JPH0649249B2 - Saw meat manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a saw blade having a serration without a clam.

<Prior Art> The saw blades of the present hand saws are roughly classified into the following two types.

It is a type in which the saw teeth are rusted, and a type in which the saw teeth are not rusted by polishing (skipping) the saw blade targeted by the present invention.

As shown in FIG. 6 and FIG. 7, those of type No. ₁ have a uniform thickness t ₁ of the saw body 1 (for example, t ₁ = 0.6).
Since the saw teeth 2 are rubbed, the width t _{2 of the} tooth tip is naturally larger than the wall thickness t _{1 of} the saw blade 1 (for example, t ₂ = 0.9 mm). As a result, the left and right surfaces of the saw body 1 do not rub against the side surfaces of the cutting groove during the cutting work, and the saw moves smoothly.

A saw 5 having a saw blade 1 of this type generally requires a back metal 5. This is because the thickness t ₁ of the saw body 1 is relatively thin, and it is necessary to prevent the thinned root portion 3 of the saw body 1 from being excessively bent.

On the other hand, the type 6 saw blade 6 is as shown in FIGS. 8 and 9. In this type of saw body 6, the thickness t ₃ of its spine 7 is the smallest (for example, t ₃ = 0.6 m).
m), the thickness t ₄ of the belly 8 is the thickest (for example, t
4 = 0.9 mm), the left and right surfaces of the saw body 6 are polished. Therefore, in this case, even if the saw teeth 9 are not rubbed, the left and right surfaces of the saw blade 6 do not rub against the side surfaces of the cutting groove during the cutting work, and smooth sawing is possible.

Further, in the case of this type, since the polishing process of the saw body 6 is usually performed only on the portion corresponding to the blade crossing (see FIG. 8), the meat of the root portion 4 of the saw body 6 The thickness is relatively thick and, like the type described above, a back bar is not necessary.

The type 6 saw blade 6 has been conventionally manufactured as follows.

With reference to FIG. 10 and FIG. 11, a saw-tooth mold before saw teeth are attached (this is referred to as “work”).
The work is usually made by hollowing out a hardened steel strip. ) 1
0 is fixed at a predetermined position on the chucking table 11. This fixing is performed by electromagnetic force, for example. The chucking table 11 is movable in the direction of arrow A1. Then, the cup grindstone 13 rotated by the motor 12 is brought into contact with the work 10 to polish the surface of the work 10. At this time, the rotation axis of the cup grindstone 13 is not perpendicular to the surface of the chucking table 11, and the angle θ is set in the moving direction A1 of the chucking table 11.
It is tilted by 1. Further, the sensor of the rotation axis of the cup grindstone 13 is adjusted so as to move along the upper side of the work 10. Since the thickness is adjusted as described above, the wall thickness of the upper side portion of the polished work 10 can be minimized.

<Problems to be Solved by the Invention> In the conventional method for manufacturing a saw body described above, a step of setting the hollowed-out works 10 one by one on the chucking table 11 is required. Therefore, the work is extremely troublesome. Further, even if the above steps are performed by a robot, the steps of setting the work 10 are not reduced.

Further, in the conventional polishing method, the work 10 is set on the chucking table 11 and polished one by one. Therefore, the work 10 is warped or distorted during the polishing of one surface or after the polishing due to heat generated during polishing. To do. In particular, a work with a thin plate has a large distortion. Therefore, the work 10
However, there is a problem that the process for removing the strain of the work 10 is required before the remaining one surface is polished, and the number of processing steps is increased and the manufacturing efficiency is poor. Moreover, even if the work 10 is strained, it is difficult to completely remove the strain,
There is a problem that it is difficult to evenly grind both sides of the saw body and the finishing accuracy of the saw body is poor.

Therefore, an object of the present invention is to provide a saw body manufacturing method capable of efficiently producing a saw body with high finishing accuracy.

<Means for Solving the Problems> The present invention is a method for manufacturing a saw blade having unsawed saw teeth, which comprises a long steel strip formed by a polishing device including at least two sets. Grinding from both sides simultaneously, thereby forming a steel strip in which one side of the long steel strip has the thickest thickness, and then the one side of the steel strip after polishing, which has the thickest thickness. The present invention is characterized in that the steel strip is cut to form a sawtooth mold so that the sawtooth becomes the belly of the sawtooth.

<Operation> According to the method for manufacturing a saw according to the present invention, at least 2
Since both sides of the steel strip are simultaneously polished by the polishing device consisting of one set of bases, the above-mentioned steel strip may be warped or distorted at the time of polishing or at the end of polishing due to heat generated during polishing, regardless of the plate thickness of the hardened steel strip. There is nothing to do. Therefore, both sides of the steel strip can be evenly polished. Moreover, since a long steel strip is used, the conventional step of installing hardened steel on a chucking table is not required, and the steel strip is continuously ground to provide the thickest one side. It is now possible to form long steel strips.

Further, since the long steel strip is cut after polishing the steel strip, it is possible to continuously form a prototype of the saw blade.

<Example> Hereinafter, an example of the present invention will be specifically described with reference to the drawings.

