A cooled extruder, fixable to a printing carriage of a machine for quick prototyping with thread of filler material
A technology of filling materials and prototyping, applied in the field of rapid prototyping machines, which can solve problems such as compact collection problems, extruder cooling problems, etc.
Pending Publication Date: 2022-02-01
ROBOZE SPA
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0005] A known problem with 3D printers is that the maximum operating temperature of the extruder can lead to the following disadvantages when using materials with relatively low melting points: namely, cooling problems of the extruder and problems with the collection of compacts
Method used
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Embodiment Construction
[0021] With reference to the above-mentioned figures, the extruder which is the subject of the invention has a body which can be integrally fitted to the printing carriage, which body is basically formed by a plurality of parts rigidly fitted to each other.
[0022] According to the invention, extrusion is ensured by a combination of the following devices:
[0023] - heating means for controlled and localized heating,
[0024] - blowing means for blowing at low temperature and at a predetermined flow rate determined based on experimental tests,
[0025] - channels (or conduits) for supplying filaments of molten material, conveniently configured to enhance flowability.
[0026] The various components that help form the body of the extruder are discussed in detail below.
[0027] · Nozzle 1 : An essentially cylindrical element in which the material is melted and delivered to the printing surface. The nozzle 1 is preferably integral with the heating block 6 by threads.
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Abstract
The present invention relates to an extrusion system comprising a cooled extruder, fixable to a pressing carriage of a machine for quick prototyping with thread of filler material, which comprises, in combination: - means for the controlled and localized heating of the thread of filler material (13), - means for blowing compressed air onto a zone of the extruder to be cooled, placed immediately upstream of the melting zone, with a predetermined flow rate capable of being determined on the basis of experimental tests, - a channel, or conduit, for supplying the thread of filler material (13), conveniently configured to improve the flowability of the thread of filler material therein; wherein said extruder includes a nozzle (1), the body of which is provided with a melting zone in which the melting of the filler material (13) takes place, and with an outlet end for conveying the material on a pressing plane; said nozzle (1) being integral with a heating block (6); wherein said nozzle (1) is made of a material having high wear resistance, corrosion resistance and good workability; and wherein at least at the melting zone of said nozzle (1), the conduit in which the thread of filler material (13) slides, is internally processed with a surface finishing having a roughness from 0.2 to 2.5 [mu]m or less, which ensures a good flowability of the material, reducing or avoiding surface adhesion and risks of vulcanization of the material.
Description
technical field [0001] The present invention relates to the field of machines for rapid prototyping (commonly referred to as "3D printers"). [0002] More specifically, the present invention relates to a cooling extruder particularly suitable for 3D printing using materials with a high melting point. Background technique [0003] An extruder used in an additive production system is a machine element designed to change the state of a filament from a solid state to a viscoelastic state, allowing the material to be deposited in layers. [0004] During the extrusion process, the material is transported by the drive system into the extruder, the temperature reached in the extruder changes the state of the material, and the material is deposited layer by layer on the printing surface. [0005] A known problem with 3D printers is that the maximum operating temperature of the extruder can lead to disadvantages when using materials with relatively low melting points: namely, cooling...
Claims
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IPC IPC(8): B29C48/05B29C48/25B29C48/285B29C48/30B29C48/86B29C48/87B29C64/118B29C64/209B29C64/295B33Y30/00
CPCB29C48/05B29C48/266B29C48/2886B29C48/30B29C48/3001B29C48/3003B29C48/865B29C48/87B29C48/873B29C64/118B29C64/209B29C64/295B33Y30/00B29K2071/00
Inventor 阿莱西奥·洛鲁索
Owner ROBOZE SPA