Method and device for 3D printing using temperature-controlled processing

Patent metadata

Field	Value
Publication number	US-11097471-B2
Application number	US-201515128640-A
Country	US
Kind code	B2
Filing date	Mar 27, 2015
Priority date	Mar 31, 2014
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

The invention relates to a method for producing 3D components, particulate material being applied in layers to a building platform in a closed build space and printing fluid being selectively applied, and these steps being repeated until a three-dimensional component is obtained, the relative humidity or the relative solvent concentration in the atmosphere in the build space being set to a selected value, and/or the temperature in the build space being set to a selected temperature.

First claim

What is claimed is:

1. A method for producing 3D components comprising the steps of:
applying a particulate material in layers to a building platform in a closed build space and
selectively applying a printing fluid,
wherein the applying and selectively applying steps are repeated until the three-dimensional component is obtained, wherein the method includes flowing an air through the closed build space and the air in the closed build space is regulated to a temperature of 15° C. to 40° C. and relative humidity of 50% to 90%;
wherein
the particulate material includes water-insoluble particles;
air currents in an interior of the build space are controlled with a pipe, a diffusor, or a baffle plate;
the method includes measuring a moisture level of the closed build space; and
the method includes drying a water glass binder from a dissolved state to form water glass bridges that bind together the particulate material to form the three-dimensional component.

2. The method according to claim 1 , wherein the printing fluid comprises an aqueous binder, and one or more climatic conditions in the build space is set in such a way that an evaporation rate of the water is controllable in the 3D component to be produced.

3. The method of claim 2 , wherein the evaporation rate of the water is reduced with respect to the conditions at room temperature (21° C.) and at a humidity outside the closed build space.

4. The method of claim 1 , wherein the temperature is set to a value from 18° C. to 40° C.

5. The method of claim 4 , wherein the temperature is set to a value from 30° C. to 35° C.

6. The method of claim 1 , wherein the particulate material is selected from the group consisting of sand, metal, polymers, ceramic, wood, cellulose, lactose, salts, carbon, glasses, cement and gypsum.

7. The method of claim 1 , wherein the particulate material includes a water-soluble binder as a powdered binding agent and water-insoluble particles.

8. The method of claim 1 , wherein the air currents have a predetermined temperature and a predetermined relative humidity.

9. The method of claim 8 , wherein
the particulate material is selected from the group consisting of sand, metal, polymers, ceramic, wood, cellulose, lactose, salts, carbon, hard materials, glasses, cement and gypsum; and
the printing fluid comprises aqueous binder selected from the group consisting of water, alcohols, esters, ethers, acetates, ketones, amides, aldehydes, benzene, acrylates, styrene, epoxies, polyols, isocyanates, novolaks, resols, polyesters, peroxides, succinates, aromatics, aliphatics and hydrocarbons.

10. The method of claim 8 , wherein the 3-D components are built in a device having an insulation.

11. The method of claim 1 , wherein the build space is tightly sealed so that the relative humidity and the temperature are more constant and more easily regulated.

12. The method of claim 1 , wherein the printing fluid comprises an aqueous binder that includes a water-soluble binder, wherein the water-soluble binder is a powdered binding agent dissolved in water.

13. The method of claim 12 , wherein the particulate material includes a metal, a polymer, a ceramic, a wood, a cellulose, a lactose, a tungsten carbide, a glass, a cement, or a gypsum.

14. The method of claim 1 , wherein a temperature of an interior of the build space is controlled by an air heating unit or an IR emitting unit.

15. The method of claim 1 , wherein the method includes adding moisture using a humidification system having a moisture source.

16. The method of claim 1 , wherein
the particulate material is selected from the group consisting of sand, metal, polymers, ceramic, wood, cellulose, lactose, salts, carbon, glasses, cement and gypsum; and
the particulate material includes the water glass.

17. A method for producing one or more 3D components comprising the steps of:
applying a layer of particulate material, including water-insoluble particles, to a building platform in a closed build space; and
selectively applying an aqueous binder comprising a water glass binder,
wherein the applying and selectively applying steps are repeated until a three-dimensional component is obtained;
wherein the method includes drying the water glass binder from a dissolved state to form water glass bridges,
the water-insoluble particles are bound together by the water glass bridges to form the three-dimensional component, and
an air in the closed build space is temperature and humidity regulated;
wherein an air in the closed build space is regulated to a temperature of 15° C. to 40° C. and relative humidity of 50% to 90%;

wherein the method includes adding moisture into the closed build space by blowing air from an air conditioning unit into the closed build space using diffusers.

Assignees

• Voxeljet Ag

Inventors

• Günther Daniel
• Günther Johannes
• Gnüchtel Ingo
• Russo Massimo

Classifications

• B29C64/393

  for controlling or regulating additive manufacturing processes · CPC title

• B33Y40/00

  Auxiliary operations or equipment, e.g. for material handling · CPC title

• B29C35/045

  using gas or flames · CPC title

• B33Y30/00

  Apparatus for additive manufacturing; Details thereof or accessories therefor · CPC title

• B32B27/306

  comprising vinyl acetate or vinyl alcohol (co)polymers · CPC title