JPH02279209A - Saw blade - Google Patents

Abstract

PURPOSE:To enable the cutting of hard materials and to reduce cutting resistance for restricting the bend of a blade and noises by providing plural groups of saw blades the tips of which approtimately match two or more kinds of mutually parellel virtual curves which changes periodically or at irregular periods. CONSTITUTION:Saw blades 7, 17 the tips of which match a virtual curve L1 are straight blades. the setting widths of left and right set blades 9L, 15R, 19L, 25R in a low blade group the tips of which match a vitual curve L2 is set wider than the setting widths of left and right set blades 11R, 13L, 21R, 23L in a high blade group the tips of which match the virtual curve L1. When the saw blades 7, 9L, 25R, 11R, 23L in the vicinity of the top is applied to a cutting material, cutting volume is large, and particularly the saw blades of the high blade groups perform cutting mainly to destroy and cut the processing hardening layer of the cutting portion and when the saw blades 17, 19L, 15R, 21R, 13L placed in vicinity of the bottom are applied, cutting volume is small so that they cut the cutting portion without the rub of the hardening layer and cutting resistance is reduced thereby. The bending tendancy in a left-right direction in the saw blades of the high blade group matching the virtual curve L1 is restricted because a component in a left-right direction toward the opposite side of the blades of the adjacent low blade group becomes large.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a saw blade such as a halafner, a circular saw, or a band saw, and more particularly relates to a saw blade for cutting uncut materials. This invention relates to a saw blade that can suppress cutting bending and noise.

(Prior Art) Conventionally, as an example of a band saw blade, a typical band saw blade has a constant band width and a constant left and right setting amount for each set tooth.

With a common band saw blade having the above configuration, cutting is often difficult, for example, when cutting difficult-to-cut materials that are likely to undergo work hardening.

Therefore, in order to cope with difficult-to-cut materials and to suppress noise during cutting of materials, various saw blades have been developed in which the height difference of the saw blade, the amount of set-off, and the pitch are changed. Furthermore, as shown in US Pat. No. 2,239,317, for example, a band saw blade has been developed in which the band width changes by periodically changing a virtual curve connecting the tips of a large number of saw teeth in the saw blade.

(Problems to be Solved by the Invention) However, in conventional band saw blades, the bending in the width direction of the band saw blade increases due to the increase in cutting resistance during cutting of materials, which tends to cause cutting bends. The sawtooth may scrape the hardened layer due to processing, which may generate noise.

This invention was made in view of the conventional problems as described above, and its purpose is to be able to cut difficult-to-cut materials and to reduce cutting resistance to suppress cutting bending and noise. The purpose is to provide saw blades.

[Structure of the invention] (Means for solving the problem) In order to achieve the above object, the saw blade according to the present invention has the following features:
A group of multiple sawtooths whose tooth tips approximately coincide with a first imaginary curve that changes periodically or irregularly, and a plurality whose tooth tips approximately coincide with a second imaginary curve that is parallel to the first imaginary curve. The sawtooth group includes at least two or more types of sawtooth groups.

(Function) When cutting a material to be cut with the saw blade having the above configuration, the plurality of saw teeth with high tooth heights whose tooth tips almost match the first imaginary curve mainly perform the cutting action, and the first imaginary curve The cutting load acting on the saw teeth located near the top of the cutting edge becomes large. Therefore, the sawtooth with a high tooth height near the top will make a large cut into the material to be cut, so even if a work-hardened layer is formed, the tip of the sawtooth will cut deeper than the work-hardened layer, causing work-hardening. The layer will be destroyed and cut. In addition, when the left and right set teeth with high tooth heights were elastically deformed so that the set width became narrower due to the component force in the left and right direction when cutting the material to be cut, the tooth tips almost coincided with the second imaginary curve. The left and right set teeth of multiple saw teeth with low tooth height act simultaneously on the cut surface of the material to be cut, and the cutting resistance in the direction orthogonal to the cut surface becomes large, making it difficult to cause cut bending. It is something.

That is, even if the material of the material to be cut is difficult to cut, it can be cut without causing any bending.

(Embodiment) Referring to FIGS. 1 and 2, a band saw blade is illustrated as an embodiment of the present invention. The saw blade 1 is provided with a large number of saw teeth on the opposite side of the back part 5 of the body part 3.

In this embodiment, the saw blade 1 includes a plurality of saw teeth 7, 11 . R, 13L, 17, 21R,
23L, and a plurality of sawtooths 9L, i5R, 19L, and 25R a whose tooth tips substantially coincide with a second virtual curve L2 parallel to the first virtual curve L1.

