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Flange and Spindle Type Balancing Heads

BALANCING HEADS

The balancing heads are one of the components of the automatic balancing system on grinding spindles that perform the correction of the imbalance. The imbalance is due to different factors linked to the rotating masses, amongst which the geometric deviation of the grinder and the lack of homogeneity of the materials.

The balancing is performed with a system that combines mechanics, electronics and software. 

The wide range of balancing heads can be applied to grinding machines for internal or external grinding, grinding without centres, grinding for planes, grinding for gears or tools, resolving the most disparate application problems.

DESCRIPTION

There are three types of balancing heads:

  • Flange (FT): installed on the grinding wheel, outside the spindle. They are usually used on simple and economical grinding machines, without the automatic grinding wheel change. They are very easy to install and therefore ideal for retrofitting and they can be fitted with an acoustic sensor to check the grinding process.
  • Spindle(ST): built-in and they operate inside the spindle. They are usually used on top of the range grinding machines with front spindle, that operate at high and extremely high speeds, and therefore require an increased balance between the grinding wheel and spindle centre of gravity.
    The range allows for a composition of diameters and lengths to achieve the balancing capacity. The balancing heads inside the spindle are fitted with a built-in acoustic sensor that allows maximum sensitivity and response time. Furthermore flange or expansion self-locking systems are available to lock them to the spindle.
  • Hydraulic (HT): installed on the grinding wheel support flange. They are usually used on grinding machines with automatic grinding wheel change and spindles that do not allow standard balancing heads to be used. In these types of heads the imbalance is compensated by injecting coolant, or oil in three or four balancing chambers that are integrated in the balancing container or directly in the grinding wheel flange. The balancing container is available in different shapes to meet the customer's requirements. They are very easy to install, making them ideal for retrofitting on grinding machines that do not have an automatic balancing system.

The FT and ST balancing heads can be connected to the following systems:

 

P1dWB   P7WB   DS5000   DS6000   DS7000

 

BENEFITS
  • Correction of the imbalance
  • Faster imbalance correction times
  • Compensation on one or two planes
  • Increased geometric and dimensional finish quality of the machined part 
  • Extended life of the machine's rotary components: spindle, grinding wheel, dresser
TECH SPECS
  • Balancing capacity: from 1 to 8000 grcm
  • Rotation speed: up to 30000 RPM
  • Integrable acoustic sensor
VERSIONS

The versions available, of balancing heads with external and internal spindle installation, meet the most disparate application requirements:

  • Balancing heads with retractable contact (FTR): the automatic electromechanical balancing is performed thanks to motors that move the masses in the balancing position. The motors are driven with a retracted brushes transmission system whose contacts are closed only during the balancing. The balancing head system consists of a single component and therefore does not require any support for the transmitter
  • Balancing heads with contactless transmission (FTC): the balancing is performed by the inductive movement of the motors. The power and the logic signals for managing the balancing cycle are transmitted via the air gap. The balancing heads feature the zero-setting cycle to neutralise the position of the balancing masses, which is useful when starting the machine or after the grinding wheel change. The balancing heads with contactless transmission consist of two parts (stator and rotor), and therefore require an external support for the stator
  • Balancing heads with contactless transmission and built-in acoustic sensor (FTCG and STCG): these heads bring together the characteristics and functions of the contactless balancing heads with a wide band acoustic sensor, that operates close to the grinding wheel.  The sensor guarantees the constant monitoring and check of the air gap, dressing and collision of the grinding wheel
  • Balancing heads with connected transmitter (FTAT): the balancing heads with connected transmitter use the contactless transmission but they have the stator and rotor slotted together, and therefore require a single support for the system seating
  • Balancing heads with coplanar masses for high speed applications (high speed STCG): this range of balancing heads is used exclusively for spindle type balancers and for applications on grinding machines that use CBN grinding wheels and electrospindles, and generally for applications with high peripheral speeds. The high peripheral speed demands the absolute need to align the centre of gravity of the balancer and of the balancer and grinding wheel, in order to prevent torque imbalance problems due to the centres of gravity being on different planes. There are two versions of balancing heads with coplaner masses: the first is cylindrical for conventional assembly and the second designed for the new assembly method of CBN grinding wheels. All the versions available feature a built-in wide range acoustic sensor. Furthermore they are available with separate connector for contactless transmission and with built-in transmission system.
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