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What causes ripples in stainless steel pipes
- 2020-07-07-

The reason for the corrugation of the stainless steel pipe is mainly caused by the vibration of the grinder-steel-grinding wheel system, perhaps because of 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, among which 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 wavy waves on the surface of the stainless steel tube.

Because the frequency of the forcing vibration is equal to the frequency of the exciting force, it may be a multiple of it. Therefore, because of this reason, the corrugation produced is 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 is possible), and then quickly retract the tool after a longitudinal pass. At this time, the traces of the "polygon" can be investigated 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 during surface grinding is also 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), and the condition is similar to that of the grinding wheel. For the same reason, the thickness of the grinding wheel drive belt, the staggered canine teeth, and the pulsation of the liquid in the oil pipeline caused by the operation of the oil pump in the hydraulic drive organization of the grinder may also have similar forced vibrations. 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 processing surface of the steel pipe appear straight wavy waves. 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 force of the grinding wheel against the workpiece, the greater the amplitude of the self-excited vibration, and the deeper the ripple.