CAJ | 학술논문

轴承钢球毛坯螺旋孔型斜轧工艺设计和变形行为较为复杂，传统的解析计算和物理试验方法不能有效揭示其轧制变形机理。探讨总结了钢球毛坯热斜轧成形主要建模技术与方法，基于SIMUFACT有限元软件平台首次建立了钢球毛坯热斜轧成形三维热力耦合有限元仿真模型。基于有限元模拟结果详细分析了轴承钢球毛坯热斜轧成形过程等效应变、应力、温度和轧制力能参数的分布与演变规律，证明钢球毛坯斜轧心部疏松或空洞缺陷的产生是由其在轧制过程承受的循环交变切应力、较高水平的横向拉应力和由多向拉应力引起的较大负静水压应力（正的平均应力）共同作用的结果。
축승강구모배라선공형사알공예설계화변형행위교위복잡，전통적해석계산화물리시험방법불능유효게시기알제변형궤리。탐토총결료강구모배열사알성형주요건모기술여방법，기우SIMUFACT유한원연건평태수차건립료강구모배열사알성형삼유열력우합유한원방진모형。기우유한원모의결과상세분석료축승강구모배열사알성형과정등효응변、응력、온도화알제력능삼수적분포여연변규률，증명강구모배사알심부소송혹공동결함적산생시유기재알제과정승수적순배교변절응력、교고수평적횡향랍응력화유다향랍응력인기적교대부정수압응력（정적평균응력）공동작용적결과。
Due to the complexity of process design and deformation behaviors during the hot helical rolling of bland for bearing steel balls,the traditional methods of analytical calculation and physical experiments are difficult to investigate its rolling deformation mechanisms.The main modeling techniques and methods for hot helical rolling forming of steel balls are discussed and summarized,and a 3D coupled thermo-mechanical finite element simulation model is firstly de-veloped based on SIMUFACT finite element software platform.Based on finite element simulation results,the distribution and evolution rules of equivalent strain,stress,temperature and rolling force and power parameters during hot helical roll-ing forming process of bland for bearing steel balls are analyzed in detail.It is proved that the central loosen or cavity de-fects during helical rolling of blank for steel ball is the combination result of circular-alternating shear stress,higher lev-el transverse tensile stress and larger negative hydrostatic pressure (positive mean stress)caused by multi -directional tensile stresses.