剥肋滚压复合工艺及其设备研究  

Research on Symmetrical Rib Stripping and Rolling Composite Process and Its Equipment

作　　者：蒋飞 赵升吨[1,2,3] 范淑琴[1,2] 王可心 陈超[3] JIANG Fei;ZHAO Shengdun;FAN Shuqin;WANG Kexin;CHEN Chao(School of Mechanical Engineering,Xi’an Jiaotong University,Xi’an 710049;Xi’an Key Laboratory of Intelligent Equipment and Control,Xi’an Jiaotong University,Xi’an 710049;Light Alloy Research Institute,Central South University,Changsha 410083)

机构地区：[1]西安交通大学机械工程学院,西安710049 [2]西安交通大学西安市智能装备与控制重点实验室,西安710049 [3]中南大学轻合金研究院,长沙410083

出　　处：《机械工程学报》2024年第8期132-142,共11页Journal of Mechanical Engineering

基　　金：国家自然科学基金航空联合基金(U1937203);湖南省“湖湘高层次人才”(2021RC5001);陕西省自然科学基金面上(2023-JC-YB-353)资助项目。

摘　　要：面对我国对建筑钢筋的庞大需求以及钢筋两端高效精密制造出螺纹的要求,迫切需要新的加工工艺和设备来满足。分析各类螺纹滚压工艺原理、特点和工艺参数之间的关系,提出一种钢筋剥肋滚压复合新工艺。基于该工艺设计并研制了对称式剥肋滚压设备,滚压模具相位保持机构和对称机构显著提高了钢筋端头螺纹成形的可靠性和效率。通过静力学分析了主轴变形以及箱体模态。利用有限元分析了滚压过程的塑性变形情况和材料流动规律,发现滚压过程中螺纹成形的等效应变随着模具的进给而增加,在切入段集中在齿廓周围,校正段和成形段均分布在整个螺纹,且坯料芯部没有应力和应变发生。牙侧材料从底部流向顶部导致齿高逐渐变高,且牙底的轴向位移最大。在所研制的设备上开展了剥肋滚压试验,验证了剥肋滚压工艺及其设备的可行性与可靠性,结果表明适当增加钢筋的剥肋直径可消除齿顶拉尖现象,同时精确的模具中心距是保证成形螺纹尺寸精度的重要因素。In the face of my country’s huge demand for construction rebar and the requirements for efficient and precise manufacture of threads at both ends of the rebar,new processing techniques and equipment are urgently needed to meet the requirements.The relationship between the principles,characteristics and process parameters of various thread rolling processes is analyzed,and a new composite process for stripping and rolling of rebar is proposed.Based on this process,a symmetrical rib-stripping rolling equipment is designed and developed.The rolling die phase-maintaining mechanism and the symmetrical mechanism significantly improve the reliability and efficiency of the thread forming of the rebar.The deformation of the main shaft and the mode of the box are analyzed by statics.The plastic deformation and material flow law in the rolling process were analyzed by finite element analysis,and it is found that the equivalent strain of thread forming during the rolling process increases with the feed of the die,and concentrated around the tooth profile in the cutting section,the correction section and the forming section.The segments are distributed over the entire thread,and no stress or strain occurs in the blank core.The flow of flank material from the bottom to the top resulted in a gradual increase in the tooth height,and the axial displacement of the tooth root is the largest.The rib stripping and rolling test is carried out on the developed equipment to verify the feasibility and reliability of the rib stripping rolling process and its equipment.The results show that the increase of blank diameter could eliminate the defect of tooth tip.The die center distance is an important factor to ensure the dimensional accuracy of the formed thread.

关 键 词：钢筋 螺纹滚压 滚压设备 有限元 塑性变形 

分 类 号：TG335[金属学及工艺—金属压力加工]