The polishing process and standards on the surface of the mechanical valve ball
One, Introduction
In industrial production, valves as important fluid control devices directly affect production efficiency and product quality. One of the core components of the valve is the valve ball, and the surface quality directly determines the sealing performance and service life of the valve. The key to surface quality lies in the degree of polishing on the surface of the ball, therefore, this article will discuss in detail the polishing process and standards of the surface of the mechanical valve ball.
Two, Polishing Process of the Surface of Mechanical Valve Ball
Pre-treatment: Before polishing, the ball must be cleaned, degreased, and rust-removed as pre-treatment. Cleaning can be chemical cleaning or ultrasonic cleaning to remove surface oil, dust, and other impurities. Degreasing can be done with organic solvents such as gasoline, kerosene, etc., to remove oil; rust removal can be done by acid pickling, such as hydrochloric acid, sulfuric acid, etc., to remove rust stains.
Grinding: Grinding is an important step before polishing, which can use diamond abrasives to remove the unevenness and burrs on the surface. During the grinding process, appropriate abrasive particle size and grinding speed should be selected according to the hardness and roughness characteristics of the ball surface to achieve the best polishing effect.
Polishing: Polishing is the core step of the polishing process, which can use abrasives such as white corundum, silicon carbide, and can be polished manually or automatically with a polishing machine. During the polishing process, the polishing speed and pressure must be controlled to avoid causing damage to the surface of the ball. At the same time, the cleanliness of the polishing machine must be ensured to avoid contamination of the ball surface.
Hardness testing: After polishing, hardness testing of the ball surface is required to ensure that the hardness after polishing meets the design requirements.
Three, Polishing Standards of the Surface of Mechanical Valve Ball
Surface smoothness: The surface of the ball must reach mirror-like smoothness, and the surface roughness Ra≤0.01μm.
Surface flatness: The surface of the ball must be smooth without concaves and convexes, and the surface flatness error must be less than 0.01mm.
Surface hardness: The surface of the ball must reach a hardness of HRC60-65 to ensure its good wear resistance.
Surface without defects: The surface of the ball must be free of scratches, cracks, pores, and other defects to ensure its good sealing performance and service life.
Surface without oxidation layer: The surface of the ball must be free of oxidation layer to avoid affecting its contact with the sealing ring and affecting the sealing performance.
Four, Conclusion
The polishing process and standards on the surface of the mechanical valve ball are the key links to ensure the quality of the valve. Only by strictly controlling the polishing process can the surface of the ball reach the best smoothness and hardness, thereby improving the sealing performance and service life of the valve. Therefore, enterprises should strictly follow the polishing process and standards for production to ensure product quality.