JPH06716A - Band saw blade - Google Patents

Abstract

PURPOSE:To cool chips produced from the cutting point of an addendum and to guide the chips to an inner chip guiding surface by a method wherein a straight-line part having a length of 2.0mm or less from the addendum is formed on the face side of the acute angular addendum of each saw tooth. CONSTITUTION:Chips produced at the cutting point of an addendum 13 flow along a first straight-line part 15. Since the chips are apt to curl owing to generated heat but the chips are difficult to curl when the straight-line part 15 is too long, the straight-line part 15 is set to a value lower than 2.0mm. The chips are guided to a chip induction surface 17 forming a guide for curling. The chip induction surface 17 connected to the straight-line part 15 is formed in a recessed arcuate shape with a radius of 0.5-3.0mm and the inner end of the chip induction surface is protruded frontward in a cutting direction from the addendum 13 by a distance of 1/2 or less of the radius. The chips fed from the straight-line part 15 are guided in a manner to arcurately roll them in not by material quality but by a recessed arcuate surface to effectively generate a curl. This constitution causes effective production of chips most of which are curled during processing of chips.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band saw blade for cutting metal.

[0002]

2. Description of the Related Art Conventionally, in band saws for metal cutting, as shown in FIGS. 10 (a) to 10 (d), there are known saw blades having saw teeth having various rake faces. No saw blade has a guide surface on the saw teeth. As a saw blade of a circular saw, there is known a saw blade having a chip guide surface on a saw tooth, as described in JP-A-52-133193.

[0003]

However, the conventional band saw blade has the following problems because the chip guiding surface is not formed on the rake surface. That is, when a material having high ductility, such as stainless steel, is cut, the chips are long spiral-shaped chips a and long straight chips b as shown in FIG. 7, and the chips a are chips of the band saw machine. There is a problem in that it cannot be discharged because it is entangled with the conveyor, and the chips b enter between the insert of the saw blade and the body and cause bending. Further, when brittle materials such as die steel and bearing steel are cut, the chips are short and fine as shown in FIG. 8.
As shown in FIG. 9, the chips 1 produced during cutting are located in the closed gullet 5 of the sawteeth 3, which again penetrate into the cutting point 7 during the cutting and are cut, and by repeating this, the chips are separated. It becomes a fine powder as shown in 8. Further, in such cutting, there is a problem that the cutting resistance is increased due to the addition of re-cutting of chips to the cutting of the material, the sharpness becomes dull, and the bending occurs, and the like.

Even if a chip guide surface as disclosed in Japanese Patent Application Laid-Open No. 52-133193 can be provided on each saw tooth of the band saw blade, the shape of the chip guide surface is close to that of each saw tooth. However, it is not clear what shape the chip guide surface should be formed on each saw tooth of the band saw blade, because there is a relationship, and the sharpness greatly differs depending on the shape.

The present invention has been made in view of the above conventional problems, and limits the shape of the chip guiding surface formed on the rake face of each saw tooth to a special size, so that the material can be cut during material cutting. Most of the generated chips are curled like a mainspring, which makes it easier to discharge from the sawtooth gullet, makes it difficult for chips to get entangled in the chip conveyor of the band saw machine, and reduces the number of maintenance operations, and also provides a sharp cutting edge. An object is to provide a band saw blade that can be maintained.

[0006]

According to a first aspect of the present invention, there is provided a band saw blade comprising: 1.
A straight portion having a length of 0 mm or less and a concave arc shape with a radius of 0.5 to 3.0 mm so as to be in contact with the inner end of the straight portion, and the inner end of the radius is forward from the tooth tip in the cutting direction. And a chip guide surface protruding by ½ or less of the above, and the inside end of the chip guide surface is connected to the rake face.

