Essentials of Heat Treatment for Aluminum Profile Extrusion Dies and Analysis of Die Steel Design

[China Aluminum Industry Net] In recent years, with the rapid advancement of large-scale infrastructure investment and industrialization in China, the output and consumption of aluminum profiles have increased rapidly, and China has also become the largest aluminum production in the world. Base and consumer market. After nearly 10 years of rapid growth, China's aluminum industry has entered a new stage of development, and shows many new trends

Moreover, with the rapid development of industries such as construction, transportation, automobiles, and solar and LED industries, the requirements for high-precision and high-performance aluminum alloy extruded products are increasing, and the cross-sectional shape of the profiles is becoming more complicated and diversified, and the conventional common forms are designed. There are many deficiencies. Therefore, in order to obtain high-quality profiles, it is necessary to constantly learn and accumulate, constantly reform and innovate in production and life.

The heat treatment quality of the aluminum extrusion die directly affects the service life of the extrusion die. The die is quenched and tempered for several times to reach the required hardness. Quenching is used to increase the hardness of the mold. Multiple tempering is used to increase the mold toughness and stabilize the internal structure. Large aluminum profile molds (f>500mm), hrc45-48; medium molds (f300~500mm), hrc47-50; small extrusion dies (f<300mm), hrc48-51; three in the same plane of a mold The point, each point of the hardness value should be calculated within the prescribed range.

During the heat treatment of the extrusion die, special attention must be paid to:

a, high temperature section heating rate faster, the holding time can not be too long to prevent the extrusion mold has been burned or overheated, overheating - grain coarse, over-burning - low melting point elements and inclusions dissolved;

b. Temporarily temper the aluminum extrusion die after quenching to prevent cracking.

c. When the hardness of the extrusion mold is found to be insufficient or the hardness is not uniform, it shall be annealed and re-heated according to the process (When the hardness value d, the large-scale aluminum extrusion mold or the complex finished mold should be increased once to stress Fire process (eliminates electrical machining, machining stress, ie eliminating thermal stress and tissue stress);

e, mold quenching oil temperature should be 100 ° c, to ensure quenching effect.