7075 aluminum bar may crack in the center during production. What is the cause?Next 7075 aluminum bar manufacturers to give you a specific introduction.

1. Casting speed

When the casting speed is lower than the speed determined by the formula UxD=1m2/h, the tensile stress in the cold insulation can be avoided, thus avoiding the occurrence of thermal cracks.UX is the casting speed m/h, d is the diameter of the ingot m (m).

2. Correlation temperature

The melting temperature is 720-760, the highest is not more than 780, the refining temperature is 710-730, the casting temperature is generally 50-110 higher than the liquid line temperature of the alloy.The ambient temperature of casting is 705-725 or 700-720, generally not exceeding 730

The temperature of the water is usually controlled at 35 degrees, preferably not more than 40 degrees.Cooling a ton of aluminum water into a rod can raise 30 tons of water from 35 to 62 degrees.

Common defects in the quality of center cracks in 7075 aluminum bars during casting.In addition to the casting process, the presence of boron in the aluminum ingots can also cause the center of the enterprise and crack.In the production and life practice, 7075 aluminum bar quality management control system should include boron into the raw material aluminum ingots, the analysis of the chemical composition before furnace Chinese elements, the teaching quality safety monitoring of boron content data, is conducive to the improvement of 7075 aluminum bar quality cost control theoretical system.

The above is the cause analysis of 7075 aluminum bar center cracking. If 7075 aluminum bar is needed, please contact us.