Surface grinding machine ETLS-200400NC

for large workpiecescolumn typewith magnetic chuck

Overview
ETLS-200400NC twin heads double column type surface and slideway grinder designed for high rigidity, stability and durable heavy-duty grinding applications. Integrates twin heads, double-column structure and slideway grinding capabilities for large workpieces.

Structure
High strength casting iron (HT300) with tempering treatment is utilized to ensure rigidity, stability and durability. A fixed cross beam structure combines the beam and columns into one sturdy door shape to guarantee machine solidity.

Movements
Large twin V is adopted on the machine base and work-table railways to allow rock-steady table movements and maintain best alignment and equilibrium. Grinding head vertical and longitudinal travel are guided by high-precision grade ball-screws and driven by Baldor AC servo motors (PNC type) for accurate positioning and micron-precise feeding. Grinding head cross travel moves on high density strength steel (S55C) with ultra precision grade linear roller bearings for firm and smooth cross travel and accurate cutting ability. Angular turn on the vertical grinding head is driven by an AC servo motor on worm shaft transmission; numerical insert on desired angle with accuracy to 0.1° allows swift angle forming grinding.

Spindle & Motor set
High precision in-house assembled cartridge-type spindle set uses six super-precision CP4 grade angular ball bearings, sealed with permanent lubrication for low noise, low heat rise and high precision. Japanese brand V3 grade high torque spindle motors are utilized and are tested with kinetic balance inspections; integrated with spindle via couplings for direct transmission to obtain maximum torque and reduce vibration.

Lubrication
Force coverage lubrication (oil streams down from upper to lower machine base railways) avoids impacts from lubricant oil pulsation pressure and allows smooth movements. A detecting sensor will disable table movement to protect the railways when lubrication oil pressure is abnormal.

Hydraulic system
Employs precise electrical circuit to control the proportional hydraulic valve. Operator can adjust work table speed directly via control panel to increase work efficiency. Hydraulic tank temperature is maintained by Habor Coolant system to stabilize oil temperature after long hours of operation to guarantee grinding precision and protect hydraulic system parts.

Control System (PNC type)
DSC-based NC control system integrates all functions and movements into one panel. Numerical control utilizes AC servo motors on both vertical feed and cross feed. LCD screen display with digital inputs on the panel allows easy operation across various grinding applications. The system is designed for easy maneuvering and user-friendly operation without requiring complex programming.

Technical specifications

• Main item: Twin heads double column type surface and slideway grinder
• Model variants / Unit: 200400 / 250600 ; 200800 / 250800
• Electromagnet table size (x*y): 4000/6000 x 2000/2500 ; 8000 x 2000/2500
• Left and right X axis travel: 4200 / 6200 ; 8200
• Max center of wheel to table: 650 mm
• Two column passed maximum workpiece size (mm): 2560 / 3060
• Worktable maximum loading capacity: 8000 / 9000 kg ; 10000 kg
• Worktable feed speed: 5-30 m/min
• Table T-slot specification: 18 x 8 / 18 x 10 (mm * n)
• Surface grinding head - Grinding wheel max size: OD500 x 203 x 50-75 mm
• Surface grinding head - Spindle motor (HP*P): 25 x 4
• Surface grinding head - (50Hz) Grinding wheel speed: 1450 RPM
• Slideway head - Grinding wheel max size: 350 x 127 x 40 mm
• Slideway head - Rotation angle: Left 90°, Right 90°
• Slideway head - Spindle motor (HP*P): 7.5 x 4
• Slideway head - Positive and negative rotation (option) RPM: 0-1500
• Height of machine (move to top height): ≈3500 / 3900 mm
• Layout floor space (L x W): 12000 / 15000 x 5000 mm ; 18100 x 5000 mm
• Weight: ≈42000 / 70000 kg ; ≈73000 / 83000 kg