INTERNAL GRINDING (ID GRINDING)

According to the grinding methods, it is classifiedas follows:
1. Internal grinder: The workpiece is chucked and rotating.
2. Jig grinder: The workpiece is chucked but not rotating.

Internal grinding is used to meet the following requirements simultaneously.
◆ Consistent bore diameter
◆ Roundness
◆ Cylindricity
◆ Roughness

Depending on different materials of workpiece, different abrasives should be selected.Especially for hardened steels such as SKD11, HSS, SKD61, SCM21, SCM400 series, and SUS400 series, if used on high rigidity grinding machines operating at surface speed ≥45m/s , the following objectives can be attained simultaneously.

• High Cpk for size precision
• Long dressing interval
• Consistent roundness & cylindricity
• Short cycle time

In accordance with the workpiece shapes, there are the following 3 types:
1. Through hole: Wheel can pass through the internal hole of workpiece freely.
2. Blind hole: Wheel can only pass one side of the internal hole of workpiece.
3. Face: The face of workpiece sometimes has to be ground.