In other words, each of the saw teeth 7, ], 1. R, ], 3L, 1
．． The first virtual curve L1 is obtained by connecting the tooth tips of 7, 21R, , 23, and L with a smooth curve, and the tooth tips of each saw blade 9L, 1.5R, 19L, and 25R are connected with a smooth curve. When connected with a curved line, a second virtual curve L2 is obtained.

Since the first imaginary curve L1 is located on the outside and the second imaginary curve L2 is located on the inside, each sawtooth 7.1. ], R.

13L 17. 21R and 23L are sawtooth groups with high tooth height, and each sawtooth 9 whose tooth tip coincides with the second virtual curve L2
L, 15R, 191, and 25R are sawtooth groups with low tooth height. In this embodiment, there are two virtual curves Ll and Ll, but if, for example, a sawtooth with an intermediate tooth height is provided, there will be three virtual curves. That is, when a plurality of sawtooth groups having holes with various tooth heights are provided, the number of virtual curves is a plurality corresponding to the number of sawtooth groups of various heights. Also, the virtual curve Ll.

Although Ll is a gentle curve, it can also be a polygonal curve, as shown in FIG. 7, for example.

In the above saw blade 1, the saw teeth 7.17 are straight teeth that do not perform left and right set swinging, and the saw teeth]] R115R, 21R
, 25R is the right set tooth and saw tooth 9 that was used for right set swinging.
L, 1.3L, 1() and 123L are the left set teeth where the left set swing was performed.

The straight teeth 7 are tall teeth whose tooth tips coincide with the first imaginary curve L1, and as is clear from FIG. 1, they are located near the top of the imaginary curve L1 that protrudes downward.

As is clear from FIG. 2, in the saw blade 1, the left and right chamfered teeth 11R whose tooth tips coincide with the first virtual curve L1,
],, than the left and right clam width of 3L, 21R, 23L,
The left and right set widths of the left and right set teeth 9L and 15R119L2' 5R whose tooth tips coincide with the second virtual curve L2 are set larger.

In other words, in a plurality of sawtooth groups having different tooth heights, the set width of the sawtooth group with a lower tooth height is set larger than that of the sawtooth group with a higher tooth height.

” When cutting the workpiece W with the bipedal saw blade 1, the first. Second virtual curve L1. ．． A plurality of saw teeth 7□ 9L, 25R, ], ], , R, 2 located near the top of L2
When the saw blade 3L acts on the material to be cut W, the load on the material to be cut 4W in the cutting direction becomes large, the depth of cut becomes large, and the saw blade 1 bends so that the back becomes higher due to the cutting resistance. Teeth 7, 9L, 25R, 1], R, 23
The tip of the tooth L cuts the workpiece W so as to draw a trajectory S1 shown by a solid line in FIG.

At this time, a plurality of saw teeth 7. with high tooth heights whose tooth tips coincide with the first virtual curve L1. IIR, 23L mainly performs the cutting action, and the cutting load acting on the saw @7 located at the top of the first virtual curve L1 is large. Therefore, the bipedal sawtooth 7 makes a large cut into the material to be cut, and even if a work-hardened layer is formed at the cut portion of the material, the tooth tips of the bipedal sawtooth 7 or the work-hardened layer This results in a deeper cut than the previous one, destroying the work-hardened layer.

Also, 1st. A plurality of saws (!71.7.19 L, 1.5R
.

When 21R113L acts on the material to be cut W, the load on the material to be cut W in the cutting direction is small, so the deflection of the saw blade 1 is small and each tooth], 7. 1.9 L, ]5R,
The tooth tips of 21R and 13L follow the trajectory S shown by the broken line in Fig. 3.
The material to be cut W is cut as shown in FIG.

That is, in the saw blade 1, the virtual curve LL.

Since the cutting trajectories S1 and S2 of each tooth are shifted every cycle of L2, cutting can be performed without the subsequent saw teeth scraping the work-hardened layer of the workpiece W.

Therefore, cutting resistance can be reduced overall, cutting bending can be suppressed, and noise caused by an increase in cutting resistance can also be reduced.

Further, when cutting the workpiece W with the saw blade 1, the left and right set protrusions 23L, 21R, 13L, and IIR of the high tooth group whose tooth tips coincide with the first virtual curve L1 are in the left and right direction during cutting. When there is a tendency to elastically deform and escape inward due to the component force of
L exerts a large effect on the cut surface of the material to be cut W, and the resistance in the direction perpendicular to the cut surface increases, making it difficult to bend the cut material.

