KR101035976B1 - Manufacturing method of aluminum header-pipe using binder flux for braze of non-clad aluminum material - Google Patents

Abstract

PURPOSE: A method for manufacturing an aluminum header pipe using non-clad aluminum brazing binder flux is provided to prevent refrigerant leakage and pressure reduction since an aluminum header pipe and a connection part are welded by brazing binder flux. CONSTITUTION: A method for manufacturing an aluminum header pipe using non-clad aluminum brazing binder flux comprises the following steps. A header pipe of a cylindrical shape is formed through a drawing process(S100). Communicating holes are formed on one side of a header pipe at regular intervals by a press(S200). A burning process is performed on a header pipe(S300). A header pipe is cleaned and is dried in a drying room for 20-40 minutes(S400). The brazing binder flux is applied and dried on the communicating hole of the header pipe(S500). The brazing binder flux is formed of aluminium alloy.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing an aluminum header pipe using a binder flux for a non-clad aluminum material for brazing,

The present invention The present invention relates to a method of manufacturing an aluminum header pipe using a non-clad aluminum binder flux for brazing, and more particularly, to a method of manufacturing an aluminum header pipe for a vehicle or an electronic product, The present invention relates to a method of manufacturing an aluminum header pipe using a binder flux for brazing of a non-clad aluminum material so as to reduce costs.

Generally, components such as a radiator, a condenser, an evaporator, a heater, and an oil cooler used in a heat exchanger used in a vehicle such as an automobile, It is a well-known fact that an aluminum material is heated and adhered for the purpose of improving thermal conductivity and emissivity.

However, if you try to braze the existing aluminum material, you must use aluminum material clad material on the aluminum base material.

That is, when the aluminum material is brazed in a furnace at about 600 ° C., the clad material attached to the surface of the aluminum base material acts as a binder to melt and bond itself to the aluminum base material while chemically reacting with heat, Is strongly coupled.

At this time, if the aluminum base material is not coated with the clad material, the aluminum materials can not be heat-bonded to each other, which makes it difficult to produce a heat exchanger using an aluminum material.

However, the method of coating the surface of the aluminum base material with the clad material is complicated and difficult, and even if it is used in advanced countries, it is not competitive. Therefore, most of the countries including Korea import the products of the advanced countries And the like.

As a result, there has been a problem that the cost of the finished product increases as well as the waste of the foreign currency nationwide, thereby causing the competitiveness of the product to deteriorate.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to simplify a work process of an aluminum header pipe installed at a place where a cooling of a vehicle or an electronic product is required, and to reduce costs.

It is another object of the present invention to provide a non-clad aluminum alloy binder flux for bonding a connection part of an aluminum header pipe and a coupling part, thereby preventing a problem that may occur in a connection part.

In order to achieve the above object, there is provided a method of manufacturing a header pipe, comprising the steps of: forming a header pipe having a cylindrical shape through a drawing process; pressing a press on one surface of a header pipe formed through the header pipe forming step, A head pipe forming step of forming a header pipe connecting hole for forming the communication holes; a header pipe processing step for performing a burning process on the header pipe formed through the header pipe communication hole forming step; A header pipe washing and drying step in which the post-washed header pipe is dried in a drying chamber at a temperature of 90 ° C to 110 ° C for 20 to 40 minutes, a brazing fast made of a brazing powder and a nocorro flux and a non-clad aluminum material The binder flux for brazing is subjected to washing and drying of the header pipe, In was coated in a direction the communication hole of the header pipe drying said non-characterized by comprising an header pipe brazing flux binder coating step of drying the binder resin breaker flux of clad aluminum.

According to the present invention, it is possible to simplify the work process of an aluminum header pipe installed in a place where cooling of a vehicle or an electronic product is required, and reduce the cost.

