Study Of Biomimetic Laser Regeneration Technology On Failure Surface With Uneven Wear

Wear is the main reason for failure mechanical parts.Most failed mechanical parts have taken place uneven wear in the harsh production environment.Among them,the uneven wear phenomenon on the guide rail surface of machine tools is especially common.The thickness of the remaining quenched layer in the different areas of cast iron machine tool guide's surface is inconsistent.Due to the hardness of the quenched layer is decreasing along with the guide rail depth direction,the different microstructure,hardness and wear performance are distributed in different areas of the failure surface.At present,most traditional repair methods used a unified method to repair the uneven failure surface.This single surface-strengthening technique is usually performed on the basis of areas that are subject to more severe wear.This is undoubtedly an over-repair in the area where slight wear occurs,which increases the energy consumption.Moreover,the failure surface,with uneven properties distribution,couldn't be processed directly.It must be processed after removing the residual quenched layer,which the layer with uneven properties,and processing should be performed on the basis of obtaining a uniform surface.For the bed-body machine tool,to remove the quenched layer of the guide rail is easy to cause a serious lack of guide rail size,shorten the effective use of the machine tool,or even completely scrapped.As a result,the dual waste of manpower and material resources violated the concept of green recycling..This paper was based on the concept of green recycling.Inspired from the characteristics of uneven distribution of morphology and performance of most biological surfaces,biomimetic laser technology was used to regenerate the uneven failure surface,and an oil lubricated wear test was carried out to study the wear resistance of regenerated surface.Based on the experimental data,the laser biomimetic regeneration technology for uneven failure surface was studied.Providing a theoretical basis for achieving efficient,economical,and environmentally friendly method for repairing uneven failure surfaceThe uneven wear characteristics of the failure guide rail were studied.It was found that the failure surface in different areas of the same plane often suffered slight uneven wear,the difference in the thickness of the residual quenched layer was not obvious,and the difference in hardness was small,which was?HV?60 HV;Severe uneven wear often occured on the failure surface in different areas of different planes,and the thickness of the residual quenched layer was various greatly.The hardness difference in each area was also larger,and it was 100HV²00 HV.According to the above characteristics,the failure surface was divided into minor and severe unevewn worn surfaces,and equations were established for the two types of uneven worn surface with different degree of wear,respectively:?a?slight uneven worn surface:S_n=??HV_n?/?HV???S;?b?severe uneven worn surface:Y₂-a₁Y₁-P₁=1/k₁,Y₃-a₂Y₂-P₂=1/k₂and Y₃-a₃Y₁-P₃=1/k₃.By optimizing the laser parameters,the remelting unit?RU?and the bimaterial unit?BU?with excellent mechanical properties were prepared with the best laser parameters,and the surface was coupled to form a hard and soft structure.The wear resistance of the regenerated surface was studied.The effect of units'material?hardness?on the wear resistance of regenerated surfaces was studied.The results showed that the hardness difference between unts and substrates was not linearly related to the wear resistance of the regenerated surfaces.On this basis,the relationship between the hardness difference?HDV?of the unit and the substrate and the improvement rate of the wear resistance of the regenerated surfaces was established.The effect of the shapes of the units on the improvement of the wear resistance of the regenerated surfaces was studied,it was found that the relationship of wear resistance of regenerated surfaces coupled with different shaped units was as followed:reticulate regenerated surface>Punctuate-reticulate regenerated surface>Striate regenerated surface>Punctuate-striate regenerated surface>Punctate regenerated surface.The effect of the spacing in the range of 2 mm⁶ mm of the untis on the improvement of the wear resistance of the regenerated surfaces was studied,it was found that the wear resistance of the regenerated surface decreased as the units'spacing increased.On this basis,the relationship between the spacing of the units and the improvement rate of the wear resistance of the regenerated surface was established.Combining with the performance regenerative relationship between the uneven failure surface and the unit's variables and the increased rate of the wear resistance of the regenerated surface in each area,models were established to restore the consistency of wear performance of failure surface.?a?When repairing uneven failure surface with large difference in wear properties,model I–remelting unit shape,model I–biomaterial unit hardness and model I–bimaterial unit shape on the regenerated surface were established;?b?When repairing uneven failure surface with small difference in wear properties,model I–remelting unit spacing and model I–biomaterial unit spacing on the regenerated surface were established.A laser biomimetic regeneration technology was proposed.The main technical method was as followed:the rail surface was partitioned according to the hardness,and combined with the functional relationship of each area established in this paper,the corresponding surface model combination scheme was obtained,and a regenerated surface with uniform wear resistance was obtained.In addition,the reproducible surface error verification test was used to verify the feasibility of this method.