DEVICE FOR MOLDING OF PRODUCTS OF THERMOPLASTIC MATERIALS Russian patent published in 2002 - IPC

FIELD: plastic metal working. SUBSTANCE: the device has a die with a cavity and a pipe connection for air discharge, chamber with a movable punch installed above it and a pipe connection for air supply, air pressure control unit. The latter has the first air distributor, whose inlet is designed for connection to a compressed air source, and the outlet is connected to the pipe connection for air supply. The punch drive is made in the form of an air cylinder with above-piston and sub-piston cavities. The air pressure control unit comprises a control air-flow restrictor and the second air distributor, whose inlet is designed for connection to the compressed air source, and the first outlet is connected to the above-piston cavity of the air cylinder, pipe connection for air supply and the outlet of the first air distributor. The exhaust port of the latter is connected to the control air-flow restrictor, the second outlet of the second air distributor is connected to the sub-piston cavity of the air cylinder. EFFECT: provided pressure control both in the stage of molding and in the stage of drawing, and as a result, obtained preset profile of material distribution in the product walls and bottom with stable sections of the maximum tension. 3 cl, 1 dwg