Brief analysis of Surface Stripe knowledge of industrial aluminum profile processing manufacturers

Professional knowledge of stripes caused by processing surface layer of industrial aluminum profile: after each smooth mold operation and extrusion molding, the texture can not be corresponding one by one, light and heavy. In the whole process of extrusion molding, the moment when the profile is discharged from the die hole is firmly close to the working belt to form a pair of dry friction pairs under thermal conditions, and the working belt is divided into two areas - adhesive area and rolling area. In the adhesive region, the metal harmonic motion is subjected to forces from two layers: sliding friction and shear stress.

When the sliding friction force of the metal simple harmonic motion in the adhesive area exceeds the shear stress, the metal simple harmonic motion will adhere to the surface of the working belt in the adhesive area and scratch the surface of the profile to produce friction lines.

Adjust the inlet and outlet angle of die shell during operation α， Make it in the range of - 1 ° ~ - 3 °, which can reduce the height width ratio of the adhesive zone in operation, reduce the sliding friction in this zone and expand the rolling zone; Carry out mold shell nitriding treatment to maintain the surface strength of mold shell above hv900; The surface sulfurization can reduce the sliding friction and friction lines in the adhesive zone.

The ingot forging mechanism is uneven, the composition shrinks and loosens, there are serious shortcomings under the ingot skin, and the symmetry ratio of the ingot is not sufficiently solved. In the whole process of extrusion molding, the surface composition of the profile is uneven, which makes the coloring ability of the profile after air oxidation different, resulting in mechanism stripes. Effectively implement the forging process to clean or alleviate the shrinkage and looseness of the mechanism; Ingot surface skin; Carry out ingot homogenization carefully.

The products of aluminum profile manufacturers mainly show luminescence in air oxidized white materials. In most cases, they are straight strips with uncertain total width. In air oxidized dyes, the strips are light color strips. Because when the metal fluidity has strong friction or deformation, the temperature of the metal part will rise very high. In addition, the uneven metal fluidity will also cause strong crushing of the crystal, followed by work hardening, resulting in the change of the point mechanism. In the subsequent air oxidation solution, vertical bright stripes will occur on the surface of the molding material, In the coloring solution, the profile will not be colored or show light color stripes.

Effective design scheme and mold design; Pay attention to the connection of working belt in mold manufacturing to avoid fluctuation of working belt; Ensure that the mold bridge is pear shaped and clean the edges and corners.