Bending and shaping method for hollow aluminum alloy extrusion section bar

A technology for bending and extruding profiles, which is applied in the field of bending and forming of hollow aluminum alloy extruded profiles, can solve the problems of no hollow closed aluminum alloy extruded profiles and other problems, achieve low manufacturing cost, solve the problem of section deformation, The effect of maintaining the cross-sectional area

Inactive Publication Date: 2007-05-30
CHENGDU AIRCRAFT INDUSTRY GROUP
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Problems solved by technology

Aluminum alloy closed aluminum alloy extruded profiles have been used to a certain extent in foreign countries, but ther

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  • Bending and shaping method for hollow aluminum alloy extrusion section bar

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Embodiment Construction

[0014] With the method of the present invention, aluminum alloy hollow thin-wall closed aluminum alloy extruded profiles, closed cross-section plates or closed aluminum alloy extruded profiles with similar shapes that can be bent and formed in a single-piece operation, generally have a length of at least 1 meter . Before bending, a wedge with the same section as the inner section of the aluminum alloy closed aluminum alloy extrusion profile should be prepared, and the length is about 80-100mm. The hardness of the wedge should usually be lower than that of the aluminum alloy extrusion profile, and it is best to use a wooden wedge. An open end of the aluminum alloy closed aluminum alloy extruded profile part is sealed by seamless welding to seal the opening. The aluminum alloy closed aluminum alloy extruded profile part is erected with the welded end facing down, and then fine sand or sand-like material is poured inward from the open end of the unsealed part. During the sand fi...

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Abstract

A hollow aluminum alloy extrusion section bar starts sealing one opening of the extrusion hollow thin wall enclosing section bar to be bent, with the weld end upright roll down, filling sand from the upper opening till there is only a small distance unfilled space left, keeping the part upright, filling water from the opening till it is slightly higher than the sand level, putting it into the freezing chamber until the frozen of the sand and water to seal the opening with a ready made wedge, and lamping the above said parts in stretch benders or rolling bend machine. In this way, it avoids the convex and cave caused when the hollow section curves. It solves the deformation of the cross section in curving, retaining the same cross section area.

Description

Technical field: [0001] The invention relates to a bending forming method for existing hollow thin-walled aluminum alloy extrusion profiles. The hollow thin-walled aluminum alloy extruded profiles described in the present invention include but are not limited to hollow aluminum alloy closed aluminum alloy extruded profiles, and can also be hollow thin-walled profiles of other low-temperature non-brittle metal materials. Background technique [0002] In order to meet the needs of improving the light weight and high strength of rail vehicles, thin-walled lightweight components use pipes as structural materials. In the case of the same weight but high rigidity and strength, the slender and relatively large cross-sectional shapes are diverse and complex. Thin-walled closed aluminum alloy extruded profiles or pipes, the forming method adopted is a composite forming method of hydrostatic extrusion forming, bending and bulging processing. At present, it is mainly used for skeleton...

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Application Information

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IPC IPC(8): B21D9/00B21D9/16
Inventor 许崇高
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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