JPH04357292A - Abrasion-proof member - Google Patents

Abstract

PURPOSE:To use an abrasion-proof member using hard bar material such as refractory metal for a long time, and enable the arrangement of different kinds of material. CONSTITUTION:An abrasion-proof member 3 consists of multiple metal pipes 1, in which a hard bar material 2 such as refractory metal is brazed, collected and unified as an aggregate. Brazing is used as a method for unification, but in the case of the pipes 1, diffused junction and welding can be applied. In the case that this abrasion-proof material 3 is applied to blade tip member such as bit, the pipe 1 part is worn first, and auto-blade-generating work by self sharpening is obtained.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to wear-resistant members using hard rod materials such as cemented carbide, particularly cutter bits, core drill bits, cutting saws, surface finishing blades for concrete and tiles, and wear-prevention members. It is designed so that it can be applied to, etc.

0002

[Prior Art] Conventionally, wear-resistant members using hard rods of cemented carbide have been manufactured using core metal made of cemented carbide, polycrystalline diamond on the inner periphery of cermet, or composite chips sintered under ultra-high pressure. etc. For example, the former involves embedding a cemented carbide core in the matrix of the bit to form a specific cutting edge shape, as in Japanese Utility Model Publication No. 61-29832, while the latter involves brazing a composite chip onto the cutting edge of the drill bit. Japanese Patent Laid-Open No. 59-224795 and the like are disclosed.

0003

[Problem to be Solved by the Invention] However, in the former type of wear-resistant member, if a high-hardness cemented carbide with an HRA of 89 or higher is used, thermal cracks due to brazing distortion will occur if the brazing area is large. There were problems that occurred.

[0004] Furthermore, in the latter type of wear-resistant member,
Since it is sintered under ultra-high pressure, there are restrictions on size and it becomes expensive.

In view of the above, the present invention has been improved so that it can be applied even to highly hard cemented carbide members and is not limited in size.

[0006]

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to form a block-shaped aggregate by bundling metal pipes in which hard rods such as cemented carbide are inserted. The object of the present invention is to provide a wear-resistant member in which the assembly is integrated by being exposed to a brazing atmosphere. Therefore, the hard bars are brazed to each other at their abutting surfaces within the pipes. In this case, the pipes may be joined by diffusion bonding or welding as appropriate.

[0007]

[Operation] The wear-resistant member of the present invention is constructed as an assembly of hard rods such as cemented carbide through metal pipes, so it is less affected by thermal distortion such as brazing. be. Therefore, even high-hardness cemented carbide can be applied.

Furthermore, when the wear-resistant member of the present invention is applied as a cutting edge member for a bit, etc., the metal pipe wears out first, and has the function of forming a self-sharpening blade by self-sharpening.

[0009]

[Embodiment] An embodiment of the wear-resistant member of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, numeral 1 has a hard bar material 2 made of cemented carbide, cermet, or ceramic inside.
These are metal pipes that are brazed together, and the wear-resistant member 3 is constructed by integrating this assembly. In this case, the wear-resistant member 3 is illustrated as being finished into a predetermined shape, but the metal pipe 1 is made of 50% Fe-
50% Ni (wt%) is applied, and the hard bar 2 is
For example, a cemented carbide (HRA92 equivalent to M20) with a diameter of 3.17 mm x 3.9 mm is used. And this pipe 1
The hard bar 2 is brazed into the inside by placing a brazing material 4 on top, as shown in FIG. 4, for example. Also,
When bundled to form an aggregate, this aggregate is
For example, they are aligned in a carbon container (not shown), placed in a brazing atmosphere, such as a continuous hydrogen furnace, together with a brazing material (not shown) placed on top of the assembly, and brazed.

As a result, the hard rod 2 is brazed within the pipe 1, and the pipes 1 are integrated by brazing their abutting surfaces, resulting in a block-shaped wear-resistant structure. Part 3 is obtained. After cooling, the obtained wear-resistant member 3 is cut as necessary and finished into a predetermined shape by making the length of the pipe 1 and the length of the hard bar 2 equal. Next, the wear-resistant member 3 finished into a predetermined shape is applied as a blade member of a cutter bit, core drill bit, cutting saw, or the like. Also, surface finishing blades for concrete, tiles, etc.
Applicable to wear prevention members, etc.

[0012] The hard bar 2 is usually made of a round bar, but the shape of the pipe 1 is as shown in Figs. 1 to 3.
As shown in the figure, various shapes such as circular, square, and hexagonal cross sections can be applied. Further, as for the arrangement of the hard rods 2, generally they are of the same material, but if necessary, a combination of different materials with different hardnesses, compositions, etc. can be selected as appropriate.

[0013]

[Effects of the Invention] As explained above, in the present invention, a wear-resistant member 3 is constructed by brazing a hard bar 2 into a metal pipe 1 and integrating these assemblies. This has the following effects.

[0014] As the hard bar 2, high hardness cemented carbide or cermet can be used, so a long service life can be expected. This is because the hard bar 2 of the present invention can be of a small diameter, and the outer circumference is covered by the metal pipe 1, which reduces brazing distortion. ■ Distributing the hard bar 2 Therefore, when used as a cutting edge member, the impact force applied to the cutting edge is also dispersed to the individual hard bars 2, and the impact force is also absorbed and alleviated by the pipe.

■ Manufacturing of the hard bar 2 reduces internal defects during sintering. This is advantageous in the case of large sintered bodies, where internal defects may develop.

(2) The wear-resistant member 3 is also easy to manufacture. This is because a metal pipe 1, a hard rod 2, a brazing material 4, etc. are prepared, arranged in a carbon container, and exposed to a brazing atmosphere. In this case, various shapes can be obtained by appropriately designing the internal shape of the container.

[0017] When used as a cutting edge of a bit, etc., the pipe 1 portion wears out first, and a self-sharpening edge is made possible by self-sharpening of the hard bar 2. This means that sand and rock can be excavated for a long time, improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the wear-resistant member of the present invention;

FIG. 2 is a perspective view showing another embodiment;

FIG. 3 is a perspective view showing another embodiment;

FIG. 4 is a cross-sectional view illustrating the arrangement of brazing filler metal with respect to a pipe and a hard bar.

[Explanation of symbols]

1 Metal pipe 2 Hard rod shape 3. Wear-resistant parts

Claims (2)

[Claims] Claim 1: A block-shaped assembly is formed by bundling metal pipes with hard rods such as cemented carbide inserted therein, and this assembly is exposed to a brazing atmosphere. A wear-resistant member characterized in that the hard bar material is integrated within a pipe by brazing the pipes at their contact surfaces. 2. A wear-resistant member characterized in that the hard bar according to claim 1 is brazed within a pipe, and the pipes are integrated by diffusion bonding or welding.