JPH1128615A - Saw blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a saw blade having the clearance angle, rake angle and tooth angle of a tooth top set so as to suit for the action of each tooth. SOLUTION: A saw blade 1 is composed of a straight tooth A and plural set teeth B, C,... as one group and a biting property is improved by enlarging the tooth tip clearance angle α and tooth tip rake angle θ of the straight tooth with a few right/left swing and minifying a tooth angle β and also in the set teeth B, C,... with a large set width by which the right/left swing is enlarged, a chipping and tooth lack are prevented by minifying the tooth tip clearance angle α and the tooth tip rake angle θ and enlarging the tooth angle β. By changing the tooth height H of the set teeth B, C,... in response to the set width, the straight tooth A cuts a work and the other advance tooth B expands this cut part and a succeeding tooth C having a lower tooth height than that of this advance tooth B expands the cut part further.

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 such as a band saw, a circular saw or a hacksaw. More specifically, the present invention relates to a saw blade for cutting a work piece with large vibration such as cutting of a sheet pile or the like and a work piece which generates a large cutting resistance such as a difficult-to-cut material.

[0002]

2. Description of the Related Art Conventionally, a band saw machine has been used as a device for cutting (cutting) a large workpiece made of metal, for example. In the band saw blade used for this band saw machine,
For example, in order to cope with chatter vibration, noise, and the like, the pattern of the “set” is set to various patterns such as a laker set, a wave set, or a straight set, and the pitch of each tooth is made unequal. Further, in order to cope with difficult-to-cut materials such as stainless steel, band saw blades having different tooth height dimensions of each tooth have been developed.

Further, as described in Japanese Patent Publication No. 7-24973 and Japanese Patent Publication No. 7-41467, the fineness of chips can be reduced by appropriately combining the tooth height dimensions and the set width of each tooth. Saw blades whose performance has been greatly improved by realizing them are also in practical use.

[0004]

However, it has left set teeth bent to the left, right set teeth bent to the right, and straight teeth that are not bent left and right. In the case of a saw blade in which the set width is changed to a plurality of types, a tooth having a larger set width at the time of entry into which the workpiece is cut (when the tooth of the saw blade comes into contact with the work piece and starts cutting) is used. Large swing in the direction opposite to the swing direction. Here, since the straight teeth are formed without bending right and left, they do not relatively swing left and right when entering the work piece.

[0005] Thus, there is a problem in that the greater the set tooth bulges, the greater the impact upon entering the work piece, and the more likely it is to cause chipping and chipping.

Further, since the straight teeth serve to improve the straightness of the cutting, there is room for improving the biting property by a small amount of run-out to the left and right. In addition, since there is a difference in the function of each tooth, the clearance angle, rake angle, and tooth angle of the tooth tip suitable for the function of each tooth should be set individually. The same clearance angle, rake angle, and tooth angle are set, and there is room for improvement.

As the speed of the cutting operation with the saw blade has been increasing year by year, troubles such as chipping and tooth chipping which have not occurred at the conventional cutting speed have been increasing.
In particular, in the cutting market for H-section steels, pipes, difficult-to-cut materials and the like, higher performance saw blades are required.

An object of the present invention is to pay attention to the above-mentioned conventional technology, and has a clearance angle, a rake angle, and a tooth angle of a tooth tip set so as to be suitable for the function of each tooth. Another object of the present invention is to provide such a saw blade and to provide a more sophisticated and economical saw blade to meet the needs of the market.

[0009]

According to a first aspect of the present invention, there is provided a saw blade having at least one straight tooth and a plurality of set teeth bent in the left-right direction. A saw blade provided with a plurality of set widths of the set teeth, wherein the clearance angle of the tip of the straight tooth is equal to or larger than the tip clearance angle of the set tooth having the smallest set width. In addition, a set tooth having a larger set width has a smaller tip clearance angle.

Accordingly, a saw blade is formed by grouping the straight teeth and a plurality of set teeth as one group, and the clearance between the straight teeth with less left and right run-out is increased to improve the biteability, and the right and left run-out is reduced. For a set tooth having a large set width, the tip clearance angle is reduced to increase the tip strength and prevent chipping and chipping.

According to a second aspect of the present invention, the saw blade has at least one straight tooth and a plurality of set teeth bent in the left-right direction as a group, and a plurality of set widths of the plurality of set teeth are provided. Wherein the tooth tip rake angle of the straight tooth is equal to or larger than the tooth tip rake angle of the set tooth with the smallest set width, and the tip rake angle of the set tooth with a larger set width is smaller. It is characterized by the following.

Accordingly, a saw blade is formed by assembling the straight teeth and a plurality of set teeth as one group, and the straight teeth with less left and right run-out are enlarged to improve the bite angle, and the right and left run-out is reduced. With regard to the set teeth having a large set width, the tip rake angle is reduced to increase the tip strength to prevent chipping and chipping.

The larger the set width of the set teeth, the smaller the tooth tip rake angle, so that the tooth angles are increased and the rigidity is further increased. Therefore, the rigidity of the saw blade against the component force in the thickness direction at the time of cutting is increased, and the cutting accuracy is further improved.

According to a third aspect of the present invention, the saw blade has at least one straight tooth and a plurality of set teeth bent in the left-right direction as a group, and a plurality of set widths of the plurality of set teeth are provided. Wherein the tooth angle of the straight tooth is equal to or smaller than the tooth angle of the set tooth having the smallest set width, and the tooth angle is larger for set teeth having a larger set width. It is.

Therefore, a saw blade is formed by grouping the straight tooth and a plurality of set teeth as one group, the tooth angle of the straight tooth with less left and right run-out is reduced to improve the biting property, and the right and left run-out is increased. For set teeth with a large set width, the tip angle is increased by increasing the tooth angle to prevent chipping and chipping.

