FEATURE TEST & MEASUREMENT
The torque, angle and clamping force need to be measured to check the bolt friction
In-process testing of bolted joints I
A new instrument from Schatz, a Kistler Group company, offers a convenient way to test torque and rotation angle on bolted joints, providing graphic analyses of assembly processes to ensure that bolted joint assemblies meet optimum quality standards
NSPECTpro, the new portable measurement and evaluation
instrument from Schatz, a Kistler Group company, offers a convenient way to test torque and rotation angle on bolted joints. This system provides graphic analyses of assembly processes to ensure that bolted joint assemblies meet optimum quality standards. The software and hardware of the
INSPECTpro torque and angle instrument provide easy random-sample testing, process capability testing and graphical process analysis in assembly operations to ensure optimal quality of bolted joint assembly. The versatile instrument is equally suited a wide variety of quality assurance applications including random- sample testing, testing drivers and torque wrenches, testing joint components, and determining the process capability of already assembled bolted joints in combination with handheld torque/angle sensors up to 5,000Nm.
ANALYSING TORQUE AND CLAMPING FORCE The key parameter in the assembly process for bolted joints is the clamping force, which is the force generated by the bolts to hold the assembled parts together. The clamping force must be high
28 DECEMBER/JANUARY 2018 | INSTRUMENTATION / INSTRUMENTATION
enough to ensure that the joint will not come loose due to relative motion of the bolted joint. However, the clamping force is not
measured directly in production but is deduced from the torque. The bolt friction, such as the friction present with the correct lubrication, has a major effect on the relationship between torque and clamping force. In case of doubt, the INSPECTpro allows the friction figures to be measured quickly and easily on the assembly line to verify that they are correct.
The torque/angle sensor is fitted between the male square drive and the socket
RANDOM-SAMPLE TESTING IN BOLTED JOINT ASSEMBLY PROCESSES The torque/angle sensor is fitted between the male square drive and the socket. Random-sample testing is performed in bolted joint assembly processes to monitor the interaction between the assembly tool (driver) and the bolt. For these tests a torque/angle sensor is fitted between the male square drive and the socket. This enables measurement of the achieved torque and/or angle as well as graphic analysis of the torque versus angle curve of the entire bolting process.
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