JPH0890425A - Blade - Google Patents

Abstract

PURPOSE: To prolong the service life of a blade chip by forming a part of a super abrasive particle layer in a structure having a part partically extended towards the inner circumferential side. CONSTITUTION: A super abrasive particle layer (chip) 2, 2A, which is sintered by mixing a diamond or a CBN abrasive particle with a metal powder, is formed on a steel base plate 1. The tip 2A is formed as a foot attached tip. A part extended toward the inner circumferential side of the base plate 1 is formed for demonstrating such effect as under head abrasion prevention. Mounting of the tip 2 and the foot attached tip 2A is not necessary to be alternate as shown in the example herein but the arrangement can be freely changed depending upon the length of the blade radius, application terms or the like. It can also be formed by combining with those having their foot length of the foot attached tip 2A shortened. Side resistance caused at the foot attached tip 2A and the cutting plane at the time cutting operation can be reduced by forming a grinding groove on the foot attached tip 2A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to stone, concrete,
The present invention relates to a blade having a super-abrasive grain layer such as diamond or CBN used for cutting various other members.

[0002]

2. Description of the Related Art A blade used for cutting hard and brittle materials such as stones and concrete is generally provided with a large number of kerfs 3 as shown in FIG. The layer chip 2 is joined to the substrate 1 by integral sintering, brazing or welding.

[0003]

With this type of blade, as the cutting operation progresses, chips cause the substrate portion below the chip joint to be scraped off, as shown in FIG. 2, and a phenomenon called so-called under-neck wear occurs. .

For this reason, although the abrasive grain layer can be used sufficiently,
There was a risk that the blade would become unusable and the tip would sometimes come off during use.

[0005]

All of the conventional superabrasive grain layer chips are formed in the same shape and shape of an arc, but the present invention partially extends a part of the superabrasive grain layer toward the inner peripheral side. The structure will have the part that

Not only can the abrasion resistance of the extended superabrasive grain layer portion prevent under-neck wear of the substrate, but also the adhesion area between the superabrasive grain layer and the substrate can be increased, and chip detachment can be eliminated.

At the time of cutting action, the plate thickness of the substrate should be made thin to provide a clearance on both sides of the superabrasive grain layer serving as a blade portion so as not to cause plate scraping in which the cut surface of the work material comes into contact with the substrate. I have to.

Therefore, there is a limitation in thinning the blade.

According to the present invention, a superabrasive grain layer extending to the inner peripheral side of the substrate is provided with abrasion resistance to prevent under-neck wear, and at the same time, a grinding effect is produced to obtain a good cut surface.

At the same time, the blade can be thin to the extent that no clearance is required.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below with reference to the drawings. Figure 3
FIG. 4 is a front view of a blade in one embodiment of the present invention, and FIG. 4 is a sectional view taken along line AA of FIG.

In FIG. 3, 1 is a steel substrate, and 2 and 2A are superabrasive grain layers obtained by mixing diamond or CBN abrasive grains with metal powder and sintering.

Reference numeral 2A is a chip (a chip with legs) having a superabrasive grain layer extended to the inner peripheral side of the substrate in order to prevent wear under the neck and to exert other effects.

In FIG. 3, the tip 2 and the legged tip 2A are alternately mounted, but the arrangement is not particularly limited, and the arrangement can be freely changed depending on the diameter of the blade, the use condition and the like.

Another embodiment is shown in FIG. In the present invention, the length of the leg portion of the legged tip is shortened from 2B to 2C, and the cost can be reduced by combining without providing the superabrasive layer portion more than necessary.

The side resistance at the time of cutting that occurs between the legged tip and the cutting surface has a reducing effect when the grinding groove 4 is provided in the legged tip.

[0017]

As described above, according to the present invention, by arranging the tip with leg on the blade, it is possible to prevent the wear under the neck and prolong the life until the tip is used up.

The chip is integrally sintered, welded or brazed to the substrate, but the legged chip has a large bonding area with the substrate and the bonding force increases accordingly, so that the chip does not come off.

Further, as described above, there is no problem even if the clearance is reduced to the necessary minimum at which the removal of chips is not obstructed, so that a thin blade which has never been obtained can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of a conventional blade.

FIG. 2 is a cross-sectional view of a main part showing a conventional under-neck wear state of a blade.

FIG. 3 is a front view of an embodiment of the present invention.

4 is a sectional view taken along line AA of FIG.

FIG. 5 is a front view of another embodiment of the present invention.

[Explanation of symbols]

 1 Substrate 2 Super Abrasive Grain Layer 3 Cutting Groove 4 Grinding Groove 2A, 2B, 2C Legged Tip

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuichiro Koguro 2-80 Hotorikitacho, Sakai City, Osaka Prefecture Osaka Diamond Diamond Industry Co., Ltd.

Claims (3)

[Claims] 1. A blade comprising a substrate having a plurality of kerfs formed on its circumferential surface and having superabrasive grains adhered to the outer peripheral end face of the substrate between the kerfs, wherein a portion of the superabrasive grain layer is directed toward the inner periphery of the substrate. A blade having at least one tip having an extended portion. 2. A blade having a tip according to claim 1, wherein the superabrasive grain layer portions extending toward the inner peripheral side of the substrate have different shapes or dimensions. 3. The blade according to claim 1, wherein a grinding groove is provided in the chip of the superabrasive grain layer extending toward the inner peripheral side of the substrate.