A heat treatment method that improves the formability and bake hardenability of 6XXX series aluminum alloy sheets

A heat treatment method and bake hardening technology, applied in the field of preheating treatment, can solve the problems of limited ability of sheet baking paint strengthening, limited application of 6016 aluminum alloy, short bake hardening performance, etc., and achieve bake hardening performance retention time. Extend, save energy and equipment investment, improve the effect of machining accuracy and surface quality

A heat treatment method and bake hardening technology, applied in the field of preheating treatment, can solve the problems of limited ability of sheet baking paint strengthening, limited application of 6016 aluminum alloy, short bake hardening performance, etc., and achieve bake hardening performance retention time. Extend, save energy and equipment investment, improve the effect of machining accuracy and surface quality

CN101545083BActive Publication Date: 2010-09-01HUNAN UNIV
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  • A heat treatment method that improves the formability and bake hardenability of 6XXX series aluminum alloy sheets
  • A heat treatment method that improves the formability and bake hardenability of 6XXX series aluminum alloy sheets
  • A heat treatment method that improves the formability and bake hardenability of 6XXX series aluminum alloy sheets

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] After the aluminum alloy ingot is homogenized in a circulating air resistance furnace at 470°C×5h+540°C×15h, it is cut and face milled, hot rolled, intermittently annealed and finally cold rolled into a thin plate with a thickness of 1mm. After the sheet was quenched by solution treatment at 560°C×30min in an air circulation resistance furnace, it was immediately treated in an oil bath furnace at 65°C×5h, and then parked at room temperature for 1 month, 2 months, 3 months and Hardness test and tensile test were carried out after 4 months. The simulated paint baking is carried out in an oil bath furnace at a temperature of 180°C×30min. After the paint is baked, the hardness test and tensile test are carried out.

Embodiment 2

[0030] After the aluminum alloy ingot is homogenized in a circulating air resistance furnace at 470°C×5h+540°C×15h, it is cut and face milled, hot rolled, intermittently annealed and finally cold rolled into a thin plate with a thickness of 1mm. After the thin plate was quenched by solution treatment at 560°C×30min in an air circulation resistance furnace, it was immediately treated in an oil bath furnace at 65°C×15h, and then parked at room temperature for 1 month, 2 months, 3 months and Hardness test and tensile test were carried out after 4 months. The simulated paint baking is carried out in an oil bath furnace at a temperature of 180°C×30min. After the paint is baked, the hardness test and tensile test are carried out.

Embodiment 3

[0032] After the aluminum alloy ingot is homogenized in a circulating air resistance furnace at 470°C×5h+540°C×15h, it is cut and face milled, hot rolled, intermittently annealed and finally cold rolled into a thin plate with a thickness of 1mm. After the sheet was quenched by solution treatment at 560°C×30min in an air circulation resistance furnace, it was immediately treated in an oil bath furnace at 65°C×25h, and then parked at room temperature for 1 month, 2 months, 3 months and Hardness test and tensile test were carried out after 4 months. The simulated paint baking is carried out in an oil bath furnace at a temperature of 180°C×30min. After the paint is baked, the hardness test and tensile test are carried out.

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Abstract

The present invention provides a heat treatment method that may improve the formability and bake hardenability of 6XXX series aluminum alloy and remarkably lengthen the lasting time of bake hardenability. After solution hardening and before stamping, 6XXX series aluminum alloy sheets will undergo heat treatment for a certain period of time. The technical solution of the present invention facilitates automatic operation, can be easily realized and may save energy and equipment investment. After 6XXX series aluminum alloy sheets are treated by this method after solution hardening, its formability and bake hardenability are improved obviously. More importantly, after heat treatment by the method of the present invention, the lasting time of the bake hardenability of aluminum alloy sheets is greatly lengthened to 3-4 months, even 6 months. The above advantages will promote the substitution of aluminum alloy sheets for steel sheets to reduce car weight, thus saving energy and reducing emission while achieving desirable economic benefit.

Description

technical field [0001] The invention relates to the technical field of preheating treatment of aluminum alloy outer body plates for automobiles. The method can improve the workability, bake hardening performance and retention time of aluminum alloy plates. Background technique [0002] In the face of energy shortage, it is imperative to reduce the weight of automobiles. Aluminum alloy materials have the characteristics of high specific strength, good machinability, excellent welding performance and corrosion resistance, high impact toughness, and high-speed extrusion into various profiles with complex structures. They have many advantages in terms of energy saving, emission reduction and collision safety. Therefore, aluminum alloys have been widely used in the modern automobile industry, among which the aluminum alloys for automobile body panels are mainly 6016 and 6111 alloys. The production process of aluminum alloy sheets is roughly as follows: 1. Melting raw materials, ...

Claims

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Application Information

Patent Timeline
01 Sep 2010
Publication
CN101545083B
IPC
C22F1/04
Inventors
陈江华; 刘春辉