Broad-width extrusion device and technique thereof

Abstract

The invention relates to a broad-width extrusion device and an extrusion technology. The extrusion device comprises an extrusion machine and a temperature measuring-cooling system. The extrusion device is characterized in that the extrusion machine is provided with flat extrusion cavity and a flat extrusion cylinder coat adaptive with the flat extrusion cavity; a guide way is arranged below an extrusion cylinder; a combined structure of a flat extrusion rod and an extrusion seat corresponding to the flat extrusion cavity is also arranged, and the extrusion rod is connected with a piston of a hydraulic cylinder through the extrusion seat; the height and the width of the combined surface of the extrusion seat and the extrusion rod are respectively equal to and no less than the corresponding size of the extrusion rod. The invention adopts the flat extrusion cylinder, uses a flat ingot as an extrusion blank and adopts the combined structure of the flat extrusion rod and the extrusion seat so as to realize high-efficiency extrusion of flat and broad-width proximate matter of large-specification magnesium alloy and aluminum alloy and obtain broad-width proximate matter or plank stuff with the breadth exceeding 750 mm. the invention especially overcomes the defects that the magnesium alloy rolling has low rolling yield and low production efficiency, and effectively realizes the extrusion production of ultra-breadth proximate matter and plank stuff / plate blank, which is difficultly completed by a ten-thousand-ton extruding press.

Description

technical field [0001] The invention relates to extrusion equipment and extrusion tools, in particular to a wide-width extrusion device and an extrusion process. Background technique [0002] Magnesium alloy is the lightest high-performance structural material. Its large-scale plates and profiles have excellent application prospects in the manufacture of aerospace vehicles, transportation equipment, especially modern rail transportation equipment, such as floors and door panels. and other structures. However, since large-scale plates and profiles are extremely rare in the market, and the price is high, it is urgent to solve this problem from the perspective of technology and equipment. As we all know, due to the hexagonal close-packed crystal structure inside the magnesium alloy, its plastic processing resistance is greater than that of aluminum alloy under normal conditions, as shown in Table 1; the production technology of aluminum alloy is still used in the production of...

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Problems solved by technology

However, because large-scale plates and profiles are extremely rare in the market and the price is high, it is urgent to solve this problem from the perspective of technology and equipment

As we all know, due to the hexagonal close-packed crystal structure inside the magnesium alloy, its plastic processing resistance is greater than that of aluminum alloy under normal conditions, as shown in Table 1; the production technology of aluminum alloy is still used in the production of existing magnesium alloy plates, namely Ingot billeting, hot rolling, and cold rolling. In rolling, large-scale magnesium alloy ingots are difficult to billet, easy to crack, and the reduction of each pass is limited. The optimal reduction of different passes has different requirements and requires more Second-time intermediate heating (annealing) and edge cracking are relatively common, and edge trimming is required for each rolling pass, resulting in disadvantages such as low efficiency, low yield, and high cost.

Extrusion of conventional magnesium alloy profiles currently uses conventional extrusion equipment. Since the extrusion cylinder is cylindrical, the width of the produced profiles is limited by the diameter of the extrusion cylinder. Even the largest 10,000-ton extrusion machine at home and abroad, the maximum extrusion The diameter of the cylinder is only 550mm, and the maximum width of the extruded aluminum alloy profile can only reach 600mm; for the wide and large-sized profiles, such as the hollow flat profile with the outer dimension of 25mm×700mm×30000mm, its production and processing are almost impossible to achieve, such as As mentioned above, the plastic processing deformation capacity of magnesium alloy is lower than that of aluminum alloy, and the ingot widening ratio that can be achieved when extruding magnesium alloy ultra-wide sheet and ultra-wide profile is constrained by the diameter of the ingot, and the diameter of the ingot depends on depends on the diameter of the extrusion cylinder; the diameter of the traditional extrusion cylinder is determined by the maximum extrusion capacity of the extruder

Therefore, the extrusion of wide and large-size plates and profiles cannot be realized with traditional extrusion equipment

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