A method for removing support structures in additively manufactured titanium alloys

A support structure and additive manufacturing technology, which is applied in the directions of additive manufacturing, additive processing, and process efficiency improvement, can solve the problems of easy addition and removal of support structures, etc. Effect

Active Publication Date: 2020-09-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the above problems, the purpose of the present invention is to provide a method for removing the support structure in the additive manufacturing of titanium alloys, which can quickly and completely remove the support structure without damaging the formed parts, and solve the problem that the support structure is easy to add at the present stage. Remove difficult problems to further expand the application field of additive manufacturing technology

Method used

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  • A method for removing support structures in additively manufactured titanium alloys

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Effect test

Embodiment 1

[0036] In the present embodiment, the method for removing the support structure of TC4 titanium alloy additive manufacturing technology includes the following steps:

[0037] (1) Use an explosion-proof vacuum cleaner, a mechanical vibrating table and high-pressure gas to clean the internal structure of the molded part, and remove the residual powder and other redundant parts;

[0038] (2) Perform vacuum heat treatment at 600°C / 2h on the cleaned molded parts, and cool to room temperature in the furnace;

[0039] (3) Use hydrofluoric acid, nitric acid and water with a volume ratio of 1 / 3 / 1 to treat the surface of the molded part, remove surface sticky powder, and reduce the surface roughness of the molded part. The treatment method is soaking; wherein, hydrogen The concentration of hydrofluoric acid is 35wt%, and the concentration of nitric acid is 66wt%;

[0040] (4) adopt hydrofluoric acid, nitric acid and the solution that water volume ratio is 1 / 2 / 9 to process support struc...

Embodiment 2

[0046] In the present embodiment, the method for removing the support structure of TC6 titanium alloy additive manufacturing technology includes the following steps:

[0047] (1) Use an explosion-proof vacuum cleaner, a mechanical vibrating table and high-pressure gas to clean the internal structure of the molded part, and remove the residual powder and other redundant parts;

[0048] (2) Perform vacuum heat treatment at 800°C / 1h on the cleaned molded parts, and cool the furnace to room temperature;

[0049] (3) Using hydrofluoric acid, nitric acid and a solution with a volume ratio of 1 / 5 / 3 to treat the surface of the molded part, remove surface sticky powder, and reduce the surface roughness of the molded part. The treatment method is soaking; wherein, hydrogen The concentration of hydrofluoric acid is 36wt%, and the concentration of nitric acid is 65wt%;

[0050] (4) adopt hydrofluoric acid, nitric acid and the solution that water volume ratio is 1 / 3 / 7 to process support s...

Embodiment 3

[0056] In this embodiment, the method for removing the support structure of TC11 titanium alloy additive manufacturing technology includes the following steps:

[0057] (1) Use an explosion-proof vacuum cleaner, a mechanical vibrating table and high-pressure gas to clean the internal structure of the molded part, and remove the residual powder and other redundant parts;

[0058] (2) Perform vacuum heat treatment at 800°C / 0.5h on the cleaned molded parts, and cool to room temperature in the furnace;

[0059] (3) Using hydrofluoric acid, nitric acid and a solution with a volume ratio of 1 / 4 / 1 to treat the surface of the molded piece, remove surface sticky powder, and reduce the surface roughness of the molded piece. The treatment method is soaking; wherein, hydrogen The concentration of hydrofluoric acid is 37wt%, and the concentration of nitric acid is 67wt%;

[0060] (4) The support structure is treated with hydrofluoric acid, nitric acid and water with a volume ratio of 1 / 2 / ...

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Abstract

The invention relates to the field of additive manufacturing of titanium alloys, in particular to a method for removing support structures in the additive manufacturing of titanium alloys. The method comprises the following steps: 1) using an explosion-proof vacuum cleaner, a mechanical vibrating table and high-pressure gas cleaning to clean up the residual powder inside the molding; 2) vacuum heat-treating the cleaned molding; 3) using hydrofluoric acid, nitric acid and Water solution, full nitric acid solution to treat the surface of molded parts; 4) use hydrofluoric acid, nitric acid and water solution and perhydrofluoric acid solution to treat the support structure; 5) use hydrofluoric acid, nitric acid and water solution And the full nitric acid solution is used to carry out surface treatment on the molded parts after the support is removed; 6) the processed molded parts are subjected to abrasive flow treatment; 7) the processed molded parts are subjected to vacuum heat treatment to eliminate the adverse effects of H elements. Thus, the support structure can be removed quickly and completely without damaging the molded part.

Description

technical field [0001] The invention relates to the field of additive manufacturing of titanium alloys, in particular to a method for removing support structures in the additive manufacturing of titanium alloys. Background technique [0002] Titanium is an important structural metal developed in the 1950s. Due to its low density, high specific strength, good corrosion resistance and biocompatibility, titanium alloys have been widely used in aviation, aerospace, shipbuilding, etc. Shipbuilding, chemical industry, metallurgy, biomedical and other fields are known as "strategic metals" and "space metals". However, due to the high deformation resistance of titanium alloys and poor cutting process performance, the traditional subtractive method is used to manufacture large titanium alloy components with long period, high cost, difficult manufacturing, and difficult to prepare complex components, which also limits the application of new structures. Compared with traditional manuf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B33Y10/00B33Y30/00
CPCB33Y10/00B33Y30/00B22F10/00B22F10/62B22F10/64B22F10/68B22F10/20B22F10/40Y02P10/25
Inventor 蔡雨升吉海宾雷家峰杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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