JPH0360916A - Saw and manufacture thereof - Google Patents

Abstract

PURPOSE:To easily cut in the hard body to be cut as well and to cut it easily by providing an edge part composed of an especially hard and strong edge tip body at the tip part of the base body part of each saw tooth fitted to a saw body. CONSTITUTION:A saw body 1 having no saw tooth shape is formed by a steel sheet 11 subjected to a heat treatment in advance. The base part end face 31 of the especially hard and strong slender edge tip body 3 having the length equivalent to the blade X long of the saw body 1 is joined with the tip face 212 of the edge tip body support part 21 of the saw body 1 under the state of the edge tip body support part 21 of the saw body 1 being difficult to receive the effect of heat and an edge body part 2 is formed. This edge body part 2 is notched from the tip part side of the edge tip body 3 to form the row of the saw teeth having an especially hard and strong edge part 32 at the tip part between each valley part 41 and a desired saw is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a saw for cutting objects that are particularly hard and difficult to cut with a normal saw, and a method for manufacturing the saw. ”ru.

[Conventional technology]

Conventionally used saws for cutting hard materials such as plywood and hard plastic materials include sawmills and hand-held circular saws such as chip saws and hand saws.Tipped saws have a super-hard alloy on the back side of the saw blade. It is made by brazing the tips of the above, etc., and the saw teeth, which have been heat treated with hand saws, are additionally hardened with an induction heating machine that utilizes the skin effect of high frequency waves to further increase their hardness.

By the way, as shown in Fig. 9, the above-mentioned chip saw brazes a cemented carbide chip on the back blade side of each saw tooth, and the type that uses high-frequency induction heating for hardening uses high-frequency induction heating to promote heating. Even if the current is distributed on the surface of the hardened part due to the skin effect, since the object to be heated is thin, the current distribution does not change much between the outside and the inside, and the hardened object becomes sticky as a whole. Furthermore, the tip of the sawtooth heats up faster than other parts and becomes heated, so the decarburization phenomenon is severe and the blade loses its properties as a knife.

[Problem to be solved by the invention]

In conventional tipped saws, the cemented carbide tip (B) is brought into contact with the back blade side of each sawtooth (A) and the joint is made by brazing, so brazing takes time and It is difficult to evenly bond the tip (B) to each sawtooth (A), and even a highly skilled craftsman cannot achieve an even bond, and uneven bonding may occur during use. Chips with poor bonding will peel off more easily than saw teeth. When a tip is chipped in this way, a chain reaction occurs in the tipped saw that places a heavy load on the subsequent saw teeth, causing them to break off, causing the tip to become defective. In addition, if the saw blades of this chip saw are small, the contact area with the chip will be small and the holding force for the chip will be insufficient and the chip will be lost, so the saw blade is made large in shape to hold the chip. Therefore, items with a large number of stitches and small shapes will not be passed through.

In addition, in the case where the hardness of the tip of the sawtooth is made even harder, the material of the hardened portion becomes almost glass-like, making it easy to chip.Furthermore, the hardness of the tip of each sawtooth is not uniform, causing a chain reaction of tooth chipping. There is a limit to this hardness, and compared to super hard alloys, it is softer and does not have long durability, so it cannot be expected to cut for a long time.

Now, while cutting a workpiece with such a hardened saw blade, there is a hard object such as a nail inside the workpiece, and wAf
If the i gets caught, the tip of the saw tooth, which is not durable, will break off, and even if you cut a normal workpiece afterwards, the stress will be placed on the neighboring saw teeth of the broken saw tooth, resulting in a chain of broken saw teeth one after another. It becomes unresponsive and ruins the saw. The quenching machine that performs this hardening is expensive, raising processing costs and requiring a skilled person to operate it.

[Means to solve the problem]

In order to solve the above-mentioned problem 7188, this invention follows the step of forming a saw blade (1) having no sawtooth shape from a steel plate (II) that has been heat treated in advance, and then the base portion (211) of the saw blade (11) The tip surface (211) of the blade tip support part (21)
Then, the base end surface (31) of a particularly hard and durable elongated cutting edge body (3) with a length corresponding to the blade length (X) of the saw blade (11) is attached to the cutting edge body supporting part (21) of the saw blade (1). A process of joining together to form the blade body part (2) under conditions that are not easily affected by heat;
Cut out the blade part (2) from the tip side of the cutting edge body (3),
Between each trough (4,) a row of serrations 4) with a particularly hard and durable cutting edge (32) at the tip is formed, or a saw is made of a preheat-treated steel plate (11). Body (1
Each trough (41) is formed by notching the trough-equivalent portion of the cutting edge body support (21) of the saw blade (1) and forming the trough (4,).
and (41), the saw blade (11 blade length (X) The process of joining the base end surface (32) of a particularly hard and durable elongated cutting edge body (3) having a length corresponding to In this step, the part corresponding to the valley following the valley part (41) of the cutting edge body (3) is removed to form a valley shape (four ridges) in the blade body part (2), and a groove is formed between each valley shape (four grooves). Each saw blade (4) attached to the saw blade (11) has been heat-treated in advance by a manufacturing method that includes a step of forming a saw tooth (4) having a hard and durable blade portion (3I) at the tip of the base portion (21). Base part (21) of
There is a saw that has a particularly hard and durable blade part (32) on the tip surface (21).

