JP3944800B2 - Manufacturing method of saw blade of hand saw - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a saw blade.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, when cutting the workpiece with a hand saw, the tip of the saw blade is alternately turned left and right alternately to the saw blade in order to reduce the friction between the saw blade and the workpiece and lighten the sawing. As a result of the sorting, the claws are thickened so that the thickness of the claws is wider than the thickness of the back, and the abdomen of the saw blade is made thinner than the back.
[0003]
As a method of performing the above-mentioned processing with a set, a hardened steel strip is sandwiched between the rotating grindstones using a polishing means in which a pair of roughing grindstones and a pair of finishing grindstones are sequentially arranged. A saw blade manufacturing method is known in which polishing is performed simultaneously from both sides, and the entire back portion, abdomen portion, and saw blade portion of the saw blade are cut.
[0004]
However, in the method in which the entire surface of the back portion, the abdomen portion and the saw tooth portion of the saw blade are cut by the polishing means, the steel plate member of the material uses a thick hardened steel strip having a thickness of at least the thickness of the clam, so that the material cost is reduced. In the back and abdomen, the thick hardened steel strip is polished to the back thickness and the abdominal thickness, so the amount of polishing becomes very large, most of the hardened steel strip is wasted, and rough polishing and Two steps of polishing of final polishing are required, which requires a lot of processing and takes a long time.
[0005]
In addition, as a problem related to the quality of the saw blade, a large amount of hardened steel strip is polished, which generates a large amount of frictional heat and simultaneously inhibits the diffusion of heat generated by polishing the front and back of the hardened steel strip at the same time. As a result, a part of extremely high temperature will be created, and the hardened steel strip will be baked back and the material will become brittle. In addition, if both sides of the hardened steel strip are sandwiched by a rotating grindstone and polished, the amount of polishing is uneven due to deformation of the hardened steel strip, runout of the rotating grindstone, wear, or differences in the material of the rotating grindstone. It is difficult to grind the hardened steel strip symmetrically with the front and back, and when the saw blade is left with distortion, the finish of the cut surface when cutting the material to be cut, Problems such as heavy sawing operation due to friction Occur it was.
[0006]
Therefore, the applicant of the present invention has difficulty in reducing the material cost by using a thick hardened steel strip, the amount of polishing of the hardened steel strip becomes very large, and most of the material is wasted, a steel plate member It requires two stages of polishing, rough polishing and finish polishing, which takes time and requires a long processing time, and the heat generated by a large amount of polishing adversely affects the hardened steel plate. Japanese Patent Application No. 9-291083 has filed a method for manufacturing a saw blade that solves the problem.
[0007]
In other words, a rolled steel plate is punched into an outer contour shape of a saw blade to form a punched first base, and a sawtooth formation corresponding to a sawtooth formed conspicuously in a subsequent process is formed on an edge forming the sawtooth of the punched first base A first step of forming a part and applying a clam to form a first substrate with a clam;
The rotating grindstone is composed of a conveying means for fixing and transferring the first substrate with the claws and a rotating grindstone rotated by a spindle, and a polishing means capable of setting the rotation axis of the rotating grindstone to make an acute angle with respect to the transfer line. The peripheral surface or a part thereof is brought into contact with the abdomen formation surface of the first base with clams divided into the back part and the abdomen formation part continuous with the virtual line, and the peripheral edge of the grindstone is the boundary between the back part and the abdomen. In the state where the fillet part is formed in the part and the claws are secured, only the abdominal part forming parts on both sides of the first base with the claws are polished on each side or simultaneously on both sides to form a stealing part as an abdomen. Aligning clams, forming a second polishing substrate with a clad thickness width of the sawtooth forming portion larger than the back thickness of the back portion; and
A saw blade manufacturing method comprising a third step of forming a first saw blade, a second saw blade, or a saw tooth portion in which these saw teeth are mixed by conspicuous means in the saw blade forming portion, and forming a saw blade.
[0008]
According to the saw blade manufacturing method, the thickness of the rolled steel sheet as a material only needs to be thick, and the parts to be polished and finished are only the abdomen of the saw blade and part of the saw blade formation. Compared with the manufacturing method in which the entire saw blade is formed by polishing, the amount of polishing of the material is very small, the waste of the material can be reduced, and the heat generated by the polishing is also small, which has little effect on the rolled steel plate. Since the polishing method is simple and high-precision polishing can be performed without distortion of the saw blade, the number of manufacturing steps is reduced, and the number of manufacturing steps can be reduced, thereby reducing the manufacturing cost.