In addition, it is possible to prevent problems such as leakage of coolant, reduction of pressure, safety accident, and the like, which may occur at the connection portion by fusion of the connection portion of the aluminum header pipe and the coupling part with the binder flux for the non-clad aluminum material have.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing a method of manufacturing an aluminum header pipe using a binder flux for brazing of a non-clad aluminum material according to the present invention.
2 is a perspective view of a header pipe manufactured by a method of manufacturing an aluminum header pipe using a binder flux for brazing of a non-clad aluminum material according to the present invention.
3 is a front view showing an embodiment using the header pipe of FIG. 2 according to the present invention.

1 is a flowchart illustrating a method of manufacturing an aluminum header pipe using a binder flux for non-clad aluminum brazing according to an embodiment of the present invention, and FIG. 2 is a cross- 3 is a perspective view of a header pipe manufactured by a method of manufacturing an aluminum header pipe using a non-clad aluminum alloy binder flux for brazing according to the present invention. Fig.

The non-clad aluminum alloy binder flux 10 for brazing according to the present invention comprises a brazing fast made of a brazing powder and a no-coke flux, and a binder solvent.

The brazing powder constituting the brazing fast serves as a clad, the nocorro flux serves as a molten material of aluminum, and the binder solvent serves as a solvent for lubrication of the brazing powder.

Next, in the present invention, the composition of the brazing fast and the binder solvent is composed of the following weight% and weight part, as follows: when the non-clad aluminum brazing binder flux It is possible to reduce the cost due to the process of fusion or brazing.

First, when the non-clad aluminum brazing binder flux is constituted by weight%, it is composed of 45 to 60 wt% of the brazing powder, 15 to 25 wt% of the nocorro flux, and 20 to 30 wt% of the binder solvent .

At this time, it can be seen that instead of the brazing powder, silicon powder or zinc powder can be used instead.

When the non-clad aluminum brazing binder flux is composed of a weight part, the brazing fast is composed of 15 to 60 parts by weight, and the binder solvent is 10 to 70 parts by weight.

In this case, the brazing fast powder is a mixture of K + Al + F ₄ or Zn + Al + F ₄ , and the brazing fast powder is composed of Al (86-96 parts by weight) 14 to 16 parts by weight) or Zn (8 to 16 parts by weight), and the binder solvent is a mixture of acrylic resin (1 to 30 parts by weight) and methanol and butanol (70 to 99 parts by weight).

≪ Example 1 >

A binder flux 10 for a non-clad aluminum brazing material composed of 55% by weight of a brazing powder, 20% by weight of a noncorrosive flux, and 25% by weight of a binder solvent is prepared, The binder flux 10 is applied to the surface of the aluminum material not coated with the clad material by means of a spray or a roller and then brazed at a temperature of 550 ° C to 630 ° C for 20 to 30 minutes using a heat exchanger, Cool.

≪ Comparative Example 1 &

Conventional aluminum material coated with clad material

<Experimental Example>

Example 1 and Comparative Example 1 constituted as described above were subjected to tensile strength tests of Example 1 and Comparative Example 1 mounted on radiators for automobiles and automobile heaters after application of the automobile radiator and automobile heater respectively Experimental data values as shown in Tables 1 and 2 below were obtained.

Automotive Radiator Tensile Strength Results Example 1 Comparative Example 1 3.0 kg / cm 2 ○ △ 3.5 kg / cm 2 ○ X 4.0 kg / cm 2 ○ X

Tensile strength results for automotive heater Example 1 Comparative Example 1 3.0 kg / cm 2 ○ △ 4.0 kg / cm 2 ○ X 5.0 kg / cm 2 ○ X

In the above Tables 1 and 2, X represents a state where the aluminum material to be brazed is completely separated when the tensile pressure is applied, And ∘ represents a safe state where there is no abnormality when tensile pressure is applied.

As can be seen from the above Tables 1 and 2, the aluminum material brassed using the non-clad aluminum alloy binder flux 10 for brazing according to the present invention has much higher tensile strength It was found that it could withstand pressure.

