CN103409671B - A kind of building template aluminium alloy extrusions and preparation method thereof - Google Patents

Abstract

The present invention discloses a kind of building template aluminium alloy extrusions and preparation method thereof, the composition of aluminium alloy and weight percent thereof are: magnesium 0.85 ~ 0.95%, silicon 0.60 ~ 0.65%, copper 0.15 ~ 0.20%, manganese 0.05 ~ 0.08%, zirconium 0.03 ~ 0.05%, chromium 0.04 ~ 0.06%, titanium 0.008 ~ 0.012%, iron 0 ~ 0.2%, zinc 0 ~ 0.10%, surplus is aluminium.The tensile strength of aluminium alloy extrusions of the present invention reaches more than 300MPa; Yield strength reaches more than 260MPa, tension set reaches more than 12%, toughness, weldability and solidity to corrosion are significantly improved than former 6061 alloys, pendulum-type impact value can reach more than 20J/cm2, welding coefficient is not less than 0.6, and there is less quenching sensitive, critical hardening speed of cooling is down to about 7 DEG C/S from 10 DEG C/s of former alloy.When aluminium alloy sections, high temperature section extruding temperature out ~ 450 DEG C and low-temperature zone≤250 DEG C employing air-cooled, and middle-temperature section namely quench 450 DEG C ~ 250 DEG C, sensitive area adopt water smoke cooling replace direct water-cooling, greatly reduce the control difficulty of production scene section bar section deformation.

Description

A kind of building template aluminium alloy extrusions and preparation method thereof

Technical field

The invention belongs to formula and the preparing technical field of aluminum alloy materials, the present invention is specifically related to a kind of building template aluminium alloy extrusions and preparation method thereof.

Background technology

The template of aluminum current form work engineering system and external corner material all adopt 6063 and 6061 aluminium alloy extrudedly to make, and the main component of two kinds of aluminium alloys is aluminium, magnesium, silicon, wherein, is also added with copper and chromium two kinds of auxiliary elements in 6061 aluminium alloys.6063 aluminium alloys have superior press workability and Extrusion-quenched performance, can produce at a high speed complex-shaped section bar in enormous quantities, low production cost; But this Mechanical Properties of Aluminum Alloys is not high; Strong during 6061 aluminium alloys have, anti-corrosion, the excellent over-all properties such as can to weld, become the main raw in light structures application recent decades; But its extrusion processing performance and Extrusion-quenched poor performance, in order to obtain its stable static tensile property and notch toughness, usual requirement adopts the water quenching before best extrusion machine, thus causes squeeze wood to distort, causes the raising of the reduction of production efficiency and yield rate and corresponding production cost.And two kinds of aluminium alloys are produced by traditional technology, all produce pollution freemetallurgy at intergranular, cause aluminium alloy toughness, anticorrosion stress-resistant to decline, limit the performance of material.

Summary of the invention

An object of the present invention is not enough in order to overcome degradation under existing aluminium alloy toughness, anticorrosion stress-resistant, and provide a kind of strength property high, toughness is better, and solidity to corrosion is stronger, and quenching sensitive is lower, and the building template aluminium alloy extrusions that cost performance is higher.

Two of object of the present invention is to provide a kind of preparation method of building template aluminium alloy extrusions, and the method is simple, can produce the quality improving product.

An object of the present invention is achieved through the following technical solutions:

A kind of building template aluminium alloy extrusions, is characterized in that: magnesium 0.85 ~ 0.95%, silicon 0.60 ~ 0.65%, copper 0.15 ~ 0.20%, manganese 0.05 ~ 0.08%, zirconium 0.03 ~ 0.08%, chromium 0 ~ 0.06%, titanium 0.007 ~ 0.012%, iron 0 ~ 0.2%, zinc 0 ~ 0.10%, surplus is aluminium.

An object of the present invention can also be achieved through the following technical solutions:

Further: the composition of aluminium alloy and weight percent thereof are: magnesium 0.85%, silicon 0.60%, copper 0.15%, manganese 0.05%, zirconium 0.03%, chromium 0.04%, titanium 0.008%, iron 0.01%, zinc 0.01%, surplus is aluminium.

Further: the composition of aluminium alloy and weight percent thereof are: magnesium 0.90%, silicon 0.62%, copper 0.18%, manganese 0.06%, zirconium 0.04%, chromium 0.05%, titanium 0.01%, iron 0.1%, zinc 0.08%, surplus is aluminium.

