锻压技术

基于离散元-有限元耦合生物质成型模具寿命分析

英文标题：Life analysis on biomass forming mold based on discrete element and finite element coupling

作者：李震李金达沙潜毅于跃于今高耀东

单位：内蒙古科技大学

分类号：TK6

出版年,卷(期):页码：2022,47(8):171-177

摘要：

以沙柳细枝颗粒为生产原料，对环模成型机进行综合分析，并根据环模成型机的实际攫取物料工况，建立环模成型机的动力学仿真模型和物料离散元模型，利用ADAMS与EDEM对沙柳细枝颗粒的攫取过程进行DEM-MBD联合仿真，解决单一软件EDEM仿真压辊不能依靠摩擦力转动的问题，使仿真结果更加接近实际情况，并对仿真结果进行分析。结果表明：当环模转速为3~5 r·s-1时，颗粒所受最大压力随着环模转速的增加而增加，而当环模转速增大至5 r·s-1后，颗粒所受最大压力随着环模转速的增加而减小。将离散元与有限元进行耦合，对环模成型机的应力和变形进行分析，结果表明：环模和压辊的最大变形量分别为0.550760和0.42516 mm，最大等效应力分别为79.0710和32.6810 MPa，均发生在环模与压辊的最小间隙处。使用Ncode Designlife疲劳分析软件分析环模和压辊的疲劳寿命云图，结果表明环模较压辊更容易发生疲劳破坏。

Taking the salix twig granules as the production raw material, the ring molding machine was analyzed comprehensively, and according to the actual material grabbing situation of the ring molding machine, the dynamic simulation model and material discrete element model of the ring molding machine were established. Then, the grasping process of salix twig granules was DEM-MBD joint simulated by ADAMS and EDEM, which solved the problem that the pressure roller could not rely on friction to rotate by the single software EDEM simulation so that the simulation results were closer to the actual situation, and the simulation results were analyzed. The results show that the maximum pressure on the granules increases with the increasing of rotate speed for ring mold when the rotate speed of ring mold is 3-5 r·s-1, and when the rotate speed of ring mold increases to 5 r·s-1, the maximum pressure on the granules decreases with the increasing of rotate speed of ring mold. Furthermore, the stress and deformation of the ring molding machine were analyzed by coupling between discrete element and finite element. The results show that the maximum deformation amount of ring mold and pressure roller is 0.550760 and 0.42516 mm respectively, and the maximum equivalent stress is 79.0710 and 32.6810 MPa respectively, which all occur at the minimum gap between ring mold and preessure roller. The fatigue life nephograms of ring mold and pressure roller were analyzed by fatigue analysis software Ncode Designlife. The results show that the ring mold is more prone to fatigue damage than the pressure roller.

基金项目：

内蒙古自治区自然科学基金资助项目（2020LH05020）；国家自然科学基金资助项目（51666016）

作者简介：李震（1973-），男，博士，教授，E-mail：lizhen_730106@126.com；通信作者：李金达（1995-），男，硕士，E-mail：1005025847@qq.com

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