Forging technology for heavy disk forgings

Abstract

The invention relates to a forging technology for heavy disk forgings. The forging technology includes the steps of heating steel ingots to be forged, preserving the temperature, enabling the temperature of the center parts of the steel ingots and the temperature of the exteriors of the steel ingots to be identical and heating the steel ingots uniformly and thoroughly; drawing the steel ingots through an existing forging method, wherein the anvil width ratio is 0.8-0.9; drawing the steel ingots at a time with the reduction rate being at least 20% each time; in the square stage, adopting a WHF forging method, an SUF forging method or a TER forging method and adopting an anvil staggering and drawing technology; carrying out forging flatly and squarely in the height direction through a wide anvil forging method to form blanks; enabling the value of the ratio of the length of blanked work-blanks to the width of the blanks to be smaller than or equal to 1.5; and carrying out square forging, octagon chamfering, rounding and forging forming through an existing forging method to obtain the heavy disk forgings. According to the forging technology, compaction and forging penetration are carried out on the blanks in the drawing process, previous forging structures and streamlines are basically maintained after upsetting formation and are prevented from being damaged, the technical problems of tube plate forging are solved, the ultrasonic flaw detection qualification rate is close to 100%, the mechanical property is excellent, and the requirements of product performance can be completely met.

Description

technical field [0001] The invention belongs to the technical field of large-scale basic casting and forging for major equipment, and relates to a forging process for large-scale basic casting and forging for equipment such as electric power, metallurgy, petrochemical, nuclear power, shipbuilding, railway, mine, aerospace, military industry, engineering, etc., and particularly relates to a large-scale Cake forging forging process. Background technique [0002] Cake forgings are solid forgings, which are one of the typical forgings forged on hydraulic presses, and require high-quality large steel ingots to be directly forged. The forging process of large-scale cake forgings has always been one of the most difficult forging technologies to master in large-scale forgings, because steel ingots have their inherent defects, such as segregation, inclusions, loose, coarse columnar crystals, etc.; with the improvement of metallurgical quality, these Defects can be reduced, but not e...

AI Technical Summary

Problems solved by technology

The essence of the cake forging process is to solve the forging process, compaction process, prevent inclusion cracks and effectively reduce the forging process of sheet inclusions. Since the final forming process of the traditional cake forging is upsetting, generally upsetting Relatively large, especially in the center where the deformation is severe, the strain state is longitudinal compression, two-way tension, and the streamlined inclusions formed by the pre-elongation are compressed and deformed to form sheet-like inclusions, resulting in an increase in the area of ​​the inclusions and inevitably becoming sheets. shape, that is, the subsequent upsetting deformation destroys the refinement and dispersion of the pre-sequence elongation on the inclusions. The result reflected in the ultrasonic flaw detection is that a large area of ​​​​intensive defects appears in a certain area of ​​​​the center, resulting in the failure of the ultrasonic flaw detection. qualified

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