Further: the composition of aluminium alloy and weight percent thereof are: magnesium 0.95%, silicon 0.65%, copper 0.20%, manganese 0.08%, zirconium 0.05%, chromium 0.06%, titanium 0.012%, iron 0.2%, zinc 0.10%, surplus is aluminium.

Further: the composition of aluminium alloy and weight percent thereof are: magnesium 0.92%, silicon 0.63%, copper 0.19%, manganese 0.05%, zirconium 0.05%, chromium 0.04%, titanium 0.008%%, iron 0.19%, zinc 0.09%, surplus is aluminium.

Further: the composition of aluminium alloy and weight percent thereof are: magnesium 0.87%, silicon 0.60%, copper 0.17%, manganese 0.05%, zirconium 0.04%, chromium 0.05%, titanium 0.007%%, iron 0.17%, zinc 0.05%, surplus is aluminium.

Further: the composition of aluminium alloy and weight percent thereof are: magnesium 0.90%, silicon 0.62%, copper 0.16%, manganese 0.05%, zirconium 0.08%, titanium 0.008%, iron 0.02%, zinc 0.03%, surplus is aluminium.

Two of object of the present invention is achieved through the following technical solutions:

A preparation method for building template aluminium alloy extrusions, is characterized in that:

1) by weight percent be: magnesium 0.85 ~ 0.95%, silicon 0.60 ~ 0.65%, copper 0.15 ~ 0.20%, manganese 0.05 ~ 0.08%, zirconium 0.03 ~ 0.08%, chromium 0 ~ 0.06%, titanium 0.007 ~ 0.012%, iron 0 ~ 0.2%, zinc 0 ~ 0.10%, surplus is that the aluminum alloy composition of aluminium is cast as aluminium alloy cast ingot

2) aluminium alloy cast ingot is carried out high-temperature homogenization process at 565 ± 5 DEG C, heats 5 ~ 10 hours, after then adopting strong wind cooling or water smoke to be cooled to 150 DEG C, in dislocation air, continue air cooling to room temperature,

3) by ingot casting on request length cut into extruding ingot blank, send into after induction furnace quickly heats up to 480 DEG C and be squeezed into section bar by 10 ~ 15m/min velocity of discharge, section bar mold temperature out is at 535 ~ 540 DEG C, in beginning 40 second of passing through at section bar, employing speed is that section bar is cooled to 450 DEG C by 1.5 ~ 2.5 DEG C/s strong wind cooling, within 28 seconds then, be cooled to about 250 DEG C by water smoke, then adopt air cooling to room temperature;

4) by 1%-1.5% deflection tension leveling, be cut into product, frame up and repair mouth;

5) wait to stop laggard aging oven process in 8-12 hour, aging temp 175 ± 5 DEG C, is incubated 10 hours, makes aluminium alloy extrusions of the present invention.

Further: 1) by weight percent be: magnesium 0.87%, silicon 0.60%, copper 0.177%, manganese 0.05%, zirconium 0.04%, chromium 0.05%, titanium 0.007%, iron 0.17%, zinc 0.05%, surplus is that the aluminum alloy composition of aluminium is cast as aluminium alloy cast ingot, and described ingot casting is diametrically the casting rod of Φ 260mm;

2) aluminium alloy cast ingot is carried out high-temperature homogenization process at 560 DEG C, heat 9 hours, after then adopting strong wind cooling or water smoke to be cooled to 150 DEG C, in dislocation air, continue air cooling to room temperature;

3) by ingot casting on request length cut into extruding ingot blank, send into after induction furnace quickly heats up to 480 DEG C and be squeezed into section bar by 10m/min velocity of discharge, section bar mold temperature out is at 535 ~ 540 DEG C, in beginning 40 second of passing through at section bar, employing speed is that section bar is cooled to 450 DEG C by 2 DEG C/s strong wind cooling, within 28 seconds then, be cooled to about 250 DEG C by water smoke, then adopt air cooling to room temperature, described section bar is solid shape;

4) by 1.5% deflection tension leveling, be cut into product, frame up and repair mouth;

5) treat stop laggard aging oven process in 9 hours, aging temp 175 DEG C, be incubated 10 hours, make aluminium alloy extrusions of the present invention.

