In the process of reforming state-owned enterprises that did not really follow the modern enterprise system, because the original planned economic system and other ideas rely on and still affect people's ideas, the internal system of the enterprise has not been reformed and reorganized according to the modern enterprise system. Inspection and calculation examples of the interchangeability test and calculation of four NXZ tapered roller bearings.

In actual production, the interchangeability of tapered roller bearings must take into account the influence of various factors. Practice has shown that due to the combined effects of various factors, the outer ring raceway diameter De, the inner ring raceway diameter di, the inner ring large rib width a0 and the roller diameter Dw, etc., determine the dimensional tolerance of the bearing nominal width T tolerance. The parts are 100% inspected before loading, and there is no guarantee that the bearings will be 100% interchangeable after assembly.

Before the bearing assembly inspection, the two interchangeability inspection procedures of “interchangeability inspection tolerance of inner ring assembly” and “interchangeability inspection tolerance of outer ring raceway” must be adopted to ensure the tolerance of the separated outer ring and inner component is qualified. In order to ensure that the standard requirements of tapered roller bearings are completely interchangeable. There is no standardized operation mechanism for technical transformation work, and a few enterprises still use the planned economy model to carry out projects, resulting in loss of project market, over budget, slow progress or stagnation.

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