A foam-filled hollow circular tube pyramid lattice sandwich panel and its preparation method
A foam filling and pyramid technology, applied in the aerospace field, can solve problems such as bearing capacity restriction, structural bearing capacity decline, uneven pore size, etc., to save manpower and time, improve bearing capacity, and simplify preparation steps.
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[0038] The invention discloses a method for preparing a foam-filled hollow circular tube pyramid lattice sandwich panel. First, the hollow inclined circular tube is inserted into the plate with inclined round holes in the upper panel and the lower panel, and vacuum brazing or laser welding is carried out; The inclined foam column is inserted into the hollow inclined circular tube, and the foam and the circular tube are connected by glue joint; finally, the solid plate is connected outside the upper and lower inclined circular hole plates by laser welding or gluing, and a foam-filled hollow circular tube pyramid is obtained. Dot matrix sandwich panel, the specific steps are as follows:
[0039] S1, cutting two metal plates and punching oblique round holes arranged periodically at the positions calculated in advance to prepare the inclined round hole plate 2 and the inclined round hole plate 3, cutting two pieces with the inclined round hole plate 2 and the band A solid plate 1 ...
Embodiment 1
[0047] (1) Cut four 2024-T3 aluminum alloy square plates with a thickness of 2 mm and a side length of 100 mm. Two of the square plates are the first solid plate 1 and the second solid plate 4; on the other two square plates, 45° inclined circular holes are cut according to the positions calculated in advance (each plate has 4 inclined circular holes), Obtain the first round hole plate 2 and the second round hole plate 3 with inclined holes;
[0048] (2) Obtain 2024-T3 aluminum alloy hollow inclined round pipe 5 by cutting with numerical control cutting machine, pipe diameter is 25mm, and nozzle inclination angle is 45 °, block PMI foam is cut into hollow circle with thermal resistance wire cutting technology Solid sloped foam column 6 with matching inner diameter of the tube;
[0049] (3) Insert the hollow inclined round tube 5 made of 2024-T3 aluminum alloy into the first round hole plate 2 and the second round hole plate 3 with inclined round holes, and perform laser weldi...
Embodiment 2
[0053] (1) Cut four 304 stainless steel square plates with a thickness of 2mm and a side length of 100mm. Two of the square plates are the first solid plate 1 and the second solid plate 4; on the other two square plates, 60° inclined round holes are cut according to the positions calculated in advance (each plate has 4 inclined round holes), Obtain the first round hole plate 2 and the second round hole plate 3 with inclined holes;
[0054] (2) Obtain 304 stainless steel hollow inclined circular tubes 5 by cutting with a numerical control cutting machine, the pipe diameter is 25mm, and the nozzle inclination angle is 60 °, and the block PMI foam is cut into the same size as the hollow circular tube internal diameter with the thermal resistance wire cutting technology Matching solid sloped foam column 6;
[0055] (3) 304 stainless steel hollow inclined round tubes 5 are inserted into the first round hole plate 2 and the second round hole plate 3 with inclined round holes, and l...
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