摘要
环模成型机是生物质燃料的主要加工设备,由于环模在生产过程中容易发生疲劳破坏,因此对其进行应力及疲劳分析具有重要意义。利用流固耦合分析法对以沙柳细枝颗粒为生产原料的环模成型机进行综合分析,通过简化压辊与环模模型,在保证结果精度的前提下缩短了仿真分析所需要的时间,采用的湍流模型能够更准确地反映出物料在成型过程中的流动特性。将流体域和固体域的结果进行耦合分析,得到了压辊和环模部件的最大变形量分别为0.608和0.600 mm,最大应力分别为30.50和90.05 MPa,均发生在压辊与环模的最小间隙处。分析得出压辊与环模的疲劳寿命云图,结果显示,在生物质成型过程中,环模在靠近模孔位置处由于应力集中更容易发生疲劳破坏,其最小寿命为3.12×10^6次。最后通过与传统应力分析方法得到的环模疲劳寿命结果进行比较,运用流固耦合分析法得到的环模疲劳寿命分析结果更加符合实际的磨损和疲劳情况,验证了运用流固耦合对环模压辊进行应力分析以及疲劳分析方法的可行性,同时为环模的研发提供了理论支持和方法借鉴。
The ring molding machine is the major processing equipment for producing biomass products.The key parts of the ring forming machine are prone to fatigue damage during the production process,which would affect the production efficiency.Therefore,it is necessary to analyze the stress and fatigue of the parts of the ring molding machine which are prone to fatigue failure.This research mainly used the fluid-solid coupling analysis method and used the salix fine-grain particles as the raw material for simulation analysis to comprehensively investigate the performance of the pressure roller and ring mold of the ring forming machine under the working condition.A suitable operation was to simplify the three-dimensional model of the pressure roller and the ring mold of the molding machine,which shortened the time and effort used on the simulation analysis to ensure the accuracy of the analysis results.A more accurate operation was to use a turbulence model,which could more accurately reflect the flow characteristics of the raw material in the working area of the ring mold and the pressure roller during the molding process.The fluid domain was simulated separately.Similarly,the solid domain was also analyzed separately.After that,the results of the separate analysis were coupled and analyzed,which was the most critical step in the simulation analysis.The maximum deformation of the pressure roller and the ring die part was 0.608 and 0.600 mm,respectively,and the maximum stresses were 30.50 and 90.05 MPa,respectively.For the maximum deformation and maximum stress of the ring die and the pressure roller,the results showed that they all occurred at the smallest gap between the pressure roller and the ring mold.The fatigue life cloud diagram of the pressure roller and the ring die was obtained.The fatigue life cloud diagram showed that,during the biomass molding process,the ring mold was more likely to be fatigue-damaged due to the stress concentration at the position closer to the inlet of the mold material.Its minimum life was 3.12×10^6 times.Finally,by comparing the fatigue life results of the ring model obtained by the traditional stress analysis method,the fatigue life analysis results of the ring model obtained by the fluid-solid coupling analysis method were more in line with the actual wear and fatigue.The final results verified the feasibility of using fluid-solid coupling method to stress analysis and fatigue analysis of ring mold and pressure roller,and could provide theoretical support and analytical methods for the design and production of ring molds.
作者
李震
王鹏
刘彭
高雨航
王宏强
LI Zhen;WANG Peng;LIU Peng;GAO Yuhang;WANG Hongqiang(College of Machine Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China)
出处
《林业工程学报》
CSCD
北大核心
2020年第1期122-128,共7页
Journal of Forestry Engineering
基金
国家自然科学基金(51666016)
内蒙古自治区自然科学基金(2016MS0544)
关键词
环模成型机
流固耦合
疲劳寿命
生物质成型
生物质燃料
ring molding machine
fluid-solid coupling
fatigue life
biomass molding
biomass fuel
