JPS61123459A - Insert-casting method of copper or copper alloy pipe to aluminum alloy casting - Google Patents

Abstract

PURPOSE:To improve the heat transmission characteristic of an Al alloy casting by forming preliminarily a coating layer which has the m.p. higher than the m.p. of an Al alloy and is hardly diffusible into the melt of the Al alloy on the outside surface of a copper or copper alloy pipe. CONSTITUTION:An Al wire or the like having the m.p. higher than the m.p. of the Al alloy is heated and melted and is thermally sprayed by a thermal spraying gun to the outside surface of the copper or copper alloy pipe 2. The coating layer 3 which is hardly diffusible into the melt of the Al alloy is formed on the outside surface of the pipe 2. The thickness of the layer 3 is made at least >=250mum and to the extent at which the penetration to the inside of the molten Al alloy is prevented. The copper or copper alloy pipe 2 formed with the layer 3 is insert-cast into a cooling plate 1 made of the Al alloy. Since the pipe 2 having the good heat transmission characteristic can be insert-cast to the Al alloy casting by the above-mentioned method, the heat transmission characteristic of the casting is improved.

Description

Detailed Description of the Invention [Industrial Application Field 1] The present invention relates to aluminum alloy castings in which cooling or heating pipes are cast, for example, aluminum alloy castings in which cooling pipes are cast. The present invention relates to resin molding molds, large marine pistons, various cooling plates, and various heating plates made of aluminum alloy in which heating pipes are cast.

[Prior Art 1] Conventionally, this type of aluminum alloy product has been supplied with a refrigerant or a heat medium through iron pipes wrapped around it or holes formed by machining. However, iron pipes have low thermal conductivity, so sufficient cooling or heating performance cannot be obtained.On the other hand, when holes are provided for heating or cooling, the holes cannot be curved, so the holes cannot be used for cooking pots. There was a problem in that it was difficult to conform to the shape of snow, and it was difficult to obtain sufficient cooling or heating performance.

As a countermeasure, it is possible to cast aluminum alloy castings with copper pipes or copper alloy pipes with high thermal conductivity. However, the melting point of copper or copper alloy (approximately 1000℃
) is higher than the melting point of aluminum alloy (approximately 650°C), copper or copper alloy easily diffuses into the molten aluminum alloy, so copper or copper alloy pipe (hereinafter simply referred to as copper pipe) is 'g in the molten aluminum alloy
:i? There is a problem in that the copper pipe melts into the molten metal when it is cast, so the casting of copper pipes into aluminum alloy castings is not done properly.

Therefore, in the resin molding mold, a copper pipe is attached to the back of the mold, and this copper vibe is cut into aluminum.
A cooling structure is known in which a vLN is used as a cover material made of a resin containing powder or the like. However, even in this case, since the body pipe is provided outside the mold, a sufficient cooling effect cannot be obtained.

[Object of the Invention 1 The present invention has been made in view of the above problems, and an object of the present invention is to enable casting of a copper pipe into an aluminum alloy casting.

1 Configuration 1 of the Invention For this reason, the present invention provides a method in which the outer surface of a copper pipe is coated with a material having a melting point higher than that of an aluminum alloy, and which has a higher melting point than an aluminum alloy. 8
After forming a coating layer made of a material that is difficult to diffuse into the bath,
The present invention provides a method for fitting a copper pipe into an aluminum alloy casting, characterized in that the above-mentioned copper pipe is cast into an aluminum alloy casting.

Effect of the invention 1 According to the present invention, the outer surface of the copper pipe is protected by a coating layer that is difficult to diffuse into the molten aluminum alloy, so that when the copper pipe is immersed in the molten metal, This makes it possible to cast copper pipes with high thermal conductivity into aluminum alloy castings.This greatly improves the cooling or heating performance of second-class aluminum alloy castings. can be done.

[Example 1] When a steel pipe 2 for supplying refrigerant is cast into a partially open ring-shaped aluminum alloy cooling plate 1 as shown in FIG. A wLII layer 3 made of aluminum, which has a higher melting point than the aluminum alloy and is difficult to diffuse into the molten aluminum alloy, is preliminarily applied to the outer surface of the aluminum alloy.
By forming this, it was possible to successfully insert the copper pipe 2 into the cooling plate 1 without melting the copper pipe 2 into the cooling plate 1.

4 is a refrigerant supply row 5 is a refrigerant discharge port.

The above-mentioned coating layer 3 was formed by heating and melting an aluminum wire rod of 3.2Iφ and spraying it on the outside of the copper vibe 2 (III) using a thermal spray gun.The thickness of the coating layer 3 was 300 to 500μ.
Met. In addition, if the covering layer 3 is too thin, after the covering layer 3 is melted into the molten aluminum alloy, the copper vibe 2
Since there is a risk that the aluminum alloy may melt into the molten aluminum alloy, the thickness of the coatings 1 and 3 is preferably at least 250 μm in the case of aluminum, for example. In addition to aluminum, as the material for the Wt waste 3, any material can be used as long as it has a higher melting point than the aluminum alloy and is difficult to diffuse into the molten aluminum alloy, such as iron, stainless steel, ceramics, and alumina. However, aluminum is the most effective because of its high thermal conductivity.

In addition, as a method for forming the coating layer 3, other than thermal spraying, the following various methods can be employed.

(■) A cladding tube made of aluminum or the like is fitted over the copper vibe 2 to form a double tube structure.

(ii>gi4 Wrap aluminum foil or wire around the outer surface of the pipe 2.

(iii) Powder of aluminum or the like is applied to the outer surface of the copper vibrator 2 using a caking agent.

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view of a cooling plate manufactured by the method of the present invention along line A-A in Fig. 2, and Fig. 2 is a perspective view of the cooling plate.6 2...Copper pipe, 3...・Covered layer m.

Claims (1)

[Claims] (1) After forming a coating layer made of a material that has a higher melting point than aluminum alloy and is difficult to diffuse into the molten aluminum alloy on the outer surface of the copper or copper alloy pipe, the copper or copper alloy pipe is coated on the aluminum alloy casting. A method for casting copper or copper alloy pipe into an aluminum alloy casting, characterized by casting a copper or copper alloy pipe into an aluminum alloy casting.