[0009]
Therefore, the present invention can reduce the amount of polishing of the material to reduce the waste of the material, and the heat generated by the polishing is small and has little influence on the material, the polishing method is simple and the accuracy with which the saw blade is not distorted. Since the high polishing can be performed, the manufacturing process is reduced, the manufacturing process is reduced and the manufacturing cost can be reduced while maintaining the effect of reducing the manufacturing cost. An object of the present invention is to provide a saw blade manufacturing method that can manufacture a saw blade without distortion at a low cost.
[0010]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-mentioned problems, and has a saw blade corresponding to a saw blade formed conspicuously in a subsequent process at an edge forming a saw blade of a hardened steel strip which has been smoothly corrected from a coiled state. The first step of forming the forming part and applying the clam to make the clad steel strip,
It comprises a transfer means for transferring the clad-attached steel strip in a state in which the claws are secured, and a pair of polishing devices arranged alternately along the transfer line, each consisting of a rotating grindstone rotated by a spindle and a bed, Each rotating grindstone fixed to face the bed so as to sandwich the clad steel strip can be set so that the rotary shaft makes an acute angle with respect to the transfer line so that both sides of the clad steel strip can be polished symmetrically. In addition, the peripheral surface of the rotating grindstone or a part thereof is brought into contact with the abdomen forming surface continuous with the back in a state where the claws are secured, and the peripheral edge of the grindstone is a fillet portion at the boundary between the back and the abdomen forming surface. The abdomen forming surface of both sides of the clad steel strip is continuously polished to form an abdomen and align the clams, and the serrated thickness width of the sawtooth forming part is larger than the back thickness of the back part Formed polished steel strip A second step that,
A third step of forming a sawtooth portion by forming a first sawtooth or a second sawtooth or a mixed sawtooth portion by conspicuous means in the sawtooth forming portion,
A saw blade manufacturing method comprising a fourth step of manufacturing the saw blade by punching the sawtooth steel strip into a saw blade shape is basically used.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
And [Example]
Example 1
The manufacturing method of the folding body of the folding type hand saw according to the first embodiment of the present invention will be described with reference to the drawings. The saw body (1) of the present embodiment has a total length of 300 mm and a maximum saw width of 40 mm. 2 is a schematic cross-sectional view of a saw blade, FIG. 3 is a front view of a state where a clad steel strip (1a) is continuously polished, and FIG. 4 is a view from the direction F in FIG. FIG. 5 is a partially enlarged view of the sawtooth portion. First, as a first step, the sawtooth portion is formed at the edge where the sawtooth is formed in the post-process of the hardened steel strip (M) having a thickness of 0.8 mm. The sawtooth forming part (2c) that forms the basis of (2) is formed by pressing means, and at the same time, the sawtooth forming part (2c) is alternately bent so that it is distributed to the left and right with respect to the hardened steel strip (M). To give a clad steel strip (1a). The clam is an interval formed by an imaginary line connecting the tip of the serrated portion (2c) bent to the right side and an imaginary line connecting the tip of the serrated portion (2c) bent to the left side, i.e., the thickness of the set ( 2t) is slightly wider than the thickness of the hardened steel strip (M) to be 1.2 mm.
[0012]
Next, as a second step, the side of the clad steel strip (1a) and 20 mm from the tip of the sawtooth forming portion (2c) is used as the base line (L1), and the claws of the clad steel strip (1a) are formed. The abdomen (8) so as to be continuous with the sawtooth forming part (2c) and to secure the claws by polishing both side surfaces from the tip part of the part (2c) to the base line (L1) symmetrically by the polishing means described later. The polished steel strip (1b) is formed so that the clam thickness width (2t) is larger than the back thickness (7t) of the back portion (7).
[0013]
The shape of polishing (see FIGS. 1 and 2) is such that the abdominal part (8) has a constant abdominal thickness (8t) of 0.6 mm by grinding the abdominal part (8) to the left and right evenly. In the vicinity of the sawtooth forming portion (2c), the amount of polishing is reduced to smoothly connect the sawtooth forming portion (2c) and the abdomen (8), and the tip portion is only slightly polished and the sawtooth forming portion ( Align the claws of 2c) and form a fillet (7a) at the boundary between the back (7) and the abdomen (8) to make it continue smoothly. Since the polishing amount and the polishing portion are greatly related to the strength of the finished saw blade (1) against bending and twisting, the strength of the saw blade (1) can be adjusted by increasing or decreasing the polishing amount.
