The thickness of the aluminum tube is uneven

The thickness of the aluminum tube is uneven. The thickness of the aluminum tube is thick and thin in the cross section, which exceeds the deviation range specified by the standard. This is called uneven thickness.

The characteristic feature is that the thickness may be uneven in the same cross section or uneven in the longitudinal direction.

The main reason is that the wall thickness of the aluminum billet is uneven, which directly leads to the uneven thickness of the aluminum tube.

The gaps on both sides of the hole are inconsistent.

The feed volume is too large.

The hole gap is too large.

The hole type setting is unreasonable.

The bending of the core head can cause uneven thickness of the aluminum tube.

When the hole gap is inconsistent, the width of the two sides of the aluminum is different when it is rolled.

The thickness of the side with a larger hole gap is larger, and the thickness of the side with a smaller gap is smaller, resulting in uneven lateral thickness of the aluminum tube.

When the pre-finishing length of the hole is too small, the pre-finishing taper does not match the core head taper.

The hole type is seriously worn.

Or if the feed amount is too large, the longitudinal thickness of the aluminum tube will be uneven.

The longitudinal thickness of the aluminum tube is uneven, which may not exceed the deviation range specified in the relevant standards. However, due to the appearance of annular waves on the surface of the aluminum tube, serious surface defects will occur.

Preventive measures: select qualified aluminum billets,

Reasonably adjust the tube gap,

Don’t feed too much.

Reasonably adjust the core head taper,

Repair hole shape, core head size and surface in time.