Cold forming stamping

Conventional thermoforming of sheet and film is appHcable to the production of skylights, radomes, signs, curved wiadshields, prototype production of body parts for automobiles, skimohiles, boats, etc. Because BPA polycarbonate is malleable, it can be cold-formed like metal, and may be cold-roUed, stamped, or forged. 

Cold Forming Technology Stamping, Blanking, Coining, and Cold Forging.198... 

A press, a homemade toggle job, or a hot-stamping machine can be used to perform the cold working operation. When heat is required (usual requirement) the male forming die should be about 132 to 138°C (270 to 290°F). Pressure should be maintained for about 10 seconds. This time can be reduced if the product still retains residual molding heat or is preheated. The recommended preheating temperature is from 80 to 110 C (175 to 230°F). 

Fig. 10.25. Multilayer thin film capacitor structure printed in a single step on to a plastic substrate using the nanotransfer printing technique. A multilayer of Au/SiNx/Ti/ Au was first deposited on to a silicon stamp formed by photolithography and etching. Contacting this stamp to a substrate of Au/ PDMS/PET forms a cold weld that bonds the exposed Au on the stamp to the Au-coating on the substrate. Removing the stamp produces arrays of square (250 pm x 250 pm) metal/...

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