JPH11188527A - Manufacture of blade of hand saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a saw blade of a hand saw having the uniform thickness and no distortion at low cost by decreasing the material cost through a process of enabling continuos polishing of a hardened steel strip and decreasing the polishing amount in the polishing process, and by decreasing the manufacturing cost through a process of improving the manufacturing efficiency. SOLUTION: A manufacturing method of a saw blade of a hand saw is composed of a first process for applying tooth setting by forming a tooth forming body 2c on the edge of a hardened steel strip M into a tooth set steel strip 1a; a second process for continuously arranging respective rotational grinning wheels so fixed as to pinch the tooth set steel strip 1a and as to face a head in the transferring direction so as to symmetrically polish both surfaces of the tooth set steel strip 1a, polishing only the body parts of both side surfaces of the both set steel strip 1a in the set secured state, eliminating cut part, and for forming a polished steel strip 1b; a third process for forming a saw tooth part 2 on the saw tooth forming part 2c into a saw tooth provided steel strip 1c; and a fourth process for manufacturing a saw blade 1 by punching the saw tooth provided steel strip 1c into the saw blade shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a saw blade of a hand saw.

[0002]

2. Description of the Related Art Conventionally, in order to reduce the friction between a saw blade and a material to be cut when cutting the material to be cut with a manual saw, a saw has been conventionally used. The tip of the saw tooth is alternately distributed left and right on the body at a glance, and a set is made so that the set thickness width of the saw tooth portion is wider than the back portion, and the abdomen of the saw body is made thinner than the back portion.

[0003] As a method of performing the above-mentioned processing with a set, a hardened steel strip is polished with each rotary grindstone by using a polishing means in which a pair of rotary grindstones for roughing and a pair of rotary grindstones for finish are arranged in order. 2. Description of the Related Art There is known a method of manufacturing a saw body in which the back, abdomen, and saw teeth of the saw body are entirely ground by being nipped and polished simultaneously from both sides.

However, in the method of shaving the entire back, abdomen and sawtooth portion of the saw blade by a polishing means, a steel plate member made of a material uses a thick hardened steel strip having a thickness of at least the thickness of a clam. It is difficult to reduce the cost, and in the back and abdomen, the thick quenched steel strip is polished to the thickness of the back and belly, so the polishing amount becomes very large, and most of the quenched steel strip is wasted, Polishing in two stages of rough polishing and finish polishing is required, and the processing is time-consuming and requires a long processing time.

[0005] Further, as a problem related to the quality of the saw blade, a large amount of frictional heat is generated due to a large amount of polishing of the hardened steel strip, and heat generated due to simultaneous polishing of the front and back of the hardened steel strip is generated. In this way, the extremely high temperature is partially created, and the quenched steel strip returns to quenching in that part, and the material becomes brittle. There is a problem that spillage is easy to occur.Furthermore, if both sides of the quenched steel strip are polished while being sandwiched by a rotating grindstone, the amount of polishing due to deformation of the quenched steel strip, runout or wear of the rotating grindstone or difference in the material of the rotating grindstone It is difficult to grind the quenched steel strip symmetrically due to unevenness of the surface.If the steel strip is manufactured with distortion left, the finish of the cut surface when cutting the material to be cut will be deteriorated, Heavy sawing operation due to friction with material Problems such as that has occurred.

Therefore, the applicant of the present application has found that it is difficult to reduce the material cost by using a thick quenched steel strip, the polishing amount of the quenched steel strip is extremely large, and most of the material is wasted. , Two stages of polishing, rough polishing and finish polishing, are required for the steel plate member, which is troublesome 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 an application for a method of manufacturing a saw blade having a solution to these problems.

That is, a rolled steel plate is punched into a contour of a saw blade to form a punched first base, and the edge of the punched first base forming a saw tooth is made to correspond to a saw tooth to be prominently formed in a later step. A first step of forming a sawtooth forming portion and applying a set to make a first base with a set, a transfer means for fixing and transferring the first base with a set, and a rotating grindstone rotated by a spindle, By a polishing means that can set the rotation axis of the rotary grindstone so as to form an acute angle with respect to the transfer line, the peripheral surface of the rotary grindstone or a part thereof, the set with the first base with the set and the abdomen forming portion continuous with the back. In contact with the abdomen forming surface divided by the imaginary line, the peripheral edge of the grindstone forms a fillet at the boundary between the back and the abdomen, and in a state where a set is secured, both sides of the first base with the set Abdominal formation only A second step of forming a polished second substrate by polishing each or both surfaces simultaneously, forming a stolen portion and forming an abdomen and aligning the set, and setting the set thickness width of the sawtooth forming portion larger than the back thickness of the back portion. A third step of forming a first saw tooth, a second saw tooth, or a saw tooth portion in which the first saw tooth or the second saw tooth is mixed in the saw tooth forming portion with a sharpening means to form a saw blade;