Next, a method for manufacturing an aluminum header pipe using a non-clad aluminum alloy binder flux for brazing, which is another embodiment of the present invention, includes a header pipe forming step S100 for forming a header pipe 20, A head pipe forming step S200 for forming a communication hole 30 in the header pipe 20 and a header pipe processing step S300 for burning the header pipe 20, A header pipe brazing binder flux applying step (S400) of drying and drying a header pipe and applying a binder flux 10 for brazing of an aluminum material non-clad in the direction of the communication hole 30 of the header pipe 20 Step S500.

The header pipe forming step S100 is a step of forming a cylindrical header pipe 20 through a drawing process.

The header pipe 20 is formed of a pure aluminum bare material and has various shapes such as a triangle, a square, and a polygonal as well as a circular shape in cross section. The length and the thickness of the header pipe 20 It depends on the place and purpose.

The header pipe communication hole forming step S200 is a step of pressing the press on one side of the header pipe 20 formed through the header pipe forming step S100 to form the communication holes 30 at intervals in the longitudinal direction .

That is, a communication hole 30 is formed on one side of the header pipe 20 so that the connection part 60 of the coupling part 50 can be inserted and coupled.

Here, the communication hole 30 is formed along one side or both sides of the header pipe 20, and the shape of the communication hole 30 may be various shapes such as a rectangle, a circle, and a rectangle .

The header pipe processing step S300 is a step for further increasing the bonding property through the burning process of the header pipe 20 in which the communication hole 30 is formed through the header pipe communication hole forming step S200.

The header pipe washing and drying step S400 is a step of washing the header pipe 20 formed through the header pipe processing step S300 and then washing the washed header pipe 20 at a temperature of 90 ° C ~ And drying for 40 minutes.

It is noted that the washing liquid used to wash the header pipe 20 is water-soluble and the drying time of the header pipe 20 may vary depending on the size of the header pipe 20.

The header pipe brazing binder flux applying step S500 includes a binder flux for aluminum brazing that is non-clad in the direction of the communication hole 30 of the header pipe 20 formed through the header pipe washing and drying step S400 10).

Here, the method of applying the non-clad aluminum flux binder flux 10 to the header pipe 20 may be applied by using a known spray application method or a roller application method, and a detailed description thereof will be omitted.

That is, the non-clad aluminum binder binder flux 10 applied to the header pipe 20 is coated on the surface of the header pipe 20 by 20 to 30 탆 and then dried in a drying chamber at 120 to 200 캜 And then dried for 10 to 20 minutes to form a non-clad aluminum binder flux 10 for brazing on the surface of the header pipe 20.

At this time, the temperature in the drying chamber is limited to 120 ° C to 200 ° C because if the temperature of the drying chamber is less than 120 ° C, formation of the structure is difficult, and if the temperature of the drying chamber is 200 ° C or more, There is a problem.

The non-clad aluminum flux binder flux 10 applied to the header pipe 20 is formed by mixing any one selected from a silicon flux, a free flux and a zinc flux with a binder flux in a ratio of 4: 1 .

In this case, when the ratio of the silicon flux, the free flux and the zinc flux is mixed with the binder flux at a ratio of 4: 1, the formation of the structure is easy.

An embodiment of a method for manufacturing an aluminum header pipe using the non-clad aluminum flux binder flux for brazing as described above will be described below.

After forming the cylindrical header pipe 20 through the drawing process, the presser is pressed on one side of the header pipe 20 to form the communication holes 30 in the longitudinal direction at intervals, and then the header pipe 20) is burned.

After washing the header pipe 20, the washed header pipe 20 is dried in a drying chamber at a temperature of 90 ° C. to 110 ° C. for 20 to 40 minutes and then brazed in the direction of the communication hole 30 of the header pipe 20. Clad aluminum binder braze flux 10 composed of 45 to 60% by weight of powder, 15 to 25% by weight of non-coke flux and 20 to 30% by weight of binder solvent, When dried at 200 ° C for 10 to 20 minutes, the header pipe 20 is completed.

