A dlp printing control method based on the absorbance properties of photocurable materials

Abstract

The invention discloses a DLP printing control method based on the light-curing material absorbance property. Add the light absorber to the light-curing material for DLP printing, test the liquid and solid absorbance per unit thickness of the light-curing material under different light absorber concentrations, calculate the ratio as the actual solid-liquid absorbance ratio, and compare it with the solid-liquid absorbance Compared with the theoretical prediction value of the ratio, the selected concentration of the light absorber in the actual photocurable material is obtained; the curing threshold time of the photocurable material is measured, and the solid absorbance per unit thickness, liquid absorbance per unit thickness and curing threshold of the photocurable material The time is brought into the single-layer curing model, and the processing obtains the exposure time t T The relationship with the curing thickness H; for the case to be tested, input the curing thickness to obtain the exposure time for DLP printing control. The invention can accurately obtain the DLP light-curing printing parameters of materials, avoid complicated and repeated forming experiments and tests, and save materials more accurately.

Description

technical field [0001] The invention belongs to a printing control method in the technical field of additive manufacturing, and in particular relates to a method for obtaining DLP printing parameters of a light-curing material through the absorbance properties of the light-curing material and then controlling printing. Background technique [0002] The full name of DLP (Digital light processing) is "Digital Light Processing" technology. Based on the imaging principle of DMD chips reflecting ultraviolet light, photosensitive resin is used as raw material, and UV ultraviolet light carrying graphic information transforms the photosensitive resin in a liquid state into a solid with a certain thickness, and repeats multiple single-layer forming to form a three-dimensional model. Determining an accurate relationship between exposure time and forming thickness determines a good forming result of DLP light curing technology. [0003] The traditional method of determining the relati...

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Problems solved by technology

[0005] 1. Accurate data fitting requires more "time-layer thickness" data points, and more materials need to be consumed for forming experiments to test, which has a lot of waste of materials, and is accompanied by the measurement and calculation of the forming structure , not directly but also with many steps

[0006] 2. If the material composition changes, the forming experiment needs to be retested. The data results of the forming experiment are not scalable, which increases the waste of materials

[0007] 3. For materials with soft mechanical properties, the model used to measure the layer thickness is difficult to form, it is difficult to accurately obtain the formed layer thickness, and the "time-layer thickness" data point cannot be accurately obtained, which affects the precise forming of soft materials

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