Injection molding method for titanium alloy assembly

Abstract

The invention relates to an injection molding method for a titanium alloy assembly. The injection molding method comprises the following steps that S1, multiple kinds of fed materials are prepared, wherein multiple kinds of fed materials are prepared according to the quantity of different material parts of a final product; S2, injection molding of a green body is achieved, wherein one kind of fed material is selected and is injected in a corresponding mold to obtain a primary green body, the primary green body is put into the corresponding mold to serve as an insert, another kind of corresponding fed material is selected for secondary injection to obtain a semi-finished green body, if the semi-finished green body at the moment is not a final green body piece for preparing the final product, the semi-finished green body obtained last time continues to be put into the corresponding mold to serve as an insert, and a corresponding fed material is selected to continue to be injected until the final green body piece for preparing the final product is obtained; S3, the final green body piece is degreased, and a degreased blank is obtained; and S4, the degreased blank is sintered, and the final product is obtained. According to the method, the welding process during titanium metal product connection can be replaced to a certain degree, and the connection effect between all components is outstanding.

Description

technical field [0001] The invention relates to the field of injection molding in powder forming technology, in particular to an injection molding method for titanium alloy components. Background technique [0002] Titanium metal products generally include pure titanium products and titanium alloy products. When two titanium metal products need to be connected, welding is usually used for connection. Due to the high chemical activity of titanium and titanium alloys, it is easy to be polluted by oxygen, nitrogen, and hydrogen. Before welding, it is necessary to carry out surface treatment for degreasing, descaling, and deoxidizing film. The welding process needs to strictly control the concentration of air and water vapor in argon. content, welding is difficult, and the cost is high. The reasons for the difficulty of welding are: 1) The gap between oxygen and nitrogen is solid-fused in titanium, which will distort the titanium lattice and reduce the plasticity and toughness...

AI Technical Summary

Problems solved by technology

Due to the high chemical activity of titanium and titanium alloys, it is easy to be polluted by oxygen, nitrogen, and hydrogen. Before welding, it is necessary to carry out surface treatment for degreasing, descaling, and deoxidizing film. The welding process needs to strictly control the concentration of air and water vapor in argon. content, welding is difficult, and the cost is high

The reasons for the difficulty of welding are: 1) The gap between oxygen and nitrogen is solid-fused in titanium, which will distort the titanium lattice and reduce the plasticity and toughness; 2) The increase of hydrogen will make the impact toughness of titanium weld metal drop sharply, and The plasticity drops a little, and the hydride will cause the brittleness of the joint; 3) When welding, the oil stain of the workpiece and the welding wire can increase the carbon content, and when the carbon content exceeds the solubility, hard and brittle TiC is formed, which is distributed in a network and is prone to cracks;

[0003] 4) The elastic modulus of titanium is about half smaller than that of steel, so the welding residual deformation is relatively large, and it is difficult to correct the deformation after welding; 5) The welded joint is prone to overheating structure, and the grains become coarse, especially for β titanium alloys. It is easy to cause a decrease in plasticity and a greater tendency to cold cracking

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