TAILIEUCHUNG - Cảm biến trong sản xuất P11

Abrasive processes, which are mostly applied for achieving high accuracy and high quality of mechanical, electrical, and optical parts, can be divided into two categories, fixed abrasive processes and loose abrasive processes. In fixed abrasive processes, grinding wheels or honing stones are used as tools and the abrasives are held together with bonding material, also providing sufficient pores for chip removal. In loose abrasive processes, the individual grains are not fixed and are usually supplied together with a carrier medium. Among various types of abrasive processes, grinding is most widely applied in the industry. | 236 I 4 Sensors for Process Monitoring Sensors in Manufacturing. Edited by . Tonshoff I. Inasaki Copyright 2001 Wiley-VCH Verlag GmbH ISBNs 3-527-29558-5 Hardcover 3-527-60002-7 Electronic Abrasive Processes I. Inasaki B. Karpuschewski Keio University Yokohama Japan Introduction Abrasive processes which are mostly applied for achieving high accuracy and high quality of mechanical electrical and optical parts can be divided into two categories fixed abrasive processes and loose abrasive processes. In fixed abrasive processes grinding wheels or honing stones are used as tools and the abrasives are held together with bonding material also providing sufficient pores for chip removal. In loose abrasive processes the individual grains are not fixed and are usually supplied together with a carrier medium. Among various types of abrasive processes grinding is most widely applied in the industry. This is due to the fact that the modern grinding technology can meet the demands of not only high-precision machining but also a high material removal rate. In addition some difficult to cut materials such as engineering ceramics can only be machined with abrasive processes. Problems in Abrasive Processes and Need for Monitoring The behavior of any abrasive process is very dependent on the tool performance. The grinding wheel should be properly selected and conditioned to meet the requirements on the parts. In addition its performance may change significantly during the grinding process which makes it difficult to predict the process behavior in advance. Conditioning of the grinding wheel is necessary before the grinding process is started. It becomes necessary also after the wheel has finished its life to restore the wheel configuration and the surface topography to the initial state. This peripheral process needs sufficient sensor systems to minimize the auxiliary machining time to assure the desired topography and to keep the amount of wasted abrasive material

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