SURFACE GRINDING MACHINE WITH ROUND TABLE AND HORIZONTAL SPINDLE OSH-641 WITH CNC

   Machine arrangement
  Column travels over guide ways of the base on Т-shaped bed consisting of two cast rigidly joined between each other parts – bed and base. Round table and table drive mechanism with reduction gear are located on the top plane of bed in its borings. Wheel head travels over vertical guide ways of column, travel is realized from reduction gear fastened on the column top supporting plane.
  Grinding wheel dressing is realized by rotating diamond roller of rotary dressing mechanism which is fastened on  horizontal pad in the left corner in niche of the rear part of the bed.
   From behind to the left of the bed the tank of coolant-lubricant feed system is installed, to the right from it there is a hydraulic station and to the right of hydraulic station there is an electric cabinet. Control desk is located to the right in front of the machine and is fastened with possibility of its turning.
   Round table
   Table face plate with diameter 1200 mm bases by lower supporting circular  plane when rotating on circular guide way of table body, so, in such a way the end circular plain slideway is created. Lubricating material  is supplied under adjustable pressure for decreasing the sliding friction  and providing uniformity of rotation of face plate  between rubbing surfaces  (mode of “boundary friction” is achieved).
   Face plate is connected with spindle by flat elastic disc which is fastened on spindle and centres face plate relative to spindle. Face plate receives drive  from servo drive through gear belt drive and reduction gear of the firm “Wittenstein alpha”.
   Electromagnetic chuck is installed on the top end surface of face plate  for fastening  the machined parts. Collector of voltage supply to electromagnetic chuck is fastened at the bottom on spindle.
   Wheel head.
   Wheel head spindle rotation axis has a horizontal arrangement (parallel to table face plate face).
  Wheel head body on closed linear slide roller bearing units travels over vertical guide ways (file-hard bars, V- shaped  and flat ones) of column. Head travel drive  is from programmable drive of the firm Siemens providing vertical feed of head with discreteness 1 mkm through reduction gear  installed  on top the column.
  Vertical feed of grinding wheel on cutting-in can be realized  in automatic mode (with setting the parameters of mode from machine control desk) as well as in manual mode by means of electronic hand wheel.
  Spindle bases on precision  radial - thrust bearings. 
   Spindle rotation is realized from electric motor through torsion coupling.
     Column.
   Column travels in cross direction on closed roller linear guide ways fastened on the base.
 Column travel drive is from programmable drive of the firm  Siemens through belt transmission onto rolling screw-nut.
    Column cross travel can be realized  in automatic mode with setting the parameters of mode from machine control desk or manually  by means of electronic hand wheel.
      Vertical feed mechanism.
  Vertical feed mechanism realizes vertical travel of wheel head and is fastened on upper surface of column.  
    Mechanism consists of electric motor installed on body  and coupling connecting electric motor with reduction gear.
    Grinding wheel housing.
  Grinding wheel housing is executed welded from sheet metal according to the requirements of safety measures norms as per GOST 12.3.028.
   Micro switch blocking grinding wheel rotation when the cover is open is installed under front housing cover.
      Grinding wheel flanges.
   Grinding wheel is installed between flange and face plate through gaskets which are tightened by screws.
    Grinding wheel balancing is realized by travel of balance weights in the slot of the first flange.
    Removal of grinding wheel from spindle taper is produced by the screw М24 which rests into the face plate nut by its face when unscrewing it and removes grinding wheel together with flanges.
      Dressing mechanism
    Dressing mechanism is arranged on the pad from behind   -to the left from bed.
   Grinding wheel dressing is realized during setting the bracket with block of dressing by hydraulic cylinder into working position at which dressing block spindle axis is parallel to grinding spindle axis.  Grinding wheel travels relative to  rotating  but coordinate immovable  diamond roller. As grinding wheel can travel simultaneously over two coordinates (Y and Z), then it can be dressed over periphery as well as over face.
         Control system
- Control system – Sinumeric 828D of the firm “Siemens’;
- Feeds electric drives – servo drives Sinamics of the firm “Siemens”;
- Low voltage equipment of the firm “Siemens”;
-  Limit switches of the firm “Balluff”;
- Feedback of travels over axes Y, Z control is realized by photo pulse converters of the firm “Fagor”.