齿轮钢18Cr2Ni4WA磨削烧伤实验及仿真预测研究

发布时间：2018-08-28 18:11

【摘要】：18Cr2Ni4WA钢以其韧性好和强度高的特点,广泛使用于螺旋伞齿轮等重载齿轮的生产与制造。磨齿作为齿轮加工的最后工序,磨削区域较高温度场容易引起磨削烧伤发生,使加工表面质量和疲劳寿命难以保证。针对齿轮钢18Cr2Ni4WA磨削烧伤问题,设计SG砂轮磨削实验,研究其发生磨削烧伤时表面形貌、显微硬度的变化规律,并通过有限元仿真预测烧伤层深。研究结果表明:当砂轮速度为20.3m/s、工件速度为0.03m/s、磨削深度大于0.05mm时工件发生磨削烧伤,随着磨削深度的增加,烧伤程度加重,磨削表面氧化层颜色由淡黄色转为褐色最后呈现青色,表面形貌由纹理清晰转为涂覆;工件产生回火烧伤时,产生硬度较低的回火索氏体;烧伤层深的仿真模拟值与实验测量值基本吻合,验证了有限元仿真对磨削烧伤预测的可行性。
[Abstract]:18Cr2Ni4WA steel is widely used in the production and manufacture of spiral bevel gears and other heavy-duty gears due to its good toughness and high strength. Grinding gear is the last working procedure of gear machining. High temperature field in grinding area can easily cause grinding burn, which makes the surface quality and fatigue life difficult to guarantee. Aiming at the problem of 18Cr2Ni4WA grinding burn of gear steel, the grinding experiment of SG wheel was designed to study the change of surface morphology and microhardness during grinding burn, and the depth of burn layer was predicted by finite element simulation. The results show that when grinding wheel speed is 20.3 m / s, workpiece speed is 0.03 m / s, grinding depth is greater than 0.05mm, grinding burn occurs, and the degree of burn increases with the increase of grinding depth. The color of the oxidized layer on the grinding surface changed from light yellow to brown, and the surface appearance changed from clear texture to coating, and when the workpiece was tempered and burned, the tempered Soxhlet body with lower hardness was produced. The simulated values of burn layer depth are in good agreement with the experimental measurements, which verifies the feasibility of the finite element simulation for grinding burn prediction.
【作者单位】：北京理工大学先进加工技术国防重点学科实验室;北京北方车辆集团有限公司;
【基金】：国家国防科技工业局技术基础科研项目(A0920132008) 国家重点基础研究计划项目(2015CB059900)
【分类号】：TG580.6

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