SU423599A1 - METHOD OF MAKING GLACKED SHEETS FROM ALUMINUM ALLOYS - Google Patents

Description

I

The invention relates to the field of the production of clad metals.

A known method for producing clad sheets of aluminum alloys in which sheets are rolled out of an aluminum ingot and an aluminum alloy ingot is subjected to homogenizing annealing at 450-500 ° C for 6-24 hours and milled to a depth of 8-f-12 mm.

Then on the ingot of the alloy on both sides impose plates and the assembled package rolled to the desired thickness.

The disadvantage of this method is the appearance of gas defects (bubbles) on the surface of the sheets after their heat treatment. The occurrence of these defects is due to the hydrogen contained in the metal, which, when heated, is redistributed throughout the metal structure.

In order to increase the degree of degassing and eliminate gas defects in clad sheets according to the proposed method, in the process of rolling an aluminum aluminum ingot before final deformation, the workpiece is subjected to additional annealing at 500-550 ° C for 24-f-40 hours before homogenizing annealing.

The method is carried out as follows.

The aluminum ingot is rolled to a thickness exceeding the predetermined thickness of the plate by 5-f-lO mm, then the obtained billet is subjected to additional annealing at

 within one hour, removing from it at the same time up to 90% of hydrogen, and rolling up to a thickness of the plate.

The ingot of aluminum alloy is heated to 300-350 ° C for 2-4 hours and milled

to a depth of 8-f-12 mm on the side, removing liquation flows and surface roughness. After milling, the alloy ingot is subjected to homogenizing annealing. When this occurs, the removal of hydrogen from

surface layers of the ingot to a depth of mm. The homogenized ingot is again milled to a depth of mm to remove from the surface of the ingot an oxide film formed during the homogenization process. During secondary milling, most of the degraded surface layers are retained.

To obtain a clad sheet on

alloy ingot on both sides impose

aluminum tablets and manufactured joint

rolling an ingot with superimposed pa it tablets.

Subject invention

A method of manufacturing clad sheets of aluminum alloys, comprising the rolling of a flat aluminum ingot, the homogenizing annealing and milling of an aluminum alloy ingot, and the joint rolling of an aluminum alloy ingot with aluminum-5 tablets laid on it, characterized in that degassing and elimination of gas defects in clad sheets; in 4 rolling processes of ingot of aluminum plate, before final deformation, the workpiece is subjected to additional annealing at 500- r550 ° C for one hour, and the milling of an aluminum alloy ingot is left in front of a homogenized annealing.