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Diamond cutting tool and manufacturing method thereof

The present invention relates to a diamond cutting tool and a manufacturing method thereof, and more particularly to diamond cutting tool which can be shortened in manufacturing time and prolonged in lifetime and a manufacturing method thereof.

In general, the diamond cutting tool has been used as a cutting tool for cutting a hard material such as stone, metal, concrete, and the like in the construction field or engineering works.

As a manufacturing method of the diamond cutting tool, there has been known a method in which a plurality of cutting segments that is manufactured by a blending, a forming, and a sintering of diamond particles and metal powders is welded around a body portion made of a high speed tool steel such as a carbon tool steel, a low carbon steel, and the like.

However, in such welding method, the processes of blending, forming, and sintering and the welding process for the cutting segments should be independently performed in the separate devices. This causes a problem of complicated manufacturing process so that manufacturing cost and time are increased.

In order to solve this problem, it has been developed an electro-deposition process by which diamond particles are deposited around the steel body portion.

FIGS. 1 to 3 show a conventional manufacturing method for cutting tools according to such electro-deposition process. First, as shown in FIG. 1, it is performed to arrange diamond particles 2 on a disc type steel body portion 1. Then, as shown in FIG. 2, it is performed to immerse the body portion 1 on which diamond particles 2 are arranged in a plating bath 3 filled with an electrolyte 5 such that a metal plate 4 installed in the plating bath 3 is positive-biased and the body portion 1 is negative-biased. Herein, the metal plate 4 is composed of a metal to be electro-deposited between the diamond particles 2 and the body portion, for example, Ni, Cu, Co, and so on, and the electrolyte 5 is a solution containing metal ions forming the metal plate 4.

As set forth before, when the body portion 1 is negative-biased and the metal plate 4 is positive-biased, the metal ions contained in the electrolyte 5 are reduced and precipitated on the negative-biased body portion 1. Although the metal ions in the electrolyte are exhausted through the precipitation, other metal ions are continuously supplied therein from the metal plate 4 through electrolysis, thereby acting on the reaction continuously. With the procedure of such reaction taking a sufficient time, as shown in FIG. 3, the diamond particles 2 are adhered to the body portion 1 through the electro-deposited metal 7.

However, according to this conventional manufacturing method, there was a problem in that it takes so much plating time in order to thicken a plating thickness for secure adhesion of the diamond particles. In addition, according to the conventional manufacturing method, there was another problem in that the diamond particles are moved to be in disarray in the course of electro-deposition of the diamond particles after the arrangement of the diamond particles on the body portion.

Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a diamond cutting tool in which the diamond particles are securely adhered to a disc type body portion and a manufacturing time is shortened, and a manufacturing method thereof.

Another object of the present invention is to provide a diamond cutting tool in which the diamond particles are coated with magnetic metal and a body portion is magnetized so that the diamond particles coated with metal are fixed to the magnetized body portion through a magnetic force therebetween, thereby preventing the diamond particles from being in disarray, and a manufacturing method thereof.

Still another object of the present invention is to provide a diamond cutting tool in which the diamond particles coated with metal are arranged in multi-layer using a magnetic force and electro-deposited on a body portion, thereby prolonging a lifetime of the cutting tools, and a manufacturing method thereof.

In order to accomplish the above objects, there is provided a method for manufacturing a diamond cutting tool, comprising the steps of:

coating the diamond particles with metal;

arranging the metal coated diamond particles on a region of a steel body portion intended to be used as a cutting edge;

immersing the body portion in a plating bath filled with an electrolyte; and

performing the electro-deposition in such a manner that the body portion is negative-biased and a separate metal plate installed in the plating bath for plating is positive-biased, thereby adhering the metal coated diamond particles to the body portion.

The diamond particles may be arranged in multi-layer and electro-deposited so that the diamond particles are thickened to prolong a lifetime of the cutting tool.

The metal coating the diamond particles may be iron or cobalt with excellent magnetic property. In case where the diamond particles are coated with the metal with excellent magnetic property, when the metal coated diamond particles are arranged on the body portion, the diamond particles can be fixed to the body portion by a magnetic force generated between the metal coating layer and the body portion through magnetization of the body portion.