METHOD OF PRODUCING PISTONS FOR MUD PUMPS Russian patent published in 2010 - IPC B29D99/00 B29C41/20 

FIELD: process engineering.

SUBSTANCE: invention relates to oil extraction equipment, particularly to methods of producing pistons for oil field mud pumps. Proposed method consists in placing prefabricated piston metal rod with elements design to fix elastic material on said rod. Core surface is preliminarily degreased, coated with adhesive glue and dried. Then elastic material is injected into mould cavity, moulded and cooled, and finished product is withdrawn therefrom. Note that thermoplastic polyurethane based on simple and complex polyesters is used as said elastic material that is injected into mould cavity in the form of thick homogeneous compound. Injection mould is preheated to 170-260°C. Moulding is performed during 1 to 5 minutes, then mould is cooled down for 2 to 15 minutes.

EFFECT: longer life of pistons, simplified production process, higher efficiency.

1 dwg