JP3042415U - Tipped saw - Google Patents

Abstract

(57) [Abstract] [Purpose] An expensive cutting member such as a cutting diamond or CBN can be made small, and the attachment strength to the tip saw body is not reduced. [Constitution] By forming the cemented carbide 3 with a large thickness c,
The length b of the diamond 2 in the thickness direction is made longer than the length a in the direction of the surface of the diamond 2, so that the step portion 4 formed at a predetermined position of the tip saw body 10 has a length b. While securing a brazing area required for attaching the cutting edge tip 1, expensive diamond such as the diamond 2, CBN, etc. can be made into a small cutting member to reduce material cost and cost. To be able to

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a tip saw, and more particularly to a tip saw having an expensive cutting member such as diamond or CBN attached to the tip thereof.

[0002]

[Prior art]

 Conventionally, as a means for cutting a work material, a tip saw having an expensive cutting member such as diamond or Cubic Boron Nightlite (hereinafter, CBN) attached to its tip has been used. There are various types of tip saws.For example, a circular saw used to cut a hard work material has a cutting edge formed by attaching a cutting edge tip to a predetermined portion of the main body called a base metal. There is.

A diamond tip or CBN is used for the cutting edge tip, and the diamond tip or CBN is attached to a support made of cemented carbide to form a cutting edge tip.

As shown in FIG. 5 and FIG. 6, the conventional cutting edge tip 101 is integrated by, for example, placing a diamond 102 and a cemented carbide 103 in a mold and subjecting them to high temperature and high pressure for thermocompression bonding. It has become.

Then, the integrated diamond 102 and cemented carbide 103 are cut along a cutting line 104 to manufacture one cutting edge tip 101. As the cemented carbide 103, for example, a WC-CO type cemented carbide is used.

In FIG. 6, “a” indicates the length along the surface of the diamond 102, and “b” indicates the length along the thickness direction of the diamond 102. At a length b along the thickness direction of the diamond 102, the thickness of the diamond 102 layer is 0. It is about 5 to 1.5 m / m, and the thickness of the cemented carbide 103 layer is about 1 to 2 m / m.

When the diamond 102 and the cemented carbide 103 are subjected to thermocompression bonding at a high temperature and a high pressure, for example, a high temperature of about 1500 ° C. and a high pressure of about 70,000 atm are applied. The diamond 102 and the cemented carbide 103 are tightly integrated with each other so that the problem of peeling during cutting does not occur.

The cutting edge tip 101 configured as described above is brazed and attached to the tip saw body 100 as shown in FIG. That is, the step portion 110 having the horizontal brazing portion 110H and the vertical brazing portion 110V is formed at the cutting blade forming portion of the tip saw body 100.

In the case of the conventional cutting edge tip 101, since the length a along the surface of the diamond is long and the length b along the thickness direction is short, the horizontal brazing portion 110H is formed short and the vertical brazing portion 110H is formed. The attachment part 110V was formed long.

Then, the blade tip 101 is attached to the tip saw body 100 by being brazed to the horizontal brazing portion 110H and the vertical brazing portion 110V to the step portion 110.

The tip saw body 100 has various shapes, but the material thereof is steel having strength and flexibility. Therefore, when the blade tip 101 and the tip saw body 100 are brazed, the cemented carbide 103 and the tip saw body 100 are brazed.

By the way, since the diamond tip (or CBN) forming the cutting edge tip 101 is very expensive, the material cost can be saved and the cost can be reduced by reducing the size. Further, since the portion where the work material is actually cut is extremely small, it is possible to make the cutting edge tip 101 small without reducing the cutting force.

Further, although polishing is performed in order to regenerate the cutting force of the diamond 102 that has worn with use, the larger the diamond 102 is, the more polishing time is required. Therefore, from the aspect of maintenance as well. It was desired to make the diamond 102 as small as possible.

[0014]

[Problems to be solved by the device]

 However, if the diamond 102 is formed small, the brazing area with the tip saw body 100 is reduced. As described above, the cutting edge tip 101 is attached to the tip saw body 100 by brazing the cemented carbide 103, which is thermocompression-bonded with diamond, to the tip saw body 100 made of steel.