According to the method for manufacturing a saw blade, the thickness of the rolled steel plate used as the material only needs to have a thickness of the back, and the portion to be polished and finished is only the abdomen of the saw blade and a part of the formation of the saw teeth. Therefore, compared with the manufacturing method in which the entire saw blade is formed by polishing, the amount of polishing of the material is extremely small, and the waste of the material can be reduced. Since there is little influence, the polishing method is simple, and high-precision polishing can be performed without causing distortion of the saw blade, the number of manufacturing steps is reduced, the number of manufacturing steps is reduced, and the manufacturing cost can be reduced.

Therefore, the present invention can reduce the amount of material polishing to reduce waste of the material, and generate a small amount of heat due to polishing, which has a small influence on the material. High-precision polishing that does not come out can reduce the number of manufacturing steps, reduce the number of steps in the manufacturing process, and reduce the manufacturing cost. It is an object of the present invention to provide a method for manufacturing a saw blade of a hand saw, which is uniform and has no distortion.

[0010]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a quenched steel strip having a serrated edge formed into a smooth shape from a coil state, and having an edge formed in a subsequent step. A first step of forming a sawtooth forming portion corresponding to the sawtooth to be formed and applying a set to form a steel strip with a set, a transfer means for transferring the steel strip with a set while securing the set, and a transfer line Each of the rotary whetstones, which are arranged alternately along the axis, are composed of a pair of polishing devices each including a rotary whetstone rotated by a spindle and a bed, and are fixed opposite to the bed so as to sandwich the steel strip with set. The rotating shaft can be set to form an acute angle with respect to the transfer line so that both surfaces of the steel strip with set can be symmetrically polished, and the circumferential surface of the rotating grindstone or a part thereof can be continuously formed on the back portion of the abdomen. Asa on the surface In the state where the edge of the grinding wheel is in contact, the peripheral edge of the grinding wheel forms a fillet at the boundary between the back and the abdomen forming surface, while continuously polishing the abdomen forming surfaces on both sides of the steel strip with set. The second step of forming a polished steel strip in which the set width of the saw tooth forming portion is larger than the back thickness of the back portion, and the first set is formed on the saw tooth forming portion by a conspicuous means. A guide comprising a third step of forming a sawtooth or a second sawtooth or a sawtooth portion in which these are mixed to form a sawtoothed steel strip, and a fourth step of punching the sawtoothed steel strip into a sawtooth shape to manufacture a sawtooth. It is based on a method of manufacturing a saw blade.

[0011]

DETAILED DESCRIPTION OF THE INVENTION AND

(Embodiment 1) A method for manufacturing a saw blade of a folding hand saw according to a first embodiment of the present invention will be described with reference to the drawings. The saw blade (1) of this embodiment has a total length of 300 mm and a maximum saw blade. Width 4
1 is a procedure of a saw blade manufacturing process, FIG. 2 is a schematic cross-sectional view of the saw blade, FIG. 3 is a front view of a state in which the steel strip with set (1a) is continuously polished, and FIG. 4 is a side view seen from the direction F in FIG. 3, and FIG. 5 is a partially enlarged view of the sawtooth portion.
As a first step, a saw-tooth forming part (2c), which is a basis of the saw-tooth part (2), is formed by pressing means on an edge forming a saw tooth in a post-step of a quenched steel strip (M) having a thickness of 0.8 mm, At the same time, the saw-teeth forming part (2c) is alternately bent so as to be distributed left and right with respect to the quenched steel strip (M) at a glance, and a set is formed by applying a set.
Obtain (1a). The set is a saw tooth forming part (2
An imaginary line connecting the tip of c) and a sawtooth forming part bent to the left side
The distance between the imaginary lines connecting the ends of (2c), that is, the set thickness width (2t) is slightly wider than the thickness of the hardened steel strip (M), and is 1.2 m.
m.

