A kind of extrusion forging method of large-diameter long tube billet
A technology of extrusion forging and large diameter, which is applied in the direction of metal extrusion dies, metal processing equipment, etc.
Active Publication Date: 2019-02-01
YANTAI TAIHAI GRP CO LTD
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Problems solved by technology
[0003] Aiming at these shortcomings, the present invention proposes a technical solution combining extrusion and forging to realize the hot forging billet of the hydraulic press to solve the problem that the hydraulic press cannot back-extrude large-diameter, long-size (about 5 meters) tube blanks Problems, improve product efficiency, reduce costs
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[0019] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not to limit the scope of the present invention.
[0020] A method for extrusion and forging of large-diameter long tube blanks, characterized in that the following processing steps are performed:
[0021] The first step is to make a billet, heat the electroslag ingot to 1180°C in a forging furnace, and hold it for 10 hours, then press the clamp handle on the upper end of the electroslag ingot by a hydraulic press, and then perform the upsetting of the leakage disc. After that, it is clamped by the operating machine Hold, use the upper flat anvil and the lower V anvil to elongate the billet, and cut off both ends of the elongated electroslag ingot to obtain a rod-shaped solid billet in the middle section;
[0022] The second step, back extrusion punching and leakage: the above-mentioned...
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The invention relates to an extrusion forging method of a large-diameter long pipe billet. The method comprises the following steps in sequence: billet making, backward extrusion punching and materialleaking and pipe billet drawing out. The billet making process comprises the steps that an electroslag ingot is heated and subject to heading drawing, and the two ends are cut off; the backward extrusion material leaking comprises the steps that a relay punch is used for carrying out backward extrusion on the billet, when the distance between the head of the relay punch and the upper end face ofa small chassis of a mold reaches 200 mm to 300 mm, backward extrusion operation is stopped, the mold small chassis is removed, extrusion continues, and after material leaking is finished, the pipe billet is formed; the pipe billet is drawn out until the relay punch in the pipe billet is taken out, a backward extrusion mold is moved away, and an upper flat anvil and a lower flat anvil are used forimplementing core bar drawing out on the step of the reserved drawing length. The method is simple, and the product quality is stable.
Description
technical field [0001] The invention relates to an extrusion forging method for a large-diameter long tube blank, and belongs to the technical field of metal processing. Background technique [0002] The main pipeline of nuclear power is the pipeline connecting the main equipment of the primary coolant system of the reactor, and its soundness is related to the safety of the nuclear power system in the whole life cycle. In order to ensure the 60-year lifespan of the nuclear power system, the nuclear power main pipeline has been improved from the two-and-a-half-generation casting main pipeline to the third-generation forging main pipeline. The third-generation nuclear power main pipeline is made of 316LN stainless steel, which has large deformation resistance during forging and improper control of process parameters, which is prone to forging cracks. At present, there are still a lot of problems in the process of producing pipes, and the quality of the products cannot be guar...
Claims
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IPC IPC(8): B21J5/08B21J5/06B21C23/20B21C25/02
CPCB21C23/205B21C25/02B21J5/06B21J5/08
Inventor 杨运民王雪欣刘志颖曹新建
Owner YANTAI TAIHAI GRP CO LTD