[Effect]

The saw configured as described above has a blade portion (38) provided on the tip surface (21□) of the base portion (211) in the saw tooth <4.
Because it is particularly hard and durable, it can cut into the workpiece well, even into hard workpieces that conventional saws cannot withstand, and it has excellent durability against wear. Excellent and can maintain good cutting quality for a long period of time.

Further, if the saw blade (1) is also made of a heat-treated steel plate (11), the strength will be increased, the plate thickness can be made thinner, and a saw with good dimensional accuracy with less distortion can be provided.

Furthermore, the connection of the cutting edge body (3) to the cutting edge body supporting part (21) in the saw blade (11) is such that the base end surface (32) of the elongated cutting edge body (3) having a length corresponding to the length (X) of the saw blade (11) ) The entire surface of the saw blade (1) is attached to the tip surface (21,
), it facilitates the joining work, such as brazing work, and also enables accurate and reliable formation of a uniform brazing layer, that is, strong brazing.

After this, in order to form serrations (4) on the blade body (2) formed by joining the base end surface (31) of the blade body (3) to the distal end surface (21□) of the blade body support part (21), A sawtooth (4) having a hard and durable cutting edge body (3) at the tip is exposed between the valleys (4,) and (41) by cutting out the blade body (2).

Furthermore, the blade portion (3f) at the tip of the sawtooth (4) is formed after the formation of the old sawtooth (4) in which the cutting edge body (3) is firmly joined to the blade edge body supporting portion (21) in the previous process. Also, it is firmly fixed at the tip of the sawtooth (4) and is less likely to come off from the sawtooth (4).

Note that brazing is the most common method for joining the cutting edge body (3) and the cutting edge body supporting portion (21).
In products that are bonded using heat, the area near the heated part is affected by the heat, causing the hardened corner parts to return to their original state, losing hardness and strength, and reducing functionality. The temperature rise shall be kept to the minimum possible level by cooling.

In addition, as another means for preventing the above-mentioned temperature rise, a trough (31) is provided in advance in the cutting edge body support part (21), and a base part (21,) is formed between the troughs (32) and (31). As a result, when the base end surface (32) of the cutting edge body (3) is joined by brazing or the like to the distal end surface (21) of the base portion (21,), the heat applied during brazing is absorbed by the base. Part (2++)
The heat is dissipated from the left and right side edges of the base body (2) so that it does not overheat. Therefore, according to this means, it becomes more difficult to undo the firing process, and the occurrence of distortion due to heat can be reduced.

〔Example〕

An embodiment of the present invention will be explained based on the attached drawings. Figure 1 in the drawings shows a single-edged hand saw with a blade length of 300 mm, which is similar to a woodworking saw used to cut hard wood such as plywood. In the front view, the front and side views with the serrations enlarged are the second
This is shown in Figs. In addition, an embodiment of the saw manufacturing method is shown in Fig. 4, Fig. 5, Fig. 9, and Fig. 8, and another second embodiment is shown in Fig. 6, Fig. 7, and Fig. 1θ. 8th
It is shown in the figure. FIG. 11 shows an example of a sawtooth portion of a conventional chip saw.

(No. 11 is a steel plate made of approximately 5K-4 material with a thickness of 1 mm that has been heat treated and surface cosmetically treated.
) A single-edged saw blade for woodworking with a handle at the base. The shape of this saw blade (fl) is a single-edged type woodworking saw in practice, but it may also be a double-edged type, and it can be used for pruning, forestry saws, saw blades, etc. In short, it is not limited to the embodiment as long as it is a saw used for cutting.

(2) is a blade part forming a sawtooth (4), and the sawtooth (4) is a tip surface (21,) of a base part (21,) with a thickness of 1ξ
2) with a 0.2 mm thick silver solder layer (6
) through the 1 mm thick cemented carbide blade (3
2) is provided. The example is the blade part (3
2) is made of a super hard alloy, but it may also be made of ceramics or special steel, and is not limited to the embodiment as long as it is hard and durable.

