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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
Published on: November 22, 2021
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在高强度钢的料削中分析可研磨性和表面完整性
1State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Materials (Basel, Switzerland)
|April 27, 2024
概括
为了防止在高强度钢的爬行料研磨过程中发生热损伤,立方化 (CBN) 轮子优于砂 (SG) 轮子. CBN有效地降低了研磨能量,并控制了表面粗度,以提高零件性能.
科学领域:
- 材料科学与工程 材料科学与工程
- 制造过程 制造过程 制造过程
- 部落学 (tribology) 是一个学科.
背景情况:
- 高强度钢的料削通常会导致轮子过度磨损和热损伤,损害部件的服务性能.
- 了解可研磨性和表面完整性对于优化这些苛刻材料的加工流程至关重要.
研究的目的:
- 通过使用砂 (SG) 和立方化 (CBN) 磨轮,研究高强度钢的研磨性和表面完整性.
- 确定影响热损伤缺陷的关键因素,并提出实现无燃磨削的方法.
主要方法:
- 在使用 SG 和 CBN 磨轮的高强度钢上进行了爬行料研磨试验.
- 分析了研磨力,加工温度和研磨的特定能量.
- 评估表面完整性,包括形态,粗性,残余应力和硬度.
主要成果:
- 高温超过钢的相变温度会导致热损伤,改变表面层的微观结构.
- 与SG轮子相比,CBN轮子在抑制研磨烧伤方面表现优越,因为它们的硬度和导热性.
- 研磨CBN可减少约33%的特定能量,并保持表面粗度低于0.8微米.
- 热损伤表现为氧化变色,质感变化,硬度降低和剩余拉伸应力.
结论:
- 对于高强度钢材研磨,CBN磨料比SG磨砂更有效,可以更好地控制热损伤.
- 减少热量产生和增强热疏散对于实现高强度钢的无燃研磨至关重要.
- 这些发现为高质量的加工和高端组件的精密制造提供了宝贵的技术指导.
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