How to determine the negative pressure and temperature during the pouring process of the lost foam casting equipment
Lost foam casting technology is an innovative casting process. With the development of China''''s foundry industry, there are currently many lost foam casting manufacturers. In the lost foam casting process, casting equipment occupies a very important position. Nowadays, sand processing The equipment has become an indispensable supporting equipment for lost foam casting. After more than ten years of experience, the three casting machine will give a detailed introduction to the negative pressure and temperature values that need to be met during the casting process of the lost foam casting equipment. If you have any help, let''''s take a look!
1. Determining the degree of negative pressure:
The role of negative pressure during pouring is mainly to compact the lost foam casting equipment to prevent sand washing, stepping box and profile wall movement. and it can accelerate the discharge of gasification products of the pattern and improve the punching ability of molten metal,
The surface of the die casting equipment is defective. If the pouring temperature is too high, the instantaneous generation of gas will be large, and a higher negative pressure is required to increase the rate of gasification product discharge. But too high negative pressure will increase the penetration energy of molten steel
After comprehensive consideration of sand formation and sintering, the negative pressure is determined to be 0.06-0.075MPa.
2. Temperature determination:
The gasification of the pattern will lose the heat of the molten steel, so the pouring temperature should also be higher. At the same time, the high temperature is conducive to the smooth discharge of the thermal decomposition products of the pattern and reduces the carbon increase of the lost foam casting equipment.
the amount. Comprehensive consideration, it is determined that the pouring temperature is controlled at 1560-1570 degrees Celsius.
Under the premise of ensuring the molding of the lost foam casting equipment, determining the temperature and the degree of negative pressure is the key, but it must be decided according to the specific situation and cannot be generalized.