Surface treatment is a critical stage in machining facilities, involving the use of physical or chemical means to alter the surface state of a workpiece. This process serves to both enhance aesthetic quality and improve functional performance; consequently, the appropriate method must be selected based on the workpiece's material and intended application.
Plating processes are widely utilized for metal workpieces. Through electrolytic or chemical methods, metals such as zinc, nickel, or chromium are deposited onto the workpiece surface to form a dense protective film, which effectively resists corrosion and extends the product's service life. For workpieces requiring electrical conductivity or weldability, copper plating is frequently chosen; conversely, components requiring high wear resistance often undergo hard chrome plating to achieve an optimal balance between hardness and ductility.
Polishing processes focus on enhancing surface finish. By harnessing the abrasive action of tools-such as grinding wheels or cloth wheels-scratches and burrs are eliminated from the workpiece surface, resulting in a smooth tactile feel and reduced susceptibility to impurity adhesion. The housings and transmission components of precision instruments often undergo multiple polishing stages to ensure both aesthetic appeal and smooth operational performance.
Sandblasting involves projecting abrasive media at high velocity onto the workpiece surface to create a uniformly roughened texture. This treatment enhances the adhesion of subsequent coatings, making it particularly suitable for workpieces destined for painting or adhesive bonding. For materials prone to rusting-such as cast iron-sandblasting also serves to remove mill scale and rust, thereby laying a solid foundation for subsequent protective treatments.
The combined application of various surface treatment processes enables the fulfillment of more complex requirements. By judiciously selecting the appropriate surface treatment methods, workpieces can achieve desired standards regarding wear resistance, corrosion protection, and aesthetics, thereby elevating the overall value of the final product.
