KR20030006793A - Diamond burs and manufacturing method thereof - Google Patents

Abstract

PURPOSE: Provided is a production process of diamond burs which applies a vacuum joint method to the diamond burs under vacuum or inert condition so that it contributes to improve the life span of the diamond burs remarkably. CONSTITUTION: The production process of the diamond burs is characterized by comprising the steps of: (i) using metallic welding alloy to heat diamond powder or isotropic boron nitride powder(3) to temperature where welding alloy of metal(2) forms liquid; and (ii) adhering diamond powder to the surface of the burs which consist of high solid materials, iron alloy or ceramics by welding alloy of liquid metal.

Description

Diamond-based tooth tool manufacturing method and the tooth tool manufactured by the same {Diamond burs and manufacturing method

The present invention provides a new method and a tool produced thereby, which greatly improves the lifespan by manufacturing diamond burs manufactured by various types of electroplating methods used to treat teeth in a different vacuum bonding method. It is about.

Dental tools used to treat teeth in dentistry come in various forms depending on the purpose of treatment. The use of these tools may be used to remove, or to correct, process, and cut a portion of an artificial tooth made of metal and ceramics overlaid on the removed tooth by grinding or cutting the tooth to be treated to the desired shape. It is a tool. Most of them are made of iron alloy or cemented carbide, but if necessary, electroplating method (called electrodeposition diamond) is used to make diamond tools with diamond particles attached to tool surface made of iron alloy and cemented carbide. Diamond is the hardest of any material present on earth, so it has the best properties for the processing of materials that make up teeth and artificial teeth. The production of the tool using such diamond properties has been produced by the electroplating method so far.

In the electroplating method, the raw metal to be coated is applied to the anode, and the product to be coated (plating) is used as a cathode. The raw metal to be coated is put in a solution where the coated metal can be melted to apply a voltage. It is a method of uniformly adhering to a product to be plated by dissolving it in a solution to be plated. The electroplating method is very easy and simple to process, but the problem of pollution due to waste solution is serious due to the use of strong acid or strong alkali to dissolve the solution. Above all, the coating layer is formed by the movement of charged particles. Bonding strength between products is very weak.

Diamond particles used in diamond-based tools have a size of about tens to hundreds of microns. Since diamond itself is a non-conductive material, it cannot be plated by diamond itself. Therefore, when electroplating, a suitable amount of diamond particles are mixed in the plating solution to move the metal cation to the product to be plated, and the diamond particles are also attached to the product when the coating is applied. Therefore, the diamond particles and the diamond particles are coated with iron alloy or cemented carbide material, i.e., the product without any chemical bonding, and the adhesion thereof becomes very weak.

When using the tool, the part that polishes or cuts the teeth is not the plated metal layer but the diamond particles attached to the plated layer, so that many abrasive loads are placed on the diamond particles. It is shortened.

The method of improving the weak adhesion of the electroplating method is to raise the temperature to the melting point where the welding alloy becomes a liquid phase by using a metal welding alloy and completely dissolve it. It is a method of making diamond particle adhere to it by making it react. Bonding between materials using a weld alloy of such metals is generally widely used for joining between metals, and this method is called a welding method. Representative welding methods are the simplest and widely used conventional torch method using oxygen and acetylene gas, in addition, induction heating method or advanced laser welding method. However, this conventional welding method is inadequate or impossible to attach tens of micron diamond particles to a product (shank) made of iron alloy or cemented carbide. In other words, the conventional welding method is easy to join the lumped material, and it is impossible to weld the tens of micron-size diamond powder uniformly to the shank. For example, in the case of a torch, tens of microns of diamond powder would be easily blown away by the torch. However, above all, the physical properties of the diamond itself make it impossible to weld the diamond powder by the conventional welding method.

Diamonds deteriorate rapidly when exposed to hot air. Therefore, although the diamond particles of several tens of microns are practically impossible on the surface of the product by the conventional general welding method, even if they are attached, the physical properties of the diamond particles are rapidly deteriorated, so that they cannot exhibit their performance. That is, the high temperature oxidation phenomenon will lose the excellent hardness properties of the diamond itself.

In the present invention, it is possible to weld the material in the form of a powder, and above all, to maintain the physical properties of the diamond and prevent the fall of the diamond particles to devise a new method of greatly improving the life.

In other words, in order to obtain a high adhesion to prevent the falling of the diamond particles, but using a metal welding alloy and a welding method, unlike the existing one is to manufacture a tool by applying a vacuum welding method that can be newly adjusted atmosphere. In particular, by using the physical properties that diamond has the best heat transfer ability, tens of micron diamond particles are welded in water in a vacuum or inert atmosphere for a rapidly heated heat source, the application of this manufacturing method It was possible to manufacture a tool that has more than 5 times the performance compared to the conventional one.

