RU2263014C1 - Method for producing sheets of aluminum and low-strength aluminum alloys having thickened cladding layer of high-strength aluminum alloys - Google Patents

Abstract

FIELD: manufacture of sheets of aluminum and low-strength aluminum alloys with thickened cladding of high-strength aluminum alloys.

SUBSTANCE: method comprises steps of separately heating before assembling pack, ingots of aluminum or low-strength aluminum alloys and aluminum-clad plane plates; heating ingots till temperature consisting 0.45 - 0.56 of melting temperature of aluminum and heating aluminum-clad plane plates till temperature consisting 0.72 - 0.76 of said temperature; rolling assembled two-layer or three-layer packs according of multi-pass schedule at deformation rate (0.02 - 0.4) 1/s and at reduction degree 5 - 10% during first three passes. The whole process is realized in industrial mills for hot rolling.

EFFECT: enlarged assortment of clad materials on base of aluminum or low-strength aluminum alloys having thickened cladding of high-strength aluminum alloys produced with use of hot rolling of packs.

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Description

The invention relates to the processing of metals by pressure and can be used for the manufacture of sheets of aluminum and low-strength aluminum alloys (AMC) with a thickened cladding of high-strength aluminum alloys (pre-eutectic and eutectic silumin, alloy AMg 6, B95, etc.) by rolling packaged ingots.

The known process of cladding ingots of aluminum alloys with aluminum of different thicknesses during hot rolling (V.K. Korol, M.S. Gildenngorn. Fundamentals of the technology of production of multilayer metals. M: Metallurgy, 1970, 236 pp.).

When cladding ingots of aluminum and low-strength alloys with high-strength aluminum alloys, the process is difficult due to cladding of the working rolls of the mill by cladding layers. Some stabilization of the cladding process is achieved, for example, by selecting the thickness of the clad tablet (see SU 1750896 A1, 07/30/1992 / 1 /), taken as a prototype. In the process of the method / 1 / carry out the assembly of the package and its hot rolling.

The method gives positive results when receiving sheets of alloy AMC with a limited thickness of the cladding layer of silumin. Therefore, the range of rolled products from aluminum ingots and low-strength aluminum alloys with thickened cladding (over 5%) from durable aluminum alloys is limited.

The expansion of the range of materials from aluminum and low-strength aluminum alloys with thickened cladding from strong aluminum alloys can be achieved by separately heating ingots of aluminum and low-strength alloys and a tablet from high-strength alloys pre-clad with aluminum, bag assembly and hot rolling.

The objective of the invention is the expansion of the range of clad materials based on aluminum and low-strength aluminum alloys with thickened cladding with durable aluminum alloys.

The problem is solved by preliminary cladding strong aluminum alloys with aluminum during hot rolling to obtain a tablet.

The ingots from aluminum and low-strength aluminum alloys and plates from strong alloys are separately heated before assembly of the bag. Ingots to a temperature of 0.45-0.56 of the melting temperature of aluminum, and clad plates of durable aluminum alloys to a temperature of 0.72-0.76 of the melting point of aluminum. The collected packages are rolled.

When the temperature of the aluminum ingots is below 0.45, the adhesion of the ingot material to the plate decreases at a temperature of more than 0.56, the plate detaches from the ingot and the mill rolls are wrapped. When the tablet temperature is below 0.72 melting points of aluminum, the adhesion of the tablet to the ingot material during rolling decreases.

At temperatures above 0.76, the tablet material overheats.

The assembled two- or three-layer package is rolled according to a multi-pass scheme with a deformation rate of 0.02-2.0 s ^-1 and compression of 5-10% in the first three passes.

When the strain rate is less than 0.02 s ^{-1, the} productivity of the rolling process decreases. At a speed of more than 2 s ^{-1, a} strong connection of the layers is not formed.

When the package is compressed, less than 5% of the strong connection of the layers does not occur, the tablet is detached from the ingot. When crimping over 10%, plating metal losses are formed due to increased unevenness of the layer-by-layer deformation of the package.

Rolled products from aluminum and low-strength aluminum alloys with thickened cladding with strong aluminum alloys are produced from ingots and tablets in industrial hot rolling mills.

Example

Milled aluminum ingots of A1 grade or AMC alloy and tablets of AMg6 or eutectic silumin alloy with technological cladding with aluminum were degreased with gasoline before separate heating.

1. To obtain rolled metal from aluminum or an alloy of AMC with double-sided cladding, ingots of size 25 × 120 × 200 and tablets 10 × 120 × 200 were heated to a temperature (0.45-0.56) of the melting temperature of aluminum, tablets from a durable alloy to (0 , 72-0.76).

Before rolling, three-layer and two-layer bags were collected. To form a strong connection of the layers, the package was deformed in a rolling mill with a diameter of work rolls of 240 mm. The compression in the first three passes was 5-10% in each at a strain rate of 0.02-2.0 s ^-1 .

Billets of aluminum and AMC alloy with thickened cladding from durable aluminum alloys were obtained.

Claims (1)

A method of producing clad sheets of aluminum or low alloy aluminum alloys, comprising assembling a package consisting of an aluminum ingot and at least one cladding blank of high strength aluminum alloy, and hot rolling, characterized in that the cladding blanks are pre-clad with aluminum, before assembling the package ingots of aluminum or low alloy alloys are heated to a temperature of 0.45-0.56 melting points of aluminum, and cladding billets are heated to a temperature of 0 , 72-0.76 melting points of aluminum, then the assembled two or three-layer package is rolled in a multi-pass scheme with a strain rate of 0.02-2.0 s ^-1 and compression of 5-10% in the first three passes.