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Particulate material preheating device and use in 3D methods

A technology of granular materials and heating devices, which is applied in the processing of accessories of main materials, additive processing, and processing of heating elements, etc., which can solve problems such as heavy equipment, deformation of parts, and process errors

Pending Publication Date: 2022-07-08
VOXELJET AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can lead to unwanted temperature gradients in the bed and in the worst case process issues such as part distortion, dimensional deviations or process errors such as lack of bonding
[0017] Furthermore, heating the granular material in the recoater is problematic because the residence time of the granular material is usually very short and only a few layering cycles long
Additionally, unheated particulate material may be discharged due to coating and associated powder discharge in recoaters
[0018] Last but not least, inserting a heating element of sufficient power into a recoater configured to move over the build yard is relatively complex and makes the equipment relatively heavy and relatively expensive

Method used

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  • Particulate material preheating device and use in 3D methods
  • Particulate material preheating device and use in 3D methods
  • Particulate material preheating device and use in 3D methods

Examples

Experimental program
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Effect test

Embodiment 1

[0098] Embodiment 1 phenolic resin technology:

[0099] Adhesive jetting processes using thermosetting adhesives are known from the prior art. Here, the temperature required to cure the binder is either introduced into the bed of particulate material after the build process, for example by microwave treatment or other oven treatments, or the temperature is introduced into the bed of particulate material layer by layer during the build process. This is usually done by IR radiant heating, leaving eg a linear radiator, which in turn is located eg on a recoater next to the build field. Thus, particulate material can be deposited in a new layer while reaching the necessary temperature. A disadvantage here is that the infrared radiation energy is relatively poorly coupled to typical granular materials such as quartz sand or ceramic materials, and much of the energy is lost to the surrounding space.

[0100] This is visible, especially before the actual printing process begins, w...

Embodiment 2

[0104] Example 2: IOB (Inorganic Bonding) Process

[0105] Particulate materials are also used here, such as quartz sand with an average particle size of 90 to 210 μm or more specifically 140 μm. The particulate material can be premixed with so-called accelerators. The material is incorporated into the feed container (preheating container) of a VX1000 3D printer from voxeljet AG via a conveying device, such as a screw conveyor. The preheating vessel can hold approximately 8 kg of particulate material. Several heating rods are placed longitudinally inside the preheating container. The heating rods are arranged such that the particulate material must flow around the heating rods. The heating rod had a connected load of 6 kW and heated the particulate material from an ambient temperature of about 22°C to a temperature in excess of 80°C. The hot granular material is batch-filled into the recoater hopper. This process happens approximately every 3 layers. The recoater hoppe...

Embodiment 3

[0108] Example 3: High-speed sintering process

[0109] Another process for additive manufacturing is high-speed sintering. In this process, a polymer powder, such as polyamide 12 with an average particle size of 55 μm - PA12 for short, is processed. In contrast to the adhesive jet example above, here the materials are bonded by selective melting. To do this, particulate material is applied to the build surface. In this case, the layer thickness is typically 80 μm. The new layer now reaches a temperature of preferably 165-178° C. by radiation from the free upper side and by thermal conduction from the previously applied lower layer. The printhead then selectively incorporates the absorber onto the area to be cured before another radiation source passes through the entire build field. The surface of the layer of particulate material wetted by the absorbent is thus heated above the melting point of the particulate material and sintered. The unprinted portion of the build ...

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Abstract

The invention relates to a device and a method for producing 3D molded parts, wherein a preheating container is used.

Description

Background technique [0001] The present invention relates to a preheated vessel and an apparatus and method for producing 3D moldings using the preheated vessel. [0002] European patent EP 0 431 924 B1 describes a process for producing three-dimensional objects based on computer data. In this process, a thin layer of particulate material is deposited on the platform by a recoater, and a binder material is selectively printed on the thin layer of particulate material by a print head. The particle areas on which the binder is printed are bonded and cured under the influence of the binder and optional additional hardener. Next, the build platform is lowered by one layer or the recoater / printhead unit is raised and a new layer of particulate material is applied, while also selectively printing this new layer of particulate material as described above. Repeat these steps until the desired height of the object is obtained. Thus, the printed and cured area forms a three-dimension...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C64/255B29C64/295B33Y30/00B33Y40/10
CPCB29C64/255B33Y30/00B29C64/295B33Y40/10Y02P10/25B33Y10/00B29C64/214B29C64/314B29C64/321B29C64/159B29C64/209
Inventor 克里斯托夫·霍普曼罗曼·谢勒因戈·埃德雷尔
Owner VOXELJET AG
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