In these latter cases, there is often an argument as
to whether marks can or cannot be seen in the finished surface of the
rolls. To settle these issues, UNIVIB uses its Chatter_Detect system to
provide a quantitative assessment of the surface quality of finished rolls
and thus to settle the argument.
This system is capable of detecting grinder chater with a marking deoth as small as 0.05 µm these being invisible to the naked eye. Note that the system is also available for purchase as a product See our Chatter_Detect page for more details.
Our investigation of a roll grinder chatter vibration problem is normally carried out in two phases: first the vibration occurring while grinding is measured and analysed and any sources of forced vibration (from motor imbalance, bearing defects, belt - flap for example) are traced.
Over the last 20 years or so, UNIVIB engineers have investigated the vibration behaviour of around 150 different roll grinding machines around the world, as can be seen from our reference list. In many cases the motive for the investigation has been the troubleshooting of a specific problem of grinder chatter - regular marks in the surface of the roll. In other cases, the investigation has been carried out as part of a mill chatter study, in which the grinder has become a "suspect" in the search for possible causes of a strip marking problem at the mill.