The manufacturing process of the aluminum header pipe manufacturing method using the non-clad aluminum alloy binder flux for brazing can be formed differently from the above.

An example of a header pipe used as a radiator of a vehicle in the above-described state will be described as follows.

First, after the two header pipes 20 are prepared, the connection portions 60 of the coupling part 50 are respectively fitted into the communication holes 30 of the header pipe 20 located at one side.

Another header pipe 20 is fitted and fixed to the opposite side of the header pipe 20 to which the coupling parts 50 are fitted.

Next, the assembled header pipe 20 and the coupling part 50 are seated in a drying chamber and then dried in a drying chamber at a temperature of 550 ° C. to 630 ° C. for 10 to 30 minutes to form an integral body. ) Is completed.

If the temperature of the drying chamber is maintained at 500 ° C. to 630 ° C., the brazing of the heat exchanger is not performed at a temperature of 500 ° C. or lower. If the temperature is higher than 630 ° C., the shape and properties of the component are changed and brazed.

While the present invention has been described with reference to specific shapes and orientations, it should be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as set forth in the appended claims. And variations and modifications may be made without departing from the scope of the present invention.

S100: header pipe forming step,
S200: header pipe communication hole forming step,
S300: header pipe machining step,
S400: header pipe washing and drying step,
S500: header pipe brazing binder flux application step.

Claims (8)

delete delete delete delete A header pipe forming step (S100) of forming a cylindrical header pipe (20) through drawing process,
A header pipe communication hole forming step (S200) of forming a communication hole (30) in a longitudinal direction by pressing a press on one surface of a header pipe (20) formed through the header pipe forming step (S100)
A header pipe processing step (S300) of performing a burning process on the header pipe (20) formed through the header pipe communication hole forming step (S200)
A header pipe washing and drying step of washing the header pipe 20 formed through the header pipe processing step S300 and drying the header pipe 20 washed in a drying chamber at a temperature of 90 ° C to 110 ° C for 20 to 40 minutes S400)
A binder flux 10 for brazing of aluminum brazing non-clad with brazing powder and non-coke flux and a binder solvent is introduced into the header pipe 20 through the header pipe washing and drying step (S400) Clad aluminum alloy binder flux 10 in the drying chamber after the application of the non-clad binder flux 10 in the non-clad (30) direction and drying the non-clad aluminum binder flux 10 in the drying chamber A method of manufacturing an aluminum header pipe using a binder flux for an aluminum brazing material.
The method of claim 5,
In the header pipe brazing binder flux application step (S500), the non-clad aluminum binder binder flux 10 for brazing is applied to the surface of the header pipe 20 by 20 to 30 占 퐉 and then dried at 120 to 200 占 폚 And then dried for 10 to 20 minutes. The method for producing an aluminum header pipe using the binder flux for non-clad aluminum brazing according to claim 1,
The method of claim 6,
The fixing of the coupling part 50 to the header pipe 20 is performed by fitting the coupling part 60 of the coupling part 50 into the communication hole 30 of the header pipe 20 and then inserting the header pipe 20 ) And the coupling part (50) are placed in a drying chamber and then brazed in a heat exchanger at a temperature of 550 ° C. to 630 ° C. for 20 to 30 minutes to form a binder flux for brazing for aluminum braiding Method of manufacturing aluminum header pipe used. The method according to any one of claims 5 to 7,
The non-clad aluminum binder binder flux 10 in the header pipe brazing binder flux application step S500 includes 45 to 60 wt% of a brazing powder, 15 to 25 wt% of a nocorro flux, and 20 to 30 wt% of a binder solvent % By weight of the binder flux for brazing. The method of manufacturing an aluminum header pipe using the binder flux for brazing of non-clad aluminum material.

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