Large-size additive-subtractive-integrated FDM printing head

Abstract

The invention discloses a large-size additive-subtractive-integrated FDM printing head. According to the printing head, by arranging a cutting device and a hot roller device on the rear portion of theprinting head, if the defect that the two sides of a printed workpiece exceed the size of a model exists, the excessive parts are cut by the cutting device following behind; hot rollers are arrangedbehind the cutting device, a step is bridged through the hot rollers, thus, the concave part of the step is remedied by the protrusion part of the step, and the surface quality is improved; the layer-to-layer binding force is determined by the binding area of the concave part, thus, the layer-to-layer binding area is increased through the method, the layer-to-layer binding force is improved, and the mechanical property of the whole printed workpiece is improved; in the whole cutting process, organic dust is not generated, the machining environment is good, compared with existing mechanical subtractive manufacturing, the surface gloss after heat working and the surface consistency after 3D printing forming are good, and no obvious machining trace exits. A subtractive device is small in size, other machining equipment does not need to be arranged additionally, the occupied area is small, and the cost is low.

Description

【Technical field】 [0001] The invention belongs to the field of additive manufacturing, and in particular relates to an FDM print head integrating large-scale addition and subtraction of materials. 【Background technique】 [0002] In order to improve the printing efficiency, the fused deposition modeling (FDM) process needs to expand the diameter of the print head, but it increases the step effect of the product, making it more difficult to treat the surface quality of the workpiece, and it is difficult to improve the surface quality by means of grinding or polishing. [0003] Large-scale additive manufacturing parts can not only be used in aerospace and automotive fields, but also in home decoration, cultural and creative fields, etc., and have broad application prospects. For occasions with high requirements for industrial applications, the method of increasing first and then decreasing ensures the surface quality, but greatly increases the cost of equipment and reduces prod...

Images