Extruding-bending integral forming method for magnesium alloy profiles

A magnesium alloy and profile technology, applied in metal extrusion, metal extrusion control equipment, metal processing equipment, etc., can solve problems such as large strain rate, serious die wear, and difficulty in ensuring the cross-sectional shape of bending parts. The effect of uniform transition and small deformation rate of section shape

Inactive Publication Date: 2008-05-21
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0003] After searching the literature of the prior art, it was found that a European invention patent (patent application number: EP0706843B1, Method and device for the production of curved workpieces, name: curved pieces) was applied for a process and equipment for making automobile frame curved pieces production method and equipment), the method is that the extruded profile is directly affected by the guide wheel with a certain movement track, the front end of the profile moves together with the guide wheel, and the end of the profile is constrained by the edge of the extrusion die outlet to form a For bending parts, since the bending deformation mainly occurs at the exit of the extrusion die, the wear of the die is very serious. In addition, due to the high strain rate during bending deformation, it is difficult to ensure the shape of the section of the bending part for thin-walled cavity profiles.

Method used

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  • Extruding-bending integral forming method for magnesium alloy profiles

Examples

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Effect test

Embodiment 1

[0021] The grade of magnesium alloy used in this example is AZ31. The extruded profile is a round tube with a diameter of 42mm and a wall thickness of 4mm. The diameter of the three rollers is 150mm and the thickness is 50mm. The outer circumference has a semicircle with a radius of 21mm. The groove adopts the split extrusion method, the diameter of the original ingot is 100mm, the preheating temperature of the billet and the mold is 350°C, the holding time is 10 minutes, the extrusion speed is 50mm / s, and the pipe at the outlet of the extruder is The temperature is 310°C, and the temperature after bending deformation is 210°C; the surface of the formed pipe has no scratches, no cracks, no wrinkles, the bending radius of curvature is 200mm, the maximum wall thickness reduction rate is 8%, and the maximum ellipticity of the cross-section 7%.

Embodiment 2

[0023] In this example, AM30 magnesium alloy is used to make a plate with a width of 120mm and a thickness of 6mm. The diameter of the three rollers is 100mm and the thickness is 130mm. There is a rectangular groove with a width of 120mm and a depth of 2mm on the outside of the circumference of the rollers. The original The diameter of the ingot is 100mm, the billet and the corresponding extrusion die are preheated to 300°C in the resistance furnace, kept for 10 minutes, the extrusion speed is adjusted to 100mm / s, and the temperature of the plate at the outlet of the extruder is 340 °C, the temperature after bending deformation is 220 °C; after forming, the surface of the plate is smooth, there is no crack on the outer arc surface of the bend, no wrinkle on the inner arc surface, no change in the cross-sectional shape, and the final bending radius of curvature is 180mm.

Embodiment 3

[0025] In this example, AM50 magnesium alloy is used to make a bar with a diameter of 30mm. The diameter of the three rollers is 150mm and the thickness is 40mm. The outer circumference has an arc-shaped groove with a radius of 15mm. The diameter of the original ingot is 100mm. The corresponding extrusion dies are heated together with the furnace to 400°C, held for 10 minutes, the extrusion speed is adjusted to 10mm / s, the surface temperature of the bar at the outlet of the extruder is 350°C, and the temperature after bending deformation is 190°C The final formed bar has good surface quality, high dimensional accuracy, no cracks on the outside of the bend, no wrinkles on the inside of the bend, the maximum ellipticity of the cross-section is less than 2%, and the average radius of curvature of the bend is 150mm.

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Abstract

The invention relates to a technical method used for extruding-bending-integral forming of a magnesium alloy sectional material, pertaining to the technical field of plasticity processing. A set of three-wheel roll bending device is arranged near a discharge port of the original horizontal extruding machine, magnesium alloy ingot blanks are molded into the sectional material through hot extrusion, the sectional material is put into the roll bending mechanism directly before being cooled, bending moment is carried out to the sectional materials by the three roll wheels that are arranged on a same surface so as to achieve bending and molding, and the movement and position of the roll wheels are controlled to gain a bending angle and a bending radius that are required. The invention can realize the extrusion, bending and continuous molding of the magnesium alloy sectional material under the condition of only heating original ingot blanks, thereby having high production efficiency and low cost.

Description

technical field [0001] The invention relates to a forming method in the technical field of plastic processing, in particular to an extrusion-bending integrated forming method for a magnesium alloy profile. Background technique [0002] Magnesium alloy, as the lightest metal structural material so far, is gradually being used in the fields of machinery, automobiles, electronics and aerospace, showing great application prospects. At present, the magnesium alloy parts actually used are mainly die castings. Due to the inherent shortcomings of the casting process, it cannot meet the strength and size requirements of various occasions. The deformed magnesium alloy has compact structure, flexible size, and comprehensive mechanical properties. Excellent and many other advantages, can meet the use requirements of a variety of structural parts, so the development of wrought magnesium alloy and its processing technology is of great significance. Commonly used deformation processing te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P13/00B21C23/02B21C31/00B21D7/08
Inventor 张平吴文云丁文江
Owner SHANGHAI JIAO TONG UNIV
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