FIG. 1 is an illustrative view showing one example of a polishing apparatus for realizing a polishing step according to one embodiment of the present invention.

In FIG. 1, a hardened steel strip 22 drawn from a wound hardened steel strip (this is called a hoop) 21 is applied with a constant tension by a first roller pair 23 and a second roller pair 24. While being sent, it is sent in the direction of arrow A2.

More specifically, the second roller pair 24 is a roller pair having a relatively large diameter, rotates in the direction of arrow A3, and causes the quenched steel strip 22 to rotate.
Is a pair of feed rollers that conveys in the direction of arrow A2. on the other hand,
The first roller pair 23 is a tension roller pair and applies a constant tension to the hardened steel strip 22 in the direction opposite to the transfer direction arrow A2, and therefore rotates in the arrow A4 direction. As a result, the hardened steel strip 22 between the first roller pair 23 and the second roller pair 24 is
The roller pair is in a state of being tensioned in the left-right direction with a constant force, and while the tension state is maintained, the arrow A2
It is transferred in the direction.

If the hardened steel strip 22 has a relatively large thickness (for example, 1.2 mm thick), the hardened steel strip 22 hardly bends, and thus the first roller pair 23 can be omitted.

Between the first roller pair 23 and the second roller pair 24, there is a first
Two sets of polishing devices, that is, a polishing device 25 and a second polishing device 30, are arranged, and a polishing process is performed in which the steel strip 22 is sandwiched by the polishing devices 25 and 30 and polished. The first polishing device 25 has a cup grindstone 27 rotated by a motor 26 and a cup grindstone 29 rotated by a motor 28, and the cup grindstone 27 covers one surface of the quenched steel strip 22 and the cup grindstone 29 Quenched steel strip 22
The other surface of each is simultaneously polished. At this time, the cup grindstones 27 and 29 are made coarse so that the polishing becomes rough.

The cup grindstone 27 and the cuck grindstone 29 are the hardened steel strip 22.
Are symmetrically arranged on the left and right sides with respect to the length direction (that is, the transfer direction arrow A2) of each cup grindstone 2
The rotation axes of Nos. 7 and 29 are not perpendicular to the surface of the hardened steel strip 22 and are inclined by an angle θ2 in the direction opposite to the transfer direction arrow A2. Further, the sensors of the rotating shafts of the cup grindstones 27 and 29 are set substantially at the center of the hardened steel strip 22 in the vertical width direction.

Similarly to the first polishing device 25, the second polishing device 30 also includes two cup grinding stones 32 rotated by a motor 31 and a cup grinding stone 34 rotated by a motor 33. Are symmetrically arranged on both the left and right sides of the steel, and the left and right surfaces of the hardened steel strip 22 are polished simultaneously. In this embodiment, the cup grindstones 32 and 34 are used for fine polishing.

The gap between the pair of cup grindstones 27, 29 and the cup grindstones 32, 34 is detected by an optical sensor (not shown) or the like. It is adjusted by an adjusting device (not shown) so that the gap between the cup grindstones forming the slab is held to a predetermined size. As a result, when polishing the hardened steel strip 22, the thickness of the hardened steel strip 22 does not vary or change.

The polishing apparatus according to this embodiment is provided with a first polishing apparatus 25 and a second polishing apparatus 30. In the case where, for example, a pair of cup grindstones also serves for rough polishing and finish polishing, one polishing apparatus is used. The polishing can be performed by the device.

The polishing apparatus further includes position regulating rollers 35, 36, between the first roller pair 23 and the second roller pair 24 so that the hardened steel strip 22 does not vertically shift or vibrate during transfer.
37 are arranged appropriately.

FIG. 2 is a diagram for explaining the content of polishing by the polishing apparatus of FIG. The hardened steel strip 22 drawn out from the hoop 21 has a uniform wall thickness t _{0 as shown} in FIG. When the hardened steel strip 22 is polished by the first polishing device 25 and the second polishing device 30 as described above, the central portion C of the hardened steel strip 22 is most polished as shown in FIG. 2 (b). Then, the upper portion U is then polished a lot and the lower portion D is polished the least. Therefore, as shown in FIG. 2 (c), the cut surface of the hardened steel strip 22 after polishing has the smallest thickness t ₅ at the center, the largest thickness t _{6 at the} lower end, and the thickest t _{6 at} the upper end. The wall thickness t ₇ becomes thinner than that. As described above, each of the cup grindstones 27, 29, 32,
This is because the center of the rotating shaft of 34 is set substantially at the central portion in the vertical width direction of the hardened steel strip 22.

As an example of specific numerical values, the quenched steel strip 22 before polishing
Has a thickness t ₀ of 1.0 mm. The hardened steel strip 22 after polishing has a wall thickness t ₆ of 0.9 mm at the lower end, which is the belly of the saw blade, and a wall thickness t of the thinnest part of the center portion.
_The polishing apparatus is set so that ₅ is 0.6 mm. This setting is performed by adjusting the distance between the cup grindstones 27 and 29 and 32 and 34, the diameter of each cup grindstone, and the cup grindstones 27 and 2.
This is done by appropriately selecting the arrangement angle θ2 of 9, 32, and 34.

