JPH0929538A - Tip for cutting and tip saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deformation of a tip by reducing the cutting resistance to a work, and to improve the working efficiency by reducing the cutting time. SOLUTION: A tip 22b for left tooth and a tip 22a for right tooth are provided with flat cutting faces 26a, 26b formed on the upper surface, a tip face adjacent to cutting blades 30a, 30b formed on the tip part of the cutting faces 26a, 26b, and a pair of side faces 34a, 34b which are adjacent to the cutting faces 26a, 26b in the shorter side and opposite to each other, and side parts 38a, 38b, 40a, 40b which are the boundary of the cutting faces 26a, 26b with the side faces 34a, 36b are formed curved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip for cutting and a chip saw in which a large number of chips for cutting are implanted so as to be alternately adjacent to the peripheral edge of a disk-shaped base metal.

[0002]

2. Description of the Related Art In general, a disc tip saw in which a large number of cutting tips (hereinafter also simply referred to as "tips") are alternately implanted at a peripheral portion of a disc-shaped base metal is used. Has been done. The disc tip saw is used for brush cutting, woodworking, etc., and is formed by separately forming a disc-shaped base metal and a large number of chips made of a hard alloy, and joining both by brazing or the like. It

In this case, each tip is in the shape of a rod having a rectangular cross section with a sharp tip. For example, in the case of a mowing disc tip saw used for mowing, the longitudinal direction of the tip is the direction of rotation from the radial direction of the base metal. It is implanted in the peripheral edge of the disk-shaped base metal so as to make an inclination of about 45 ° toward (see angle C in FIG. 1). However, in the case of a disk tip saw for cutting harder materials such as woodworking, the angle C is set to a smaller value, and in an extreme case, it is set to zero or minus.

As shown in FIG. 5A, the tip of the chip 2 (hereinafter referred to as reference numerals 2a and 2b, if necessary) forms an angle of about 30 ° to 50 ° with the upper and lower surfaces of the chip 2, respectively. The front end surface 4 and the rake surface 6 are respectively formed. When the chip 2 is implanted in the base metal 10, both surfaces are substantially orthogonal to the plane of the base metal 10, and the tip surface 4 is the base metal 1
It is located outside 0 and the rake face 6 is located inside it (see FIG. 5B). These two sides intersect at an angle of about 90 °. The ridge line 8 that is the boundary forms the tip of the chip 2 and is located approximately in the center of the thickness of the chip 2.

The tip 2 is usually cast and formed, and there is no distinction between the right tooth tip 2a and the left tooth tip 2b in its shape. That is, the right tooth tip 2a and the left tooth tip 2
Regardless of b, the chips 2 are formed in substantially the same shape. Moreover, the tip is rounded and not sufficiently sharp.

Accordingly, after both side surfaces 12a and 12b of the chip 2 implanted in the peripheral portion of the base metal 10 are ground linearly, the tip surface 4 and the rake surface 6 of the chip 2 are further ground. The cutting edges 9 corresponding to the right tooth tip 2a or the left tooth tip 2b are formed on the ridge line 8 (see FIG. 5C). After grinding, right tooth tip 2
The a and the left tooth tip 2b have different axisymmetric shapes. In addition, in FIG. 5B, the angle A is the end surface 4
The clearance angle B and the angle B indicate the rake angle of the rake face 6, respectively.

[0007]

However, in the tip 2 according to the prior art, both side surfaces 12a and 12b of the tip 2 are formed in a flat shape as shown in FIG. When the cutting is performed, the cutting resistance between the cutting surface with respect to the object to be cut and the both side surfaces 12a and 12b of the tip becomes large, and as a result, the cutting edge of the tip 2 is easily deformed by frictional heat.

Further, since the cutting resistance increases due to the above-mentioned reasons, there is a problem that the cutting time for the object to be cut increases and the working efficiency deteriorates.

The present invention has been made in order to overcome the above-mentioned inconvenience, and reduces the cutting resistance against the object to be cut to prevent the chip from being deformed, and at the same time, shortens the cutting process time to improve work efficiency. It is an object of the present invention to provide a cutting tip and a tip saw capable of improving the cutting performance.

[0010]

In order to achieve the above-mentioned object, the present invention provides a cutting tip, which is implanted in a peripheral portion of a disk-shaped base metal at a predetermined distance from each other. It consists of a left tooth tip and a right tooth tip that are formed line-symmetrically with the base metal as an axis, and the left tooth tip and the right tooth tip are a flat rake face formed on the upper surface and the rake face. A tip surface adjacent to the cutting edge formed on the tip of the
A ridge line portion that is a boundary between the rake face and the side face is formed in a curved shape, including a pair of side faces adjacent to each other in the lateral direction of the rake face and facing each other.