[0014]
As shown in FIG. 3, the polishing means used in the second step is a pair of polishing apparatuses comprising a rotating grindstone (11) rotated by a spindle (12) and a bed (10) supporting a clad steel strip (1a). And a clad steel strip (1a) comprising transfer means for transporting in the direction of the arrow using a rotating roller (13), and the bed (10) is placed in contact with both surfaces of the clad steel strip (1a). It is continuously arranged parallel to the transfer direction on the front and back of the clad steel strip (1a).
[0015]
The rotating grindstones (11) fixed opposite to the bed (10) so as to secure a gap so as to sandwich the clad steel strip (1a) are rotated by the spindles (12) and attached to the claws. Positioned so that both surfaces of the steel strip (1a) can be polished symmetrically, the rotational axis of the rotating grindstone (11) is parallel to the bed (10), and the angle to the transfer direction of the clad steel strip (1a) is 60 The angle is set to 80 degrees.
[0016]
Then, the direction of rotation of each rotating grindstone (11) is the transfer direction of the clad steel strip (1a), and the clad steel strip (1a) is transported to the gap at a transport speed slower than the peripheral speed of the rotary grindstone (11). The abdomen (8), fillet (7a) and clams are continuously polished.
[0017]
As described above, the bed (10) is continuously arranged in parallel to the transfer direction on the front and back of the clad steel strip (1a) so as to abut both surfaces of the clad steel strip (1a). By securing each rotary grindstone (11) by securing a gap with the bed (10) so as to sandwich the steel strip (1a), the time between the front surface polishing step and the rear surface polishing step, By creating a spatial interval, the heat generated when polishing one side of the clad steel strip (1a) is cooled using air as a medium before polishing the other side. The temperature of the steel strip (1a) can be prevented, and the temperature of the clad steel strip (1a) is kept low by synergistic effects with the small amount of polishing without adverse effects such as reversion of baking. Therefore, it is possible to manufacture a saw blade (1) with good quality.
[0018]
In addition, since the clad steel strip (1a) is sandwiched between the bed (10) and the rotating whetstone (12) and polished on each side, the dimensional accuracy of the polishing amount can be easily secured, and the wobble and wear of the rotating whetstone etc. Polishing error can be reduced, and polishing without distortion can be performed continuously.
[0019]
The rotating grindstone (11) has a shape in which a truncated conical whetstone portion (11b) having a bottom diameter of 150 mm is continuously formed on a cylindrical grindstone portion (11a) having a diameter of 150 mm and a thickness of 12 mm. 11e) is smoothly continuous, and the shape of the conical whetstone portion (11b) is such that when the abdomen (8) of the clad steel strip (1a) is polished, the peripheral surface (11f) of the conical whetstone is slightly serrated. The tip of (2c) is set to be polished, and the rotating shaft of the rotating grindstone (11) is parallel to the side surface of the clad steel strip (1a) supported by the bed (10), and The angle θ with respect to the transfer line which is a virtual line parallel to the transfer direction of the steel strip (1a) is set to be 70 degrees. When the polishing means is viewed from the direction F, as shown in FIG. 4, the projection of the peripheral edge (11c) of the grindstone is elliptical, and the peripheral surface of the cylindrical grindstone (11d) is parallel to the side surface of the clad steel strip (1a). The continuous portion (11e) also has a smooth curve.
[0020]
In the polishing process, first, the sawtooth forming portion (2c) of the clad steel strip (1a) is made parallel to the transfer line of the bed (10), and the peripheral edge of the grindstone surface closest to the bed (10) ( 11c) Transfer the clad steel strip (1a) while regulating the vertical runout of the clad steel strip (1a) with the roller (14) so that the upper point is on the extension of the base line (L1). The rotating grindstone (11) is brought into contact with the side surface of the clad steel strip (1a) supported by the bed (10), and the side surface of the clad steel strip (1a) is polished to form a stealing portion (9). Next, the back surface is also continuously polished to make the abdominal thickness (8t) a constant thickness of 0.6mm, the claws on both sides are neatly aligned, the clam thickness width (2t) is secured to about 1.2mm, and the back thickness Since (7t) does not polish the back portion (7), a polished steel strip (1b) having a thickness of 0.8 mm with the thickness of the hardened steel strip (M) is obtained.
