JPS603960A - Production of castings incorporating cooling water passage - Google Patents

Abstract

PURPOSE:To produce a casting incorporating an intricately curved water passage without using a chaplet by using a core which is formed by packing molding sand in a metallic pipe and curing the same and melting the surface of the metallic pipe by the heat of the molten metal. CONSTITUTION:A core is formd by using a pure copper pipe for forming a corrugated spiral pipe which is preliminarily corrugated to a spiral shape and bending the same to a determined design. A sand material to be used for a shell mold, etc. is packed therein and is cured. The core is then set in a casting mold 1 and a molten metal is poured into the mold 1. The core is embedded by molten metal poured into the mold but the pipe is so formed as to melt, the casting in which the pipe and the molten metal are bound to one body is obtd. The inside wall of the cooling passage transferred faithfully with the inside surface pattern of the corrugated spiral pipe is thus formed. When the casing is taken out of the mold and the sand in the pipe is removed, the casting incorporating the cooling passage of the corrugated spiral mold is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a casting having built-in cooling channels.

Cooling channels built into castings are usually manufactured using cores. However, in the case of complicatedly curved waterways,
Problems arise with the strength of the core used. In such cases, there may be problems with supporting the core, and a method such as sikelen may be used. The use of V/ is likely to cause water leakage accidents.The present invention was made in view of the above circumstances, and is a novel casting method that can form a complexly curved waterway without using aluminum or keren. The aim is to provide a manufacturing method that is suitable for manufacturing.

The gist of the present invention is that when forming a cooling channel in a casting using a core, a metal pipe with good thermal conductivity is filled with foundry sand and hardened. When bathing,
This method of manufacturing a casting with a built-in cooling channel is characterized in that the heat of the molten metal melts at least the surface of the maple pipe to integrate the molten metal and the pipe.

Next, one embodiment of the present invention will be described with reference to the drawings.

Figure 1 shows what happens when water droplets are applied when making a casting with a built-in cooling path, such as an air blower.

The cross-section of the inner wall of the cooling channel in this example has a corrugated helical structure with concavities and convexities in a spiral shape as shown in Figure 2, and it is originally very difficult to make a core with this shape. be. It is difficult to make sand cores using molds.

The method of the present invention is most effective when applied to such things.

First, the core is made of corrugated waves 211 that have been made into a spiral shape in advance.
Make a 1I spiral vibe using pure copper pipe.

Next, this corrugated helical pipe is bent into a predetermined design, and then a sand material used for a shell mold or self-hardening mold is filled into the pipe and hardened.

Through the above steps, a core with a composite structure consisting of an elongated tube on the surface and sand on the inside is completed.

Next, this is set in a mold (1) as shown in the figure.

(2) is a joining core.

The outer layer of the core (2) is made of a copper pipe with a perforated surface, so it bends in a complicated manner, and can adapt to the bending even when it is under its own weight. It can be identified by hanging it from above without supporting it.

Next, molten metal is poured into the mold (1). The core is encapsulated by the injected molten metal, but this molten metal and 'il:J
If you make it so that a part of the pipe surface or the entire pipe melts when the pipe surface contacts, the pipe and molten metal will become integrally bonded, and the inner surface pattern of the corrugated helical pipe will be faithfully transferred. A cooling passage inner wall is formed.

When the casting is removed from the mold and the sand inside the pipe is removed,
A casting with a built-in corrugated helical cooling path is completed. Although it is a redundancy, such a corrugated helical cooling path has a cooling capacity of about 1.5 to 2 times that of a normal one. This is because the water flowing through this pipe flows along the uneven helical grooves, so spin is given to the water flow along the grooves, and the water flows while rotating in a helical manner while acting on a centrifugal force.

In the present invention, since it is necessary that at least the surface of the pipe be melted by the molten metal, it is necessary to determine the wall thickness of the pipe by fully taking into account the heat capacity of the molten metal. If there is an excess or deficiency in heat capacity, it will be necessary to preheat the pipes.

The present invention provides for a waterway that is roughly curved as described in detail above.
This method allows the core to be suspended from above and formed inside the cast product without using a keren, and is very effective for products that circulate high-pressure water.

[Brief explanation of the drawing]

Fig. 1 shows an example of applying the method of the present invention to a casting such as a blowing tuyere, and Fig. 2 shows an example of the inner wall structure of a water channel in particular in the case of Fig. 1. be. [

Claims (1)

[Claims] When using a core to form a cooling channel in a casting, the core is a metal pipe with good thermal conductivity filled with foundry sand and hardened. A method for manufacturing a casting with a built-in cooling channel, characterized by melting and cutting at least the surface of the metal pipe to integrate the common water and the pipe.