The expansion coefficient and contraction coefficient of the steel forming the tip saw body 100 are different from the expansion coefficient and contraction coefficient of the cemented carbide 103. Therefore, when the cutting edge tip 101 is attached, distortion and stress remain in the brazed portion between the cemented carbide 103 and the steel tip saw body 100. For this reason, if the blade saw body 101 and the cemented carbide 103 are made small in size by forming the blade tip 101 small, the attachment strength to the tip saw body 100 is reduced.

Therefore, in order to make the brazing area between the cutting edge tip 101 and the tip saw body 100 equal to or greater than a certain size, conventionally, the length a in the direction along the surface of the diamond is equal to or greater than a certain length. Therefore, there is a limit to reducing the size of diamond and CBN for cutting.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to make it possible to reduce the cutting diamond and CBN, and to prevent the attachment strength to the tip saw body from being lowered.

[0018]

[Means for Solving the Problems]

 The tip saw according to the present invention has a cutting edge tip 1 formed by integrating a diamond 2 and a cemented carbide 3 by thermocompression bonding by applying high temperature and high pressure, and a step portion 4 formed at a predetermined position of a tip saw body 10. In the tip saw formed by brazing, the blade tip 1 is formed by increasing the thickness c of the cemented carbide 3, so that the length b along the thickness direction of the diamond 2 is the diamond 2. Is longer than the length a in the direction along the surface of the diamond, and the area required for brazing the cutting edge tip 1 to the tip saw body 10 is the length along the thickness direction of the diamond 2. It is characterized in that it is ensured by lengthening the length b.

Another feature of the present invention is that the diamond 2 has a thickness of about 0. It is about 5 m / m, and the thickness of the cemented carbide 3 is about 4 to 7 m / m.

Another feature of the present invention is that a cutting edge tip 1 formed by brazing CBN and cemented carbide 3 together is formed on a predetermined portion of a tip saw body 10 at a step portion 4 In the tip saw formed by brazing, the blade tip 1 is formed by increasing the thickness c of the cemented carbide 3, so that the length b along the thickness direction of the CBN is the surface of the CBN. Is formed longer than the length a in the direction along, and the area required for brazing the cutting edge tip 1 to the tip saw body 10 is longer than the length b in the thickness direction of the CBN. It is characterized by being secured by doing so.

Another feature of the present invention is that the CBN has a thickness of about 0.5 m 2 / m, and the cemented carbide 3 has a thickness of about 4 to 7 m / m. Is characterized by.

[0022]

Since the present invention comprises the above technical means, the area required for brazing to the step portion 4 formed at a predetermined position of the tip saw main body 10 has a length along the thickness direction of the diamond 2 or CBN. Since it is ensured by lengthening b, even if the length a in the direction along the surface of the diamond 2 or CBN is shortened, the brazing strength for the tip saw body 10 does not decrease, and the attachment strength is reduced. It is possible to reduce the amount of use of the diamond 2 or CBN without lowering it.

[0023]

[Embodiment of the invention]

 Next, an embodiment of a tip saw of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a plan view of the tip saw according to the present embodiment. As shown in FIG. 1, the tip saw 20 of the present embodiment is configured by attaching the cutting edge tip 1 to the tip saw body 10, but it is more expensive than a conventional tip saw to use an expensive diamond or a diamond. We are reducing the amount of CBN used.

That is, as shown in FIG. 2, the cutting edge tip 1 of the present embodiment is integrated by thermocompression bonding the diamond 2 and the cemented carbide 3 by applying high temperature and high pressure. Then, the integrated diamond 2 and cemented carbide 3 are cut along a cutting line 24 to form the cutting edge tip 1.

When the diamond 2 and the cemented carbide 3 are thermocompression bonded, for example, a high temperature of about 1500 ° C. and a high pressure of about 70,000 atm are applied, whereby the diamond 2 and the cemented carbide are bonded. 3 and 3 are firmly integrated so as not to come off during cutting. As the above-mentioned cemented carbide 3, a cemented carbide such as a WC-Co type or a WC-Ti-Co type can be used.

Further, in the cutting edge tip 1 of the present embodiment, the cemented carbide 3 has a thickness of about 4 to 7 m / m, so that the length along the thickness direction of the diamond indicated by the symbol b in FIG. The length b is made long and the length a in the direction along the surface of the diamond is made short.

The cutting edge tip 1 of the present embodiment configured as described above is brazed to the step portion 4 formed in the tip saw body 10 as shown in FIG. The step portion 4 has a long horizontal brazing portion 4H and a short vertical brazing portion 4V corresponding to the shape of the cutting edge tip 1.

