JP3375932B2 - Saw blade - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saw blade, and more particularly, to a saw blade having a cutting tip connected to a tooth portion.

[0002]

2. Description of the Related Art A tip saw is known as a saw blade for cutting wood or the like. The structure of the conventional tip saw 2 is shown in FIG.

The tip saw 2 has a main body 4, a tooth portion 6 and a tip 8. The tip 8 is made of an alloy having a high wear resistance and is brazed to the tooth portion 6. Therefore, when processing wood or the like, there is an advantage that the wear of the cutting edge is small and the deterioration of sharpness can be suppressed.

Furthermore, since the shape of the tip 8 is simple, the cost for polishing the tip 8 can be kept low.

[0005]

However, the above-mentioned conventional tip saw 2 has the following problems. In the conventional tip saw 2, the tip 8 is usually
It was general that the thicknesses (sizes in the depth direction of the paper surface in FIG. 5, not shown) of the respective chips 8 were set to be the same in each chip 8.

Therefore, when cutting wood or the like, each of the chips 8 has to cut a material corresponding to the thickness of the chip 8, and the chip 8 is heavily loaded. Therefore, there is a problem that the cutting resistance is large.

In this case, if the thickness of each chip 8 is reduced, the cutting resistance is also reduced, but if the thickness of each chip 8 is reduced, the thickness of the main body 4 must also be reduced. In this case, the rigidity of the tip saw 2 becomes small, and bending and chattering easily occur.

Since the chips 8 have the same thickness,
Since wood and the like are finished by cutting once, there is also a problem that the work surface of the wood and the like becomes rough.

The present invention solves the above problems of the conventional tip saw and the like, and provides an inexpensive saw blade which has a small cutting resistance and is capable of obtaining a dense work surface and which is excellent in wear resistance. The purpose is to do.

[0010]

[Means for Solving the Problems, Actions and Effects of the Invention]
The saw blade according to claim 1 is provided with first and second cutting tips as cutting tips, and each of the first and second cutting tips has a top surface constituted by a plane orthogonal to the center plane of the main body,
A pair of side surfaces provided substantially symmetrically with respect to the center plane of the main body, and a pair of side surfaces formed adjacent to the top surface and constituted by planes substantially parallel to the center plane of the main body,
A rake face formed adjacent to the top face and the pair of side faces, and the effective height of the top face of the first cutting tip is higher than the effective height of the top face of the second cutting tip, First
The effective distance between the pair of side surfaces of the cutting chips is minor than the effective distance between the pair of side surfaces of the second cutting chip, the first and
The rake face of the second cutting tip is a pair of side faces.
Intersects with one or the other side at a constant acute angle
Consists of an inclined flat surface, which is adjacent to the first cutting tip.
The rake face of the two first cutting tips
And the adjacent two of the second cutting tips
Reverse the inclination direction of the rake face of the second cutting tip,
And the second cutting tip substantially intersects the adjacent tooth.
The feature is that they are arranged to each other .

Therefore, when cutting the work material, first, the first cutting tip is used to perform a cutting process with a narrow cutting width,
Then, cutting with the second cutting tip is performed so as to widen the narrow cutting width.

Therefore, the cutting margin of each cutting tip is not so large. Therefore, the cutting resistance can be reduced. Further, since the cutting is performed twice, it is possible to obtain a precise work surface.

Further, since the top surface and the pair of side surfaces each have a simple planar shape, it is easy to polish the cutting tip. Therefore, a saw blade having excellent wear resistance can be realized at low cost. Further, re-polishing after manufacturing is easy. Therefore, the sharpness can be easily recovered by re-polishing when the sharpness is lowered by use.

