Friction And Wear Analysis And Experimental Study On Ring Mold Of Rice Straw Vertical Briquetting Machine

The ring mode briquetting machine is to compact the straw into briquette,density and strength of rice straw have greatly improved by briquetting,not only conducive to the transport of straw material,but also improve the utilization of straw.However,the ring model briquetting machine exist serious wear problems of ring mold,which increase the cost of processing and reduce the efficiency of straw briquetting.In this paper,the wear mechanism,friction coefficient and wear prediction model were analyzed in view of the serious wear of ring module.Firstly,the working principle of rice straw ring briquetting machine and basic principle of forming in straw compression molding were analyzed,The mold of ring module after wear was obtained by straw extrusion test,and use electron microscopy to scan the wear surface of ring module,then analyzed the wear mechanism of the ring mold die,the wear of the ring mold was mainly caused by the abrasive wear and fatigue wear of the micro-cutting,which causes the loss of the material of the ring module,and analyzed the relationship between the extrusion force and the wear depth of the mold.The greater the pressure,the more serious mold wear.Secondly,the effects of straw briquetting density,water content,pressure and friction velocity on the friction coefficient between briquettes and metals were analyzed.Five-factor four-level orthogonal test was designed using SPSS19.0.According to the orthogonal test table,based on the analysis of the orthogonal test,The order of influence factors on the friction coefficient is density,water content,friction speed,pressure;Density,water content and friction rate have a significant effect on the test results,the pressure has no significant effect on the friction coefficient,and the effect of single factor on the friction was analyzed.With the increase of density and water content,the friction coefficient increases and then decreases.With the increase of velocity,the friction coefficient increases slightly.Then,using ANSYS15.0 finite element analysis software to simulate straw extrusion and thermal analysis of the extrusion model,and the thermal analysis results of the circular die hole are verified.The simulated values of the surface temperature of the ring press are consistent with the measured values basically.Finally,combined with the results of finite element coupling analysis and thermal analysis,the temperature and contact stress values of the measured nodes are extracted and the archard wear calculation models are used to calculate the wear of circular and square ring modules in 11 positions,the deepest wear of the round module is 0.146 mm,and square module is 0.167 mm.The test of the wear value of the ring module is carried out on the briquetting machine,and the calculation of the wear depth is not significant at the cone hole because the impact force can not be simulated in the simulation.In the direction of extrusion,the calculated value of the wear depth are consistent to the test value and the trend is consistent.