How to straighten a hydraulic cylinder piston rod?
Hardness measurement of hydraulic cylinder piston rod is usually divided into two kinds: destructive measurement and non-destructive measurement.Nondestructive measurements are less damaging and cannot be completely damaged.This injury is fatal in comparison to a piston rod, and therefore can only be done by destructive measurements.
Piston rods sometimes deform after nitriding. At this time, has reached the finished size requirements, and the surface hardness is very high.It cannot be refined by processing methods.Only the straightening method can be used to control the deformation at a reasonable level.In the range.Commonly used pressure straightener, whether hot or cold, its straightening accuracy is artificially affected, can reach 1 to 2 mm.
Usually, the bending deformation of some products after the nitriding of the piston rod is 0.1 to 0.3mm, so the deformation is very small and can not meet the requirements of the pressure correction machine.Bending and percussion vibration methods can be used for straightening.Straightening principle: the workpiece resonates under the action of the periodic external force exerted by the vibration exciter.The alternating stress and residual stress of each part of the workpiece are superimposed together to make the workpiece yield locally and cause small plastic deformation.The residual stress in the workpiece decreases, and the redistribution tends to be uniform. The anti-deformation property of the metal strengthens the matrix, so as to achieve the purpose of enhancing the stability of the geometrical precision of the workpiece.This process is called vibration stabilization.The vibration stabilization process is usually used to stabilize the parts and is used here as the straightening of the piston rod parts.