Combined split mold once extrusion forming method with large flange middle through body

Abstract

The invention discloses a combined split mold once extrusion forming method with a large flange middle through body, and meanwhile, discloses a vertical double-acting extrusion combination mold of combined split molds. Left / right horizontal concave molds are closed to form a peripheral mold cavity; upper / lower vertical extrusion molds and the closed left / right horizontal concave molds form an axial mold cavity of a flange; upper / lower vertical perforating tools are arranged in the upper / lower vertical extrusion molds; and water cooling devices are arranged in perforating needles. The forming method comprises the steps of preheating of the combination mold, returning of the molds to a given initial position, placement and positioning of heated blanks, horizontal mold closing, vertical double-acting extrusion and demolding after extrusion shaping; the once extrusion forming of the vertical double-acting extrusion combination mold is realized; each mold can be independently operated to move; the reasonable flowing of metal can be flexibly controlled to prevent folding defects; the flange part is fully filled with metal, so that products only need one-fire heating and once extrusion forming; and the method is short in procedure flow, low in energy consumption, high in efficiency and precise in size of the products.

Description

technical field [0001] The invention relates to a one-time extrusion forming method of a combined split mold with a large flange centered body, and belongs to the technical field of metal plastic forming. Background technique [0002] The whole body with large flanges is a key component in oil and gas exploration, as well as chemical, nuclear power and other pipeline technology equipment, and is used for the connection of wellhead devices, Christmas tree equipment and pipelines. Products produced by traditional casting and welding methods have poor overall structural strength and low performance, and it is difficult to meet the performance requirements of high pressure; when free forging is used, due to the complex structure of the forging, it must be heated multiple times, resulting in high energy consumption, low efficiency, and The material utilization rate is low, and a large amount of material must be removed by machining to form a flange and a hollow shape. The metal f...

AI Technical Summary

Problems solved by technology

Products produced by traditional casting and welding methods have poor overall structural strength and low performance, and it is difficult to meet the performance requirements of high pressure; when free forging is used, due to the complex structure of the forging, it must be heated multiple times, resulting in high energy consumption, low efficiency, and The material utilization rate is low, and a large amount of material must be removed by machining to form a flange and a hollow shape. The metal flow line of the material is cut off, and the stress corrosion of the medium causes early failure and affects the service life; it adopts a one-way overall During die forging, due to the large diameter of the flange side, it is difficult to fill the die cavity, and folding defects are prone to occur, and the inner hole cannot be formed. Generally, preforms are required, leaving a demoulding slope, and the material utilization rate is also low, and the shape will be produced. Larger flash, need to increase trimming process, flash removal and inner hole machining will also cause the problem of metal flow line being cut off

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