JPH0825137A - Tip saw for cutting material which is hard to cut - Google Patents

Abstract

PURPOSE:To provide a tip saw, by which cutting efficiency to a material hard to cut such as stainless steel can be improved, for cutting the material hard to cut. CONSTITUTION:A tip saw for stainless steel is made of metallic material and consists of a disk main body, in which a projecting base metal part 21 is formed in the circumferential edge part, and cemented carbide tips 30 arranged in the projecting base metal part 21. The projecting base metal part 21 is divided into two first sections A1 and two second sections A2 by the tooth height of the arranged cemented carbide tips 30, so that the projecting base metal part 21 is divided into four sections as a whole. The tooth height of the cemented carbide tip 30 arranged in the second sections A2 is lower than that of the cemented carbide tip 30 arranged in the first section A1 by 0.05-0.2-mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip saw in which a cemented carbide tip is provided on a tooth portion formed on a peripheral portion of a circular saw, and more specifically, a difficult-to-cut material such as stainless steel is used. The present invention relates to a tip saw for cutting difficult-to-cut materials, which is preferably used for cutting.

[0002]

2. Description of the Related Art Heretofore, various tip saws for cutting difficult-to-cut materials such as stainless steel have been proposed.

Here, factors that affect the machinability of the tip saw include the peripheral speed of the tip saw and the rake angle of the tooth portion formed on the tip. It is known that the higher the peripheral speed of a tip saw, the better the cutting efficiency. Generally, the peripheral speed of a tip saw is 1000 m /
min. Used under conditions above.

It is known that the larger the rake angle of the tooth portion, the smaller the cutting resistance with the material to be cut and the easier it is for the tooth portion to bite into the material to be cut, thereby improving the cutting efficiency. . However, the improvement of the cutting efficiency is an effect obtained by the tooth portion coming into frequent contact with the material to be cut, so that the tooth portion is severely worn and chipped, and the life thereof is shortened.

By the way, stainless steel, which is one of difficult-to-cut materials, has a higher strength than general steel materials, and the strength does not decrease even when the member temperature rises during cutting. have. In addition, since it has lower thermal conductivity than ordinary steel materials, friction heat generated between the blade tip and the member when cutting with a tip saw is difficult to be conducted to the stainless steel side, and the tip side tip temperature. Has a characteristic that it rises and damages the cutting edge easily.

Therefore, in consideration of the characteristics of difficult-to-cut materials such as stainless steel, for example, a tip saw is proposed in which the rake angle is set from 0 degree to a negative angle to suppress the wear and chipping of the teeth. Has been done. According to such a tip saw, it is possible to effectively suppress wear and chipping of tooth portions when cutting stainless steel having higher hardness than general steel materials.

Further, the rake angle is as large as 27 degrees and the peripheral speed is 200 m / min. A tip saw having improved machinability used in the following has been proposed. According to this tip saw, the resistance to the material to be cut is reduced and the machinability can be improved.

[0008]

However, it is difficult to say that the conventional tip saw has a well-balanced tip saw since only one of the machinability and the wear resistance is improved.

That is, with a tip saw with a reduced rake angle, although the wear and chipping of the teeth can be suppressed, the cutting efficiency is reduced and the work efficiency is deteriorated.
Further, there is a problem that the durability of the blade portion is lowered because the temperature of the cutting portion rises.

Further, a tip saw having a large rake angle can improve the machinability at the level of the work and the cutting edge, but the peripheral speed is 200 m / min. Since it is used under the following special conditions, there is a problem that the overall cutting efficiency cannot be improved. Further, such a low peripheral speed cannot be realized by the conventional circular saw machine and has a problem that it lacks versatility.

Further, as a method of cutting difficult-to-cut materials such as stainless steel without using a tip saw, a nibbler method of cutting stainless steel by repeatedly bending it,
There are cutting methods such as a shearing method and a plasma cutting method for cutting using a shearing machine. However, with these cutting methods, it is not possible to obtain a good cut surface, which is obtained when a material to be cut made of another material is cut using a tip saw, and the cutting cost is high. Had a point.

The present invention has been made in order to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a tip saw for cutting a difficult-to-cut material which can improve the cutting efficiency for a hard-to-cut material such as stainless steel. To aim.

[0013]

To achieve the above object, a tip saw for cutting difficult-to-cut materials according to the present invention comprises a disc-shaped main body having a plurality of convex base metal portions formed along a peripheral edge thereof. A hard-to-cut material having a cemented carbide tip on which a blade having a desired shape is formed and a plurality of teeth formed by disposing one or more of the cemented carbide tips on each of the convex base metal portions. In the cutting tip saw, the convex base metal portions are adjacent to each other and are divided into the same number of first sections and second sections, and the cemented carbide tips arranged in the second sections are divided into the first sections. It is provided as a configuration that the blade height is higher or lower than the blade height of the cemented carbide tip to be disposed.

