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Thermal molding method of high-strength aluminum alloy sheet

A technology of aluminum alloy sheet and thermoforming, which is applied in the field of forming of aluminum alloy sheet components, can solve the problems of restricting wide application, complex process path, high equipment cost, etc., achieve high forming quality, increase drawing limit, and enhance bearing capacity Effect

Active Publication Date: 2016-10-26
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high cost of equipment and complicated process paths required for hydroforming and inflation forming under high temperature and pressure greatly limit their wide application in industrial production.

Method used

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  • Thermal molding method of high-strength aluminum alloy sheet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The back pressure head 9 moves to the set position, and the lower barrel 8 is filled with the heat-insulating granular medium 7, which is prepared from asbestos powder and expanded perlite products in a volume ratio of 1:1, and the average diameter of the granular body is It is 0.2mm to 0.4mm, has good fluidity, thermal conductivity is not more than 0.15W / (m·K), can maintain stable strength and hardness in the range of 0°C to 700°C, and has stable mechanical and chemical properties. In the heating furnace, heat the AA7075 aluminum alloy plate 5 to 480°C and keep it warm for 30 minutes; the upper and lower pressure edge rings 4 and 12 of the mold are heated to 480°C with the resistance heating device 6 provided, and the closed-loop temperature control system is used to keep the temperature constant. The edge ring is separated from other parts of the mold by the upper and lower heat insulation boards 3 and 11; the heated high-temperature plate is quickly moved to the heate...

Embodiment 2

[0025] The back pressure head 9 moves to the set position, and the lower barrel 8 is filled with the heat-insulating granular medium 7, which is prepared from asbestos powder and expanded perlite products in a volume ratio of 1:1, and the average diameter of the granular body is It is 0.2mm to 0.4mm, has good fluidity, thermal conductivity is not more than 0.15W / (m·K), can maintain stable strength and hardness in the range of 0°C to 700°C, and has stable mechanical and chemical properties. In the heating furnace, heat the AA6061 aluminum alloy plate 5 to 560°C and keep it warm for 30 minutes; the upper and lower pressure rings 4 and 12 of the mold are heated to 560°C with the resistance heating device 6 provided, and the closed-loop temperature control system is used to keep the temperature constant. The edge ring is separated from other parts of the mold by the upper and lower heat insulation boards 3 and 11; the heated high-temperature plate is quickly moved to the heated upp...

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Abstract

The invention discloses a thermal molding method of a high-strength aluminum alloy sheet. The thermal molding method is mainly characterized by comprising the steps of placing a thermal-insulated granular medium into a charging barrel; heating an aluminum alloy sheet to a temperature which is 10-20 DEG C higher than the melting point of an eutecticum; heating an upper blank holder and a lower blank holder of a mold, keeping the temperatures of the upper blank holder and the lower blank holder of the mold consistent with the heating temperature of the aluminum alloy sheet, then, rapidly moving the heated high-temperature sheet into the heated upper blank holder and lower blank holder of the mold, rapidly closing the mold to keep the temperature, and applying a blank holder force by a blank holder slide; loading the thermal-insulated granular medium through a backpressure head; and pressing a cooling male mold to take a combined action with the thermal-insulated granular medium of a soft female mold, and after finishing molding, rapidly transferring a workpiece by clamping to 20-60 DEG C water for quenching treatment. According to the thermal molding method, thermal treatment of the aluminum alloy sheet and a flexible molding technology realized by using the soft female mold are combined by virtue of the characteristic of the thermal-insulated granular medium, and the differential temperature molding process of the sheet is realized through the synergic effect of the cooling male mold, the thermal-insulated granular medium and the high-temperature blank holders, so that the molding property of the sheet can be effectively improved; and the thermal molding method has the characteristics of high molding quality, convenience in realization, low equipment requirement and the like.

Description

technical field [0001] The invention relates to a forming method of an aluminum alloy plate component. Background technique [0002] Energy saving and emission reduction is one of the leading directions of industrial development at present. In order to achieve this goal, it is an effective means to replace traditional carbon steel alloy materials with light alloy materials to achieve lightweight components. Aluminum alloy is one of the most widely used lightweight alloy materials. Its low density, high strength, high hardness and other high-quality properties make it the first choice for lightweight components. The specific strength value of aluminum alloy thin shell components exceeds that of many alloy steels, coupled with its excellent electrical conductivity, thermal conductivity and corrosion resistance, there are many application requirements in machinery manufacturing, transportation machinery, power machinery and aviation industry. However, the aluminum alloy sheet...

Claims

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Application Information

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IPC IPC(8): B21D22/20C22F1/04
CPCB21D22/201B21D22/208C22F1/002C22F1/04
Inventor 董国疆赵长财杨卓云
Owner YANSHAN UNIV
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