1, the present invention is by optimizing the content of principal element Mg and Si in aluminium alloy, by the overall control of Mg2Si in alloy in the scope of 1.40% ± 0.05%, ensure that aluminum alloy materials meets the requirements of mechanical property.Meanwhile, in aluminium alloy, add the copper being not more than 0.2%, the loss of strength caused because of Shelf―time effect aborning to make up aluminium alloy by its extra solution strengthening effect.

2, the Cr element had the greatest impact to quenching sensitive in aluminium alloy controls extremely minimum as far as possible or fully phases out by the present invention, and to suppress recrystallize ability the strongest but to replace the Zr element that quenching sensitive impact is minimum, to reduce the quenching sensitive of aluminium alloy.

3, the Mn element that aluminium alloy Central Plains exists using Impure forms controls within the scope of 0.05-0.08% as a kind of auxiliary element by the present invention, object is the disperse phase forming below size 0.1 micron order in aluminium alloy, united with the effect of Zr, reduce or eliminate without separating out district, suppress recrystallize and the grain growth of aluminium alloy, slip band is evenly expanded, reduces the stress concentration of grain boundaries, improve unit elongation and the toughness of aluminium alloy; Meanwhile, accelerate the conversion of aluminium alloy β (AlFeSi) α (AlFeSi) phase in opposite directions in Homogenization Process, be conducive to the extrusion performance and the surface quality that improve aluminium alloy.

4, the present invention is by the free silica basically eliminate in aluminium alloy, impurity iron is controlled the level being not more than 0.2% (more low better) simultaneously, and grain-refining agent is changed to Al-Ti-C by traditional Al-Ti-B, and the content of Ti is controlled the scope 0.01% ± 0.002%, on the whole, reduce the foreign matter content of aluminium alloy, material more " is cleaned ", thus put forward heavy alloyed weldability and resistance to spot corrosion, intergranular corrosion resistance, shock proof ability comprehensively.

5, aluminium alloy of the present invention is when being processed into section bar, and adopt high-temperature homogenization process and relatively low aging temp, wherein, homogenization temperature brings up to 565 ± 5 DEG C; Aging temp is reduced to 175 ± 5 DEG C, and make supersaturation precipitation particle and Precipitation in alloy, the size of particle obtains good control with being uniformly distributed, and the overall control of the intermetallic compound in its final aluminum alloy organization is at about 1.8-2.0%.

Beneficial effect of the present invention:

1, aluminum alloy materials of the present invention is non-recrystallize fibrous tissue state (recrystallized structure is less than 50%) substantially; toughness, weldability and solidity to corrosion are significantly improved than former 6061 alloys; pendulum-type impact value can reach more than 20J/cm2; about 30% is improved than former alloy; and when employing 4043 alloy electrode carries out Shielding gas, welding coefficient (welded heat affecting zone intensity and T6 state matrix intensity ratio) is not less than 0.6.

2, aluminum alloy materials of the present invention has less quenching sensitive, and critical hardening speed of cooling is down to about 7 DEG C/S from 10 DEG C/s of former alloy.Under the large working condition of aluminium alloy sections, high temperature section extruding temperature out ~ 450 DEG C and low-temperature zone≤250 DEG C employing air-cooled, and middle-temperature section namely quench 450 DEG C ~ 250 DEG C, sensitive area adopt water smoke cooling replace direct water-cooling, greatly reduce the control difficulty of production scene section bar section deformation.

3, aluminium alloy extrusions of the present invention, its tensile strength can improve 15%, reaches more than 300MPa; Yield strength can improve 8%, reaches more than 260MPa; Tension set can improve 50%, reaches more than 12%.

Embodiment

Below in conjunction with the present invention is further illustrated.

Specific embodiment 1:

A kind of preparation method of building template aluminium alloy extrusions:

1) conventionally aluminium alloy of the present invention is prepared, the weight percent summation of each component is 100%, be (in casting flow table sampling analysis chemical composition) by weight percent: magnesium 0.92%, silicon 0.63%, copper 0.19%, manganese 0.05%, zirconium 0.05%, chromium 0.04%, titanium 0.008%%, iron 0.19%, zinc 0.09%, surplus is that the aluminum alloy composition of aluminium is cast as aluminium alloy cast ingot, and described surplus is the impurity that the aluminium in aluminium contains 0.15%, and with the impurity phase that contains in existing aluminium with, ingot casting is diametrically the casting rod of Φ 260mm;

