The main points of heat treatment of aluminum extrusion die

1. The quality of heat treatment of aluminum extrusion die directly affects the service life of the extrusion die. The die is quenched and tempered "+" multiple times to meet the hardness requirements.

   Quenching is to improve the hardness of the mold, and multiple tempering is to improve the toughness of the mold and stabilize the internal structure. The hardness value of each point detected on the same plane of a set of molds should be within the specified range to be considered qualified.

   
   

2. Special attention should be paid to the following points during the heat treatment of the extrusion die:

a. The heating rate in the high temperature section should be fast, and the holding time should not be too long to prevent the extrusion die from being overburned or overheated, the overheated grains are coarse, and the over burned lowmelting point elements and inclusions will dissolve;

b. The aluminum extrusion die should be tempered in time after quenching to prevent cracks;

c. When the hardness of the extrusion die is found to be insufficient or uneven after heat treatment, annealing should be carried out, and the heat treatment should be carried out again according to the process .when the hardness value is less than HRC35, it may not be annealed, and the heat treatment should be carried out directly;

d. A stress relief tempering process should be added to large aluminum extrusion dies or finished molds with complex cavities .eliminating electrical machining and machining stress, that is, eliminating thermal stress and tissue stress;

e. The temperature of the mold quenching oil should be 100°C to ensure the quenching effect