Research On The Cutting Performance Of Novel Al₂O₃-based Ceramic Cutting Tools

Nuclear power is a clean, pollution-free energy for sustainable development and gets more and more attention from countries of the world. The key scientific issue of nuclear pump manufacturing has been listed as973projects in our country. It is the key to promote nuclear power automation. Based on the cleanliness and integrity surface machining requirements for the key components of nuclear main pump, summarying and studying traditional and non-traditional machining methods, in order to solve the problem of the existing cutting tools difficult to machining a high undefiled and integrated surface, two new Al2O3-based ceramic cutting tools are prepared, to do the research from the surface cleanliness, corrosion resistance, surface roughness analysis, the cutting temperature and cutting force, tool wear mechanism.First, based on the nuclear equipment manufacturing requirements,a non-contain metal-binding agents or pure ingredients Al2O3ceramic tool is prepared by selecting a reasonable formula and sintering process, The compact structure and mechanical properties are also discussed.Secondly, the comparation dry-turning of304austenitic stainless steel experiment is conducted among the new alumina-based ceramic cutting tools and traditional YG8hard alloy cutting tool, high-speed steel cutting tool, Ti (C, N) based on alumina, analyzing the surface cleanliness and integrity, the surface corrosion under nuclear environment is also studied. The results showed that compared with traditional tools, the novel A ceramic cutting tool have an obvious advantage in machined surface cleanliness, corrosion resistance and integrity.In addition, do on-line detection of the cutting temperature and cutting force, analyzing the variation law and the influencing factors, the results show that the new type of ceramic tool is more suitable for high-speed cutting, and in the stage of finishing and semi-finishing, the cutting temperature and cutting force of the new type of ceramic tool cutting304is far lower than the hard alloy cutting tools, in particular the novel A ceramic tool have an obvious advantage.Finally, the wear characteristics and wear mechanism of the dry cutting of the304austenitic stainless steel are analyzed, test results show that in the finishing stage, the novel A ceramic tool have the best wear resistance in the three type of cutting tools, a minor adhesive wear occurs on tool point of the novel A ceramic tool; novel B ceramic tool appear block chipping in the tool point because of its lower toughness and more severe adhesive wear happened on the hard alloy cutting tool.