Stainless steel centrifugal pump shell forming method

Abstract

The present invention belongs to the field of centrifugal pump making technology. The forming process of centrifugal pump shell of stainless steel includes: adopting outer mold with steel mold frame comprising three combined forming mold blocks inside outer mold steel jacket; setting the core mold in the bottom and the inner mold of polyurethane material on the core mold; setting the initially formed cap-shaped stainless steel pump shell blank between the outer mold and the inner mold; applying the pressure head with oil press onto the inner mold slowly to make the inner mold extrude the stainless steel pump shell blank so as to form the stainless steel pump shell; pushing up the top board in the bottom of the outer mold steel jacket to open the three forming mold blocks and to take out the formed centrifugal pump shell of stainless steel.

Description

Technical field: [0001] The invention relates to a forming method of a stainless steel centrifugal pump shell, which belongs to the field of centrifugal pump manufacturing. Background technique: [0002] Authorized announcement number CN1045811C, name "stamping and forming centrifugal pump and its manufacturing method", between the pump casing and the impeller, stamped by the expansion forming method into a gradually increasing cross-section along the direction of liquid flow, asymmetrical and uneven on the circumference The volute is in the shape of a volute, and the outlet of the volute communicates with the outlet bend neck of the variable-diameter elliptical section. Using the metal lotus-shaped split elastic combination concave die and polyurethane rubber as the internal punch, the metal plate with a thickness of 0.5-5.0 mm is punched and formed many times under normal temperature and high pressure. Its shortcomings: First, because the concave mold is a metal lotus-sha...

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Problems solved by technology

Its shortcomings: First, because the concave mold is a metal lotus-shaped split elastic combination, the steel plate located between the punch and the concave mold is in the stamping process of the top plate, the force on the steel plate is not only generated by the positive pressure of the punch , and the reverse pressure generated from the outer side of the elastic die and the matching top plate of the die, one positive and one reverse form multiple interactive bending forces, which are not only easy to generate during the forming process of the pump casing The concentration of hard force affects the service life of the pump casing, and a little carelessness can easily cause the pump casing to be brittle, which directly affects the molding quality and molding rate of the pump casing; secondly, the lack of a core mold in the molding mold causes the flow of the polyurethane rubber inner mold to be blocked, Part of the steel plate of the pump casing is overstretched, resulting in a decrease in strength and bearing capacity, which directly affects the service life of the pump casing; third, the forming die has a complex structure, high manufacturing costs, and high operation requirements. rod, otherwise it will not work

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