Main construction and equipment:★ MX-5000 High Accuracy CNC Vertical Grinder is a universal grinder with joint travel over 5axes by using Siemens 828D/840Dsl control system. It can grind ID, OD, endface, and surfaces of various raceways in a single clamping with consistently high perfection.
★ Standard construction of the machine is equipped with two columns and two grinding wheelheads. And a high accuracy NC rotating unit mounted on the left so that the vertical grinding spindle can rotate over an arbitrary angle . Another wheelhead can be equipped with a vertical grinding spindle or a horizontal grinding spindle.
★ The vertically reciprocating grinding spindles are subject to hydraulic balancing by an imported hydraulic balancing device so as to improve the stability of the movement and prolong the service life of the machine components. Automatic locking is provided for the grinding wheelheads in either power-on or power-off condition so as to prevent the grinding wheel from dropping and/or the grinding wheelhead downward slip due to gravity after power off during the grinding process.
★ In order to ensure the rigidity of the machine tool, the machine guides use the highly vibration-resistant roller-shaped linear rails of the German imported INA, with 3 sliders arranged on each side to enhance stiffness.
★ The ball screws of in-feed and reciprocating are imported by Japan NSK large diameter high precision ball screw.
★Automatic NC rotating unit imported by German, it provided for this machine featuring non-lifting turntable for continuous rotation and hydraulic clamping system. The rotating movement is realized by means of Siemens servo motor and OTT worm drive. The positioning is controlled by Heidenhain scale. This rotating unit is characterized by automatic swiveling over ± 50 degree, automatic positioning and automatic clamping.
★ MYL grinding spindle featuring high accuracy, high power and high rigidity is used as vertical grinding spindles which are directly driven by motors. Built-in auto dynamic balancing device and gap elimination device are provided. The horizontally arranged grinding spindle is a high accuracy belt-driven grinding spindle with poly-V belt.
★ Hydrostatic type work spindle is used which is radially supported by dually supported bearings to endure radial load and belt tension during grinding operation. The work spindle is axially supported by two axial bearings at upper and lower position. The upper bearing can support high loading capacity of the rotating table with a magnetic chuck and the lower bearing can control the floating amount of the work spindle. The work spindle is driven by imported precision reduction unit via unloading belt pulley. Frequency converters is used for rotating speed variation of the work spindle. The work spindle is characterized by high accuracy rotating, easy adjustment and convenient maintenance.
★ Close-loop control positioning by means of Heidenhain scale is available for X1, Z1, X2, Z2 axes.
★ According to user requirements equipped with single point diamond dresser, single-point radius dresser or form diamond wheel dresser.
★ Permanent electro-magnetic chuck with multi-slots is provided with raised poles for mounting supports of workpiece. The holding force of the chuck may be regulated according to the size of the workpiece. Additional pole reversing function and safety protection are provided against accident when the magnetic chuck is not magnetized are provided. With magnetizing or demagnetizing status display.
★ The machine can use a fully enclosed housing or a semi-enclosed housing.
★ Air conditioners may be equipped for the coolant tank, electric cabinet, oil tank and electric spindles according to the need of the user for controlling their temperature inside.
★ The machine adopts modular design so as to meet the technical requirements for different specifications.
It is suitable for grinding ID, OD, taper and endface of large wheels, gears etc. inner/outer raceways of extra-large bearing rings. All surfaces are ground in a single clamping so that the position accuracy of the work pieces such as the perpendicularity of ID to endface or the perpendicularity of raceway to the endface may be kept at a high accuracy. It is a new generation of grinding machine with high accuracy and high productivity suitable for mass and large batch production of wheels, gears and bearing races of the wind power generator.
Runout of ID/OD ≤ 0.005mm
Cylindricity of ID/OD ≤ 0.005/400mm
Flatness of endface ≤ 0.005/200mm
Surface roughness of ID/OD ≤ Ra 0.4μm
Surface roughness of endface ≤ Ra 0.4μm
Grinding diameter Ф2200 mmФ–Ф 5000 mm
Max. grinding depth 600 mm
Max. swing diameter of worktable Ф5200 mm
Stroke of horizontal slides on cross beam (X1, X2 ) 2700 mm
Stroke of vertical slide (Z1, Z2) 700 mm
Swivel angle of rotating unit (B) ±50°
Resolution of Axis X1, Z1, X2, Z2 0.001 mm
Work spindle speed 1 – 20 rpm
Total power 170 kW
Floor space of the machine 14x 7.5 meter
Machine weight 165000 kg