Next, as a second step, the steel strip with set (1a)
And the base line (L1) at a position 20 mm from the tip of the sawtooth forming part (2c), and the sawtooth forming part of the steel strip with set (1a).
Both side surfaces from the tip end of (2c) to the base line (L1) are symmetrically polished by the polishing means described later, and the abdomen (8) is connected to the sawtooth forming portion (2c) so as to secure a set. At the same time, the polished steel strip (1b) is formed so that the set thickness width (2t) is larger than the back thickness (7t) of the back portion (7).

The shape of polishing (see FIGS. 1 and 2)
By grinding the stealing part (9) uniformly on the left and right of (8), the thickness of the abdomen (8) is made constant at 0.6 mm,
In the vicinity of the sawtooth forming part (2c), the amount of polishing is reduced to smoothly connect the sawtooth forming part (2c) and the abdomen (8), and the tip part is only slightly polished and the sawtooth forming part (2c) is polished. The clams are aligned, and the fillet (7a) is formed at the boundary between the back (7) and the abdomen (8) to smoothly continue. Since the polishing amount and the polished portion are greatly related to the strength of the completed saw blade (1) against bending and torsion, the strength of the saw blade (1) can be adjusted by increasing or decreasing the polishing amount.

As shown in FIG. 3, the polishing means used in the second step is a polishing means comprising a rotating grindstone (11) rotated by a spindle (12) and a bed (10) supporting a steel strip with set (1a). A pair of devices and a transfer means for transferring the set-equipped steel strip (1a) in the direction of the arrow using the rotating roller (13), and the bed (10) is brought into contact with both sides of the set-equipped steel strip (1a). In addition, they are continuously arranged on the front and back of the set-equipped steel strip (1a) in parallel with the transfer direction.

Each of the rotating grindstones (11), which are opposed to and fixed to the bed (10) so as to secure a gap so as to sandwich the steel strip with set (1a), are rotated by the respective spindles (12). The both sides of the set-equipped steel strip (1a) are positioned so that they can be symmetrically polished.
0) and the angle with respect to the transfer direction of the set-equipped steel strip (1a) is set to be from 60 degrees to 80 degrees.

The rotational speed of each rotating grindstone (11) is set as the transport direction of the set-equipped steel strip (1a), and the transfer speed of the set-equipped steel strip (1a) is smaller than the peripheral speed of the rotary grindstone (11) in the gap. Then, the abdomen (8), the fillet (7a) and both sides of the clam are continuously polished.

As described above, the bed (10) is
(1a) is continuously arranged in parallel to the transfer direction on the front and back of the steel strip with a set (1a) so as to be in contact with both surfaces of the steel strip with a set.
By securing the gap between the bed (10) so as to sandwich the (1a) and fixing the rotating grindstones (11), the time and space between the front-side polishing step and the rear-side polishing step are reduced. The heat generated when polishing one side of the set-equipped steel strip (1a) is cooled by using air as a medium before polishing the other side, so that the set-equipped steel strip The temperature rise of (1a) can be prevented, without adverse effects such as baking back, and the temperature of the set-attached steel strip (1a) is kept low by a synergistic effect with a small amount of polishing, High quality saw blade
(1) can be manufactured.

Further, since the steel strip with set (1a) is sandwiched between the bed (10) and the rotary grindstone (12) and polished on each side, dimensional accuracy of the polishing amount can be easily secured, and the runout of the rotary grindstone can be ensured. In addition, it is possible to reduce a polishing amount error due to wear and the like, and to perform polishing without distortion continuously.

The rotating grindstone (11) has a bottom surface with a diameter of 150 mm on a cylindrical grindstone portion (11a) having a diameter of 150 mm and a thickness of 12 mm.
The truncated cone-shaped conical grindstone portion (11b) is continuously formed, the continuous portion (11e) is smoothly continuous, and the shape of the conical grindstone portion (11b) is a steel strip with set (1a). When polishing the abdomen (8) of (), the peripheral surface of the conical grindstone (11f) has a slight sawtooth formation (2c).
Is set to polish the tip of the rotating whetstone
The rotating shaft of (11) is a steel strip with a set (1) supported on the bed (10).
The angle θ with respect to the transfer line, which is an imaginary line parallel to the side surface of (a) and parallel to the transfer direction of the steel strip with set (1a).
Is set to 70 degrees. When the polishing means is viewed from the direction F, as shown in FIG. 4, the projection of the peripheral edge of the grinding wheel (11c) becomes elliptical, and the cylindrical grinding wheel peripheral surface (11d) is a steel strip with a set.
It is parallel to the side surface of (1a), and the continuous portion (11e) also has a smooth curve.

