Method for machining TC4-DT titanium alloy large-specification slab forged piece

Abstract

A method for machining TC4-DT titanium alloy large-specification slab forged piece comprises the following steps: billet forging, intermediate forging, high-low circulating forging, inverting upsetting forging and shaping forging. The method is characterized in that: the large-specification forging stock is adopted for integral forging according to the method; compared with a prior-art small-specification forging blank repeated upsetting forging technique, at a state that the upsetting deformation blank height-to-diameter ratio is restricted, single weight of the forged piece is greatly improved and reaches up to above one ton; according to the deformation role in metal pressure machining, appropriate forging starting temperature and forging finishing temperature are selected, and the technical parameters are reasonably matched; the metal sufficiently deforms in a transverse direction in the forging process; forming penetration efficiency is improved; actual deformation amount and deformation uniformity of the large-specification forged piece are increased; and capability of the product for satisfying the requirement is ensured. The method further has the following advantages: capability of realizing full mechanical operation in the forged piece production process, reduced manual operation arbitrainess, large forging pressure, reduced times of heating, high batch quality consistency, high ultrasonic flow detection grade, and greatly reduced production period.

Description

technical field [0001] The invention relates to the field of titanium and titanium alloy processing, in particular to a processing method for large-scale thick plate forgings of TC4-DT titanium alloy. Background technique [0002] Ti-6Al-4V ELI (domestic similar brand TC4-DT) is a medium-strength (860MPa level) damage-tolerant titanium alloy. Because of its excellent processing performance and high damage tolerance performance, it meets the requirements of the large-scale overall structure of the F-22 aircraft. The manufacturing requirements of the main load-bearing components have greatly increased the amount of titanium alloy used in the aircraft to achieve the purpose of high weight reduction. Therefore, Ti-6Al-4V ELI titanium alloy has been widely used in F-22 fighters. The fuselage of each F-22 fighter needs to consume 36 tons of titanium materials. The United States plans to produce 278 F-22 fighters by 2011. 22 fighter jets (and supporting engines) consume nearly 10,...

AI Technical Summary

Problems solved by technology

However, in the domestic Ti-6Al-4V ELI titanium alloy large-scale forging production method at present, in order to ensure uniform structure and performance and meet the requirements of high performance and structure, repeated upsetting and drawing forging are required, and the upsetting and drawing forging is completed by manual clamping. Limited by the upsetting and drawing forging operation method, the production cycle of domestic Ti-6Al-4V ELI titanium alloy large-scale forgings is long, the number of fires is high, the unit weight of forgings is small, the quality consistency is poor, and the ultrasonic flaw detection level is low

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