Further, the present invention has a disc-shaped base metal, and a left tooth tip and a right tooth tip which are formed line-symmetrically with the metal base as an axis. The right tooth tip has a flat rake face formed on the upper surface and a tip face adjacent to the cutting edge formed at the tip of the rake face,
A ridge line portion that is a boundary between the rake face and the side face is formed in a curved shape, including a pair of side faces adjacent to each other in the lateral direction of the rake face and facing each other.

The cutting tip according to the present invention is prepared by casting a hard metal into a predetermined shape for each of the left and right teeth. The thus prepared left and right teeth cutting chips are successively implanted and brazed on the peripheral edge of the disk-shaped base metal so that they appear alternately.

Since the cutting tip in this state is as-cast, it has rounded corners and is not sharp. Therefore, a sharp cutting edge is provided by adding a grinding process to this.

In the grinding step, a disk-shaped base metal having cutting chips implanted in the peripheral portion as described above is set in a grinding machine, and while feeding one tooth at a time, both side surfaces of the cutting chips are set. After each of them is curvedly ground, the rake face and the tip face of the cutting tip are ground to form a sharp cutting edge, thereby completing the tip saw.

The cutting tip after grinding is composed of a left tooth tip and a right tooth tip. The left tooth tip and the right tooth tip have a flat rake face formed on the upper surface,
It includes a tip surface adjacent to a cutting edge formed at the tip of the rake surface, and a pair of side surfaces adjacent to each other in the lateral direction of the rake surface and facing each other. In this case, the ridge line portion which is the boundary between the rake face and the side face is formed in a curved shape.

When cutting the object to be cut using a large number of tip saws that are embedded in the periphery of the base metal at predetermined intervals, the cutting surface of the object to be cut and the cutting Since a gap is provided between the chip and the side surface, the cutting resistance with respect to the cutting surface is reduced and the generation of frictional heat is suppressed.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Next, preferred embodiments of a cutting tip and a tip saw according to the present invention will be given and described in detail below with reference to the accompanying drawings.

FIG. 1 shows a tip saw 24 in which a large number of cutting tips 22 (hereinafter, also simply referred to as tips 22) according to an embodiment of the present invention are implanted in a peripheral portion of a disk-shaped base metal 20. It is a side view shown. In this case, the angle C is + about 4
It is taken at 0 °. Further, the traveling direction of the chip 22 with the rotation of the base metal 20 is the direction of arrow D in the figure.

FIG. 2 is a partially enlarged perspective view showing the chip 22 implanted in the base metal 20. The tip 22 is composed of a right tooth tip 22a and a left tooth tip 22b, which are alternately implanted at a peripheral portion of the base metal 20 with a predetermined distance therebetween.

Since the right tooth tip 22a and the left tooth tip 22b have the same configuration, the following description will be made based on the right tooth tip 22a, and the left tooth tip 22b has a corresponding configuration. The same reference numerals as those of the elements are given the reference numeral b, and the detailed description thereof is omitted.

The right tooth tip 22a has a flat rake face 26a formed on its upper surface (see FIG. 4A). A tip surface 28a is formed adjacent to the rake surface 26a, and a sharp cutting edge 30a is formed at a ridge line portion of a boundary between the rake surface 26a and the tip surface 28a (see FIG. 4C). The cutting edge 30a is formed to be inclined to the right along the flat rake face 26a by a predetermined angle, and the left end of the cutting edge 30a is the cutting edge tip 32a (see FIG. 4B).

Both side surfaces 34a, 36a of the right tooth tip 22a facing each other are formed in a curved shape from the rake surface 26a which is the upper surface toward the bottom surface on the lower side (see FIG. 4A), and the rake surface 26a. And both side surfaces 34a, 36
The ridges 38a and 40a at the boundary with a are formed so as to be gradually widened from the portion joined to the base metal 20 toward the outer radial direction of the base metal 20 (FIGS. 4A and 4A and FIG. 4A). 4B). In this way, the ridge line portions 38a, 40a of the both side surfaces 34a, 36a of the right tooth tip 22a are formed in a curved shape, so that the cutting resistance against the cutting surface of the object to be cut can be reduced.

The cutting tip 22 (22a, 22b) according to the embodiment of the present invention and the tip 22 (22)
The tip saw 24 incorporating a, 22b) is basically constructed as described above. Next, its function and effect will be described.

