METHOD FOR ADDITIVE EXTRUSION OF BULK PRODUCTS AND EXTRUDER FOR ITS IMPLEMENTATION Russian patent published in 2021 - IPC B29C64/118 B33Y10/00 B29C64/20 

FIELD: additive technologies.

SUBSTANCE: inventions group relates to the field of additive technologies for growing volumetric products of complex shape by the method of sequential extrusion and fixation of two-dimensional layers of molten polymer material with subsequent curing and can be used in the manufacture of tooling molds for electroforming and small series of products of any complexity in various industries. The method of additive extrusion of volumetric products includes designing a 3D model of a volumetric product with its transformation into a set of two-dimensional layers with appropriate contours, supplying a consumable polymer material to a melting zone with a controlled temperature and heating it to a molten state, sequential repetitive localized extrusion of molten material with movement of the nozzle to obtain two-dimensional layers with their imposition on the base of the volumetric product and on top of each other and subsequent curing. The supply of the consumable polymer material into the melting zone is carried out with air or water cooling until the consumable polymer material is given the necessary elasticity with the possibility of pressure on the molten material by a buffer created by the plasticity of the polymer material when it enters the liquid phase, and localized extrusion of two-dimensional layers with their application to the base of the product and on top of each other with subsequent curing and fixation by blowing each deposited layer with air preheated to a certain temperature corresponding to the properties of the deposited polymer material. An electrically conductive hybrid dispersion-hardened composite material is used as a polymer material. According to one embodiment, the extruder comprises a device for feeding filament into the extruder, an induction heater, an extrusion head with a nozzle for extruding the molten filament. The induction heater contains a crucible with a heating inductor located outside the crucible, and the filament feeding device is a water-cooling radiator located at a distance from the induction heater, connected by a rod with an axial channel for filament feeding into the melting zone, made with an external groove that reduces heat transfer between zones of cooling and melting of the filament. On the rod at the bottom of the radiator, there is an additional sensor for monitoring the temperature of the filament cooling, and at the end of the extrusion head, in which the temperature sensor of the extruded molten filament is installed.

EFFECT: invention improves quality and productivity of additive extrusion of bulk products.

6 cl, 2 dwg