That is, it is possible to realize an inexpensive saw blade which has a small cutting resistance and is capable of obtaining a dense work surface and which is excellent in wear resistance. Also, cut the work material
In this case, first, the first cutting tip alternates the work surface of the work material.
To be sharply cut, then widen the narrow cutting width
In addition, the second cutting tip alternately sharpens the work surface of the work material.
Is cut. Therefore, to obtain a more precise work surface
You can In addition, the type of cutting tip and rake face
Regardless of the tilt direction, keep the rake face tilt angle constant.
Therefore, the polishing work is easy. Therefore, wear resistance
An excellent saw blade can be realized at low cost. Also,
Re-polishing after manufacturing is easy. Therefore, the
If the sharpness deteriorates, the sharpness can be easily changed by re-polishing.
Can be restored. Also, the cutting speed of the cutting tip
Even if the saw blade feed speed is relatively high,
Cutting of narrow cutting width is performed by the first cutting tip
Then, the second cutting edge is widened to widen the narrow cutting width.
To maintain the order in which cutting with
Is easy. That is, when the feed rate of the saw blade is high
Even if there is, the cutting resistance is small and a fine work surface can be obtained.
You can

In the saw blade according to claim 2, the first and second saw blades are provided.
Both sides of the cutting tip of the
It is constituted by a plane parallel to the inner surface .

[0016]

[0017]

In the saw blade of claim 3, the thickness of a portion of the tooth portion to which the first cutting tip is connected exceeds the effective height of at least the second cutting tip, the thickness of the second cutting tip Thinner than the thickness of the teeth where the chips are joined,
Is characterized by.

Therefore, for example, even when the effective distance between the pair of side surfaces of the first cutting tip is made smaller than the thickness of the main body, at least the second tooth portion of the tooth portion to which the first cutting tip is joined is formed. Avoiding the interference between the tooth and the work material by making the thickness of the portion at the position exceeding the effective height of the cutting tip smaller than the effective distance between the pair of side surfaces of the first cutting tip. You can

Therefore, while keeping the thickness of the main body thick,
The effective distance between the pair of side surfaces of the first cutting tip can be reduced. That is, it is possible to first perform a cutting process with a considerably narrow cutting width while preventing the saw blade from bending and chattering. Therefore, it is possible to obtain a precise work surface with a smaller cutting resistance.

In the saw blade of claim 4, the saw blade is
Disc-shaped body and multiple teeth protruding from the outer circumference of the body
Portion, first and second cutting tips coupled to the tooth portion,
Is provided .

[0022]

[0023]

In the saw blade according to claim 5, the difference between the effective height of the top surface of the first cutting tip and the effective height of the top surface of the second cutting tip is 0.5 mm or more and 5 mm or less, The difference between the effective distance between the pair of side surfaces of the first cutting tip and the effective distance between the pair of side surfaces of the second cutting tip is 0.2 mm or more and 2 mm or less.

Therefore, even when the feed rate of the saw blade is considerably higher than the cutting rate of the cutting tip, first of all,
It is easy to maintain the order in which the narrow cutting width is cut by the cutting tip and the second cutting tip is then cut so as to widen the narrow cutting width.

That is, even when the feed rate of the saw blade is considerably high as in the case of processing wood, for example, it is possible to obtain a precise work surface with a small cutting resistance.

[0027]

1 is a drawing showing the construction of a tip saw 12 which is a saw blade according to an embodiment of the present invention. FIG. 2 is a drawing schematically showing a cross section II-II in FIG. FIG. 3 is a drawing schematically showing an arrow III in FIG.

As shown in FIG. 1, the tip saw 12 has a metal disk-shaped main body 14 having a mounting hole 14b in the center, and a plurality of tooth portions 1 projecting from the outer periphery of the main body 14.
It is a circular saw provided with 6 and 18. The teeth 16, 18 have
A tip 20 which is a first cutting tip and a tip 22 which is a second cutting tip, both of which are made of an alloy having wear resistance, are joined by brazing.

As shown in FIG. 3, the chip 20 includes a main body 1
Top surface 20 constituted by a plane orthogonal to the center plane 14a of No. 4
a, and a pair of side surfaces 20b and 20c provided substantially symmetrically with respect to the center plane 14a of the main body 14. Side 2
0b and 20c are both formed adjacent to the top surface 20a and are formed by planes parallel to the central surface 14a of the main body 14.

