Study On Grinding Process Of Boron-Cerium Dioxide Co-osmosis Reinforced Iron-based Materials

Boronizing is a surface heat treatment method that can improve the surface properties of metal alloys.In the boron infiltration process,solid boronizing is widely used in boron metal because of its simple method,easy operation and low cost.Although the performance of ironbased powder metallurgy materials is greatly improved after boronizing,defects such as cracks and holes are prone to appear on the surface of the boronized layer after boronizing heat treatment.However,iron-based powder boronized materials are widely used in mechanical parts,but with the rapid development and progress of China’s manufacturing industry,the performance and surface quality requirements of parts are getting higher and higher.Grinding technology is a precision machining process designed to remove the surface damage layer left by the previous process in order to obtain the desired surface quality and flatness.However,the grinding and processing mechanism is more complex,and the optimization of the material removal mechanism and process parameters needs further study.In the grinding technology,it has been widely favored due to the advantages of consolidating abrasive technology,low energy consumption,good process effect and high processing efficiency.In this paper,the grinding experiment of boron-cerium dioxide co-osmosis reinforced ironbased powder metallurgy materials was carried out,and the effects of grinding process parameters such as grinding particle size,pressure,speed and time on the surface hardness,roughness,residual stress,material removal rate and bending properties of boron-cerium dioxide coosmosis strengthened iron-based powder metallurgy materials after grinding were studied.The results of the study showed that:(1)The boronized layer was ground by using diamond-free grinding pads,diamond grinding pads,deionized water slurry and diamond grinding pads,and the influence of different grinding schemes on the material removal rate was analyzed.The results show that the deionized water slurry and diamond grinding pad have the largest removal rate and relatively good surface quality in the process of material removal.(2)Through orthogonal experiments,the grinding process parameters were optimized,and the optimal grinding process parameters were obtained: grinding particle size W 40,pressure 0.15 MPa,speed 60 rpm,time 20 s.(3)In the grinding process,it is found that with the increase of grinding particle size and grinding pressure,the material removal rate,surface residual stress and surface hardening overall increase trend,and the surface roughness increases with the increase of grinding particle size,and decreases first and then increases with the increase of grinding pressure.With the increase of grinding speed and grinding time,the surface residual stress and surface hardening degree as a whole show a trend of first increasing and then decreasing,with the increase of grinding speed,the surface roughness first increases and then decreases,the material removal rate increases the phenomenon,with the increase of grinding time,the surface roughness increases the phenomenon,and the material removal rate increases first and then decreases.(4)The three-point bending experiment was used to explore the bending performance of the ground workpiece and the original sample,and its flexural strength was the largest when the grinding parameter was(W 40/0.25 MPa/60 rpm/20 s),and its maximum load was 562.0 N;Under the condition that the grinding parameter is(W 40/0.15 MPa/40 rpm/20 s),the plastic deformation generated is large;The bending performance of the ground workpiece throughout the process is higher than that of the original sample.