摘要
文章旨在建立旋转挤压制粒过程的力学模型并对各影响因素进行讨论。通过对旋转挤压制粒原理进行分析,指出制粒过程的本质是通过模辊载荷作用将物料在模孔内压制成颗粒的过程。基于广义胡克定律建立了模孔内物料挤压成型的压强模型,通过模孔压强的曲面图分析各因素的影响规律和作用机理。分析结果表明,原料纤维朝向对制粒性能的影响是由于物料各向泊松比差异造成的;物料特性(泊松比、摩擦系数)和模孔长径比对成型压强影响很大,尤其当各参数数值较大时模孔型压强的增大趋势十分显著。该研究结论对于降低制粒能耗和延长环模使用寿命提供了有效的理论依据。
Purpose of this study was to establish a mechanical model of rotary extrusion forming. According to the basic principle of rotary extrusion forming, the mechanism of pelleting could be simplified as a densification process of material in the die hole. Based on the generalized Hooke＇s law, the mechanical model of extruding pressure during the pelleting process was developed. The changing surfaces of extruding pressure were plotted on the basis of the model, and the effects of the factors on extruding pressure were studied. The analysis results showed that the effect of fiber orientation on compression and frictional properties was caused by the material Poisson ratio in different directions, and the material properties （Poisson ratio and friction coefficient） and compression ratio had great effects on extruding pressure, especially if the parameters were large. The results can provide reliable theoretical basis for reducing energy consumption and extending the service life of pellet mill.
作者
蒋清海
武凯
孙宇
李庆凯
Jiang Qinghai, Wu Kai, Sun Yu, Li Qingkai
出处
《饲料工业》
北大核心
2018年第7期6-10,共5页
Feed Industry
基金
国家饲料加工装备工程技术研究中心项目[2012FU125Q06]
关键词
旋转挤压
制粒
受力分析
压强模型
rotary extrusion
pelletizing
mechanical analysis
pressure model