The structure of the chip 22 is almost the same as that of the chip 20. However, as often shown in FIG. 2, the effective height h1 of the top surface 20a of the chip 20 is higher than the effective height h2 of the top surface 22a of the chip 22. Further, the effective distance w1 between the pair of side surfaces 20b and 20c of the chip 20 is
Is smaller than the effective distance w2 between the pair of side surfaces 22b, 22c.

Therefore, as will be described later, when cutting wood as a work material, first, a cutting process with a narrow cutting width is performed corresponding to the effective distance w1 of the tip 20, and then the narrow cutting width is widened. As described above, cutting is performed corresponding to the effective distance w2 of the tip 22.

Therefore, the cutting margin of each of the chips 20 and 22 is not so large. Therefore, the cutting resistance can be reduced. In addition, since the cutting is performed twice, it is possible to obtain a precise work surface.

Further, in each of the chips 20 and 22, the top surfaces 20a and 22a and the pair of side surfaces 20 are formed.
Since each of b, 20c and 22b, 22c has a simple planar shape, the polishing work of the chips 20, 22 is easy. That is, it is possible to perform the polishing work, which generally requires skill and has a high cost burden rate, at low cost, and it is possible to obtain the chips 20 and 22 having high dimensional accuracy.

Therefore, a highly accurate tip saw having excellent wear resistance can be realized at low cost.

That is, it is possible to realize an inexpensive tip saw which has a small cutting resistance and is capable of obtaining a dense work surface and which is excellent in wear resistance.

As shown in FIG. 3, the top surface 20 of the chip 20 is
A rake face 20d is formed adjacent to a and the pair of side faces 20b and 20c.

The rake face 20d of the tip 20 is formed by an inclined flat surface that intersects either of the pair of side faces 20b and 20c at a constant acute angle. Further, of the plurality of chips 20, two chips 20 adjacent to each other are configured so that the inclination directions of the rake faces are opposite.

A rake face 22d similar to that of the chip 20 is also formed on the chip 22, and the rake faces of two adjacent chips 22 of the plurality of chips 22 are arranged so that the inclination directions thereof are opposite to each other. There is.

Therefore, as will be described later, when cutting wood, first, the work surface of the wood is alternately cut with the sharp edges 20e by the tip 20 having the rake faces 20d in different inclination directions, and thereafter, The rake face 22d having different inclination directions so as to widen the narrow cutting width.
The cutting surface of wood is cut alternately with the sharp edges 22e by the tip 22 having the. Therefore, a more precise work surface can be obtained.

Furthermore, the inclination angle of the rake faces 20d and 22d is constant regardless of the type of the chips (that is, the tips 20 and 22) and the inclination directions of the rake faces 20d and 22d, so that the polishing operation is easy. That is, with the relationship between the polishing table (not shown) and the grindstone (not shown) fixed at a fixed angle, the tip saw 12 to which the respective chips are joined is joined.
All the rake faces 20d and 22d can be easily polished by simply turning the inside out.

Further, in this embodiment, as shown in FIG. 2, the thickness t1 of the portion 16a of the tooth portion 16 to which the tip 20 is connected is located at least at a position exceeding the effective height h2 of the tip 22. Tooth 1 to which the tip 22 is connected
It is made thinner than the thickness t2 of No. 8.

More specifically, in this embodiment, the effective distance w1 between the pair of side surfaces 20b, 20c of the chip 20 is made thinner than the thickness of the main body 14. Even in such a case, the thickness of at least a portion 16a of the tooth portion 16 to which the tip 20 is coupled at a position exceeding the effective height h2 of the tip 22 is set to the thickness of the pair of side surfaces 20 of the tip 20.
By making it thinner than the effective distance w1 between b and 20c, it is possible to avoid interference between the tooth portion 16a and the wood.

Therefore, the effective distance w1 between the pair of side faces 20b, 20c of the chip 20 can be reduced while keeping the thickness of the main body 14 thick. That is, it is possible to first perform a cutting process with a considerably narrow cutting width while preventing the tip saw 12 from bending and chattering. For this reason, it is possible to obtain a precise work surface with a smaller cutting resistance.

In this embodiment, the chip 2
0 and chips 22 are arranged alternately on the outer periphery of the main body 14.