Further, in the band saw blade according to the invention of claim 2, in the band saw blade having a height difference in tooth height, within 2.0 mm from the tip of the tooth on the rake face side of the tip of the saw tooth for each saw tooth. A straight portion having a length and a concave arc shape with a radius of 0.5 to 3.0 mm so as to be in contact with the inner end of the straight portion, and the inner end thereof is 1 / (1) of the radius forward from the tooth tip in the cutting direction. A chip guiding surface protruding by 2 or less is formed, and an inner end of the chip guiding surface is connected to the rake surface.

In the band saw blade of these inventions, the straight portion and the chip guiding surface can be formed in a plurality of steps on the rake face of each saw tooth.

[0009]

In the band saw blade according to the first aspect of the invention, the chips generated from the cutting points of the tooth tips flow along the first straight line portion. The chips are easily curled by the generated heat, but if the straight part is too long, the chips are less likely to curl. Therefore, the straight part is set to 2.0 mm or less and is guided to the chip guide surface that serves as a guide for curling. The chip guiding surface connected to this straight line part is
Chips sent from a straight part in the shape of a concave arc having a radius of 0.5 to 3.0 mm, the inner end of which protrudes forward from the tooth tip in the cutting direction by ½ or less of the radius. The curls are effectively curled by wrapping them in a circular arc shape regardless of the material. In this way, a large number of curled chips are effectively generated during cutting.

According to the band saw blade of the second aspect of the present invention, similarly to the band saw blade of the first aspect, by forming a chip guide surface having a shape corresponding to the tooth height on each rake face with each saw tooth having a height difference. Effectively produces curled chips even when cutting difficult-to-cut materials.

Further, in the band saw blade according to the first or second aspect of the invention, the curled chips can be generated more effectively by connecting the straight portion and the chip guiding surface in a plurality of stages.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 2 shows the overall shape of an embodiment of the invention of claim 1 in which a large number of saw teeth 9 are formed on one side of the body of the band saw blade 7. And, each of the saw teeth 9 is shown in FIG.
As shown in detail in, on the rake face 11 side of the acute-angled tip,
A straight portion 15 having a length A within 2.0 mm from the tooth tip 13,
The radius B is 0.5 so as to contact the inner end of the straight line portion 15.
~ 3.0mm concave arc shape, and its inner end is tooth tip 13
A chip guide surface 17 is formed so as to project forward in the cutting direction by a dimension C that is ½ or less of the radius B, and the inside end of the chip guide surface is continuous with the rake face 11. The shape of the rake face 11 is shown in FIG.
It may have any shape of (a) to (d), or may have another shape, and is not particularly limited.

Here, the reason why the dimensions A, B, C of each part are limited will be explained. The chips generated from the tooth tip 13 which is the cutting point are along the first straight part 15 and the rake face 1 is formed.
It flows deep inside 1. The chips are apt to curl due to the heat generated, but if the dimension A of the straight portion 15 is long, the chips are cooled and are hard to curl.
≧ 2.0 mm.

The chip guiding surface 17 connected to the straight line portion 15 has a concave arc shape for curling the chips, and the radius B is 0.5 mm≤B≤3.0 mm. If <0.5 mm, C <0.25 mm, and the chips pass through here without being forced by the chip guiding surface 17, and are curled by the curved surface of the rake face 11 that follows, and have an appropriate size. This is because you cannot curl. If B> 3.0 mm, the straight part 15
This is because the chips do not curl effectively for the same reason as when the length A is long.

The inside end of the chip guide surface 17 is located forward of the tooth tip 13 in the cutting direction and has a dimension C that is 1/2 or less of the radius B.
It is this dimension C> 1 / that makes (C ≦ B / 2) protrude.
In the case of 2B, the chips curl roundly and are settled in the chip guiding surface 17, and do not flow further inside the rake face 11, resulting in a smaller effective gullet, which results in an increase in the size of large diameter material or heavy cutting. This is a cause of clogging.

