Laser additive manufacturing method for synergistically improving surface precision and strength of titanium alloy

A laser additive and surface precision technology, applied in the field of laser additive manufacturing and laser-powder coupling, which can synergistically improve the surface precision and strength of titanium alloys, can solve the problems of increased cycle and cost, high cost, and difficulty in speeding up, and achieve organizational Controllable, synergistic improvement of surface precision and strength, and high surface precision

Inactive Publication Date: 2019-12-03
SHANGHAI AIRCRAFT DESIGN & RES INST COMML AIRCRAFT OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing manufacturing processes of titanium alloys, such as casting, forging, machining and other forming titanium alloys, involve high cost, long cycle time, and difficulty in speeding up. Low efficiency, etc., unable to achieve high complexity, high degree of freedom, controllable organization, low cost, short cycle integration and integrated component manufacturing
In addition, in some special application environments, the surface modification of titanium alloy parts (such as: surface strengthening, smoothness, etc.) still requires additional processing steps, which further increases the cycle and cost
[0004] At present, the existing methods cannot use one process to simultaneously achieve high complexity, high surface precision and surface self-strengthening of titanium alloy parts.

Method used

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  • Laser additive manufacturing method for synergistically improving surface precision and strength of titanium alloy
  • Laser additive manufacturing method for synergistically improving surface precision and strength of titanium alloy
  • Laser additive manufacturing method for synergistically improving surface precision and strength of titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Specific steps are as follows:

[0035] (1) The Ti6Al4V alloy powder within the particle size range of 15-50 μm is evenly loaded into the laser powder bed additive manufacturing powder feeder, with consistent quality, dryness and no agglomeration;

[0036] (2) Level the substrate of the forming cabin of the powder bed equipment, rush into the argon protection, the outlet pressure of the argon protection gas is 1-6KPa, and reduce the oxygen content in the cabin to below 100ppm;

[0037] (3) The Ti6Al4V alloy powder is evenly and continuously pre-laid on the forming substrate, and the parameters of the laser power 280W, scanning speed 1100mm / s, spot size 100μm, scanning distance 80μm, and powder coating thickness 30μm are used to print the internal entity of the test piece forming;

[0038] (4) Use the parameters of laser power 150W, scanning speed 1300mm / s, spot size 100μm, and powder coating thickness 30μm to print the outer contour of the specimen, and the thickness o...

Embodiment 2

[0041] Specific steps are as follows:

[0042] (1) The Ti6Al4V alloy powder within the particle size range of 15-50 μm is evenly loaded into the laser powder bed additive manufacturing powder feeder, with consistent quality, dryness and no agglomeration;

[0043] (2) Level the substrate of the forming cabin of the powder bed equipment, rush into the argon protection, the outlet pressure of the argon protection gas is 1-6KPa, and reduce the oxygen content in the cabin to below 100ppm;

[0044] (3) The Ti6Al4V alloy powder is evenly and continuously pre-laid on the forming substrate, and the parameters of the laser power 250W, scanning speed 1100mm / s, spot size 100μm, scanning distance 80μm, and powder coating thickness 30μm are used to print the internal entity of the test piece forming;

[0045] (4) Use the parameters of laser power 150W, scanning speed 1500mm / s, spot size 100μm, and powder coating thickness 30μm to print the outer contour of the specimen, and the thickness of ...

Embodiment 3

[0048] Specific steps are as follows:

[0049] (1) The Ti6Al4V alloy powder within the particle size range of 15-50 μm is evenly loaded into the laser powder bed additive manufacturing powder feeder, with consistent quality, dryness and no agglomeration;

[0050] (2) Level the substrate of the forming cabin of the powder bed equipment, rush into the argon protection, the outlet pressure of the argon protection gas is 1-6KPa, and reduce the oxygen content in the cabin to below 100ppm;

[0051] (3) The Ti6Al4V alloy powder is evenly and continuously pre-laid on the forming substrate, and the parameters of the laser power 350W, scanning speed 500mm / s, spot size 90μm, scanning distance 60μm, and powder coating thickness 30μm are used to print the internal entity of the test piece forming;

[0052] (4) Use the parameters of laser power 90W, scanning speed 1000mm / s, spot size 90μm, and powder coating thickness 30μm to print the outer contour of the specimen. The thickness of the ou...

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Abstract

According to the laser additive manufacturing method for synergistically improving the surface precision and strength of the titanium alloy, the forming structure is adjustable, the surface is smoothand clean, the surface is self-strengthened, and extra surface treatment and other procedures are not needed. The method comprises the following steps: uniformly and continuously pre-paving Ti6Al4V alloy powder on a forming cabin substrate of laser additive manufacturing equipment, and printing and forming layer by layer to obtain a Ti6Al4V alloy test piece; when each layer is printed and formed,using laser beams to adjacently scan line by line to form an internal solid plane, after forming the internal solid plane, performing laser scanning of a contour along the edge of the internal solid plane to form an external contour, and finish forming of the printing layer; repeating the forming process of the printing layers until laser additive manufacturing forming of the Ti6Al4V alloy test piece is completed, wherein the laser power for printing internal solid plane is not less than the laser power for printing the external contour, and the scanning speed for printing the internal solid plane is not greater than the scanning speed of the printing external contour.

Description

technical field [0001] The invention belongs to the field of laser additive manufacturing, and in particular relates to laser-powder coupling technology, specifically a laser additive manufacturing method for synergistically improving the surface precision and strength of titanium alloys. Background technique [0002] Titanium alloys have high specific strength, specific modulus, and excellent fatigue resistance, corrosion resistance, heat resistance, and biocompatibility. They are currently the most popular structural functional materials and biomedical materials, and are widely used in aerospace. , military, medical, shipbuilding and civilian equipment and other fields. [0003] The existing manufacturing processes of titanium alloys, such as casting, forging, machining and other forming titanium alloys, involve high cost, long cycle time, and difficulty in speeding up. The rate is low, etc., and it is impossible to realize the integration and integrated component manufac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00B33Y70/00
CPCB33Y10/00B33Y70/00B22F10/00B22F10/38B22F10/36B22F10/28B22F10/366B22F10/32Y02P10/25
Inventor 常坤张韧梁恩泉黄文静郑敏魏雷陈静林鑫黄卫东
Owner SHANGHAI AIRCRAFT DESIGN & RES INST COMML AIRCRAFT OF CHINA
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