Basic principles of polishing and grinding

The basic principles of polishing and grinding mainly include the following:
The abrasive particle size follows the order from coarse to fine
During the polishing process, it is necessary to operate in the order of abrasive particle size from large to small, from rough to fine. For example, first use a coarse sanding wheel to remove obvious surface flaws, and then gradually replace with finer sandpaper or polishing agent to achieve a smooth effect. This principle ensures that the surface roughness gradually decreases, avoiding premature use of fine abrasives that may result in low efficiency or inability to remove deep defects.
Control speed and pressure
One of the important principles is to use high speed combined with light pressure. High speed rotating polishing tools (such as polishing wheels) can improve grinding efficiency, but excessive pressure should be avoided to prevent overheating or scratching of the workpiece surface. For example, during sheet metal polishing, the angle grinder usually operates at a high speed, but needs to maintain a stable angle and uniform pressure to prevent local indentation.
Prevent damage or deformation of the workpiece
Throughout the entire process, it is necessary to ensure that the workpiece is securely fixed, promptly inspect and repair defects such as pores and cracks, and avoid damage or deformation of the material structure due to improper operation. For example, if slag is found in the welding area when polishing stainless steel, it must be repaired before continuing polishing, otherwise subsequent processes may exacerbate the problem.
Summary: The core of the basic principles lies in gradually refining the processing, reasonably controlling the tool parameters, and ensuring the integrity of the workpiece. These principles together guarantee a smooth and undamaged surface after polishing.