As described above, in the embodiment of the invention of claim 1, a large number of curled chips can be generated by the chip guiding surface of a specific size formed on the rake face of each saw tooth, and the chips can be easily discharged from the saw tooth. , Avoiding clogging, reducing the cutting resistance, extending the life of the saw blade, and maintaining a sharp cutting edge for a long time.

At the current cutting site, C is used for general cutting materials such as carbon steel, tool steel, and stainless steel.
≦ B / 3 is sufficient.

Next, as a concrete example, a stainless steel SUS3 is prepared by using a band saw blade having saw teeth 9 having dimensions as shown in FIG.
04φ250, saw speed 30m / min, cutting rate 20cm
Cutting at ² / min produced various chips as shown in FIG. Further, when the same cutting material was cut at the same speed and cutting rate with a conventional band saw in which no chip guiding surface was formed on the rake face, various chips as shown in FIG. 7 were produced.

By comparing the shape of the chips shown in FIG. 4 with the shape of the conventional chips shown in FIG. 7, the shape of the chips produced by the saw blade according to the embodiment of the present invention is effectively curled in the majority. You can see that

Next, an embodiment of the invention of claim 2 will be described.

FIG. 5 shows the overall construction of the embodiment of the invention of claim 2, wherein the band saw blade 21 has a saw tooth group of a plurality of saw teeth 23, 27R, 29L having a high tooth height and a low tooth height. A saw tooth group of a plurality of saw teeth 25L and 31R is provided. The tooth height of the saw blade may be set to three types of high, medium, and low, or more types.

Explaining the set-out of the saw tooth, the saw-tooth 23 is a straight tooth that does not perform right-and-left set-out, the saw-tooth 27R and 31R are right set-out teeth that are right-out set, and the saw-tooth 25L and 29L are left set-out. This is the left set tooth that was made. Further, among the right set teeth, the saw tooth 27R having a high tooth height has a smaller set-out amount than the saw tooth 31R having a low set height, and among the left set teeth, the saw tooth 29L having a high tooth height outputs the set tooth more than the saw tooth 25L having a lower tooth height. The quantity is getting smaller.

Therefore, when the material W to be cut is cut by the saw blade 21 having such a tooth height difference, a large cutting amount is realized by the saw teeth 23, 27R, 29L having high tooth height, and The saw blades 25L and 31R having a low height are used to cut with the widths of the set-out widths M and N which are outside the saw teeth having a high tooth height. In this way, the saw tooth with a high tooth height can realize a sharp sharpness that is not affected by work hardening by cutting a deeper part than a work hardened layer even if a work hardened layer is generated due to the large cutting amount, The saw tooth with a low tooth height can suppress the bending at the time of cutting due to its large set-out amount, and can sharply cut with good linearity.

Also in such a band saw blade having a height difference in the saw teeth, each of the saw teeth 23 to 31L is similar to the embodiment of the invention of claim 1 shown in FIG. The length A within 2.0 mm from the addendum 13
Of the straight line portion 15 and a concave arc shape having a radius B of 0.5 to 3.0 mm so as to contact the inner end of the straight line portion 15, and the inner end thereof has a radius B of 1 from the tooth tip 13 forward in the cutting direction. It is possible to form a chip guiding surface 17 that protrudes by a dimension C of ½ or less, and to make the inside end of this chip guiding surface continuous with the rake surface 11. In this case, the dimensions of the straight portion and the chip guiding surface of the high tooth and the low tooth can be made different within the limits, and the dimensions can be set to suit each.

Further, as an embodiment of the invention of claim 3, the band saw blade 7 of the embodiment of the invention of claim 1 shown in FIG. 2 and the band saw blade 21 of the embodiment of the invention of claim 2 shown in FIG. Saw teeth 9, 23, 27R, 29L, 25L, 31R (only saw teeth 9 are shown in the figure, but high teeth 23, 27R, 29
The same applies to the L and the low teeth 25L and 31R). As shown in FIG. 6, the linear portion 15 and the chip guiding surface 17 shown in FIG. 1 are formed on the rake face 11 so as to be continuous in two steps. As a result, curled chips can be generated more effectively. It is also possible to form this in three or more steps.

