JPS63123674A - Manufacturing method for diamond tooth of circular saw - Google Patents

Abstract

PURPOSE:To make grinding sand of diamond to adhere strongly on a metal disk, by applying pressure to a pile of solder, grinding sand layer of diamond, solder and another metal disk on the main surface of a metal disk so as to sandwich said pile between carbon components in a vacuum, and heating said pile with electric current. CONSTITUTION:After soldering flux 6a and solder 7a are spread or piled in order on the main surface of a Ni metal disk 5a a ring-shaped grinding sand layer 8 of diamond with a certain width is formed on the rim of the disk 5a. And on this, solder 7b, soldering flux 6b and a Ni alloy disk are piled up in order. This pile is put into a carbon 2 and pressure over its top with carbon cover 3. At the same time, electric voltage is applied between the carbon pan 2 and the carbon cover 3, and Joule's heat is generated to soften the Ni alloy disks 5a, 5b in a vacuum and to thrust the grinding sand of diamond into the Ni alloy disks 5a, 5b, which are completely with the solders 7a, 7b and the two Ni alloy disks 5a, 5b are soldered up with the solders 7a, 7b in one piece.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method for manufacturing a diamond circular saw blade, particularly a thin blade.

(Prior art and its problems) Generally, in a diamond circular saw blade, a thin diamond layer is formed on the peripheral edge of a metal disc called a base metal. To form this diamond layer, diamond abrasive grains are mixed with a powder bond material (for example, metal bond such as bronze), and the mixture is put into a mold together with a metal base and fixed by applying heat and pressure.

However, with this method, the adhesion of the diamond layer was relatively weak, and it was difficult to manufacture thin blades.

(Objective of the Invention) The present invention provides a method for manufacturing a diamond circular saw blade which has a thin blade and in which diamond abrasive grains are embedded in a base metal and firmly adhere to the blade.

(Structure of the Invention) After sequentially applying or placing a brazing agent and a brazing material on one main surface of a metal disk, a ring-shaped diamond abrasive grain layer having a predetermined width is formed on the peripheral edge of the first disk. death.

Furthermore, a brazing material, a soldering agent, and a metal disk are stacked in this order, or an annular structure having a predetermined width is formed on the periphery of both main surfaces of the metal disk.

A diamond abrasive grain layer containing a brazing agent is formed, and a brazing material is layered on the outside of the diamond abrasive grain layer, which is sandwiched between carbon members and pressurized in a vacuum or an inert gas atmosphere.

The carbon member is heated by electricity, and the diamond abrasive grains are fixed and integrated with the peripheral edge of the metal disk.

(Example) Embodiments will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which 1 is a vacuum chamber, 2 and 3 are a saucer and a lid made of carbon, and a secondary coil 4 for energization is connected thereto. Reference numerals 5a and 5b are Ni alloy plates having a thickness of, for example, 0.2 mm, which serve as base metals, and are punched in advance into a disk shape with a mounting hole in the center and a slit for cooling. 6a and 6b are soldering agents (flux), which are actually applied to one main surface of the Ni alloy plates 5a and 5b. 7
a, 7b are brazing materials (for example, silver solder), which are punched out into a disc shape and have a thickness of 0.1 cm, or powder; 8 is a diamond abrasive grain layer arranged in a ring shape with a predetermined width; in reality, Brazing material 7a.

Coated on top of 7b.

That is, on one main surface of the Ni alloy plate 5a, the brazing agent 6a,
After sequentially applying or placing the brazing filler metal 7a, an annular diamond abrasive grain layer 8 having a predetermined width is formed on the peripheral edge of the disk, and the brazing filler metal 7b is further applied thereon.

The brazing agent 6b and the Ni alloy plate 5b are stacked in this order. This stacked material is placed in a carbon tray 2, and a carbon lid 3 is placed on top of it to hold it down and pressure is applied. At the same time, a voltage is applied between the carbon tray and the lid, generating Joule heat due to electricity. This pressurization and heating are performed in a vacuum atmosphere. Note that the purpose of performing this in a vacuum atmosphere is to prevent oxidation due to heating, and therefore, it may be performed in an inert gas atmosphere.

In the above method, the amount of current is gradually increased while applying pressure, and the Ni
The heating is stopped before the alloy plates 5a and 5b are heated and melted. There, the diamond abrasive grains bite into the softened Ni alloy plate, and the brazing material covers it without any gaps. Two Ni alloy plates 5a at the same time.

5b are brazed together with a brazing material.

FIG. 2 shows a diamond circular saw blade manufactured in this manner, and 9 is a portion where the diamond abrasive grains enter into the Ni alloy plate and are integrated until they emerge from the surface of the Ni alloy plate. Reference numeral 10 denotes a slit previously provided in the Ni alloy plate, which is effective in dissipating heat by spraying cooling water when using the saw blade, and is also effective in eliminating cutting debris. Therefore, it is possible to prevent the cutting edge from bending and cutting due to a rise in temperature.A material made of two thin plates stuck together as in this embodiment is much stronger than one made of a single material.

FIG. 3 shows another embodiment of the present invention. In this case, one Ni alloy plate 5 is used, and an annular diamond abrasive grain layer 8 having a predetermined width is formed on the periphery of both sides together with a brazing agent, and a brazing material 7 is formed on the outside thereof. Cover it with

Pressurize and heat as in the embodiment shown in FIG. In this case as well, the diamond abrasive grains bite into the inside of the Ni alloy plate 5, and the top thereof is covered with the brazing material. Therefore, the adhesive force of diamond abrasive grains is extremely strong, and a thin diamond circular saw blade can be manufactured. Note that it can be applied not only to thin blades but also to some thick blades (for example, 1.0 mm).

In addition, in the embodiment, a Ni alloy metal plate was used as the metal plate as the base metal, but the present invention is not limited to this. Furthermore, the brazing material is not limited to silver soldering material.

(Effects of the Invention) As described above, the present invention has the advantage that it is possible to obtain a diamond circular saw blade in which the adhesion of diamond abrasive grains is extremely strong and the blade is extremely thin.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a manufacturing method according to an embodiment of the present invention;
This figure shows a diamond circular saw blade manufactured by the same method, and FIG. 3 is a diagram showing the main part of a manufacturing method according to another embodiment of the present invention. 1...Vacuum chamber, 2...Carbon saucer, 3...
Carbon lid, 4...Secondary coil. 5, 5a, 5b -Ni alloy plate, 6a, 6b
- Brazing agent, 7, 7a, 7b... Brazing metal, 8...
・Diamond abrasive layer. Patent Applicant Rizo Nishimura Nippon Casting Co., Ltd. Figure 1 Island Manday...Odor tank 2...〃-Ninhi plate 3...Car rack-7-4... Secondary 4L 5a, 5b-NL&Ik* Of course, 6b... Rowa bu side 7a, 7b... Ro n

Claims (1)

[Claims] (a) On one main surface of a metal disc of desired thickness, a brazing agent,
After sequentially applying or placing the brazing material, a ring-shaped diamond abrasive grain layer having a predetermined width is formed on the periphery of the disc, and then the brazing material, brazing agent, and metal disc are further applied in this order. (b) An annular diamond abrasive grain layer containing a brazing agent having a predetermined width is formed on the periphery of both main surfaces of the metal disk, and further, the diamond abrasive grain layer is A layer of brazing filler metal is layered on the outside, which is sandwiched and pressurized between carbon members in a vacuum or an inert gas atmosphere, and the above carbon members are heated by applying electricity,
A method for manufacturing a diamond circular saw blade, characterized by fixing and integrating diamond abrasive grains to the peripheral edge of a metal disc.