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Technology
GmbH
HURTIG ®

HUR – TG7520 CNC thread grinding machine

HUR – TG7520 CNC thread grinding machine

Machine General Introduction

Machine application

This machine is a NC thread grinding machine developed specially for grinding precision thread gauges, able to grind internal threads and external threads on one machine.

General description

Work spindle rotating and table reciprocating are ganged/linked to achieve spiral movement.
Work table travels along V-and-flat guide ay (i.e. one guide way is V-located on the opposite end of wheelstock rotary drum).
The internal grinding wheel spindle adopts a high-speed (E-spindle) grinding wheel dressing by a diamond disc.

CNC system is SIEMENS 828D

These axes are all driven by SIEMENS servo motors Bearings of table ball screw and wheelstock feedings ball screw are from world-famous brands.

External threadsInternal threads
pitch is within 6mm:pitch is within 6mm:
pitch error:pitch error:
adjacent pitch: 0.003mmadjacent pitch: 0.003mm
in 25mm long: 0.005mmin 25mm long: 0.005mm
in 100mm long: 0.006mmin 100mm long: 0.006mm
in 300mm long: 0.009mmroundness: 0.005mm
in the full thread length: 0.011 mmsurface finish: Ra 0.4 um
half angle error: ±8‘
roundness:
φ<100mm,0.003m
φ≥100mm, 0.005mm
cylindricity: 0.008mm
surface finish: Ra 0.32 um

ItemParameter
max. job diameter:φ200
max. job length:500
external grinding diameter:Φ2-200mm
internal grinding diameter:Φ25-125mm
external grinding length:350mm
internal grinding length:75mm
center height:120mm
external pitch range:1-24mm
internal pitch range:0.5-6mm
external helix angle range:±30°
internal helix angle range:±6°
thread start number:1-99
table traverse speed (Z axis):0-3m/min (stepless)
wheelstock feeding speed (X axis):0-3m/min (stepless)
work spindle speed
grinding (Caxis):0.5-75r/min(stepless)
indexing::4r/min
system resolution
X. Z axis:0.001mm
C axis:0.001°
external wheel 0. D:Φ400-300mm
I.D.Φ203mm
thickness:10mm
internal wheel O.D:Φ20-50mm
thickness:6mm
wheel spindle speed
external:1650-2100rpm
internal:30000rpm
wheel linear speed
external grinding wheel:35-45m/s
internal grinding wheel:20-30m/s
max. job weight:25kg
machine dimension (LxWxH):2500*1800*1800mm
machine weight:6500kg