渗镍高速工具钢／砂带基材的摩擦磨损实验研究

Research on Wear Failure Mechanism of HSS Nickel-coated Against Abrasive Belt Backing

为探究共轭接触轮/砂带基材之间的磨损失效机理,有效减缓共轭轮的磨损程度,在自行设计的砂带摩擦磨损实验台架上,进行了渗镍高速工具钢与砂带基材的配对磨擦磨损实验。通过分阶段观测渗镍高速工具钢实验轮表面粗糙度和表面形貌,揭示出粘着磨损机理占主导,疲劳磨损和氧化磨损机理其次,磨粒磨损机理比重最小;其次通过分阶段测定实验轮质量、几何尺寸等参数变化规律,计算出其磨损率比渗镍前至少下降约57%。研究表明:表面渗镍能有效提高普通高速工具钢共轭接触轮材料的耐磨性,从而能够提高共轭砂带磨床的磨削效率和加工精度。

The friction and wear experiment of high speed tool steel （HSS） nickel-coated against abrasive belt backing was performed on the testing rig, in order to determine the wear mechanism and reduce the wear rate of conjugate contact wheel effectively. The variation of surface roughness and surface topography of the experiment wheel were measured step by step and the wear mechanism was revealed as that adhesive wear dominated, followed by oxidation wear and fatigue wear, and abrasive wear was obsevered only occasionally. The wear rate of the experiment wheel reduced at least 57% compared with that of the uncoated wheel which was estimated through measuring the variation of the weight and diameter. The investigation shows that the nickel-coating on HSS can improve the wear-resistance of the conjugate contact wheel effectively, which can improve the efficiency and accuracy of abrasive belt grinding machine.