In polishing, first, a steel strip with a set (1
The saw tooth forming section (2c) of (a) is made parallel to the transfer line of the bed (10), and the point on the peripheral edge (11c) of the grinding wheel closest to the bed (10) is the base line (L1). The steel strip with a set (1a) is transferred while the vertical run-out of the steel strip with a set (1a) is controlled by a roller (14) so as to be on an extension line, and the rotary grindstone (11) is transferred to the bed (10). Abutting the side surface of the set-equipped steel strip (1a), polishing the side surface of the set-equipped steel strip (1a) to form a stolen portion (9), and then continuously polishing the back surface. Belly thickness (8
t) is a constant thickness of 0.6 mm, the clams on both sides are neatly aligned, the clam thickness width (2 t) is about 1.2 mm, and the back thickness (7
In t), since the back part (7) is not polished, a polished steel strip (1b) having a thickness of 0.8 mm as the thickness of the quenched steel strip (M) is obtained.

According to the above-mentioned polishing means, the rotating shaft of the rotary grindstone (11) is positioned and fixed at an angle θ of 70 ° with respect to the transfer line of the bed (10), and the set-equipped steel strip (1a) does not move in the vertical direction. By controlling the saw tooth forming part (2c) so as to be parallel to the transfer direction, the distortion of the steel strip with set (1a) during polishing does not occur, and the abdomen (8) Ni (the thickness of the rotating grindstone (11) 12mm) x si
A constant amount of polishing can be performed accurately and easily with a width of n70 degrees, and the boundary from the abdomen (8) to the back (7) is a stealing part.
When the thickness of (9) is 0.2 mm, the width is about 1.9 mm.
By forming the fillet (7a) in the shape of the projection of the peripheral edge (11c) of the grindstone over the entire surface, the surface is smoothly continuous by forming the fillet (7a). It is possible to reduce the amount and to slightly grind the tip, so that the set of the sawtooth forming portion (2c) can be made uniform. Furthermore, since the amount of polishing in the polishing process is a small amount, only polishing using a grinding wheel for finishing is sufficient, and it is easy to secure processing accuracy, so that the polished surface can be finished extremely smoothly, and the processing time is short. Is sufficient, so the heat generated by polishing is small and
The effect on (1a) is also small.

The polishing means is not limited to the embodiment described above, and the shape, size, angle θ between the rotating shaft and the transfer line of the bed (10) formed by the rotating grindstone (11), etc.
Needless to say, it can be changed according to the shape of (1), the width of the abdomen (8), etc.Because it is a part forming the fillet (7a), for example, chamfering the peripheral edge (11c) of the grindstone And the angle θ is increased by making the generatrix of the conical grinding wheel peripheral surface (11f) an arc, or the angle of the rotating shaft and the steel strip with set (1a) is made in any direction by making the shape of the grinding stone a truncated cone. You may make it set.

However, the angle θ between the rotation axis and the transfer line
If it is too large (more than about 80 degrees), the fillet (7a) will be smaller and the surface of the abdomen (8) will have a rotating grindstone (1
Since the streaks due to 1) are formed slightly coarsely in substantially parallel to the longitudinal direction of the saw blade (1), it is not preferable in securing the strength in the bending direction of the saw teeth.

Conversely, when the angle θ is small (about 60 degrees or less), the width of the fillet (7a) is increased, and the difference in thickness between the back (7) and the abdomen (8) is reduced. In the sawing work, the friction with the workpiece increases and the sawing operation becomes heavy, and the width of the abdomen (8) becomes narrow with respect to the thickness of the rotating grindstone (11), so that efficient polishing cannot be performed. Abdomen with one polishing
(8) In order to align the fillet portion (7a) and the set, it is necessary to use a thick rotating grindstone (11).

If the angle formed by the rotation axis of the rotary grindstone (11) with respect to the transfer line is set in the range of about 60 to 80 degrees, the streaks formed on the surface of the abdomen (8) become sufficiently fine, and the bending direction of the saw teeth This is preferable because the strength of the fillet (7a) can be ensured, the width of the fillet (7a) can be made appropriate, and efficient polishing can be performed.

