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Balancing Machine for Crankshafts 320 SBRK-C, 520 SBRK-C, 720 SBRK-C - Schenck in Philipines

  • Fully automatic balancing of crankshafts
  • Digital measurement processing and optimizedcorrection calculation
  • NC axis control for unbalance correction
  • High-speed drilling with drill lubricant or minimum quantity lubrication
  • Interfacing with loading gantryis possible

Sequence of operations

  • Manually or automatically load the crankshaft
  • Close the protective door and start the automatic measuring run:
  • Lower the crank into sleeve shells, close the counter bearing, measuring run, drill the correction holes, check run, open the counter bearing, index to the home position, lift
  • Open the protective door and unload

Special features

Measurement and correction of unbalance in the same station; hence less rotor handling.
The vibrating frame with multiple journal bearings provides measurement under conditions similar to operating conditions, less surface loading when drilling and is gentle on main crank journals.
Drilling with coolant shortens drilling time and improves tool life.
Design

Range of application

Measurement and correction of unbalance of machined passengervehicle and commercial-vehicle crankshafts. Use of the machine in mid-volume production. Unbalance correction by drilling into the counterweights in one or more correction steps.

Design

Single-station machine with stable balancing frame and hydro-dynamic support pedestals. Hook-drive for
driving the crankshaft at the crankpin. Rear-inclined drill gantry with NC-controlled carriage-drill unit.
Indexing the crankshaft, displacement of the drill unit and control of drilling depth by the microprocessorcontrolled measuring unit.
Technical data
Technical data at a glance    320 SBRK  520 SBRK  520 SBRK-2  720 SBRK   
Measuring unit    CAB 950  CAB 950  CAB 950  CAB 950   
Passenger car crankshafts    •         
Light commercial vehicle crankshafts    •  •  •     
Truck crankshafts      •  •  •   
Asymmetrical crankshafts    •  •  •  •   
Sleeve bearing and hook driver    •  •  •  •   
NC controlled drill unit    •  •  •  •   
Minimum quantity lubrication    •  •  •  •   
Swarf conveyor    •  •  •  •   
Crankshaft             
Weight, max. 1)  [kg]  8-40  30-100  30-160  80 - 350   
Overall length  [mm]  350-790  500-1000  500-1400  800 - 2500   
Bearing distance max.  [mm]  240-660  350-750  350-1100     
Distance between correction planes  [mm]  200-600  300-700  300-1050  800 - 2250   
Main journal diameter  [mm]  40-80  65-125  65-125  80 - 160   
Outside diameter  [mm]  120-200  160-310  160-310  80 - 400   
Crank pin diameter  [mm]  30-60  50-90  50-90     
Stroke  [mm]  55-95  100-160  100-160     
Machine             
Width A 4)  [mm]  3750  3750  3750  4950   
Depth B 4)  [mm]  2200  2200  2200  2200   
Height C 4)  [mm]  2300  2300  2300  2300   
Balancing speed  [min -1]  400  265  265  300   
Measurement uncertainty 2)  [gmm]  20 - 30  30 - 80  30 - 80  20 - 30   
Cycle time 3)  [s]  90 - 300  90 - 300  90 - 300  90 - 300   
Air pressure  [kPa]  600  600  600  600   
Power consumption  [kVA]  8  10  10  10   
             
Basic machine  Order No.  R0280200.01  R0280300.01  R0280400.01  R0280100.01   
Options             
2 spindle drilling unit  Order No.  R0280206.01  R0280306.01  R0280406.01  R0280106.01   
Lifting device 5)  Order No.  R0280203.01  R0280303.01  R0280403.01  R0280103.01   
Drill wear monitoring  Order No.  R0280205.01  R0280305.01  R0280405.01  R0280105.01   
High-pressure inside cooling 16 bar  Order No.  R0280201.01  R0280301.01  R0280401.01  R0280101.01   
Coolant conditioning system, fineness 30 µm  Order No.  R0280202.01  R0280302.01  R0280402.01  R0280102.01   
             
1) Without bob weighs, with manual loading max. 15kg             
2) Acc. to DIN 1319, 95% probability, dependent on work-piece (without uncoupling or unloading)             
3) Minimum achievable cycle times, depending on crankshaft design             
4) Plus control cabinet, chip conveyor and optional coolant condition. Data non-binding, depending on equipment supplied             
5) For loading by means of lifting device