The larger the set width of the set teeth, the larger the tooth angle, and therefore the greater the rigidity. Therefore, the rigidity of the saw blade against the component force in the thickness direction at the time of cutting is increased, and the cutting accuracy is further improved.

[0017] The saw blade according to the invention according to claim 4 comprises a plurality of leading teeth which perform cutting prior to cutting of a workpiece;
A plurality of trailing teeth for expanding a cutting portion cut by the leading tooth are provided as a group, and the leading tooth has at least one straight tooth and at least one pair of set teeth bent in the left-right direction. The trailing teeth each have at least a pair of set teeth bent in the left-right direction, and the height dimension of the leading tooth is larger than the tooth height dimension of the trailing tooth, and the trail width of the trailing tooth is the leading tooth. The clearance angle of the straight tooth is α _A , the clearance angle of the tip of the set tooth included in the leading tooth is α _B , and the clearance angle of the tip of the set tooth included in the leading tooth is α _B. Α _A ≧ when the tooth clearance angle α _C
It is characterized in that it is α _B> α _C.

Accordingly, a saw blade is formed by grouping the straight tooth and a plurality of set teeth as one group, and the clearance between the straight teeth with less left and right runout is increased to improve the bite-in property, and the right and left runout is increased. For a set tooth having a large set width, the tip clearance angle is reduced to increase the tip strength and prevent chipping and chipping. Further, the cutting portion cut by the preceding tooth is further expanded by the succeeding tooth having a tooth height lower than the tooth height of the preceding tooth.

A saw blade according to a fifth aspect of the present invention includes a plurality of leading teeth that perform cutting prior to cutting a workpiece;
A plurality of trailing teeth for expanding a cutting portion cut by the leading tooth are provided as a group, and the leading tooth has at least one straight tooth and at least one pair of set teeth bent in the left-right direction. The trailing teeth each have at least a pair of set teeth bent in the left-right direction, and the height dimension of the leading tooth is larger than the tooth height dimension of the trailing tooth, and the trail width of the trailing tooth is the leading tooth. A saw blade that is larger than the set width of the straight tooth, the tip rake angle of the straight tooth is θ _A , the tip rake angle of the set tooth included in the leading tooth is θ _B , and the set tooth of the trailing tooth is the tooth top rake angle when the theta _C, is characterized in that it is _{θ a ≧ θ B> θ C} .

Accordingly, a saw blade is formed by grouping the straight tooth and a plurality of set teeth as one group, and the tooth squeeze angle of the straight tooth with less left and right run-out is increased to improve the biting property, and the right and left run-out is increased. With regard to the set teeth having a large set width, the tip end rake angle is reduced to increase the tip end strength to prevent chipping and chipping. Further, the cutting portion cut by the preceding tooth is further expanded by the succeeding tooth having a tooth height lower than the tooth height of the preceding tooth.

According to a sixth aspect of the present invention, there is provided a saw blade comprising: a plurality of leading teeth which perform cutting prior to cutting a workpiece;
A plurality of trailing teeth for expanding a cutting portion cut by the leading tooth are provided as a group, and the leading tooth has at least one straight tooth and at least one pair of set teeth bent in the left-right direction. The trailing teeth each have at least a pair of set teeth bent in the left-right direction, and the height dimension of the leading tooth is larger than the tooth height dimension of the trailing tooth, and the trail width of the trailing tooth is the leading tooth. The tooth angle of the straight tooth is β _A , the tooth angle of the set tooth included in the leading tooth is β _B , and the tooth angle of the set tooth included in the trailing tooth is β when is _C, it is characterized in that a _{β C> β B ≧ β a} .

Therefore, a saw blade is formed by grouping a straight tooth and a plurality of set teeth into one group, and the tooth angle of the straight tooth with less left and right run-out is reduced to improve the biting property, and the set is made to increase left-right run-out. For wide set teeth, the tip angle is increased by increasing the tooth angle to prevent chipping and chipping. Further, the cutting portion cut by the preceding tooth is further expanded by the succeeding tooth having a tooth height lower than the tooth height of the preceding tooth.

According to a seventh aspect of the present invention, the saw blade has at least one straight tooth and a plurality of set teeth bent in the left-right direction as a group, and a plurality of set widths of the plurality of set teeth are provided. The clearance angle of the straight tooth tip is α _A , the clearance angle of the shortest set tooth is α _B , the clearance angle of the other set teeth is α _C ,
α _D , α _E ……, α _A ≧ α _B > (α _C ≧ α
It is characterized in that a _D ≧ _{α E} ≧ ......).

Therefore, the clearance angle of the tip of a straight tooth with less left and right run-out is made larger than the clearance angle of the tip of a set tooth with the smallest set width, thereby improving the biteability. Further, since the right and left runout increases as the set width increases, the tip clearance angle is reduced as the set width increases, thereby increasing the tip strength and preventing chipping and chipping.

[0025] A saw blade according to the invention according to claim 8 has at least one straight tooth and a plurality of set teeth bent in the left-right direction as a group, and a plurality of set widths of the plurality of set teeth are provided. Of the straight tooth tip, θ _A , the tip edge rake angle of the shortest set tooth, θ _B , and the tip edge rake angles of the other set teeth, θ _C , θ _D , Θ _E ……, θ _A ≧ θ _B > (θ
It is characterized in that a _{C ≧ θ D ≧ θ E ≧} ......).

Therefore, the bite angle of the tooth tip of the straight tooth with less left and right run-out is made larger than the bite angle of the set tooth with the smallest set width, thereby improving the biteability. Further, since the right and left run-out becomes larger as the set width becomes larger, the tip end skewing angle is made smaller as the set width becomes larger, thereby increasing the tip end strength and preventing chipping and chipping.

