Forging backward extrusion technology of three-way pipe

Abstract

The invention relates to the technical field of the preparation of a three-way pipe, in particular to a forging backward extrusion technology of the three-way pipe, comprising the steps of (1) extrusion of a forge bar: heating the forge bar to a forging temperature according to the material of the forge bar, horizontally placing the forge bar at the position corresponding to a main pipe in a three-way pipe forging mould, synchronously extruding and perforating the two ends of the forge bar by using two top cylinders, and performing backward extrusion on the main pipe in the forging mould to form a bump while forming the main pipe; and (2) performing backward extrusion and perforation by an upper top cylinder: using the upper top cylinder to perform backward extrusion and perforation downwards from the upward side of the bump, so as to form the three-way pipe. Compared with the prior art, the invention uses an integrated forging mould, ensures one-step molding, reduces technical energy consumption, greatly improves production efficiency, also cleans surface scale, and ensures smooth surface quality, proper product shape molding and excellent size. The height of the prepared branched pipe is increased by 30-60% compared with original technologies, so that welding and shooting are convenient; the pipe does not expand and explore easily; and the safety performance of running equipment is improved.

Description

[technical field] [0001] The invention relates to the technical field of preparation of three-way pipes, in particular to a forging and back-extrusion process of three-way pipes. [Background technique] [0002] At present, the leading production method of large-scale tees in the world is to use special molds at both ends of the forged pipe to gradually shrink in one direction. Generally, it takes seven to eight fires to heat and forge to form. Low energy consumption, high energy consumption, and poor product surface quality, because after each heating, oxide scales will be generated on the product surface. After the first heating, that is, after the first fire, it is easier to remove the oxide scale on the surface, but Since the second fire, due to the limitation of the mold, the scale on the surface cannot be removed, resulting in the accumulation of scale defects; at the same time, the height of the branch pipe prepared by this process is low, which makes subsequent weldin...

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Problems solved by technology

[0002] At present, the leading production method of large-scale tees in the world is to use special molds at both ends of the forged pipe to gradually shrink in one direction. Generally, it takes seven to eight fires to heat and forge to form. Low energy consumption, high energy consumption, and poor product surface quality, because after each heating, oxide scales will be generated on the product surface. After the first heating, that is, after the first fire, it is easier to remove the oxide scale on the surface, but Since the second fire, due to the limitation of the mold, the scale on the surface cannot be removed, resulting in the accumulation of scale defects; at the same time, the height of the branch pipe prepared by this process is low, which makes subsequent welding and filming difficult; and the welding seam and branch pipe neck If the distance between the two stress areas at the top is too short, it is easy to cause tube expansion and tube burst in this area

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