The above saw is manufactured in the following manner.

First, the material mentioned above is about 5K-4 and the thickness is 11
A single-edged saw blade 11) with a blade length of 240 mm is punched out of a 9-meter polished steel plate.
According to the manufacturing method of the first embodiment, the blade part (2) does not have a sawtooth shape but has a spore shape, and the blade part (2) has a spore shape.
The proximal end surface (211) of a cutting edge body (3) made of cemented carbide in the shape of an elongated rectangular bar with a length of 240 mm corresponding to the blade length of the blade body (2), and a wire width and a width of 1ξ mm each. 32) is brazed using a silver solder through the solder layer (5) with a depth of 0.2 mm.
Since the base portion (211) that supports the cutting edge body (3) is heated to 00°C, this heat will cause the base portion (211) to become unheated and reduce its strength, so it must be shielded and cooled to prevent it from becoming unhardened. This prevents the temperature from rising.

Once the blade body (2) is formed by joining the blade body (3) to the blade body support part (21) in this way, this blade body (2) can be cut using a rotary grinding tool such as a diamond wheel cutter, a laser beam, etc. It is cut out by a cutting means to form a trough (41), and a sawtooth (4) having a hard and durable blade part (32) at the tip is formed between the trough (4,) and (41>). It is something.

In addition, as another example, a material with a thickness of 0.559 meters that has been heat treated and surface polished in advance is 5K-4.
A single-edged saw blade with a blade length of 240 mm is punched out of a steel plate (11) of about 100 mm, and troughs (4,) are punched out at predetermined intervals in order to arrange the saw teeth in rows on the cutting edge body support (21). The valleys (41) and (4) are engraved using a punching method or the like.
1), a trapezoidal base portion (211) having a bonding surface capable of sufficiently sustaining the bonding between the distal end surface and the base end surface (3I) of the cutting edge body (3) is arranged in a row, and further the trapezoidal base portion is (211
) has a length of 240 mm on the tip surface, which corresponds to the length of the blade of this saw.
ξ meter, line width is 119 meters, width is 0.5
The proximal end face (31) of the cutting edge body (3) made of a millimeter-thick ultra-hard alloy is soldered with silver brazing to form a brazing layer (5) with a width of approximately 0.2ξ mm.
2), and further, in the cutting edge body (3) joined to the distal end surface of the base body part (211), the part facing the valley part (41>) is cut out using a diamond wheel cutter, a laser beam, etc. to form a base body part. A sawtooth (4) with a hard and durable blade part (3f) is attached to the tip of the sawtooth (211) in a valley shape (4).
t) and (42).

In order to form this valley, it goes without saying that the blade part (2) must be cooled, and the shape of the sawtooth (4) is a so-called rat-like sawtooth in the embodiment. ,
The serrations may be of serrations such as Gagari, Edo, Ibara, etc., and are not limited to the embodiments as long as they are serrations that can cut the object.

Furthermore, it goes without saying that the size, shape, and number of teeth of these saw teeth can be changed depending on the purpose of use.

〔Effect of the invention〕

According to claim 1, the saw of the present invention has a particularly hard and durable blade part (3t) joined to the tip of the sawtooth 4), so that it can cut with a hardness that conventional saws could not cut. It can easily cut into the object to be cut and cut it easily, and the saw teeth have high abrasion resistance, making it durable and long-lasting. In other words, the blade has extremely little wear during cutting work, and can be used for long periods of cutting work.
It is suitable for felling and pruning work in mountain forests, where it is difficult to notice, and does not require repeated sharpening like conventional methods, and is characterized by efficient cutting without reducing cutting efficiency due to cut ends. According to claim 2, with respect to providing the hard and durable blade portion (32) made of a superhard alloy or the like at the tip portion of the saw tooth (4), the formation of the tip portion, that is, the proximal portion necessary for cutting the saw tooth (4) is provided. Before forming the sawtooth shape, that is, at the time of forming the blade body, the base end surface (32, ) Since the entire part is joined, it is easy to join, and since it is easy to join, the joining can be done accurately and reliably, and the blade part (3t) does not come off from the sawtooth (3) during use. It can be said that a good joint can be achieved without any slits, and even if the thickness of the cutting edge body and the serrations are made considerably thinner, the joining can be done accurately and reliably from the above, and it is possible to form a very small blade part (triangular shape).

After this, the valley part (
4,), the sawtooth (4) with the blade part (3) firmly joined to the tip can be easily and easily formed between the troughs (4,) and (41), and the cost can be reduced. To provide a saw at a low cost. If this were to be done using conventional means, that is, joining small cemented carbide chips for each sawtooth, joining itself would be extremely difficult, and the joining would be uneven, resulting in chipping. However, according to the present invention, the joining operation is easy, and the joining between the sawtooth and the cutting edge at the tip is accurate, reliable, and strong. be.

