A pneumatic additive manufacturing nozzle

Abstract

The invention discloses an air pressure type additive manufacturing spray head. The air pressure type additive manufacturing spray head comprises a nozzle and multiple stages of storage barrels sequentially connected to the input end of the nozzle. A nozzle heating unit and a nozzle heat insulation layer are sequentially arranged on the outer portion of the nozzle. A nozzle gasket is arranged between the nozzle and the connected barrels. Each stage of barrel is sleeved with an independent barrel temperature control unit. Heating cavities in all the stages of barrel temperature control units are sequentially connected together in series in the axial direction. A barrel heat insulation layer is arranged on the outer portion of each barrel temperature control unit. A material heat conduction unit is arranged in each stage of barrel. Each material heat conduction unit comprises a plurality of heat conduction plates evenly arranged in the corresponding barrel. Barrel gaskets are arranged between the adjacent barrels. The feeding end of the last stage of barrel far away from the nozzle is sequentially provided with the corresponding barrel gasket, a barrel upper cover and a barrel upper cover heat insulation layer. Each barrel upper cover is provided with a feeding and extrusion force stabilization device connector and an extrusion force control connector. The barrel upper cover heat insulation layers, the barrel heat insulation layers of all the stages of barrels and the primary nozzle heat insulation layer are connected into a whole in a sealed manner.

Description

technical field [0001] The invention belongs to the field of additive manufacturing (3D printing) material processing, relates to fusion deposition forming technology, and specifically relates to a pneumatic additive manufacturing nozzle. Background technique [0002] Fused deposition modeling (FDM) is a relatively mature technology in the field of rapid prototyping. Its basic forming principle is to transform complex three-dimensional processing into simple two-dimensional plane processing, that is, by three-dimensional modeling software or three-dimensional scanner, etc. The 3D model of the part obtained by the tool is input to the pre-processing software to obtain the program to control the forming of the part. Under the control of the numerical control system, the molten material is extruded through the nozzle as required, from points and lines, to surfaces, and finally into a body. Reverse to obtain the desired shaped parts. [0003] Pneumatic fused deposition forming ...

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Problems solved by technology

[0003] Pneumatic fused deposition forming equipment, due to its advantages of simple equipment structure, unrestricted shape of consumables, and light nozzle, has received extensive attention in scientific research and practical applications. There are defects in the heating method, air pressure stability, etc., which limit its application to a certain extent.

[0004] There are mainly the following defects in the prior art: 1. The cavity space of the nozzle is too small, resulting in the problem that the amount of material available for molding is too small; 2. Due to the limitation of the thermal conductivity of the material, relying solely on the heating of the outer wall of the cavity makes the melting efficiency of the material relatively low. Low; 3. After the compressed gas that provides the extrusion force enters the nozzle cavity, due to the excessive impact on the molten material, it is easy to enter the material layer or break down the material layer, causing gas inclusions in the formed part or causing forming failure; 4 .In the case of a large material thickness in the barrel of the nozzle, the material at the edge of the cavity is prone to aging due to the uneven melting state caused by the low thermal conductivity of the forming material itself

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