Aluminum alloy heat treatment and quenching process

1. Aluminum alloy heat treatment process. The purpose of this process is to make a large amount of usable hardening elements, such as copper, magnesium, zinc or more dissolved solids, into a solid solution, which must be maintained at a high temperature between 535 degrees and 550 degrees for a long enough time 6- 8 hours to obtain a more homogeneous solid solution.

2. The solid solution temperature of the aluminum alloy, the solid solution point of the aluminum alloy rim is 530 degrees, and the dissolution point is 555 degrees. Above this temperature, it begins to melt and turn into aluminum water. The main points of the heat treatment process of aluminum alloy: A. When heating up, the cooling water of the windmill is first turned on and smooth, and then the windmill is fully opened to run the temperature setting. During treatment)) B. Solution aging treatment conditions 545 degrees * 8H + 130 degrees * 6H The temperature must be stable and average temperature, which is determined according to the design strength, material, characteristics and testing of the rim. C. The quenching water temperature is 60 degrees - 80 degrees water temperature, the castings are not easily deformed, the quenching time is counted from the door, and the uppermost casting is fully soaked to the water, and the time is 16 seconds - 20 seconds to complete the instant quenching Water is best-best. D. Full inspection items after solution treatment, deformation inspection, shaping, and steel lettering to prevent abnormal tracking. After aging, test the hardness of one casting on the upper and lower layers of each car, and the value is 65-75HB. The continuous automatic operation is the same as the high temperature operation. The furnace is put into the furnace after being released in advance, and the operation is scheduled to enter and leave the furnace according to the time set by the timer.

3. Aluminum alloy quenching delay process. During quenching, when the casting is taken out from the solution temperature in the furnace to the time before quenching, the time elapsed is the quenching delay, and the quenching delay is 15 seconds > 18 seconds is the best. The most commonly used quenching liquid is water, and the rest are air or liquid nitrogen, etc., but the stress and distortion caused by quenching need to be considered, and sometimes hot water is required to prevent deformation and rupture.

4. When the heat-treatable aluminum alloy is quenched to normal temperature by precipitation hardening treatment, the solubility of solute at low temperature is low, resulting in a saturated and unstable state, so some structures will be precipitated in the base, and the precipitation effect at room temperature is Natural aging, if it needs to be heated to a certain temperature, it is artificial aging.