Next, as a third step, a saw tooth portion (2) is formed on the saw tooth forming portion (2c) of the polished steel strip (1b) by an existing sharpening forming means to form a saw toothed steel strip (1c). As a four-step process, a steel cutter with a saw tooth (1c) is 300 mm in total length with a press cutter.
The saw blade (1) is completed by punching into a saw blade shape with a maximum height of 40 mm.

The shape of the saw tooth portion (2) will be described. As shown in FIG. 5, the saw tooth portion (2) comprises a first saw tooth (2a) and a second saw tooth (2b). (2a) shows the sawing direction (D) of the surface opposite to the direction bent by the set as shown in section A (hereinafter referred to as the "set inner surface").
The lower blade (3) is formed on the side, the upper blade (4) is formed on the side in the saw feeding direction (E), the upper blade (4) is formed on the tip, and the upper eye (5) is formed to cross the lower blade. The tip where (3) and the upper eye (5) intersect is the first
(6a) is formed. In other words, the first saw tooth (2a) has a set formed in the direction of the surface (hereinafter referred to as the "back of the tooth") opposite to the surface on which the lower blade (3) and the like are formed (hereinafter referred to as the "tooth surface"). Thus, each first crown (6a) forms the widest part of the sawtooth part (2), that is, the clam thickness width (2t).

Next, the lower blade (3) is not formed on the second saw tooth (2b) in the sawing direction (D), as shown in section B,
An upper blade (4) is formed on the side in the saw feed direction (E) side of the surface bent in the direction of the set (hereinafter referred to as “set outer surface”), and an upper stitch (5) is formed at a tip portion. 5) forms the second heaven (6b). Therefore, the second saw tooth (2b) is bent in the direction of the surface on which the upper blade (4) and the like are formed, that is, in the direction of the tooth surface, and a set is formed.
The opening width to the left and right of b) is smaller than the opening width of the first heaven (6a).

The arrangement of the first saw teeth (2a) and the second saw teeth (2b) is such that the tooth surface and back of the fourth first saw tooth (2a) are alternately arranged on the left and right sides of the saw blade (1). The second saw tooth (2b) is formed at every glance of the first saw tooth (2a), and the second saw tooth (2b) also has the tooth surface and the tooth back alternately in order. They are arranged to face left and right.

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 clam thickness width (2t) is obtained.
In this case, four first heavens (6a) and four second heavens (6b) are arranged in the width direction. 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 heaven (6a) and the second heaven (6a)
(6b) is arranged four in the width direction.

Therefore, if there are only two first ceilings (6a) on the left and right, a mountain having a triangular cross section remains at the center of the bottom surface of the crease of the material to be cut, and this mountain hinders the cutting operation. Therefore, the sawing is heavy and the sharpness is poor.However, by arranging four first heavens (6a) and four second heavens (6b), a mountain with a triangular cross-section Not only does the operation become lighter in cutting work, but the sharpness improves.

Incidentally, the saw according to the present invention is not limited to the embodiment described above, and the height of the back (7), the saw blade (1)
The height and the degree of formation of the set can be adjusted to the size and shape according to the use of the hand saw, and free processing is possible, such as forming a saw tooth part (2) combining various saw tooth shapes, As a result, it is needless to say that the stiffness and the shape of the teeth can be obtained according to the use of the guide saw.

[0033]

According to the method for manufacturing a saw blade of the present invention as described above, a temporal and spatial interval is generated between the polishing process of the front surface and the polishing process of the rear surface, and the Heat generated when polishing one surface of the steel strip (1a) is cooled using air as a medium before polishing the other surface, so that the temperature of the set-equipped steel strip (1a) can be prevented from rising. It is possible to produce a high quality saw blade (1) by maintaining the temperature of the steel strip with set (1a) low by the synergistic effect with the small amount of polishing without adverse effects such as returning to baking. it can.

In addition, since the steel strip with set (1a) is sandwiched between the bed (10) and the rotary grindstone (12) and polished on each side, the dimensional accuracy of the polishing amount is ensured, and the runout of the rotary grindstone is improved. An error in the amount of polishing due to abrasion or the like can be reduced, and the production efficiency of the saw blade (1) can be improved by continuously performing polishing without distortion.

Further, the thickness of the quenched steel strip (M) as a material only needs to have a thickness of a back thickness (7 t).
Can be used to reduce the material cost, and the part to be polished and finished is the abdomen (8) of the saw blade (1) and the formation of saw teeth (2).
c) Since only a part of the saw blade (1) is polished, the amount of material to be polished is very small as compared with the manufacturing method in which the entire saw blade (1) is formed by polishing. Since the saw blade (1) can be polished without distortion, the number of manufacturing steps is reduced, the number of manufacturing steps is reduced, the manufacturing cost can be reduced, and the economic efficiency can be improved.

