Catalogue Force and Torque Sensors for Monitoring Manufacturing
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Piezoelectric Force Measurement in Practical Applications
Measuring the press-fit force as a function of displacement is a very precise method of monitoring the press-fitting of bearings, sleeves or shafts into applications such as housings or gearboxes. The distinctive force characteristic produced during this process is suitable for assessing both the quality of the process and that of the fi­nished products. CoMo control monitors are used to analyze this force characteris­tic in order to determine whether a part is "OK" or "NOT OK".
During the press-fit process, control moni­tors record the interdependent variables of press-fit force and displacement in pairs. This way, a functional relationship is estab­lished, which is then evaluated at the end of the cycle. The parameters for the sys­tem's monitoring and evaluation functions can be selected across a wide range of op­tions to suit the specific requirements of the press-fit process.
Press force sensor Type 9343 for direct force measurement
Strain sensor Type 9232 for indirect force measurement (alternative method)
Force sensor Type 9041A for direct force measurement (alternative method)
Force sensor Type 9133B for force shunt measurement
Process Evaluation
In order to visualize deviations in a refe­rence part, a reference curve from an op­timum joining process can be highlighted in blue and then be stored in the CoMo control monitor.
The press-fit process is analyzed by means of evaluation objects such as thresholds, evaluation objects and end boxes. These objects can be positioned graphically via cursor keys or by keying in the correspon­ding coordinates on the keypad. The posi­tion and evaluation mode (entry and exit, passage, minimum and maximum force, etc.) can be defined almost arbitrarily.
A conforming part is signaled only if the measurement curve has passed through specified evaluation objects according to definition. An evaluation object is clearly defined by entry and exit of the measure­ment curve. Failure to pass through an evaluation object correctly will designate the part as "NOT OK." Entry and exit sides are marked in green and an arrow indicates the direction of passage. Red limits must not be exceeded. A maximum of twelve evaluation objects can be com­bined as required.
Monitoring press-fit processes with CoMo control monitors offers the fol­lowing benefits:
+ Protection from joining of flawed parts,
+ error-free output increases produc­tion efficiency,
+ protection of machine, tool and workpiece,
+ process visualization and statistic process monitoring ensure optimum process control,
+ transparent and continuous pro­cess documentation allows optional benchmarking against other proces­ses and
+ optional integration into third-level, PC-based quality control systems.
Three CoMos monitor the press-fitting of needle bearings into a gearbox
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