Aluminium alloy sheet mould pressing quenching composite molding method and integrated device thereof

Abstract

The invention discloses an aluminium alloy sheet mould pressing quenching composite molding method and an integrated device thereof. The method comprises the steps of heating a slab type blank holder, and cooling a female die and a male die; conducting solution heat treatment on an aluminium alloy sheet in a heating furnace; then conveying the aluminium alloy sheet subjected to solid solution and heat preservation from the heating furnace to the blank holder to be place in a centring mode, and ensuring that the sheet is still in a high-temperature state before molding; then conducting die assembly, completing the cooling and quenching process when aluminium alloy parts are in a die assembly state, and ensuring that the shapes of the parts do not change during quenching; conducting die sinking, wherein the aluminium alloy parts and the blank holder demould from the male die synchronously, taking out molding parts, fast moving the molding parts to the aluminium alloy sheet subjected to solid solution and heat preservation according to beats, and finally performing enhanced treatment on the aluminium alloy parts to obtain the final aluminium alloy parts. According to the aluminium alloy sheet mould pressing quenching composite molding method and the integrated device thereof, inverted female and male dies and a composite die are adopted, and the method is applicable to the preparation of aluminium alloy sheet parts capable of being subjected to heat treatment.

Description

technical field [0001] The invention relates to a metal material pressure processing process and its device, in particular to a metal material cold die quenching thermoforming method and its device, which are applied in the technical fields of plate forming and continuous forming. Background technique [0002] In order to cope with the energy crisis and meet the rapid development needs of the automotive field, advanced manufacturing technologies such as lightweight parts have become the focus of attention in the field of manufacturing and processing. One way to reduce weight is to use a new design concept, optimize the design, simplify the structure, reduce weight, and achieve lightweight structure; another effective way is to use lightweight materials with small specific gravity to achieve lightweight materials, such as high-strength steel , aluminum-magnesium alloys and carbon fibers are widely used in the automobile manufacturing industry. Compared with traditional steel...

AI Technical Summary

Problems solved by technology

The main alloying element of 7000 series aluminum alloy is zinc, which can obtain high strength, good corrosion resistance and good welding performance through proper heat treatment process, but its plasticity is low

However, there are two problems in this cold forming method: first, the poor formability of the aluminum alloy sheet at room temperature will cause cracking defects in the formed parts with complex shapes during cold forming, so the forming efficiency is low; second, the parts are taken out after forming. During the solid solution and aging T6 treatment process, since the parts need solution heating, quenching and cooling, deformation and springback are prone to occur due to thermal stress, resulting in poor dimensional accuracy of the parts

However, there are the following problems during molding: first, the method requires that the aluminum alloy part after forming must be separated from the die quickly along with the punch and the blank holder and stay on the blank holder and the punch to complete its cooling and quenching. In the process, since the parts have been separated from the punch and die, the parts are in a free unclamped state, which cannot solve the springback problem of the parts caused by the quenching stress, resulting in low matching accuracy of the parts after quenching, and a significant increase in the failure rate

Second, this method needs to place the plate on the die and heat it to the forming temperature. During the entire forming process, heating the plate and the mold takes up most of the time, resulting in low forming efficiency, which is not suitable for industrial continuous production; The concave mold with critical shape accuracy is heated to above 500 degrees Celsius required for solid solution, which will lead to a serious drop in mold accuracy, a serious drop in surface accuracy, and further reduce part accuracy

[0006] In summary, the existing thermoforming methods for aluminum alloy sheets have low forming efficiency and are prone to technical problems such as local wrinkling, cracking and springback, and cannot be applied to the needs of large-scale industrial production of aluminum alloy sheets.

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