Furthermore, since the rotating shaft of the rotary grindstone (11) is set at an acute angle to the transfer line of the steel strip with set (1a) and polished, the boundary between the back (7) and the abdomen (8) is polished. The fillet (7a) can be formed continuously in the part, the durability of the saw blade (1) against bending is improved, and the streaks formed in the saw tooth part (2) by polishing become sufficiently fine, and the saw tooth part (2) Prevents stress concentration occurring around the periphery, secures strength in the bending direction, enables the manufacture of saws with few sawtooth defects, and provides a clean set with uniform tooth tips. In the pulling, the cut of the material to be cut can be finely finished, and the resistance due to friction with the material to be cut is small, so that the saw can be lightened.

As described above, the amount of material to be polished is reduced, so that waste of material can be reduced. In addition, since the heat generated by polishing is small, the influence on the material is small, the polishing method is simple, and no distortion occurs in the saw blade. High-precision polishing can reduce the number of manufacturing steps and the number of steps in the manufacturing process, thereby reducing the manufacturing cost. Thus, it is possible to provide a method for manufacturing a saw blade having a guide saw, which is capable of manufacturing a saw blade having no distortion at low cost.

[Brief description of the drawings]

FIG. 1 shows a procedure of a manufacturing process of a saw blade.

FIG. 2 is a schematic sectional view of a saw blade.

FIG. 3 is a front view of a state in which the set-attached steel strip is polished on one side.

FIG. 4 is a side view of FIG. 3 viewed from a direction F.

FIG. 5 is a partially enlarged view of a sawtooth portion of the guide saw according to the first embodiment.

[Explanation of symbols]

 (1) Saw blade (1a) Steel strip with set (1b) Polished steel strip (1c) Steel strip with saw tooth (2) Saw tooth part (2a) First saw tooth (2b) Second saw tooth (2c) Saw tooth formation part (2t ) Set thickness (3) Lower blade (4) Upper blade (5) Upper eye (6a) First heaven (6b) Second heaven (7) Back (7a) Fillet (7t) Back thickness (8) Abdomen (8t) Belly thickness (9) Steal part (10) Bed (11) Rotating whetstone (11a) Cylinder whetstone part (11b) Conical whetstone part (11c) Whetstone peripheral surface (11d) Cylinder whetstone peripheral surface (11e) Continuous Part (11f) Conical grinding wheel peripheral surface (12) Spindle (13) Rotary roller (14) Roller (D) Sawing direction (E) Sawing direction (L1) Base line (L2) Tooth length center line (M) Hardened steel band

Claims (1)

[Claims] 1. A quenched steel strip which is smoothed from a coil state
On the edge forming the saw tooth of (M), a saw tooth forming portion (2c) corresponding to the saw tooth to be prominently formed in a later step is formed and a set is applied to form a steel strip with set (1a). A transfer means for transferring the set-equipped steel strip (1a) with the set secured, and a rotating grindstone (11) and a bed (1) arranged alternately along a transfer line and rotated by a spindle (12).
0), and each of the rotating grindstones (11) fixed opposite to the bed (10) so as to sandwich the set-equipped steel strip (1a) is a set-equipped steel strip. The rotating shaft can be set at an acute angle to the transfer line so that both surfaces of (1a) can be symmetrically polished, and the peripheral surface of the rotating grindstone (11) or a part thereof is continuously connected to the back (7). Contact the abdomen forming surface with the set in a state where the set is secured, and
c), while forming a fillet (7a) at the boundary between the back (7) and the abdomen forming surface, continuously polishing the abdominal forming surfaces on both sides of the set-equipped steel strip (1a) to form the abdomen ( 8) and the form in which the sets are aligned, and the abrasive steel strip (1b) in which the set thickness width (2t) of the saw tooth forming part (2c) is larger than the back thickness (7t) of the back part (7) is formed. Two processes, the first sawtooth (2a) or the second sawtooth (2b) or the sawtooth portion (2) in which these are mixed by the stand-out means on the sawtooth forming portion (2c).
Forming a saw-toothed steel strip (1c) into a saw-toothed steel strip (1c). Manufacturing method.