First, the chips 22 before grinding are bonded to the peripheral edge of the disk-shaped base metal 20 at a predetermined interval.

Next, the grinding process of the many chips 22 bonded to the peripheral edge of the base metal 20 will be described.

The chip 2 is formed by a side polishing device (not shown).
The two side surfaces 34a, 36a of the second member 2 are curved and formed in a substantially arc shape. After polishing both side surfaces 34a, 36a of all the chips 22 bonded to the peripheral edge of the base metal 20, the rake surfaces 26a, 26 of the chips 22 are polished by a tip surface polishing device (not shown).
b and the tip surfaces 28a, 28b are respectively ground, and the cutting edges 30a, 30b are formed by imparting sharpness to the ridge line which is the boundary between the rake surfaces 26a, 26b and the tip surfaces 28a, 28b. Complete.

When the object to be cut is subjected to the cutting operation under the rotating action of the tip saw 24, both side surfaces 34 of the tip 22 are processed.
a, 34b, 36a, 36b ridge line portions 38a, 38b,
Since 40a and 40b are formed in a curved shape and have a gap between them and the cutting surface of the object to be cut, the cutting resistance against the cutting edges 30a and 30b is reduced, and the cutting edges 30a and 3b due to frictional heat.
It is possible to prevent 0b from being deformed.

Further, since the cutting resistance is reduced, the cutting time for the object to be cut can be shortened and the working efficiency can be improved.

[0029]

The cutting tip and the tip saw according to the present invention have the following effects and advantages.

That is, since the side surface of the cutting tip is formed in a curved shape and the cutting resistance against the cutting edge is reduced as compared with the conventional case, the deformation of the tip is prevented and the cutting time is shortened. Work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a side view of a tip saw having a large number of cutting tips implanted therein according to an embodiment of the present invention.

FIG. 2 is a partially enlarged perspective view of the cutting tip according to the embodiment of the present invention.

3 is a view of the cutting tip shown in FIG. 3 as seen in the direction of arrow Y in FIG.

FIG. 4 is an explanatory view of the cutting tip shown in FIG.
4A is a front view of the cutting tip, FIG. 4B is a plan view of the cutting tip, and FIG. 4C is a right side view of the cutting tip.

5A and 5B are explanatory views of a tip according to a conventional example used for a tip saw, FIG. 5A is a perspective view of the tip before grinding, and FIG. 5B is a state in which the tip shown in FIG. 5A is joined to a peripheral portion of a base metal. 5C is a side view of the chip after grinding viewed from the direction of arrow X in FIG. 5B.

[Explanation of symbols]

20 ... Base metal 22 ... Cutting tip 22a ... Right tooth tip 22b ... Left tooth tip 24 ... Tip saw 26a, 26b ...
Rake surface 28a, 28b ... Tip surface 30a, 30b ...
Cutting blades 32a, 32b ... Cutting blade tip portions 34a, 34b,
36a, 36b ... Side surface 38a, 38b, 40a, 40b ... Ridge portion

Claims (4)

[Claims] 1. A cutting tip to be implanted in large numbers on a peripheral edge of a disk-shaped base metal at a predetermined interval, wherein a left tooth tip and a right tooth tip are formed line-symmetrically with the base metal as an axis. It consists of a tooth tip, the left tooth tip and the right tooth tip, a flat rake face formed on the upper surface, and a tip surface adjacent to the cutting edge ridge formed at the tip of the rake surface, For cutting, characterized in that each of the rake faces includes a pair of side faces adjacent to each other in the lateral direction and facing each other, and a ridge line portion that is a boundary between the rake face and the side faces is formed in a curved shape. Chips. 2. The cutting tip according to claim 1, wherein a side end portion of the rake face has a curved shape gradually widening from a portion joined to the base metal toward a radial outer direction of the base metal. A cutting tip characterized by being formed into a. 3. A left tooth tip and a right tooth tip, which have a disc-shaped base metal, and a left tooth tip and a right tooth tip which are formed line-symmetrically with the base metal as an axis. Is a flat rake face formed on the upper surface, a tip face adjacent to the cutting edge formed on the tip of the rake face, and a pair of pairs adjacent to each other in the lateral direction of the rake face and facing each other. A tip saw, characterized in that each of the side faces includes a ridge line portion which is a boundary between the rake face and the side face and is curved. 4. The tip saw according to claim 3, wherein the side edges of the rake face formed on each of the left tooth tip and the right tooth tip are radially outward of the base metal from a portion bonded to the base metal. A saw having a curved shape that gradually widens toward the edge.