One-time extrusion forming method of horizontal double-action combined die with double-flange middle body

Abstract

The invention discloses a one-time extrusion forming method of a horizontal double-acting combined mold of a double-flange middle body. Meanwhile, the method discloses a horizontal double-acting extrusion combined mold for vertical parting, the vertical upper female die and the vertical lower female die form a circumferential die cavity during die closing, the left horizontal extrusion die and theright horizontal extrusion die form an axial die cavity of the flange together with the vertical upper female die and the vertical lower female die after the die closing, the left horizontal punchingneedle and the right horizontal punching needle are arranged in the left horizontal extruding die and the right horizontal extruding die respectively, a water cooling device is arranged in each penetrating pin, the top head is arranged in the vertical downward concave die, wherein the vertical mold, the horizontal extrusion mold and the perforation tool can move independently. By utilizing the stroke of the extrusion head and the punching needle, the metal can be flexibly controlled to flow reasonably, and the folding defect is avoided, the metal filling of the flange part is full, the product can be formed only by one-time heating and one-time extrusion, the process flow is short, the energy consumption is low, the efficiency is high, and the product size is accurate.

Description

technical field [0001] The invention relates to a one-time extrusion forming method of a horizontal double-action combined mold with a whole body in a double flange, and belongs to the technical field of metal plastic forming. Background technique [0002] The middle body of large double flanges is a key component in petroleum and natural gas exploration, as well as chemical and nuclear power pipeline technology and 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...

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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 double 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; the use of one-way In the overall die forging, due to the large diameter of the flanges on both sides, it is difficult to fill the die cavity, and folding defects are prone to occur, and the inner hole cannot be formed. Generally, a preform is required, with a demoulding slope, and the material utilization rate is also low. Large flashes will be generated, and the trimming process needs to be increased. Flash cutting and inner hole machining will also cause the problem of metal flow lines being cut off; some use vertical extrusion methods, which can only form one flange at a time, and need to The workpiece is turned around and extruded again to form another flange. The process is complicated and the efficiency is low, and it cannot be guaranteed to be completed in one fire.

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