2) aluminium alloy cast ingot is carried out high-temperature homogenization process at 560 DEG C, heat 7 hours, after then adopting strong wind cooling or water smoke to be cooled to 150 DEG C, in dislocation air, continue air cooling to room temperature;

3) by ingot casting on request length cut into extruding ingot blank, send into after induction furnace quickly heats up to 480 DEG C and be squeezed into solid shape by 15m/min velocity of discharge, solid shape die exit temperature is at 535 ~ 540 DEG C, in beginning 40 second of passing through at solid shape (profile length is about 10m), employing speed is that section bar is cooled to 450 DEG C by 1.5 DEG C/s strong wind cooling, within 28 seconds then, be cooled to about 250 DEG C by mist cold house (length is about 8m) water smoke, then adopt air cooling to room temperature;

4) by 1% deflection tension leveling, be cut into product, frame up and repair mouth;

5) treat stop laggard aging oven process in 9 hours, aging temp 173 DEG C, be incubated 10 hours, make aluminium alloy extrusions of the present invention.

Check that aluminium alloy extrusions properties of the present invention is as shown in the table:

Specific embodiment 2:

A kind of preparation method of building template aluminium alloy extrusions:

1) conventionally aluminium alloy of the present invention is prepared, the weight percent summation of each component is 100%, be (in casting flow table sampling analysis chemical composition) by weight percent: magnesium 0.87%, silicon 0.60%, copper 0.17%, manganese 0.05%, zirconium 0.04%, chromium 0.05%, titanium 0.007%%, iron 0.17%, zinc 0.05%, surplus is that the aluminum alloy composition of aluminium is cast as aluminium alloy cast ingot, and described surplus is the impurity that the aluminium in aluminium contains 0.1%, and with the impurity phase that contains in existing aluminium with, ingot casting is diametrically the casting rod of Φ 260mm;

2) aluminium alloy cast ingot is carried out high-temperature homogenization process at 560 DEG C, heat 9 hours, after then adopting strong wind cooling or water smoke to be cooled to 150 DEG C, in dislocation air, continue air cooling to room temperature;

3) by ingot casting on request length cut into extruding ingot blank, send into after induction furnace quickly heats up to 480 DEG C and be squeezed into solid shape by 10m/min velocity of discharge, solid shape die exit temperature is at 535 ~ 540 DEG C, in beginning 40 second of passing through at solid shape (profile length is about 6.5m), employing speed is that section bar is cooled to 450 DEG C by 2 DEG C/s strong wind cooling, within 28 seconds then, be cooled to about 250 DEG C by mist cold house (length is about 8m) water smoke, then adopt air cooling to room temperature;

4) by 1.5% deflection tension leveling, be cut into product, frame up and repair mouth;

5) treat stop laggard aging oven process in 9 hours, aging temp 175 DEG C, be incubated 10 hours, make aluminium alloy extrusions of the present invention.

Check that aluminium alloy extrusions properties of the present invention is as shown in the table:

Specific embodiment 3:

A kind of preparation method of building template aluminium alloy extrusions:

1) conventionally aluminium alloy of the present invention is prepared, the weight percent summation of each component is 100%, be (in casting flow table sampling analysis chemical composition) by weight percent: magnesium 0.90%, silicon 0.62%, copper 0.16%, manganese 0.05%, zirconium 0.08%, titanium 0.008%, iron 0.02%, zinc 0.03%, surplus is that the aluminum alloy composition of aluminium is cast as aluminium alloy cast ingot, described surplus is the impurity that the aluminium in aluminium contains 0.08%, and with the impurity phase that contains in existing aluminium with, ingot casting is diametrically the casting rod of Φ 260mm;

2) aluminium alloy cast ingot is carried out high-temperature homogenization process at 560 DEG C, heat 9 hours, after then adopting strong wind cooling or water smoke to be cooled to 150 DEG C, in dislocation air, continue air cooling to room temperature;

3) by ingot casting on request length cut into extruding ingot blank, send into after induction furnace quickly heats up to 480 DEG C and be squeezed into solid shape by 15m/min velocity of discharge, solid shape die exit temperature is at 535 ~ 540 DEG C, in beginning 40 second of passing through at solid shape (profile length is about 10m), employing speed is that section bar is cooled to 450 DEG C by 2 DEG C/s strong wind cooling, within 28 seconds then, be cooled to about 250 DEG C by mist cold house (length is about 8m) water smoke, then adopt air cooling to room temperature;

4) by 1.5% deflection tension leveling, be cut into product, frame up and repair mouth;

5) treat stop laggard aging oven process in 10 hours, aging temp 175 DEG C, be incubated 10 hours, make aluminium alloy extrusions of the present invention.

