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A manufacturing method for eliminating Lüders bands on the surface of 5754 aluminum alloy plate

A manufacturing method and technology for aluminum alloy plates, applied in the field of automobile aluminum alloy plate manufacturing, can solve the problems of surface wrinkling, yield point elongation, and hand feeling, and achieve the effects of improving strength, improving surface quality and stable mechanical properties

Active Publication Date: 2016-10-05
DALISHEN ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the alloy in the soft state is placed at room temperature, it is prone to yield point elongation (or Luders elongation), and after stamping, the surface is wrinkled and deformed, also known as Luders band, which affects the appearance, and serious hand feeling occurs. streaks, resulting in scrap

Method used

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  • A manufacturing method for eliminating Lüders bands on the surface of 5754 aluminum alloy plate
  • A manufacturing method for eliminating Lüders bands on the surface of 5754 aluminum alloy plate
  • A manufacturing method for eliminating Lüders bands on the surface of 5754 aluminum alloy plate

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Effect test

Embodiment 1

[0054] The invention is a manufacturing method for eliminating Lüders bands on the surface of 5754 aluminum alloy plate. The manufacturing steps are: melting and casting---sawing---homogenizing annealing---milling---heating---heating Rolling---cold rolling---finished product annealing---small reduction cold rolling---finishing---packing;

[0055] (1) Melting and casting: In the melting and casting step, the mass percentage of the chemical composition of the ingot after melting and casting is

[0056]

[0057] Among them: the melting temperature is 730-740°C, the refining temperature is 720-730°C, and the casting temperature is 670-685°C;

[0058](2) Homogenization annealing: heat preservation at 550°C for 10 hours;

[0059] (3) Heating: the ingot is heated to 500°C and then kept for 2 hours;

[0060] (4) Hot rolling: the thickness of the hot-rolled billet is 6.5mm, and the final rolling temperature is 315°C;

[0061] (5) Cold rolling: After 4 passes of cold rolling to 1m...

Embodiment 2

[0069] The invention is a manufacturing method for eliminating Lüders bands on the surface of 5754 aluminum alloy plate. The manufacturing steps are: melting and casting---sawing---homogenizing annealing---milling---heating---heating Rolling---cold rolling---finished product annealing---small reduction cold rolling---finishing---packing;

[0070] (1) Melting and casting: In the melting and casting step, the mass percentage of the chemical composition of the ingot after melting and casting is

[0071]

[0072] Among them: the melting temperature is 735-740°C, the refining temperature is 725-730°C, and the casting temperature is 680-685°C;

[0073] (2) Homogenization annealing: heat preservation at 580°C for 10 hours;

[0074] (3) Heating: the ingot is heated to 500°C and then kept for 2 hours;

[0075] (4) Hot rolling: the thickness of the hot-rolled billet is 6.5mm, and the final rolling temperature is 305°C;

[0076] (5) Cold rolling: After 4 passes of cold rolling to 1...

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Abstract

The invention discloses a manufacturing method capable of eliminating Luders slips on the surface of a 5754 aluminum alloy plate. The manufacturing method comprises the steps of casting, sawing, homogenizing annealing, milling, heating, hot rolling, cold rolling, finished product annealing, low-rolling-reduction cold rolling, finishing and packaging. In the homogenizing annealing step, high-temperature heating is conducted at 550-580 DEG C, and heat preservation is conducted for 8-10 hours; the chemical components of a cast ingot are homogeneous, segregation is reduced, and internal stress is relieved. In the low-rolling-reduction cold rolling step, 0.5-10% low-rolling-reduction cold rolling is conducted on the aluminum alloy plate. By the adoption of the machining technology, no crinkled Luders slip exists on the surface of the aluminum alloy plate after stamping forming, the mechanical property of the plate is stable, the surface is smooth after stamping forming, no Luders slip exists, and the surface quality of products is improved greatly.

Description

technical field [0001] The invention relates to the technical field of manufacturing automobile aluminum alloy plates, in particular to a manufacturing method for eliminating Lüders bands on the surface of 5754 aluminum alloy plates. Background technique [0002] With the development of automobile lightweight, aluminum alloy plates have been widely used in automobiles. A 5754 wrought aluminum alloy used for automobile sheets is an Al-Mg alloy, which is mainly due to the solid solution strengthening of magnesium atoms, grain refinement strengthening, and a small amount of copper atom solid solution and precipitation strengthening. Formability. However, when the alloy in the soft state is placed at room temperature, it is prone to yield point elongation (or Luders elongation), and after stamping, the surface is wrinkled and deformed, also known as Luders band, which affects the appearance, and serious hand feeling occurs. Streaks, resulting in rejects. Contents of the inve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/047C22C21/08
Inventor 曹晓国曹旷凌亚标
Owner DALISHEN ALUMINUM
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