The Pneumatic Grinding Wheel With Consolidated Progressive Mesh Abrasives And Its Flexible Polishing Test

The laser hardening technology is widely used in mold, and significantly improved the hardness and tear resistance of the mold. The single layered Softness Consolidation Pneumatic Grinding Wheel(SGA)is faced with the limitation of the highest-precision when machining, and the range of machining roughness is narrow, so we always machining the laser hardening surface by changing the SGA of different mesh abrasives manually so that they can machining step by step, This method does not meet the purpose of automated processing, and lowered processing efficiency.In order to solve the limitations of single layered SGA. This paper proposed the preparation of the pneumatic grinding wheel with consolidated progressive mesh abrasives, the mesh layer is composed of 80#、120#、180# 3 layers of different abrasives. Different mesh layer has its own machining range, after the outer layer shedding completely, the new abrasive of inner layer will be exposed gradually and finishing. When machining the workpiece by changing the SGA, the texture of the surface will change and influence the surface quality, This new kind of SGA not only avoid the disadvantage of changing SGA, but also improved the efficiency and the automation of finishing greatly. Specific contents are followed:1)Through the analyzation to the material composition of the SGA: using the short fiber reinforced-matrix to strengthen the rubber matrix; Analysis the mechanic of the mucosal layer by different components, Obtain the optimum thickness of the rubber layer 3mm, mucosal thickness 2 ~ 2.5mm. Analysis the efficiency of preparation and finishing to determine 3 layer.2) Through the flexibility analysis of dynamic contact process, the stress-strain relationship is obtained, establish the mechanical model of progressive mucosal SGA. By changing the rotating speed and press, its simulation analysis is used to describe the dynamic stress, and obtain the most dangerous surface, derive the optimum inflation pressure 0.1MPa and rotating speed 1250 rpm.3)For multiple layer of different thickness、different mesh abrasive mucosal layer, we propose and prepare a new SGA with progressive mesh abrasives. Through surface quality and grain loss experiment of 80#、120#、180# single layer SGA to determine the thickness of different mucosal layer 2mm、0.21mm、0.3mm. The short fiber reinforced rubber matrix and mucosal layer is further elaborated. Through KEYENCE VHX-600 E digital microscope observed the profile of produced progressive SGA, the thickness of different mucosal layer is consistent with the theoretical value, the error is less than 5%.4)Surrounding the material removal characteristic of progressive mesh abrasive SGA, through experiment obtain the optimum parameters 0.1MPa inflation pressure and 1250 rpm rotating speed, which verify the simulation results. When the SGA with progressive mesh abrasives machining,without having to changing to SGA, the grinding process is more steady, reduced the influence to cutting line and the surface quality due to changing the SGA; Meanwhile the efficiency of completing the initial finishing improved 34.6% compared to 180# abrasives SGA; the efficiency improved 19% compared to changing the SGA.In order to improve the finishing efficiency on laser hardening surface, the research ideas and results of the paper provide some theoretical guidance and technical reference value for more pneumatic grinding wheel with consolidated progressive mesh abrasives.