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Method for Simultaneous Printing of Sand Support Assisted Additive Manufacturing of Metal Parts

A technology for metal parts and additive manufacturing, which is applied in the directions of additive manufacturing, additive processing, and process efficiency improvement. The effect of increasing complexity

Active Publication Date: 2022-07-12
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above studies are only aimed at the first 3D printing sand mold forming and then sand casting, but they have not really improved the complex parts of laser melting deposition (powder feeding printing) and arc additive manufacturing technology (wire feeding printing) in terms of additive manufacturing. molding ability, so this problem needs to be solved urgently

Method used

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  • Method for Simultaneous Printing of Sand Support Assisted Additive Manufacturing of Metal Parts
  • Method for Simultaneous Printing of Sand Support Assisted Additive Manufacturing of Metal Parts
  • Method for Simultaneous Printing of Sand Support Assisted Additive Manufacturing of Metal Parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Mix silica and 1.8%-2wt% clay binder in proportion to form molding sand powder.

[0044] (2) When printing the first layer (first layer), on the substrate, powder feeding and printing the 301 stainless steel metal parts and metal supports of the same height, and then use the injector to lay the molding sand powder to the same height as the printing surface, and then use The scraper compacts and solidifies the molding sand powder and scrapes it flat, and uses the brush to clean the residual molding sand powder on the surface of the metal parts. The single-layer printing height is 0.7mm, the laser power is 900W, the scanning speed is 500mm / min, and the scanning spacing is 1.7mm.

[0045] (3) Repeat the printing, print the second layer, the third layer...the nth layer, until the complete 301 stainless steel metal parts and metal supports are printed, and the complete silica sand mold parts are formed.

[0046] (4) Use alcohol to dissolve the silica sand mold.

[0047...

Embodiment 2

[0051] (1), mixing alumina and 1.8%-2wt% clay binder in proportion to form molding sand powder.

[0052] (2) When printing the first layer (first layer), on the substrate, first feed the powder to print the TC4 titanium alloy metal parts and metal support structures of the same height, and then use the injector to lay the molding sand powder to the same height as the printing surface. , and then use a scraper to compact and solidify the molding sand powder and scrape it flat, and use a brush to clean the residual molding sand powder on the surface of the metal parts. The single-layer printing height is 0.7mm, the laser power is 1000W, the scanning speed is 560mm / min, and the scanning point distance is 1.7mm.

[0053] (3) Repeat the printing, print the second layer, the third layer...the nth layer, until the complete TC4 titanium alloy metal parts and metal supports are printed, and the complete alumina sand mold parts are formed.

[0054] (4) Use alcohol to dissolve alumina s...

Embodiment 3

[0059] (1), mixing silicon nitride and 1.8%-2wt% sodium silicate binder in proportion to form molding sand powder.

[0060] (2) When printing the first layer (the first layer), on the substrate, first feed the powder to print the CuSn10 copper alloy metal parts and metal support structures of the same height, and then use the injector to lay the molding sand powder to the same height as the printing surface. , and then use a scraper to compact and solidify the molding sand powder and scrape it flat, and use a brush to clean the residual molding sand powder on the surface of the metal parts. The single-layer printing height is 0.6mm, the laser power is 1100W, the scanning speed is 600mm / min, and the scanning point distance is 1.7mm.

[0061] (3) Repeat the printing, print the second layer, the third layer...the nth layer, until the complete CuSn10 copper alloy metal parts and metal supports are printed, and the complete silicon nitride sand mold parts are formed.

[0062] (4) ...

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Abstract

The invention belongs to the technical field of additive manufacturing, and provides a method for synchronously printing a sand mold supporting auxiliary additive manufacturing metal parts. Parts and metal supports, and form sand molds with the same height as the metal parts layer by layer, until complete metal parts and metal supports are printed, and complete sand mold parts are formed. The formed sand mold parts and the metal spaced between the sand mold parts The support constitutes a support structure, and the support structure fits with the inner wall of the metal part. The invention prevents the melt pool from collapsing due to lack of structural support in the powder feeding / wire feeding printing stage, thereby causing printing failure. At the same time, the invention avoids redundant machining, reduces the molding cost of metal parts with complex structures, and satisfies the market demand. need.

Description

technical field [0001] The invention relates to the field of additive manufacturing, and specifically proposes a method for printing complex metal parts by feeding materials in additive manufacturing. Background technique [0002] 3D printing is now used in the field of casting. Commonly used technologies are: Fused Deposition Rapid Prototyping (FDM), Light Curing (SLA), Selective Laser Sintering (SLS), and Moldless Mold Manufacturing (PCM) , 3D printing-based direct shell casting technology (DSPC), 3D inkjet printing technology (3DP). Moreover, the application of 3D printing technology in the field of metal casting currently mainly focuses on investment casting, sand casting, and repairing defects. [0003] Sand casting has high requirements on design accuracy and surface quality. 3D printing combined with sand casting can produce products with much higher precision than traditional casting methods. Here, compared with mechanical processing, 3D printing has complicated mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B33Y10/00
CPCB33Y10/00B22F10/00B22F10/36B22F10/66B22F10/25B22F10/366B22F10/47Y02P10/25
Inventor 孙中刚嵇书伟陈小龙常辉
Owner NANJING TECH UNIV