Abstract:To seek for the optimal forming parameters of the roller briquetting machine with plungers and explore the influence law of the forming parameters on the forming results, sawdust was used as the raw material, the moisture content, the length to diameter ratio of the forming mold and the spindle speed were taken as the experimental factors, while the density of the forming particle and the productivity of the briquetting machine as the experimental indexes, the experimental data was processed and analyzed by the experiment design method of Design-Expert BBD (Box-Behnken Design), and the regression equations of the experimental factors on the experimental indexes were established. The results showed that the optimal results of the moisture content of sawdust, the length to diameter ratio of the forming mold and the spindle speed were 15.5%, 5.3, 47.25r/min,respectively. On this condition,the density of the forming particle and the productivity of the briquetting machine can reach 1.17g/cm3, 75kg/h, respectively. The contribution rate of the experimental factors on the forming particle density in the order from large to small: the length to diameter ratio of the forming mold, the spindle speed, the moisture content, while on the density of the forming particle: the moisture content, the length to diameter ratio of the forming mold, the spindle speed. The maximum relative error is 0.426% between the experimental value and the predicted value of the density of the forming particle,while it’s 2.733% on the productivity of the briquetting machine, so theres high consistency.