According to a ninth aspect of the present invention, the saw blade has at least one straight tooth and a plurality of set teeth bent in the left-right direction as a group, and a plurality of set widths of the plurality of set teeth are provided. The tooth angle of the straight tooth is β _A , the tooth angle of the shortest set tooth is β _B , and the tooth angles of the other set teeth are β _C , β _D , β _E …… when, it is characterized in that it is _{(β C ≧ β D ≧ β} E ≧ ......)> β B ≧ β a.

Therefore, the bite angle of the straight tooth with less left and right runout is made smaller than the tooth angle of the set tooth with the smallest set width, thereby improving the biteability. In addition, since the right and left deflection increases as the set width increases, the tooth angle is increased as the set width increases, thereby increasing the tip strength and preventing chipping and chipping.

According to a tenth aspect of the present invention, the saw blade has at least one straight tooth and a plurality of set teeth bent in the left-right direction as a group, and a plurality of set widths of the plurality of set teeth are provided. A tooth width of a straight tooth at a reference line position set at a predetermined height from the tip of the straight tooth or set tooth in a straight portion of the rake face and flank face of the straight tooth and set tooth. the X _a, the smallest tooth width set teeth having set width and X _B, the tooth width X _C other set teeth, X _D, when the _{X E ......, X a ≦ X} B
<(X _C ≦ X _D ≦ X _E ...).

Therefore, by increasing the tooth width of a set tooth having a large set width in which the right and left runout is greater than the tooth width of a straight tooth having a small left and right runout, the tip end strength is increased to prevent chipping and chipping. .

A saw blade according to the present invention has at least one straight tooth and a plurality of set teeth bent in the left-right direction as a group, and a plurality of set widths of the plurality of set teeth are provided. A tooth width of a straight tooth at a reference line position set at a predetermined height from the tip of the straight tooth or set tooth in a straight portion of the rake face and flank face of the straight tooth and set tooth. the X _a, the smallest tooth width set teeth having set width and X _B, the tooth width X _C other set teeth, X _D, when the _{X E ......, X a <X} B
≦ (X _C ≦ X _D ≦ X _E ...) And is effective when the set width of the set tooth with the smallest set width is close to the set width of the other set teeth. Therefore, the tooth width of straight teeth with less left and right runout is minimized to improve biteability, and the tooth width is increased for set teeth with large left and right runout, thereby increasing tooth tip strength. To prevent chipping and chipping.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows a method for setting the clearance angle α, the rake angle θ, and the tooth angle β of the saw blade 1. In other words, in the setting of the clearance angle α, the rake angle θ, and the tooth angle β, the total is usually 90 degrees and the tooth angle β is automatically changed by the change of the clearance angle α and the rake angle θ. Let me.

FIG. 3 shows a clearance angle α, a rake angle θ, and a tooth angle β.
And the general relationship between tooth tip strength and bite strength. Here, the clearance angle α and the rake angle θ have the same effect on the tooth tip strength and biteability, but the degree of influence per unit angle on the tooth tip strength is greater than the squeeze angle θ.
Is known to be larger.

FIGS. 1A, 1B and 4C and FIG.
Referring to (A), (B), and (C), a saw blade 1 that forms one group with five teeth is shown. This saw blade 1
Is a predetermined reference line K for all teeth before the set is dispensed.
L has substantially the same tooth height H as L.

This saw blade has one straight tooth A, a pair of left and right set teeth B having a small set width, and a pair of left and right set teeth C having a large set width in one group, and θ _A = θ. _B
= Θ _C is exemplified. Straight tooth A, as shown because the right and left deflection is small because of the linearity improvement in FIG. 4 (A), have improved biting property by increasing the clearance angle alpha _A.

Since the set teeth C have the largest set width, the left and right runout is large, and chipping and chipping are likely to occur. Therefore, as shown in FIG. _C is reduced. In addition, set teeth B
Since the set width is relatively small, as shown in FIG. 4B, the clearance angle α _B is set between the clearance angles α _A and α _C , and this clearance angle α _{B is set} to the clearance angle. It may be the same size as _{α a (α a ≧ α B} > α C).

The larger the set width, the smaller the tip clearance angle is, so that the tooth angle is increased and the rigidity is increased. Therefore, the rigidity of the saw blade against the component force in the thickness direction at the time of cutting is increased, and the cutting accuracy is further improved.

Specifically, when the rake angles θ _A , θ _B , and θ _C are constant, the clearance angle α _{A is set} to 30 to 40 degrees,
In particular, 33 degrees to 37 degrees are preferable. The clearance angle α _B is 27 degrees ~
40 degrees, and particularly preferably 30 degrees to 35 degrees.
_It may be the same as _A. The clearance angle α _C is 20 degrees to 3 degrees.
5 degrees, and particularly preferably 23 degrees to 32 degrees.

Although two kinds of widths are set as the set width as described above, one group may be composed of five or more teeth and three or more kinds of widths may be set. At this time, α _A ≧
If the relationship of α _B is satisfied, other set teeth C, D,
In E... (D, E... Are not shown), the larger the set width, the smaller the tooth clearance angle α may be. That is, other set teeth C, D, relief angle alpha _C of E ......, alpha _D, when the _{α E ......, α A ≧ α} B>
(Α _C ≧ α _D ≧ α _E ...).

The order of arrangement of the teeth can be arbitrarily determined, but the teeth of the same set width must be paired on the left and right in the same group.

Next, referring to FIGS. 1A, 1B and 5C and FIGS. 5A, 5B and 5C, a saw blade forming one group with five teeth. 3 is shown. The saw blade 3 has substantially the same tooth height H with respect to the reference line KL before the set is swung, as with the saw blade 1 described above.

In this saw blade, one group includes one straight tooth A, a pair of left and right set teeth B having a small set width, and a pair of left and right set teeth C having a large set width. Α _A = α _B
= Α _C is exemplified. Straight tooth A is as shown in FIG. 5 (A) for the linearity improved because the left and right deflection is small, have improved biting property by increasing the rake angle theta _A.

