A kind of additive manufacturing method

An additive manufacturing and powder material technology, applied in the field of additive manufacturing, can solve the problems of reducing the efficiency of equipment processing and sintering, affecting the subsequent sintering of workpieces, and sintering on the substrate, so as to improve the reusability and the mechanical properties and dimensions of the parts. Accuracy, reduce processing cost, improve the effect of warpage

Active Publication Date: 2021-11-05
HUNAN FARSOON HIGH TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the particularity of rapid prototyping, large stress will be generated during sintering, which may easily cause deformation and warping, and the workpiece needs to be sintered on the substrate; therefore, before each molding construction, the construction platform needs to be leveled to ensure that all The uniformity and thickness of the first layer of metal powder paved so that the metal powder can completely penetrate the first layer of metal powder to the construction platform after scanning and sintering. If the uniformity of the first layer of metal powder cannot be guaranteed, some powders cannot It is completely melted on the substrate, so it cannot support and fix the formed workpiece very well, thus affecting the subsequent sintering of the workpiece
[0003] In the existing rapid prototyping technology, one way of leveling the substrate is to adjust it manually, that is, to use a micrometer to measure the distance from multiple points on the substrate to the powder-coating board to realize the adjustment of the substrate. The substrate in the prior art The leveling process is complex and cumbersome, and the leveling accuracy is not high, which reduces the processing and sintering efficiency of the equipment; another way of leveling the substrate is to complete the leveling of the substrate through the joint efforts of the sensing unit, signal processing module, and lifting adjustment mechanism. Although the manpower is liberated to a certain extent and the adjustment accuracy is improved, the structure of the equipment becomes more complicated and the cost increases

Method used

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  • A kind of additive manufacturing method
  • A kind of additive manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Nylon copolymer powder with a particle size of less than 500 μm and improved melt fluidity ( CM8000, the melting point of the material is 137°C), the material is spread on a stainless steel substrate with a conical hole (diameter 3mm, depth 2mm) on the upper surface, the thickness of the powder layer is 10mm, and then filled with nitrogen to reduce the oxygen content in the equipment cavity to 0.3%. Heat the substrate to 170°C to completely melt the above powder into a melt, stop heating after the melt is leveled, and cool until it is completely solidified into a solid. The powder feeding cylinder is filled with PEEK powder with a particle size range of 30-120 μm, and the equipment cavity is filled with nitrogen to reduce the oxygen content to below 0.3%. After loading the stl file, a support is generated to connect the substrate and the workpiece to be sintered. Sintering equipment The cavity does not need to be heated, so that the polymer powder material with high me...

Embodiment 2

[0030] Nylon copolymer powder with particle size less than 50 μm and improved melt fluidity ( CM8000, the melting point of the material is 137°C), the material is spread on a stainless steel substrate with a conical hole (diameter 3mm, depth 2mm) on the upper surface, the thickness of the powder layer is 10mm, and then filled with nitrogen to reduce the oxygen content in the equipment cavity to 0.3%. Heat the substrate to 170°C to completely melt the above powder into a melt, stop heating after the melt is leveled, and cool until it is completely solidified into a solid. The powder feeding cylinder is filled with PA46 powder with a particle size range of 30-120 μm, and the equipment cavity is filled with nitrogen to reduce the oxygen content to below 0.3%. After loading the stl file, a support is generated to connect the substrate and the workpiece to be sintered. Sintering equipment The cavity does not need to be heated, and the high melting point polymer powder material can...

Embodiment 3

[0034] Nylon copolymer powder with a particle size of less than 500 μm and improved melt fluidity ( CM8000, the melting point of the material is 137°C), the material is spread on a stainless steel substrate with a conical hole (diameter 3mm, depth 2mm) on the upper surface, the thickness of the powder layer is 10mm, and then filled with nitrogen to reduce the oxygen content in the equipment cavity to 0.3%. Heat the substrate to 170°C to completely melt the above powder into a melt, stop heating after the melt is leveled, and cool until it is completely solidified into a solid. The powder feeding cylinder is loaded with PPS powder with a particle size range of 30-120 μm, and the equipment cavity is filled with nitrogen to reduce the oxygen content to below 0.3%. After loading the stl file, a support is generated to connect the substrate and the workpiece to be sintered. Sintering equipment The cavity does not need to be heated to realize the polymer powder material with high me...

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Abstract

The invention provides an additive manufacturing method, comprising the following steps: using a detachable substrate with holes on the surface, and laying a layer of polymer powder material with excellent melt fluidity on the substrate; Pass inert gas to reduce the oxygen content in the equipment cavity to less than 0.5%, heat the polymer powder material until it is completely melted into a melt, stop heating after the melt is naturally leveled on the surface of the substrate, and the melt is cooled and solidified into a solid Finally, a layer of substrate leveling layer is formed to complete the calibration and leveling of the substrate; the stl file is loaded, and the workpiece is removed after sintering to remove the substrate leveling layer. In the present invention, a layer of leveling layer is formed on the substrate with holes on the surface by using a material with excellent melt fluidity, which does not require complicated substrate calibration and leveling processes, and at the same time, the holes on the substrate enhance the relationship between the substrate and the leveling layer Adhesion.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to an additive manufacturing method. Background technique [0002] Due to the particularity of rapid prototyping, large stress will be generated during sintering, which may easily cause deformation and warping, and the workpiece needs to be sintered on the substrate; therefore, before each molding construction, the construction platform needs to be leveled to ensure that all The uniformity and thickness of the first layer of metal powder paved so that the metal powder can completely penetrate the first layer of metal powder to the construction platform after scanning and sintering. If the uniformity of the first layer of metal powder cannot be guaranteed, some powders cannot It is completely melted on the substrate, so it cannot support and fix the shaped workpiece very well, thus affecting the subsequent sintering of the workpiece. [0003] In the existing rapid pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C64/153B29C64/371B33Y10/00B33Y40/00
Inventor 苏婷谭锐袁博李俭徐文雅
Owner HUNAN FARSOON HIGH TECH CO LTD
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