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A production process of ultra-high-strength 7055 aluminum alloy profiles

An aluminum alloy profile and production process technology, applied in the field of aluminum alloy hot extrusion, can solve the problems of prone to cracks and low extrusion efficiency of 7055 aluminum alloy profiles, reduce extrusion resistance, optimize extrusion process parameters, reduce The effect of small mold deformation

Active Publication Date: 2019-04-19
CHINA ZHONGWANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention provides a production process for ultra-high-strength 7055 aluminum alloy profiles in order to solve the problems of low extrusion efficiency of 7055 aluminum alloy profiles and easy occurrence of cracks in the extrusion process

Method used

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  • A production process of ultra-high-strength 7055 aluminum alloy profiles
  • A production process of ultra-high-strength 7055 aluminum alloy profiles
  • A production process of ultra-high-strength 7055 aluminum alloy profiles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A production process of ultra-high-strength 7055 aluminum alloy profiles, comprising the following steps:

[0027] A. Melting and casting: prepare aluminum alloy raw materials according to the weight ratio of 7055 aluminum alloy, add the prepared aluminum alloy raw materials into the melting furnace and mix them evenly, then melt them into liquid aluminum alloys, cool and cast the liquid aluminum alloys into aluminum alloy casting rods;

[0028] B. Homogenization treatment: heat the aluminum alloy cast rod to 475°C, keep it warm for 12 hours, and cool to normal temperature to obtain a homogeneous aluminum alloy cast rod;

[0029] C. Extrusion: Send the homogenized aluminum alloy cast rod into the extruder for extrusion, so that the aluminum alloy cast rod can pass through the extruder smoothly and then enter the mold, and then extruded in the mold to obtain 7055 aluminum For alloy profiles, the heating temperature of the mold is 440°C, the heating time is 5 hours, the h...

Embodiment 2

[0032] The difference between Example 2 and Example 1 is that in step B, the aluminum alloy cast rod is heated to 485° C., kept for 10 hours, and cooled to room temperature to obtain a homogeneous aluminum alloy cast rod.

Embodiment 3

[0034] The difference between Example 3 and Example 1 is that the heating temperature of the mold in step C is 460°C, the heating time is 5 hours, the heating temperature of the extrusion cylinder is 420°C, the heating temperature of the aluminum alloy cast rod is 400°C, and the aluminum alloy casting rod is 400°C. The extrusion speed of the alloy cast rod is 0.8m / min, the diversion port of the mold is a butterfly structure, the corner of the butterfly structure at the diversion port of the mold is arc-shaped, the length of the working belt in the mold is 25mm, and the working belt is set There is a cooling device, the cooling device includes a liquid nitrogen system and a temperature control system, and the extrusion breakthrough pressure of the mold is 19bar.

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Abstract

The invention belongs to the field of aluminum alloy hot extrusion, and relates to a ultrahigh-strength 7055 aluminum alloy profile production process. Through improvement of an extrusion mold, the size of a working tape is shortened from 18-28 mm to 13-25 mm, the extrusion breakthrough pressure is reduced from 25 bar to 19 bar; the heating temperature of a ultrahigh-strength 7055 aluminum alloy profile extrusion mold is maintained within 450+-10 DEG C in the extrusion process, and is kept invariable by 5 hours; the heating temperature of an extrusion cylinder is lowered from 420+-10 DEG C to410+-10 DEG C; the heating temperature of a cast rod is lowered from 420+-10 DEG C to 390+-10 DEG C; finally, the profile extrusion efficiency is improved from 0.3-0.5 m / min to 0.7-0.8 m / min; and through reasonable selection of an extruder and optical design of an extrusion mold and an extrusion process, profile products meeting United States standards are finally realized to replace foreign imports.

Description

technical field [0001] The invention belongs to the field of hot extrusion of aluminum alloys, and relates to a production process of ultra-high-strength 7055 aluminum alloy profiles. Background technique [0002] 7055 alloy is also known as ultra-high-strength aluminum alloy. Its extruded profiles are mainly used in stressed structural parts such as wing panels and wing skins. Most of the 7055 alloy extruded profiles rely on imports. It is still in the development stage, and only a few units have the ability to develop 7055 alloy, but there are still many problems, mainly reflected in: (1) 7055 aluminum alloy has high strength, high extrusion deformation resistance, and product dimensional tolerance is difficult to control; ( 2) The extrusion efficiency of the profile is low, and defects such as cracks are prone to appear on the surface of the profile during the extrusion process. Contents of the invention [0003] In view of this, the present invention provides a produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/053
Inventor 王彦俊盖洪涛徐鑫刘兆伟李洪林刘丽
Owner CHINA ZHONGWANG
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