KR102049886B1 - A Foaming Method for Titanium Alloy Component - Google Patents

Abstract

The present invention relates to a method for forming a titanium alloy component, the composition of which comprises a first step of cutting a titanium material into a predetermined shape, a second step of blasting the surface of the cut material, and a coating liquid on the material. A third step of coating, a fourth step of hot forming the material, a fifth step of cooling the material at room temperature, a sixth step of blasting the surface of the material, and an acid treatment of the material And an eighth step of measuring an alpha case on the surface of the material.

Description

A Foaming Method for Titanium Alloy Component

The present invention relates to a titanium alloy component molding method, and more particularly to a titanium alloy component molding method in which the formation of the alpha case layer is minimized.

Generally, titanium casting is used for precision casting of titanium alloys and composites.

Titanium is known as a universal solvent in the molten state, which causes an interfacial reaction with the mold due to its strong reactivity during casting of the titanium alloy.

That is, the oxygen decomposed in the template is dissolved into the invasive atoms to form a reaction layer called an alpha case.

Since the alpha case is a fragile region that adversely affects mechanical properties, it requires post-processing such as chemical milling using strong acid to remove it, which causes environmental problems, cost increase, and dimensional accuracy deterioration.

Patent Publication No. 10-2011-0040104

In order to solve the above problems, it is an object of the present invention to provide a method for forming a titanium alloy component in which the formation of an alpha case is minimized.

In order to achieve the above object, the titanium alloy molding method of the present invention, the first step of cutting the titanium material into a predetermined shape, the second step of blasting the surface of the cut material and the coating liquid on the material A third step of coating the material, a fourth step of hot forming the material, a fifth step of cooling the material at room temperature, a sixth step of blasting the surface of the material, and an acid treatment of the material And a seventh step and an eighth step of measuring an alpha case on the surface of the material.

The coating solution may include aluminum, a binder, and a viscosity modifier.

The coating solution is characterized in that 15 to 40 parts by weight of the binder, 150 parts by weight of the viscosity modifier are mixed with respect to 100 parts by weight of aluminum.

The titanium alloy molding method according to the present invention has the following effects.

By forming a protective coating layer before the heat treatment to minimize the thickness of the forming layer of the alpha case to minimize the amount of material removed to reduce the manufacturing cost, there is an advantage that can minimize the damage of the mold.

1 is a flow chart showing a method of forming a titanium alloy component according to the present invention.
Figure 2 is a block diagram showing a blasting device of the titanium alloy component forming apparatus according to the present invention.
3 is a view showing a photo of the microstructure by Comparative Example 1 of the molding method of FIG.
4 is a view showing a photo of the microstructure according to Example 1 of the molding method of FIG.
5 is a view showing a picture of the microstructure according to Example 2 of the molding method of FIG.
6 is a view showing a picture of the microstructure according to Example 3 of the molding method of FIG.
7 is a view showing a picture of the microstructure according to Example 4 of the molding method of FIG.

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

As shown in FIG. 1, the method of forming a titanium alloy component according to the present invention includes a first step S1 of cutting a titanium material into a predetermined shape, and a second step S2 of blasting the surface of the cut material. A third step (S3) of applying a coating solution to the material, a fourth step (S4) of hot forming the material, a fifth step (S5) of cooling the material at room temperature, and a surface of the material And a sixth step S6 of blasting, a seventh step S7 of acid treating the material, and an eighth step S8 of measuring an alpha case on the surface of the material.

First, in the method of forming a titanium alloy component according to the present invention, a first step S1 of cutting a titanium material into a predetermined shape is performed.

Cutting of the titanium material may use a variety of cutting devices, in the present invention can be used a laser cutting device.

In addition, a second step S2 of blasting the surface of the cut material is performed. The blasting step is a process for smoothing the surface of the material.

Next, a third step (S3) of applying a coating solution to the material is carried out. Application of the coating solution to the material is to minimize the generation of an oxide layer by the oxidation reaction on the surface of the titanium material during hot forming to be described below.

The coating solution of the material may be used in various ways, in the present invention, the coating solution may be a mixture containing aluminum, a binder and a viscosity modifier.

It is preferable that the said aluminum uses aluminum particle, and the surface apply | coats stearic acid. The binder may be an alkyd resin, and the alkyd resin may include metal naphtenate.

The coating solution further includes a viscosity modifier. The viscosity modifier may be toluene (toluene) or xylene (Xylene). The toluene may be used when forming a thin coating layer, the xylene may be used when forming a thick coating layer.

It is preferable to mix 15-40 weight part of binders, and 150 weight part of viscosity modifiers with respect to 100 weight part of aluminium in the said coating liquid. When the amount of the binder is small, the adhesive strength is weak, and when the amount is large, bubbles are generated a lot, which causes other problems.

In addition, a fourth step S4 of hot forming the material is performed. The molding is carried out at a high temperature of 900 ℃, the material is placed in a mold for 1 hour.

When the hot forming is finished, a fifth step S5 of cooling the formed material is performed. The material is cooled at room temperature, and the surface of the material is coated with alumina (Alumina oxide, Al2O3) to block the reaction with the outside air.

