Additive manufacturing of shaped bodies from curable materials

Patent metadata

Field	Value
Publication number	US-11511478-B2
Application number	US-201716465167-A
Country	US
Kind code	B2
Filing date	Dec 20, 2017
Priority date	Dec 21, 2016
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

A method for producing a shaped body from a curable material, in particular from a mineral binder composition, wherein the curable material is applied layer by layer in an additive method, in particular in an additive free-space method, by a printing head that can be moved in at least one spatial direction and wherein an application rate of the curable material and the temporal development of strength of the curable material are coordinated with each other.

First claim

The invention claimed is:

1. A method for producing a shaped body from a curable material, the method comprising:
applying the curable material in layers by an additive method using a print head that is moveable in at least one spatial direction;
measuring at least one of an application rate of the curable material and a temporal strength development of the curable material; and
adjusting at least one of (i) the application rate of the curable material depending on the measured temporal strength development of the curable material, and (ii) the temporal strength development of the curable material depending on the measured application rate of the curable material,
wherein the temporal strength development of the curable material is a compressive strength of the curable material at a specified point in time at least one of after mixing of the curable material and after the exit of the curable material from the print head.

2. The method as claimed in claim 1 , wherein the application rate of the curable material changes as the number of layers increases.

3. The method as claimed in claim 1 , wherein a waiting time is observed between the application of two successive layers of curable material, and the waiting time is selected depending on the temporal strength development of the curable material.

4. The method as claimed in claim 1 , wherein a movement speed of the print head is set depending on the temporal strength development of the curable material.

5. The method as claimed in claim 1 , wherein the movement speed of the print head is set depending on a length of a distance the print head has to travel in a current layer of the shaped body with release of curable material.

6. The method as claimed in claim 1 , wherein the temporal strength development is determined by measurement of a physical quantity of the curable material at least one time, and the measurement of the physical quantity of the curable material takes place at the at least one specified point in time.

7. The method as claimed in claim 6 , wherein, as a physical quantity, at least one selected from the group consisting of a temperature, an electrical conductivity, a penetration force of a specified object with a predetermined penetration depth, a penetration depth of a specified object with a predetermined penetration force, and a reflection of sound waves is measured on the curable material.

8. The method as claimed in claim 1 , wherein the temporal strength development is measured by at least one of a penetration needle method and a sound measurement.

9. The method as claimed in claim 1 , wherein the curable material is treated with at least one of an agent that accelerates the curing and an agent that retards the curing.

10. The method as claimed in claim 9 , wherein the curable material in the area of the print head is admixed with at least one of a substance that accelerates the curing and a substance that retards the curing.

11. The method as claimed in claim 1 , wherein the curable material comprises a mineral binder composition.

12. The method as claimed in claim 1 , wherein the curable material consists of a mineral binder composition.

13. The method as claimed in claim 1 , wherein the specified point in time is in a range of 0.1 to 1,000 minutes.

14. The method as claimed in claim 1 , wherein the specified point in time is in a range of 0.1 to 100 minutes.

15. The method as claimed in claim 1 , wherein the specified point in time is in a range of 0.1 to 10 minutes.

16. The method as claimed in claim 1 , wherein the application rate of the curable material and the temporal strength development of the curable material are synchronized with each other.

17. The method as claimed in claim 1 , wherein the application rate of the curable material and the temporal strength development of the curable material are measured, and
the application rate of the curable material is adjusted depending on the measured temporal strength development of the curable material, and the temporal strength development of the curable material is adjusted depending on the measured application rate of the curable material.

Assignees

• Sika Tech Ag

Inventors

• Lootens Didier
• Brühwiler Armin
• Bourquin Raphael

Classifications

• B33Y50/02 Primary

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• E04G21/0418

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• B29C64/386

  Data acquisition or data processing for additive manufacturing · CPC title

• E04G21/04

  Devices for both conveying and distributing (concrete pumps F04) · CPC title

• B33Y80/00

  Products made by additive manufacturing · CPC title