Check that aluminium alloy extrusions properties of the present invention is as shown in the table:

Specific embodiment 4:

A kind of preparation method of building template aluminium alloy extrusions:

1) conventionally aluminium alloy of the present invention is prepared, the weight percent summation of each component is 100%, be (in casting flow table sampling analysis chemical composition) by weight percent: magnesium 0.85%, silicon 0.60%, copper 0.15%, manganese 0.05%, zirconium 0.03%, chromium 0.04%, titanium 0.008%, iron 0.01%, zinc 0.01%, surplus is that the aluminum alloy composition of aluminium is cast as aluminium alloy cast ingot, and described surplus is the impurity that the aluminium in aluminium contains 0.05%, and with the impurity phase that contains in existing aluminium with, ingot casting is diametrically the casting rod of Φ 260mm;

2) aluminium alloy cast ingot is carried out high-temperature homogenization process at 565 DEG C, heat 5 hours, after then adopting strong wind cooling or water smoke to be cooled to 150 DEG C, in dislocation air, continue air cooling to room temperature;

3) by ingot casting on request length cut into extruding ingot blank, send into after induction furnace quickly heats up to 480 DEG C and be squeezed into solid shape by 15m/min velocity of discharge, solid shape die exit temperature is at 535 ~ 540 DEG C, in beginning 40 second of passing through at solid shape (profile length is about 10m), employing speed is that section bar is cooled to 450 DEG C by 2 DEG C/s strong wind cooling, within 28 seconds then, be cooled to about 250 DEG C by mist cold house (length is about 8m) water smoke, then adopt air cooling to room temperature;

4) by 1% deflection tension leveling, be cut into product, frame up and repair mouth;

5) treat stop laggard aging oven process in 8 hours, aging temp 170 DEG C, be incubated 10 hours, make aluminium alloy extrusions of the present invention.

Specific embodiment 5:

A kind of preparation method of building template aluminium alloy extrusions:

1) conventionally aluminium alloy of the present invention is prepared, the weight percent summation of each component is 100%, be (in casting flow table sampling analysis chemical composition) by weight percent: magnesium 0.90%, silicon 0.62%, copper 0.18%, manganese 0.06%, zirconium 0.04%, chromium 0.05%, titanium 0.01%, iron 0.1%, zinc 0.08%, surplus is that the aluminum alloy composition of aluminium is cast as aluminium alloy cast ingot, and described surplus is the impurity that the aluminium in aluminium contains 0.01%, and with the impurity phase that contains in existing aluminium with, ingot casting is diametrically the casting rod of Φ 260mm;

2) aluminium alloy cast ingot is carried out high-temperature homogenization process at 565 DEG C, heat 8 hours, after then adopting strong wind cooling or water smoke to be cooled to 150 DEG C, in dislocation air, continue air cooling;

3) by ingot casting on request length cut into extruding ingot blank, send into after induction furnace quickly heats up to 480 DEG C and be squeezed into solid shape by 10m/min velocity of discharge, solid shape die exit temperature is at 535 ~ 540 DEG C, in beginning 40 second of passing through at solid shape (profile length is about 6.5m), employing speed is that section bar is cooled to 450 DEG C by 1.5 DEG C/s strong wind cooling, within 28 seconds then, be cooled to about 250 DEG C by mist cold house (length is about 8m) water smoke, then adopt air cooling to room temperature;

4) by 1.3% deflection tension leveling, be cut into product, frame up and repair mouth;

5) treat stop laggard aging oven process in 9 hours, aging temp 175 DEG C, be incubated 10 hours, make aluminium alloy extrusions of the present invention.

