工具钢环形试件表面下人工孔在其表面产生的漏磁场

The Magnetic Leakage Field Yielded by a Subsurface Artificial Hole in the Tool Steel Ring Specimen over its Surface

用磁偶极子链概念分析了工具钢环形试件表面下的人工孔在直流周向磁化时,在其表面上产生漏磁场的原因、条件和规律。证明该漏磁场强度是环径、孔径、孔埋藏深度、周向磁化电流、钢环的饱和磁化电流及其磁化率等的多元函数。

The reason, condition and rule of the magnetic leakage field yielded by a subsurface artificial hole in the tool steel ring specimen over the ring surface at circular magnetization by direct current are analyzed in the present paper through the concept of magnetic dipole chain. It is proved that this magnetic leakagefield is a multivariant function of the ring diameters, the hole diameter, the buried depth of the hole, the circumferential magnetizing current, the saturated magnetizing current and the magnetic susceptibility of the steel ring etc.