Wire feeding speed control system and method of FDM rapid molding machine

Abstract

The invention relates to a control technology of a fused wire deposition molding 3D printing device and aims at providing a wire feeding speed control system and a wire feeding speed control method of an FDM rapid molding machine. The system comprises a pressure sensor arranged on an FDM printing nozzle; the pressure sensor and a pressure setting module are connected with a closed ring control module; the closed ring control module is sequentially connected with a motor control module and a wire feeding motor by a signal wire; and the wire feeding motor is connected with a friction wheel by transmission equipment. According to the system, a wire feeding speed is indirectly controlled according to the pressure of fused printing materials in a printing nozzle mold cavity, so that a wire feeding mount and a wire discharging amount are the same and the molding quality of fused wire deposition molding (FDM) is improved. The control on the wire feedings peed has better self-adaptability; and the influence on the wire feeding amount, caused by various interference factors of the outside, can be overcome through real-time online closed ring calculation control of the closed ring control module, so that the printing nozzle keeps a fixe wire discharging speed to print and the printing quality is improved.

Description

technical field [0001] The present invention relates to a control method of a fused deposition modeling (Fused Deposition Modeling, FDM) 3D printing device. More specifically, the present invention relates to a wire feeding speed control system and method for an FDM rapid prototyping machine. Background technique [0002] Fused Deposition Modeling (Fused Deposition Modeling, FDM) is a 3D printing processing method, which is currently one of the fastest-growing and most promising rapid prototyping technologies. The FDM rapid prototyping machine consists of a wire feeding mechanism, a printing nozzle, a motion control structure, a printing nozzle temperature control module, and a controller. The working principle of fused deposition modeling is to melt hot-melt materials (such as ABS, wax, etc.) through a heater, and the materials are first drawn into filaments for printing. Then the FDM molding equipment sends the filamentary printing material into the hot-melt nozzle throug...

AI Technical Summary

Problems solved by technology

The current FDM rapid prototyping machine basically uses a fixed speed for constant speed control, but the actual density of different types of materials is different, and the thickness of the printing materials is not uniform enough to affect the quality of the printing materials that actually enter the printing nozzle. At the same time, different The printing speed and the fluctuation of the printing speed will affect the speed of the filament, so the fixed printing speed control may cause problems such as uneven thickness of the initial speed and clogging of the printing nozzle

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