Aluminum alloy section for rail traffic car body skirtboard and manufacturing method of aluminum alloy section

A technology of aluminum alloy profiles and rail transit, which is applied in the direction of manufacturing tools, metal extrusion control equipment, metal extrusion, etc., can solve the problems of many waste products, difficult size, large deformation, etc., to reduce manufacturing costs, reduce unnecessary The effect of pass rate and good mechanical properties

Inactive Publication Date: 2017-11-07

SHANDONG NANSHAN ALUMINUM +1

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AI-Extracted Technical Summary

Problems solved by technology

The shape of the existing rail transit car body skirt is relatively complex, hollow, thin and long (about 2m in length)

[0003] In the existing technology, the control range of each link in the extrusion process of aluminum alloy profiles for rail transit car body skirts is relatively wide, and the control of the heat treatment process is difficult, and the prepared aluminum alloy profiles are prone to defects such as distortion and deformation during the heat treatment process , has a great influence on the size and mechanical properties of the skirt plate, and cannot guaran...

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Abstract

An aluminum alloy profile for a rail transit car body skirt and a manufacturing method thereof, relating to the technical field of preparation of aluminum alloy profiles, the manufacturing method of the aluminum alloy profile for a rail transit car body skirt includes the following steps: alloy smelting, refining treatment, Casting into rods, sawing of cast rods, homogenization annealing, surface peeling of cast rods, heating of cast rods, extrusion, online quenching, stretching straightening, sawing, surface shaping, artificial aging, the manufacturing method strictly controls the process steps Each parameter can be mass-produced with qualified wall dimensions and good mechanical properties, meeting the strength requirements of aluminum alloy materials for rail transit car body skirts; the prepared aluminum alloy profiles for rail transit car body skirts can be specially used The production of rail transit car body skirts can reduce the occurrence of unqualified rates, improve production efficiency, and reduce manufacturing costs.

Application Domain

Extrusion control devices

Technology Topic

QuenchingRail transportation +7

Image

Examples

Experimental program(6)
Effect test(1)

Example Embodiment

[0057] Example 1

[0058] This embodiment provides an aluminum alloy profile for rail transit car body skirts, which is produced by the following manufacturing method:

[0059] a. Melting: Put the pure electrolytic aluminum liquid into the dump smelting furnace, add other alloying element components for smelting, the smelting temperature is 745 ℃, so that the raw materials are completely melted, and the aluminum alloy melt with uniform composition is obtained. The melt consists of the following alloying elements in weight fraction: Si: 0.57%, Fe: 0.10%, Cu: 0.13%, Mn: 0.18%, Mg: 0.58%, Cr: 0.11%, Zn: 0.08%, Ti :0.02%, Mn+Cr: 0.28%, other single elements ≤0.05%, total other impurity elements ≤0.15%, the balance is Al.

[0060] b. Refining treatment: transfer the above-mentioned melt to a holding furnace, and then adjust the temperature of the melt to 740°C for refining in the furnace: the volume ratio of the argon-chlorine mixed gas introduced is 75% for argon and 75% for chlorine 25%, the rotor speed is 300rpm, the argon flow is set to 180L/min, the chlorine flow is set to 30L/min, the refining time is 50min, and the purging time is 3min. Then pour the melt in the holding furnace into the launder for online refinement, SNIF online degassing, CFF plate filtration, MCF tubular filtration: the online refinement uses a wire feeder to add Al-5Ti-1B wire to the flow In the tank, the addition amount is 1.5kg/t; SNIF online degassing adopts double rotors, and the argon flow of rotor 1 and rotor 2 is 4.8m 3 /h, the chlorine flow of rotor 1 and rotor 2 is 0.03m 3 /h, the rotor speed is 500r/min; CFF plate filter adopts double-layer filter plate to filter.

[0061] c. Casting into rods: Casting the above-mentioned refined and purified melt into cast rods with a casting temperature of 695°C and a casting speed of 125mm/min. The cast rod is 6A01 alloy, and its alloy element composition is the same as that of the above-mentioned melt.

