JP2974697B2 - Sintered metal bond whetstone and method of manufacturing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sintered metal bond whetstone and a method for manufacturing the same.

[Conventional technology]

The grindstone layer of the sintered metal bond grindstone by the conventional technology is
The abrasive grains 2 are directly bonded with a binder of metal powder, or the abrasive grains 2 on which a pre-coated metal coating layer 5 is formed are embedded and bonded to a sintered metal bond layer 3 using metal powder as a binder. (See FIGS. 2 (a) and 2 (b)).

[Problems to be solved by the invention]

The sintered metal bond whetstone in which the abrasive grains according to the prior art are directly bonded with the binder of the metal powder has no adhesive force between the abrasive grains 2 and the sintered metal bond layer 3, and the surface of the whetstone is Abrasive grains 2 with little irregularities are sintered metal bond layer 3
Since the mechanical bonding is merely a fit into the concave portion, the holding force of the abrasive grains in the sintered metal bond layer 3 is weak, and the abrasive grains easily fall off during grinding.

Further, in the sintered metal bond whetstone in which the abrasive grains 2 on which the metal coating layer 5 which has been coated in advance is formed are bonded with a binder of the metal powder, the surface of the abrasive grains 2, that is, the surface of the metal coating layer 5 has irregularities. The mechanical bonding between the abrasive grains 2 and the sintered metal bond layer 3 is better than that of the abrasive grains 2 not coated with metal, but the affinity between the surface of the abrasive grains and the metal coating layer 5 is improved. , The holding power of the abrasive grains in the sintered metal bond layer 3 is weak at that point, and the abrasive grains 2 are also likely to fall off during grinding.

The present invention provides a bonding force between the abrasive grains and the sintered metal bond layer,
That is, an object of the present invention is to provide a sintered metal-bonded grindstone having a large holding force for abrasive grains and in which the abrasive grains hardly fall off during grinding, and a method for producing the same.

[Means for solving the problem]

The sintered metal bond grindstone according to the present invention includes a grindstone layer in which abrasive grains having a coating layer formed on the uneven surface of glass or ceramics are embedded and bonded by the sintered metal bond layer.

The method of manufacturing the sintered metal bond grindstone is such that glass or ceramic powder is adhered to abrasive grains of CBN or diamond, and the abrasive grains are heated and cooled to such an extent that irregularities remain in the powder adhered to the surface of the abrasive grains. Thus, coated abrasive grains are formed, and the coated abrasive grains and the metal powder are mixed and sintered to form a grindstone layer.

[Action]

In the sintered metal bond whetstone according to the present invention, the abrasive grains are coated with glass or ceramic having a higher adhesion than between the sintered metal bond layer, and further, because of the unevenness of the surface of the coating layer, the abrasive grains are coated. There is a strong mechanical bond between the layer and the sintered metal bond layer on the wheel core surface. As a result, the coated abrasive grains are firmly bonded to the grindstone core even if the amount of embedding in the sintered metal bond layer is small.

〔Example〕

A sintered metal bond grindstone according to an embodiment of the present invention will be described with reference to FIG.

The sintered metal bond grindstone has a coating layer 1 formed by coating a vitreous or ceramic.
N or diamond abrasive grains 2 are embedded and bonded in a sintered metal bond layer 3 formed by powder metallurgy using a metal such as copper, brass, nickel, iron or the like as a binder to form a grindstone layer, and the grindstone layer is desired. It is configured so as to be integrally connected to the surface of the shaped grinding wheel core 4.

The method of manufacturing the sintered metal bond grindstone described above is as follows. When the coating layer 1 is a glass coating, a glass powder is evenly attached to the peripheral surface of the abrasive grains 2 of CBN or diamond with a binder or the like. Is heated in a heating furnace to melt the glass and bring the glass into close contact with the abrasive grains, and then, when cooled, the abrasive grains 2 are covered with a glass coating layer 1 having irregularities formed on the surface. At this time, the heating time of the heating is adjusted so that the unevenness does not disappear.

When the coating layer 1 is a ceramic coating, a ceramic powder is used instead of the glass powder in the case of the glass coating, and the same processing as the glass coating is performed.

As described above, coated abrasive grains coated with glass or ceramics are obtained.

Then, a mixture of the coated abrasive and a metal powder such as copper, brass, nickel, and iron is filled in the space between the inner peripheral surface of the mold and the outer peripheral surface of the grindstone core 4 and then pressurized. Heating, ie sintering.

Thus, the coated abrasive grains having irregularities on the surface are embedded in the sintered metal bond layer 3 to be mechanically held firmly to form a grindstone layer, and the grindstone layer is integrated with the grindstone core.

When using the sintered metal bond grindstone manufactured as described above, dressing is performed, and the coated abrasive grains are partially exposed from the surface of the grindstone layer and used by dropping a part of the coating layer 1. .

〔The invention's effect〕

According to the method for manufacturing a sintered metal bond whetstone according to the present invention, the adhesion of the glass or ceramic powder having a higher adhesion than the metal to the abrasive grains of CBN or diamond, and the abrasive grains adhered to the surface of the abrasive grains Since the coated abrasive is formed by heating and cooling to such an extent that the powder has unevenness, the unevenness of the coating layer is largely formed in a relatively short time.

By mixing and sintering the coated abrasive grains formed as described above and the metal powder, in the grinding wheel layer, the coating layer having high adhesion of the coated abrasive grains has large irregularities, so that the coating layer and the coated powder are hardened. Since the mechanical holding force between the bonded metal bond layer has also been improved, as a result, the bonding force of the abrasive grains to the sintered metal bond layer has been subjected to metal coating on untreated abrasive grains or abrasive grains in advance Compared to the bonding of the abrasive grains with the sintered metal bond layer,
Much stronger.

Therefore, the abrasive grains are less likely to fall off during grinding, and the life of the sintered metal bond grindstone is prolonged.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a sintered metal bond grindstone according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are partial cross-sectional views of a sintered metal bond grindstone according to a conventional technique. 1: coating layer, 2: abrasive grains 3: sintered metal bond layer, 4: whetstone core

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-49-41994 (JP, A) JP-A-1-146664 (JP, A) JP-A-63-74568 (JP, A) JP-A-2- 243270 (JP, A) JP-A-1-97570 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B24D 3/06 B24D 3/00 330

Claims (2)

(57) [Claims] 1. A coating formed by adhering glass or ceramic powder to abrasive grains of CBN or diamond, heating the abrasive grains to such an extent that the powder adhered to the surface of the abrasive grains has irregularities, and then cooling. A sintered metal bond wheel comprising a wheel layer in which abrasive grains are embedded and bonded to the sintered metal bond layer. 2. A glass or ceramic powder is adhered to abrasive grains of CBN or diamond, and the coated abrasive grains are heated by heating the abrasive grains to such an extent that irregularities remain in the powder adhered to the surface of the abrasive grains, thereby cooling the coated abrasive grains. A method for manufacturing a sintered metal bond whetstone in which a whetstone layer is formed by forming, mixing and sintering the coated abrasive grains and metal powder.