When we drive for a long time, many auto parts need to be checked for cracks. If we don't find them in time during the car repair, they will be damaged and cause serious accidents. How to detect the crack of auto parts in Jinan BMW special repair?

　　部分裂纹的检测方法包括磁力检测、荧光检测和气溶胶检测。对水冷缸体和缸盖铸件用液压试验方法进行了裂纹检测。在某些轴类零件的表面也可以通过出油的方法发现隐藏的裂纹。

　　Some crack detection methods include magnetic detection, fluorescence detection and aerosol detection. The crack detection of water-cooled cylinder block and cylinder head casting by hydraulic test method was carried out. The hidden cracks can also be found on the surface of some shaft parts by the method of oil discharge.

　　磁力探伤。磁力探伤法具有设备简单、测量准确、快速等优点。

　　Magnetic flaw detection. The magnetic flaw detection method has the advantages of simple equipment, accurate measurement, fast and so on.

　　磁探伤的原理是当磁力线通过被检零件时，零件被磁化。如果零件表面有裂纹，裂纹部位的磁力线会因为裂纹本身不具有磁性而中断，从而使磁力线偏移而形成磁极。此时，磁性铁粉或铁粉液体被移出零件表面，铁粉被磁化吸附在裂纹内，从而显示出裂纹的位置和大小。当裂纹方向与磁场方向平行时，裂纹所切割的磁力线数较少，裂纹两侧不会出现磁极，铁粉无法被吸收。因此，利用磁力检测裂纹时，裂纹必须与磁场方向垂直。因此，在检测时，要估计出裂纹可能发生的位置和方向，并使用不同的磁化方法:横向裂纹使零件纵向磁化，纵向裂纹使零件横向磁化(或环形磁化)。

　　The principle of magnetic flaw detection is that when the magnetic line of force passes through the inspected part, the part is magnetized. If there is a crack on the surface of the part, the magnetic field line at the crack will be interrupted because the crack itself is not magnetic, so that the magnetic field line will shift and form a magnetic pole. At this time, the magnetic iron powder or liquid iron powder is removed from the surface of the part, and the iron powder is magnetized and adsorbed in the crack, thus showing the location and size of the crack. When the direction of the crack is parallel to the direction of the magnetic field, the number of magnetic lines cut by the crack is small, the magnetic poles will not appear on both sides of the crack, and the iron powder cannot be absorbed. Therefore, the crack must be perpendicular to the direction of magnetic field. Therefore, in the detection, it is necessary to estimate the possible location and direction of cracks, and use different magnetization methods: transverse cracks magnetize the parts longitudinally, and longitudinal cracks magnetize the parts transversely (or circularly).

　　以上就是济南宝马汽车专修介绍的检测汽车零部件裂纹的相关方法，希望对您有所帮助!如果您有更多的信息，请随时与我们联系。

　　The above is the relevant method of detecting the crack of auto parts introduced by Jinan BMW special repair. I hope it can help you! If you have more information, please feel free to contact us.