Glass bottle mold organization before heat treatment

Poor before the mold heat treatment group

mould spheroidizing eventually organization bulky inequalities, imperfect spheroidizing, organizations have mesh, belt and chain carbide, this will make the mold after quenching cracks easily, cause mould scrap.

( 1) Reasons for

1) Die steel raw material have serious carbide segregation.

2) Forging process, such as forging heating temperature is too high, small deformation, slow stop forging temperature is high, the cooling speed after forging, etc. , make forging organization bulky and mesh, belt and chain carbide exists, the spheroidizing annealing is difficult to eliminate.

3) Spheroidizing annealing process, such as annealing temperature too high or too low, the isothermal annealing time is short, etc. , can result in uneven spheroidizing annealing organization or bad nodulizing.

( 2) Preventive measures

1) General should be based on the mould working conditions, the production batch and material itself strong performance, try to choose the steel material with good quality.

2) Improve the forging process or use prepare normalizing heat treatment, to eliminate the raw material in the mesh and chain inhomogeneity of carbide and carbide.

3) Carbide segregation of to forging serious high carbon steel refine solid solution heat treatment can be performed.

4) After forging die blanks, formulate correct spheroidizing annealing process specification, tempering heat treatment can be used well and rapid spheroidizing annealing.

5) Reasonable furnace charging, ensure the mold billet in the furnace temperature uniformity.