JPH0453899Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an improvement plan for a diamond wheel.

[Conventional technology]

Diamond wheels are often used to cut new materials such as various fine ceramics and cermets. This diamond wheel is made by bonding diamond abrasive grains to the outer periphery of a disc-shaped substrate using a bonding agent and integrally molding a diamond cutting blade. Metal bond and resin bond are generally used as the bonding agent. .

However, metal bond has strong abrasive grain retention and wear resistance, so it has a long service life.
During cutting, the high pressure applied to the abrasive grains may push the abrasive grains into the bond, or the abrasive grains may remain in the bond even if the cutting edge wears out and loses its cutting ability.
This causes the wheels to become clogged or clogged. This reduces the cutting ability of the wheel and causes curvature and even breakage of the wheel, requiring frequent dressing during cutting to sharpen the abrasive grains.

Resin bond has a large amount of wear due to the cutting layer,
Although new abrasive grains appear one after another, the cutting ability is excellent, but the tool life is short, making it unsuitable for cutting fine ceramics etc. due to the economical nature of the tool.

On the other hand, wheels using vitrify-in-bond have both of the above-mentioned advantages, and can provide good cutting performance and long life. That is, it has strong abrasive grain retention and high rigidity, and has appropriate abrasion, so that it does not become clogged or clogged like a metal bond does, and it does not wear excessively like a resin bond. In terms of wear resistance, it is equivalent to or better than metal bond. Therefore, in terms of characteristics, it can be said to be the most suitable for the above-mentioned cutting work, but on the other hand, since the substrate is made of ceramic, it is extremely weak in terms of strength, and if the thickness of the wheel becomes thin, There is also the problem that it is easily damaged during the manufacturing process. In particular, it has been considered impossible to manufacture slitting blades with a wheel width of 1 mm or less, which is required for cutting fine ceramics.

Therefore, the purpose of this invention is to improve the vitrified bond diamond wheel and provide a diamond wheel that is optimal for cutting fine ceramics and the like in terms of strength and cutting characteristics.

[Means for solving problems]

In order to achieve the above objective, this invention has a structure in which the substrate is formed of a vitrified structure containing 5 to 20% by volume of non-ferrous metal powder, and a metal core material is embedded inside the substrate. It is.

In the diamond wheel constructed as described above, the high toughness of the non-ferrous metal powder greatly increases the toughness of the vitrified structure, improving the flexibility of the substrate, and incorporating a metal core material embedded inside. As a result, it acts as a reinforcing material for the substrate, greatly improving its breakage resistance.

〔Example〕

An embodiment of this invention is shown in the attached drawings.

The diamond wheel 1 shown in the figure is a disk-shaped substrate 2 with a mounting hole 4 in the center, and a diamond layer 3 serving as a cutting blade is integrally provided on the outer periphery of the substrate 2.
Both the substrate 2 and the diamond layer 3 are made of the same bitrified material, and are integrally formed by hot pressing.

The diamond layer 3 is bonded with diamond abrasive grains 5 almost uniformly mixed in the vitrified bond, and during cutting, the surface abrasive grains are scraped off and new abrasive grain surfaces are gradually exposed. It's starting to come out.

The substrate 2 is made of a vitrified structure whose base material is continuous with the diamond layer 3, and contains nonferrous metal powder therein. The content of the powder is preferably set within a range of 5 to 20% in volume ratio to the entire substrate 2. As for the type of powder, one that has good meltability with the vitrified structure is used, such as copper.

Furthermore, a metal plate 6 having a large number of through holes 7 provided throughout the entire surface is embedded inside the substrate 2 . This metal plate 6 is embedded simultaneously when the substrate 2 is molded in the mold. By providing a large number of holes on the entire surface of the plate 6 in this manner, the vitrified structures on both sides of the plate 6 flow through the holes 7 during molding, and a uniform and even wheel can be formed. . Note that the thickness of the metal plate 6 is desirably set in a range of 1/5 to 1/2 of the thickness of the substrate 2.

Further, instead of the metal plate 6, a metal net or a metal mesh may be used. Particularly when the thickness of the wheel becomes thinner, it is easier to embed the fiber-like material, and it is possible to embed it uniformly over the entire substrate 2.

Further, the metal of the core material is preferably iron or a material with a higher melting point than iron. In other words, due to the molding heat generated when the substrate and the diamond cutting blade are integrally molded using a hot press, and the cutting heat during the cutting operation,
This is to prevent the metal from melting or burning out.

〔effect〕

As described above, according to this invention, the flexural strength of the substrate is greatly improved by using a metal object as the core material, and since a large amount of highly tough non-ferrous metal powder is mixed into the substrate, Improves overall flexibility and provides high strength against bending stress.

Therefore, it is possible to prevent breakage during use to a large extent, and it is also possible to manufacture thin wheels, which was previously difficult. (diameter 100mm),
A vitrified bond diamond wheel that can sufficiently withstand cutting loads was obtained.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of this invention;
FIG. 2 is a sectional view of the same as above. 1...Diamond wheel, 2...Substrate, 3
...Diamond layer, 5...Diamond abrasive grain,
6...Metal plate.

Claims (1)

[Claims for Utility Model Registration] (1) A diamond wheel in which a diamond cutting blade is formed by bonding diamond abrasive grains to the outer periphery of a disk-shaped substrate using a vitrified bond, the substrate is A diamond wheel characterized in that it is formed of a vitrified structure containing non-ferrous metal powder and that a metal core material is embedded inside the substrate. (2) The diamond wheel according to claim 1, wherein the core material is a perforated plate.