1 is a shape in which a welding alloy of metal is applied on a tool material

Figure 2 is a diamond tool immediately after the diamond powder is coated

<Description of the symbols for the main parts of the drawings>

①: Shank of a tool made of cemented carbide or iron alloy

②: welding alloy of metal

③: diamond powder or cubic boron nitride powder

The present invention is characterized by applying a welding method using a welding alloy of a metal without using an electroplating method in the manufacture of a diamond tool, in particular, it is characterized by bonding the diamond powder to the surface of the tool in a vacuum or inert atmosphere. .

The manufacturing method is very simple. First, a metal welding alloy (Fig. 1-②) is applied to a tool (Fig. 1-①) made of an iron alloy or cemented carbide material suitable for the purpose of treating teeth. Then, the diamond powder having a size suitable for the purpose of use is uniformly dispersed and coated on the welding alloy of the coated metal (FIG. 2). The tool in which the diamond particles are attached is placed in a device where the temperature is raised by a separate heat source to weld the metal. After the alloy is raised in vacuum (within 0.01 torr to 5 torr) or under an inert or reducing atmosphere such as hydrogen, nitrogen or argon (from 0.01 torr to atmospheric pressure) to the temperature at which the weld alloy of the metal forms a liquid phase Cool after a few minutes to complete the diamond tool.

Example 1

A metal welding alloy is applied to the surface of the tool made of cemented carbide. An average of 50 micron diamond particles are coated on the applied metal welded alloy with a thickness of about 0.1 mm. Then, the diamond particles are placed in a dryer maintained at 200 ° C. to fix the diamond particles to the surface of the tool made of cemented carbide. Put the tool in which the diamond particles are fixed in the chamber is maintained in a vacuum in which a separate heat source is present to increase the temperature to 800 ℃. At this time, the input in the welding machine in which the tool is inserted maintains 0.01 torr. In the case of maintaining a high vacuum of 0.01 torr or less, all the welding alloys in the liquid phase evaporate and the adhesion of the diamond particles drops sharply. If a low vacuum of 20 torr or more is maintained, the oxidation progresses due to the oxygen present in the vacuum, and the adhesion strength is sharply dropped. After raising to a temperature of 800 ℃ at a rate of 100 ℃ / min, and maintained for 2 minutes and cooled to complete the diamond tool welded diamond powder.

Example 2

A metal welding alloy is applied to the surface of the tool made of ferroalloy material. An average of 100 microns of diamond particles is coated on the applied metal weld alloy with a thickness of about 0.1 mm. Thereafter, the diamond particles are placed in a dryer maintained at 200 ° C. to fix the diamond particles to the surface of the tool made of an iron alloy. Put a tool in which diamond particles are fixed inside the welding machine in which a vacuum in which a separate heat source exists is maintained and raise the temperature to 800 ° C. At this time, the input inside the welding machine in which the tool is inserted is positioned at a high vacuum of 0.001 torr or less, and then nitrogen is maintained to maintain 1 torr. In the case of maintaining a high vacuum of 0.01 torr or less in a nitrogen atmosphere, all of the welding welds in the liquid phase evaporate and the adhesion of the diamond particles drops rapidly. In the case of using an inert atmosphere such as nitrogen, welding can be performed even if the pressure is maintained up to normal pressure (1 atm). After raising the temperature to 800 ° C. for 2 minutes and cooling, the diamond tool welded with diamond powder is completed.

Diamond burs manufactured by the conventional electroplating method (diamond burs) has a drawback of very short life due to the dropping of diamond particles easily during use. This is not due to the deterioration of the physical properties of the diamond particles, but only because the adhesion force is very weak, the diamond particles are easily dropped off the surface of the tool.

In the present invention, it is possible to greatly improve the life of the diamond tool by applying the vacuum welding method to the production of the diamond tool in a vacuum atmosphere or inert atmosphere using a metal welding alloy. In addition, there is no pollution caused by the waste solution inevitably generated during the production of diamond tool by the conventional electroplating method, it has a feature that can produce a tool with a greatly increased life by a very simple process.

Claims (2)

The diamond powder or cubic boron nitride-based powder is raised to a temperature at which the metal welding alloy forms a liquid phase by using a metal welding alloy, and the diamond powder is cemented by cemented carbide, iron alloy or ceramics by the metal welding alloy. Diamond-based tooth tools manufactured by joining to attach to the surface of tooth tools The welding place where the diamond powder adheres to the surface of the tool is made in a vacuum atmosphere, and the atmospheric pressure is from 0.01 torr to 20 torr, or the atmospheric pressure is 0.01 using an atmosphere of nitrogen, argon or hydrogen. Vacuum joining method from torr to normal pressure.