JPH0430908A - Saw tooth - Google Patents

Abstract

PURPOSE:To lengthen the effective cutting length for improving cutting ability and make a saw display high performance without forcing with teeth diagonally formed by continuously and zigzag forming an effective cutting section diagonal to the longitudinal direction of a steel band on the top of the thick wall section of the steel band, whose cross section is like a plectrum. CONSTITUTION:A band-like body A with teeth whose trianglepyramid-like cutting sections 4 and 4a, whose side faces are like saw-teeth, are continuously and alternately formed from both sides of a steel band on the thick-wall section 3 of the steel band whose cross section is like a plectrum, and having teeth, whose effective cutting sections 5 and 5a are formed continuously and zigzag and diagonal to the longitudinal direction of the steel band, on the top of the thick-wall section is obtained. In the body A with teeth, the corners 6 and 6a comprising the effective cutting sections 5 and 5a crossed each other become the shapes of the base section 2 comprising both the side projected, and both corner 6 and 6a of each effective cutting sections 5 and 5a perform setting working. The included angle and cutting angle are freely adjustable by varying the angle and included angle of the blade of a cutter when the cutter is brought into contact with a steel band, and cutting angle can be varied to both acute angles and obtuse angles.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sawtooth, and more specifically, a sawtooth having a substantially dovetail cross section in which one side has an inverted trapezoidal cross section and expands outward to become thick. The present invention relates to a sawtooth in which tooth crests oblique to the longitudinal direction of the steel strip are substantially continuously formed in a zigzag shape or a cross shape on the thick inner upper surface of the steel strip.

[Prior Art and Problems to be Solved by the Invention] Conventional metal saws are made by forming saw teeth on one side of a steel strip by punching or cutting, and by bending the saw teeth to the left and right according to the required number. It is manufactured by creating set teeth and then applying heat treatment. As a cutting tool, it is relatively easy to manufacture, and because the teeth are spaced from each other, it easily bites into the mating material, and the space between the teeth can carry away chips, making it convenient. It has certain advantages. However, despite these advantages, there are the following problems.

B) Regarding clams It is no exaggeration to say that the performance of sawtooth depends on the action of the clams. This is exactly the same for wood saws and metal saws.

Since ancient times, it can be said that what workers using saws have struggled with and put the most effort into is figuring out how to utilize these clams. Conventionally, in woodworking saws, the first
As shown in Figures 4 and 15, in a process called "clam removal", the tip of each sawtooth a is slightly bent alternately left and right (
Shake) It is designed to exert a clam effect. However, one tooth (e.g. al) is originally a corner on both sides (a,' and a,') or a corner that has the ability to set, that is, one saw tooth originally has two corners that have the ability to set. On the other hand, since each - tooth is bent alternately on the left and right, the tooth al of the two teeth (a+ and a2) has its corner a+' + the tooth with a2 has only its corner a2 set. demonstrate. Therefore, originally there would be two teeth (al and a).
2) four corners (, al ・ al ・ a2′ and a
2″) Although it has a strong setting ability, in reality only one tooth (al or a2′) exerts the setting effect on one side.In this way, both corners of the tooth, which are the most important, are There is a problem that the setting action is not sufficiently durable because it is not fully utilized and the corners of the tooth tips are easily worn or broken.

In addition, the method of pulling out clams using a conventional general band saw is as shown in Figures 16 and 17, and this may be because it is easy to pull out clams. 4 teeth (b+, t)2+ b,
, b4) are bent in the same direction. That is, tooth b1. b5°b9... or on the left side in the direction of movement indicated by the arrow, teeth b3b7. ... will be used as the clam on the right side in the direction of travel, in this case four teeth (b, .

b2. b3. b4) 8 corners (b+ b+, b2 ′ ・ b2 ・ b3 ・ b3b
4', b4'), one corner (b1' or b3)
This means that he is playing the role of Takeka Asari. Therefore, the wear on this clam part is the greatest and will decide the life of the saw blade.

That is, there is a problem in that the teeth that have been set are worn out faster, resulting in a reduction in the performance of the saw.

