Balancing Machines for Crank Shafts and Conrods

The machines for balancing and measuring the principal axis or the center of gravity of crankshafts and conrods in serial production are of modular design and are planned according to customer-specific requirements.

Depending on the requirements, they are designed as plain unbalance measuring machines without any correction, or they can be combined with an additional station that automatically corrects unbalance by drilling. The modular crankshaft balancing machines for serial production can be produced as single-station or multi-station machines with or without integrated automatic unbalance correction. The soft-bearing measuring machines do not require an expensive foundation and are not susceptible to external vibration noise. Special software optimally distributes the measured unbalance to the available correction planes and angular positions. For small series or as an audit machine, adapted universal balancing machine concepts are available that can also be equipped with a manual drilling correction system.

Machines for the mass-centering of crankshafts determine the principal axis of the cast or forged blank. Crankshafts that are balanced with reference to their principal axis exhibit a lower initial unbalance. This results in reduced cycle times for the subsequent balancing machine and to a more efficient process overall.

The position of the center of gravity of conrods is determined on conrod taring systems. Material removal by milling with automatic 3D deburring tools ensures that the center of gravity is in the defined range and that an engine with this conrod runs smoothly. Hofmann’s conrod taring systems feature a short cycle time.

Machines for Automatic Balancing of Crankshafts

Types: KHK21-BL1,  KHK21-BL1, KHK12-BL1, KHK21-BH2

These balancing machines are usually loaded with the aid of a loading gantry, have a modular structure and allow an extension that can be adjusted to the production conditions. They are designed to balance crankshafts in multiple correction planes in one or more steps.

Special features

  • Easy and fast retooling
  • Separate measuring and correction station (2-station machine) or combined measuring and correction station (single-station machine)
  • Maintenance-free and wear-free vibration sensors
  • Exact drilling depths due to tool touch detection
  • Tool breakage and wear monitoring
  • Minimum lubrication
  • Chip removal with exhaust mask directly on the tool
  • High-quality German drilling spindle
  • Tool management (99 tools)
  • Integrated statistics software
  • Automatic Machine Capability Studies

Applications

  • Final balancing of small passenger car crankshafts to large truck crankshafts of symmetrical and asymmetrical design
  • Automatic loading via loading gantry or robot

Balancing Machine for Crankshaft Mass Centering

Type ZHK21-AL1

Single-station measuring machine with machine cladding and two-part access door. The measuring system comes with servo drives (master/slave), axial and radial alignment system and maintenance-free sensors. The measuring frame is lockable, and the temporary resting position is linearly adjustable. The measuring drive is equipped with supporting V-blocks and tension levers, and weights to compensate asymmetrical parts can be mounted on disks. After the measuring process, the interlinked system enables the transmission of coordinates in X and Y components to the subsequent OP. Operation occurs from a 19“-touchscreen (manual functions of WIN CC and measuring computer operation (Windows®)).

Special features

  • Easy and fast retooling
  • Maintenance-free and wear-free vibration sensors
  • Control cabinet directly at machine
  • Integrated statistics software
  • Automatic Machine Capability Studies
  • Compact, space-saving design

Applications

  • Measurement of raw crankshafts, symmetrical and non-symmetrical versions
  • Automatic loading through loading gantry or robot; manual loading is likewise possible

Balancing Machine for Geometric Crankshaft Centering

Type UHK 12-ZM1

Single-station balancing machine with machine cladding. The measuring system consists of force-measuring, permanently calibrated bearing pedestals that feature an easy adjustment in T-slots and locking using an open-end wrench. For a new rotor type, only the correction planes and radii are to be entered in the measuring system. The measuring drive is implemented as a belt drive with asynchronous motor which is horizontally adjustable on linear guides. Operation is performed via a 19” touchscreen.

Special features

  • Suitable for raw and finished part measurement
  • Maintenance-free and wear-free measuring system
  • High productivity thanks to fast retooling
  • Direct output of the correction values for the subsequent balancing machine
  • Angle indexing display “Posiquick C” for precise transfer of correction position to rotor
  • Compact, space-saving design

Applications

  • Balancing of small and medium-sized crankshafts of symmetrical and asymmetrical design (with ring weights)
  • Single and serial production
  • Maintenance
  • R&D

Additional product information

Balancing Machines for Manual Balancing of Serial Crankshafts and V-Crankshafts

Types: UHK 12, UHK 16, UHK 19

Single-station balancing machine with sliding guard or guard fence. The measuring system consists of a frequency-controlled belt drive, maintenance-free measuring transducers and axially adjustable bearing pedestals with hardened measuring rollers and thrust stops. A lifting device to take up the drilling forces is available. The measuring drive is a belt drive. A drilling spindle arranged in the gantry performs the unbalance correction with a manual or an automated feed slide. The unit is manually supported by a line laser, positioned to the correction planes and clamped pneumatically. Operation occurs from a 19” touchscreen (manual functions of WIN CC and measuring computer operation (Windows®)).

Special feautures

  • Easy retooling, with bearing pedestals guided in T-slots
  • Easy operation due to intuitive operating concept
  • Economical operation (monitor with balancing data directly on the machine)
  • Maintenance-free and wear-free vibration sensors
  • Exact drilling depths through drill tip position teaching
  • Dry machining
  • Chip removal with exhaust mask and chip extraction
  • High-quality German drilling spindle
  • Tool management (99 tools)
  • Integrated statistics software
  • Automatic Machine Capability Studies

Applications

  • Final balancing of small passenger car crankshafts and large truck crankshafts of symmetrical and asymmetrical design (with mounted ring weights)
  • Manual loading

Additional product information

Balancing Machine for Conrod Taring

Type PHW

The type PHW measuring and taring machines are put together based on the required cycle time and the scope of performance (deburring, brushing). The full assembly enables the weighing and taring of both connecting rod end bores and deburring with a cycle time of approx. 4.8 seconds.

Special features

  • Integrated end bore measurement
  • Latest weighing technology
  • 1 to 2 milling stations (large and small bore end)
  • 1 to 2 deburring stations (planing process)
  • 1 to 2 brushing stations
  • All axes are NC-controlled
  • Complete housing with integrated sound abatement

Apllications

  • High-volume production of conrods for the automotive industry and its suppliers

Additional product information