Disclosed is a multi-layered composite panel. The multi-layered composite panel comprises at least two sheets of thin plates with continuous waveform patterns having the same pitch and different heights in one direction are overlapped. In the multi-layered composite panel, an adiabatic layer is form
Disclosed is a multi-layered composite panel. The multi-layered composite panel comprises at least two sheets of thin plates with continuous waveform patterns having the same pitch and different heights in one direction are overlapped. In the multi-layered composite panel, an adiabatic layer is formed between the overlapping thin plates, diagonal pressing portions, which divide the waveform patterns on the top and the bottom of the thin plates into the unit of triangle-patterned cell by being pressed diagonally to cross each other on the top and the bottom of the thin plates overlapping in the diagonal direction crossing the direction of the waveform patterns, are formed and an undercut portion is formed by pressing the centers of both sides connecting a groove and a ridge of each cell on the top and the bottom of the thin plates with opposite diagonal pressing portions.
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1. A multi-layered composite panel, comprising at least two sheets of thin plates, wherein the two sheet of thin plates include continuous waveform patterns having the same pitch and different heights in one direction and are overlapped, and an adiabatic layer is formed between the overlapping thin
1. A multi-layered composite panel, comprising at least two sheets of thin plates, wherein the two sheet of thin plates include continuous waveform patterns having the same pitch and different heights in one direction and are overlapped, and an adiabatic layer is formed between the overlapping thin plates;diagonal pressing portions, which divide the waveform patterns on the top and the bottom of the thin plates into the unit of triangle-patterned cell by being pressed diagonally to cross each other on the top and the bottom of the thin plates overlapping in the diagonal direction crossing the direction of the waveform patterns, are formed; andan undercut portion is formed by pressing the centers of both sides connecting a groove and a ridge of each cell on the top and the bottom of the thin plates with opposite diagonal pressing portions. 2. The multi-layered composite panel of claim 1, wherein the adiabatic layer is formed to be closed in the unit of triangle-patterned cell between the overlapping thin plates by the diagonal pressing portions between the ridge and the ridge and between the groove and the groove. 3. The multi-layered composite panel of claim 1, wherein the overlapping thin plates are a top plate and a bottom plate, which are made of aluminum. 4. The multi-layered composite panel of claim 1, wherein the overlapping thin plates are a top plate and a bottom plate which have about the same thickness. 5. The multi-layered composite panel of claim 1, wherein the overlapping thin plates are a top plate and a bottom plate which have different thicknesses. 6. The multi-layered composite panel of claim 1, wherein the waveform pattern is a sine waveform pattern continuous in one direction. 7. The multi-layered composite panel of claim 1, wherein the diagonal pressing portions are formed by pressing, in the zigzag shape on the top and the bottom of the overlapping thin plates. 8. The multi-layered composite panel of claim 1, wherein at the diagonal pressing portions, the thin plates are in contact with each other. 9. The multi-layered composite panel of a claim 1, wherein the cell unit includes a triangle-patterned closed air layer formed between the overlapping thin plates by the diagonal pressing portions between the ridge and the ridge and between the groove and the groove. 10. The multi-layered composite panel of claim 1, wherein the crossing diagonal directions have an acute angle and an obtuse angle with respect to the direction of the waveform patterns. 11. The multi-layered composite panel of claim 1, wherein the adiabatic layer is configured to be an air layer or filled with inorganic heat insulting material including at least one of silicon dioxide powder (SiO.sub.2 power), aluminum oxide power (Al.sub.2O.sub.3 power), vermiculite, silica, aerogel (SiO.sub.2), or fumed silica (SiO.sub.2). 12. A multi-layered composite panel, comprising: a uniform adiabatic layer formed between a top plate and a bottom plate, which are aluminum thin plates with continuous waveform patterns having the same pitch and different heights and overlap each other;diagonal pressing portions, which divide the waveform patterns on the top plate and the bottom plate into the unit of triangle-patterned cell by being pressed diagonally to cross each other on the top of the top plate and the bottom of the bottom plate overlapping in the diagonal direction crossing the direction of the waveform patterns, are formed; andan undercut portion is formed by pressing the centers of both sides connecting a groove and a ridge of each triangle-patterned cell on the overlapping top and bottom plates with opposite diagonal pressing portions. 13. The multi-layered composite panel of claim 12, wherein the adiabatic layer is formed to be closed in the unit of triangle-patterned cell between the ridges and between the grooves of the overlapping top and bottom plates by the diagonal pressing portions. 14. The multi-layered composite panel of claim 12, wherein the top plate and the bottom plate are about the same in thickness. 15. The multi-layered composite panel of claim 12, wherein the top plate and the bottom plate are different in thickness. 16. The multi-layered composite panel of claim 12, wherein the waveform pattern is a sine waveform pattern continuous in one direction. 17. The multi-layered composite panel of claim 12, wherein at the diagonal pressing portions, the top plate and the bottom plate are in contact with each other. 18. The multi-layered composite panel of claim 12, wherein the cell unit includes a triangle-patterned closed air layer formed between the ridges and between the grooves of the overlapping top and bottom plates, by the diagonal pressing portions. 19. A heat protector of a vehicle manufactured using the multi-layered composite panel of claim 1. 20. A method of manufacturing a heat protector of a vehicle, comprising: press-forming to an external shape of the heat protector in a pressing process using the multi-layered composite panel of claim 1.
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