KR100571542B1 - How to manufacture wear resistant machinery parts - Google Patents

Abstract

The present invention relates to a method for producing a wear resistant mechanical part. In the manufacturing method of the present invention, in the method of bonding a cemented carbide and a metal base material to produce wear-resistant mechanical parts, the step of mixing the hard particles of carbide or nitride or boride and the binder powder containing nickel, silicon and boron Wow; Molding the mixed hard particles and the binder powder; Sintering the molded body by simultaneously heating the contacted molded body and the metal base material at a temperature of 1300 ° C. in the air, and simultaneously bonding the sintered body and the metal base material to each other; And slowly cooling the joined sintered body and the metal base material in air. According to the present invention, by rapidly heating the hard particles, the binder and the base material at 1300 ° C. in the air, the hard particles and the binder can be sintered in the air, and the sintered sintered body can be joined to the metal base material. In particular, by enabling the formation of the sintered body in the air and the joining of the sintered body and the metal base material, expensive vacuum equipment is not required, and thus, equipment investment cost is low. In addition, since the sintering and joining time is drastically reduced, manufacturing time can be shortened and manufacturing cost can be reduced. In addition, it is possible to line through the conveyor to enable mass production of wear-resistant mechanical parts.

Description

Abrasion Resistant Machine Part Manufacturing Method {METHOD OF PRODUCING CONSUME RESISTING MACHINE PART}

1 is a block diagram showing a method for manufacturing a wear-resistant mechanical part according to the present invention,

2 is a block diagram showing another embodiment of a method for manufacturing a wear-resistant mechanical part according to the present invention.

The present invention relates to a method for producing a wear-resistant mechanical part, and more particularly, to a method for manufacturing a wear-resistant machine part for forming a cemented carbide layer on a metal base material to be used in a frictional contact requiring wear resistance.

The cemented carbide is composed of hard particles such as carbides such as tungsten carbide and chromium carbide, nitrides and borides, and metal-based binders, and is widely used in machine parts requiring excellent wear resistance and high tool resistance.

In order to use such cemented carbide as a mechanical part (hereinafter referred to as “wear-resistant mechanical part”), the hard particles and the binder are mixed, the mixed mixture is molded into a desired shape, and the molded body is formed at a constant temperature. After heating to prepare a sintered body, the prepared sintered body is used after bonding to a metal base material (hereinafter, abbreviated as "base material") such as an iron-based alloy.

Here, the sintering step of forming the molded body into a sintered body and the joining step of joining the manufactured sintered body to a metal base material should be performed in a vacuum atmosphere. This is because, if the sintering step and the joining step are performed in the air, tungsten oxide in the molded product is oxidized, and the molded product is not sintered and joined properly.

In addition, when the sintering process and the bonding process are performed in the air, bubbles existing between the hard particles and the binder in the molded body and between the sintered body and the metal base material remain as they are and remain as pores after the process. By performing the sintering process and the joining process, bubbles existing between the hard particles and the binder and between the sintered body and the metal base material can be taken out and removed.

On the other hand, the conventional wear-resistant mechanical parts manufacturing method, the sintering process for producing a molded body into a sintered body, and the joining process for joining the manufactured sintered body to a metal base material should be carried out in a vacuum atmosphere, so in order to implement such a process ( It is pointed out that the need for a high vacuum equipment. This disadvantage has to be equipped with expensive vacuum equipment, there is a problem that takes a lot of equipment costs.

In addition to this, the vacuum equipment needs to make the conditions inside the vacuum chamber, that is, the vacuum degree inside the chamber and the heating temperature inside the chamber, at an optimum vacuum degree and temperature for sintering the molded body and joining the sintered sintered body to the metal base material. As a result, it takes a lot of time and a lot of energy. This disadvantage causes a delay in the production time of the wear-resistant mechanical parts, and also increases the manufacturing cost. In particular, the production time is delayed and the production cost is increased, thereby lowering the productivity.

In addition, a method of manufacturing wear-resistant mechanical parts through vacuum equipment is also pointed out disadvantages that are inadequate for mass production of wear-resistant mechanical parts because it is impossible to line through a conveyor.

