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ZERO DEFECT PRESS-FIT ASSEMBLY ENABLED BY FORCE MONITORING
28 January 2007 - Kistler Instruments
| Press fitting of bearings, bushings or shafts, for example in housings or gearboxes, can be monitored very accurately through the variation in the pressing force over the displacement. The characteristic nature of this force curve allows evaluation of the quality of process and tool. ControlMonitors from Kistler analyze the curve and decide whether or not the assembly is acceptable. |
Press fitting of bearings, bushings or shafts, for example in housings or gearboxes, can be monitored very accurately through the variation in the pressing force over the displacement. The characteristic nature of this force curve allows evaluation of the quality of process and tool. ControlMonitors from Kistler analyze the curve and decide whether or not the assembly is acceptable.
CoMo brand control monitors record the interdependent measurement variables of pressing force and displacement in pairs during the press-fit process. They display their functional relationship as shown in the diagram below and evaluate it at the end of the cycle. Process evaluation
To reveal deviations from a reference part, a reference curve determined from an optimal press-fit process can be stored in the CoMo and shown in blue. The press-fit process is evaluated on the basis of thresholds, tolerance boxes and stop position windows. These objects can be almost freely defined in terms of position, size and type of evaluation (entry, exit and transit, minimum and maximum force, etc). To obtain a part that is acceptable the measured curve must pass through the chosen evaluation objects as defined. Entry and exit sides are highlighted in green and the direction in which the curve passes through them shown by an arrow. Red limits must not be breached. A maximum of 12 evaluation objects may be freely combined.
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About: Kistler Instruments
Kistler is one of the world's leading suppliers of measurement technology. Kistler pressure sensors, force sensors and accelerometers use the piezoelectric effect for precise measurement of mechanical properties. Kistler is a privately-owned Swiss company which develops and manufactures sensors and electronics for measuring pressure, force and acceleration. Additionally, the functionality of electronics plays an increasing role when defining a measuring system and even more frequently, electronics in fact becomes part of the sensor itself. Most of Kistler's products have been developed in close cooperation between leading universities or research facilities and Kistler's engineers. Investments in Kistler's research department have led to the development of new crystals which enable reliable measurements to be taken under the most extreme environmental conditions. The results of our in-depth crystal research will give us a leading edge in advancing the state-of-the-art. |
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• For January 2007
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• For Pressure sensors
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