How to identify the quality of casting billets

Casting billets quality identifing

As the requirement for aluminum profile from the customers is getting higher and higher, aluminum billets materials play important role in extrusion quality.

To ensure the quality of aluminum materials, we must first ensure the quality of aluminum billet.

Today, we will talk about how to identify the quality of casting billets.

1.Appearance

From the surface, a good quality aluminum billet has a smooth surface, no oil, no scratches and no black spots.

If the surface is dark or not clean, consider whether it is a recycled aluminum materials production or equipment problem, and if there are spots or scratches.

Consider whether the aluminum billets are stored for a longer period of time.

It should be free from inclusions, bubbles, or spots of corrosion.

The cinch marks, layering, and shrinkage depths are less than 0.5% of the billet diameter.

The metal edge is less than 0.2% of the billet diameter.

2.Size

As far as billet shape is concerned, a good quality aluminum billet has a good straightness, and a poor-quality aluminum billet has a curved straightness, and the bending degree is not more than 3 mm per meter.

The full length of the bending according to the billet diameter must not exceed 10-15 mm.

The tolerance of the diameter is also very important, and the tolerance of the diameter of the billet should not exceed 2-5mm.

3. Chemical composition

Big companies basically have spectrometers that can quickly detect aluminum billet components.

Small companies can actually be equipped with chemical analysis equipment.

However, the requirements for operator are high, but the analysis accuracy is higher than that of the spectrometer.

The chemical composition is controlled according to the type of alloy.

4. Macrostructure

4.1. Cracks, blow hole, and white spots are not allowed in the billets.

4.2 Feather crystal, according to the requirements of the profile, the minimum level feather crystal area is less than 30% of the aluminum billet area, the highest level is not allowed in the billets.

4.3 Slag inclusion: The highest level is not allowed, the minimum level is no more than 2 points, and each point is less than 0.5mm.

4.4 Bright grain: The highest level is not allowed in the billets; the minimum level is 1-10 points according to the size.

4.5 Grain size and loosen, inspect by grade.

4.6 Compound: The highest level is not allowed in the billets, the minimum level is no more than 5 points, and each point is less than 5mm.

5.Microstructure

It is mainly tested that the aluminum billet after homogenization should not have a burnt phenomenon.

Brightstar Aluminum Machinery provides aluminum billet cutting solution for our customers, not only aluminum billet multi billets cutting system, but also aluminum billet single billet cutting system.

The machine is made up by loading rack, conveying roller, saw table, pressing framework, cut to length framework, discharging framework, hydraulic station and electrical control system Etc parts.

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How to identify the quality of casting billets