 Accordingly, the present invention has been made to solve the above problems, and an object thereof is to provide a method for producing a wear-resistant mechanical part capable of sintering a molded body in the air, and joining the sintered sintered body to a metal base material. .

Another object of the present invention is to provide a method for producing a wear-resistant mechanical part that does not require expensive vacuum equipment by sintering a molded body in the air and bonding the sintered sintered body to a metal base material.

Another object of the present invention is to provide a wear-resistant mechanical parts manufacturing method that can reduce the equipment investment cost by not requiring expensive vacuum equipment.

Another object of the present invention, because it does not take a separate time and energy to make the vacuum equipment in an optimal state, it is possible to shorten the production time, as well as manufacturing wear-resistant mechanical parts that can reduce the manufacturing cost To provide a way.

It is still another object of the present invention to provide a wear-resistant mechanical part manufacturing method that enables mass production of wear-resistant machine parts by enabling line through a conveyor.

In order to achieve the above object, the wear-resistant mechanical part manufacturing method of the present invention is a method of manufacturing a wear-resistant mechanical part by joining a cemented carbide and a metal base material, the hard particles of carbide or nitride or boride and nickel Mixing the binder powder containing silicon and boron; Molding the mixed hard particles and the binder powder; Bonding the sintered body and the metal base material at the same time by rapidly heating the contacted molded body and the metal base material in the air at a temperature of 1300 ° C. for 30 seconds or more within 3 minutes; And slowly cooling the joined sintered body and the metal base material in air.

Another manufacturing method of the present invention comprises the steps of bonding a cemented carbide and a metal base material to produce wear-resistant mechanical parts, comprising the steps of: laminating hard particles of carbide, nitride or boride on a metal base material to a predetermined thickness; Stacking a binder powder containing nickel, silicon, and boron on the hard particle layer to a predetermined thickness; Rapidly heating the metal base material, the hard particle layer, and the binder layer at a temperature of 1300 ° C. for 30 seconds or more within 3 minutes to sinter the hard particles and the binder layer, and simultaneously join the sintered body and the metal base material; And slowly cooling the joined sintered body and the metal base material in air.

Hereinafter, preferred embodiments of the wear-resistant mechanical part manufacturing method according to the present invention will be described in detail with reference to the accompanying drawings.

      First, as shown in FIG. 1, the manufacturing method of the present invention includes hard particles, which are raw materials of cemented carbide, and a binder powder, which is a binder, and mixes the provided powder (S101). Herein, the hard particles include carbides such as tungsten carbide, chromium carbide, nitrides, borides, and the like, and the binder powder includes metal powders such as cobalt, nickel (Ni), silicon (Si), boron (B), and the like. Carbon (C), iron (Fe), and the like.

On the other hand, when the step of the mixing process is completed, the step of forming a mixed powder into a molded body (S103). Molding step (S103) is a compression molding of the mixed powder, the step of molding to have a shape suitable for the portion of the base material to be bonded.

When the molding step (S103) is completed, the molded body and the base material are brought into contact with each other, and the contacted molded body and the base material are rapidly heated at a temperature of 1300 ° C. in the air (S105). The rapid heat treatment step (S105) is a step of rapidly heating the molded body and the base material in contact with each other at a temperature of 1300 ° C. in the air, thereby sintering the molded body and simultaneously bonding the sintered molded body and the base material.

On the other hand, the rapid heat treatment step (S105) by rapidly heating the molded body and the base material in contact with each other at a temperature of 1300 ℃ in the air, to prevent the oxidation of tungsten oxide in the molded body even if the sintering process and the bonding process in the air, and thus the molded body Sintering can be made smoothly.

In other words, when the molded body is heated in the air, the tungsten oxide in the molded product may be oxidized. Therefore, the molded product is heated to the sintering temperature using a temperature (1300 ° C.) as high as possible, but rapidly within a short time (about 1 minute). By heating, it sinters, preventing the tungsten oxide in a molded object from being oxidized beforehand.

In addition, the rapid heat treatment step (S105) is a rapid heating of the molded body and the base material in contact with each other at 1300 ℃ temperature in the air, even if the sintering process and the bonding process in the air between the hard particles and the binder in the molded body, the molded body and the metal The bubbles existing between the base materials can be taken out and removed to the outside, and thus the sintering of the molded body and the joining of the sintered body and the base material can be made smoothly.

That is, when the molded body and the base material are heated in the air, bubbles existing between the hard particles and the binder in the molded body and between the molded body and the metal base may remain and remain as pores. By heating the molded body by using a rapid heating within a short time (about 1 minute), the binder in the molded body has a fluidity in a liquid state in a moment, so that the binder having sufficient fluidity in the molded body and the molded body and the metal base material Bubbles existing in between will be enough to be discharged to the outside.

As a result, this rapid heat treatment step (S105), by rapidly heating the molded body and the base material in contact with each other at a temperature of 1300 ℃ in the air, even if the sintering process and the bonding process in the air is performed, the sintering of the molded body and the bonding between the molded body and the base material Make it smooth.

On the other hand, in this rapid heat treatment step (S105), the heating time is appropriate for 30 seconds or more and less than 3 minutes depending on the size and shape of the cemented carbide sintered body. When the heating time is 30 seconds or less, sufficient sintering is not performed. When the heating time is 3 minutes or more, the binder powder and the bonding base material may react to dissolve the bonding base material.

On the other hand, this rapid heat treatment step (S105) is carried out through a high frequency induction heating apparatus. A high frequency induction heating apparatus is a device that heats a specific portion of a heating material to a high temperature in a short time by using a high frequency current, and can safely heat rapidly without environmental pollution. In particular, since only a specific portion of the heating material can be heated rapidly, it is possible to line through the conveyor, and the cost is low, thus making the facility equipment investment cost low.

In addition, the high frequency induction heating apparatus can start and stop instantaneously, and thus can shorten working time and shorten working time, thereby improving productivity.

In addition, it is also possible to rapidly heat a molded object and a base material using a laser irradiation apparatus instead of the high frequency induction heating apparatus. A laser irradiation apparatus is a device which irradiates a laser to heat a specific part to be heated, and is a device which can heat a specific part to high temperature in a short time. Since the high frequency induction heating apparatus and the laser irradiation apparatus are already known techniques, detailed description thereof will be omitted.

Referring back to FIG. 1, in the manufacturing method of the present invention, after the rapid heat treatment step (S105), the bonded base material and the sintered body (hereinafter referred to as “wear resistance machine parts”) are gradually cooled at room temperature (S107), The cooled wear-resistant mechanical part is machined (S109).

In the cooling step S107, the base material and the sintered body joined to each other are slowly cooled in air.

And the machining step (S109) is made with high precision by machining and polishing the inner and outer surfaces of the wear-resistant mechanical parts.

As described above, the wear-resistant mechanical parts manufactured through various steps are joined with high strength. In addition, since it is manufactured in the atmosphere, it can be manufactured in large quantities in a short time.

On the other hand, the inventor tried to produce a wear-resistant mechanical part by the production method of the present invention, and tested the hardness of the manufactured wear-resistant mechanical parts. According to this,

(Example 1)

A groove having a width of 10 mm, a length of 100 mm, and a depth of 20 mm was formed in a carbon steel base material, and tungsten carbide powder as a hard particle and nickel alloy powder as a binder were mixed and molded into the groove formed. Then, the base material loaded with the hard particles and the binder was heated at a temperature of 1300 ° C. for 1 minute using a high frequency induction heating apparatus, and after heating, was slowly cooled in air.

As a result, the slow cooled hard particles and the binder were sintered to form a cemented carbide, and the cemented carbide was bonded to the base metal with high bonding. In addition, the hardness of the formed cemented carbide was measured with a value of HRA 84 or more.

Next, FIG. 2 is a block diagram showing another embodiment of a method for manufacturing a wear-resistant mechanical part according to the present invention.

Unlike the above-described embodiment in which the hard particles and the binder are mixed with each other, the manufacturing method of another embodiment laminates the hard particles with a predetermined thickness on the base material (S101), and then deposits the binder binder powder on the substrate with a predetermined thickness. (S103).

