Vacuum pressure casting machine for magnesium alloy

Abstract

The invention belongs to metal casting device. The magnesium alloy cast is complex, and the performance is bad. The invention is a magnesium alloy casting device which fills shape in vacuum state and solidifies them in various pressure state. It can realize the optimized casting process condition, it can be applied to produce each kind of large, complex, thin magnesium alloy casting piece with precise size and high thickness.

Description

Technical field: [0001] The invention belongs to metal casting equipment, in particular to casting equipment for producing various large, complex, thin-walled, high-quality magnesium alloy castings with strict requirements on dimensional accuracy and density. Background technique [0002] Reducing the structural weight of various machinery and vehicles is one of the main ways to save energy and protect the environment. Magnesium is the lightest structural metal material. Magnesium alloy is 37% lighter than aluminum alloy. Its specific strength and specific stiffness are second only to titanium alloy and alloy structural steel, but higher than aluminum alloy. Others, such as impact resistance and processing performance, can be The recycling performance is also better than that of aluminum alloy. Magnesium is rich in resources, easy to produce, 9% less energy in smelting than aluminum alloy, 8.5% less energy in melting and casting than aluminum alloy, die-casting mold life is...

AI Technical Summary

Problems solved by technology

[0004] Conventional low-pressure casting, crucible sealing and pressing methods have the following disadvantages: the addition of molten metal, the sealing and opening of the crucible and cleaning operations are quite troublesome and time-consuming; the crucible will "bulge" after repeated pressure, which greatly Reduce the service life of the crucible; for flammable metals such as magnesium alloy, "bulging belly" may cause serious magnesium leakage safety accidents, and the magnesium alloy liquid in the crucible leaks into the furnace cavity, usually causing a violent explosion

However, there are still some problems in the above technology. For example, due to the large capacity and high pressure of the upper and lower pressure tanks in differential pressure casting, the problems in the control of liquid level pressurization have not been solved. For example, it is difficult to establish and control the pressure of the pressure tank.

For example, problems such as unsafe production process, low productivity, difficulty in adding alloy liquid, solidification pressure conditions, and clogging of the riser pipe are particularly prominent for magnesium alloys, and there is no satisfactory solution so far.

It can be seen that the existing casting technology is still not suitable for the casting production of some magnesium alloy parts.

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