Vacuum differential pressure pressurization casting method and device

Abstract

The invention provides a supercharging casting method with vacuum difference pressure, which comprises that (1) a mould after being mold-matched, located and mounted is arranged on an upper-deck cabin, (2) a lower-deck cabin filled with molten metal and the upper-deck cabin are in butt joint, the pouring channel mouth and throat on the bottom of the upper-deck cabin mould aligns the upper mouth of a water raising pipe of the lower-deck cabin and seal the edge, thereby leading the upper-deck cabin and the lower-deck cabin to form a passage via the pouring channel mouth, throat and the water raising pipe, (3) the upper-deck cabin and the lower-deck cabin are evacuated and simultaneously the sub-atmospheric pressure balance of the two cabins are kept, (4) a vacuum valve is closed and the vacuum-pumping is stopped, (5) an air inlet valve of the lower-deck cabin is opened and the pressure which step by step leads the two cabins to produce pressure difference which forces the molten metal of the lower-deck cabin to lift to the upper-deck cabin is increased, then the air inlet valve of the lower-deck cabin is closed, (6) the throat is closed, and an air inlet valve of the upper-deck cabin is opened and the pressure starts being added to the upper-deck cabin, keeping for 5 to 15 minutes after the pressure reached 0.2 to 2 Pa until the molten metal of the upper-deck cabin is all solidified. The invention further provides a supercharging casting device with vacuum difference pressure. The invention is capable of improving compactness degree and quality of the casting products, effectively produces 'flawless casting products', and effectively and reliably meets the requirement of scientific researches, military and high-quality casting products.

Description

Technical field: [0001] The present invention relates to the casting method, especially to be suitable for the requirement of making high-density, high-quality casting products. Background technique: [0002] The density (pinhole degree) and casting quality of the castings in the existing casting process cannot be guaranteed, and cannot meet the high-quality requirements of scientific research and military products; the die-casting process requires expensive steel molds, and the mold production cycle is long. Defects such as internal pores cannot be eliminated, so it is not suitable for casting larger parts; the surface quality and dimensional accuracy of gypsum precision casting can basically meet the high standard technical requirements, but casting defects are inevitable for castings with large volume or wall thickness ; The metal mold casting process has better surface quality and internal structure, but it is easy to produce casting defects for complex parts or parts wi...

AI Technical Summary

Problems solved by technology

Especially for products with complex structure, high quality requirements, large size and short cycle requirements, there is no reliable and advanced technology and equipment to guarantee

Images