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Production method of aluminum-alloy pipe for positioner in rail traffic contact line

A rail transit and aluminum alloy tube technology, applied in the field of aluminum profile processing, can solve the problems of short service life, easy cracking and corrosion of aluminum alloy tubes, and achieve the problems of easy cracking, improved corrosion resistance and toughness, and increased service life Effect

Active Publication Date: 2014-12-24
HUBEI GONADORELIN ALUMINUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of easy cracking, corrosion and short service life of the aluminum alloy tube used for the locator in the existing rail transit catenary, and to provide a production method of the aluminum alloy tube used for the locator in the rail transit catenary

Method used

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  • Production method of aluminum-alloy pipe for positioner in rail traffic contact line

Examples

Experimental program
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Effect test

example 1

[0015] Example 1: The application of the method of the present invention to produce the aluminum alloy tube 1 for the positioner in the rail transit catenary with a specification of φ32×7 (the outer diameter is 32mm, and the tube wall thickness is 7mm) includes the following steps: first select the tube material blank, and its chemical composition weight Percentages are: Si 0.01, Fe 0, Cu 0.1, Mn 0.01, Mg 2.8, Ni 0.15, Ti 0.1, Al balance; produce according to the following process steps:

[0016] ⑴ Using the above chemical composition, the specification is a solid round ingot with diameter × length = φ228mm × 350mm. Before loading the furnace, clean up the dust, aluminum scraps and other sundries on the surface of the ingot; ℃, the ingot was kept warm for 2 hours for extrusion, and the extrusion method of piercing the solid ingot was used to extrude the ingot into a seamless pipe with diameter×wall thickness=φ44×8mm; during the extrusion process, the extrusion speed was control...

example 2

[0023] Example 2: The application of the method of the present invention to produce the aluminum alloy tube 1 for the positioner in the rail transit catenary with a specification of φ32×7 (the outer diameter is 32mm, and the tube wall thickness is 7mm) is the process step: first select the tube material blank, and its chemical composition weight The percentages are: Si 0.1, Fe 0.15, Cu 0.03, Mn 0.05, Mg 2.62, Ni 0.21, Zn 0.03, Ti 0.05, Al balance; production is carried out according to the following process steps:

[0024] ⑴ Using the above chemical composition, the specification is a solid round ingot with diameter × wall thickness = φ228mm × 400mm. Before loading the furnace, clean up the dust, aluminum scraps and other sundries on the surface of the ingot; the heating temperature of the ingot is 450°C— 480°C, heat the ingot for 4 hours to extrude, adopt the extrusion method of piercing the solid ingot, extrude the ingot into a seamless pipe of φ44×8mm (outer diameter×thickne...

example 3

[0031] Example 3: The process steps of applying the method of the present invention to produce the aluminum alloy tube 1 for the positioner in the rail transit catenary with a specification of φ32×7 (the outer diameter is 32mm, and the tube wall thickness is 7mm): first select the tube material blank, and its chemical composition weight The percentages are: Si 0.25, Fe 0.4, Cu 0.01, Mn 0.1, Mg 2.2, Ni 0.35, Zn 0.1, Ti 0.1, Al balance; production is carried out according to the following process steps:

[0032] (1) Using the above chemical composition, the specification is a solid round ingot with diameter × length = φ228mm × 400mm. Before loading the furnace, clean up the dust, aluminum scraps and other sundries on the surface of the ingot; ℃, the ingot was kept warm for 5 hours for extrusion, and the extrusion method of piercing the solid ingot was used to extrude the ingot into a seamless pipe with diameter×wall thickness=φ44×8mm; during the extrusion process, the extrusion s...

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Abstract

The invention relates to a processing technique of special aluminum profiles, and particularly relates to a production method of an aluminum-alloy pipe for a positioner in a rail traffic contact line. The production method is characterized in that firstly, pipe blanks are selected, wherein the pipe blanks comprise the chemical components by weight percent: 0.01 to 0.25% of Si, 0 to 0.4% of Fe, 0.01 to 0.1% of Cu, 0.01 to 0.1% of Mn, 2.2 to 2.8% of Mg, 0.15 to 0.35% of Ni, 0 to 0.1% of Zn, 0 to 0.1% of Ti and the balancing being Al; then production is performed according to the following processing steps: heating a solid round cast ingot which comprises the chemical components to 450 DEG C to 480 DEG C, keeping the temperature for 2 hours to 5 hours, and then extruding by adopting an extruding method of solid cast ingot punching; annealing the pipe blanks put in a furnace, cold performing drawing deformation on the annealed pipe blanks for four times, then performing heating annealing, and then carrying out hollow drawing and diameter correcting on the pipe blanks by adopting a diameter correction die, so as to obtain a finished pipe with the diameter corrected to phi32*7. According to the production method, the problems of low plasticity, poor corrosion resistance, easiness in stress corrosion cracking, easiness in blackening and corrosion of the surface of the pipe and short service life of the aluminum-alloy pipe of an existing positioner are solved.

Description

technical field [0001] The invention relates to the technical field of aluminum profile processing, in particular to a production method of an aluminum alloy tube used for a positioner in a rail transit catenary. Background technique [0002] The hardness requirements of the aluminum alloy locator pipes in the rail transit catenary, the German standard is HB≥95 (connected to DIN 1747); the hardness of the pipes in Japan and France is HB≥85 and HB≥90, while the domestic standards stipulate the pipe strength On the high side, 2-series and 7-series alloys are generally used at present. Based on 2A12 pipes, T4 state δb≥421mpa, HB≥120, according to T6 state δb≥495mpa, HB is equivalent to 140, and elongation ≤8. 2 series and 7 series aluminum alloy pipes, the characteristic strength of the alloy is too high, Low plasticity, poor corrosion resistance, very sensitive to stress corrosion, pipes are prone to micro-cracks at crimping and bending, and cracks are easy to expand an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06C22C21/08
Inventor 鲁德胜
Owner HUBEI GONADORELIN ALUMINUM TECH CO LTD
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