Therefore, in the tip saw of the present embodiment, the brazing area for the tip saw body 10 can be increased by increasing the length of the horizontal brazing part 4H, so that Even if the length a is shortened to reduce the amount of diamond used, a large brazing area can be secured.

Since the brazing area for the tip saw body 10 is increased in this way, the cemented carbide 3 and the tip saw body 10 have different expansion coefficients and contraction coefficients. Even if strain or stress remains between the tip saw body 10 and the tip saw body 10, the gap between them can be firmly attached.

Therefore, in the case of the tip saw according to the present embodiment, the amount of the diamond 2 constituting the cutting edge tip 1 can be reduced as much as possible, and the material cost can be saved.

Further, by making the diamond 2 small, the labor required for the polishing work for regenerating the cutting force can be significantly reduced, so that the cost and time spent for maintenance can be significantly reduced. it can. Although the diamond 2 is used as the cutting member in the above embodiment, CBN may be used instead of the diamond 2.

[0032]

[Effect of the invention]

 As described above, the present invention provides a tip saw having a step formed at a predetermined position of the tip saw body and brazed with a cutting edge tip constituted by integrating diamond or CBN and cemented carbide. Since the hard alloy was formed thicker and the length along the thickness direction of the diamond was formed longer than the length along the surface of the diamond, the cutting edge tip was set on the tip saw body. The area required for attachment can be satisfactorily secured even if the length along the surface of the diamond is made as short as possible. As a result, the length of the diamond or CBN in the direction along the surface can be shortened without lowering the brazing strength to the tip saw body.

This makes it possible to reduce the cost of materials by reducing the cost of expensive members such as diamond and CBN for cutting. Further, by reducing the diamond 2 and CBN, it is possible to reduce the polishing work to regenerate the cutting force, so that the cost and time spent for maintenance can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a tip saw showing an embodiment of the present invention.

FIG. 2 is a diagram showing how a cutting edge tip is formed.

FIG. 3 is a perspective view of a cutting edge tip.

FIG. 4 is a view showing how a cutting edge tip is attached to a tip saw body.

FIG. 5 is a diagram showing how a conventional cutting edge tip is formed.

FIG. 6 is a perspective view of a conventional cutting edge tip.

FIG. 7 is a diagram showing a main part of a conventional tip saw.

[Explanation of symbols]

 1 Cutting Edge Tip 2 Diamond 3 Cemented Carbide 4 Steps 4V Vertical Brazing Section 4H Horizontal Brazing Section 10 Tip Saw Main Body 20 Tip Saw a Length in the direction along the diamond surface b Length along the diamond thickness direction c Carbide Alloy thickness

Claims (4)

[Utility model registration claims] 1. A cutting edge tip 1 formed by integrating a diamond 2 and a cemented carbide 3 by thermocompression bonding by applying high temperature and high pressure to a step portion 4 formed at a predetermined position of a tip saw body 10. In the tip saw formed by attaching, the cutting edge tip 1 is formed to have a large thickness c of the cemented carbide 3, so that the length b along the thickness direction of the diamond 2 is along the surface of the diamond 2. Is longer than the length a in the direction, and the area required for brazing the cutting edge tip 1 to the tip saw body 10 increases the length b along the thickness direction of the diamond 2. The tip saw is characterized by being secured by the above. 2. The diamond 2 has a thickness of about 0.5 m.
/ M, and the thickness of the cemented carbide 3 is 4 to 7 m / m
The tip saw according to claim 1, wherein the tip saw is of a degree. 3. A tip saw formed by brazing a blade tip 1 formed by brazing CBN and cemented carbide 3 to a step portion 4 formed at a predetermined location of a tip saw body 10, wherein the tip tip 1 is formed by increasing the thickness c of the cemented carbide 3 so that the length b along the thickness direction of the CBN is longer than the length a in the direction along the surface of the CBN. The area necessary for brazing the cutting edge tip 1 to the tip saw body 10 is ensured by increasing the length b along the thickness direction of the CBN. A characteristic tip saw. 4. The tip saw according to claim 1, wherein the CBN has a thickness of about 0.5 m / m, and the cemented carbide 3 has a thickness of about 4 to 7 m / m. .