Drilling
In the field of Paper Industry rolls,  the word "drilling"   identifies the specific realization of through holes on suction rolls and blind drilling of press rolls.
 
For these operations, RIF has at its disposal specially designed and manufactured machines, among which: 
 
TRADITIONAL MULTIPLE SPINDLE  MACHINES TYPE "TWIST-DRILLING", custom-built for the  following processing:  
  • Drilling of polymer coverings for suction rolls and blind drilling;   
  • Mechanical clean-drilling of suction rolls, to the purpose of totally removing any foreign matters  deposited within the holes of the shells, if not removable with any other means;
  • Lengthening of the drilled length on used suction shells.
 
Besides the  machining, RIF drilling service is implemented  by some important accessory operations like: 
  • Total checkout of drilled face with the aim to single out any defects, anomalies, presence of bits of broken drills  originated during previous machining; 
  • Extraction of bits of broken drills in all cases when they were existing on the shell "GUN DRILL " CNC MULTIPLE SPINDLE DRILLING MACHINE, dedicated to the drilling and countersinking of holes of new metal shells, in bronze, stainless steel, carbon steel and cast iron.
Gun drilling is the most reliable and precise technology for drilling of new bronze and stainless steel suction shells: in particular it is the only technology able to grant a superior drilling quality for high thickness suction shells, in our case until 120 mm wall thickness. The quality of drilling, especially for suction shells subject to severe operating conditions, does not only translate into a geometrical or visual factor, but is of paramount importance for the stability of the shell and to ensure the absence of defects which might jeopardize the integrity of the shell itself over time.
 
The main distinctive features of gun-drilling are:
  • Internal forced lubrication through the drilling tools;
  • Use of highly wear-resistant cutters;
  • Extreme precision of  tool guiding and feed;
  • Controlled working temperature;
  • Continuous monitoring of every single drilling tool
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