Mouth) Inter-tooth spacing As shown in FIGS. 14 and 16, the sawtooth has a spacing (space) between the teeth. It is because of this spacing that it acts as a saw, and because of this, materials that are thinner or narrower than the spacing between the teeth can get into that gap, causing defects that can cause the teeth to break. In such a case, a saw with a very fine pitch would be required, or such a saw would be labor intensive to manufacture and would have poor durability.

Furthermore, each time the saw teeth bite into the material to be cut, an impact force is applied. For this reason, if the material to be cut is hard, the top of the tooth is likely to break, and cutting will soon become impossible.

Furthermore, the spacing between the teeth is related to cutting noise and vibration, and also causes the sharpness of the teeth to deteriorate quickly.

This is thought to be because the cutting line (tooth crest) of the tooth is perpendicular to the direction of movement of the saw, so the cutting action always acts intermittently, increasing the impact.

Therefore, an object of the present invention is to eliminate the above-mentioned unreasonableness and provide a high-performance saw that utilizes both corners of the crest of each tooth as a set.

A further object of the present invention is to provide a saw tooth in which a continuous cutting line is formed on the top of the tooth of the saw, substantially eliminating the spacing between the teeth unlike in a conventional saw when viewed from the side, and improving cutting performance and durability. It is about providing.

[Means for Solving the Problems] According to the present invention, in order to achieve the above-mentioned object, a substantially dome-shaped cross-section is formed in which one side of the cross-section is expanded outwardly into an inverted trapezoidal shape and becomes thicker. A sawtooth is provided on the upper surface of the thick portion of the steel strip, characterized in that tooth crests that are oblique with respect to the longitudinal direction of the steel strip are formed substantially continuously in a zigzag or intersecting shape.

〔Example〕

Hereinafter, the present invention will be described in more detail while describing some embodiments of the saw teeth of the present invention shown in the accompanying drawings.

First, a steel strip 1 shown in FIG. 3 is prepared which has a generally dovetail-shaped cross-section and one side of which is enlarged outward to have an inverted trapezoidal cross-section and is thickened. The width of the upper surface of the thick portion 3 (the portion that becomes the top of the tooth) is made to be approximately the same as the width of the tip of a tooth that has been set in a conventional saw tooth.

Next, cutting is performed using a high-speed rotating cutter 7 having the shape shown in FIGS. 6 and 7 so that the cut portion 4 having the shape shown in FIGS. 3 to 5 is formed, and the pitch of the teeth is Start cutting by shifting the parts.

Using a similar cutter from the opposite side, cutting is performed so that the cutting portion 4a, which is symmetrical to the cutting portion 4, is shifted by exactly half a pitch.

Through this cutting process, as shown in FIGS. 1 and 2, the thick portion 3 of the steel strip having a substantially dovetail cross section is formed into a substantially triangular pyramid shape with serrated side surfaces alternately and continuously from both sides thereof. Cutting part 4, 4
It is possible to obtain a band-shaped toothed body A having teeth in which tooth crests 5, 5a are formed in a continuous zigzag shape on the upper surface of the thick part and are oblique with respect to the longitudinal direction of the steel strip. . Therefore, the obtained toothed body A has a shape in which the corners 6, 6a where the tooth crests 5.5a intersect protrude on both sides of the base 2, and both corners 6, 6a of the tooth crests 5, 5a of each tooth are flat. It will take effect. The tip angle α and the cutting angle β can be arbitrarily adjusted by changing the angle at which the cutter 7 is applied to the steel strip 1 and the cutting edge angle γ of the cutter blade 8, and the cutting angle β is shown in FIG. It can also be made into an acute angle, such as 90°.
Alternatively, it is also possible to make it obtuse.

8 to 11 show another embodiment of the present invention, in which the upper surface of the thick portion 3 of the steel strip 1 having a substantially dovetail cross section as shown in FIG. The blade 9 is applied obliquely to the longitudinal direction of the steel strip at a predetermined angle δ, and the steel strip is sequentially cut and raised at a predetermined interval corresponding to the above-mentioned angle and at a desired cut-and-raise angle. For example, if the angle is δ or 60°, it is preferable to cut and raise at intervals of about 2L15. As a result, as shown in FIG. 9, an oblique tooth 10a having sharp tooth crests 11a, ilb, - at a predetermined angle δ with respect to the longitudinal direction of the steel strip 1 is formed.