Since the set tooth C has the largest set width, the left and right runout is large, and chipping and chipping are likely to occur. Therefore, as shown in FIG. _C is reduced. In addition, since the set width of the set tooth B is relatively small, as shown in FIG. 5B, the rake angle θ _{B is changed} to the rake angle θ _A and the rake angle θ.
_C , but this rake angle θ _B is
It may be the same size as _{A (θ A ≧ θ B>} θ C).

The larger the set width, the smaller the tooth tip rake angle of the set tooth, so that the tooth angle is increased and the rigidity is further increased. Therefore, the rigidity of the saw blade against the component force in the thickness direction at the time of cutting is increased, and the cutting accuracy is further improved.

Specifically, when the clearance angles α _A , α _B , and α _C are constant, the rake angle θ _A is 4 to 15 degrees, and particularly preferably 5 to 11 degrees. The rake angle θ _B is 3 degrees to 13 degrees, and particularly preferably 4 degrees to 10 degrees. Also, the rake angle θ _C
Is 0 to 11 degrees, and particularly preferably 0 to 7 degrees.

Although two kinds of widths are set as the set width as described above, one group may be composed of five or more teeth and three or more kinds of widths may be set. At this time, θ _A ≧ θ
Other set teeth C, D, E if the relation of _B is satisfied
(D, E,... Are not shown), a tooth with a larger set width may be provided so as to reduce the tooth tip rake angle θ. That is, other set teeth C, D, the rake angle of the E ...... θ _C, θ _D, when the _{θ E ......, θ A ≧ θ} B
> (Θ _C ≧ θ _D ≧ θ _E ...).

The order of arrangement of the teeth can be arbitrarily set, but the teeth of the same set width must be paired on the left and right in the same group.

Next, referring to FIGS. 1 (A), 1 (B) and 1 (C) and FIGS. 6 (A), 6 (B) and 6 (C), saw blades forming one group with five teeth. 5 is shown. All the teeth of the saw blade 5 have substantially the same tooth height H with respect to the reference line KL before the set is swung.

In this saw blade, one group has one straight tooth A, a pair of left and right set teeth B having a small set width, and a pair of left and right set teeth C having a large set width. Since the straight tooth A has a small left and right run-out, FIG.
As shown (A), the have improved biting property by reducing the tooth angle beta _A.

Since the set tooth C has the largest set width, the left and right run-out is large, and chipping and chipping are apt to occur. Therefore, as shown in FIG. _C is increased. Further, since the set tooth B is set width is relatively small as shown in FIG. 6 (B), although the tooth angle beta _B are the intermediate tooth angle beta _A and the tooth angle beta _C, the tooth angle the beta _B may be the same size as the tooth angle _{β a (β C> β B} ≧ β a).

The set teeth having a larger set width have a larger tooth angle, and therefore have higher rigidity. Therefore, the rigidity of the saw blade against the component force in the thickness direction at the time of cutting is increased, and the cutting accuracy is further improved.

[0053] More specifically, the tooth angle beta _A is 40 to 50 degrees, especially 44 degrees to 49 degrees are preferred. In tooth angle beta _B is 40 degrees to 55 degrees, in particular 45 to 50 degrees is preferable. Further, the tooth angle β _C is 45 to 75 degrees, and particularly preferably 48 to 67 degrees.

Although two kinds of widths are set as the set width as described above, one group may be formed by five or more teeth and three or more kinds of widths may be set. At this time, β _B ≧
If the relationship of β _A is satisfied, other set teeth C, D,
In E... (D, E... Are not shown), a tooth having a larger set width may be provided to increase the tooth angle β. That is, other set teeth C, D, the tooth angle beta _C of E ......, beta _D, when the _{β E ......, (β C ≧} β D ≧ β
_E ......)> may be a relationship of β _B ≧ β _A.

The order of arrangement of the teeth can be arbitrarily set, but the teeth of the same set width must be paired on the left and right in the same group.

In the above example, it is desirable that the larger the set width, the smaller the tip clearance angle or the rake angle, that is, the larger the set angle.

Next, referring to FIGS. 7 (A), 7 (B) and 7 (C) and FIGS. 8 (A), 8 (B) and 8 (C), saw blades forming one group with five teeth. 7 is shown. Unlike the case described above, the saw blade 7 has a height difference between the tooth heights before the set is swung. That is, as shown in FIG. 7A, the tooth heights H _A and H _B of the straight teeth A and the set teeth B before the set is swung.
Are substantially the same as the reference line KL, but the tooth height H _C of the set tooth _C is low and different.

The saw blade 7 has one straight tooth A, a pair of left and right set teeth B having a small set width, and a pair of left and right set teeth C having a large set width, and θ _A = θ
The case where _B = θ _C is illustrated. Straight tooth A, as is shown in FIG. 8 (A) for the linearity improved because the left and right deflection is small, have improved biting property by increasing the clearance angle alpha _A.

Since the set teeth C have the largest set width, the right and left runout is large, and chipping and chipping are likely to occur. Therefore, in order to increase the tooth tip strength, as shown in FIG. _C is reduced. In addition, set teeth B
As it is shown in FIG. 8 (B) so set width is relatively small, but are the intermediate clearance angle alpha _B the clearance angle alpha _A and the flank angle alpha _C, escape of clearance angle alpha _B angle It may be the same size as _{α a (α a ≧ α B} > α C).

Specifically, when the rake angles θ _A , θ _B , and θ _C are fixed, the clearance angle α _{A is set} to 30 to 40 degrees,
In particular, 33 degrees to 37 degrees are preferable. The clearance angle α _B is 27 degrees ~
40 degrees, and particularly preferably 30 degrees to 35 degrees.
_It may be the same as _A. The clearance angle α _C is 20 degrees to 3 degrees.
5 degrees, and particularly preferably 23 degrees to 32 degrees.

