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The end cover represents one of the most frequently encountered mechanical components across numerous industrial applications and constitutes a critical external structural element of the bearing seat assembly. Within rotating machinery systems, the end cap performs several essential functions that directly impact operational reliability and component longevity.

According to the technical requirements of the end cover parts, the left end face of the end cover and φ25 holes are selected as the precision benchmark, and many surfaces on the parts can be used as the benchmark for processing, that is, to follow the principle of "benchmark unity". The axis of the 25 holes is the design basis, which is selected as the basis of the two end faces of the positioning end cover, to achieve the coincidence of the design basis and the process basis, to ensure the machining surface of the end runout requirements. The choice of the left end face of the end cover as the fine reference also follows the principle of "reference coincidence", because the size of the end cover in the axial direction is mostly based on the end face.

The end cover represents a structural component characterized by its straightforward design architecture and conventional geometric configuration, functioning as a standard disk cover assembly within mechanical systems. This component requires comprehensive machining operations across multiple surfaces to achieve the precise dimensional tolerances and functional performance specifications demanded by its application context. The primary machining surfaces encompass the left and right axial end faces of the end cover, along with the square-configured end faces, where the end runout relative to the rotational axis must conform to a stringent tolerance of 0.03mm, a requirement that necessitates careful process planning and tool path optimization to maintain concentricity throughout production.