Abstract:Based on the complexity of friction behavior during straw compressing, the friction characteristics between 45# steel and rice straw briquettes of
9JYK2000A straw briquetting machine were investigated. The orthogonal experiment was designed with briquettes density, water content, pressure and
friction velocity as influence factors, and the friction coefficient between straw briquettes and 45# steel was used as test index.The test results were
analyzed by extreme difference analysis and variance analysis. According to the experimental results, the wear depth for different friction coefficients was
simulated, and the predictive model of sliding friction was derived. The results show that the decreasing influence sequence of forming factors on friction
coefficient between straw briquettes and 45# steel is followed by briquettes density,water content,friction velocity and pressure. Briquettes density,
water content and friction velocity have marked effect on friction coefficient markedly, while pressure affects indistinctively. The optimal indicators for
wear depth are obtained with briquettes density of 1.5 g·cm-3, water content of 28%, pressure of 20 N and friction velocity of 5 mm·s-1.There is an
optimum fractal dimension of friction surface to result in the minimum sliding friction.