According to claim 3, since the cutting edge support portion (21) is uneven, the base portion (21,
), and the valley (41), which is a recess, exists as a space.

Therefore, when the cutting edge body (3) is brazed to the base part (211), the high heat (approximately 600°C) applied to the base part (2°) and the cutting edge body (3) is applied to the left and right sides of the base part (211). In the cutting edge body (3), heat is quickly dissipated from the base end face on the trough (41) side, which reduces the occurrence of burn-back phenomenon and distortion of the base body (21), resulting in a good sawtooth (4). can be formed. That is, when the cutting edge body (3) is brazed to the base body (2), it is difficult for the base body (211) to be adversely affected by heat. As a result, it is possible to use the saw blade fi+ with a thin plate, and by making the blade as thin as possible, the sharpness can be improved, but the durability of the cutting edge is reduced and it stops cutting quickly. However, with this invention, even if the blade is made thinner, it can maintain good cutting quality with great durability for a long period of time.

[Brief explanation of drawings]

The drawings are diagrams showing implementation/71 of the present invention, in which Fig. 1 is a front view showing a single-edged hand saw, Fig. 2 is an enlarged front view of the sawtooth part, and Fig. 3 is an enlarged side view of the sawtooth part. Figures 4 and 5 show the first embodiment of joining the cutting edge body to the saw blade. Figure 4 is a perspective view before joining, Figure 5 is a perspective view after joining, and Figure 6 is a perspective view after joining. Figure 7 and Figure 7 show the second embodiment in which the cutting edge body is joined to the saw blade. Figure 6 is a front view before joining, Figure 7 is a front view after joining, and Figure 8 is the second embodiment. Fig. 9 is a cross-sectional view taken along line nn, Fig. 10 is a cross-sectional view taken along line m-m, and Fig. 11 is a perspective view of the saw-tooth portion of a conventional chip saw. This is an enlarged front view. 1: Saw blade 11: Steel plate 2: Blade body part 21: Blade support part II: Base body part 212: Tip face 31: Base end face 4, : Valley part X: Blade length 3: Blade body part 32: Blade part 42: Valley shape A : Sawtooth 11i! Teeth 5: Low layer B: Tip (2 others) Fig. 6 Fig. 8 Fig. 1: Saw blade 11 + Steel plate 21 Blade body part 2++ + Cutting edge body support part 2 Old straight part 212: Tip surface 3I Cutting edge rest 3++ JCelli1 321'FJw1 161 4++ Valley part 42 + Valley shape 5: Low layer ×: Blade length A: @Tooth B: Chi・ypu

Claims (1)

[Scope of Claims] 1. A blade portion (3_2) consisting of a particularly hard and durable cutting edge body is attached to the tip of the base portion (2_1_1) of each saw tooth (4) attached to the saw blade (1) which has been heat-treated in advance. ). 2 A step of forming a saw blade (1) without a sawtooth shape on a steel plate (1_1) that has been heat-treated in advance, and a saw blade (1)
The base end surface (3_1) of a particularly hard and durable elongated cutting edge body (3) having a length corresponding to the blade length (X) of the saw blade (1) is attached to the distal end surface (2_1_2) of the cutting edge body supporting part (2_1) of the saw blade (1). )
The blade support part (2_1) of the saw blade (1) is joined under conditions that are not easily affected by heat to form the blade body part (2), and the blade part (2) is joined to the blade body (3) to form a row of saw teeth (4) having a particularly hard and durable cutting edge (3_2) at the tip between each trough (4_1) by cutting out from the tip side of the A method for manufacturing a saw according to claim 1. 3. Each valley is formed by notching the saw blade (1) and the part corresponding to the valley of the cutting edge support part (2_1) of the saw blade (1) in the preheat-treated steel plate (1_1) to form a valley part (4_1). Between parts (4_1) and (4_1), the tip surface and the cutting edge body (3)
The base portion (2_
The proximal end surface (3_1) of a particularly hard and durable elongated cutting edge body (3) having a length corresponding to the blade length (X) of the saw blade (1) is joined to the tip surface (2_1_2) of the saw blade (1_1). The process of forming the body portion (2) and removing the portion corresponding to the valley following the valley portion (4_1) of the cutting edge body (3) in the blade body portion (2) to form a valley shape in the blade body portion (2). (4_2) and each valley shape (
4_2) Forming a sawtooth (4) having a hard and durable blade part (3_2) at the tip of the base part (2_1) between the saws (4_2) and 4_2). .