Printing device based on double material wire extruding mechanisms

Abstract

The invention provides a printing device based on double material wire extruding mechanisms. The printing device comprises a wire feeding mechanism, a moving mechanism, a locking mechanism, a supporting mechanism, a building material wire extruding head and a support material wire extruding head, wherein the building material wire extruding head and the support material wire extruding head are arranged on the supporting mechanism; the support material wire extruding head is provided with a working position and an idle position higher than the working position; and the moving mechanism is used for enabling the support material wire extruding head to switch between the working position and the idle position and the support material wire extruding head is fixed at the working position or the idle position through the locking mechanism. When the building material wire extruding head works, the support material wire extruding head is moved to the idle position through the moving mechanism, and locked by the locking mechanism and the support material wire extruding head is higher than the building material wire extruding head, so that the support material wire extruding head is prevented from interfering and influencing printing of a forming surface.

Description

technical field [0001] The invention belongs to the technical field of fused deposition modeling, and in particular relates to a printing device based on a double-filament extrusion mechanism. Background technique [0002] 3D printing technology belongs to rapid prototyping technology. Its basic principle is lamination manufacturing. The fast printer forms the cross-sectional shape of the workpiece by scanning in the X-Y plane, and the displacement of the thickness of the layer is performed intermittently in the Z coordinate, and finally forms a three-dimensional part. . Fused deposition modeling (FDM) technology is a kind of 3D printing technology, which heats and melts filamentous hot-melt materials, and at the same time, under the control of the computer, the three-dimensional nozzle selectively coats the material on the surface according to the cross-sectional profile information. On the workbench, a layer of cross-section is formed after rapid cooling. After one layer...

AI Technical Summary

Problems solved by technology

[0003] It usually includes two extrusion heads, one for rapid prototyping of the printed object entity, and the other for rapid prototyping of the support mechanism of the printed object. However, the construction material extrusion head and support material extrusion head of the current 3D printing equipment Usually at the same height, after the support material forms a support structure, when the construction material extrusion head is working, the support material extrusion head and the construction material extrusion head move together, which will affect the surface molding quality of the object, cause interference, and affect the molding quality of the object

[0004] At the same time, the current 3D printer extrusion head based on the FDM principle often encounters the following problems in use: ①The extrusion head can only extrude one material, and when the supporting structure and the building object are made of the same material, the surface of the object is easily damaged Structure ②The extrusion head has only one temperature control device, and the temperature in the melting zone and the outlet flow forming temperature cannot be balanced; ③The temperature at the cooling end of the extrusion head is high, and the energy consumption is high

The filament softens prematurely in the heat dissipation end, resulting in unstable filament output from the nozzle, difficulty in extrusion, and even wire feeding failure; ④The temperature measurement is not accurate enough to accurately measure the temperature required for the filament to melt in the melting channel; ⑤Extrusion The efficiency is low, and basically only materials with similar thermal properties can be printed. For high melting point materials and complex working conditions, it is difficult to self-adapt; The upper limit of the working temperature of the extrusion head affects the uniformity of the temperature field distribution in the molding chamber

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