Magnesium alloy extruded plate online hot air heating device and heating coiling method

Abstract

The invention discloses an on-line hot air heating device for magnesium alloy extrusion plates. The on-line hot air heating device comprises a support, a pinch roller mechanism used for conveying the magnesium alloy extrusion plates, box bodies, heat preservation layers and two sets of hot air nozzles. The box bodies are matched in a sliding mode in the vertical direction and hinged, inlets are formed in one ends of the box bodies, and outlets are formed in the other ends of the box bodies. The pinch roller mechanism is installed on the support and penetrates through the inlets and the outlets. The heat preservation layers are laid on the inner walls of the box bodies. The hot air nozzles are arranged at the upper parts and the lower parts of the inner walls of the box bodies and stride over the two sides of the box bodies. Intervals for the magnesium alloy extrusion plates to penetrate through are formed between the two sets of hot air nozzles. The box bodies are provided with hot air inlets communicated with the hot air nozzles. The invention further discloses a heating and winding method adopting the on-line hot air heating device for the magnesium alloy extrusion plates. According to the invention, the product quality can be improved, and the production cost can be lowered.

Description

technical field [0001] The invention relates to the field of production and processing of magnesium alloy plates and strips, in particular to an online hot air heating device for extruded magnesium alloy plates and a heating and coiling method. Background technique [0002] Magnesium, as a new material in the 21st century, has a wide range of potential applications. Its products are mainly used in interior panels and floors for aerospace, aviation, rail transit, etc., automotive interior lining panels, control panels, printed etching panels, 3C, etc. field. The key link that seriously restricts the wide application of magnesium materials is that the magnesium deformation processing technology is difficult, the number of heating passes is large, the process is complicated, and the cost is too high. [0003] Coil rolling of magnesium and magnesium alloys is one of the effective methods to improve yield and production efficiency and reduce processing costs. However, since magn...

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Problems solved by technology

The key link that seriously restricts the wide application of magnesium materials is that the magnesium deformation processing technology is difficult, the number of heating passes is large, the process is complicated, and the cost is too high

[0003] Coil rolling of magnesium and magnesium alloys is one of the effective methods to improve yield and production efficiency and reduce processing costs. However, since magnesium has a close-packed hexagonal structure, it is difficult to achieve online coiling at low temperatures. At present, the production of magnesium strips The traditional plate production is still adopted, and the roll production is still in the research and development stage

The extrusion billet rolling method can realize coil rolling, but due to the small heat capacity of the magnesium alloy and the rapid cooling, when the extruded plate reaches the coiler during the production process, the temperature of the plate has dropped below 200 ° C, resulting in difficulty in coiling

[0004] Magnesium alloy sheets are bent and deformed due to the bending radius during low-temperature coiling. Surface microcracks are prone to appear during the coiling process. In severe cases, intergranular cracks will appear, resulting in microcracks inside and outside the sheet during subsequent rolling, and the quality cannot be guaranteed.

Therefore, coil rolling is generally not recommended for magnesium plates with a thickness greater than 6mm, whether it is extruded plates, cast-rolled slabs, or large ingot hot-rolled plates, which realizes coil rolling for magnesium plates and strips. It brings many limitations, and at the same time increases the cost and difficulty accordingly, reducing the finished product rate and production efficiency

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