HORIZONTAL SPINDLE COMPOUND TABLE SURFACE GRINDING MACHINE OSH-400 (ORSHA -4080)

     The machine base is the bed on which compound slide, column, control panel, cross and vertical feeds mechanism are installed.
       Machine compound slide provides longitudinal and cross table travel.
     Column ensures vertical travel of wheel head.
      All working travels on machine are automated.
      Longitudinal table travel is realized by hydraulic cylinder.
    Automatic and rapid travel of compound slide is realized through the belt transmission from induction electric motor.
      Automatic vertical feed is realized from hydraulic motor through reducer and rapid travel is from induction electric motor through the belt transmission and reducer.
      Manual travel of compound slide, wheel head and table is executed by hand wheels.
       Spindle rotation is realized by induction electric motor.
       Machine hydraulic station is fulfilled as a separate unit and installed to the right from the machine.
        Machine control panel is located on the bracket which is fastened to the bed.             Cooling system unit is installed from the left side of machine. 
        COLUMN
       Column is mounted on the rear wall of the bed and serves for realization of vertical travels of wheel head which is installed and rigidly fastened on its top surface.
        Guide ways of surface are formed by column itself and the bars screwed onto the bed. Preload in system of vertical guide ways is achieved :
   - in the plane parallel to the grinding spindle axis  - by means of rigid bushings and force of disk springs;
  - in the plane perpendicular to the grinding spindle axis – at the expense of guide ways of V-shaped form use.
      Vertical travels worm-and-wheel gearbox is fastened to the lower plane of the column.
      LEFT CROSS GUIDE WAY
    Left linear slide roller bearing has U-shaped form in section, perceives vertical and side loads. For ensuring high rigidity and accuracy of cross travel of compound slide U-shaped guide way is assembled with preload which is created with wedge by means of the screw, then the wedge is fixed by the screws.
      COMPOUND SLIDE
    Compound slide ensures cross and longitudinal travel of table. Longitudinal linear bearings (V-shaped and flat ones) over which the table travels, is located on top plane of compound slide. Hydraulic cylinder of table drive is rigidly fastened between longitudinal guide ways.
    Bracket which is connected with the nut of ball-screw pair of cross feed mechanism is fastened to the lower surface of compound slide. The sliding bar over which table reverse cams travel is installed on the front wall of compound slide, under guard board. Tabs interacting with contactless switches located on table are installed on cams. Position of cams is adjusted depending on the length of machined part. Mechanism of table manual travel is fastened from the front, to the left on compound slide.
       TABLE
      Table has working surface with three Т-shaped slots for installation and fixation of machined parts, electromagnetic chuck or setting fixture. On lower plane of table the longitudinal slideway bearings -  V-shaped and flat ones are located and also toothed rack which provides the manual travel of table from the gear of manual travels mechanism . Brackets are stiffened over edges of lower table surface. Rods of hydraulic cylinder are connected to those brackets.  Protection of working zone is installed on top plane of the table.
      Collection of coolant takes place in the table bath, and discharge – through aperture in the rear wall of table into collector and further on to cooling tank.
        CROSS FEED MECHANISM
        Cross feed mechanism provides:
-  manual travel of compound slide;
-  automatic feed;
- rapid travels;
- hand wheel switching off by electromagnetic clutch during automatic travels of compound slide.
         WHEEL HEAD
     Wheel head consists of body and spindle. Spindle is installed on high precision radial-thrust bearings assembled with preload.
      Supporting thread end of rolling ball-screw pair of vertical travels is fastened rigidly to the lower surface of wheel head body.
        Special canals and labyrinths are made in flange with the purpose of providing the protection of  leading foot bearings.
         VERTICAL FEED MECHANISM
         Vertical feed mechanism provides:
- automatic vertical feed;
- manual rough and fine travel of wheel head;
- hand wheel switching off by electromagnetic clutch during automatic travels of wheel head.
        COOLING
     Cooling consists of welded tank on which electric pump for coolant and magnetic separator for coolant treatment from metal slime are installed. Slime is collected in a separate tank.
   Emulsion discharge from the table takes place through collector fastened on compound slide into the tray installed into magnetic separator.
            HYDRAULIC CYLINDER
      Hydraulic cylinder is installed on top surface of compound slide and realizes reciprocal motion of table. Hydraulic cylinder rods are fastened by nuts to table brackets. Rods are sealed by rubber glands.  Table braking by means of special cones is foreseen in the extreme positions of piston stroke.
       HYDRAULIC DRIVE STATION
      Hydraulic drive station is designed for providing reciprocal travel of table with adjustable speed, output of table into loading zone, vertical feed mechanism drive and realization of centralized automatic lubrication of guide ways.
Station works on clean mineral oils with kinematic  viscosity from 30 to 35 mm2/с (r/St) at temperature  40°C designed for hydraulic systems with antioxidant and wear-preventive additives.
   Recommended trademarks of oils: ИГЛ-18 ТУ 38.101413-78, ИГП-30 ТУ 38.10141З-78.
        LUBRICATION SYSTEM
    Lubrication system is designed for centralized lubrication of all guide ways from hydraulic system. It is switched on automatically when machine hydraulic drive is switched on.
      Oil enters the lubrication system from hydraulic drive station through filter with filtration accuracy of 25 mkm. Drainage of lubrication is discharged into a sediment box designed for oil cleaning before discharge into hydraulic station. Sediment box is equipped with a magnetic separator.