direction. Reference numeral 24 denotes a tip, which has a bilaterally symmetrical front shape shown in FIG. 2 (a) and is elongated and has a blade tip 25 at one end. As shown in FIGS. 2 (b) and 2 (c), the circular saw tooth body 21 has A width dimension w in the same direction as the thickness t is larger than the thickness of the circular saw tooth body 21 by a dimension e (t + e). The portion 24a having the same width t as the thickness dimension t is formed so as to have a U-shaped contour corresponding to the recess 23 of the main body 21, and the portion having the width dimension e is formed on both sides by the thickness. The protrusions 26, 27 are formed on the flange-like protruding edges 26, 27. The protrusions 26, 27 have a protrusion amount similar to the dimension e, and are provided over substantially the entire length in the longitudinal direction.

As shown in FIGS. 1 and 3, the tip 24 is sequentially fitted into each recess 23 of the circular saw tooth body 21 so that the front surface and the back surface can be seen alternately when viewed from one side surface of the body 21. It is embedded and brazed. In the case of joining by brazing, the surface forming the U-shaped contour of the portion 24a of the tip 24 and the inner surface of the recess 23 of the main body 21 are joined together as in the conventional one. Inner surfaces of the edge portions 26 and 27 are joined to one side surface portion of the main body 21 facing the inner surfaces. Moreover, the cross-sectional shape perpendicular to the longitudinal direction is a shape that increases the bending strength of the tip 24. Therefore, as compared with a conventional general rectangular cross-section, the tip 24 has a shape that is hard to break and is more strongly bonded to the main body 21, so that breakage or falling is less likely to occur.

A second embodiment will be described with reference to FIGS. 4 and 5. Compared with the first embodiment, this embodiment is different in that the tip 34 is additionally provided with projecting edge portions 36 and 37 and the cutting edge 35 is biased to one side, and the other portions are substantially the same, so the equivalent portion Are indicated by the same reference numerals and the description thereof will be omitted. The projecting edge portions 36 and 37 are symmetrically provided on the opposite side of the projecting edge portions 26 and 27 with respect to the main body 21.

In this embodiment, the inner surfaces of the projecting edges 36 and 37 and the side surface of the main body 21 facing the inner surfaces of the protruding edges 36 and 37 are brazed and joined together more strongly than in the first embodiment. In addition, the cross-sectional shape of the tip 34 at right angles to the longitudinal direction is a shape that further increases the bending strength of the tip 34. Therefore, as compared with the first embodiment, the chip 34 has a shape that is less likely to be broken and is more strongly joined to the main body 21, so that the chip 34 is less likely to break or fall off.

In the first and second embodiments described above, the projecting edge portions 26, 27, 36, 37 are not provided at the end portion of the tip opposite to the cutting edge. The projections may be concentrically projected on the arc-shaped contour of the portion. This reduces the reduction in cutting force with the main body when the chip is shortened by use or re-polishing. In the first and second embodiments described above, the tips 24 and 34 are elongated rectangular parallelepiped-shaped and provided with protruding edges. However, the tips and the recesses are tapered so as to become thinner on the side opposite to the cutting edge. It may be formed in. This facilitates insertion of the tip into the recess when brazing. Further, in the second embodiment, the protruding edge portions 26, 27, 36, 37 are shown, but if any one of them is present, the bending strength and the bonding strength are increased, Some may be omitted.

[0012]

EFFECTS OF THE INVENTION According to the present invention, the tip is provided with a protruding edge portion that can be brazed to the side surface of the circular saw tooth body and that can increase the bending force of the tip itself. It is possible to provide a tip saw that does not break or fall off.

[Brief description of drawings]

FIG. 1 is a partial schematic perspective view of a first embodiment of the present invention.

2A and 2B show the shape of the chip of the embodiment, FIG. 2A is a front view, FIG. 2B is a side view, and FIG. 2C is a plan view.

FIG. 3 is a partial plan view of the same embodiment as seen from the cutting edge side.

FIG. 4 is a partial plan view of the second embodiment as seen from the cutting edge side.

5A and 5B show the shape of a chip of a second embodiment, FIG. 5A is a front view, FIG. 5B is a side view, and FIG. 5C is a plan view.

FIG. 6 is a partial side view showing the structure of a tip of a conventional general tip saw and its mounting portion.

[Explanation of symbols]

 21 Circular Sawtooth Body 22 Sawtooth 23 Recess 24 Tip 25 Blade Edge 26 Protruding Edge 27 Protruding Edge t Circular Sawtooth Body Thickness 34 Tip 35 Blade Edge 36 Protruding Edge 37 Protruding Edge

Claims (2)

[Scope of utility model registration request] 1. A tip saw in which tips for forming blades are arranged and brazed in recesses formed at appropriate intervals in the outer peripheral portion of a disk-shaped circular saw tooth having a predetermined thickness,
The tip has a width dimension in the thickness direction larger than the thickness dimension of the main body, and a protruding edge portion to be brazed to a side surface of the main body with a thickness within the largely formed range of the tip is formed. A tip saw that is formed on one side. 2. A tip saw in which tips for forming blades are arranged and brazed in recesses formed at appropriate intervals on the outer peripheral portion of a disk-shaped circular saw tooth having a predetermined thickness,
The chip has a width dimension in the thickness direction larger than the thickness dimension of the main body, and the protruding edges of the chip are brazed to the side surfaces on both sides of the main body within the largely formed range. A tip saw that is formed on both sides.