Fully Automatic I.D. Centerless Stone Lapping Machine

for outer 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)
- Outer ring : OD 200 - 320 mm x Breadth 22 - 70 mm, Raceway curvature R 5 - 25 mm
(One cycle automatic)
- Outer ring : OD 200 - 400 mm x Breadth 22 - 70 mm, Raceway curvature R 5 - 25 mm

STK-400WT-A

Application

1) Deep Groove Ball Bearing

2) Angular ball bearing

Main Features

  • Centerless stone lapping machine for outer 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 outer ring

Machine Specifications

1) Work piece
Outer ring of four-point contact (gothic arc groove),
ball bearing,
single-row deep groove ball bearing,
single & double-row angular contact ball bearing,
angular thrust ball bearing,
2) Machining range
O.D. 200 - 320 mm (Fully automatic)
200 - 400 mm (One cycle automatic)
Width 22 - 70 mm
(Manual loading for below 22mm and over 70mm)
Curvature R 5 - R 25 mm
(Work piece of O.D. below150mm and of width over 50mm cannot be machined)
3) Work piece support system
O.D. roller centerless support or O.D. shoe centerless support system
4) Machining method
Infeed type, Plunge cut
5) Main spindle unit
Revolution Max. 960 rpm
Automatic multi-step change-over
Motor Inverter control
6) Stone oscillation 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
7) Work carrier slide unit
Work carrier shift system
Stroke 500 mm Hydraulic drive
8) Work pressure unit
Hydraulic drive
9) Stone head
Auto-slide system
Stone pressurization Electropneumatic regulator control,
Automatic multi-step change-over
10) Delivery unit inside M/C system
11) Machine size
(W)2,460×(D)1,380×(H)2,030 mm
12) Machine weight
4,000 Kg

Note : Specifications are subject to change without notice.