When the cooling is finished, a sixth step S6 of blasting the surface of the material proceeds. This is to remove the alpha case layer, which is an oxide layer formed on the surface of the material.

The blasting apparatus may be configured in various ways, in the present invention may be configured as follows.

As shown in FIG. 2, the blasting apparatus includes a body part 10 having a predetermined space sealed therein, a sliding support part 20 moving horizontally in one direction while supporting a material from below, and the A first nozzle portion 30 provided above one side of the material and sprayed and processed with alumina oxide toward the material direction, and a second nozzle provided above the other side of the material and sprayed and processed with alumina oxide toward the material direction. A part 40 and a tilting part 50 provided below the sliding support part 20 to incline the sliding support part 20 toward the first nozzle part 30 and the second nozzle part 40. It can be configured to include.

First, the blasting apparatus of the present invention is provided with a body portion 10. The body portion 10 is provided with a predetermined space therein, and provides a space in which the material to be blasted is loaded.

The sliding support 20 is provided inside the body 10. The sliding support 20 serves to move the material horizontally in one direction while supporting the lower side of the material.

The first nozzle part 30 is provided above one side of the sliding support part 20. The first nozzle part 30 serves to inject alumina oxide toward the material from one side surface of the material seated on the upper surface of the sliding support 20.

The second nozzle part 40 is provided above the other side of the sliding support part 20. The second nozzle part 40 serves to inject alumina oxide toward the material from the other side of the material seated on the upper surface of the sliding support 20.

In addition, the first nozzle part 30 and the second nozzle part 40 may be horizontally slid so as to be orthogonal to the moving direction of the sliding support part 20. This is to spray evenly on both sides of the material seated on the sliding support (20).

In addition, the sliding support 20 may be further provided with a tilting unit 50. The tilting part 50 is to allow both sides of the sliding support 20 to move up and down, so that the aluminum oxide is sprayed to the side and bottom of the material to be contacted. To this end, the sliding support 20 may be configured in a mesh.

The first nozzle part 30 and the second nozzle part 40 may include a plurality of nozzles, and the directions of the nozzles may be arranged in a zigzag manner. This is to allow the alumina oxide to be evenly sprayed on the front surface of the material.

The blasted pigment material is subjected to acid treatment (S7). The acid treatment completely removes foreign substances on the surface.

Then, after washing the acid-treated material is subjected to alpha case measurement on the surface of the material, it is determined whether the defect (S8).

Hereinafter, the experimental details on the change of the alpha case according to the coating amount of the coating layer in the titanium alloy component molding method according to the present invention will be described in detail.

Comparative Example 1

It proceeds from the first step to the fifth step of the above-described process, it is a result of measuring the alpha case by molding without applying the coating layer at all.

Example 1

It proceeds from the first step to the fifth step of the above process, it is the result of measuring the alpha case by applying the coating layer once and molding.

Example 2

The same as in Example 1, the coating is applied three times to form and then the result of measuring the alpha case.

Example 3

The same as in Example 1, the coating is applied by molding five times and then the result of measuring the alpha case.

Example 4

The same as in Example 1, the coating is applied 7 times, and the result of measuring the alpha case.

Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Thickness before coating (mm) 4.070 ~ 4.085 4.080 ~ 4.090 4.185 ~ 4.195 4.190-4.195 4.060 ~ 4.075 Thickness after coating (mm) 4.070 ~ 4.085 4.095-4.105 4.215-4.220 4.265-4.270 4.170 ~ 4.190 Thickness change (mm) 0.000-0.000 0.015 ~ 0.015 0.030-0.025 0.075-0.075 0.110-0.115 Alpha Case (㎛) 19.4 20.8 18.0 18.3 24.7

As shown in Table 1, there is no general correlation between the application of several layers of the coating liquid and the thickness of the alpha case layer, and in Examples 2 and 3, the thickness is relatively thin compared to the case where no coating liquid is applied. It was confirmed that the thickness appeared. That is, the coating liquid is preferably applied three to five times.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive, and the scope of the present invention is indicated by the following claims rather than the above description, and the meanings and ranges of the claims and their equivalent concepts. All changes or modifications derived from the invention should be construed as being included in the scope of the present invention.

10: body portion 20: sliding support
30: first nozzle part 40: second nozzle part
50: tilting part

Claims (3)

A first step of cutting the titanium material into a predetermined shape;
Blasting the surface of the cut material;
A third step of applying a coating solution to the material;
A fourth step of hot forming the material;
A fifth step of cooling the material at room temperature;
A sixth step of blasting the surface of the material;
A seventh step of acid treating the material; And
And an eighth step of measuring an alpha case on the surface of the material.
The coating liquid,
15 to 40 parts by weight of the binder and 150 parts by weight of the viscosity modifier are mixed with respect to 100 parts by weight of aluminum,
The aluminum is used by applying stearic acid to the surface of the aluminum particles,
The binder is an alkyd resin containing naphthalene metal,
The viscosity modifier,
Toluene is used to make the coating layer thin. Using xylene, the coating layer can be thickened to control the thickness of the coating layer.
Method for forming a titanium alloy component, characterized in that the coating solution is applied 3 to 5 times.

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