JP2580287B2 - How to make a metal San German panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to various types of insulation panels used for various spacecraft such as aircraft, rockets, space shuttles, and avionics panels used for artificial satellites. The present invention relates to a method for manufacturing a metal San German panel.

[Conventional technology]

2. Description of the Related Art Conventionally, the following method is generally known as a manufacturing technique of a metal San German panel used for aerospace equipment and the like.

(1) A method in which a core is formed into a predetermined shape and then a face sheet is joined to form a panel.

(2) A method in which three or more plates are selectively diffusion-bonded to predetermined positions of opposing plates, and then the plates are superplastically inflated into panels.

(3) A method in which two plates having predetermined positions selectively welded are superplastically inflated and diffusion-bonded to a plate disposed on the outer layer to form a panel.

[Problems to be solved by the invention]

By the way, each of the above-mentioned conventional methods of manufacturing a metal San Germanium panel has the following disadvantages.

(1) In the conventional method 1, since the core and the face sheet are separately molded, both the mold cost and the manufacturing cost are increased, and at the same time, there is a problem in the joint surface accuracy, and the complicated core shape and the curved panel are not used. Fabrication is very difficult.

(2) In the conventional method 2, there is a possibility that a joint failure may occur due to scattering of the joint-preventing muscat (mainly composed of ceramic fine particles) to the joint portion, or a portion other than the portion to be joined may be joined. At the same time, there is a problem in stability, and there is a problem in that the applied material is limited to the same type of material having diffusion bonding properties.

(3) In the conventional method 3, there is a possibility that the diffusion bonding failure between the core and the face sheet may occur due to contamination of the bonding surface during the superplastic forming. It is not possible to manufacture a multilayer panel having more than four layers, limited to the same kind of material.

An object of the present invention is to provide a new method for manufacturing a metal San Grenchi panel that has solved the above-mentioned disadvantages.

[Means for solving the problem]

For this reason, the method for manufacturing a metal sandwich panel of the present invention includes a member for forming a core sheet portion of the sandwich panel,
Two or more sets of thin sheets in which arbitrary positions of two or three thin sheets as face sheet constituent members are appropriately joined by welding means or the like are stacked so that two or more sets of core sheets overlap each other, and further, each set of these thin sheets is stacked. The core sheet constituting member which is the outermost layer of each pair is made of a material having superplastic properties, and the plates are joined at the outer ends of the thin plates or mechanically clamped or vacuumed between the plates to hold them tightly. The workpiece is integrally formed, the workpiece is positioned between the upper and lower molds, clamped by the molds, and then heated to a superplastic forming temperature to expand each of the thin sheets, and It is characterized in that superplastic forming is performed by bringing the mold into close contact with the mold having the following shape.

[Action]

According to the above-described method of manufacturing a metal San Germanium panel of the present invention, two or three sheets are joined at predetermined (arbitrary) positions, and a set of thin plates is laminated and heated to a superplastic forming temperature in a mold. By applying a fluid pressure inside the gap between the plates of each set of thin plates and performing superplastic forming, the outermost plates of each of the opposed sets of thin plates are formed into the same shape while being in close contact with each other, as if one sheet It can be handled like a board. This stabilizes the bonding quality between the core and the face sheet, and at the same time, is applicable to materials that do not have diffusion bonding properties or a combination of different materials, and can also produce curved panels and multilayer panels. doing.

〔Example〕

The method of one embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an operation explanatory view showing a first embodiment of the present invention, and FIG. 2 is an operation explanatory view showing a second embodiment.

First, in FIG. 1, two thin plates 2 and 3 serving as core sheet constituent members of a sandwich panel are joined at a predetermined joining position 1.
In the above, two sets of thin plates joined to the face sheet constituting member of the sandwich panel by welding means are overlapped with two sets of thin plates 2 and 3 constituting the core sheet portion so as to overlap each other, and the outermost layer of each of the opposing sets is overlapped. The workpieces 6 are formed by welding or mechanically clamping the plates, that is, the core sheet components, at the outer ends 5 of the plates.
The joining of the outermost layer portion of the thin plate at the opposing outer end portions 5 of each pair is for evacuating the two plates (2, 3) to keep the two plates in close contact during superplastic forming. Yes, it is not particularly necessary if the adhesion and airtightness can be maintained. Next, the workpiece 6 is positioned between the upper mold 7 and the lower mold 8 and the periphery thereof is clamped.
By heating to the superplastic forming temperature and applying fluid pressure to the inside of the gap between each of the sets of thin plates 2 and 3 to inflate them, and bringing them into close contact with the mold, the metal sanctuary panel 9 is manufactured. At this time, the opposing outermost plates (2, 3) of each set are formed into the same shape while being in close contact with each other, and if a material having diffusion bonding property at the forming temperature is bonded during the forming, an integrated plate is formed. Ten
Becomes In the case of a material having no diffusion bonding property, a filler metal may be inserted between the outermost layer plates and brazed during or before and after molding. The embodiment of FIG. 2 shows a case where three thin plate sets including four thin plates 2, 3, and 4 are joined and laminated in the same manner as in the case of FIG. Other manufacturing steps are the same as those in FIG.

Various joining methods such as spot welding and seam welding can be applied as the joining method of each thin plate set.

〔The invention's effect〕

As described above, the effects of the present invention are described below in comparison with the above-described conventional method.

(1) Compared to the conventional method 1, there are effects such as a significant improvement in the degree of freedom of the core shape and the panel curvature, a significant reduction in cost, and the like.

(2) Compared to the conventional methods 2 and 3, it has the effects of improving the joining quality, expanding the applicable materials, and increasing the degree of freedom for multi-layer panels.

(3) The core sheet and the core sheet are formed by laminating a set of the face sheet and the core sheet so that the core sheets overlap each other, and forming the overlapping core sheet and the core sheet into the same shape while keeping the core sheet and the core sheet in close contact with each other before superplastic forming. This has the effect that the bonding quality of the core sheet can be ensured and the thickness distribution of the core sheet can be made uniform.

[Brief description of the drawings]

FIG. 1 is an operation explanatory view showing a first embodiment of the present invention, and FIG.
The figure is a diagram for explaining the operation of the second embodiment. 1 ... joint, 2, 3, 4 ... thin plate, 5 ... joint, 6 ...
Workpiece, 7: Upper die, 8: Lower die, 9: Metallic San German panel, 10: Integrated plate

Claims (1)

(57) [Claims] 1. A member for constituting a core sheet portion of a sandwich panel, and two or three members constituting a face sheet.
At least two sets of thin sheets in which arbitrary positions of the thin sheets are appropriately joined by welding means or the like are laminated so that the core sheets overlap each other, and furthermore, the core which becomes the outermost layer of each set facing each other when the respective sets of these thin sheets are laminated. The sheet members are made of a material having superplastic properties, and the sheets are joined together at the outer end of the thin sheet or mechanically clamped or vacuum-formed between the sheets so that the sheets are held in close contact with each other to integrally form the workpiece. The workpiece is positioned between the upper and lower dies, clamped by the dies, and then heated to a superplastic forming temperature to expand each of the thin plates and adhere to the dies having a predetermined shape. A method for manufacturing a metal sandwich panel, comprising: