KR101186088B1 - Manufacturing method of formation metal - Google Patents

Abstract

The present invention relates to a metal used as a part of a mobile phone or an automobile, and in particular, it is low in weight and excellent in tensile strength, and has excellent elastic modulus and hardness. Of course, the moldability is excellent.
For this purpose, a small amount of beryllium is added while copper and nickel are used as the main materials in the state of aluminum, thereby producing a desired metal.
In addition, these main materials, subsidiary materials, and beryllium by various content changes to excellent molding at low temperatures, but also to provide a variety of products with different tensile modulus, elasticity and hardness.

Description

Manufacturing method of molded metal with excellent injection molding. {Manufacturing method of formation metal}

The present invention relates to a metal used as a part of a mobile phone or an automobile, and in particular, it is low in weight and excellent in tensile strength, and has excellent elastic modulus and hardness as well as changing only the content of the metal to be mixed so that the hardness can be strongly or weakly controlled. Of course, the moldability is excellent.

Recently, various types of die-casting methods are manufactured by injection molding using materials having excellent elasticity and excellent hardness while requiring low weight in mobile phone or automobile parts.

Such materials use titanium, which is known to be excellent in hardness and elasticity, but the disadvantage of these materials is that they are expensive, resulting in increased product cost.

Therefore, recently, various shapes are manufactured by injection molding by die casting using a material called liquid metal, which is formed of an alloy in which various metals are mixed with titanium as a main material.

However, the liquid metal has a lot of problems in manufacturing as it requires a vacuum at the time of molding and also melts at a high temperature.

Therefore, in the present invention, the molding is excellent and light at room temperature without additional molding conditions, and if the excellent tensile strength, as well as the elastic modulus and hardness is to produce a metal that can change the desired properties freely.

For this purpose, a small amount of beryllium is added while copper and nickel are used as the main materials in the state of aluminum, thereby producing a desired metal.

In addition, these main materials, subsidiary materials, and beryllium by various content changes to excellent molding at low temperatures, but also to provide a variety of products with different tensile modulus, elasticity and hardness.

Therefore, as the molding is injection-molded by the general die casting method, various shapes can be realized, as well as easy to manufacture, and easy to collect, and can be reused repeatedly, without corrosion, lightness, and material cost. Because it is not expensive, it can be used as an eco-friendly material.

1 is a manufacturing process diagram of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, aluminum, which is the main material used in the present invention, is a silver-white soft metal, rich in malleability and ductility, and has a melting point of 660 ° C, a boiling point of 2060 ° C, a density of 2.698 g / cm 3, It has a cubic structure, and the mechanical properties vary depending on purity, processing amount, heat treatment, etc., but the strength is increased by work hardening as the cold working rate increases, ductility is lowered, and softened by annealing.

In addition, when the alloying element is added, more hardened aluminum can be obtained by solid solution strengthening, precipitation hardening, or the like.

At the same time, copper and nickel, which are the submaterials, have a characteristic red luster and have a specific gravity of 8.96, a melting point of about 1083 ° C, excellent malleability, ductility, workability, and strength. There is also.

The conductivity of heat and electricity is the second largest after silver, and the crystal is equiaxed. It is possible to prevent oxidation when it is made of aluminum and alloy which oxidizes in air but has excellent corrosion resistance.

Nickel is a silver-white gloss metal with a specific gravity of 8.90 and a melting point of approximately 1452 ° C. It can be forged and annealed like iron, and is rich in malleability and ductility, and can also be polished. Do. Strong magnetic, but weaker than iron.

In addition, a small amount of beryllium added is a silver-white metal, which has a specific gravity of 1.85, a melting point of about 1300 ° C., oxidizes the surface in air, and forms a coating to turn grayish white. It is soft at room temperature, but at high temperatures, it is malleable and ductile. Toughness, electrical conductivity, and elasticity are also great. Its chemical properties are similar to magnesium, but similar to aluminum. It is not eroded by water. Hydrochloric acid, sulfuric acid, etc., generate hydrogen and dissolve well, but they do not dissolve well in nitric acid. Hydrogen also generates hydrogen and melts.

