Tube-shaped shell wall manufacturing method for elastomer stator of eccentric screw pump that is utilized for conveying plaster, involves deforming non-pre-formed semi-finished product corresponding to negative mold

摘要

The method involves arranging a hollow, non-pre-formed semi-finished product e.g. cylindrical pipe section, in a negative mold for forming a shell wall (5). Liquid is introduced in to interior of the product. The liquid is subjected with high pressure such that material of the pipe section flows in to the mold and the product is deformed corresponding to negative mold. Outer winding (11) and an inner winding (13) of the shell is measured such that the wall comprises a uniform thickness. The shell wall is made of metal and manufactured by internal high-pressure expansion. Independent claims are also included for the following: (1) a method for manufacturing a stator (2) eccentric screw pump for conveying goods.