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Why The Surface Of Stainless Steel Pipe Is Prone To Corrugation

Ripple originally refers to water ripples formed by slight undulations on the water surface, and can also be used on other surfaces with similar shapes to water ripples. Water ripples formed by subtle waves.

But why is the surface processing of stainless steel pipes prone to ripples?


The reason for the above-mentioned ripples is mainly due to the vibration of the grinder-steel-grinding wheel system, or the vibration of the grinding wheel relative to the workpiece. This vibration includes forced vibration and self-excited vibration. There are many specific reasons for the vibration, the main ones are: the grinding wheel is unbalanced, and it has not been carefully balanced before installation. Therefore, forced vibration is generated during the grinding process, causing straight wave ripples on the surface of the stainless steel pipe. Because the frequency of the forced vibration is equal to the frequency of the exciting force or its multiple. Therefore, due to this reason, the ripples are deeper and the wave distance is wider, and the frequency of the wave is related to the speed of the grinding wheel. When stainless steel pipe is processed, the identification method can apply a thin layer of red oil on the surface of the workpiece, and adjust the moving speed of the worktable so that the moving distance of the worktable is slightly equal to 2/3 of the width of the grinding wheel when the workpiece rotates once. , And then move the grinding wheel holder so that the grinding wheel has just touched the red oil (no cutting), and then quickly withdraw the tool after a longitudinal pass. At this time, traces of "polygons" can be observed on the surface of the workpiece, and the wave distance (that is, the side width of the polygon) can be measured, and the frequency of the wave (wave frequency) can be calculated. The identification method for surface grinding is similar to this.

The unbalance of the grinding wheel drive motor will also produce forced vibration and cause straight wave ripples (when grinding the outer circle) or horizontal ripples (when grinding the plane). The situation is similar to that of the grinding wheel. For the same reason, the thickness and length of the grinding wheel drive belt are different, and the pulsation of the liquid in the oil pipeline caused by the operation of the oil pump in the hydraulic drive mechanism of the grinder may also cause similar forced vibration. However, the vibration caused by this is slightly milder. When the stainless steel pipe surface is processed, the elastic deformation of the steel pipe and the machine tool system during the grinding process will increase the strength of the self-excited vibration during the grinding process, and make the steel pipe processing surface appear straight wave ripples. At this time, the ripples are shallower and denser, and the wave frequency is generally around 300 per second, which is inconsistent with the speed of the grinding wheel. The worse the rigidity of the steel pipe and the machine tool system, the greater the friction of the grinding wheel against the work piece, the greater the amplitude of the self-excited vibration, and the deeper the ripple.

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