Although two kinds of widths are set as the set width as described above, one group may be formed of five or more teeth and three or more kinds of widths may be set. At this time, α _A ≧
If the relationship of α _B is satisfied, other set teeth C, D,
In E ..., the tooth clearance angle α may be reduced as the set width increases. That is, the clearance angles of the other set teeth C, D, E... Are α _C , α _D , α _E.
Where α _A ≧ α _B > (α _C ≧ α _D ≧ α _E ...)
May be established.

The order of arrangement of the teeth can be arbitrarily determined, but the teeth of the same set width must be paired on the left and right in the same group.

Further, the case where the saw blade 7 described here has two kinds of tooth heights has been described, but the same applies to two or more kinds of tooth heights.

Next, referring to FIGS. 7 (A), (B), (C) and FIGS. 9 (A), (B), (C), saw blades forming one group with five teeth 9 is shown. As shown in FIG. 7A, the saw blade 9 has a straight tooth A and a set tooth B having a tooth height H _A before the set is swung,
Although H _B is almost the same as the reference line KL, the tooth height H _C of the set tooth _C is low and different.

This saw blade has one straight tooth A, a pair of left and right set teeth B having a small set width, and a pair of right and left set teeth C having a large set width, and α _A = α. _B
= Α _C is exemplified. Straight tooth A, as is shown in FIG. 9 (A) for the linearity improved because the left and right deflection is small, have improved biting property by increasing the rake angle theta _A.

Since the set teeth C have the largest set width, the left and right runout is large, and chipping and chipping are apt to occur. Therefore, as shown in FIG. _C is reduced. Further, since the set tooth B has a relatively small set width, as shown in FIG. 9B, the rake angle θ _{B is changed} to the rake angle θ _A and the rake angle θ.
_C , but this rake angle θ _B is
It may be the same size as _{A (θ A ≧ θ B>} θ C).

Specifically, when the clearance angles α _A , α _B , and α _C are constant, the rake angle θ _A is 4 to 15 degrees, and particularly preferably 5 to 11 degrees. The rake angle θ _B is 3 degrees to 13 degrees, and particularly preferably 4 degrees to 10 degrees. Also, the rake angle θ _C
Is 0 to 11 degrees, and particularly preferably 0 to 7 degrees.

Although two kinds of widths are set as the set width as described above, one group may be composed of five or more teeth and three or more kinds of widths may be set. At this time, θ _A ≧ θ
Other set teeth C, D, E if the relation of _B is satisfied
In this case, the teeth with a larger set width may be provided so as to reduce the tip rake angle θ. That is, the rake angles of the other set teeth C, D, E... Are θ _C , θ _D , θ _E.
, And θ _A ≧ θ _B > (θ _C ≧ θ _D ≧ θ _E …
..).

The order of arrangement of the teeth can be arbitrarily set, but the teeth of the same set width must be paired on the left and right in the same group.

The case where the saw blade 9 described here has two types of tooth heights has been described, but the same applies to the case where there are two or more types of tooth heights.

Next, referring to FIGS. 7 (A), (B), (C) and FIGS. 10 (A), (B), (C), saw blades forming one group with five teeth 11 is shown. As shown in FIG. 7A, the tooth heights H _A and H _B of the straight teeth A and the set teeth B before the set is set out are substantially equal to the reference line KL, as shown in FIG. Although the set teeth C are the same, the tooth height H _C is low and different.

In this saw blade, one group has one straight tooth A, two set teeth B having a small set width, and two set teeth C having a large set width. Straight tooth A is as shown in FIG. 10 (A) for the linearity improved because the left and right deflection is small, have improved biting property by reducing the tooth angle beta _A.

Since the set tooth C has the largest set width, the left and right runout is large, and chipping and chipping are likely to occur. Therefore, in order to increase the tooth tip strength, as shown in FIG. _C is increased. In addition, set teeth B
Since the set width is relatively small, as shown in FIG. 10B, the tooth angle β _B is set between the tooth angles β _A and β _C , and this tooth angle β _B is set as the tooth angle. The size may be the same as β _A (β _C > β _B ≧ β _A ).

Specifically, the tooth angle β _{A is set} to 40 to 50 degrees, and particularly preferably 44 to 49 degrees. In tooth angle beta _B is 40 degrees to 55 degrees, in particular 45 to 50 degrees is preferable. Further, the tooth angle β _C is 45 to 75 degrees, and particularly preferably 48 to 67 degrees.

Although two kinds of widths are set as the set width as described above, three or more kinds of widths may be set by forming one group with five or more teeth. At this time, β _B ≧
If the relationship of β _A is satisfied, other set teeth C, D,
In E... (D, E... Are not shown), a tooth having a larger set width may be provided to increase the tooth angle β. That is, other set teeth C, D, the tooth angle beta _C of E ......, beta _D, when the _{β E ......, (β C ≧} β D ≧ β
_E ......)> may be a relationship of β _B ≧ β _A.

The order of arrangement of the teeth can be arbitrarily determined, but the teeth of the same set width must be in a pair in the same group.

The case where the saw blade 11 described here has two kinds of tooth heights has been described, but the same applies to the case where there are two or more kinds of tooth heights.

Next, FIGS. 11 (A), (B) and (C) show the tooth height H in FIGS. 7 (A), (B) and (C).
_The case where the arrangement of the set teeth _{C having} a low C is changed is shown.
12 (A), (B), (C) to FIG. 14 (A),
(B) and (C) show the above-mentioned FIGS. 8 (A), (B) and (C).
10 (A), 10 (B) and 10 (C) are shown. FIGS. 15A, 15B, and 15C show the case where the arrangement of the set teeth C having a low tooth height H _C in FIGS. 7A, 7B, and 7C is further changed. , FIG. 16 (A),
(B), (C)-FIG. 18 (A), (B), (C)
8 (A), (B), (C) to FIG. 10 (A)
Figures corresponding to (B) and (C) are shown.