From the hardened steel strip 22 polished as described above, a saw blade mold 38 is cut as shown in FIG. 2 (b) to form a saw blade prototype. In other words, the saw blade mold 38 is hollowed out by pressing or the like so that the bottom side of the hardened steel strip 22 having the thickest thickness is the belly of the saw blade.

As a result, in the saw mold 38, the belly 39 portion has the largest wall thickness, and the bulge having the second largest wall thickness becomes the back 40 portion. At this time, if the saw mold 38 has a shape as shown in FIG. 2 (b), the root portion has more thick back 40 portions, and the back 40 portions become thicker toward the tip. The body has an ideal waist strength that makes it narrower and easier to bend.

The saw blade die cut from the hardened steel strip 22 that has been abraded is not limited to the saw blade die shown in FIG. 2 (b), but may be the saw blade die shown in FIG. Also in the case of the saw blade type 41 shown in FIG. 3, the back 40 has a larger wall thickness than the central portion,
It has a strong waist and is very easy to use.

When the vertical width of the hardened steel strip 22 matches the vertical width of the saw blade, the hardened steel strip 22 is appropriately cut instead of forming the saw blade prototype by hollowing. All you have to do is form the prototype of the saw body.

Further, in addition to cutting the hardened steel strip 22 to form a saw blade prototype, the saw blade prototype may be formed from a steel strip that has not been quenched and then quenched. Saw blade 4 completed by toothing the saw blade mold 38 formed as described above.
It is a figure which shows the cut surface of 4. Further, FIG. 5A is a schematic view showing a part of a cut surface when the material 42 is cut by the saw blade 44, and FIG. 5B is a partially enlarged view thereof.

As shown in FIG. 5B, the blade angle α2 at the tip of the sawteeth 45 according to this embodiment is sharper than the blade angle α1 of the conventional sawteeth. This is because both surfaces of the saw body 44 are polished so as to form a gentle concave curved surface.
Therefore, the gap between the sawteeth 45 and the cut groove side wall 43 also becomes large. Therefore, according to the saw body 44 of this embodiment, sharp teeth can be attached and the sharpness can be improved.

In the above-mentioned manufacturing method, an example in which two sets of polishing devices, that is, the first polishing device 25 and the second polishing device 30 are used for polishing, is shown. Should be polished at the same time.

Further, three sets of polishing devices may be arranged and the polishing devices may perform stepwise polishing such as rough polishing, medium polishing and polishing polishing.

The hardened steel strip after polishing may be immediately subjected to a step of hollowing out the saw blade mold, or it may be cut into a predetermined size once to form a saw blade prototype from the cut steel strip. May be.

In the above description of the method for manufacturing the saw body, the example in which the central portion of the hardened steel strip 22 is polished to the thinnest is shown, but the upper side of the hardened steel strip 22 is thinnest, that is, the conventional clam The same polishing as the saw blade having no saw teeth may be performed.

<Effects of the Invention> According to the present invention, since both sides of the steel strip are simultaneously polished by the polishing device consisting of at least two sets, distortion or the like is prevented from occurring during polishing regardless of the plate thickness of the steel strip. be able to. As a result, both sides of the steel strip can be evenly polished, and the finishing accuracy of the product can be improved.

Further, the conventional process for removing strain can be eliminated, and since the steel strip is continuously polished by using the long steel strip, the conventional hardened steel is installed on the chucking table. Since the process can be deleted, the processing cost can be reduced.

Therefore, it is possible to efficiently manufacture a saw body with high finishing accuracy.

[Brief description of drawings]

FIG. 1 is an illustrative view showing an example of a polishing apparatus for performing polishing according to an embodiment of the present invention. FIG. 2 is a diagram for explaining the content of polishing by the polishing apparatus. FIG. 3 is a diagram showing another shape of a saw-toothed hollowed-out hardened steel strip. FIG. 4 is a sectional view of a saw body according to an embodiment of the present invention. FIG. 5A is a cross-sectional view of a material cut by a saw according to an embodiment of the present invention. FIG. 5B is a partially enlarged view of FIG. 5A. FIG. 6 and FIG. 7 are views for explaining a conventional saw-bladder having teeth. FIG. 8 and FIG. 9 are views for explaining a saw body having teeth without grind by a conventional polishing process. FIG. 10 and FIG. 11 are diagrams for explaining the conventional polishing process. In the figure, 22 ... Hardened steel strip, 25 ... First polishing device, 27, 29 ... Cup grindstone, 30 ... Second polishing device, 32, 34 ... Cup grindstone, 38, 41 ... Saw Body type, 39 ... Belly, 40 ... Back, 44 ... Saw, 45 ...
... shows saw teeth.

Claims (1)

[Claims] 1. A method for manufacturing a saw blade having unsawed saw teeth, wherein a long strip of steel is simultaneously polished from both sides by means of at least one pair of polishing devices, To form a steel strip in which one side of the long steel strip has the thickest wall thickness, and then the thickest one side of the steel strip after polishing becomes the belly of the saw blade. As described above, the method for producing a saw body, which comprises cutting the steel strip to form a prototype of the saw body.