| Aluminum / magnesium / aluminum bimetallic plate is a new type of composite laminate with excellent performance of magnesium alloy and aluminum alloy. AZ31 magnesium alloy has high specific strength and good shock resistance, 5052 is a rust-proof aluminum alloy with moderate intensity. 5052 / AZ31 / 5052 bimetallic laminate plate are the physical contact between the plate, do not form a brittle compound. In order to make the aluminum / magnesium / aluminum bimetal plate can be widely used in industrial production, we must study its formability further.This paper researches the deep drawing process of the double metal laminated sheet by warm deep drawing test and finite element numerical simulation. The purpose of this study aims to explore the influence of the different drawing process parameters on the deep drawing performance of the bimetallic plate, and obtain the reasonable molding process parameters.Since the supply of 5052 aluminum alloy plate to a hardened state, its poor ductility, it is first annealed 5052 aluminum alloy plate. By analyzing the sheet mechanical properties, microstructure and formability, we determine the optimum annealing process parameters. The results showed that: after an annealing temperature of 340℃, 1 h incubation, Sheet tensile strength was 181.3 MPa, elongation of 22.36%, cupping value of 7.59 mm, the drawing sheet meet the needs of plastic deformation.Secondly, the warm drawing die is used to the drawing test of the 5052 / AZ31 / 5052 bimetallic plate, and explore the influence of process parameters to the forming properties of 5052 / AZ31 / 5052 laminate plate, including the die radius, forming temperature, thickness, inner and outer layers of different thickness, etc., and analyze the microstructure and the thickness distribution of the different parts of the forming cylinder-shaped part.Though the test, obtained conclusions are as follow: in the 140℃ ~ 230℃ forming temperature range, the trend of the limit drawing ratio(LDR) of the bimetal laminated of plates was first increase and then decrease with temperature increasing, LDR achieved maximum 2.63 at 200℃. The number of wrinkle of the laminate was the least, and the wrinkle height was the lowest at 200℃. When the forming temperature is 200℃, the microstructure of the cylindrical wall region, the punch radius region, and the bottom area of the cylinder were homogeneous and the grains were mainly dynamically recrystallized. With the increase of the thickness of the bimetal sheet, the drawing force increased; the wall thickness of the cylindrical member were measured with microscope in the rolling direction(RD) and perpendicular to the rolling direction(TD), we obtained that the punch radius region was the most easily thinned part; the cylindrical mouth portion of the intermediate layer member of the magnesium alloy plate was obviously thickened, the thickness of the inner and outer layer of aluminum alloy sheet was reduced; the wall thickness reduction rate of 5052 aluminum alloy changed greatly; the variation of thickness in RD direction was greater. When the 5052 / AZ31 / 5052 bimetallic plate with different thickness of inner and outer layers was drawn, when the inner plate was thin, it is beneficial to the forming of the bimetallic plate.The DYNAFORM software was used to simulate the deep drawing process of the bimetallic plate at 200℃, though the comparative analysis of the simulation results with the actual results, we found that: the shape and the wall thickness distribution trends of the cylindrical member which the numerical simulation results showed were in good agreement with the experimental result. |
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