Papers by Author: Jun Yao

Abstract: Combining the refrigeration and machining technology, the dry cold air at -35°C was gained. With the injecting feeding manner of the cold air for cutting, all application of the green technology is realized in turning manufacturing trials. In order to clarify the cooling and lubrication mechanism of cryogenic cold air, the cutting temperature, cutting forces, wear of cutting tool and cutting chip have been systematically researched with the help of numerical calculation and experiments. The cooling and lubrication effects, as well as the performance of machining quality improvement, enhanced by the low temperature air injecting, have also been analyzed in detail. The results arc as follows. Temperature measurements at several locations on the cutting tool insert agree with the simulation results. The performance of cooling-air spray jet with 25(Nm3/h ) on reducing the cutting tool temperature achieved a maximum effect

Abstract: Cooling-air grinding is one sustainably alternative processing technology to traditional grinding. In order to study the discipline and characteristic of cooling-air grinding, a new type of cooling-air generator for cooling-air grinding was designed and set up in the paper. And the compressed air of the system and the main processing equipment were introduced in detail. Performance tests showed that the device was able to meet the design requirements.

Abstract: Cooling-air grinding is one of important green grinding technology. Cooling-air grinding performances for 40Cr are tested in this paper using cooling-air generator. Main performance influencing factors are tested and analyzed, such as air temperature, wheel granularity, amount of feed and so on. Cooling-air grinding results showed that roughness of surface of specimen can reach to precise grinding standard. So cooling-air grinding can replace traditional grinding in this experiment. This study for the promotion of cooling-air grinding application technology has important significance for reference.

Abstract: In this paper, a copper-resin bonded diamond wheel was applied to machine the optical glass on a precision grinder. The process of truing and pre-dressing with ELID (electrolytic in-process dressing) were first carried out for the grinding wheels, then the ELID assisted grinding experiments were conducted with the special fine and coarse grained diamond wheels. The experimental results show that the fine and coarse grained wheels can all generated the smooth surface with the surface roughness in nanometer scale and the coarse grained diamond wheel correlates to the slightly more surface damage than the fine grained diamond wheel, which also proves that the high efficient grinding of the optical glass with a good surface quality can be realized with the coarse grained copper-resin wheel on a precision grinder and the grinding wheels were all well conditioned with the conditioning method presented in this paper.