Magnesium alloy plate rolling method (1)

This article mainly talks about the conventional rolling method in the magnesium alloy rolling method.

Magnesium alloys are the lightest metal structure materials in the actual application. At the same time, magnesium alloy has high strength and high stiffness, large elastic modulus, good biocompatibility, good thermal conductivity, strong electromagnetic shielding ability, and damping shock absorption The advantages of good performance are widely used in the fields of aerospace, transportation, defense military workers, equipment manufacturing, and 3C electronics, and are known as "the most promising green engineering materials in the 21st century".

Rolling is one of the main methods of producing magnesium alloy plates, which can flexibly produce plates with different thickness and width. Rolling is the most economical and effective method for preparing magnesium alloy plates in plastic forming methods. The rolling process can refine grains, improve organizations and significantly improve the mechanical properties of alloy. Many types of rolling technologies have been developed for many years. However, the rolling technology of magnesium alloy plates is not yet mature, and the heterosexuality is high, the stamping formability is poor, the edge cracking is severe, and the material utilization rate is low. develop.

What are the magnesium alloy rolling methods?

The rolling method can be divided into conventional rolling and special rolling. Conventional rolling is divided into: traditional rolling, hot squeeze rolling and double roller continuous cast rolling; special rolling mainly include: asynchronous rolling, cross -rolling, large strain rolling, electric pulse rod, etc.

Routine rolling (NR)

1.1 Traditional rolling

Traditional rolling is the process of hot rolling and warm magnesium alloy ingots on the rolling machine, and sometimes the process of preparing magnesium alloy plates with cold rolling is also used.

The traditional rolling method can refine the grain of magnesium alloy tissue, which can improve the mechanical properties to a certain extent, but it also has some shortcomings. Because of the process measures of multiple small deformed volume rolling, the intermediate annealing and heating rolls are required, which is inefficient and waste resources, resulting in the cost of rolling production of magnesium alloy plates.

1.2 Hot squeeze rolling

Generally speaking, the thermal squeezing rolling method is a rolling process that is rolled into the shape required by the heat squeeze rolling.

Because the squeezing process is performed in the squeezing cylinder, the heat dissipation of the board is slow, and its plasticity is used to the greatest extent, so it can inhibit the cracks of magnesium alloys to a certain extent. Therefore Production, but there are still some shortcomings in this method, such as rolled plate size must not be too large.

1.3 Double roller continuous casting and rolling

Magnesium alloys adopt a double -roller continuous casting technology (TRC) to prepare magnesium alloy plate blanks as shown in Figure 1 and 2, which are horizontal double -rolling and rolling dual rollers. It uses 2 reverse rotation rollers as the crystal device. After melting magnesium alloy ingredients, the melt is evenly sent between the casting roller by allocating the system (casting mouth). The alloy solution has plastic deformation while cooling down) to prepare the required magnesium alloy plate blank with high efficiency.

This process does not pass through the hot rolling. Compared with the traditional method, the production cycle of the double -roller continuous cast and rolling technology is short, high efficiency, low cost, energy saving, high material rate, and the surface of the back plate is smooth and tissue performance is dense. However, this method uses this method to prepare magnesium alloy plates to have a large grain grain, which is difficult to exclude oxidation mixed and casting defects, and the size of the plate that can be produced is limited. As a result, many researchers are now adding some metal refining agents to refine castings to obtain magnesium alloy casting and rolling plates with small and uniform grains. In short, this technology has huge development potential.