Forming process of complicated titanium alloy investment casting pipeline

Abstract

The invention discloses a forming process of a complicated titanium alloy investment casting pipeline. The process is characterized in that the pipeline is made of pure titanium or the same material as that of a casting, which has good elongation and toughness, so that the pipeline with large length-diameter ratio and complicated shape can be formed. The process comprises the steps of preparing a titanium pipe, mounting the pipe with a wax mold, roasting a mold case at a low temperature, roasting the mold case at a high temperature and casting. With the adoption of the forming process, the combining gap between the pipe and a body is small, the requirements of the pipeline on sealing and pressure proof can be met, the requirements of the forming process of the casting pipelines in various shapes can be met, the difficulty in a casting technique is reduced, the disadvantages of difficult cleaning and limited use are overcome, the casting surface quality is ensured, the production cycle is shortened, the casting production cost is saved, the deformation in the cast procedure is reduced, and the quality of an actual casting is further improved.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy investment casting, and relates to a complex pipeline forming process of titanium alloy investment casting. Background technique [0002] As a traditional casting process, investment casting is widely used in aviation, aerospace, weapons, electronics, ships and other industries. The traditional titanium alloy casting pipeline is mainly formed by the core forming method. The details are on pages 88 to 91 of "Titanium and Titanium Alloy Casting" edited by Xie Chengmu. For simple pipelines with large diameters (≥φ20), and there is no more than one position where the bend is greater than 90 degrees, it is generally formed by direct coating and shelling; for large diameters (between φ10 and φ20), the length is small (≤100) castings are relatively simple pipelines, and there are no more than two positions where the bend is greater than 90 degrees, and ceramic cores are generally used; but for lo...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of complex pipe forming of titanium alloy castings in the prior art, and provide a simple, economical, operable and reliable process for forming complex pipes of titanium alloy investment castings

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