1, aluminum extrusion mold heat treatment quality directly affects the service life of extrusion mold, mold after quenching is "+" multiple tempering hardness requirements. Quenching is in order to improve the mold hardness, tempering is many times in order to improve the mould toughness, stable internal organization. Mold heat treatment hardness value provisions:

Large aluminum extrusion dies (F > 500 mm), HRC45-48; Medium-sized mold (F300 ~ 500 mm), HRC47-50; Small extrusion dies (F < 300 mm), HRC48-51; In a set of mould with three plane detection, every bit of hardness value should be within the scope of the provisions is qualified.

2, pay special attention to in the process of extrusion die heat treatment:

A warming faster, high temperature section, heat preservation time is too long, in case of extrusion die burnt or overheating, overheating, coarse grains, burnt, low melting point elements and inclusion dissolve;

B, aluminum extrusion dies after quenching tempering in time, to prevent cracks;

C, extrusion die when they find the hardness is not enough or uneven hardness after heat treatment, should be annealed, according to a new heat treatment process of (when the hardness value < HRC35 don't annealing, direct heat treatment);

D, for large aluminum extrusion mold or finished product mould cavity complex should increase to stress tempering process (eliminate electric processing, mechanical stress, which is to eliminate the thermal stress and organization stress).

E, die quenching oil temperature should be? 100 ° C, in order to ensure the quenching effect.