Composite molding method for thick helical blades

Abstract

The invention relates to the technical field of spiral blade forming machining, and particularly relates to a composite forming method for a thick spiral blade. The method comprises the following steps that a, blanking is carried out, and a plane body spiral blade blank blanking graph is calculated according to a spiral blade expansion calculation formula; b, a plane body spiral blade blank is heated, and the plane body spiral blade blank is converted into austenite at the high temperature; c, the plane body spiral blade blank is drawn, the first end of the edge of an inner hole notch of the high-temperature plane body spiral blade blank is fixed, the second end of the edge of the inner hole notch of the high-temperature plane body spiral blade blank is drawn through hoisting equipment, the inner spiral line of the spiral blade is stretched to the required size, and the plane body spiral blade blank is initially formed into a spiral blade; and d, the initially-formed spiral blade is placed on a prefabricated spiral mold, and pressure is applied to the prefabricated spiral mold through a press machine to press the prefabricated spiral mold into a standard thick spiral blade. According to the method, the inner diameter and the outer diameter of the formed spiral blade can be guaranteed, the method is suitable for mass production of thick spiral blades, the efficiency is high, andthe forming quality of the spiral blade is stable.

Description

technical field [0001] The invention relates to the technical field of forming and processing of spiral blades, in particular to a compound forming method for thick spiral blades applied to spiral blades of screw conveyors, shaft drilling machines and the like. Background technique [0002] At present, large thick spiral blades are generally cast and formed, and small thin spiral blades are generally formed by cold pressing. Because the spiral blade is a special space surface shape, casting is difficult and the cost of casting is relatively high. The flow space of cast metal is relatively narrow, and the melting of metal Poor fluidity leads to poor material performance; cold press forming is suitable for small spiral blades or spiral blades with low pressure, and the forming is easy to rebound and irregular. Large thick helical blades are formed by cold drawing or direct hot pressing or cold pressing. Cold drawing forming does not have strict requirements on curved surfaces,...

AI Technical Summary

Problems solved by technology

[0002] At present, large thick spiral blades are generally cast and formed, and small thin spiral blades are generally formed by cold pressing. Because the spiral blade is a special space surface shape, casting is difficult and the cost of casting is relatively high. The flow space of cast metal is relatively narrow, and the melting of metal Poor fluidity leads to poor material properties; cold press forming is suitable for small spiral blades or spiral blades with low pressure, and the forming is easy to rebound and irregular

Large thick helical blades are formed by cold drawing or direct hot pressing or cold pressing. Cold drawing forming does not have strict requirements on curved surfaces, and the inner and outer diameters of direct pressing forming cannot be well controlled.

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