[0027]

As described above, according to the invention of claim 1,
The chips generated from the cutting point of the tooth tip will flow deep inside the rake face along the first straight part, but since this straight part is within 2.0 mm, the heat of the chips is cooled here. As a guide for curling, the chips can be guided further to the inner chip guiding surface without fear of becoming linear. Then, the chip guiding surface connected to the straight line portion has a concave arc shape with a radius of 0.5 to 3.0 mm, and the inner end thereof is ½ of the radius forward from the tooth tip in the cutting direction.
Since it projects only below, the chips sent from the straight part can be effectively curled in a spiral shape by guiding it so that it is rolled in an arc shape with a concave arc surface regardless of the material. . Therefore, when cutting the material to be cut, it is possible to effectively generate curled chips, and it is less likely to get entangled in the chip conveyor due to the generation of a large number of string-shaped chips, which reduces the maintenance frequency of the band saw machine. Further, even when cutting a brittle material, there is no fear that the saw teeth are clogged due to the generation of fine chips, and the life of the saw blade can be extended.

Further, in the band saw blade of the second aspect of the present invention, similarly to the band saw blade of the first aspect, the straight line portion and the chip guiding surface having a shape corresponding to the tooth height of each saw tooth having a height difference are formed on the rake face. By forming it, curled chips can be effectively generated even when cutting difficult-to-cut materials.

Further, in the band saw blade according to the first or second aspect of the invention, the curled chips can be generated more effectively by connecting the straight portion and the chip guiding surface in a plurality of stages.

[Brief description of drawings]

FIG. 1 is a front view of a saw tooth portion according to an embodiment of the invention of claim 1. FIG.

FIG. 2 is a front view showing the overall configuration of the above embodiment.

FIG. 3 is a front view of a sawtooth portion of a specific example of the band saw blade according to the invention of claim 1.

FIG. 4 is an explanatory diagram showing chips generated as a result of cutting in the above specific example.

FIG. 5 is a front view, a side view, and a bottom view showing the overall configuration of an embodiment of the invention of claim 2;

FIG. 6 is a front view showing a sawtooth portion of an embodiment of the invention of claim 3;

FIG. 7 is an explanatory view showing chips generated as a result of cutting stainless steel according to a conventional example.

FIG. 8 is an explanatory diagram showing chips generated as a result of cutting a brittle material according to a conventional example.

FIG. 9 is an explanatory view showing a cutting operation of a conventional example.

FIG. 10 is a front view showing various shapes of conventional saw teeth.

[Explanation of symbols]

 7 Band saw blade 9 Saw tooth 11 Rake face 13 Tooth tip 15 Straight part 17 Chip guide surface

Claims (3)

[Claims] 1. A straight line portion having a length of 2.0 mm or less from the tooth tip on the rake face side of an acute-angled tooth tip of each saw tooth, and a radius of 0.5 to 3 so as to contact an inner end of the straight line portion. The chip guide surface has a concave arc shape of 0.0 mm, and its inner end projects forward from the tooth tip in the cutting direction by ½ or less of the radius, and the inner end of the chip guide surface is the rake face. Band saw blade made by connecting to. 2. A band saw blade having a tooth height difference,
For each saw tooth, a straight portion having a length within 2.0 mm from the tooth tip and a radius of 0.5-3. A chip guiding surface having a concave arc shape of 0 mm, the inner end of which projects forward from the tooth tip in the cutting direction by ½ or less of the radius, is formed, and the inner end of the chip guiding surface serves as the rake face. Band saw blade made by connecting. 3. The rake face of each saw tooth is formed by connecting the linear portion and the chip guiding face in a plurality of stages.
Band saw blade described in.