From the above results, since the straight tooth A cuts without being swung right and left during cutting (cutting), it plays a guiding role for the other set teeth B, C,. Since the angle α _A is increased, the rake angle θ is increased, or the tooth angle β is set small, the biting property is improved and the straightness is improved. For this reason, high-precision cutting becomes possible.

The set teeth B, C,...
... reduces the clearance angle α and the rake angle θ, or the tooth angle β
The larger the depth of the teeth, the greater the strength of the tooth tip, and less likely to cause chipping or chipping even if it is swung right and left during cutting. For this reason, the life of the saw blade can be extended.

Referring to FIG. 19, here, for all the saw blades 1, 3, 5, 7, 9, and 11, the straight teeth A and the set teeth B, C,. Squeeze surface 13
And a predetermined height from the tip 17 of the straight teeth A or the set teeth B, C,...
In (a), a reference line KL is set at the position a). If the reference line KL crosses the straight tooth A or the set teeth B, C,..., X _A , or X _B , X _C ,..., The tooth tip strength is considered to be substantially proportional to the tooth width.

The rake angle θ, clearance angle α, and tooth angle β of each saw blade are, as shown in FIG. 19, θ + α + β = 90.
Degrees, the tooth width X is X = a ｛tan (β + θ)
−tan θ｝.

Accordingly, the tooth width X of the straight teeth A, the set teeth B having a small set width, and the other set teeth C, D,.
The large by setting _{X A ≦ X B <(X} C ≦ X D ≦ X E ......), set width is large set teeth B, C ...... tooth width X _B, X _C, the ...... As a result, the strength of the tooth tip is increased, and chipping and chipping are less likely to occur even if the tooth tip is swung right and left during cutting. For this reason, the life of the saw blade can be extended.

When the set width of the set tooth with the smallest set width is close to the set width of the other set teeth, the tooth width X
The more preferable to set the _{X A <X B ≦ (X} C ≦ X D ≦ X E ......).

Further, referring to FIG.
Is a straight line, but if the portion of the flank 21 close to the tooth tip 23 has an arc shape with a radius of curvature R, the tip clearance angle α is determined by the tangent line CL of the arc part of the tooth tip 23 and the tip line BL. Is considered exactly the same as the case shown in the above-described embodiment. At this time, the center position Z of the arc portion is the tangent C
It is located at a radius of curvature R from the tooth tip 23 on a straight line AL orthogonal to L.

Similarly, the tooth angle β is completely the same as that of the above embodiment by considering the angle between the tangent line CL and the rake face 19. Here, the case where the radius of curvature R of the arc portion becomes infinite corresponds to the case described above.

Accordingly, since the straight line AL connecting the center position Z and the tooth tip 23 is orthogonal to the tangent line CL, the relationship between the tooth angle β, the rake angle θ, and the clearance angle α is maintained as β + θ + α = 90 °. You can see that there is.

The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes.

[0089]

As described above, in the saw blade according to the first aspect of the present invention, a straight tooth and a plurality of set teeth are formed as a group to form a saw blade, and the tooth escape of the straight tooth with less left and right run-out is provided. Enlarging the angle to improve the bite-in property and increasing the left and right run-out For large set teeth, reduce the tip clearance angle to prevent chipping and chipping and extend the life of the saw blade Can be.

The larger the set width, the smaller the clearance angle of the tooth tip, so that the tooth angle increases and the rigidity increases. Therefore, the rigidity of the saw blade against the component force in the thickness direction at the time of cutting is increased, and the cutting accuracy is further improved.

In the saw blade according to the second aspect of the present invention, the straight blade and the plurality of set teeth are formed as a group to form a saw blade. In addition to the improvement, for the set teeth with a large set width where the right and left runout increases, the tip end rake angle is reduced to increase the tip end strength, prevent chipping and chipping, and extend the life of the saw blade. .

[0092] The larger the set width, the smaller the tooth tip rake angle is, so the tooth angle is increased and the rigidity is further increased. Therefore, the rigidity of the saw blade against the component force in the thickness direction at the time of cutting is increased, and the cutting accuracy is further improved.

In the saw blade according to the third aspect of the present invention, the saw blade is configured with a straight tooth and a plurality of set teeth as one group, and the tooth angle of the straight tooth with less left and right runout is reduced to improve the biting property. At the same time, with respect to the set teeth having a large set width in which the left and right run-out becomes large, the tooth angle is increased by increasing the tooth angle, thereby preventing chipping or chipping and extending the life of the saw blade.

The set teeth having a larger set width have a larger tooth angle, and therefore have higher rigidity. Therefore, the rigidity of the saw blade against the component force in the thickness direction at the time of cutting is increased, and the cutting accuracy is further improved.

In the saw blade according to the fourth aspect of the present invention, a straight tooth and a plurality of set teeth are formed as a group to form a saw blade, and the bite clearance angle of the straight tooth with less left and right runout is increased to improve the biteability. can do. Further, with respect to a set tooth having a large set width in which the right and left runout becomes large, the tip clearance angle is reduced to prevent chipping and chipping, thereby extending the life of the saw blade. In addition, since the succeeding tooth having a tooth height lower than the tooth height of the preceding tooth further expands the cutting portion cut by the preceding tooth, the straightness is improved and high-precision cutting becomes possible.

