Fully Automatic Centerless Stone Lapping Machine for inner rings of ball bearings

for inner ring raceway of four-point contact (gothic arc groove), single-row deep groove and angular contact ball bearings, and doubel-row angular ball bearings

Standard application range :
(Full automatic)
- Inner ring : OD 120 - 260 mm x Breadth 22 - 70 mm, Raceway curvature R 5 - 25 mm
(One cycle automatic)
- Inner ring : OD 120 - 320 mm x Breadth 22 - 70 mm, Raceway curvature R 5 - 25 mm

STK-400WT-B

Application

1) Deep Groove Ball Bearing

2) Angular ball bearing

Main Features

  • Centerless stone lapping machine for inner ring raceways of ball bearings
  • Infeed machining with plunge grinding. Inner diameter shoe, roller centerless support system.
  • Equipped with direct-drive system in which oscillation arm is directly driven by AC servomotor
  • The servomotor is driven with the latest control program, and oscillating stone head oscillates moves in smooth, sine-like curves. Backlash caused by conventional cam-type machines has been eliminated, and vibration has been minimized even at the high-frequency oscillation, achieving high-precision stone lapping. Additionally, the direct-drive system allows for angle settings and oscillating axis center position adjustment at the time of changeover to be performed easily by entering the work dimensions from the touch screen.
  • Indexing of precise oscillation angles allows machining of gothic arc grooves with high precision, something which has been difficult until now
  • Fully automatic stone lapping machine with work carrier slide unit

Work piece: Ball Bearing Inner Ring

Machine Specifications

1) Work piece
for outer ring raceway of four-point contact(gothic arc groove),
single-row deep groove and angular contact ball bearing,
and double-row angular ball bearings
2) Machining range
O.D. 120 - 260 mm (Fully automatic)
120 - 320 mm (One cycle automatic)
Width 22 - 70 mm
(Manual loading for below 22mm and over 70mm)
Curvature R 5 - R 25 mm
3) Work piece support system
I.D. shoe centerless support system
4) Main spindle unit
Revolution Max. 870 rpm
Automatic multi-step change-over
Motor Inverter control
5) Oscillation unit part
Oscillation unit Setting of oscillating frequency, oscillating angle, oscillating angle center is to be conducted through touch panel.
Stone oscillating axis Directly driven by AC servomotor
Oscillation frequency Max. 500 fpm (±20°)
Automatic multi-step change-over
Drive Motor AC servomotor
Tool in/out slide unit Axial direction positioning device
Drive Motor Servomotor
Approach slide unit Radial direction positioning device
Drive Motor Servomotor
6) Work carrier slide unit
Work carrier shift system
Stroke 500 mm Hydraulic drive
7) Work pressure unit
Hydraulic drive
8) Stone head
Auto-slide system
Stone pressurization Electropneumatic regulator control,
Automatic multi-step change-over
Setting pressure Direct entry at touch panel
9) Delivery unit inside M/C system
10) Machine size
(W)2,460×(D)1,880×(H)1,980 mm
11) Machine weight
4,000 Kg

Note : Specifications are subject to change without notice.