10b, . . . are formed in large numbers in parallel at predetermined intervals.

Next, a cut is similarly made at a predetermined interval between each of the tooth tops formed in this way at a symmetrical angle, that is, an angle that is a supplementary angle to the angle δ.

In this case, one corner of the cut and raised tooth top is the opposing already cut and raised tooth top 11a, 11b, =
Make sure that one corner a2, b2 * '' of ``'' remains on.

Through such cutting and raising work, Figures 10 and 11
As shown in the figure, the thick portion 3 of the steel strip 1 has a generally dome-shaped cross section.
, tooth crests 11a, ll oblique with respect to the longitudinal direction of the steel strip.
b, 11C,-=13a, 13b, 13c, ---
teeth 10a that are substantially continuous and formed in a zigzag shape;
Toothed body B having 10b..., 12a, 12b,...
is obtained. Therefore, the obtained toothed body B has each tooth crest 1
1a, llb, -=, 13a, 13b, ... have a shape that protrudes from both corners of the base 2, and each tooth 10a, 1
0b, -, 12a, 12b tooth top 11a, llb, -
=, 13a, 13b, exerts a clam action on both sides of -,
Each tooth crest is substantially continuous.

The angle of the tooth crest with respect to the longitudinal direction of the steel strip can be arbitrarily adjusted. In addition to the above-mentioned zigzag shape, one diagonal tooth crest and the other diagonal tooth crest can be formed to intersect with each other. An example thereof is schematically shown in FIGS. 12 and 13. In the case of the toothed body C shown in FIGS. 12 and 13, each tooth 14a, 14b, 14c, -16a,
16b, 16c, - tooth top portion 15a.

15b, 1.5c, -=, 17a, 17b, 17c...
are formed in an intersecting lattice shape, but in this case, each tooth crest is substantially continuous, and each tooth crest has a shape that protrudes from both corners or both sides of the base 2 to exert a setting action. Demonstrate.

The toothed bodies A, B, or C obtained by the above processing are heat-treated so that the base portion 2 where no teeth are formed has a highly elastic (sticky) hardness and the tooth top portion has as high a hardness as possible. . Its hardness is around HV500 at the base and H at the teeth.
Around V900 is appropriate. When particularly hardness is required, the tips of the teeth can be hardened using a special hardening method that uses electrical discharge, etc., and this results in metal saws with high wear resistance that have never been seen before. Saw etc.)
can be obtained.

For example, the hardened toothed body ASB or C is used as a cathode, and a wear-resistant metal rod, such as a cemented carbide such as tungsten carbide, is used as an anode, and the wear-resistant metal rod is subjected to vibration. The toothed body is intermittently brought into contact with the tooth tip of the toothed body, and electricity is applied while moving the toothed body in its longitudinal direction to cause a discharge action between the two poles, and the discharge action causes the tooth tip of the toothed body to At the same time, the tip of the wear-resistant metal rod instantly melts due to the electric discharge, and the fine particles form the cathode. It flows toward the tooth tip surface of the tooth body and is fused to the hot tooth tip, creating an extremely strong structure. In this way, at the same time as high-temperature re-hardening of the tooth top portion of the toothed body, a coating of a desired wear-resistant metal melt can be welded to the surface in an alloyed state.

The thickness of the coating is approximately 0.01 to 0.06 mm, and because it is bonded to the tip of the tooth, which is heated to a high temperature by electric discharge, in a diffusion-fused state, the coating will not separate.
A continuous toothed body having a tooth tip portion coated with a tungsten carbide film can be produced in a very rational manner. In addition, although the tooth tip has already been hardened before the above treatment, the hardness of the tooth tip is further increased by the above treatment, and the surface hardness of the tooth tip of the toothed body thus obtained is HV 1500 to 1700. Even under the tungsten carbide coating, a hardness of around HV1300 can be obtained.

