A Plastic Forming Method of Titanium Alloy Shell with Large Length-to-Diameter Ratio

Abstract

The invention discloses a plastic forming method for a titanium alloy casing with a large aspect ratio. Heat the titanium alloy billet at 600°C, keep it warm for 2 hours, quickly heat it to 10°C-15°C below the phase transition point, and keep it warm for 30 minutes; then take out the titanium alloy billet, quickly put it into the preforming mold, close the mold, Extrude at a speed of / s. After the extrusion is completed, the mold is opened to take out the preform and cooled; then it is replaced into the final forming mold, and the extrusion pad in the final forming mold is heated and controlled to maintain a constant temperature. The concave die is heated in different areas and controlled to maintain a constant temperature in each area; after the blank heating step is repeated, the preformed blank is placed in the final forming mold, the mold is closed, and the titanium alloy preformed blank is subjected to tension-compression stress interaction using extrusion equipment Loaded extrusion forming finally completes the forming of the entire titanium alloy shell. The invention can solve the problems of high requirements for forming equipment of the titanium alloy shell with a large length-to-diameter ratio, insufficient tonnage and working height, and the process is simple and easy to operate, and the production efficiency is high.

Description

technical field [0001] The invention relates to a forming method of a titanium alloy casing with a large aspect ratio. Background technique [0002] As a high-quality light alloy widely used in the aerospace field, titanium alloy has the advantages of high strength, high toughness, and high corrosion resistance. Titanium alloy parts with length-to-diameter ratio have a long extrusion stroke and rapid temperature drop. If the heating temperature is not enough, extrusion cracks will easily occur, and the extrusion force will not continue to be formed; if the heating temperature is too high, it will form Wei's organization, resulting in a sharp drop in product extension. At present, the traditional forming process of reverse extrusion is generally used for the forming of titanium alloy shells. However, for titanium alloy shell components with large aspect ratios, the reverse extrusion process requires high equipment and tooling, and requires a table with sufficient space and s...

AI Technical Summary

Problems solved by technology

[0002] As a high-quality light alloy widely used in the aerospace field, titanium alloy has the advantages of high strength, high toughness, and high corrosion resistance. Titanium alloy parts with length-to-diameter ratio have a long extrusion stroke and rapid temperature drop. If the heating temperature is not enough, extrusion cracks will easily occur, and the extrusion force will not continue to be formed; if the heating temperature is too high, it will form Wei's organization, resulting in a sharp drop in product extension

At present, the traditional forming process of reverse extrusion is generally used for the forming of titanium alloy shells. However, for titanium alloy shell components with large aspect ratios, the reverse extrusion process requires high equipment and tooling, and requires a table with sufficient space and size. With a large enough extrusion tonnage, the material of the tooling also requires high wear resistance and heat resistance, and the wall thickness difference of the prepared titanium alloy shell is often difficult to control, so this type of titanium alloy shell with a large aspect ratio is often directly used Machining and manufacturing of large-diameter bars, compared with the process of plastic forming blanks, the performance of components is poor, the cost is high, and the efficiency is low

Images