Medium And Large Sized Butterfly Valve Body's Foam Mold CAD And Quality Control For The Foam Pattern

The paper explores the possibility of applying LFC to produce medium and large-sized butterfly valve body, emphatically studies the three dimensional CAD of the foam mold and the quality control for the foam pattern. Referencing the knowledge of three dimensional CAD about foam mold and the design experience of small-sized butterfly valve body′s foam mold, the three dimensional CAD of medium and large-sized butterfly valve body′s foam mold are completed. Aiming at the foam pattern of medium-sized butterfly valve body (DN500 and DN600) wholly molding on simple vertical machine, a particular mold structure of opening and closing by machine integrating demoulding manually is brought forward. After negating the feasibility of large-sized butterfly valve body's foam pattern (DN900, DN1000 and DN1200) wholly molding on simple vertical machine, the reasonable foam pattern′s slicing project of large-sized butterfly valve body is put forward, not only well utilizing the present molding machines, but also making the cost of the molds fall greatly. The molds are successfully debugged on simple vertical machines, through debugging, the molding technics of EPS foam patterns is acquired, and the foam patterns' quality is well controlled, finally the mass production of the foam patterns is realized. The technical guidance is processed for casting production, and the mass production of the cast is realized. The casts' quality is recognized by customers.