我厂在学习宜昌纺织机械厂经验的基础上,试制成功一台磁性比较仪,大大地提高了检验速度,现己应用于生产。一、简单原理根据黑色金属具有导磁性,金属内部组织结构不同导磁系数不同又有规律的特性(在弱磁场中磁感应强度对硬度、组织在一定的范围内成线性关系),例如,一般合金钢淬火硬度愈高,其导磁系数愈低,磁感应强度也愈低,感应电流愈小;反之淬火中出现非马氏体组织 I plant in Yichang Textile Machinery Factory learning experience, based on trial success of a magnetic comparator, greatly improving the speed of testing, is now used in production. First, the simple principle According to the ferromagnetic ferromagnetic metal, the internal structure of the metal with different permeability and regularity of different characteristics (magnetic field strength in the weak magnetic field, the organization in a certain range of linear relationship), for example, the general alloy The higher the hardness of steel quenching, the lower the permeability coefficient, the lower the magnetic flux density, the smaller the induction current; on the contrary quenching non-martensite