[0062] d. Cast rod sawing: sawing the casting rod into a length of 730mm as an extrusion casting rod.

[0063] e. Homogenization annealing: put the extruded cast rod into a homogenization furnace for homogenization treatment, the gas temperature of the furnace is 550℃, the heating rate is 40℃/min, the holding time is 8h, and it is air-cooled to 200℃ in the cooling chamber. , And then water cooled to room temperature.

[0064] f. Peeling on the surface of the cast rod: the peeling machine is used to remove the defects of the ingot surface, oil stains, surface segregation layer, etc. The surface layer processing volume is 5mm, the surface roughness Ra=10, and the ingot diameter after peeling is 585mm.

[0065] g. Casting rod heating: use a power frequency heating furnace to heat the casting rod head, middle and tail gradient, the heating temperature is controlled at 510℃, and the head and tail temperature gradient is controlled at 20℃.

[0066] Mold and extrusion barrel heating: The mold is heated in a mold heating furnace at 500°C for 8 hours, and the extrusion barrel heating temperature is 450°C.

[0067] h. Extrusion: Using a 150MN extruder, put the heated cast rod into an extrusion barrel for extrusion processing, the extrusion coefficient is 67, the extrusion profile exit speed is 2.01m/min, and the extrusion residual height is 60mm .

[0068] i. On-line quenching: when the extruded profile exits the die, the temperature is not less than 500℃ and enters the on-line quenching zone. The quenching method selects strong air cooling and quenching. In order to ensure a high saturated solid solution in the matrix, the upper air volume is adjusted to 70%, and the lower air volume is adjusted It is 40%, and the product temperature after quenching is less than 80°C.

[0069] j. Stretch straightening and sawing: stretch and straighten the quenched extruded profile to obtain a straightened profile. When the profile is straightened, the elongation rate is controlled to 0.9%. After stretching and straightening, the finished product Sawing, sampling, ruler.

[0070] k. Surface shaping: Use leather hammer and wooden block padding to perform partial shaping of the profile. Use a special profile test template and feeler gauge to measure the product to ensure that the size is qualified. After the surface is shaped, the profile is obtained and framed.

[0071] l. Artificial aging: A two-stage aging furnace is used for aging treatment. The aging temperature in the first stage is 135℃ and the heat preservation is 2.5h. The aging temperature in the second stage is 175℃ and the heat preservation is 5.5h. After artificial aging, it can be cooled and packaged. Obtain the required aluminum alloy profile for rail transit car body skirt.

Example Embodiment

[0072] Example 2

[0073] This embodiment provides an aluminum alloy profile for rail transit car body skirts. The manufacturing method of the aluminum alloy profile for rail transit car body skirts is substantially the same as the manufacturing method in Example 1, except that: this embodiment The melt and the subsequent cast rods are composed of the following alloying elements in weight fraction: Si: 0.65%, Fe: 0.20%, Cu: 0.15%, Mn: 0.23%, Mg: 0.68%, Cr :0.17%, Zn: 0.15%, Ti: 0.04%, Mn+Cr: 0.4%, other single elements ≤0.05%, total other impurity elements ≤0.15%, the balance is Al, and finally the rail transit car body skirt Aluminum alloy profiles for plates.

Example Embodiment

[0074] Example 3

[0075] This embodiment provides an aluminum alloy profile for rail transit car body skirts. The manufacturing method of the aluminum alloy profile for rail transit car body skirts is substantially the same as the manufacturing method in Example 1, except that: this embodiment The exit speed of the extruded profile used in the middle extrusion step is 2.4m/min, and finally an aluminum alloy profile for rail transit car body skirts is produced.

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PUM

Property	Measurement	Unit
Diameter	585.0	mm
Tensile strength	>= 259.0	mPa
Strength	>= 221.0	mPa
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Good mechanical properties
Reduce the failure rate

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Increase productivity Low manufacturing cost Rail traffic Aluminium alloy Failure rate Manufacturing cost reduction Mechanical property Ultimate tensile strength

Aluminum alloy section for rail traffic car body skirtboard and manufacturing method of aluminum alloy section

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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