JPH06234080A - Production of copper parts with cooling hole - Google Patents

Abstract

PURPOSE:To easily and stably produce the copper parts with three-dimensional cooling holes by disposing steel tubular members into copper plates formed with three-dimensional grooves, combining these members with plural pieces of copper plates and diffusion joining these members and plates, then removing the tubular members in the sulfuric acid soln. CONSTITUTION:The three-dimensional grooves (a), (b), (c), (e) or holes (f), (g) are formed in at least one piece among plural pieces of the copper plates 1, 2, 3 and steel pipes 6 or the steel tubular members 4, 5 consisting of plural pieces of divided members 7 and having a hollow shape in section when these members are combined are disposed. All these copper plates are combined and are diffusion joined by a hot isotropic pressurization treatment method. Only the pipes 6 or the tubular members 4, 5 are removed in the 10% sulfuric acid soln. of 70 deg.C liquid temp., by which the cooling holes are formed. As a result, the copper parts with the cooling holes having the three-dimensional shapes are obtd. The cooling holes with which the joining of the copper plates to each other is sufficient and which have the sure airtightness and watertightness are obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a copper part having a cooling hole used as a cooling plate, an electrode and a crucible, the cooling hole having an arbitrary shape and easily manufactured.

[0002]

2. Description of the Related Art As a conventional method for manufacturing a copper part with cooling holes of this kind, as shown in FIG. 9, a copper plate b having a groove a to be a cooling hole and a copper plate c are joined to each other. It was carried out by applying a brazing material to and brazing.

[0003]

In the above-mentioned conventional method, only two-dimensional grooves can be formed, and since the obtained product is brazed, sufficient bonding can be performed over the entire bonding surface. Therefore, it is difficult to stably obtain sufficient airtightness and watertightness. For this reason, it is difficult to obtain economically stable quality with certainty, and there are problems in terms of cost and yield.

An object of the present invention is to solve the above problems and to provide a manufacturing method capable of easily and stably manufacturing a copper component having a three-dimensionally shaped cooling hole.

[0005]

In order to achieve the above object, the present invention employs the following means. That is, at least one copper plate among a plurality of copper plates is provided with a steel pipe in a three-dimensional groove or hole, and then a plurality of copper plates are combined to diffuse by a hot isostatic pressing method. After joining and unifying, the steel pipe is removed in a sulfuric acid solution.

Further, in the method of the present invention, at least a part of the steel pipe is made up of a plurality of divided members as shown in FIGS. 4 to 8, and the steel tubular member has a hollow section when combined with each other. The method of substituting for may be adopted.

In the method of the present invention, the pipe or tubular member is arranged in the groove or hole for the following reasons. That is, when all copper plates are diffusion-bonded by the hot isostatic pressing method, in order to ensure sufficient bonding strength and ensure airtightness and watertightness, hot isostatic pressing is applied. It is preferable to increase the temperature and pressure of the pressure treatment. However, when these conditions are raised, if there is nothing in the groove or hole, the groove or hole to be the cooling hole is deformed and disappears during the processing. This is because all the copper plates are canned and the inside of the grooves or holes is evacuated during the hot isostatic pressing. Therefore, in order to prevent such deformation and disappearance, a steel pipe or tubular member having strength at a temperature higher than that of the copper plate is provided for supporting the groove or hole.

Further, the members arranged in the grooves or holes are made hollow either as a pipe or a tubular member, because when they are removed by sulfuric acid, they are made into solid materials such as square or round shapes. However, if it is made hollow, it will be dissolved from the entire inner surface of the member, and the meat of the member will be removed. This is because the removal is performed in the direction in which the thickness becomes thinner, and the removal can be performed in a short time.

Sulfuric acid was used to remove the pipe or tubular member made of steel, because other solutions such as hydrochloric acid and nitric acid dissolve the copper plate together with the pipe or tubular member, whereas sulfuric acid is used. This is because the result was that only the pipe or the tubular member was melted, and the copper plate was not melted. The pipe or tubular member is removed in order to increase the cooling efficiency of the obtained product. That is, if the steel member remains, a layer having poor thermal conductivity will exist between the copper component and the cooling medium, and the cooling efficiency will decrease.

[0010]

EXAMPLES Examples of the present invention will be described below. Figure 1
As shown in FIG. 2, 250 mmφ × 35 mmt copper plate 1,
Form circular grooves a, a, u, and d in 2 and 3, respectively,
In addition, holes O and lateral grooves were formed so that grooves A and C would be connected. The steel tubular member 4 is provided in the grooves a and a, and the steel tubular member 5 is provided in the grooves c and d, and the steel pipe 6 and the steel as shown in FIG. Tubular member 7
Was arranged. Then, the copper plates 1, 2 and 3 were superposed on each other, and the joint surface was seal-welded from the outer peripheral portion by electron beam welding, and then diffusion-bonded by a hot isostatic pressing device.
At this time, the hot isostatic pressing condition is that the temperature is 700 ° C.,
The pressure is 300 kgf / cm ² , and the time is 2 hours.

After that, holes and holes were provided so that the sulfuric acid solution could penetrate into the groove, and the steel tube member and the steel pipe were removed by immersing in a 10% sulfuric acid solution having a liquid temperature of 70 ° C. At this time, in order to accelerate the dissolution rate of the member pipe, a sulfuric acid solution was supplied into the member and the pipe using a metering pump. As a result, the member and the pipe could be removed in about 48 hours. As a result of observing the cross section after removing the member and the pipe, it was confirmed that only the member and the pipe were completely removed and the copper plate was not melted. In addition, it was confirmed that sufficient airtightness and watertightness were obtained in joining the copper plates.

[0012]

As described above, according to the method of the present invention, the hollow portion to be the cooling hole is formed by the shape of the three-dimensional steel pipe or the steel tubular member composed of a plurality of divided members. Since the shape and size can be freely selected, a pipe or tubular member is arranged in this hollow portion and diffusion bonding is performed by hot isostatic pressing, so that the groove or hole is deformed. Without removing or disappearing, only the steel pipe or tubular member is then dissolved and removed with sulfuric acid to obtain a copper component having a complete three-dimensional cooling hole. Further, the copper plates can be joined to each other sufficiently, and a cooling hole having airtightness and watertightness can be reliably obtained.

The method of the present invention employs a method of diffusion bonding by hot isostatic pressing. Since the pressure is applied from all directions during processing, even a complex shape is deformed. Therefore, there is an advantage in that it is possible to join without being complicated, and therefore, not only a flat copper component but also a curved copper component having a complicated shape can be manufactured.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is an exploded view showing an embodiment of the present invention.

FIG. 3 is a front view of a steel pipe and a steel tubular member used in an embodiment of the present invention.

FIG. 4 is an explanatory view showing an example of a cross section of a steel tubular member used in the present invention.

FIG. 5 is an explanatory diagram showing an example of a cross section of a steel tubular member used in the present invention.

FIG. 6 is an explanatory view showing an example of a cross section of a steel tubular member used in the present invention.

FIG. 7 is an explanatory view showing an example of a cross section of a steel tubular member used in the present invention.

FIG. 8 is an explanatory view showing an example of a cross section of a steel tubular member used in the present invention.

FIG. 9 is an explanatory diagram showing an outline of a conventional method.

[Explanation of symbols]

 1 Copper Plate 2 Copper Plate 3 Copper Plate 4 Steel Tubular Member 5 Steel Tubular Member 6 Steel Pipe 7 Steel Tubular Member

Claims (2)

[Claims] 1. A three-dimensional groove or hole is provided in at least one copper plate among a plurality of copper plates, a steel pipe is arranged in the groove or hole, and then a plurality of copper plates are combined and heat is applied. A method for manufacturing a copper component with cooling holes, characterized by forming cooling holes by removing the steel pipe in a sulfuric acid solution after diffusion bonding and integration by means of an isotropic pressure application method. . 2. A steel tubular member, at least a part of which is made up of a plurality of split members and which has a hollow cross section when combined together, instead of said steel pipe. 1. A method for manufacturing a copper component with cooling holes according to 1.