挖掘机工作臂高强度钢板的矫直理论与试验研究
发布时间：2019-04-18 18:25
【摘要】：挖掘机是一种在土石开挖等方面具有不可替代作用的重要工程设备,核心部件质量诊断、智能化及整机轻量化是其发展的三大主要方向。针对钢板平直度对挖掘机工作臂焊接质量存在重要影响的问题,在传统辊式矫直理论的基础上,依据三点弯曲理论、板材变形特点及分层理论建立板材矫直过程中的应力中性层偏移量计算模型,从理论上证明中性层偏移现象的存在以及它与反弯半径、板材厚度及材质的关系。通过室温拉伸试验得到高强钢板Q690的力学性能以此作为模型构建的参数基础;再结合弯曲试验研究矫直过程中性层偏移规律,得到中性层偏移值与反弯半径的变化关系。在本课题组多辊矫直机试验平台上对中性层偏移理论进行验证,结果表明考虑中性层偏移的Q690钢板平直度小于1 mm/m。
[Abstract]:Excavator is an important engineering equipment which plays an irreplaceable role in earth and rock excavation. The quality diagnosis of core components intelligent and lightweight of the whole machine are the three main directions of its development. In view of the important influence of flatness of steel plate on the welding quality of excavator's working arm, based on the traditional roll straightening theory and according to the three-point bending theory, The calculation model of stress neutral layer offset in the process of plate straightening is established based on the deformation characteristics and layering theory. The existence of neutral layer migration and its relation to the back bending radius, plate thickness and material are proved theoretically. The mechanical properties of high strength steel plate Q690 were obtained by tensile test at room temperature as the parameter foundation of the model, and then the migration rule of neutral layer during straightening was studied in combination with bending test, and the relationship between the deviation value of neutral layer and the reverse bending radius was obtained. The theory of neutral layer migration is verified on the multi-roll straightening machine test platform of our research group. The results show that the flatness of Q690 steel plate with neutral layer migration is less than 1 mm/m..
【作者单位】： 太原科技大学机械工程学院;沃尔沃设备建筑技术(中国)有限公司;
【基金】：国家自然科学基金(51675362) 山西省“青年三晋学者”计划资助项目
【分类号】：TU621
本文编号：2460241
[Abstract]:Excavator is an important engineering equipment which plays an irreplaceable role in earth and rock excavation. The quality diagnosis of core components intelligent and lightweight of the whole machine are the three main directions of its development. In view of the important influence of flatness of steel plate on the welding quality of excavator's working arm, based on the traditional roll straightening theory and according to the three-point bending theory, The calculation model of stress neutral layer offset in the process of plate straightening is established based on the deformation characteristics and layering theory. The existence of neutral layer migration and its relation to the back bending radius, plate thickness and material are proved theoretically. The mechanical properties of high strength steel plate Q690 were obtained by tensile test at room temperature as the parameter foundation of the model, and then the migration rule of neutral layer during straightening was studied in combination with bending test, and the relationship between the deviation value of neutral layer and the reverse bending radius was obtained. The theory of neutral layer migration is verified on the multi-roll straightening machine test platform of our research group. The results show that the flatness of Q690 steel plate with neutral layer migration is less than 1 mm/m..
【作者单位】： 太原科技大学机械工程学院;沃尔沃设备建筑技术(中国)有限公司;
【基金】：国家自然科学基金(51675362) 山西省“青年三晋学者”计划资助项目
【分类号】：TU621
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