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Modular Crankshaft Balancing Machine

Crankshaft balancing is a processing step that is best left in the hands of experts due to the high level of know-how and experience that is required.

In addition to the specific features of the crankshaft - such as limited correction possibilities, and free forces and moments that are related to the shaft ever-increasing quality requirements and efficiency objectives must be considered and made compatible with one another.

Precision unbalance measurement techniques, complex correction calculations and state-of the art manufacturing technology must be brought together to achieve optimal results.

Because of continuous development, every crankshaft is different from the last so comparing manufacturing processes is impossible. The differences in design, manufacturing technique, successive processing steps and work-piece handling appear immense.

To bring together the seemingly contradictory objectives of quality, economy and efficiency, powerful and multi-faceted manufacturing methods that do not burden the economic limitations must be used.

Modular concept

Schenck RoTec has set up a consistent modular concept of individual system elements for high-production crankshaft balancing machines.

Unbalance and geometric measuring stations, correction units, work-piece handling systems and peripheral automation can be combined to optimally meet the respective production line requirements.

Whether it’s a compact manufacturing island, flexible plant with tangential gate or an integrated transfer line, every solution is designed using modular components. Thus various production capacity requirements, correction methods and manufacturing philosophies can be realized in a short time. In addition, the scale of production is guaranteed because the system can be extended later by further modules.

Machine series

  • 200 KBTK: This two-station machine is especially suited for mediumvolume production. It is operated as a manufacturing island and can be loaded manually or by hand-operated loading device.
  • 200 RBTK: This multi-station machine is used when high flexibility regarding functionality and integration with the production line is needed. It is ideal for large production volumes and is linked to the manufacturing line by a tangential loading gantry.
  • 200 TBTK: This in-line transfer machine is the correct solution when maximum productivity is required and the station will be directly integrated into the manufacturing line.
  • 200 SBTK: The basic concept is identical to the TBTK. By extension with suitable modules, crankshafts which will require a second correction step because of their high initial unbalance can also be balanced in this machine.

Correction methods

The classic method of unbalance correction in crankshafts is by drilling into the counterweights in predefined components and one or two correction steps. This method is fast, the control system required is relatively straightforward and the calculation of corrections by the measuring unit is relatively simple.
Weight-optimized polar correction methods require complex calculation methods, but on the other hand minimize the amount of weight removed. This saves not only material and tool costs but also increases the quality of the crankshaft. In addition the weight of the counterweights is retained, thus internal weight correction is improved and the result is an engine with less vibration and noise.
With optimized correction mostly sintered-carbide drills with aerosol minimum quantity lubrication, oil or emulsion internal high-pressure emulsion lubrication are used.
For both methods the corresponding correction modules are available.
Further information
Arrangement plan
Modules: M Unbalance measurement C Unbalance correction G Geometry measurement F Transport device A Place of deposit, out of tolerance L Loading and unloading

Mr. Chai Yoon Chong
Mr. Cheng Y.S.

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