Flat Surface Lapping: Process Modeling in an Intelligent Environment
Flat Surface Lapping: Process Modeling in an Intelligent Environment
复制标题
DOI：
--
复制
发表时间：
2002-07
期刊：
影响因子：
--
通讯作者：
Owat Sunanta
中科院分区：
文献类型：
--
作者：
Owat Sunanta
由于涉及大量的可变性和主观性，研磨过程长期以来一直被认为是一门艺术。不同的操作员研磨质量不同，结果高度不一致。研磨工艺参数如研磨压力、研磨转速、研磨环材料、研磨质量和尺寸、磨料大小和类型、工件材料和硬度等对研磨效率、表面光洁度和平整度都有很大影响。为了达到预期的效果，必须为研磨控制参数选择合适的值。把搭接的艺术变成一门科学，并将结果量化，可以解决上面的许多问题。在这项研究中，设计了一种便携式机械研磨工具，并与手动研磨一起进行了测试。通过设计实验、文献检索和咨询专家对研磨过程进行了研究。利用各种统计技术对实验结果进行了详细分析，以解释潜在参数之间的关系，并查看研磨模型开发的可能性。还开发了初步的智能计算机研磨系统(咨询系统)，作为今后工作的框架。在研磨文献和研磨专家知识的基础上，提出了具有代表性的研磨定性模型和研磨规则。然而，人们发现，从不同来源获得的领域知识往往受到不精确和不确定性的影响，现有的制造问题数据往往不准确和不完整。为了克服这一问题，将模糊逻辑概念应用于开发基于知识的系统的协议。这项研究是精心设计的实验和数据分析的创举，旨在研究平板研磨的潜在参数，并将其应用于修复阀瓣和喷嘴阀座。
The process of lapping has been long considered an art due to the tremendous amount of variability and subjectivity involved. The quality of lapping differs from operator to operator and the results are highly inconsistent. The material removal rate, surface finish, and flatness all depend on the proper control of lapping parameters such as lapping pressure, lapping speed of rotation, lap ring material, weight and size, abrasive size and type, workpiece material and hardness. To attain the desired outcomes, it is imperative to select proper values for the lapping control parameters. Moving the art of lapping into a science and quantifying the results can solve many of the above problems. In this research, a portable mechanical lapping tool was designed and tested along with manual lapping. Lapping processes were studied by conducting designed experiments, literature search, and consulting experts. The results from the experiments were explored in detail using various statistical techniques to explain the relationships among potential parameters and to see the possibility of lapping model development. A preliminary intelligent computerized lapping system (advisory system) was also developed as a framework for future work. Representative qualitative models and rules for lapping were proposed based on lapping literature and lapping experts' knowledge. However, it was found that the domain knowledge obtained from different sources was often clouded by imprecision and uncertainty, and the available data of manufacturing problems were frequently imprecise and incomplete. To overcome this problem, fuzzy logic concepts were applied in developing a protocol for the knowledge-based system. This research is an initiative of well-designed experiments and data analyses in investigating potential parameters of flat surface lapping with an application on reconditioning valve discs and nozzle seats.