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 hardening elements that can be used, such as copper, magnesium, zinc, or polydissolved solids, into a solid melt, which must be kept at a high temperature of 535 degrees to 550 degrees for a long enough time. 8 hours, and obtain a more homogeneous solid solution. 1. Aluminum alloy solid solution temperature, aluminum alloy rim solid solution state point is 530 degrees, the melting point is 555 degrees, beyond this temperature begins to melt into aluminum water。

Main points of aluminum alloy heat treatment process:

A.When warming up, first turn on the windmill cooling water first, then turn on the windmill fully to set the operating temperature and combustion status

When entering the furnace (the casting is placed with the A side facing up, and the A side is forbidden (during solution treatment))

B.Solid solution aging treatment conditions 545 degrees * 8H + 130 degrees * 6H The temperature must be stable and uniform, according to the design strength of the rim、

Material, characteristics, testing decision。

C.The quenching water temperature is 60 degrees-80 degrees water temperature, the casting is not easy to deform, and the quenching time is counted from the door to

The uppermost casting is fully soaked in water, and the time is 16 seconds to 20 seconds to complete the instant quenching water。

D.Full inspection items after solution treatment, deformation inspection, reshaping, steel characters to prevent abnormal quality tracking, every time after aging

The hardness of one casting is measured on the upper and lower layers of the trolley, the value is 65-75HB. Cooperating with continuous automatic operation is the same as high temperature operation, enter the furnace after the furnace is pre-fired, and enter and exit the furnace regularly according to the time set by the timer。

2、Delaying process of aluminum alloy quenching water。

When quenching water, the casting is taken from the solution temperature in the furnace to the quenching water. The time it takes is the delay of quenching water. The delay of quenching water is 15 seconds> 18 seconds. The most commonly used quenching liquid is water, and the rest is air or liquid nitrogen, etc., but the stress and distortion caused by quenching should be considered. Sometimes hot water is needed to prevent deformation and cracking. 5. Precipitation hardening When heat-treatable aluminum alloy is quenched to normal temperature, due to the low solubility of solute at low temperature, it produces a saturated and unstable state, so some tissues will precipitate in the base, and the precipitation effect at room temperature is Natural aging, if it needs to be heated to a certain temperature, the precipitation is artificial aging。