When the main material and the subsidiary material are mixed, they are cut and used to facilitate melting in the form of solids, and an important technical idea of the present invention is to cast while sequentially melting from melting at high temperatures used in general casting. Rather than the reverse order, that is, the order of melting is sequentially added from the low melting point, the input timing is to be added in addition to the melting point to reach the melting point is sequentially added and mixed.

In the present invention, aluminum is first melted and then the appropriate melting point (approximately 660 ° C.), that is, when the crystal material is heated, its temperature rises and when it reaches a certain temperature, it starts to liquefy and maintains the same temperature until all melts. Copper is injected into the car, and the injected copper reaches the melting point as the melting starts, and the beryllium is injected into the third phase while watching the mixing process of the copper with the molten aluminum. While watching the process of mixing with copper, the fourth step is to add nickel again and the melting is started and the molten aluminum or copper and beryllium is melted in the process of reaching the melting point is mixed with nickel.

In the case of tapping the molten mixture, the molten mixture is introduced into a constant ingot mold, and the mold is separated after 30 minutes to form a solid ingot that can be cast.

At the time of casting, the melting point temperature of nickel should be lower than the boiling point temperature of aluminum. If the melting point of nickel (1452 ℃) is higher than the boiling point of aluminum (2060 ℃), the aluminum will boil and change of properties. Can be generated.

The reason why aluminum is used as a main material is that it is inexpensive and there is no problem in supplying raw materials, and by adding other materials to aluminum, strength, viscosity, and ductility can be obtained.

As a result, the main material is to provide the desired material in the present invention by mixing the aluminum, copper and nickel and beryllium as the main material in order by using a different melting point in order to melt.

The following shows an embodiment according to the mixing ratio.

Example 1

43.62 wt% aluminum

25.34 wt% copper

Nickel 30.25 wt%

Beryllium 0.79 wt%

The highest strength can be obtained and the elastic modulus can be obtained at the highest level in the mixed state in the above-described molten state.

Example 2

51.62 wt% aluminum

20.17 wt% copper

Nickel 27.07 wt%

Beryllium 1.14 wt%

In the mixed state of the above content it was possible to obtain a strong strength and a semi-elasticity than the normal strength.

Example 3

Aluminum 59.15 wt%

16.52 wt% copper

Nickel 22.83 wt%

Beryllium 1.50 wt%

Standard strength and standard elasticity were obtained in the mixed state.

The standard strength here is to push the general strength, the tensile strength is about 1500, the elastic modulus is 1.7, the hardness is about 500, and the weight is about 150.

In addition, it can be seen that the more aluminum, copper, and nickel is contained, the lower the strength and elastic modulus, and the more beryllium is added to compensate for the lower strength and elasticity.

The following is a comparison of the tensile strength, modulus, hardness and weight of titanium, magnesium, aluminum, plastic, liquid metal and the material of the present invention by standard.

Tensile strength (mpa)

Modulus of elasticity (% of original shape)
Longitude (hv)
Strength / weight
titanium

770
0.65
350
170
magnesium

170
0.4
100
80
aluminum

245
0.7
150
90
plastic

50
2.0
15
45

Liquid metal

1900
2.0
550
310
Invention

1500
1.7
500
150

1: 2;
3;

Claims (2)

delete Aluminum was sequentially melted with aluminum having a composition ratio of 43.62 to 59.15 wt%, copper having a composition ratio of 16.52 to 25.34 wt%, beryllium having a composition ratio of 0.79 to 1.50 wt%, and nickel having a composition ratio of 22.83 to 30.25 wt%. In the state that the copper is added at the melting point of the copper to melt the beryllium at the melting point of the beryllium, and finally, the nickel is injected at the melting point of the nickel to melt and then cast molding method with excellent injection molding to be cast. .

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