CNC Grinding
Gear CNC Grinding Process
ID grinding, OD grinding, Surface grinding all belong to CNC grinding which are the foundational precision abrasive machining processes used to achieve exceptional dimensional accuracy and surface finishes, especially on hardened materials. They are not used to create gear teeth directly but are absolutely essential for preparing accurate blanks and, most importantly, for finishing the critical mounting and datum surfaces (bore and OD) of a hardened gear to the micron-level precision required for smooth, quiet, and reliable operation in a power transmission system.
ID Grinding
ID Grinding is called Internal Cylindrical Grinding, which is used to finish the internal cylindrical surface (a hole) of a workpiece to precise diameter, roundness, and surface finish. ID grinding is the only practical way to achieve micron-level accuracy and fine finish on hardened, small-to-medium diameter holes. This process is used for finishing the bore (center hole) of gears after heat treatment that is a critical operation for gear quality, as the bore is the primary mounting and locating feature.
OD Grinding
OD Grinding is also called External Cylindrical Grinding, which is used to finish the external cylindrical surface of a gear to precise diameter, roundness, and surface finish. There are two types of OD grinding :
1. Plunge Grinding: The wheel is fed straight into the part to grind a specific length (e.g., a bearing seat).
2. Traverse Grinding: The wheel or workpiece moves axially to grind a longer length than the wheel width. The process is in order to achieve excellent for achieving tight geometric tolerances (roundness, cylindricity) and size control especially for finishing gear shafts, pinion diameters, bearing journals, and the outside diameter of gear blanks prior to tooth cutting.
Surface Grinding
Surface Grinding is in order to create a flat, precise surface on a workpiece. This process is to hold the workpiece on a magnetic chuck (for ferromagnetic materials) or fixture. A horizontal spindle rotates a disk-shaped grinding wheel. The wheel is fed down incrementally (downfeed) while the table moves the workpiece back and forth (traverse) beneath it. The surface grinding could achieve exceptional flatness and parallelism between two face, a fine and consistent finish.
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