Rapid prototyping full compacted metal parts has becoming the focus of attention in the domain of rapid prototyping. In this paper, the method of forming full compacted metal parts by selective laser melting has been put out and the experimental researches on it have been carried out. The surface quality and the inner microstructure of the parts formed by selective laser melting were analyzed. The full compacted metal parts without any micro-cracks have been attained. The test results show that the tensile strengthen of 316L stainless steel parts formed by selective laser melting is greater than that of casting 316L stainless steel parts.

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The dressing on line of diamond grinding wheels used in NC optical curve grinding machines are very difficult. A method has been researched in this paper that is dressing the diamond grinding wheels by a diamond pen aided with laser beam preheating . Its principle has been stated. The temperature mathematics model of laser beam preheating diamond grinding wheels has been set up. The temperature field of resin substrate diamond grinding wheels has been calculated. Through the analyses on the results of the temperature field, it has been known that the distance between laser beam preheating central and the diamond pen dressing point be very small. A new method that is delived laser beam by optical fiber in dressing on line of diamond grinding wheels by a diamond pen aided with laser beam preheating has be proposed. Uasing this new method, a high precision and high efficiency in dressing diamond grinding wheels on line can be fulfiled.

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