[0021]
According to the above polishing means, the rotary shaft of the rotating grindstone (11) is positioned and fixed at an angle θ with respect to the transfer line of the bed (10) of 70 degrees, and the clad steel strip (1a) is surely prevented from moving in the vertical direction. By restricting and supporting the sawtooth forming part (2c) so as to be parallel to the transfer direction, there is no distortion of the clad steel strip (1a) during polishing (rotation to the abdomen (8)) Grinding wheel (11) (thickness 12 mm) x sin 70 degree width can be polished accurately and easily, and the boundary from the abdomen (8) to the back (7) When the thickness is 0.2 mm, the fillet portion (7a) is formed smoothly with the shape of the projection of the peripheral edge portion (11c) of the grindstone over a width of about 1.9 mm, The amount of polishing of the sawtooth forming portion (2c) decreases toward the tip, and the tip of the sawtooth forming portion (2c) is assembled by slightly polishing the tip. It can be matched. Furthermore, since the amount of polishing in the polishing process is very small, it is only necessary to use a grinding wheel for finishing, and since it is easy to ensure the processing accuracy, the polished surface can be finished extremely smoothly and the processing time is also short. Therefore, the heat generated by polishing is small and the influence on the clad steel strip (1a) is small.
[0022]
The polishing means is not limited to the above embodiment, and the shape, dimensions, and angle θ formed by the transfer line between the rotating shaft and the bed (10) are the saw blade (1) to be manufactured. Needless to say, the shape can be changed according to the width of the abdomen (8), etc., for example, because it is a part that forms the fillet part (7a), chamfering is formed at the peripheral edge (11c) of the grindstone, The angle θ is increased by setting the generatrix of the circumferential surface of the conical whetstone (11f) to an arc shape, or the angle formed by the rotating shaft and the steel strip with claws (1a) is set to an arbitrary direction by using the whetstone shape as a truncated cone shape. It may be.
[0023]
However, if the angle θ between the rotation axis and the transfer line is too large (about 80 degrees or more), the fillet portion (7a) becomes small, and the streak due to the rotating grindstone (11) is sawn on the surface of the abdomen (8). Since it is formed slightly coarsely in parallel with the longitudinal direction of the body (1), it is not preferable for ensuring the strength of the saw blade in the bending direction.
[0024]
Conversely, if the angle θ is reduced (about 60 degrees or less), the width of the fillet part (7a) becomes wider, and the difference in thickness between the back part (7) and the abdominal part (8) is reduced. In this case, the friction with the material to be cut increases and the sawing operation becomes heavy, and the width of the abdomen (8) becomes narrower than the thickness of the rotating grindstone (11), so that efficient polishing cannot be performed and polishing is performed once. In order to align the abdomen (8), fillet (7a) and clams, it is necessary to use a thick rotating grindstone (11).
[0025]
Therefore, if the angle formed by the rotation axis of the rotating grindstone (11) with respect to the transfer line is set in the range of about 60 to 80 degrees, the lines formed on the surface of the abdomen (8) become sufficiently fine, and the strength of the saw blade in the bending direction is increased. It is preferable because the width of the fillet portion (7a) can be made moderate and efficient polishing can be performed.
[0026]
Next, as the third step, the sawtooth portion (2c) is formed on the sawtooth forming portion (2c) of the polished steel strip (1b) by the existing sharpening means to form a sawtoothed steel strip (1c), and then as the fourth step. The saw blade (1) is completed by punching it into a saw blade shape with a total length of 300mm and a maximum height of 40mm from the sawtooth steel strip (1c).
[0027]
The shape of the sawtooth portion (2) will be described. As shown in FIG. 5, the sawtooth portion (2) is composed of a first sawtooth (2a) and a second sawtooth (2b), and each first sawtooth (2a) As shown in the A section, the lower blade (3) on the sawing direction (D) side and the saw feed direction (E) side of the surface opposite to the direction bent by the set-up (hereinafter referred to as the “claw inner surface”) The upper blade (4) is formed at the tip, and the upper blade (4) is formed at the tip, and the upper eye (5) is formed so as to intersect with the lower blade, and the tip at which the lower blade (3) and the upper eye (5) intersect Forms the first heaven (6a). In other words, the first saw blade (2a) should have claws formed in the direction opposite to the surface (hereinafter referred to as "tooth surface") on which the lower blade (3) or the like is formed (hereinafter referred to as "tooth surface"). Thus, each first ceiling (6a) constitutes the widest portion of the sawtooth portion (2), that is, the clam thickness width (2t).