That is, in the saw blade 1, the saw teeth 7. of the high tooth group whose tooth tips coincide with the first virtual curve. The tendency of IIR and 23L to bend in the left-right direction (in the direction perpendicular to the plane of the paper in Fig. 1) is due to the fact that the component force in the left-right direction on the opposite side of the saw teeth 9L and 25R of the adjacent low teeth group increases. This suppresses cutting and bending.

In this case, since the low tooth groups are interspersed between the high tooth groups, cutting and bending can be effectively suppressed.

FIG. 4 shows a second embodiment. In this saw blade 1, the left and right set protrusions 11R, 13L, 21R, and 23L of the high teeth whose tooth tips coincide with the first imaginary curve L1,
Left and right clams f located on the top side of the first virtual curve L1
a23L, than the amount of clam rollout of IIR, virtual curve L1
The left and right set extensions 13L and 21R located on the bottom side are designed to have a larger set-off amount. Furthermore, similarly for low teeth whose tooth tips match the second virtual curve L2,
The right and left clams on the bottom side 19L and 15R are larger than the left and right clams on the top side, 9L and 25R.
The amount of clams drawn out is larger.

Further, in the saw blade 1, if we look at the left and right set protrusions in order before and after the straight tooth 7 or 17, for example, the left and right set protrusions 9L and 25R at the front and rear of the straight tooth 7 have opposite set directions. The swing amount and tooth height are set equal. Similarly, the left and right clams 23 before and after
L and IIR also have opposite set direction, but set set amount and tooth height are the same. Further, the next front and rear left and right set extensions 13L, 21R and the next left and right set extensions 19L, 15R have opposite set direction, and are provided with the same set amount and tooth height.

Therefore, the workpiece W is cut by the saw blade 1 according to this embodiment.
When cutting is performed, the same effect as the saw blade 1 shown in the first embodiment is produced, and the left and right set amount of the saw teeth in the high tooth group and the low tooth group are different depending on the tooth height. , the chips are further divided into smaller pieces, improving the ability to discharge them from between the saw teeth.

Furthermore, in the high tooth group and the low tooth group, the tooth heights are set equally (for example, 9L, 25R, 11R).

23L, etc.) are distributed with the same swinging amount on the left and right sides, so the cutting resistance on the left and right sides of the saw blade 1 is equalized, and cutting bending is suppressed.

FIG. 5 shows yet another embodiment, which is different from the saw teeth 7, 25R in the embodiment shown in FIG.
, 23L, 21R, 19L, 1715R, 13L, II
The sawtooth is 7.25L for the set pattern A, which has R and 9L as one set.

23R, 21L, 19R, 17, 15L, 13R.

A reverse set pattern B is arranged in which 11, L, and 9R are set as one set.

In this example, pattern A sawtooth 723L, 21
R, 17, 13L, IIR and pattern B sawtooth 7,
23R, 21L, 1.7, 13R11L are a group of high teeth whose tooth tips coincide with the first virtual curve L1, and pattern A
, each sawtooth 25R, 19L, 15R, 9L, 2 in B
5L 19R15L and 9R are groups of low teeth whose tooth tips coincide with the second virtual curve L2.

In this embodiment, a group of high teeth whose tooth tips coincide with a first imaginary curve and a group of low teeth whose tooth tips coincide with a second imaginary curve, and set pattern A and pattern B are provided. Since they are configured in opposite patterns, it is possible to cut difficult-to-cut materials and to suppress cutting bending more effectively.

In other words, if the clam opening pattern A is biased so that it has a characteristic of turning to the left, for example, if the clam opening pattern A is repeated, there is a strong tendency to turn to the left. .

However, in this embodiment, a set-up pattern B is provided which is the opposite of the set-off button A. Therefore, the clam opening pattern B is r-sari opening pattern A.
On the contrary, the saw blade 1 has the characteristic of cutting to the right, and the saw blade 1 as a whole can cut the material 4 in the shape of [7] without causing any bending.

FIG. 6 shows yet another embodiment, in which the setting pattern of the saw blade 1 shown in FIG. It is composed of

According to this embodiment, it is possible to achieve the effect of combining the combined forces of the saw blade illustrated in FIG. 4 and the saw blade illustrated in FIG. 5.

FIG. 7 shows still another embodiment, and shows a saw blade 1 in which the first and second virtual curves LL and L2 are polygonal curves, and the saw blade 1 is provided with set patterns A and B. be.

