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Heat treatment method for improving hot punching moldability of 7075 aluminum alloy

A heat treatment method and hot stamping forming technology are applied in the field of plastic forming processing of metal materials to achieve the effect of improving thinning rate and thickness uniformity

Inactive Publication Date: 2018-02-13
UNIV OF SCI & TECH BEIJING
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  • Description
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Problems solved by technology

However, this process requires the initial forming temperature of the sheet to be slightly lower than the solid solution temperature, rather than the optimal forming temperature range of the material

Method used

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  • Heat treatment method for improving hot punching moldability of 7075 aluminum alloy
  • Heat treatment method for improving hot punching moldability of 7075 aluminum alloy
  • Heat treatment method for improving hot punching moldability of 7075 aluminum alloy

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Experimental program
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Embodiment 1

[0024] The effect of deformation temperature on the plastic elongation of 7075 aluminum alloy material was studied by experiments. The experimental conditions were as follows: the 7075 aluminum alloy sheet with a thickness of 2 mm was subjected to solution treatment, the solution temperature was 480 ° C, and the solution time was 10 minutes. Cool the sheet after solid solution to different temperatures (300°C, 350°C, 400°C, 450°C) at a cooling rate of 50°C / s, and at different strain rates (0.01s -1 , 0.1s -1 、1s -1 and 10s -1 ) for isothermal stretching to obtain the effect of deformation temperature on the plastic elongation of the material, such as image 3 As shown, the 7075 aluminum alloy sheet has the best plastic elongation at 400 °C.

[0025] The effect of cooling rate on the tensile strength of 7075 aluminum alloy material was studied by experiments. The experimental conditions were: the 7075 aluminum alloy sheet with a thickness of 2 mm was subjected to solution tr...

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Abstract

The invention mainly belongs to the field of plastic molding machining of metal materials and particularly relates to a heat treatment method for improving the hot punching moldability of 7075 aluminum alloy. The heat treatment method comprises the steps of solution treatment, cold mould molding, pressure-retaining quenching and ageing. The heat treatment method further comprises the step of sheetmetal forced cooling performed between the step of solution treatment and the step of cold mould molding. According to the step of forced cooling, sheet metal is cooled to a certain temperature and then deformed. By adopting the heat treatment method, the hot punching moldability of the aluminum alloy can be improved. By adopting the heat treatment method that after solution treatment, the sheetmetal is fast cooled to a molding temperature, the ductility of a material under a high temperature is fully used, and the moldability of the component is further improved on the basis of an existingaluminum alloy hot punching process.

Description

technical field [0001] The invention mainly belongs to the field of plastic forming processing of metal materials, and in particular relates to a heat treatment method for improving the formability of 7075 aluminum alloy by hot stamping. Background technique [0002] 7075 aluminum alloy is an aluminum alloy with zinc as the main alloying element. It belongs to the aluminum alloy that can be strengthened by heat treatment. It is the most commonly used 7XXX series high-strength aluminum alloy. The main reason for limiting the application of 7075 aluminum alloy sheet is that the plastic elongation of the material at room temperature is low, and the elongation at break is basically below 15%. In the prior art, in order to improve the stamping formability of the 7075 aluminum alloy, the aluminum alloy hot stamping process is applied to the stamping forming of the 7075 aluminum alloy, which improves the plasticity of the material during the forming process without reducing the str...

Claims

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Application Information

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IPC IPC(8): C22F1/04
CPCC22F1/04
Inventor 王宝雨校文超林建国杨晓明孟思齐
Owner UNIV OF SCI & TECH BEIJING
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