| In the field of biomass molding, especially ring molding machine molding process, due to the friction and wear of high energy consumption, high cost, greatly weakened the penetration ring molding machine, the ring mold market accept ability has not been high. Thus control friction, reduce wear and improve the energy saving performance, and a reasonable potential of materials to play, such as the friction and wear of research is of material significance in the project.This paper studies done not only provide a theoretical basis for the selection of new biomass ring plunger molding equipment of key parameters, in order to "" twelfth five-year "National Science and Technology Support Program (2012BAD30B0205)" to support, as a lightweight removable ring mold biomass briquette manufacturing part of the key technology research, and the design and manufacture of new biomass ring plunger molding machines provide important theoretical and reference.In this paper, the nonlinear theory of fractal theory to graduate material forming materials-dynamic behavior of the ring mold die friction and wear processes, revealing the wear behavior of the law in the process, while the total amount of wear ring mold die to predict specific. The main contents are as follows:(1) Analyze the causes and forms of biomass plunger ring die molding machine failure, stress analysis of the ring mold and failure analysis to determine the wear ring mold is the main reason for the failure.(2) The use of fractal theory, combined with ring mold die rough surface fractal characteristics derived formulas ring mold die and the material of the contact area, Characterization ring mold die and molding materials rough surface curve fractal method WM function method, using MATLAB computing and modeling capabilities Solidworks establish contact with the surface of fractal geometry and ring die die-molding material surface contact finite element model.(3) Based on fractal theory and rough fractal surface contact model, establish the correctness consider forming materials and ring die die physical characteristics of the ring mold die inner wall wear prediction equation to predict the verification process at the same time explore the ring mold die wear prediction model Typical parameters of the relationship between the average wear rate, simultaneous analysis of different types of materials and material conditions ring ring die die die variation of the total amount of wear worn with time, and realize the die ring mold with a total amount of wear of the wear of time predicted to provide a theoretical basis for the plunger ring mold design.(4) The wear extent predicting for model of ring mold die was verified. And tests were measured by the wear of the ring mold and the two types of different specifications of the die, then correctness of the wear ring mold die predict the degree was verified.(5) On the friction ring mold die coupled thermal and structural analysis to determine the different moments ring mold die temperature and stress field distribution cases, the analysis in different materials and different shaped ring mold material conditions concave ring mold temperature and stress field distribution of mold temperature due to friction caused by heat.(6) The use of die friction contact surface fractal mathematical model for friction ring mold die during the highest temperature forecast and analyzed to determine the ring mold die fractal rough surface with the maximum temperature coefficient of friction, sliding speed, material function of mechanical and thermal variation of performance parameters, the true contact area, the contact area and the nominal surface profile of the fractal parameters.This paper has important implications for agricultural machinery, feed processing machinery design, manufacturing, for the promotion of the plunger ring molding machine application and implementation of large-scale use of biomass resources is important, is a basic theory with deep and broad application prospects research. |
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