金刚石刀具研磨声发射信号的非高斯性特征分析

发布时间：2019-02-11 16:20

【摘要】：为确保金刚石刀具的制备效率和质量,采用声发射信号作为监测手段对金刚石刀具的精密研磨辅助进行过程调控.然而,该声发射信号的有效特征不能通过传统的信号处理方法辨识,实际研磨中仅能通过人工监听和操作经验定性判断.因此,本文从砂轮磨粒与刀具研磨面的微观接触特点出发,采用泊松过程模型对金刚石刀具研磨中声发射信号的激励机制进行了分析,阐明该信号具有非高斯性特征,采用线性系统理论阐明这一特征可被不失真地传输和接收,同时也给出了该信号高斯化近似的约束条件.最后通过工艺实验验证了该声发射信号的非高斯性特征在金刚石刀具研磨过程中的存在性,也证实了这一特征不受研磨速度和研磨压力等工艺参数的影响,而是与刀具研磨面的耐磨方向存在固有关联关系,从而为声发射信号监测在金刚石刀具研磨自动化系统中的合理应用奠定了方法基础.
[Abstract]:In order to ensure the preparation efficiency and quality of diamond tools, acoustic emission signals are used as monitoring means to control the process of precision grinding of diamond cutting tools. However, the effective features of the acoustic emission signal can not be identified by the traditional signal processing method. In the actual grinding, it can only be judged by human monitoring and operation experience. Therefore, starting from the microscopic contact characteristics of grinding wheel abrasive particles and grinding surface of cutting tools, this paper analyzes the excitation mechanism of acoustic emission signals in diamond tool grinding by using Poisson process model, and clarifies that this signal has non-Gao Si characteristics. The linear system theory is used to illustrate that this characteristic can be transmitted and received without distortion. At the same time, the constraints of Gao Si approximation of the signal are also given. Finally, the existence of the non-Gao Si characteristic of the acoustic emission signal in the diamond tool grinding process is verified by the process experiment, and it is also proved that this feature is not affected by the grinding speed and grinding pressure and other technological parameters. There is an inherent correlation between the wear resistance direction of the grinding surface and the tool grinding surface, which lays a foundation for the rational application of acoustic emission signal monitoring in the diamond tool grinding automation system.
【作者单位】：哈尔滨工业大学精密工程研究所;中国工程物理研究院机械制造工艺研究所;
【分类号】：TG71;TG580.68

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