[Operation and effect of the invention]

As described above, the sawtooth of the present invention has a substantially continuous zig-sag on the top surface of the thick part of the steel strip having an inverted trapezoidal cross-section and a tooth crest oblique to the longitudinal direction of the steel strip. When cutting with a saw having such serrations, the crests on the same plane produce a continuous cutting action, and the crests protruding on both sides of the base produce a continuous cutting action. Both horns exert a clam effect. Therefore, the following excellent effects and advantages can be obtained.

a) Unlike conventional saw teeth, the tooth crests that perform the cutting action are continuous, and the sum of the lengths of the tooth crests that perform the cutting action is significantly longer, so the cutting ability is high.

b) Since the teeth always act on the workpiece in an oblique state, they always work smoothly without straining the teeth, and since the tops of the teeth are continuous, the cutting efficiency is very high.

C) - Since no impact force is applied to each tooth, there is less risk of tooth tip breakage and excellent durability.

d) Can cut the workpiece regardless of its thickness or thickness.

e) Since it works in the same way as a saw blade with sharp edges on both sides of each tooth, the ability of the edge does not deteriorate as easily as with conventional saw teeth, and maintains its performance as a saw. Are better.

``) Since no impact is applied, the cutting noise is low and it is possible to cut hard materials.

g) Since the teeth have a versatile ability, there is no need to make many different types of saws, and one saw can handle many types of materials to be cut.

h) Bacteria will not get into the object to be cut, so there is no need to worry about the tooth becoming seriously chipped.

[Brief explanation of drawings]

Fig. 1 is an enlarged partial plan view showing an embodiment of the saw blade of the present invention, Fig. 2 is a partial side view thereof, Fig. 3 is a partial sectional view of a steel strip showing the cutting state, and Fig. 4 is the part thereof. 5 is a side view of FIG. 4, FIG. 6 is a front view of a cutter suitable for processing the saw blade of the present invention, FIG. 7 is a side view thereof, and FIG.
The figure is a partial plan view showing the state in which two blades are applied to the upper surface of the thick part of the steel strip, Figure 9 is a partial perspective view showing the state in the middle of the cutting and raising work, and Figure 10 is the saw blade of the present invention A schematic partial plan view showing another embodiment, FIG. 11 is a partial side view thereof,
FIG. 12 is a schematic partial plan view showing still another embodiment of the present invention, FIG. 13 is a partial side view thereof, FIG. 14 is a partial side view of a conventional saw, and FIG. 15 is a partial side view of the saw of FIG. 14. 16 is a partial side view of a conventional band saw, and FIG. 17 is a partial plan view of the band saw shown in FIG. 16. 1 is a steel strip, 2 is a base, 3 is a thick part, 4, 4a is a cutting part,
5, 5a are tooth tops, 7 is a cutter 9 is a blade, 10a, 10
b, -=, 12a, 12b. -= 14a, 14b, =-, 16a, 16b, -・
・Teeth, lla, llb, -, 13a, 13b. -, 15a, 15b, -, 17a, 17b, ... are the tops of the teeth. Figure Figure Figure Mu Figure Figure Figure

Claims (3)

[Claims] (1) On the upper surface of the thick part of a steel strip having a generally dovetail-shaped cross section, one side of which is thickened by expanding outward into an inverted trapezoidal cross-section, a A saw tooth characterized in that the top portion of the tooth is substantially continuously formed in a zigzag shape or a crisscross shape. (2) Approximately triangular pyramid-shaped cutting portions with side serrations are formed alternately and continuously from both sides of the thick section of the steel strip having a substantially dovetail cross section, and the longitudinal section of the steel strip is formed on the upper surface of the thick section. 2. The sawtooth according to claim 1, wherein the tooth apex portion oblique with respect to the direction is continuously formed in a zigzag shape. (3) Cut and raise the upper surface of the thick part of the steel strip having a substantially dome-shaped cross section by alternately cutting and raising teeth having a predetermined angle with respect to the longitudinal direction of the steel strip and teeth having a substantially symmetrical angle thereto. 2. The sawtooth according to claim 1, wherein the tooth crests oblique with respect to the longitudinal direction of the steel strip are substantially continuously formed in a zigzag shape or a crisscross shape.