JPS59187419A - Saw tooth of circular saw machine or the like - Google Patents

Abstract

PURPOSE:To eliminate the friction caused between a chip and cut side surfaces so as to prevent a deflective load from being applied to a tooth, by providing a chip curving groove opened to a flank and forming a cutting edge in the opening end part of said groove in the central part in the tooth width direction of a rake face in each tooth of a saw. CONSTITUTION:A chip B is cut off without being divided by cutting edges 9a in an intersection part between a rake face 10 and a flank 12 and by a cutting edge 9b in the opening end part of a chip curving groove 13. First at this time, right and left parts of the chip B are cut off by the cutting edges 9a then a central part of the chip B is cut off by the cutting edge 9b a little later than said right and left parts. Accordingly, the chip B, never causing the friction with cut side surfaces D of a work to be cut, can be smoothly cut off.

Description

Detailed Description of the Invention (Object of the Invention/Field of Industrial Application) The present invention relates to a saw blade used in a saw machine, particularly a circular saw machine, and is suitable for cutting metal round bars, square bars, shapes, etc. used.

(Prior Art) When cutting a metal bar with a circular saw, the chips generated by cutting can prevent cutting. That is, in FIG. 1, the saw blade 1
Chips B generated by cutting a workpiece A such as a metal material with the teeth 2 are collected in a chip chamber 3 surrounded by the teeth 2 and a bottom C for cutting the metal material. The chips B are compressed by the rake face 4 at the moment they are cut out of the metal material A, and as a result, they extend in the width direction of the chips B (perpendicular to the plane of the paper in Fig. 1) and recut along the side surface between 0 and 4. Wider than the width.

Therefore, severe friction occurs between the chips B and the re-cutting side surface D in the chip chamber 3, causing problems such as an increase in cutting resistance and heat generation.

In order to solve this problem, the chip dividing grooves 6a, 6 are alternately shifted for each adjacent tooth 2.2 on the flank surface 5 of the tooth 2.
Conventionally, a method has been used in which the chips B are divided into leeks in the width direction by the chips divided i6a and 6b. An example of this is the one described in Japanese Unexamined Patent Publication No. 56-27727, but with these conventional ones, the machining to alternately provide the chip dividing grooves 6a and 6b on the teeth 2°2 is troublesome. Since the chip dividing grooves 6a and 6b are not located at the center of the tooth 2 in the width direction, an uneven load is applied to the tooth 2 during cutting, causing vibration, which shortens the life of the tooth 2. there were.

(Object of the Invention) An object of the present invention is to provide a saw blade that eliminates the severe friction between the chips B and the cutting side surface and that does not apply unbalanced loads to the teeth.

(Structure of the Invention) Each tooth of the saw blade has a chip bending groove that opens to the flank surface at the center in the tooth width direction, and the opening end of the chip bending groove to the flank surface. It is characterized in that a cutting edge is formed on the edge.

Embodiment FIGS. 3A, B and C do not show the teeth 7 of a saw blade for a circular saw machine, and the saw blade has teeth 7 of the same shape on its circumference. A tip 8 of a cutter made of sintered cemented carbide or the like is fixed to the tooth 7 so as to protrude slightly from the tooth bottom line 7a. A cutting surface 11, a flank surface 12, and chamfered portions 12a, 12a thereof are formed.A cutting surface 10 and a second cutting surface 11 are provided with a chip bending groove 13 at the center in the face width S direction. The chip bending groove 13 has a shallow U-shaped cross-sectional shape at the groove bottom, and one end is open to the flank surface 12 and the other end is open to the lower end surface 8a of the chip.
The groove bottom of the portion opening to the lower end surface 8a smoothly continues to the tooth bottom line 7a. The open end of the chip bending groove 13 that opens to the flank 12 is continuous with the cutting edge 9 and forms a part thereof, and the workpiece is covered with chips over its tooth width S by the - pieces of chips 8. is scraped off.