Specific embodiment 6:

A kind of preparation method of building template aluminium alloy extrusions:

1) conventionally aluminium alloy of the present invention is prepared, the weight percent summation of each component is 100%, be (in casting flow table sampling analysis chemical composition) by weight percent: magnesium 0.95%, silicon 0.65%, copper 0.20%, manganese 0.08%, zirconium 0.05%, chromium 0.06%, titanium 0.012%, iron 0.2%, zinc 0.10%, surplus is that the aluminum alloy composition of aluminium is cast as aluminium alloy cast ingot, and described surplus is the impurity that the aluminium in aluminium contains 0.07%, and with the impurity phase that contains in existing aluminium with, ingot casting is diametrically the casting rod of Φ 260mm;

2) aluminium alloy cast ingot is carried out high-temperature homogenization process at 570 DEG C, heat 10 hours, after then adopting strong wind cooling or water smoke to be cooled to 150 DEG C, in dislocation air, continue air cooling to room temperature;

3) by ingot casting on request length cut into extruding ingot blank, send into after induction furnace quickly heats up to 480 DEG C and be squeezed into solid shape by 15m/min velocity of discharge, solid shape die exit temperature is at 535 ~ 540 DEG C, in beginning 40 second of passing through at solid shape (profile length is about 10m), employing speed is that section bar is cooled to 450 DEG C by 2.5 DEG C/s strong wind cooling, within 28 seconds then, be cooled to about 250 DEG C by mist cold house (length is about 8m) water smoke, then adopt air cooling to room temperature;

4) by 1.5% deflection tension leveling, be cut into product, frame up and repair mouth;

5) treat stop laggard aging oven process in 12 hours, aging temp 180 DEG C, be incubated 10 hours, make aluminium alloy extrusions of the present invention.

Claims (2)

1. a preparation method for building template aluminium alloy extrusions, is characterized in that:

1) by weight percent be: magnesium 0.85 ~ 0.95%, silicon 0.60 ~ 0.65%, copper 0.15 ~ 0.20%, manganese 0.05 ~ 0.08%, zirconium 0.03 ~ 0.08%, chromium 0 ~ 0.06%, titanium 0.007 ~ 0.012%, iron 0 ~ 0.2%, zinc 0 ~ 0.10%, surplus is that the aluminum alloy composition of aluminium is cast as aluminium alloy cast ingot;

2) aluminium alloy cast ingot is carried out high-temperature homogenization process at 565 ± 5 DEG C, heat 5 ~ 10 hours, after then adopting strong wind cooling or water smoke to be cooled to 150 DEG C, in dislocation air, continue air cooling to room temperature;

3) by ingot casting on request length cut into extruding ingot blank, send into after induction furnace quickly heats up to 480 DEG C and be squeezed into section bar by 10 ~ 15m/min velocity of discharge, section bar mold temperature out is at 535 ~ 540 DEG C, in beginning 40 second of passing through at section bar, employing speed is that section bar is cooled to 450 DEG C by 1.5 ~ 2.5 DEG C/s strong wind cooling, within 28 seconds then, be cooled to 250 DEG C by water smoke, then adopt air cooling to room temperature;

4) by 1%-1.5% deflection tension leveling, be cut into product, frame up and repair mouth;

5) wait to stop laggard aging oven process in 8-12 hour, aging temp 175 ± 5 DEG C, is incubated 10 hours, makes aluminium alloy extrusions.

2. the preparation method of a kind of building template aluminium alloy extrusions according to claim 1, is characterized in that:

1) by weight percent be: magnesium 0.87%, silicon 0.60%, copper 0.177%, manganese 0.05%, zirconium 0.04%, chromium 0.05%, titanium 0.007%, iron 0.17%, zinc 0.05%, surplus is that the aluminum alloy composition of aluminium is cast as aluminium alloy cast ingot, and described ingot casting is diametrically the casting rod of Φ 260mm;

2) aluminium alloy cast ingot is carried out high-temperature homogenization process at 560 DEG C, heat 9 hours, after then adopting strong wind cooling or water smoke to be cooled to 150 DEG C, in dislocation air, continue air cooling to room temperature;

3) by ingot casting on request length cut into extruding ingot blank, send into after induction furnace quickly heats up to 480 DEG C and be squeezed into section bar by 10m/min velocity of discharge, section bar mold temperature out is at 535 ~ 540 DEG C, in beginning 40 second of passing through at section bar, employing speed is that section bar is cooled to 450 DEG C by 2 DEG C/s strong wind cooling, within 28 seconds then, be cooled to 250 DEG C by water smoke, then adopt air cooling to room temperature, described section bar is solid shape;

4) by 1.5% deflection tension leveling, be cut into product, frame up and repair mouth;

5) treat stop laggard aging oven process in 9 hours, aging temp 175 DEG C, be incubated 10 hours, make aluminium alloy extrusions.