Method of representing extrusion pressure via three-point process based on Benbow-Bridgwater model

Abstract

The invention discloses a method of representing extrusion pressure, in particular to a method of representing extrusion pressure via a three-point process based on Benbow-Bridgwater model; the method comprises the main steps of (1) acquiring extrusion pressure Pi via three-point testing; (2) calculating average extrusion pressure P0 when length-to-diameter ratio of a nozzle is equal to zero; (3) acquiring an analytical model for representing extrusion pressure via the three-point process. Extrusion pressure representation is one of the most key factors to successfully achieve the material extrusion technique or not; in traditional representation methods, a single-point method is used to estimate extrusion pressure when the length-to-diameter ratio of the nozzle is zero, and great errors are caused. In order to solve the problems, for example, traditional representation methods are low in precision, optimization of material extrusion systems and process parameters is not favored, and extrusion precision is affected, the simple, convenience and practical method for representing extrusion pressure is provided; extrusion pressure representing precision is improved, and the method may act as a common method of representing extrusion pressure.

Description

technical field [0001] The invention relates to a characterization method of extrusion pressure, in particular to a characterization method of extrusion pressure based on the Benbow-Bridgwater model, and belongs to the technical field of material extrusion. Background technique [0002] Material extrusion technology has very important applications in many fields, such as the field of additive manufacturing (3D printing). In January 2012, the American Society for Testing and Materials F42 Additive Manufacturing Committee standardized additive manufacturing technology. Material extrusion It is one of the seven main additive manufacturing technologies, which has a very broad application prospect and important application value. Extrusion pressure characterization is one of the most critical factors for the successful realization of material extrusion technology. In 1993, John Benbow and John Bridgwater established a model of paste material flow and extrusion, which is called th...

AI Technical Summary

Problems solved by technology

However, in the actual extrusion process of the paste material, even in a stable state, the local inhomogeneity of the paste material caused by the air bubbles and agglomeration in the paste material will cause fluctuations in the extrusion pressure. Therefore, using a single point The interpolation method to characterize the extrusion pressure causes a relatively large error between the predicted value of the extrusion pressure and the measured value, which is very unfavorable to the optimization of the material extrusion system and process parameters, and affects the extrusion accuracy. In severe cases, it will cause the extrusion process to fail

Images