Shearing and coiling of aluminum alloys

Finishing refers to the processing and finishing of the geometric dimensions and surface quality of aluminum sheets and aluminum coils after rolling or heat treatment before they are processed into finished products.
It includes shearing straightening pickling, and finished product inspection.

Shearing quality includes width accuracy, burrs, skirts, knife marks and other quality requirements.
The main factors affecting shearing quality are tool quality, knife matching process, equipment condition, and incoming material quality.
Tool quality mainly includes the dimensional accuracy, surface condition, surface roughness, surface hardness, edge condition, and specification matching of blades, isolation sleeves and gaskets.
Low dimensional accuracy and incompatible specifications will cause the knife matching gap to be uncontrollable, thereby affecting the width accuracy of aluminum sheets and aluminum coils and causing burrs, skirts, knife marks, scratches and other quality defects. If
the blade edge is in poor condition, damaged and burred, it will cause burrs and uneven edges on the edges of aluminum sheets and aluminum coils.
Knife matching process mainly refers to the selection and matching of tools to achieve the control of horizontal gaps, vertical gaps, and width accuracy of aluminum sheets and aluminum coils.
If the horizontal gap is appropriate, the cross-section of the aluminum plate and aluminum coil cut out is smooth and straight, the boundary between the shear surface and the matte tear plane is straight, and the outer boundary line between the shear surface and the matte tear plane is straight and flush with the material surface.
If the horizontal gap is too small, the cross-section of the aluminum plate and aluminum coil cut out is smooth and straight, the boundary between the shear surface and the matte tear plane is curved, and the outer boundary line between the shear surface and the matte tear plane is straight and flush with the material surface.
The equipment load is large during shearing, which is easy to damage the blade. If the horizontal gap is too large, the cross-section of the edge of the cut product is smooth and straight, the boundary between the shear surface and the matte tear plane is curved, and the outer boundary line between the shear surface and the matte tear plane is curved, and burrs are generated on the boundary of the matte tear plane.
The horizontal gap should generally be 5% to 10% of the thickness of the aluminum plate and aluminum coil.

According to the product quality requirements and the quality of the incoming materials, choose blades of different forms, different inclinations, and different widths.
When shearing externally, the matching relationship between the outer diameter of the isolation ring and the outer diameter of the blade is that
the outer diameter of the isolation ring should be greater than or equal to the outer diameter of the blade.
When the thickness of the aluminum sheet and aluminum coil is less than 0.3 mm, the outer diameter of the isolation ring is equal to the outer diameter of the blade plus 0.49 mm. When the thickness of the aluminum sheet
and aluminum coil is greater than 0.3 mm, the outer diameter
of the isolation ring is equal to the outer diameter of the blade. During internal shearing, the matching relationship between the outer diameter of the isolation ring and the outer diameter of the blade is that the outer diameter of the isolation ring is smaller than the outer diameter of the blade.

The coiling quality mainly refers to the quality of the rear end surface of the aluminum coil after winding, which will mainly be affected by tower-shaped, staggered and bird's nest-shaped defects. The
main factors of curling quality are curling tension, configuration of separation discs, paper core strength, centering mechanism and incoming material conditions.
The surface quality is mainly
the depressions and protrusions on the main roller surface, and foreign matter adheres to the roller surface, which produces marks, scratches and oil stains on the surface of the aluminum coil.
Second, improper selection of tension pads and improper production processes cause scratches on the aluminum surface. Oil stains and aluminum powder accumulation.
Third, the tension between the unwinder and the coiler is improper, resulting in scratches between the aluminum layers.