Research on strength reliability improvement of a high-speed cam based on stress-strength interference theory

Abstract To realize the control of high speed, heavy load, and intermittent motion law, the rotary bore automatic machine often adopts the “herringbone” cylindrical roller cam mechanism. Under the high-speed transient impact, the stress in the curved groove and commutator of the cam mechanism is on the high side, and it is easy to cause structural damage. In the past, deterministic models are often established without considering the influence of randomness such as load and materials on structures. Based on the stress-strength interference theory, considering the random characteristics of structural clearance material and load, the strength reliability of the cam mechanism is evaluated. The results show that the strength reliability of curved grooves and commutator structures is low. By optimizing the curvature of the curved groove and commutator transition part, the stress level of the curved groove and commutator is effective, and the reliability of the cam mechanism is improved. This has important reference significance for carrying out the strength reliability improvement of similar problems.