Dressing grinding wheels with form rolls

In form roll dressing, the dressing roll has the same profile geometry as the workpiece to be ground. Straight and inclined grooves are distributed unevenly around the circumference of the roll:

• The groove width is 1.5 to 2.5 mm; the groove depth must be at least 2.5 mm below the lowest point of the form profile.
• The grooves act as cutting edges and at the same time accommodate the detached abrasive grains.
• Steel inserts are embedded in one or two straight grooves at an angle of 10° to 15° to the roll axis. After fine dressing, these inserts are formed along with the profile and can be used to check the ground profile and the form grinding wheel.
• The usual roll diameter is Φ50–60 mm.

Design of the dressing tool

The dressing tool essentially consists of two centres that are driven by an electric motor via a belt drive or gear transmission. As the roll is pressed increasingly against the grinding wheel, the wheel receives the desired shape under pressure.

Installation and alignment

The dressing tool is mounted on the magnetic chuck of the surface grinding machine. Important: the axis of the dressing roll must be aligned parallel to the axis of the grinding wheel.

Additional: diamond dressing with template

For profile correction, a dressing roll and a diamond dressing tool can also be used together on a surface grinding machine. The diamond needle is guided via a template. A follower ensures that the diamond needle and the roll rotate by the same angle – so even difficult-to-access profile areas can be cleanly formed.