Crankshafts have to withstand complex mechanical stresses. For this reason, their hardness is tested parallel to production.
Hegewald & Peschke has a corresponding measuring station for crankshaft testing in its extensive hardness testing program.
With this crankshaft test stand, all cylindrical surfaces (pins) arranged parallel to the axis of rotation can be measured. The measurement is made perpendicular to the axis of rotation in any radial angular position of the workpiece.
The system can be used to test crankshafts up to a length of 1500 mm and a diameter of 20 to 205 mm. The crankshafts are positioned in a receptacle and rotatably clamped. To reach a measuring position, the workpiece can be rotated freely around its axis and the probe can be aligned to the workpiece in X, Y and Z directions. This allows testing over the complete alignment circle (diameter) of the crankshaft. The Rockwell probe is mounted on a mechanical displacement unit. This design principle allows the entire length of the crankshaft to be run off without having to remove the crankshaft from the holder. The actual test procedure runs automatically. Once a test position has been reached, the operator triggers the force-supported tensioning and centring of the journal to be tested. The hardness measurement (loading and unloading with test force) is then carried out automatically via the built-in pneumatic system.
Depending on the test scope, up to 30 crankshafts can be tested per hour. The measured value is shown on the display and can be output via an RS232 interface after each measurement. The test data is automatically transferred to the user's Quality System.