Methods and systems for determining viscosity of photo-curing resin for vat photopolymerization printer
US-11169067-B2 · Nov 9, 2021 · US
Resin viscosity detection in additive manufacturing
US11235533B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11235533-B2 |
| Application number | US-202016845416-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 10, 2020 |
| Priority date | Apr 26, 2019 |
| Publication date | Feb 1, 2022 |
| Grant date | Feb 1, 2022 |
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Abstract
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A method of measuring the viscosity of a resin in a bottom-up additive manufacturing apparatus, includes the steps of: (a) providing an additive manufacturing apparatus including a build platform and a light transmissive window, said build platform and said window defining a build region there between, with said window carrying a resin; (b) advancing said build platform and said window towards one another until said build platform contacts said resin; (c) detecting the force exerted on said build platform by said resin; and (d) generating in a processor a viscosity measure of said resin from said detected force.
First claim
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We claim: 1. A method comprising the steps of: (a) providing a bottom-up additive manufacturing apparatus including a build platform and a light transmissive window, said build platform and said window defining a build region there between, with said window carrying a resin; (b) advancing said build platform and said window towards one another until a surface of said build platform facing said window contacts said resin; (c) detecting the force exerted on said build platform by said resin using a force sensor arranged against a side of said build platform opposing said surface; and (d) generating in a processor a viscosity measure of said resin using said detected force and position time series data of said platform. 2. The method of claim 1 , wherein said generating is carried out with an empirical model. 3. The method of claim 1 , wherein said generating is carried out with a regression model. 4. The method of claim 1 , wherein said generating is carried out with a machine learned model. 5. The method of claim 1 , wherein said apparatus further includes a force sensor operatively associated with said light transmissive window, and said detecting step includes detecting force exerted on said force sensor operatively associated with said window. 6. The method of claim 1 , wherein said force sensor comprises a strain gauge. 7. The method of claim 1 , wherein said window is stationary in the lateral (X, Y) dimensions. 8. The method of claim 1 , wherein said window is permeable to oxygen. 9. The method of claim 1 , further comprising: (a) recording said viscosity measure in association with a resin batch identity; and (b) producing an object on said build platform of said additive manufacturing apparatus, wherein said producing is modified based on said viscosity measure.
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Classifications
using layers of liquid which are selectively solidified · CPC title
Platforms or substrates (support structures intended to be sacrificed after manufacture B29C64/40) · CPC title
- B29C64/393Primary
for controlling or regulating additive manufacturing processes · CPC title
Processes of additive manufacturing · CPC title
for motion along the axis orthogonal to the plane of a layer · CPC title
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- What does patent US11235533B2 cover?
- A method of measuring the viscosity of a resin in a bottom-up additive manufacturing apparatus, includes the steps of: (a) providing an additive manufacturing apparatus including a build platform and a light transmissive window, said build platform and said window defining a build region there between, with said window carrying a resin; (b) advancing said build platform and said window towards …
- Who is the assignee on this patent?
- Carbon Inc
- What technology area does this patent fall under?
- Primary CPC classification B29C64/393. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Feb 01 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).