When the lamination of the hard particle layer and the binder layer is completed, the base material and the hard particles and the binder laminated on the base material are rapidly heated at a temperature of 1300 ° C. for 1 minute in the air (S105). Of course, the rapid heat treatment step (S105) is carried out through a high frequency induction heating apparatus or a Jayzer irradiation apparatus.

When the rapid heat treatment step S105 is completed, the bonded base material and the sintered body (hereinafter referred to as “wear-resistant mechanical parts”) are gradually cooled at room temperature (S107), and the cooled wear-resistant mechanical parts are machined. (S109).

Another embodiment of the manufacturing method having these steps. Since the hard particles and the binder are laminated without mixing, the working time can be shortened. In addition, since the hard particles and the binder are laminated, a separate molding operation is not necessary, and thus the working time can be shortened.

On the other hand, the inventor tried to produce a wear-resistant mechanical parts by the manufacturing method of another embodiment, and tested the hardness of the manufactured wear-resistant mechanical parts. According to this,

(Example 2)

A groove having a width of 10 mm, a length of 100 mm, and a depth of 20 mm was formed on the base material of carbon steel, and 10 mm of tungsten carbide powder as hard particles was laminated on the formed groove, and 10 mm of nickel-silicon-boron alloy powder as a binder was laminated thereon. In addition, the base material, on which the hard particles and the binder were laminated, was heated at a temperature of 1300 ° C. for 1 minute using a high frequency induction heating apparatus, and after heating, was slowly cooled in air.

As a result, the slow cooled hard particles and the binder were sintered to form a cemented carbide, and the cemented carbide was bonded to the base metal with high bonding. In addition, the hardness of the formed cemented carbide was measured with a value of HRA 84 or more.

As a result, the wear-resistant mechanical parts manufactured by the manufacturing method as described above have been shown to have high hardness, excellent wear resistance and excellent impact resistance.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope of the claims.

As described above, the wear-resistant mechanical part manufacturing method according to the present invention, by rapidly heating the hard particles, the binder and the base material at 1300 ℃ in the air, it is possible to sinter the hard particles and the binder in the air, and It is possible to join the sintered body to the metal base material. In particular, by enabling the formation of the sintered body in the air and the joining of the sintered body and the metal base material, expensive vacuum equipment is not required, and thus, equipment investment cost is low. In addition, since the sintering and joining time is drastically reduced, manufacturing time can be shortened and manufacturing cost can be reduced. In addition, it is possible to line through the conveyor to enable mass production of wear-resistant mechanical parts.

Claims (4)

In the method of bonding a cemented carbide and a metal base material to produce a wear-resistant mechanical parts, Mixing hard particles of carbide or nitride or boride and a binder powder containing nickel, silicon and boron; Molding the mixed hard particles and the binder powder; Bonding the sintered body and the metal base material by sintering the molded body by rapidly heating the molded body and the metal base material in the air at a temperature of 1300 ° C. for 30 seconds or more within 3 minutes; A method for producing a wear-resistant mechanical part, comprising the step of slow cooling the joined sintered body and the metal base material in air. The method of claim 1, Rapid heat treatment of the sintered body and the metal base material, the wear-resistant mechanical component manufacturing method characterized in that the rapid heating by a high frequency induction heating apparatus. The method of claim 1, The rapid heat treatment of the sintered body and the metal base material may include rapid heating by a laser irradiation apparatus. In the method of bonding a cemented carbide and a metal base material to produce a wear-resistant mechanical parts, Laminating hard particles of carbide, nitride or boride to a predetermined thickness on the metal base material; Stacking a binder powder containing nickel, silicon, and boron on the hard particle layer to a predetermined thickness; Rapidly heating the metal base material, the hard particle layer, and the binder layer at a temperature of 1300 ° C. for 30 seconds or more within 3 minutes to sinter the hard particles and the binder layer, and simultaneously join the sintered body and the metal base material; A method of producing a wear-resistant mechanical part comprising the step of slow cooling the joined sintered body and the metal base material in air.

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