 Centreless
Grinding
We are able
to offer centreless grinding, both through-feed and plunge
grinding.
Through-Feed
Grinding: Can be utilised for bars, shafts, and other components. Parts of more than one diameter can be
ground using the through-feed process if the diameter being
ground is the largest diameter on the part and it comprises
the majority of the overall part length. If multiple diameters
need to be ground on the same part, this form of grinding
can often be combined with other grinding processes to carry
out the customer’s requirements efficiently and cost
effectively.
Plunge
Grinding: Is generally used for components that
require grinding up to a shoulder or a larger diameter. The
work-piece moves in axially between the grinding wheels,
stops for the grinding operation, and then moves out again.
Again this form of grinding offers the customer a cost effective,
efficient service.
Principle: The
principle of centreless grinding can be seen in the diagram
below. Two wheels are used, the larger one operating at regular
grinding speeds which does the actual grinding, and a smaller
regulating wheel. The regulating wheel revolves at a much slower
surface speed - usually around 50-200 ft/min, and controls
the rotation and longitudinal motion of the work piece. For
through-feed grinding, one or both wheels of the centreless
grinding machine are canted out of the horizontal plane, this
imparts a horizontal velocity to the work piece, so that outside
feed mechanisms are not necessary. The work piece is held against
the work-rest blade by the cutting forces exerted by the grinding
wheel and rotates at approximately the same surface speed as
that of the regulating wheel.
Grinding: The
grinding process is essentially quite simple. The component
is passed through the centreless grinder where approximately
25-50µm is removed. The wheels are reset and the component
passed through again. This process is repeated until the required
size or finish is achieved.
We have
the following machines enabling us to carry out centreless
grinding:
Cincinati
220/8 Centreless grinder up to 60mm dia. x 1800mm in length.
Estarta
301 Centreless grinder up to 25mm dia. x 350mm in length.
With our
fully trained grinding technicians we can provide a complete
hassle free reclamation service if required.You
provide
us with a worn component a we will return it back to ready
for re-fitting or re-assembly. Alternately we can just
carry out
sub-contract grinding of un plated / metalsprayed items.
In both cases we provide excellent surface finishes extremely
tight limits
as required.
If you
think you may have a requirement of our services do not hesitate
to contact us.
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