Therefore, even if the feed speed of the tip saw 12 is relatively high compared to the cutting speed of the tips 20 and 22 (the peripheral speed of the tips 20 and 22), the tip 20 is first processed.
It is easy to maintain the order in which the cutting process is performed with a narrower cutting width, and then the cutting with the tip 22 is performed so as to widen the narrow cutting width.

That is, even when the feed speed of the tip saw is high, such as when cutting wood, the cutting resistance is small,
In addition, a precise work surface can be obtained.

The size of the tip saw 12 according to this embodiment is not particularly limited. For example, the effective height h1 of the top surface 20a of the tip 20 and the top surface 2 of the tip 22 are, for example.
The difference from the effective height h2 of 2a is preferably 0.5 mm or more and 5 mm or less.

Further, the pair of side surfaces 20b, 2 of the chip 20
0c effective distance w1 and the pair of side surfaces 22 of the chip 22
The difference from the effective distance w2 between b and 22c is preferably 0.2 mm or more and 2 mm or less.

In this way, even if the feed speed of the tip saw 12 is considerably higher than the cutting speed of the tips 20 and 22, the tip 20 is first used to perform a cutting operation with a narrow cutting width, and then It becomes easy to maintain the order in which cutting by the tip 22 is performed so as to widen the narrow cutting width.

That is, even when the tip saw 12 is fed at a considerably high speed, for example, when processing wood or the like, it is possible to obtain a precise work surface with a small cutting resistance.

The difference between the above-mentioned effective heights h1 and h2 is more preferably 0.5 to 4 mm, further preferably 1 to 3 mm, and further preferably
It can be 1.5 to 2.5 millimeters, more preferably about 2 millimeters.

The difference between the above-mentioned effective distances w1 and w2 is more preferably 0.3 to 1.8 mm, further preferably 0.5 to 1.5 mm, further preferably 0.7. It can be ~ 1.3 mm, more preferably about 1 mm.

As an example in this embodiment, for example, each dimension has an outer diameter of 180 mm (that is, h1 = 90 mm above), h2 = 88 mm, and a thickness of the main body 14 is 2.2 mm (that is, t2).
= 2.2 mm), t2 = 1.5 mm,
w1 = 2 mm, w2 = 3 mm, number of teeth 4
There is a tip saw for woodworking, which has 0 (the same number of tips 20 and 22).

Next, based on FIGS. 4A to 4C,
How the tip saw 12 cuts the wood 80 will be described.

First, as shown in FIG. 4A, the tip saw 1
2 tip 20 (see FIG. 2) allows the end 8 of the wood 80 to
2 is cut to form a concave portion 84.

Then, when the tip saw 12 is fed in the X1 direction relative to the wood 80, as shown in FIG. 4B,
The chip 22 (see FIG. 2) allows the work surface 86 of the recess 84 to be cut.
A new surface 88 to be machined is formed so as to finish. At this time, the chip 20 forms a new recess 90.

By continuously performing such an operation, a new surface to be machined 88 and a concave portion 90 are sequentially formed to be in the state shown in FIG. 4C, or the wood 80 is eventually cut into two pieces. As described above, the concave portion 84 is first formed, and the new workpiece surface 88 is formed so as to finish the workpiece surface 86 of the concave portion 84, so that the cutting resistance of the tip saw 12 is small and a smooth workpiece surface 88 is obtained. Of.

In this embodiment, one saw blade has the same number of the first cutting tips and the second cutting tips, which are arranged alternately around the main body. The invention is not limited to this.

For example, different numbers of first cutting tips and second cutting tips can be used. in this case,
For example, one primary cutting tip followed by several secondary
It is also possible to arrange the cutting chips of the above, and conversely, it is possible to arrange several first cutting chips after one second cutting chip.

Further, in this embodiment, the thickness of at least a portion of the tooth portion to which the first cutting tip is coupled exceeds the effective height of the second cutting tip, is set to the second cutting tip. The thickness is smaller than the thickness of the tooth portion to be joined, but the present invention is not limited to this.

For example, when the effective distance between the pair of side surfaces of the first cutting tip is thicker than the thickness of the main body, the thickness of the tooth portion to which the first cutting tip is joined is not necessarily
It need not be thinner than the thickness of the tooth to which the second cutting tip is joined.

