Circular workpieces can warp after machining due to several reasons such as uneven cooling, residual stresses, and improper machining techniques.
Uneven cooling can occur when the workpiece is not cooled down uniformly after machining. This can cause the surface of the workpiece to contract at different rates, leading to warping.
Residual stresses can also cause warping. When a workpiece is machined, stresses are introduced into it, which can cause it to warp over time. This is more common in materials like steel, which has a high tendency to retain stresses.
Improper machining techniques can also cause warping. For instance, if the tool used to machine the workpiece is not properly aligned, it can create uneven pressure on the surface of the workpiece, leading to warping.
To prevent warping of circular workpieces after machining, it is essential to use proper machining techniques, employ cooling techniques that ensure uniform cooling, and reduce residual stresses. It is also necessary to use high-quality materials that have low tendencies to retain stresses.