Importance

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Abstract

A machine suitable for evaluating finished cylindrical manufactured part that accurately simulates the performance of the intended use of the part in a cam-roller contact geometry using an actual manufactured part as the test specimen is provided. The machine is capable of evaluating the effects on the can finish and profile of the manufactured part. Three idler rollers ground to simulate the axial cam geometry are compressed into the outer diameter of the bearing as it rotates, duplicating the rolling action of a cam lobe. Because the cylindrical manufactured part to be tested is loaded evenly between the three idles, the test part experiences three stress cycles per revolution, accelerating the generation of fatigue spalling damage on the outside diameter. Load and speed are regulated using a closed loop control. Ease of replacing the part to be tested and servicing the idler rollers is an advantageous feature of the machine. A calibration fixture is provided for verifying that the machine is applying the specified load evenly on all three sides of the cylindrical manufactured part that is under test. Alternately the machine can be configured so as to enable the testing of three manufactured test specimens simultaneously. With the addition of a torque transducer, the torque generated between a journal bearing roller and shaft may be measured and monitored.

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First Claim