A Casting Roll Suitable for Reducing Edge Cracks of Magnesium Alloy Casting and Rolling Sheets

Abstract

The invention belongs to the technical field of metal material machining, and particularly relates to a casting roller design suitable for reducing edge crack of a magnesium alloy cast-rolled plate. For solving the problems of the edge crack and the non-uniform performance caused by cast rolling of the magnesium alloy plate, the invention provides acasting roller shape design capable of effectively inhibiting the edge cracking of themagnesium alloy cast-rolled plate, the design is used for guiding the production of thecast-rolled plate with the thickness of 6-10 mm, an upper roller and a lowerroller are involved and a hole shape is formed through the cooperation of the upper roller and the lower roller, the roller shape of the upper roller is in a dumbbell shape with a groove, the middleof the roller is a cylindrical shape, the two ends of the roller are the cylindrical shapes with the diameter larger than that of the column of the central part, the two ends of the columnin the middle are correspondingly provided with transition arc surface grooves with the depth of H, the lower roller is in the cylindrical shape, the radius of the lower roller is the same as the radius of the columnin the middle of the upper roller, the length of the lower roller is the distance between the two faces of the inner sides of the columns at the two ends of the upper roller, and the transition arc surfaceswith thedepth H which are the same with the roller shape of the upper roller exist at the two ends of the column. In the matching process of the upper roller and the lower roller, thespecialshape rolling hole shape is generated, so that the generation of the edgecrack can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a casting roll suitable for reducing edge cracks of magnesium alloy casting and rolling plates. Background technique [0002] With the promulgation of the national new energy vehicle and rail transit development plan, the demand for light weight of its corresponding products has been further upgraded. Magnesium alloy sheets will usher in a huge application market with their remarkable weight reduction characteristics, such as the "four doors and two doors" of automobiles. The demand for 0.5-3mm magnesium alloy sheets and strips for plates such as "cover" and inner lining boards, train inner lining boards and item racks, and mobile phone and notebook computer casings has become an important direction for the development of the magnesium alloy industry; Compared with the production of plates and strips, casting and rolling only takes a few seconds to c...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of edge cracking and uneven performance caused by casting and rolling of magnesium alloy sheets, the present invention provides a casting roll shape that can effectively suppress edge cracking of magnesium alloy casting sheets. There are many factors affecting edge cracking, the most important factor is the lateral pressure generated by the widening tendency in magnesium alloy casting and rolling, which makes the magnesium alloy slab with short solidification time and high temperature and the flank of the casting roll take a long time and violently Friction causes damage to the edge of the formed magnesium alloy sheet. In order to effectively suppress the edge cracking in the casting and rolling of the magnesium alloy sheet, the features of the casting roll designed in the present invention include a dumbbell-shaped upper roll with grooves, and end bands. The grooved cylindrical lower roll and the special rolling pass formed by the combination of the two are suitable for casting and rolling magnesium alloy strips with a thickness of 6-10mm.

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