In FIG. 4, the chips B are not divided by the cutting edges '3a and 9a at the intersection of the rake face 10 and the flank surface 12 and the cutting edge 9b at the open end of the chip bending groove 13. scraped off. At this time, first, the left and right portions of the chips B are scraped off by the cutting blades 9a, 9a, and a little later, the central portion is scraped off by the cutting blade 9b. Therefore, the left and right parts of the chips B that were scraped off first are bent in the direction of travel of the chips B as shown in FIG. 4, and the central part enters the chip bending groove 13, thereby The width s1 of B becomes smaller than the tooth width S. Therefore, the chips B are smoothly scraped off without causing severe friction with the side surface of the workpiece.

As is clear from the above description, the width and depth of the chip bending groove 13 may be sufficient as long as the chip B is bent so that it is smaller than the width between the cutting side and D. for example,
The width may be 20 to 60% of the tooth width S, and the depth may be 0.2 to several millimeters, and these may be increased or decreased in the longitudinal direction of the chip bending groove 13. In addition, the length of the chip bending groove 13 was formed over the entire length of the chip 8 in this embodiment, but as shown in FIGS. It is also possible to open the opening by In this case, there is no need for the tip 8 to protrude beyond the tooth bottom line 7a.

In this embodiment, the cross-sectional shape of the groove bottom of the chip bending groove 13 is a shallow U-shape, but the shape is not limited to this.
For example, as shown in FIGS. 6A, B, and C, it may be formed into an upward U-shape, an arc shape, or a V-shape, and the chip bends a13a and 13b, respectively.

The width, depth, and length of 13c can be selected as appropriate.

In this embodiment, a structure is adopted in which the tip 8 is fixed to the tooth 7, so that only the tip 8 can be manufactured relatively easily from, for example, sintered metal.
A blade may be formed on the body.

The present invention can also be applied to blades for milling machines.

(Effects of the Invention) According to the present invention, the chip B is bent and its length in the width direction is reduced, so that severe friction with the cutting surface does not occur, and therefore, cutting resistance and susceptibility are reduced. Improved cutting speed and saw blade life can be measured. In addition, the chip bending groove 13.13
Since a, 13b, and 13c are located at the center of the tooth 7 in the width direction, an uneven load is not applied to the tooth 7 during cutting.
The generation of vibration is prevented, which improves cutting accuracy and life.

[Brief explanation of drawings]

Figure 1 is a diagram explaining the appearance of chips cut by a circular saw, Figure 2 is a front view showing an example of a conventional tooth, and Figures 3A and B.
and C show a front view, side view and plan view of a tooth showing one embodiment of the present invention, Fig. 4 is a partially enlarged view of Fig. 3C, and Figs. 5A and B show another embodiment of the present invention. The front and side views of the tooth shown in FIGS. 6A, 6B and 6C are views showing the shape of the chip bending groove of another embodiment of the present invention. A... Work to be cut, B... Chips, 7... Teeth, 9...
- Cutting edge, 10... Rake face, 11... Second cut face (rake face), 12- Relief face, 13.13a, 13b
, 13c=-chip bend groove. Figure 1 Figure 2 Figure 3 (Town Figure 4 Figure 5 (B) (A) Figure 6

Claims (5)

[Claims] (1) Each tooth of a circular saw has a chip bending groove that opens to the flank in the center in the tooth width direction, and the opening end of the chip bending groove to the flank A saw blade for a circular saw machine, etc., characterized by having a cutting edge formed therein. (2) The saw blade according to claim (1), wherein the chip bending groove has a groove bottom having a cross-sectional shape of a shallow U-shape. (3) The saw blade according to claim (1), wherein the chip bending groove has an upwardly U-shaped cross-sectional shape at the groove bottom. (4) The saw blade according to claim (1), wherein the chip bending groove has a groove bottom having an arcuate cross-sectional shape. (5) The saw blade according to claim (1), wherein the chip bending groove has a groove bottom having a V-shaped cross-sectional shape.