In the saw blade according to the fifth aspect of the present invention, the saw blade is configured with the straight teeth and the plurality of set teeth as one group, and the tooth tip squeeze angle of the straight teeth with less left and right run-out is increased to improve the biteability. can do. Further, with respect to a set tooth having a large set width in which the right and left run-out becomes large, the tip tip rake angle can be reduced to prevent chipping and chipping, thereby extending the life of the saw blade. In addition, since the succeeding tooth having a tooth height lower than the tooth height of the preceding tooth further expands the cutting portion cut by the preceding tooth, the straightness is improved and high-precision cutting becomes possible.

In the saw blade according to the sixth aspect of the present invention, the saw blade is formed by grouping the straight teeth and the plurality of set teeth as one group, and the tooth angle of the straight teeth with less left and right runout is reduced to improve the biteability. Can be. In addition, for a set tooth having a large set width in which the right and left run-out becomes large, by increasing the tooth angle, chipping and chipping can be prevented, and the life of the saw blade can be extended. In addition, since the succeeding tooth having a tooth height lower than the tooth height of the preceding tooth further expands the cutting portion cut by the preceding tooth, the straightness is improved and high-precision cutting becomes possible.

[0098] In the saw blade according to the seventh aspect of the present invention, it is possible to improve the bite ease by making the tip clearance angle of a straight tooth with a small right and left runout larger than the clearance angle of the set tooth with the smallest set width. it can. Further, since the right and left runout increases as the set width increases, chipping and chipping can be prevented by decreasing the clearance angle of the tooth tip as the set width increases.

In the saw blade according to the eighth aspect of the present invention, the bite angle of the tooth tip of the straight tooth with less left and right run-out can be made larger than that of the set tooth with the smallest set width, thereby improving the biting property. Further, since the right and left run-out becomes larger as the set width becomes larger, the tip end skewing angle is made smaller as the set width becomes larger, thereby increasing the tip end strength and preventing chipping and chipping.

In the saw blade according to the ninth aspect of the present invention, the bite angle of the straight tooth with less left and right runout can be made smaller than the tooth angle of the set tooth with the smallest set width, thereby improving the biteability. In addition, since the right and left deflection increases as the set width increases, the tooth tip strength is increased by increasing the tooth angle as the set width increases, thereby preventing chipping and chipping.

In the saw blade according to the tenth aspect of the invention, the tooth width is increased by increasing the tooth width of a set tooth having a large set width in which the right and left runout is greater than the tooth width of a straight tooth having a small left and right runout. As a result, chipping and chipping can be prevented.

The saw blade according to the eleventh aspect of the present invention is effective when the set width of the set tooth having the smallest set width is close to the set width of the other set teeth. Therefore,
The tooth width of straight teeth with less left and right run-out is minimized to improve biteability, and by increasing the width of set teeth with large left-right run-out, tip strength is increased to increase chipping and chipping. Can be prevented.

[Brief description of the drawings]

FIGS. 1A, 1B, and 1C are enlarged views showing tooth tips of a saw blade according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a relationship among a clearance angle, a tooth angle, and a rake angle at a tooth tip.

FIG. 3 is an explanatory diagram showing a relationship among a clearance angle, a tooth angle, a rake angle, and tooth tip strength and biteability.

FIG. 4 is an enlarged view showing a relationship among a clearance angle, a tooth angle, and a rake angle at a tooth tip of a saw blade.

FIG. 5 is an enlarged view showing a relationship between a clearance angle, a tooth angle, and a rake angle at a tooth tip of a saw blade.

FIG. 6 is an enlarged view showing a relationship among a clearance angle, a tooth angle, and a rake angle at a tooth tip of a saw blade.

FIGS. 7A, 7B, and 7C are enlarged views showing tooth tips of a saw blade according to a second embodiment of the present invention.

FIG. 8 is an enlarged view showing a relationship between a clearance angle, a tooth angle, and a rake angle at a tooth tip of a saw blade.

FIG. 9 is an enlarged view showing a relationship among a clearance angle, a tooth angle, and a rake angle at a tooth tip of a saw blade.

FIG. 10 is an enlarged view showing the relationship among a clearance angle, a tooth angle, and a rake angle at the tooth tip of the saw blade.

FIGS. 11A, 11B, and 11C are enlarged views showing tooth tips of a saw blade according to another embodiment of the present invention.

FIG. 12 is an enlarged view showing a relationship between a clearance angle, a tooth angle, and a rake angle at a tooth tip of a saw blade.

FIG. 13 is an enlarged view showing a relationship among a clearance angle, a tooth angle, and a rake angle at a tooth tip of a saw blade.

FIG. 14 is an enlarged view showing a relationship among a clearance angle, a tooth angle, and a rake angle at a tooth tip of a saw blade.

FIGS. 15A, 15B, and 15C are enlarged views showing tooth tips of a saw blade according to another embodiment of the present invention.

FIG. 16 is an enlarged view showing a relationship among a clearance angle, a tooth angle, and a rake angle at a tooth tip of a saw blade.

FIG. 17 is an enlarged view showing a relationship among a clearance angle, a tooth angle, and a rake angle at the tooth tip of the saw blade.

FIG. 18 is an enlarged view showing a relationship among a clearance angle, a tooth angle, and a rake angle at the tooth tip of the saw blade.

FIG. 19 is an enlarged view showing a relationship among a clearance angle, a tooth angle, and a rake angle at a tooth tip of a saw blade.

FIG. 20 is an explanatory diagram showing a relationship among a clearance angle, a tooth angle, and a rake angle when a flank of a tooth tip is formed in an arc shape.

