FIELD: petroleum and chemical industries.
SUBSTANCE: the invention is dealt with molding of pipes, in which at molding a pipe compensation of shrinkage of plastics materials takes place. The device has a molding tunnel, which includes an upper molding block and at least one lower molding block located along its way. Each molding block consists of sections, which in production process are joining for a pipe molding and parting to release the pipe. The molding blocks are jointly moving to the lower end of the tunnel of the pipe molding device, and the pipe moving through the molding tunnel is chilled and shrinks in its diameter and length. After the pipe release the molding blocks are moving back separately in direction to the upper end along the tunnel of the device. Each molding block has a hollow zone used for molding a pipe. For compensation of shrinkage of a pipe the indicated zone of the lower block is made smaller in diameter and length along its sway of motion as compared with the zone of motion of the upper block. The invention ensures compensation of shrinkage in diameter and length of the produced pipes.
EFFECT: the invention ensures compensation of shrinkage in diameter and length of the produced pipes.
4 cl, 8 dwg