At this time, the convex base metal part includes two first base parts.
It is desirable to be divided into a total of four compartments including a compartment and two second compartments. Further, the tooth portion may be configured by disposing a cemented carbide tip having a flat blade-shaped blade portion formed thereon, and further, the tooth portion may have a flat blade-shaped blade portion. It may be configured by arranging the formed cemented carbide tip and the cemented carbide tip on which the chamfered flat blade-shaped blade portion is formed in combination.

[0015]

In the tip saw for cutting difficult-to-cut materials according to the present invention having the above-mentioned structure, the tip saw starts rotating by mounting the main body on a generally used circular saw machine and turning on the power. Then, when the tooth portion provided with the cemented carbide tip is brought into contact with the material to be cut, the material to be cut is cut by the cemented carbide tip having the blade portion having a desired shape.

That is, when the portion of the material to be contacted with the cemented carbide is compressed, shear stress is generated inside the material, and when this shear stress exceeds a predetermined value specific to the material. Slip occurs inside the work material, and the relevant part is scraped off. At this time, the cutting state of the material to be cut is
It depends on the shape of the blade formed at the tip of the cemented carbide tip and the combination of the cemented carbide tips arranged as teeth.

For example, when one cemented carbide tip having a flat blade-shaped blade portion is provided, the material to be cut is all cut by the flat blade-shaped blade portion. If the flat blade carbide tip and the chamfered flat blade carbide tip are combined with a step, the material to be cut is cut with a flat blade-shaped blade and a chamfered flat blade-shaped blade. The cutting resistance applied to each carbide tip (blade portion) is suppressed, and the cutting is efficiently performed while suppressing damage to the blade portion.

By the way, in the tip saw for cutting difficult-to-cut materials according to the present invention, the convex base metal portion formed on the peripheral portion of the main body is an even number of sections alternately divided into the first section and the second section. have. Then, in the second section, the cemented carbide tip is arranged so as to have a blade height higher or lower than the blade height of the cemented carbide tip arranged in the first section.

Therefore, when cutting the material to be cut, not only the cutting of the material to be cut due to the shearing stress described above but also the cemented carbide chips arranged with a height difference contact the material to be cut. Along with this, vibration cutting is performed in which vibration is applied to the material to be cut. As a result, difficult-to-cut materials such as stainless steel, which were difficult to cut due to shear stress, are efficiently cut. In addition, in order to cancel the irregular vibration etc. which generate | occur | produce in the tip saw for difficult-to-cut material cutting with vibration cutting, the total division of a 1st division and a 2nd division is divided into 2 divisions and 2 divisions, for example. It is necessary that the number of first partitions and the number of second partitions be the same, as in the case of a total of four partitions.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a stainless steel tip saw will be described below with reference to the drawings.

First, the construction of the stainless steel tip saw 10 will be described with reference to FIGS. The stainless steel tip saw 10 is made of a metal material and has a disk-shaped main body 20 having a convex base metal portion 21 formed on the peripheral edge thereof.
And a cemented carbide tip 30 disposed on the convex base metal portion 21 as a configuration.

The main body 20 has a first section A, as will be described later.
1 has a maximum diameter of 180 mm with the carbide tip 30 and the thickness is 1.5 mm. Further, the main body 20 includes a tip saw 10 for stainless steel.
A center hole 22 is formed in the center of the circular saw machine (not shown). The convex base metal portion 21 is a base metal portion on which the carbide tip 30 is disposed, and determines the rake angle of the carbide tip 30.

In this embodiment, in consideration of cutting difficult-to-cut materials, the convex base metal portion 21 having a small rake angle is used.
Is drawn on the drawing. Furthermore, the convex base metal part 21 is
Depending on the blade height of the cemented carbide tip 30 arranged, the first section A1
And the second section A2. In this embodiment, the first section A1 and the second section A2 are each divided into two sections, that is, a total of four sections.

The cemented carbide tip 30 is a substantially rectangular plate-shaped blade body made of tungsten carbide (WC), and a flat blade-shaped blade portion 31 is formed at the tip thereof. Further, the cemented carbide tip 30 is joined to the main body by brazing along the radial direction in the convex base metal portion 21.

At this time, the cemented carbide tip 30 arranged in the second section A2 has a blade lower by 0.05 to 0.2 mm than the blade height of the cemented carbide tip 30 arranged in the first section A1. Arranged to have a height. Therefore, the diameter of the main body 20 in the portion provided with the cemented carbide tip 30 in the second section A2 is 179.95 to 179.75 mm.

