论文部分内容阅读
深入探讨了ＴｉＮ涂层高速钢在边界润滑摩擦磨损状态下的特殊现象，并初步搞清楚ＴｉＮ涂层高速钢刀具在切削过程中的磨损机理．在含硫润滑剂作用下，ＴｉＮ涂层表面受化学腐蚀，电化学腐蚀磨损，而反应边界膜在摩擦副之间起到部分隔离金属直接接触，避免ＴｉＮ涂层发生机械摩擦磨损的作用；在切削过程中，在ＴｉＮ涂层高速钢刀具的刀－屑接触边界处ＴｉＮ与大气中的氧化合，生成有益的氧化钛，致使ＴｉＮ涂层刀具抗缺口磨损能力较强，但刀－屑接触长度减小，因而易发生刀尖磨损．
In-depth discussion of the TiN coated high-speed steel in the boundary lubrication under the state of friction and wear of the special phenomenon, and initially find out TiN-coated high-speed steel cutting tool in the wear mechanism. Under the action of sulfur-containing lubricant, the surface of TiN coating is chemically and electrochemically corroded, while the reaction boundary film plays a part of the isolated metal direct contact between the friction pairs to avoid the mechanical friction and wear of TiN coating. In the cutting process, TiN is oxidized with atmospheric oxygen at the knife-chip contact boundary of TiN coated HSS tool to generate beneficial titanium oxide, which makes the TiN coated tool more resistant to notch wear but the knife-chip contact length Reduce, so prone to tip wear.