Selective laser melting and forming method of titanium alloy asymmetric protection shield

A technology of laser selective melting and protective cover, which is applied in the coating process and coating of metal materials, can solve the problems of improper control, complex stress, warping and deformation, etc., and achieve the elimination of residual stress, ensure the quality of forming, and reduce the temperature gradient effect

Active Publication Date: 2017-05-24
CAPITAL AEROSPACE MACHINERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor overall stiffness of the product, during the SLM forming process, the components undergo high-frequency complex thermal cycles, resulting in complex stresses, prone to warping and deformation, improper control and even cracks, collapse and other problems

Method used

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  • Selective laser melting and forming method of titanium alloy asymmetric protection shield
  • Selective laser melting and forming method of titanium alloy asymmetric protection shield

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] A method for laser selective melting and forming of a titanium alloy asymmetric protective cover according to the present invention, the titanium alloy asymmetric protective cover is a semi-open thin-walled flexible structure with a wall thickness of 2 mm, and the method includes the following steps:

[0027] (a) Design of external restraint structure

[0028] Design an additional restraint structure 2 at the opening of the protective cover 1 by three-dimensional solid modeling software to ensure that the protective cover 1 has sufficient rigidity, and the wall thickness of the additional restraint structure is 0.9 mm;

[0029] (b) Preparation of titanium alloy powder

[0030] Sieve the titanium alloy powder through a powder sieving machine to ensure that the powder particle size is -400 mesh;

[0031] Put the sieved titanium alloy powder into a drying box to remove the moisture absorbed in the powder, set the powder baking temperature to 90°C, and the powder baking ti...

Embodiment 2

[0041] A laser selective melting forming method for an asymmetric titanium alloy protective cover according to the present invention, wherein the asymmetric titanium alloy protective cover has a semi-open thin-walled flexible structure with a wall thickness of 1 mm, and the method includes the following steps:

[0042] (a) Design of external restraint structure

[0043] Design the additional restraint structure 2 at the opening of the protective cover 1 by three-dimensional solid modeling software to ensure that the protective cover 1 has sufficient rigidity, and the wall thickness of the additional restraint structure is 0.8mm;

[0044] (b) Preparation of titanium alloy powder

[0045] Sieve the titanium alloy powder through a powder sieving machine to ensure that the powder particle size is -400 mesh;

[0046] Put the sieved titanium alloy powder into a drying box to remove the moisture absorbed in the powder, set the powder baking temperature to 80°C, and the powder baking...

Embodiment 3

[0055] A method for laser selective melting and forming of a titanium alloy asymmetric protective cover according to the present invention, the titanium alloy asymmetric protective cover is a semi-open thin-walled flexible structure with a wall thickness of 2 mm, and the method includes the following steps:

[0056] (a) Design of external restraint structure

[0057] Design an additional restraint structure 2 at the opening of the protective cover 1 by three-dimensional solid modeling software to ensure that the protective cover 1 has sufficient rigidity, and the wall thickness of the additional restraint structure is 1 mm;

[0058] (b) Preparation of titanium alloy powder

[0059] Sieve the titanium alloy powder through a powder sieving machine to ensure that the powder particle size is -400 mesh;

[0060] Put the sieved titanium alloy powder into a drying box to remove the moisture absorbed in the powder, set the powder baking temperature to 100°C, and the powder baking tim...

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Abstract

The invention provides a selective laser melting and forming method of a titanium alloy asymmetric protection shield. The method includes the following steps of (1) design of an additional constraint structure; (2), preparation of titanium alloy powder; (3), selective laser melting and forming of a protection shield product; (4), distressing and annealing; (5), linear cutting to take off the product and removal of the additional constraint structure. Stress deformation of a thin wall flexible component is controlled through an additional constraint condition; due to the fact that the product is of a thin wall flexible structure, buckling deformation is generated easily through direct forming, the additional constraint structure is added to the opening portion of the protection shield, the overall rigidity of the product is improved, and forming quality is guaranteed. Distressing and annealing treatment is performed, an optimized heat treatment system is adopted to perform distressing treatment on a forming part with the additional constraint structure, liner cutting is performed after residual stress is eliminated to remove the additional constraint structure, and product size precision is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of laser selective melting and forming, and relates to a method for laser selective melting and forming of a titanium alloy asymmetric shield. Background technique [0002] Selective Laser Melting (SLM for short) technology belongs to the field of laser additive manufacturing. It adopts high-energy laser to melt thin powder layers in a loose state. Density of 3D parts. [0003] Titanium alloy asymmetric protective cover is generally used as a protection device for components in aerospace vehicles. It is a semi-open thin-walled flexible structure, and the wall thickness is generally 1-2mm. Due to the poor overall rigidity of the product, during the SLM forming process, the components undergo high-frequency complex thermal cycles, resulting in complex stresses, prone to warping and deformation, improper control and even cracks, collapse and other problems. Contents of the invention [0004] The invention p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/106
Inventor 王国庆陈济轮梁晓康严振宇黄超刘天亮王志诚何京文
Owner CAPITAL AEROSPACE MACHINERY
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