In this way, the carbide tip 3 is attached to the convex base metal portion 21.
By arranging 0, the tooth portion 23 that is a functional portion for cutting the material to be cut is formed, and the tip saw 1 for stainless steel 1
0 is completed.

Next, the operation of the stainless steel tip saw 10 having the above-described structure according to this embodiment will be described. The stainless steel tip saw 10 is attached to a circular saw machine (not shown) through the center hole 22. Then, when the circular saw machine is started, the stainless tip saw 10 starts to rotate and its peripheral speed is 800 to 2500 m / min. Reach Then, when the peripheral speed becomes stable, the cutting work is started.

When the circular saw machine is brought closer to the material to be cut, the tooth portion 23 formed on the peripheral edge of the stainless steel saw 10 comes into contact with the material to be cut, and the cemented carbide tip 30 forming the tooth portion 23. The flat blade-shaped blade portion 31 gradually cuts the material to be cut, thereby cutting the material to be cut.

That is, the carbide tip 30 of the material to be cut
When the contacted part is compressed, shear stress is generated inside the work material, and when this shear stress exceeds the specified value specific to the work material, slip occurs inside the work material and the corresponding part is scraped off. It is done. Then, when the corresponding portion is cut, a new cut portion is exposed on the cut material, and the carbide tip 30 is brought into contact with the cut portion to perform cutting. By repeating this cutting process, the material to be cut is divided into two members, and when all the material to be cut located in the traveling direction of the tip saw 10 for stainless steel is cut, the material to be cut is cut into two independent members. It

At this time, the cutting state of the material to be cut is such that the shape of the flat blade-shaped blade portion 31 of the carbide tip 30, the combination of the carbide tips 30 arranged as the teeth 23, and the tip saw 10 for stainless steel. It depends on the peripheral speed.

Stainless steel tip saw 1 according to the present embodiment
No. 0 is integrally provided with the carbide tips 30 each having the flat blade-shaped blade portion 31 formed on the tooth portion 23, and all the materials to be cut are cut by the flat blade-shaped blade portion 31.

By the way, in the stainless steel tip saw 10 according to the present embodiment, the convex base metal portions 21 formed on the peripheral portion of the main body 20 alternate between the first section A1 and the second section A2.
It has an even number of sections divided into and. And the carbide tip 30 is arranged in the second section A2 so as to have a blade height which is lower by 0.05 to 0.2 mm than the blade height of the carbide tip 30 arranged in the first section A1. Has been done.

Therefore, when cutting the material to be cut, not only the cutting of the material to be cut due to the shear stress described above but also the cemented carbide tips 30 arranged with a height difference contact the material to be cut. Accordingly, vibration cutting is performed in which vibration is applied to the material to be cut. This vibration cutting can obtain a large cutting energy as compared with the shear cutting in which the material to be cut is cut by the shear stress. As a result, even difficult-to-cut materials such as stainless steel, which were difficult to cut only by shear cutting, can be efficiently cut.

However, when the carbide tips 30 are arranged at different heights and vibration cutting is performed, irregular vibration is likely to occur in the stainless tip saw 10 itself, so that irregular vibration is suppressed. Need to let. Therefore, in this embodiment, the first section A1 is divided into two sections and the second section A1.
By dividing 2 into 2 sections, a total of 4 even sections, the irregular vibrations and the like that occur due to impact and vibration are offset, and the stainless steel tip saw 10 is balanced as a whole.

As described above in detail based on the embodiment, the tip saw 10 for stainless steel according to this embodiment has the convex base metal portion 21 in two first sections A1 and two second sections A1.
A cemented carbide tip 30 that is arranged in the second section A2 in 2
The blade height of is smaller than the blade height of the cemented carbide tip 30 arranged in the first section A1.

Therefore, when the cemented carbide tip 30 comes into contact with the material to be cut, vibration due to the height difference of the blade is generated in the material to be cut, and vibration cutting is performed. The cutting efficiency with respect to can be dramatically improved.

The first section A1 and the second section A2 are
Since they are alternately distinguished so that the total number thereof is an even number, irregular vibration occurs in the stainless steel tip saw 10 even when vibration cutting is performed due to the height difference of the cemented carbide tip 30. Can be prevented. Therefore, it is possible to eliminate the obstruction of the cutting work due to the irregular vibration and to suppress the abrasion and chipping of the flat blade-shaped blade portion 31 of the carbide tip 30.

Furthermore, since a difficult-to-cut material such as stainless steel can be easily cut by a cutting method using a tip saw, it can be obtained by another cutting method such as a shearing method in which a shearing machine is used for cutting. A smooth cut surface can be obtained as compared with the cut surface. Further, it is possible to cut a difficult-to-cut material such as stainless steel at a lower cost than other cutting methods.

