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Combined surface & chamfer grinding machine 72/855

Item number: VT4-00216

The 72/855 is suitable for grinding of the lateral surfaces of squared mono- and multi crystalline silicon work pieces in the format 125 x 125 mm and 156 x 156 mm, with four parallelly arranged grinding aggregates (2x pre- and 2x fine grinding). Work piece lengths of 180 up to 500 mm can be processed.


The fully automatic machine excels by following advantages:

highly flexible machine concept for mono & multi Si

fully automatic machine concept

adaptive Grinding Process Control

automatic change of work piece format (125/156)

equipped with two loading zones for manual and fully automatic

loading, for instance with the  help of an industrial robot

geometric correction by parallel arrangement of grinding aggregates

very high repeatability

fully automatic pneumatic clamping and centering of work piece

squared ingot/brick can be processed without preparation

automatic wheel correction

high process stability

high machine availability  97% acc. to SEMI E10

automatic adjustment of grinding tools with block detection for

optimized cycle time by using high-resolution measuring systems

detection and evaluation of the work piece specific quality data

after grinding, for instance geometric measures, angularity etc.

high throughput, even when a high removal is achieved by using

4 grinding disks and separate pre- and fine grinding processes


Specifications surface / chamfer grinding:

arithmetical surface roughness Ra <= 0,1 µm¹ / 0,15 µm¹

average surface roughness Rz <= 1,0 µm¹ / 1,5 µm¹

geometric toleranzes +/-0,05 mm by process capability index


angularity 90° +/-0,05° / +/-0,1°



cycle time <= 12 minutes (incl. loading, truning and unloading)

rough size 157,00 mm x 157,00 mm x 300 mm

(width x height x length)

final size 156,00 mm x 156,00 mm x 300 mm

(width x height x length)

chamfer width of 2 mm



¹ sufrace quality depents on used grinding wheel diamond sizes

² In a long-term test with more than 1,000 workpieces we were able

to demonstrate that we deliver at a geometric tolerance of ±0.05 mm

(h/w), a process capability index (Cpk) of higher than or equal

1.67. This means that of more than 1,000,000 workpieces, less than

1 worpiece is outside the tolerance range.


Technical Details


  • grinding spindles (4 pieces) with air protected spindle bearings
  • infinitely variable grinding spindle drive (4 pieces) via AC-servo motor
  • linear axis (5 pieces) with ball screw drive via AC-servo motor
  • CPU Siemens S7/317
  • high end industrial PC with dual core processor
  • 15“ touch panel with HMI, visualisation based on WinCC flexible
  • integrated recipe management
  • high-resolution laser measuring sensors (2 pieces)
  • Optional: workpiece format 210 x 210 mm²
  • Optional: ARPAT – Arnold Remote Production Analysis Tool – machine internal MES
workpiece Width125 - 210 mm
workpiece Height125 - 210 mm
workpiece Length180 - 500 mm
workpiece Weight42 kg

Download this manual as PDF-Document.