Method for additive construction of shaped bodies by stereolithography

A technology of stereolithography and forming bodies, which is applied in the direction of additive processing, 3D object support structure, metal processing equipment, etc., and can solve the problems of time-consuming and transportation time-consuming

Pending Publication Date: 2022-06-21
IVOCLAR VIVADENT AG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, a cleaning process is required every time the build material is changed, which also makes this method time consuming
In addition, the transportation required for changing between different barrels is also time consuming

Method used

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  • Method for additive construction of shaped bodies by stereolithography
  • Method for additive construction of shaped bodies by stereolithography
  • Method for additive construction of shaped bodies by stereolithography

Examples

Experimental program
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Embodiment Construction

[0051] figure 1 A highly simplified schematic perspective view of the essential components of the apparatus for carrying out the method according to the invention is shown. The apparatus comprises a rotatable tub 2, shown for reasons of simplicity as a disk-shaped bottom 3 without the side walls actually surrounding the disk. The barrel bottom 3 is transparent at least in the region in which the exposure unit 6 is exposed to the build-up area. Opposite the exposure unit 6 , a vertically movable build platform 8 is arranged above the barrel bottom 2 . The part 10 being constructed is suspended on the build platform 10 .

[0052] The scraper 4 is suspended above the tub bottom 3 in a position-adjustable manner. The tub 2 is rotatable about a vertically extending axis of rotation extending from the center of the disk of the horizontal tub bottom 3 . A rotary drive (not shown) is provided which rotates the tub 2 under the control of a control unit (not shown) and stops the tub...

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PUM

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Abstract

The invention relates to a method for the layer-by-layer curing of a viscous, photopolymerizable building material by means of stereolithography, in which: a) the building material is dispensed to the bottom of a barrel, b) the barrel is moved relative to a scraper, the scraper is suspended above the bottom of the barrel such that the dispensed building material is moved below the scraper to form a smooth layer, and c) the smooth layer is formed on the bottom of the barrel. The smooth layer has a uniform layer thickness preset by positioning the scraper relative to the bottom of the barrel, c) the smooth layer is brought to a region between the exposure unit and the build platform, d) the build platform is controllably lowered relative to the bottom of the barrel, forming the remaining layer within the gap with a predetermined layer thickness upon displacement of the build material, e) the layer is cured, f) the build platform is raised, according to the invention, the construction material is dispensed to the bottom of the barrel, steps b) to f) are repeated until a molded body is constructed from a plurality of layers that are laminated and cured on one another, and the position of the scraper relative to the bottom of the barrel is adjusted such that the resulting predetermined uniform layer thickness is greater than a predetermined layer thickness set by lowering the construction platform, but does not exceed the predetermined layer thickness by more than 50%.

Description

technical field [0001] The present invention relates to a method for additively building shaped bodies by means of stereolithography by curing adhesive, photopolymerizable building materials layer by layer. Background technique [0002] The build material can be an organic-matrix ceramic slurry, i.e. a flowable, photopolymerizable material filled with ceramic particles, where the viscosity increases with the number of ceramic particles, or can be composed of high viscosity, photocurable composites or photopolymerizable materials composition. When a ceramic slurry is used as a build material, a green body is produced as a shaped body, which is then further processed into a ceramic body by degreasing and sintering. The invention is particularly suitable for the production field of dental restorations. [0003] In order to obtain an aesthetically pleasing result of a dental restoration, it is often desirable to employ various materials of construction and / or various colors in...

Claims

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Application Information

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IPC IPC(8): B29C64/129B29C64/214B29C64/264B33Y10/00B33Y30/00B33Y70/10
CPCB29C64/129B29C64/214B29C64/264B33Y10/00B33Y30/00B33Y70/10
Inventor H·约翰J·艾伯特K·瑞斯特S·鲍姆加特纳M·哈特曼
Owner IVOCLAR VIVADENT AG
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