[Explanation of symbols]

 1, 3, 5, 7, 9, 11 Saw blade A Straight teeth B, C, D ... Set teeth H Tooth height α Tooth clearance angle β Tooth angle θ Tooth edge squeeze angle W Workpiece

Claims (11)

[Claims] 1. A saw blade having at least one straight tooth and a plurality of set teeth bent in the left-right direction as a group, wherein a plurality of set widths of the plurality of set teeth are provided. The tip clearance angle of the straight teeth is equal to or greater than the tip clearance angle of the smallest set tooth of the set width,
A saw blade characterized in that a set tooth having a larger set width has a smaller tip clearance angle. 2. A saw blade having at least one straight tooth and a plurality of set teeth bent in the left-right direction as a group, wherein a plurality of set widths of the plurality of set teeth are provided, A saw blade characterized in that the tooth tip rake angle of the straight tooth is equal to or larger than the tooth tip rake angle of the set tooth having the smallest set width, and the tip end rake angle is smaller for set teeth having a larger set width. 3. A saw blade having at least one straight tooth and a plurality of set teeth bent in the left-right direction as a group, wherein a plurality of set widths of the plurality of set teeth are provided, A saw blade characterized in that the tooth angle of the straight teeth is equal to or smaller than the tooth angle of the set tooth having the smallest set width, and the set angle is larger for set teeth having a larger set width. 4. A group comprising a plurality of leading teeth for performing cutting prior to cutting of a workpiece and a plurality of trailing teeth for expanding a cut portion cut by the leading teeth as a group. The teeth have at least one straight tooth and at least one pair of set teeth bent in each of the left and right directions, the trailing teeth have at least one pair of set teeth bent in each of the left and right directions, and the tooth height dimension of the preceding tooth Is a saw blade that is larger than the tooth height dimension of the following tooth and the set width of the following tooth is larger than the set width of the preceding tooth, the tip clearance angle of the straight tooth is α _A , the tooth tip relief angle set teeth contained alpha _B, when formed into a tooth tip relief angle alpha _C set teeth included in the subsequent tooth, the saw blade, characterized in that the α _a ≧ α _B> α _C . 5. A method according to claim 1, further comprising a group of a plurality of leading teeth for performing cutting prior to the cutting of the workpiece, and a plurality of trailing teeth for expanding a cutting portion cut by the leading teeth. The teeth have at least one straight tooth and at least one pair of set teeth bent in each of the left and right directions, the trailing teeth have at least one pair of set teeth bent in each of the left and right directions, and the tooth height dimension of the preceding tooth Is a saw blade that is larger than the tooth height dimension of the following tooth and the set width of the following tooth is larger than the set width of the preceding tooth, the tip rake angle of the straight tooth is θ _A , the tooth tip rake angle set teeth contained theta _B, the tooth tip rake angle set teeth included in the subsequent tooth when the theta _C, saws, characterized in that the θ _a ≧ θ _B> θ _C blade. 6. A group comprising a plurality of leading teeth for cutting prior to cutting of a workpiece and a plurality of trailing teeth for expanding a cut portion cut by the leading teeth as one group, The teeth have at least one straight tooth and at least one pair of set teeth bent in each of the left and right directions, the trailing teeth have at least one pair of set teeth bent in each of the left and right directions, and the tooth height dimension of the preceding tooth Is a saw blade that is larger than the tooth height dimension of the following tooth and the set width of the following tooth is larger than the set width of the preceding tooth, and the tooth angle of the straight tooth is β _A , which is included in the preceding tooth. the tooth angle of the set teeth beta _B, the tooth angle set teeth included in the subsequent tooth when the beta _C, the saw blade, which is a _{β C> β B ≧ β a} . 7. A saw blade having at least one straight tooth and a plurality of set teeth bent in the left-right direction as a group, wherein a plurality of set widths of the plurality of set teeth are provided, When the clearance angle of the tip of the straight tooth is α _A , the clearance angle of the tip of the shortest set tooth is α _B , and the clearance angle of the tip of other set teeth is α _C , α _D , α _E … And α
_A ≧ _{α B>} saw blade, characterized in that the _{(α C ≧ α D ≧ α} E ≧ ......). 8. A saw blade having at least one straight tooth and a plurality of set teeth bent in the left-right direction as a group, wherein a plurality of set widths of the plurality of set teeth are provided. When the tip rake angle of the straight tooth is θA, the tip rake angle of the set tooth having the smallest set width is θ _B , and the tip rake angles of the other set teeth are θ _C , θ _D , θ _E. , saw blade, which is a _{θ a ≧ θ B> (θ} C ≧ θ D ≧ θ E ≧ ......). 9. A saw blade having at least one straight tooth and a plurality of set teeth bent in the left-right direction as a group, wherein a plurality of set widths of the plurality of set teeth are provided. When the tooth angle of the straight tooth is β _A , the tooth angle of the set tooth with the smallest set width is β _B , and the tooth angles of the other set teeth are β _C , β _D , β _E …, (β _C ≧ β _D ≧ β
Saw blade, characterized in that the _{E ≧ ......)> β B ≧} β A. 10. A group comprising at least one straight tooth and a plurality of set teeth each bent in the left-right direction,
A saw blade provided with a plurality of set widths of the plurality of set teeth, wherein the straight teeth and the straight portions of the rake face and flank of the set teeth have a predetermined height from the tip of the straight teeth or set teeth. straight teeth tooth width X _a of the reference line position set to be the smallest tooth width set teeth having set width and X _B, the tooth width of the other set teeth _{X C, X D, X E} ......
When _{a, X A ≦ X B <(} X C ≦ X D ≦ X E ......)
A saw blade, characterized in that: 11. A group having at least one straight tooth and a plurality of set teeth bent in the left-right direction, respectively.
A saw blade provided with a plurality of set widths of the plurality of set teeth, wherein the straight teeth and the straight portions of the rake face and flank of the set teeth have a predetermined height from the tip of the straight teeth or set teeth. straight teeth tooth width X _a of the reference line position set to be the smallest tooth width set teeth having set width and X _B, the tooth width of the other set teeth _{X C, X D, X E} ......
When _{a, X A <X B ≦ (} X C ≦ X D ≦ X E ......)
A saw blade, characterized in that: