JPH04210406A - Hot isostatic press working method for cooling structure - Google Patents

Abstract

PURPOSE:To simply work a high strength cooling structure in low cost by setting a metallic tube filling water core and sealing both ends into a capsule, packing metal powder in the capsule and executing hot isostatic pressing treatment. CONSTITUTION:The water core 1 is filled into the copper tube 2 for forming coolant flow passage and both ends of the tube is sealed with welding. This copper tube 2 is set into a panel-shaped stainless steel-made capsule 4 and further, the copper powder 3 is packed so as not to remain any gap. Successively, after degassing inner part of the capsule 4 at high temp., the hot isostatic pressing treatment is executed to execute sintering of the copper powder 3. After that, the capsule 4 is removed and the water core 1 is removed by draining water. By this method, the optional shaped copper-made cooling panel 5 having coolant flow passage, is obtd.

Description

[Detailed description of the invention]

[00011

[Industrial Application Field] The present invention is directed to hot isostatic pressure (hereinafter referred to as HIP) for cooling structures that will be applied to future aerospace engines and leading edges of airframes.
5ostatie pressing) processing method. [0002] [0002] In a component having a conventional cooling structure,
Electroforming (electroplating) was used to process the cooling structure. . [0003] The electroforming process described above is as shown in FIG. 6 and will be explained below. First, in step 1, block material 01
, a groove is dug by machining, and this is used as the cooling groove 02. In step 2, the cooling grooves 02 are filled with wax 03. In step 3, a conductive coating 04 is applied to the surface of the wax 03 using silver powder or the like so that electroplating (electroforming) can be performed. In step 4, electroformed layer 05 is formed by electroplating (electroforming).
form. In step 5, the wax 03 was removed using hot water or the like to obtain the cooling structure holes 06, and finally the surface of the electroformed layer 05 was mechanically finished so as to have no unevenness. [00041

[Problems to be solved by the investigation] The conventional methods had the following problems. [0005] (1) The process is complicated and the cost is high. As shown in FIG. 6, the conventional process requires many steps such as groove machining, wax embedding, conductive coating, electroforming, and surface finishing. Additionally, special precision processing machines are required for groove machining, and electroforming requires long processing times. This results in high costs. [0006] (2) Control of electroforming is difficult. In order to obtain a high quality electroformed layer, it is necessary to strictly control the plating solution. [0007N (3) The strength of the electroformed layer is low. Because electroforming can basically only be done with pure metals, its strength is significantly lower than that of alloys. [0008] (4) The cooling structure hole cross section is limited to a rectangular shape, making it impossible to process a circular shape with the best thermal efficiency. [00091] An object of the present invention is to provide a processing method that solves the above-mentioned problems of conventional methods and enables integral molding of a cooling structure. [00101] [Means for Solving the Problems] In the hot isostatic processing method for a cooling structure of the present invention, a metal tube is filled with water molecules and both ends are sealed, and the metal tube is placed in a capsule with a cellar 1.
After filling with metal powder and performing hot isostatic pressure treatment,
It is characterized by removing underwater spores. [0011] [Operation] In the above, the coolant passage of the cooling structure is formed by a metal tube, and the metal tube is set in a capsule and filled with metal powder to perform HIP processing. Because it is enclosed, HIP
Coolant passages will not be crushed due to treatment. [0012] Furthermore, since the method of the present invention is based on a powder metallurgy method, complex shapes can be formed by devising the capsule shape, and a net shape is also possible, and when strength is required, metal powder can be used. It is also possible to create a high-strength structure by selecting the type of structure. Furthermore, since HIP processing is used, control is easy, and since a large number of products can be processed at once, mass production becomes easy and the process becomes simple. [001,3] As described above, the coolant passage is secured,
A processing method that can be molded into complex shapes, maintains high strength, and has a simple process that enables mass production. [0014)

[Embodiment] A first embodiment of the present invention will be explained with reference to FIG. The present embodiment shown in FIG. 1 is related to the production of the copper cooling panel shown in FIG. Temporarily assemble by side-by-side welding. In the next step 2, the temporarily assembled tube 2 is set in a panel-shaped stainless steel capsule 4, and the copper powder 3 is further filled so that there is no gap. In step 3, the inside of the capsule 4 is degassed at high temperature and then vacuum sealed, and the powder is sintered by HIP processing. In the final step 4, the specimen 5 is taken out from inside the capsule 4, and the underwater child 1 is removed using water. [0015] In the above, the coolant passage of the cooling panel is formed by the copper tube 2, the steel tube 2 is set in the capsule, and the copper powder 3 is filled to perform the HIP treatment. Because it includes
It is possible to prevent the coolant passage from collapsing due to HIP treatment, and the tube shape is maintained. [0016] Furthermore, since the method of this example uses a powder metallurgy method, complex shapes can be formed by devising the capsule shape, and net shaping is also possible. A high-strength structure can also be obtained by using a strength alloy powder. The above powder can be made into an alloy with even higher strength by using a mechanical alloy, and particle or whisker dispersed metals can also be applied. [001,7] Furthermore, since the method of this embodiment uses HIP processing, it is easy to control, and since a large number of products can be processed at once, mass production becomes easy and the process becomes simple. [0018] As described above, since the coolant passage is formed using a metal tube and the HIP treatment is performed using the powder metallurgy method, the coolant passage can be secured, the coolant passage can be formed into a complicated shape, and high strength can be maintained. , to realize a processing method that has a simple process and can be mass-produced. [0019] A second embodiment of the present invention will be described with reference to FIG. The present embodiment shown in FIG. 3 is an example of application to a liquid rocket engine combustion chamber, and the processing process is the same as the first embodiment described above. Step 1 is to process a copper tube to match the shape of the combustion chamber. They are arranged to match the shape of the combustion chamber, temporarily assembled by welding, and a water child is stuffed into the tube offshore to seal both ends. In step 2, the temporarily assembled tube is set in a stainless steel capsule in the shape of a combustion chamber, and copper powder is then filled so that there are no gaps. In step 3, the inside of the capsule is degassed at high temperature, then vacuum sealed and HIP
The treatment causes the powder to sinter. In the final step 4, the specimen is taken out from the capsule and the water particles are removed. [o o 201 This embodiment is a case where the coolant passage has a complicated shape, but the same operation and effect as in the first embodiment can be obtained in this case as well. [00211 A third embodiment of the present invention will be described with reference to FIGS. 4 and 5. The present embodiment shown in FIGS. 4 and 5 is an example of application to an active cooling structure for a space plane. [0022] Since this structure requires particularly high thermal conductivity and strength, it will be manufactured from carbon fiber reinforced steel alloy composite material, but the processing process will be the same as the above-mentioned No. 1.
This is the same as in the example, and in step 1, the three-pronged steel tube 6 is processed to match the shape of the leading etched part, arranged to match the shape of the etched part, and temporarily assembled by welding.
Fill the tube with water molecules and seal the end. In step 2, the temporarily assembled tube and carbon fiber-reinforced steel alloy composite panel 7 are set in a leading etch-shaped stainless steel capsule, and then a ball-milled mixture of carbon whiskers and copper powder is filled without any gaps. In step 3, the inside of the capsule is degassed at high temperature and then vacuum sealed, and the powder is sintered by HIP processing. In the final step 4, the specimen is taken out from the capsule and the water particles are removed. [0023] This embodiment also has the same functions and effects as the first embodiment, and a high-strength structure is realized. [0024]

Effects of the Invention In the hot isostatic processing method of a cooling structure of the present invention, a metal tube filled with water molecules and forming a coolant passage is set in a capsule, and metal powder is filled in the capsule and HIP is performed. By performing this treatment, we have realized a processing method that secures coolant passages, allows molding into complex shapes, maintains high strength, and allows for simple processes and mass production.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a processing process according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of the cooling panel according to the first embodiment.

FIG. 3 is an explanatory diagram of a liquid rocket engine combustion chamber according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of an active reading structure according to a third embodiment of the present invention.

FIG. 5 is an explanatory diagram of a processing method according to the third embodiment.

FIG. 6 is an explanatory diagram of a conventional method.

[Explanation of symbols]

1 Water child 2 Copper tube 3 Copper powder 4 Capsule 5 Specimen 6 Trifurcated steel pipe 7 Panel

[Figure 1]

Claims (1)

[Claims] Claim 1: Filling a metal tube with water molecules and sealing both ends, setting the metal tube in a capsule, filling it with metal powder, performing hot isostatic pressure treatment, and then removing the water molecules. A hot isostatic processing method for a cooling structure, characterized by: