Precision straightening of shafts by uneven burnishing

This article presents results of experimental studies on the effects of uneven shaft burnishing and their precise straightening or frown.

1. INTRODUCTION
This article contains the results of research on the effectiveness of precision shaft straightening. Shaft deflection is the result of residual stresses that arise during the manufacturing process or excessive loads during operation. The geometric shape of shafts with a straight axis and crankshafts operating in high-speed machines or engines must meet high requirements. For example, the mutual runout of precision shaft journals must not exceed 0.004 ÷ 0.006 mm, and the mutual runout of crankshaft main journals must not exceed 0.02 ÷ 0.05 mm [1].
Uneven burnishing aims to introduce compressive residual stresses on the concave side of the deflected shaft, which will cause:
a) straightening of the shaft, b) increase in fatigue life.
The authors conducted experimental studies on the effectiveness of precision shaft straightening using uneven burnishing. (…)

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