Centerless grinding machine H-4520

workpiecehorizontalCNC

Introduction
The H Series is built around static pressure technology, offering high precision, low wear, and long-term stability to ensure consistent processing quality. The wheel spindle, regulating wheel spindle, and feeding axis (lower slide rail) are supported by a static pressure oil film, allowing for contact-free operation. This prevents mechanical wear and maintains high precision even during extended use.
Its high rigidity and damping characteristics effectively reduce vibration, enhancing stability and surface quality during machining. The minimum feed rate is as low as 0.0005 mm, ensuring excellent roundness, surface quality, and dimensional accuracy of the workpiece.

Capacity
Standard Grinding Range (dia.): Ø1 ~ Ø45 mm
Grinding Wheel (O.D. x width x I.D.): Ø455 x 205 x Ø228.6(7A) mm
Linear Velocity: 33 m/sec (45 m/sec)
Regulating Wheel (O.D. x width x I.D.): Ø255 x 205 x Ø127(7A) mm
R.W. Speed: 10 ~ 300 rpm
Max. Infeed Length: 200 mm

Machine Feature

• User-friendly operation system: Latest CNC technology with program edit for various component grinding applications; installable shortcuts and emergency stop on operation panel; flexible software for integration with various automatic loading/unloading systems; MITSUBISHI/FANUC/SIEMENS systems available.
• Rigid machine base: Machine structure made of high-quality Meehanite cast iron, heat treated and stress relieved before machining. Slides hardened by high frequency and precision ground for stability and wear resistance.
• Advantage of hydrostatic spindle and slide rail: No metal-to-metal abrasion, extremely low friction and low temperature rise during processing, high-pressure oil film suitable for high-speed rotation, ensuring rotation accuracy and long service life.
• Oil coolant system: Equipped with an oil cooler to maintain constant oil temperature and prevent spindle-related accuracy loss due to oil temperature changes.
• Accumulator for protection device: Special pressure accumulator design returns hydrostatic oil to the main shaft system during power loss to avoid damage from momentary loss of static pressure oil film.
• Hydrostatic guideway construction: R.W. lower slider (infeed axis) uses hydrostatic guideway for smooth, fast sliding, high precision feeding accuracy; lower feeding axis driven by servo motor with harmonic reducer to reduce backlash and increase torque; minimum manual micro-adjustment 0.001 mm and NC minimum 0.0005 mm.
• Stable grinding wheel auto dressing unit: Concave dovetail slideways and extra-large sideway for improved stability of the grinding wheel device.
• Dressing devices: Dressing structure made of special alloy cast iron, hydraulic-driven front and rear dressing (optional servo for profile dressing), variable dressing speed; R.W. dressing adjustable to component requirements.
• Axial combination for CNC series: Z-axis (G.W. vertical dressing), Y-axis (G.W. horizontal dressing), A-axis (R.W. vertical dressing), B-axis (R.W. horizontal dressing), C-axis (R.W. upper slide auto infeed), X-axis (R.W. lower slide auto infeed).

Accessories
Standard accessories

• Grinding Wheel and Flange x 1 set
• Regulating Wheel x 1 set
• Infeed Work Rest and Carbide Blade x 1 set
• Thrufeed Work Rest and Carbide Blade x 1 set
• Diamond Tools (2 pcs/set) x 1 set
• Electric System x 1 set
• Lubrication System (with oil coolant and accumulator) x 1 set
• Coolant System x 1 set
• Work Lamp x 1 set
• Tools (Leveling Pad) and Tool Box x 1 set

Optional accessories

• Wheel Balancing Stand & Arbor
• Profile Grinding Attachment
• Grinding Wheel Ionization Dressing Device
• Hydraulic Work Ejector (Infeed Grinding)
• Manual Feeder For Infeed Grinding (Up and Down)
• Auto. Loading Attachment (Thrufeed Grinding)
• Automatic Feeder (Thrufeed Grinding)
• Auto. Unloading Attachment (Thrufeed Grinding)
• V Type Supporter for Long Bar Grinding
• Auto. Loading and Unloading Attachment (Infeed Grinding)
• Vibratory Feeder (Thrufeed Grinding)
• Fully Splash Guard
• Magnetic Coolant Separator
• Paper Filter
• Hydro cyclone Coolant Separator
• Jig Crank for Grinding Wheel

Specification
Capacity
Standard Grinding Range (dia.): Ø1 ~ Ø45 mm
Max. Infeed Length: 200 mm
Auto. Infeed Min. Increment: 0.0005 mm
Grinding Wheel
Size (O.D. x width x I.D.): Ø455 x 205 x Ø228.6(7A) mm
Linear Velocity: 33 m/sec (45 m/sec)
Regulating Wheel
Size (O.D. x width x I.D.): Ø255 x 205 x Ø127(7A) mm
Speed: 10 ~ 300 rpm
Tilt Angle: +5° ~ -3°
Swivel Angle: ±5°
Hand wheel Graduation
Upper Slide Feed: 4 mm/rev. (0.05 mm/graduation)
Lower Slide Micro-Feed: 0.08 mm/rev. (0.001 mm/graduation)
Trimming Device: 2 mm/rev. (0.01 mm/graduation)
Drive Motors
Grinding Wheel: 7.5 kW (6P)
Regulating Wheel: 3.5 kW (servo motor)
Lower Slide Feed Motor (X-axis)(NC one axis): 1.0 kW
Lubrication Oil Pump: 1.5 kW
Coolant Pump: 0.18 kW
Lubrication Oil Chiller: 0.37 kW
Tank Capacities
Lubrication Oil Tank: 90 L
Coolant Tank: 160 L
Machine
Dimension (L x W x H): 3050 x 1710 x 2100 mm
Net Weight: 4300 kg

Caractéristiques / Spécifications techniques

• Model: H-4520-CNC
• Standard grinding diameter range: Ø1 ~ Ø45 mm
• Grinding wheel size: Ø455 x 205 x Ø228.6(7A) mm
• Regulating wheel size: Ø255 x 205 x Ø127(7A) mm
• Grinding wheel linear velocity: 33 m/sec (45 m/sec)
• Regulating wheel speed: 10 ~ 300 rpm
• Max. infeed length: 200 mm
• Auto. infeed minimum increment: 0.0005 mm
• Grinding wheel motor: 7.5 kW
• Regulating wheel motor: 3.5 kW (servo)
• Machine dimensions (L x W x H): 3050 x 1710 x 2100 mm
• Net weight: 4300 kg