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3D printing method for selective laser curing metal

A 3D printing and laser selection technology, applied in the direction of process efficiency improvement, additive manufacturing, additive processing, etc., can solve the problems of low forming precision and low printing efficiency, achieve high forming precision, fast forming speed, and ensure high precision Effect

Active Publication Date: 2020-02-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a 3D printing method for laser selective solidification of metal, which solves the problems of low forming precision and low printing efficiency after printing and extrusion of metal paste

Method used

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  • 3D printing method for selective laser curing metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0032] The steps of preparing iron-based alloy parts are as follows:

[0033] (1) Equipped with a photosensitive solvent: acryloylmorpholine (ACMO, with a purity of 98%) and 2,4,6-trimethylbenzoyl-diphenyl (Omnirad TPO) were prepared according to a mass ratio of 95:5 For comparison, add the two together and stir evenly with a glass rod to fully dissolve TPO into ACMO, prepare it as a photosensitive solvent and pour it into an aluminum bottle for later use;

[0034] (2) Preparation of photosensitive slurry: measure 7ml of photosensitive solvent, place it under a digital display electric stirrer to stir and mix at a speed of 800rpm / min, weigh 100g of iron-based alloy 10V powder (D 50 = 30 μm), gradually add the powder into the photosensitive solvent, and after the powder is completely added, increase the rotating speed to 1600rpm / min and stir for 30 minutes to obtain a uniform photosensitive slurry without aggregates, and the solid phase volume fraction is 65.5%. Adding 3wt.% o...

Embodiment example 2

[0040] The steps of preparing titanium alloy parts are as follows:

[0041] (1) Pour 15g of acryloylmorpholine (ACMO, with a purity of 98%) into a beaker, then weigh 0.75g of 2,4,6-trimethylbenzoyl-diphenyl (Omnirad TPO) and pour Pour into a beaker and stir until fully dissolved for later use;

[0042] (2) Weigh a certain amount of titanium alloy TC4 powder (particle size 50 μm), add the prepared photosensitive solvent to make its solid content 63vol.%, and add 0.5wt.% stearic acid to improve fluidity, pour Mixing is carried out in the mixing tank of the vacuum planetary ball mill, the ball-to-material ratio is 1:1, the ball milling speed is 100rpm / min, the ball milling time is 30min, and the slurry after ball milling is taken out for use;

[0043] (3) Design the three-dimensional structure of the printed part, slice it in the computer slicing software, and import the sliced ​​data into the attached figure 1 In the 3D printing control device (1) shown in;

[0044] (4) Injec...

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Abstract

The invention provides a 3D printing method for selective laser curing metal, and belongs to the technical field of 3D printing forming. The 3D printing method comprises the following steps that firstly, metal powder is mixed with liquid photosensitive resin, then a dispersing agent is added in the slurry to adjust the rheological property of the slurry, and photosensitive paste with proper solid-phase volume fraction and good rheological property is prepared. A 3D printing device is used for extruding the slurry out of a nozzle with a certain diameter; meanwhile, in the process of extruding and dispersing accumulation of a slurry flow line, a fine laser beam selection area is adopted to synchronously scan to the plane of the slurry flow line, so that the slurry flow line is locally and rapidly solidified and formed, and forming of a metal part with a certain shape can be achieved. According to the 3D printing method for selective laser curing metal, the high-precision metal part can be directly formed, the forming speed is high, the part strength is high, the density is uniform, the cost is low, and no special requirements are required for the working environment.

Description

technical field [0001] The invention belongs to the field of 3D printing forming technology, and provides a 3D printing method for laser selective solidification of metal. Background technique [0002] 3D printing technology is a technology that produces three-dimensional entities directly from digital models through material accumulation, and is considered to have great potential in the direct forming of metal parts of arbitrary complex shapes. At present, the mainstream 3D printing technology uses high-energy beams such as laser beams and electron beams to heat and melt pre-laid metal powders, and build up three-dimensional parts layer by layer. Metal and alloy parts such as titanium and titanium alloys, superalloys, and magnesium-aluminum alloys have been realized. direct manufacturing. However, the printing powder must meet the requirements of high sphericity, good fluidity, high bulk density, fine particle size and narrow particle size distribution. However, many mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F3/105B22F3/10C22C14/00B33Y10/00B33Y50/02
CPCB22F3/227B22F3/1021B22F3/1007C22C14/00B33Y10/00B33Y50/02B22F10/00B22F12/41B22F10/36B22F10/12B22F10/68Y02P10/25
Inventor 杨芳汪豪杰郭志猛秦乾陈存广路新邵艳茹孙海霞
Owner UNIV OF SCI & TECH BEIJING
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