[0028]
Next, the second saw blade (2b) is not formed with the lower blade (3) on the sawing direction (D) side as shown in the B section, and is a surface in the direction bent by the claws (hereinafter referred to as “ The upper blade (4) is formed on the saw feed direction (E) side of the clam outer surface), and the upper eye (5) is formed on the tip, and the tip of the upper eye (5) is the second top (6b). Is forming. Therefore, the second saw blade (2b) is bent in the surface on which the upper blade (4) and the like are formed, that is, in the direction of the tooth surface, to form a set, but to the left and right of each second ceiling (6b) The opening width is narrower than the opening width of the first ceiling (6a).
[0029]
The first sawtooth (2a) and second sawtooth (2b) are arranged in such a way that the tooth surface and the back of the first sawtooth (2a) of the fourth eye alternately turn to the left and right of the saw blade (1). The second saw blade (2b) is formed at a glance every fourth of the first saw blade (2a), and the second saw blade (2b) also has the tooth surface and the back of the teeth alternately alternately facing left and right. Are arranged as follows.
[0030]
In addition, when the saw blade (1) is viewed from the C direction, the first heaven (6a) and the second heaven (6b) do not overlap, and the first heaven (6a) and the second heaven in the width direction of the clam thickness width (2t). Four heavens (6b) are in a line. In other words, there are two first heavens (6a) on the left and right sides, two second heavens (6b) are located between them, and the first heavens (6a) and the second heavens (6b) are arranged in the width direction. It becomes composition.
[0031]
Therefore, if there are only two first heavens (6a) on the left and right, a mountain with a triangular cross-section remains at the center of the bottom of the pull of the material to be cut. The pull is heavy and the sharpness is worse, but by arranging four first heavens (6a) and second heavens (6b), there is no mountain with a triangular cross section in the center of the bottom of the pull, In the cutting operation, the operation becomes lighter and the sharpness is improved.
[0032]
The saw according to the present invention is not limited to the embodiment described above, and is adapted to the use of the hand saw such as the height of the back portion (7), the height of the saw blade (1), and the degree of formation of the claws. Dimension and shape can be freely processed, such as forming a sawtooth part (2) that combines various sawtooth shapes, which enables waist strength and tooth shape according to the purpose of the hand saw Needless to say, is obtained.
[0033]
【The invention's effect】
According to the method of manufacturing the saw blade of the hand saw according to the present invention described above, a temporal and spatial interval is generated between the front surface polishing step and the rear surface polishing step, and the clad steel strip (1a) The heat generated when polishing one side of the steel is cooled using air as the medium before polishing the other side, so that the temperature rise of the clad steel strip (1a) can be prevented, and the baking is restored. Thus, the saw blade (1) with good quality can be manufactured by maintaining the temperature of the clad steel strip (1a) at a low temperature by a synergistic effect with a small amount of polishing.
[0034]
In addition, because the clad steel strip (1a) is sandwiched between the bed (10) and the rotating grindstone (12) and polished on each side, the dimensional accuracy of the polishing amount is ensured, and the rotating grindstone is free from vibration and wear. An error in the amount of polishing can be reduced, and the manufacturing efficiency of the saw blade (1) can be improved by performing polishing without distortion continuously.
[0035]
Furthermore, the thickness of the hardened steel strip (M) used as a material only needs to be a thickness of the back thickness (7 tons), and since a thin hardened steel strip (M) can be used, the material cost can be reduced. Since the parts to be polished and finished are only the abdomen (8) of the saw blade (1) and part of the saw blade formation (2c), the material of the saw blade (1) is compared with the manufacturing method in which the entire saw blade (1) is formed by polishing. The amount of polishing is very small, the waste of material can be reduced, and the polishing method is simple and the saw blade (1) can be polished without distortion, so the number of manufacturing steps is reduced and the number of manufacturing steps is reduced. Manufacturing cost can be reduced and economic efficiency can be improved.