In addition, although the above-mentioned embodiment was illustrated in the case of a band saw blade, it can also be implemented for, for example, a circular saw blade. In addition, the virtual curve can be increased to a number of 2 ice cubes, and the number or pitch of saw teeth in one period of the virtual curve can be changed as appropriate to make the period of the virtual curve irregular. It is also possible to do so, and by doing so, it is possible to more effectively suppress an increase in noise due to resonance of the saw blade. That is, the present invention can be implemented in modes other than the embodiments described above by making various changes.

[Effects of the Invention] In short, according to the present invention, a group of high teeth whose tooth tips coincide with the first imaginary curve and a group of low teeth whose tooth tips coincide with the second imaginary curve are provided. This is because the set width of the low tooth group is made larger than the set width of the group. Therefore, the saw teeth that work effectively in the cutting direction are the saw teeth located near the top of the first imaginary curve in the group of high teeth, and are small in number, so that the saw teeth that work effectively in the cutting direction of the part concerned are It can be made large, the work-hardened layer can be easily destroyed, and difficult-to-cut surfaces can be cut, and bending and noise can be suppressed. Furthermore, the difference in the set width allows the chips to be divided into smaller pieces, reducing the load on each saw tooth and improving the life of the saw teeth.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a portion of a saw blade according to a first embodiment. FIG. 2 is a bottom view of the saw blade viewed from the tooth tip side. FIG. 3 is an explanatory diagram showing the cutting state of the material to be cut. FIG. 4 is a bottom view showing a portion of the saw blade according to the second embodiment. FIG. 5 is a bottom view of the saw blade according to the third embodiment. FIG. 6 is a bottom view of the saw blade according to the fourth embodiment. FIG. 7 is a front view of a portion of the saw blade according to the fifth embodiment. 1... Saw blade 7, 17... Straight tooth 9L, 13L, 19L, 23L... Left set tooth 11R
, 15R, 2], R, 25R...Right clam tooth representative
Patent Attorney Hidekazu Miyoshi

Claims (8)

[Claims] (1) A group of a plurality of sawtooths whose tooth tips almost match a first virtual curve that changes periodically or irregularly;
A saw blade comprising at least two groups of saw teeth, including a plurality of groups of saw teeth whose tooth tips substantially coincide with a second virtual curve parallel to the virtual curve. (2) The set width of a group of saw teeth with a low tooth height whose tooth tips almost match the second virtual curve is greater than the set width of a group of saw teeth with a high tooth height whose tooth tips almost match the first virtual curve. The saw blade according to claim 1, wherein the set width of the group is larger. (3) In a group of multiple sawtooths with high tooth heights whose tooth tips almost match the first imaginary curve, the setting stroke amounts of the left and right set teeth are different, and the left and right saw teeth have approximately the same set amount. In a group of a plurality of saw teeth with low tooth heights that are evenly prepared and whose tooth tips almost match the second virtual curve, the setting amount of the left and right setting teeth is different, and the setting amount of the left and right setting teeth is approximately equal to the second imaginary curve. The saw blade according to claim 1, characterized in that equal saw teeth are provided evenly on the left and right sides. (4) Claim (1) characterized in that, in a group of a plurality of saw teeth with high tooth heights whose tooth tips substantially coincide with the first imaginary curve, the orthogonal direction is located near the top of the first imaginary curve. The saw blade described in . (5) a group of a plurality of sawtooths whose tooth tips approximately coincide with a first virtual curve that changes periodically or irregularly;
A plurality of sawtooth groups whose tooth tips substantially coincide with a second virtual curve parallel to the virtual curve of A plurality of sets in which a plurality of teeth of three or more teeth are grouped into one set, and the sets having the same number of teeth include sets in which the setting patterns of set teeth are mutually opposite patterns. A saw blade featuring (6) The set width of multiple saw teeth with a low tooth height whose tooth tips almost match the second virtual curve is greater than the set width of multiple saw teeth with a high tooth height whose tooth tips almost match the first virtual curve. The saw blade according to claim 5, wherein the saw blade is larger than the saw blade. (7) In multiple saw teeth with high tooth heights whose tooth tips almost match the first imaginary curve, the setting stroke amounts of the left and right set teeth are made different, and the saw teeth with almost equal set amounts on the left and right are made equal on the left and right sides. In a plurality of low tooth height saw teeth whose tooth tips almost match the second imaginary curve, the setting stroke amounts of the left and right set teeth are different, and the left and right saw teeth with almost equal set amounts are Saw blade according to claim 5, characterized in that the saw blade is evenly distributed. (8) According to claim (5), in the plurality of saw teeth having high tooth heights whose tooth tips substantially coincide with the first imaginary curve, the straight teeth are located near the top of the first imaginary curve. saw blade.