Simple actuators provide precise positioning
A
Kistler Instruments product story
Edited by the Engineeringtalk editorial team
May 28, 2008
Kistler Instruments' actuators are exceptionally simple to install and offer flexibility, precise positioning, very high repeatability and accurate monitoring and control of the joining force.
Kistler Instruments has released two new electro-mechanical NC press-fit systems that offer significant advantages over hydraulic systems.
With only two multipin plug connections, the new actuators are exceptionally simple to install and offer flexibility, precise positioning, very high repeatability and accurate monitoring and control of the joining force plus minimum maintenance requirements.
Kistler's piezoelectric sensor expertise allows the range of press force up to 60kN to be covered by just two modules.
The new products are based on a range of seven well-proven press-fit actuators manufactured by Dr Staiger Mohilo, which were sold mainly to the German auto manufacturing industry.
When Kistler acquired Staiger Mohilo in mid- 2006, the actuators were further developed by integrating Kistler piezoelectric force sensors, allowing the range to be reduced from seven modules to only two to cover the range from 1 to 60kN.
This was made possible by the switchable measurement range, overload tolerance and consistent accuracy of the piezoelectric force sensors.
The actuators are based on a hollow shaft servomotor assembled directly around the threaded drive spindle to eliminate the need for gearing and provide highly responsive operation and compact dimensions.
Although the length of the two modules is only 475 and 795mm, the stroke is 200 and 400mm respectively, making the units suitable for under-bench mounting and capable of extended end-point operations, such as bearing installation in transmission half shells.
The high stroke speed of 300mm/s minimises machine cycle time to maximise productivity.
The force being applied by the actuator is constantly measured by the integrated piezoelectric sensors and combined with a displacement signal by the monitoring system to ensure any deviation from predetermined parameters causes a reject signal to be generated.
Both modules are fitted with a standard holding brake to prevent the ram from dropping when the power is switched off, even when heavy tools are used.
The compact size, simple installation, long stroke and high speed provide the machine designer with a high level of flexibility.
The elimination of the need to pump and pipe hydraulic fluid reduces the cost of installation and delivers significant environmental benefits.
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