A Semi-hot Precision Die Forging Forming Process for Titanium Alloy Forgings

Abstract

The invention provides a titanium alloy forging semi-hot state precision die forging forming process. After titanium alloy bars are preheated through a machining die, a free forging device is adopted to forge the titanium alloy bars into billets with the shape and the size similar to those of die forgings, the surfaces of the billets are lubricated through a sprayer, and after the billets are heated, the titanium alloy billets are forged into common die forgings with the shape and the size similar to final precision die forgings through a common die forging device and the die; then burr cutting and surface processing are conducted, a closed precise forging die is adopted to complete precision die forging of final products, and then the final products are subjected to surface processing, heat processing and wet sand blasting. The surface roughness of each die forging is smaller than 3.2 micro meter, no trimming residue exists on the forgings, no streamline ends of the forgings are exposed, the machining allowance of machining surfaces of the forgings is smaller than 0.5 mm, the raw material consumption of the forgings is reduced, later machining workload for the forgings is greatly reduced, cost is saved, the fatigue property of the forgings is remarkably improved, and the service life of each forging is also remarkably prolonged.

Description

technical field [0001] The invention belongs to the technical field of thermal processing plastic forming of non-ferrous metal materials that are difficult to deform, and in particular relates to a semi-hot state precision die forging forming process for titanium alloy forgings. Background technique [0002] More than half of the output of high-quality titanium alloys, high-temperature alloys and aluminum alloys in industrially developed countries in the world is used in the aerospace industry, of which the aviation industry accounts for more than two-thirds. Compared with the forgings of ordinary machinery manufacturing products, aerospace forgings have the following characteristics: First, aerospace forgings generally use materials with high specific strength and specific stiffness, often use new materials, and constantly propose new and higher forging production technologies. requirements. Second, aviation forgings have higher requirements in terms of progress and qualit...

AI Technical Summary

Problems solved by technology

[0003] Due to the poor thermal processing performance of titanium alloys and the backward forging equipment and technology, titanium alloy forgings are mainly ordinary die forgings, and the number of precision die forgings with high-precision surfaces is very small, and related technical research is rarely reported.

The ordinary titanium alloy die forgings produced are usually supplied in the state of sand blowing and pickling. The surface is rough and there are a large number of pits and other defects, which reduces the fatigue performance of the product and greatly reduces its service life.

[0004] At present, most titanium alloy die forgings for aerospace use are produced by open die forging technology, and there are a lot of flash shear residues. There has been no specific requirement for the non-machined surface roughness of forgings, which is completely guaranteed by the manufacturing process of forgings, generally at 6.3 μm~12.5μm, which will affect the fatigue life of forgings

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