[0036]
Furthermore, since the rotating wheel (11) has a rotating shaft set at an acute angle with respect to the transfer line of the clad steel strip (1a), it is polished continuously at the boundary between the back (7) and the abdomen (8). The fillet portion (7a) can be formed in an improved manner, the durability of the saw blade (1) against bending is improved, and the lines formed in the saw blade portion (2) by polishing become sufficiently fine, so that the saw blade portion (2) Can prevent stress concentration in the periphery of the wire, secure strength in the bending direction and produce a saw with few sawtooth defects, and can provide a clean clam with uniform tooth tips. The cutting line of the cutting material can be finished neatly, and resistance to friction with the material to be cut can be reduced, and the saw can be lightened.
[0037]
The amount of polishing of the material can be reduced by the above, the waste of the material can be reduced, the heat generated by the polishing is small and the influence on the material is small, the polishing method is simple and the saw blade is not distorted and has high accuracy. Since polishing can be performed, the number of manufacturing steps is reduced, the number of manufacturing steps can be reduced, and the manufacturing cost can be reduced while maintaining the effect of increasing the manufacturing efficiency. It is possible to provide a method of manufacturing a saw blade that can manufacture a saw blade with no saw at low cost.
[Brief description of the drawings]
FIG. 1 is a procedure of a saw blade manufacturing process.
FIG. 2 is a schematic cross-sectional view of a saw blade.
FIG. 3 is a front view showing a state where a clad steel strip is polished on one side.
4 is a side view of FIG. 3 viewed from the direction F. FIG.
FIG. 5 is a partially enlarged view of a sawtooth portion of the hand saw according to the first embodiment.
[Explanation of symbols]
(1) saw blade
(1a) Steel strip with clams
(1b) Polished steel strip
(1c) Sawtooth steel strip
(2) Sawtooth part
(2a) First saw blade
(2b) Second saw blade
(2c) Sawtooth forming part
(2t) Clam thickness
(3) Lower blade
(4) Upper blade
(5) Upper eyes
(6a) First heaven
(6b) Second heaven
(7) Back
(7a) Fillet
(7t) Height
(8) Abdomen
(8t) Abdominal thickness
(9) Stealing part
(10) Bed
(11) Rotary grinding wheel
(11a) Cylindrical grinding wheel
(11b) Conical whetstone
(11c) Wheel peripheral edge
(11d) Cylindrical grinding wheel circumference
(11e) Continuous part
(11f) Conical whetstone circumference
(12) Spindle
(13) Rotating roller
(14) Roller
(D) Sawing direction
(E) Saw feed direction
(L1) Baseline
(L2) Tooth height center line
(M) Hardened steel strip

Claims (1)

On the edge that forms the sawtooth of the hardened steel strip (M) that has been straightened from the coiled state, a sawtooth forming portion (2c) corresponding to the sawtooth that is conspicuously formed in the subsequent process is formed and the claws are applied. The first step with clam steel strip (1a),
Transfer means for transferring the clad steel strip (1a) in a state where the claws are secured, a rotating grindstone (11) and a bed (10) that are alternately arranged along the transfer line and are rotated by a spindle (12). Each of the rotating grindstones (11) fixed to face the bed (10) so as to sandwich the clad steel strip (1a) is composed of a pair of polishing devices consisting of the clad steel strip (1a) The rotating shaft can be set to form an acute angle with respect to the transfer line so that both surfaces of the rotating wheel can be polished symmetrically, and the peripheral surface of the rotating grindstone (11) or a part thereof is formed as an abdomen continuous with the back portion (7). In the state where the claws are secured to the surface, the peripheral edge of the grindstone (11c) forms a fillet portion (7a) at the boundary between the back portion (7) and the abdomen forming surface, while the clad steel strip ( The abdomen forming surfaces on both side surfaces of 1a) are continuously polished to form an abdomen (8) and the claws are aligned, and the serrations of the sawtooth forming part (2c) A second step of forming a large and abrasive steel strip from SeAtsu (7t) of the saw width a (2t) back (7) (1b),
A first sawtooth (2a) or a second sawtooth (2b) or a sawtooth portion (2) in which these are mixed is formed by conspicuous means in the sawtooth forming portion (2c) to form a sawtoothed steel strip (1c) Third process,
A saw blade manufacturing method comprising a fourth step of punching the sawtooth steel strip (1c) into a saw blade shape to manufacture the saw blade (1).

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