Although the circular saw is described as an example in this embodiment, the present invention is not limited to the circular saw. For example, it can be applied to a band saw, a hand saw and the like.

In this embodiment, the saw blade for woodworking has been described as an example, but the present invention is not limited to the saw blade for woodworking. For example, it can be applied to a saw blade for synthetic resin, a saw blade for metalwork, and a saw blade for stone.

[Brief description of drawings]

FIG. 1 is a drawing showing a configuration of a tip saw 12 which is a saw blade according to an embodiment of the present invention.

FIG. 2 is a drawing schematically showing a cross section II-II in FIG.

3 is a drawing schematically showing an arrow III in FIG.

4A to 4C are drawings for explaining how the tip saw 12 cuts wood 80. FIG.

FIG. 5 is a drawing showing a structure of a conventional tip saw 2.

[Explanation of symbols]

14 ... ・ Main body 14a ... ・ Center plane 20 --- chip 20a ... ・ Top surface 20b, 20c ... 22 ... Chips 22a ... ・ Top surface 22b, 22c ... Sides h1 ・ ・ ・ ・ Effective height h2 ・ ・ ・ ・ Effective height w1 ... Effective distance w2 ・ ・ ・ ・ Effective distance

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 2001-30110 (JP, A) JP 4-27501 (JP, A) JP 8-118142 (JP, A) Actual Kai 7-30613 (JP, U) Actually open 57-90807 (JP, U) Actually open 2-23924 (JP, U) Actually open 60-190219 (JP, U) Actually open 63-134701 (JP, U) Actual KO58-32899 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) B27B 33/08 B23D 61/04

Claims (5)

(57) [Claims] 1. A substantially flat plate-shaped main body and tooth portions projecting from the main body
And a cutting tip connected to the tooth,
And First and second cutting tips are provided as the cutting tips.
Ke Both the first and second cutting tips are A top surface composed of a plane orthogonal to the center plane of the main body, With a pair of side surfaces that are provided approximately symmetrically with respect to the center plane of the main body
It is formed adjacent to the top surface of the main body and
A pair of side surfaces formed by planes substantially parallel to the center plane, A rake formed adjacent to the top surface and a pair of side surfaces
Face and Is equipped with The effective height of the top surface of the first cutting tip is the second cutting tip
Higher than the effective height of the top surface of The effective distance between the pair of side surfaces of the first cutting tip is the second cutting edge.
Less than the effective distance between a pair of sides of the cutting tipThe Any of the rake faces of the first and second cutting tips
Also for one or the other of the pair of side surfaces
Consists of inclined planes that intersect at a constant acute angle, Two adjacent first cuts of the first cutting tip
While reversing the inclination direction of the rake face of the tip,
Of the second cutting tips, two adjacent second cutting chips are used.
Reverse the inclination direction of the rake face, Install the first and second cutting tips on the adjacent teeth.
Qualitatively staggered, Saw blade characterized by. 2. The saw blade according to claim 1,The pair of side surfaces of the first and second cutting tips are
Is composed of a plane parallel to the center plane of the main body.
When, Characterized by. 3. The saw blade according to claim 1 , wherein the saw blade is located at a position exceeding at least the effective height of the second cutting tip among the tooth portions to which the first cutting tip is joined. The thickness of the portion is made thinner than the thickness of the tooth portion to which the second cutting tip is joined. 4. The saw blade according to any one of claims 1 to 3.
AtThe saw blade projects into the disk-shaped body and the outer periphery of the body.
The plurality of tooth portions provided, and the tooth portion coupled to the tooth portion
A first and a second cutting tip; Characterized by. 5. The saw blade according to claim 1, wherein the difference between the effective height of the top surface of the first cutting tip and the effective height of the top surface of the second cutting tip is 0. 5 mm or more and 5 mm or less, the effective distance between the pair of side surfaces of the first cutting tip and the second
The difference between the effective distance between the pair of sides of the cutting tip of
It is characterized in that it is not less than 2 mm and not less than mm.