The present invention has been described above based on the embodiments, but the present invention is not limited to the above embodiments, and various modifications and improvements can be made without departing from the spirit of the present invention. It is easily guessed.

For example, in this embodiment, the convex base metal portion 21 is divided into two first sections A1 and two second sections A2, which is a total of four sections. , The number of the second sections A2 is not limited to this as long as it is the same. That is, it is sufficient that the carbide tips 30 having different blade heights are arranged in the convex base metal portion 21, and if the number of the first sections A1 and the number of the second sections A2 are the same, for stainless steel This is because the vibration generated in the tip saw 10 can be effectively suppressed.

Further, in the present embodiment, the tip saw body 20 is
Although the cemented carbide tip 30 having the flat blade-shaped blade portion 31 is provided in the above, the cemented carbide tip 30 having various blade portions may be used depending on the material of the material to be cut and the cutting conditions. For example, as shown in FIG. 4, a carbide tip 30 having a flat blade edge 31 and a carbide tip 33 having a chamfered flat blade edge 32.
And may be combined with a step. In such a case, since the flat blade-shaped blade portion 31 and the chamfered flat blade-shaped blade portion 32 share the cutting of the material to be cut, the respective carbide tips 3
Cutting resistance applied to 0, 33 is suppressed, and each blade portion 30, 3,
It is possible to perform efficient cutting while suppressing the damage of item 3.

Further, as shown in FIG. 5, a cemented carbide tip 40 having a blade portion 41 inclined to the right side and a cemented carbide tip 42 having a blade portion 43 inclined to the left side may be arranged in combination. . In such a case, the load on each of the blade portions 41 and 43 is dispersed, the cutting resistance is suppressed, and the cutting can be performed efficiently.

[0043]

As described above, in the tip saw for cutting difficult-to-cut material according to the present invention, the convex base metal portion is divided into the same number of the first section and the second section, and is disposed in the second section. The blade height of the hard tip is arranged to be higher or lower than the blade height of the cemented carbide tip arranged in the first section. Therefore, the cutting efficiency for difficult-to-cut materials such as stainless steel can be improved.

Further, a cutting operation suitable for the material to be cut can be performed by disposing a carbide tip having a different blade shape on the convex base metal portion in accordance with the material of the material to be cut and the cutting conditions. You can

[Brief description of drawings]

FIG. 1 is a side view showing a schematic configuration of a stainless steel tip saw according to the present embodiment.

FIG. 2 is an explanatory view showing an enlarged view centering on a boundary portion between a first section and a second section of the convex base metal portion in FIG.

FIG. 3 is an explanatory view showing a state in which a cemented carbide tip having a flat blade section is arranged on a convex base metal section in the present embodiment.

FIG. 4 is an explanatory view showing a state in which a cemented carbide tip having a flat blade edge portion and a cemented carbide tip having a chamfered flat blade edge portion are combined and arranged on a convex base metal portion.

FIG. 5 is an explanatory view showing a state in which a cemented carbide tip having a right-side inclined blade portion and a cemented carbide tip having a left-side inclined blade portion are combined and disposed on a convex base metal portion.

[Explanation of symbols]

10 ... Stainless steel tip saw, 20 ... Main body, 21 ... Convex base metal part, 23 ... Tooth part, 30 ... Carbide tip, 31 ... Flat blade-shaped blade part, A1 ... First section, A2 ... Second section

Claims (4)

[Claims] 1. A disk-shaped main body having a plurality of convex base metal portions formed along a peripheral edge thereof, a cemented carbide chip having a blade portion having a desired shape, and each of the convex base metal portions. In a tip saw for cutting difficult-to-cut materials, which comprises a plurality of tooth portions formed by disposing one or a plurality of the super hard tips in the above, the convex base portions are adjacent to each other and the same number of first sections The cemented carbide tip divided into a second section and arranged in the second section is the first section.
A tip saw for cutting difficult-to-cut materials, wherein the tip saw is provided so as to have a blade height higher or lower than a blade height of the cemented carbide tip disposed in the compartment. 2. The tip saw for cutting a difficult-to-cut material according to claim 1, wherein the convex base metal portion is divided into two first sections and two second sections, that is, four sections in total. A tipped saw for cutting difficult-to-cut materials. 3. The tip saw for cutting difficult-to-cut materials according to claim 1, wherein the tooth portion is formed by disposing a cemented carbide tip having a flat blade-shaped blade portion. A tipped saw for cutting difficult-to-cut materials. 4. The tip saw for cutting difficult-to-cut materials according to claim 1, wherein the tooth portion includes a cemented carbide tip having a flat blade-shaped blade portion and a super hard blade having a chamfered flat blade-shaped blade portion. A tip saw for cutting difficult-to-cut materials, characterized by being configured by being arranged in combination with a hard tip.