MK7140B CNC Surface Grinder

Background

4-meter-class long guideways are the core structural components of large linear motion systems. Flatness and parallelism of the mounting face, raceways, and datum surfaces directly determine assembly accuracy and operational stability. Key challenges include: • Ultra-long accuracy control: guideways exceed 4000 mm; full-length flatness is hard to hold, and conventional sequential processing accumulates error • High batch throughput: batch production demands tight size consistency while maintaining efficiency—hard for conventional machines to balance • Large-workpiece clamping stability: clamping deformation of long workpieces must be controlled, requiring even suction and low distortion from the electric permanent-magnet chuck • Complex multi-process sequencing: rough → semi-finish → finish cycles need precise handoffs, demanding robust program control and automatic compensation The MK7140B's column-moving structure and servo-controlled grinding cycles deliver a one-stop solution for precision flat grinding of 4-meter-class long guideways.

Solution

A column-moving, horizontal-spindle reciprocating-table surface grinder. Vertical and cross feeds of the wheel head, together with wheel dressing, are servo-controlled for automatic grinding with rough, semi-finish, and finish cycles, plus automatic wheel dressing and wheel-wear compensation. The horizontal spindle and rectangular electromagnetic table grind flat workpieces with the wheel periphery; the table is driven by rack & pinion left/right for smooth, stepless, high-efficiency travel with excellent surface finish and grinding accuracy.

Scenarios

• 4-meter long guideway precision grinding: mount face and datum ground in one setup, avoiding segment-machining witness marks
• Rough → semi-finish → finish automatic cycles: at least rough, finish, and spark-out stages with analog-controlled sized grinding
• Large-table batch machining: 4200 × 420 mm electric permanent-magnet chuck with even suction and easy clamping

Advantages

• ✓ Ultra-long travel for 4-meter rails: max grinding size 4200 × 400 × 400 mm, table travel 4500 mm—full-length grinding of 4-meter guideways in one setup
• ✓ Servo-controlled grinding cycles: vertical/cross feeds and wheel dressing servo-driven; rough, semi-finish, finish auto-sequenced with wheel-wear compensation
• ✓ Rigid low-stress bed: high-strength low-stress cast iron, properly aged, hand-scraped contact surfaces—high strength, low damping, high vibration resistance
• ✓ Premium sleeve-type spindle: high-grade sleeve spindle; wheel-head carrier moves along the column guideways and auto-dresses for higher productivity
• ✓ Smooth rack & pinion drive: left/right table drive with stepless speed (3–28 m/min) for high grinding efficiency
• ✓ Fully enclosed guarding: full enclosure with reliable sealing against coolant ingress—no leakage