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Manufacturing method of 7000 series aluminum alloy member

A manufacturing method and aluminum alloy technology, which is applied in the manufacturing field of 7000 series aluminum alloy components, can solve problems such as complex procedures, achieve low cost, reduce tensile residual stress, and prevent cracks from occurring

Active Publication Date: 2022-03-04
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technology of Patent Document 2 is not applicable to T1 quenched and tempered aluminum alloy extruded profiles that can be lowered in cost. In addition, other heat treatments are required between solution treatment and warm working, and the process is also complicated.

Method used

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  • Manufacturing method of 7000 series aluminum alloy member
  • Manufacturing method of 7000 series aluminum alloy member
  • Manufacturing method of 7000 series aluminum alloy member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The 7000-series aluminum alloy extruded profile of T1 tuning was warmed from room temperature, so that the temperature was changed, and plastic processing (temperature processing) was performed at the reach temperature, and the temperature conditions of the crack occurred were investigated. In the 7000 series aluminum alloy, Mg: 1.4% by mass, Zn: 6.5% by mass, Cu: 0.15% by mass, Zr: 0.15% by mass, Cr: 0.03% by mass, Ti: 0.025% by mass, margin by Al and impurities constitute. The extruded profile is composed of: a rectangular profile having a cross section of about 50 mm × width of about 150 mm, has a pair of flanges having two hollow portions of 2 to 4 mm, a length of 150 mm; and an equal interval 3 pair of 3 lengths of a sheet of about 50 mm. This extruded profile is used, for example, as a raw material as a bumper reinforcement.

[0055] The extruded profile is disconnected to a certain length in the extrusion direction, and a test material for a temperature history and a...

Embodiment 2

[0061] For the 7000-series aluminum alloy extruded profiles of T1 injection, plastic processing is performed on various temperatures above room temperature, investigating the relationship between plastic processing temperature and stretchive residual stress. The composition of the 7000 series aluminum alloy was the same as that of Example 1. The extruded profile is a profile for, for example, a raw material used as a door anti-collision beam. Figure 5A As shown, a pair of flanges parallel to each other and a pair of web connecting the pair of flanges, the height is 35 mm, the flange and the web are perpendicular to each other. A flange (thin wall side flange) in a pair of flanges, a wall thickness of 2.2 mm, a width of about 34 mm, another flange (thick-walled side flange), a wall thickness of 5.6 mm, width of 40 mm. Further, the web thickness of the web is 2 mm, and the length is 27.2 mm.

[0062] The extruded profile is cut vertically to a certain length in the extrusion directi...

Embodiment 3

[0076] A 7000-series aluminum alloy extruded profile of the same T1 tem under Example 1 was used to form a JIS13B test piece (No. 1 to 23) from the longitudinal direction of the extrusion in the longitudinal direction. The test piece had a thickness of 3 mm. Among them, the test piece of No. 1 to 20 is warmed from the room temperature, so that the temperature reaches the temperature, the reach temperature holds a predetermined time, followed by cooling at various cooling speeds to room temperature, and performs aging treatment, measuring mechanical properties.

[0077] The arrival temperature of the test sheets of NO.1 to 20 is 150 ° C, 200 ° C, 250 ° C, 275 ° C, and the temperature rise of the reach temperature to maintain the reachable temperature of the oil bath (150 ° C, 200 ° C) or nitrogen stove (250 ° C, 275 ° C). Any of the reaching temperature is 30s, 60s, 90s, 150s, 180s, and the cooling method is natural empty or cold. From the cooling rate of the arrival temperature to...

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Abstract

The manufacturing method of the 7000-series aluminum alloy member of the present invention prevents the occurrence of cracks during the plastic processing and further reduces the tensile residual stress of the product when the T1 quenched and tempered aluminum alloy extruded profile is plastically processed to be commercialized. Improved resistance to stress corrosion cracking. After the T1 quenched and tempered 7000 series aluminum alloy extruded profile is heated to a temperature range above 150° C., plastic processing is performed in the temperature range, and after cooling, artificial aging treatment is performed. Assume that the time from the start of heating is t(s), the temperature of the extruded profile at time t is T(t) (°C), and the time until the extruded profile reaches 140°C during the heating process is t 1 , the time until the extruded material reaches 140°C again during the cooling process is t 2 when, let t 1 ≤t≤t 2 The integral value of {T(t)-140} in the interval (=F 140 ) at 5×10 5 (℃ 2 s) and below are restricted.

Description

Technical field [0001] The present invention relates to a method for producing a 7000-series aluminum alloy member, and more particularly to a method of manufacturing a 7000-series aluminum alloy member for a 7000-series aluminum alloy extruded profile of T1 mass-string. Background technique [0002] Aluminum alloy due to approximately 2.7GCM －3 It is approximately 1 / 3 of steel, so in recent years, the application of lightweight transport equipment, especially the application of automobiles. In particular, the aluminum alloy extruded profile has the following extraction: no additional processing, it is possible to obtain a long strip of closed cross section with arbitrary wall thickness, thereby facing the automobile's backbone parts and the capability parts, etc. Adoption is expanded. As such a skeleton part, a pedal, a side member, a column, etc., as a capsule part, a door reinforcement material, a bumper reinforcing material, a roof reinforcement, and the like. [0003] The li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/053
CPCC22F1/053C22F1/047
Inventor 细井宽哲
Owner KOBE STEEL LTD
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