How to solve the influence of inclusions on the performance of diaphragm pump castings

In the field of machinery manufacturing, diaphragm pumps are key fluid transmission equipment, and the stability of their performance is closely related to the quality of castings. One of the common defects inside castings - inclusions, seriously affects the overall performance of diaphragm pumps. Inclusions not only reduce the strength and toughness of the casting, but may also cause fatigue damage, thereby significantly weakening the pump's efficiency and reliability.

Sources and effects of inclusions
Inclusions mainly originate from the following aspects: impurities in raw materials, chemical reaction by-products during the smelting process, and environmental pollution during the casting process. These inclusions form hard or soft spots inside the casting, destroying the continuity of the metal, resulting in a reduction in the effective load-bearing area, and thus a decrease in mechanical properties. In the castings of diaphragm pumps, the presence of inclusions may cause serious problems such as cracks and fractures, significantly affecting the service life and safety of the pump.

Solutions to the impact of inclusions
Optimize the selection of raw materials
The first step to control the occurrence of inclusions is to control them at the source. It is crucial to select high-quality raw materials to ensure that the content of impurities and contaminants in the raw materials is as low as possible. In the selection of alloy materials, the proportion of ingredients needs to be strictly controlled to avoid unnecessary chemical reaction by-products during the smelting process.
Improve the smelting process
The use of advanced smelting equipment and processes, such as electric furnace smelting and vacuum smelting, can effectively reduce oxidation and pollution during the smelting process. In addition, reasonable adjustment of the melting temperature and holding time will help the molten metal to fully react, thereby discharging inclusions and improving the quality of castings.
Strengthen the control of casting process
During the casting process, the gating system and mold should be properly designed to ensure that the contact between the molten metal and air is minimized during filling, thereby reducing the generation of oxidized inclusions. At the same time, through filtration, degassing and other technological means, the content of inclusions in the castings is further reduced to ensure the overall performance of the castings.
Heat treatment and surface treatment
Heat treatments on castings, such as annealing and quenching, can optimize their microstructure and significantly improve mechanical properties. In addition, surface treatment methods such as sandblasting and polishing can effectively remove inclusions and oxide layers on the surface of castings and enhance their corrosion resistance and wear resistance.
Strict quality control and testing
It is crucial to establish a complete quality control system and conduct strict testing of raw materials, smelting process, casting process and finished products. Using non-destructive testing technologies such as X-ray and ultrasonic waves, defects such as inclusions within castings can be discovered and processed in a timely manner to ensure the quality and reliability of the final product.