The contact area between the grinding wheel and the workpiece is large, and the grinding efficiency is high. However, it generates a lot of heat, and it is not easy to spread and cool, so the quality of the face grinding method is lower than that of the circumferential grinding method.
When grinding a tapered surface, the axis of the workpiece must be deflected by a taper angle relative to the axis of the grinding wheel. Grinding the outer conical surface is usually carried out on a cylindrical grinding machine.
When grinding the outer conical surface with a large taper angle, use the method of turning the headstock or the grinding wheels holder for grinding. When grinding the outer conical surface with a small taper angle, the method of rotating the table can also be used for grinding.
When grinding the inner conical surface, use an internal grinding head on an internal grinding machine or a universal external grinding machine. The grinding method is basically the same as grinding the outer cone.
Grinding the inner circle is usually carried out with an internal grinding head on an internal grinding machine or a universal cylindrical grinding machine. When grinding the inner circle, the clamping of the workpiece generally adopts a three-jaw or four-jaw chuck. Use the end face and outer edge of the workpiece as a positioning reference for clamping. Among them, the four-jaw chuck is used more to clamp the workpiece by aligning.
Due to the small diameter of the grinding wheel used for grinding the inner circle. Although its rotational speed is very high (generally 10,000 to 20,000 revolutions per minute), the cutting speed (linear speed “”] is still lower than that when grinding the outer circle. It is not easy to improve the surface quality of the workpiece. When the grinding wheel is round, the protruding length of the grinding wheel is long, the grinding wheel shaft is thin, and the rigidity is poor. It is easy to produce bending deformation and vibration during grinding, so the cutting amount should be lower. Also, when grinding the inner wall, more heat is produced. The cooling and chip removal conditions are poor, the workpiece is easy to heat and deform, and the grinding wheel is easy to block. Therefore, the productivity of grinding the inner circle is low, and the processing quality is also worse than that of grinding the outer circle.
Because the surface grinder is divided into vertical shaft type and horizontal shaft type. Therefore, surface grinding methods are also divided into two types: elemental grinding and end-face grinding.
Circumferential grinding is to use the circumferential surface of the grinding wheel to grind. When grinding the plane with the circular grinding method, the contact area between the grinding wheel and the workpiece is small. Low heat generation and good chip evacuation and cooling conditions. Therefore, the heating deformation of the workpiece is small, and the circumferential surface of the grinding wheel is ground evenly. It can obtain high processing quality and is suitable for grinding thin workpieces that are prone to warping and deformation. But circumferential grinding is less productive and is only used for fine grinding.
Face grinding is to use the end face of the grinding wheel for grinding. When face grinding, the extension of the grinding wheel shaft is short. And it is mainly subjected to axial force, so it has good rigidity. A larger amount of grinding can be used.