钎焊金刚石线锯切割石材时的锯切性能OA

Objectives:Diamond wire saw cutting stone has the advantages of narrow cutting seams,low production of stone powder,and a high yield rate.It can reduce the amount of stone powder generated in stone processing from the source and is a new processing technology that promotes the green and sustainable development of the stone industry.In view of the current problems in the stone industry,where electroplated diamond wire saws are prone to wear and consume a large amount of wire when cutting large-sized and heterogeneous stones with multiple wires,the idea of using a brazing method instead of the traditional electroplating method to solidify diamond abrasive particles is proposed to prepare wire saw tools and process large stone slabs.Methods:Under the same processing conditions,the process of cutting stone by self-developed brazed diamond wire saws and commercially available electroplated diamond wire saws is monitored.As a flexible cutting tool,the wire saw undergoes significant macroscopic deformation during the cutting process,resulting in a wire bow angle,which is an important parameter for measuring the sawing ability of the wire saw.Sawing force is the parameter most closely related to the sharpness and wear resistance of the wire saw,while the force ratio could reflect the difficulty of the wire saw cutting into the workpiece.The sawing force generated by the wire saw during the stone cutting process is examined from normal and tangential directions.The tangential force is along the direction of the saw's movement,while the normal force is along the cutting direction of the workpiece.At the end of cutting,the rapid lifting method is used to obtain the precise normal force.The tangential force,due to its obvious periodicity,is obtained through data analysis.The service life of a wire saw is a key factor in ensuring the continuity of the cutting process and the flatness of the stone surface after cutting.It is also a basic requirement for preventing the saw seam from expanding and saving costs.The wire bow angle,cutting force and wire saw life of the two types of wire saws during the sandstone sawing process are measured,and the cutting area and the cutting time under extreme conditions are obtained by cutting harder granite.The sawing processing efficiency and the wear morphology of the two types of wire saws are obtained to comprehensively compare the sawing performance of brazed diamond wire saws and electroplated diamond wire saws.Results:When cutting sandstone,the wire bow angles of both types of wire saws show an upward trend,but the wire bow angles of brazed diamond wire saws are smaller than those of electroplated diamond wire saws.When the cutting depth of the sandstone is 4 mm,the wire bow angle of the brazed diamond wire saw is only 20%of that of the electroplated diamond wire saw.At this point,the tangential and normal forces of the brazed diamond wire saw are only 38%and 32%of those of the electroplated diamond wire saw,respectively.The cutting force ratio of the brazed diamond wire saw is smaller than that of the electroplated diamond wire saw.When cutting harder granite,the electroplated diamond wire saw experiences wire breakage after cutting for 22 min of cutting on the machine,and the effective cutting area of the workpiece is about 440 mm2.The brazed wire saw experiences wire breakage at the 28 min of cutting,and the effective cutting area of the workpiece is approximately 670 mm2.In terms of cutting time,the cutting life of the brazed diamond wire saw is slightly longer than that of the electroplated diamond wire saw,about 6 min longer.Therefore,the cutting efficiency and tool life of brazed diamond wire saws are significantly higher than those of electroplated diamond wire saws.At the same time,the wear morphology before and after wire saw cutting shows that the wear behavior of abrasive particles during the processing of brazed and electroplated diamond wire saws is significantly different.Conclusions:Through experimental comparison,it is found that under the working conditions of stone cutting,the comprehensive sawing ability of brazed diamond wire saws is stronger than that of electroplated diamond wire saws,as reflected in the improvement of cutting efficiency,tool life,and wear resistance.