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Processing method for increasing stamping formability of 6111 aluminium alloy automobile sheet

A technology of stamping formability and processing method, which is applied in the field of processing to improve the formability of 6111 aluminum alloy automobile sheets, can solve the problems that the stamping formability of aluminum alloy automobile sheets cannot meet the requirements of stamping production, achieve considerable social and economic benefits, improve Stamping yield and the effect of reducing stamping costs

Inactive Publication Date: 2010-11-17
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the stamping formability of existing T4 and T4P state 6111 aluminum alloy automobile sheets cannot meet the stamping production requirements, the present invention provides a processing technology that can significantly improve its formability and is suitable for industrial production

Method used

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  • Processing method for increasing stamping formability of 6111 aluminium alloy automobile sheet
  • Processing method for increasing stamping formability of 6111 aluminium alloy automobile sheet

Examples

Experimental program
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Effect test

Embodiment 1

[0011] The 6111 alloy slab ingot produced by semi-continuous casting is put into the circulating air furnace at room temperature, and the temperature is raised to 370°C for 3 hours, then the temperature is raised to 550°C for 24 hours, and the furnace is air-cooled. To start rolling, first roll 3 passes along the width direction of the slab, and then roll along the length direction of the slab to form a plate with a thickness of about 6 mm. After cutting the hot-rolled sheet to length, it is directly annealed at 420°C for 2 hours, and finally cold-rolled into a thin sheet with a thickness of 0.8 mm. The sheet was subjected to solution treatment at 550°C×7min in a salt-bath furnace, and then placed in a drying oven for pre-aging treatment at 170°C×5min within 1 minute, and then placed at room temperature for 2 weeks before tensile and cupping tests were performed. After the plate is pre-deformed by 2%, it is heated in a drying oven at 170°C×30min to simulate baking paint, and t...

Embodiment 2

[0013] The 6111 alloy flat ingot produced by semi-continuous casting is put into the circulating air furnace at room temperature, and the temperature is raised to 220°C for 10 hours, then heated to 550°C for 24 hours, then air-cooled after being cut and milled, and reheated to 445°C To start rolling, first roll 3 passes along the width direction of the slab, and then roll along the length direction of the slab to form a plate with a thickness of about 6 mm. After cutting the hot-rolled sheet to length, it is directly annealed at 430°C×1h, and finally cold-rolled into a thin sheet with a thickness of 1.0mm. The sheet was subjected to solution treatment in a salt bath furnace for 550°C×7min, then quenched at room temperature for 48h, then placed in a drying oven for pre-aging treatment at 200°C×6min, and then stretched and stretched after 2 weeks at room temperature. In the cupping test, the plate is pre-deformed by 2%, and then heated in a drying oven at 170°C×30min to simulate...

Embodiment 3

[0015] The 6111 alloy flat ingot produced by semi-continuous casting is put into the circulating air furnace at room temperature, and the temperature is raised to 300°C for 15 hours, and then the temperature is raised to 550°C for 24 hours, and the furnace is air-cooled. After cutting the head and milling, reheat to 440°C To start rolling, first roll 3 passes along the width direction of the slab, and then roll along the length direction of the slab to form a plate with a thickness of about 6 mm. After cutting the hot-rolled plate to length, it is directly annealed at 420°C for 1.5h, and finally cold-rolled into a thin plate with a thickness of 0.8mm. The sheet was solution treated in a salt bath furnace for 550°C×7min, quenched, and then parked at room temperature for 12 hours, then placed in a drying oven for pre-aging treatment at 165°C×15min, and stretched after 2 weeks at room temperature. In the cupping test, the plate is pre-deformed by 2%, and then heated in a drying o...

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Abstract

The invention relates to a processing method for increasing the stamping formability of the 6111 aluminium alloy automobile sheet. The method comprises the following steps: 1. performing heat treatment to 6111 alloy ingot, which is prepared through semicontinuous casting, at 220-480 DEG C for 1-15h, heating to 550 DEG C with the furnace, keeping temperature for 24h to perform the conventional homogenizing treatment; 2. cropping the ingot and milling the face of the ingot, heating to 440-450 DEG C for hot rolling, wherein hot rolling adopts the mode of longitudinal and lateral alternation, thetotal rolling deformation is more than 85%, the finishing temperature is more than 300 DEG C and the final thickness of the hot rolled sheet is 6mm; 3. keeping the temperature of the hot-rolled sheetto 420-430 DEG C for 1h-2h, performing intermediate annealing, performing cold rolling to ensure the thickness of the sheet is 0.8 mm-1.0 mm, wherein the cold deformation is more than 75%; 4. keepingthe temperature of the cold-rolled sheet to 550 DEG C for 7min, performing solution treating and water quenching, standing at the room temperature for 1min-48h; 5. performing pre-aging treatment in adrying box at 150-220 DEG C for 4min-15min; and 6. standing at the room temperature for more than two weeks to obtain T4P temper. After the sheet is processed by the method of the invention, the stamping formability and after-painting strength are obviously improved, thus facilitating to increase the rate of stamping products and reduce the stamping cost.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, in particular to a processing method for improving the formability of 6111 aluminum alloy automobile plates. Background technique [0002] Energy saving and emission reduction force automobiles to constantly reduce their weight. The 6xxx series aluminum alloy sheet that can be strengthened by heat treatment has the characteristics of high specific strength, good formability, bake hardening ability, corrosion resistance and easy recycling, so it has become an ideal light-weight automobile body panel material. Developed countries such as Europe, America and Japan have successively registered 6016, 6111, 6181 and 6022 aluminum alloy grades for body panels in the world. Among them, 6111 alloy plates are favored by European and American countries because of their highest strength, so as to achieve more significant reduction. To emphasize the effect, countries such as Europe and the United Sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/38B21B37/00C21D1/26C21D1/18C21D1/00
Inventor 田妮赵刚王建军刘春明左良
Owner NORTHEASTERN UNIV LIAONING
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