Free forging method for blowout preventer body used for petroleum drilling and production

Abstract

The invention discloses a free forging method for a blowout preventer body used for petroleum drilling and production. The forging method includes the steps of firstly, compiling a forging process forging drawing; secondly, calculating the weight of a forging, and conducting blanking; thirdly, determining the blanking specification; fourthly, determining a forging device, a heating device and the forging temperature range; fifthly, determining the forging heating number and the post-forge cooling mode; sixthly, implementing forging, wherein blanking is conducted, materials are input into a furnace at a high temperature, the materials are taken out of the furnace to be forged, a blank is taken out of the furnace and perpendicularly arranged on a lower anvil, slight tampering is conduced once so that oxide skin can falloff, a forging party is drawn out in the axial direction, a cuboid blank is obtained after forging is conducted, bulges are formed at the two ends of the cuboid blank through a riveting and tampering method, the surface is flattened, an indentation is formed through small round steel, the blank is put into the furnace to be heated again, one end is drawn out to be forged into the diameter size of a flange from the position of the indentation, a neck of the flange is pressed through a clamp, a flange at the other end is heated and forged again, rectification is conducted, cooling is conducted, and the blowout preventer body is obtained. By means of the method, the integral flow line of the forging is ensured, cost is reduced, and quality is improved.

Description

technical field [0001] The invention belongs to the technical field of mechanical equipment manufacturing, and relates to a free forging method for a blowout preventer body used in an oil drill. Background technique [0002] The shape of the preventer body is as figure 1 , The BOP body tends to adopt integral forging, the middle part is asymmetrical square, and the two ends are flange structures. The product quality requirements are high and forging is difficult. [0003] There are two existing manufacturing methods, one is split forging, the middle is first forged into a square, and the two ends are separately forged into flanges, and then assembled and welded together, which is labor-intensive and time-consuming; the other is forging as a whole into a square, However, the machining allowance is large, the material waste is huge, the forging flow line is incomplete, the overall quality is not good, and the quality cannot be improved. Contents of the invention [0004] T...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a free forging method using a blowout preventer body for an oil drill, which solves the problems in the prior art that the process is unreasonable, the combined manufacturing method is labor-intensive and time-consuming, and the overall forging processing allowance is large, and the material waste is huge.

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