Question

Bent shafts and axles are often straightened by cold-bending in a press. Discuss the implications on future fatigue life.

Answer 1

Yes, Bent shafts and axles are often straightened by cold - bending in a press. It also known as Cold straightening method. cold straightening technique is more than 40 yrs old and has developed and improved over time. The latest technology allows straightening of shafts of all sizes - from 20mm to morethan 1000mm.In diameter and morethan 25 meters in length. So large bent shaft also possible to straighten by cold bending process cold straightening equipment consists basically of hydraulic presses equipment with numerical control and sensors for dimensional inspection & parts. Implications on future fatigue life: 1.The bentshafts straighten by this technique was capable to work as new shaft. It does not undergo fatigue in short time. 2. The future fatigue life is very good.it works better and capable to bear stresses as like as new. 3. Cold straightening does not affect the inetallurgy of the shaft, as it actually release stress from the material. 4.High accuracy and quick delivery time possible. 5.The fatigue loads, will not affect the shaft directly. Shaft under fatigue loads may fail after a long time. So it service time also high(life time).