GCr15管变螺距孔型设计及轧制切断工艺  

Design and rolling cutting process on GCr15 tube variable pitch hole

作　　者：顾震 庞玉华[1,2] 刘东 张润强[4] Gu Zhen;Pang Yuhua;Liu Dong;Zhang Runqiang(School of Metallurgical Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China;Shaanxi Metallurgical Engineering Technology Center,Xi′an 710055,China;School of Materials,Northwestern Polytechnical University,Xi′an 710072,China;Anhui Dongyun Intelligent Equipment Manufacturing Co.,Ltd.,Suzhou 234000,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]陕西省冶金工程技术中心,陕西西安710055 [3]西北工业大学材料学院,陕西西安710072 [4]安徽东耘智能设备制造有限公司,安徽宿州234000

出　　处：《锻压技术》2023年第10期102-107,共6页Forging & Stamping Technology

摘　　要：针对等螺距螺旋轧制切断轴承管存在明显的外表面缺角的问题,依据螺旋轧制理论,明确了任意径向压下量与轴向延伸量之间的定量关系,探讨了通过逐渐减小螺距缩减轴向延伸变形、进而提高孔型充满度的方法,建立了严控缺角量的变螺距法轧制模型。采用刚塑性有限元数值模拟技术,论证了变螺距法可获得4%以内的轴向及径向缺角率,以及增加导板限制横变形后,不仅可以继续降低缺角率,还可将管圆度提高至1.01。等螺距和变螺距法的轧制力及轧制力矩均呈现波动性逐渐增加的规律,平均压力和力矩分别为15.2和18.2 kN以及914.4和884.5 N·m,相差约为16.4%和3.3%。研究成果对轴承管高精度切断具有一定的理论及实际意义。For the obvious missing angle problem on the outer surface of bearing tubes by equal-pitch spiral rolling cutting,according to the spiral rolling theory,the quantitative relationship between arbitrary radial reduction and axial extension was clarified,and methods to improve hole filling were explored by gradually reducing the screw pitch to reduce axial extension deformation,and a variable pitch rolling model that strictly controlled the amount of missing angles was established.Then,using rigid-plastic finite element numerical simulation technology,it was confirmed that the axial and radial missing angle rates within 4%was obtained by the variable pitch method,and after adding a guide plate to limit lateral deformation,it not only continued to reduce the missing angle rate,but also improved the tube round-ness to 1.01.The rolling force and rolling moment of the variable pitch and equal pitch methods showed a gradual increase in volatility,and the average pressure and moment were 15.2,18.2 kN,914.4 and 884.5 N·m,respectively,with difference of approximately 16.4%and 3.3%.Thus,the research results had certain theoretical and practical significance for high-precision cutting of bearing tubes.

关 键 词：轴承管 螺旋轧制 变螺距 等螺距 轴承缺角 孔型设计 

分 类 号：TG332.21[金属学及工艺—金属压力加工]