Usually the use of precision tube are directly, but sometimes may be on the bending process, if ordinary precision tube wall thickness thinner cases have a plenty of can directly bending or other processing, but if the larger wall thickness is not suitable for direct to bend and so on a series of mechanical processing, the precision of this kind of circumstance to bend light pipe must be annealing processing before processing.

Annealing is a kind of metal heat treatment process, the primary method of annealing process is the metal slowly heated to a certain temperature and keep a long enough period of time again at the speed of suitable for cooling. Purpose is to reduce the hardness of the metal, strengthen the cutting performance of the metal, eliminate the residual stress inside the metal, stable size, reduce the deformation and crack tendency, refine the grain size, adjust the organization, eliminate the tissue defects.

Annealing is completed, we can directly on steel pipe or bending machining processing technology so as to solve the steel pipe for cracking occurs in the process.