High-temperature-resistant 3D printing sprayer device

Abstract

The invention discloses a high-temperature-resistant 3D printing sprayer device. The device comprises a base provided with a mounting hole; a feeding module, a heat dissipation module, a heating module and a nozzle are arranged on the base in sequence from top to bottom; the feeding module comprises a stepping motor and an extruder; a feeding inlet is formed in the upper end of the extruder; the lower end of the extruder is provided with a guide pipe; the guide pipe passes through the heating module and then is connected with the nozzle; a heat insulation module is arranged between the feeding module and the heat dissipation module and comprises X-direction sliding blocks and Y-direction sliding blocks, the two sets of sliding blocks are crossed and overlapped vertically, and each set of sliding blocks comprises two parallel sliding block units; the lower portion of the heat insulation module is further provided with a heat insulation connection block; and a transfer module is arranged between the heat insulation module and the heating module and comprises a throat tube and a connection base, the throat tube is arranged between the guide pipe and the nozzle, and the throat tube and the nozzle are tightly matched. The nozzle component is of a staged-type detachable design, and maintenance is convenient, easy and rapid.

Description

technical field [0001] The invention belongs to the field of 3D printers, in particular to a high temperature resistant 3D printing nozzle device. Background technique [0002] 3D printer, also known as three-dimensional printer, is a kind of accumulative manufacturing technology, that is, a machine of rapid prototyping technology. It is based on a digital model file and uses metal or plastic materials to bond materials. Bonding materials to create three-dimensional objects. A typical FDM printer is mainly composed of a heat dissipation block, a throat, a heating block, and a nozzle. The print head uses friction as power to push the unmelted material at the rear forward, thereby extruding the melted material at the front from the nozzle. Since the inner diameter of the throat is larger than the diameter of the filament, if the heat dissipation of the throat is not timely during printing, the melted material in the front section will not only be extruded from the nozzle, but...

AI Technical Summary

Problems solved by technology

Since the inner diameter of the throat is larger than the diameter of the filament, if the heat dissipation of the throat is not timely during printing, the melted material in the front section will not only be extruded from the nozzle, but will also form a backflow in the gap between the throat and the filament, so that the filament and the throat The friction between them increases, and even causes the material to overflow from the back end of the throat, resulting in no silk

[0003] Since the filament is extruded from the nozzle, it relies on the forward thrust of the unmelted material at the rear. As the printing time increases, if the temperature at the rear end of the throat reaches the glass transition temperature of the material, the filament will soften and the forward thrust will become smaller. , the amount of spinning will decrease, and the extrusion width of the wire will narrow, which will reduce the accuracy of the parts

Especially for high-performance polymers such as PEEK and polyimide, on the one hand, the viscosity of the material is high, and the tolerable gap backflow distance itself is shorter than that of ABS and PLA. In addition, the material has a high melting point, and the nozzle printing temperature is generally above 350°C. Traditional It is difficult to reduce the temperature at the rear end of the throat to below the glass transition temperature of the material due to the heat dissipation of the cooling block, so the phenomenon of "plugging" often occurs

For high-melting point and high-viscosity materials such as PEEK and polyimide, the existing print head structure cannot meet the heat dissipation requirements of the throat, and cannot achieve long-term continuous fine printing of such materials

Images