Analysis of Reasons for Unqualified Mechanical Properties of Aluminum Materials
① When extruding aluminum profiles, the temperature is too low and the extrusion speed is too slow. The outlet temperature of the profile in the extruder cannot reach the solid solution temperature, which cannot achieve the solid solution strengthening effect;
② There are few fans at the outlet of the profile, resulting in insufficient air volume and slow cooling speed, which cannot lower the profile to below 200 ℃ in the shortest possible time. This leads to premature precipitation of coarse Mg2Si, reducing the solid solution phase and affecting the mechanical properties of the profile after heat treatment;
③ The composition of the ingot is unqualified, and the Mg and Si content in the ingot does not meet the standard requirements;
④ The uneven treatment of the ingot prevents the Mg2Si phase precipitated in the ingot structure from re dissolving in a short period of time during extrusion, resulting in insufficient solid solution and affecting product performance;
⑤ Improper aging process, poor hot air circulation, or incorrect installation position of thermocouples can result in insufficient or excessive aging.
Solution for Unqualified Mechanical Properties of Aluminum Materials
① Reasonably control the extrusion temperature and extrusion speed to maintain the outlet temperature of the profile above the minimum solution temperature of the extruder;
② Strengthen the air cooling conditions, and factories with conditions can install atomized cooling devices to meet the minimum requirements for the cooling gradient of 6063 alloy;
③ Strengthen the quality management of ingots;
④ Homogenize the ingot;
⑤ Reasonably determine the timeliness process, install thermocouples correctly, and place profiles correctly to ensure smooth hot air circulation. 3 geometric dimensions exceed the tolerance.
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