In the casting prg process, it is crucial to control the formation of pores and inclusions to ensure the quality and performance of the castings.
First, strictly control the quality of raw materials. Select metal materials with high purity to reduce the introduction of impurities. Strictly control the moisture, grease and other impurities in the smelting raw materials to prevent them from generating gas or forming inclusions during the smelting process.
Second, optimize the smelting process. Ensure sufficient degassing during metal smelting and control the smelting temperature, time and atmosphere. High-temperature smelting helps the full melting of raw materials and the floating of inclusions, but too high a temperature may also increase the amount of metal inhalation, so it is necessary to find the best smelting temperature.
Furthermore, strengthen the design and control of the pouring system. Reasonably design the pouring system to ensure that the metal liquid fills the mold smoothly and avoids the inclusion of gas. At the same time, improve the slag blocking capacity of the pouring system to prevent slag and other inclusions from flowing into the mold cavity.
In addition, improve the air permeability and exhaust capacity of the casting mold. Select suitable molding materials and improve the air permeability of the sand mold or core so that the gas can be discharged in time during the pouring process.
During the smelting and pouring process, pay attention to the slag skimming operation, clean the slag in time, and reduce the source of inclusions.
At the same time, refining treatments such as furnace refining and filtration can be used to further remove inclusions in the molten metal.
Finally, strictly control the casting process parameters, such as pouring temperature, solidification conditions, etc., to reduce the chance of pores and inclusions. Through meticulous operation and strict process control, the number of pores and inclusions can be significantly reduced, and the quality and performance of castings can be improved.
Controlling the formation of pores and inclusions in the casting prg process requires starting from multiple aspects such as raw materials, smelting process, pouring system, mold permeability, slag skimming operation, refining treatment and process parameters to fully guarantee the quality of castings.
