Experimental Study On Removal Process Of White Marble Cutting

As a typical hard and brittle material,marble is widely used in interior and exterior decoration design,curtain wall decoration,precision instrument base and public facilities construction.However,traditional processing methods have many problems such as inefficiency,poor processing mode and terrible environment,lack of professional knowledge,high labor intensity and great harm to the human.With the presentation of China Manufacturing 2025 and the National Revitalization Stone Strategy,the stone industry has begun to use many advanced intelligent manufacturing equipment such as CNC equipment,while the traditional stone processing is mainly grinding,but the abrasive tools are easy to wear when grinding in CNC equipment,affecting the shape accuracy.At present,there are many cuttings used in CNC equipment,while cutting used in stone processing lacks the necessary theory.Therefore,this paper designed three experiments(marble scratching,single-point turning and milling experiments)for the stone machining cutting mechanism.By changing the cutting parameters(spindle speed,feed rate,depth of cut and cutting width),the experiment was carried out to analysis the influence of these parameters to the results(roughness,cutting force,etc.).And the ultimate goals are to explain the relationship between the cutting tools and marble,the broken form of stone,and the influence of different parameters on the surface morphology of the machined surface.(1)Scratch test was carried out,and the friction coefficient was obtained by dividing the tangential force by the axial force.It was found that the linear velocity had no significant effect on the friction coefficient and the scratching force,and the increase in the cutting depth made the friction coefficient and the scratching forces increase.In the scratch test,the marble fracture form was mainly composed of intergranular fracture,accompanied by a little transgranular fracture;(2)Performing a single-point turning experiment,it was found that the linear velocity had less influence on the cutting force,the increase in the cutting depth made the cutting force increase.The crack on the surface of the turning area could always avoid the place with large shear strength during the expansion process,and choose to extend to a small place.When the marble was impacted,the layer-by-layer spalling was mainly carried out along the intercrystalline crack,and when the marble was impacted,its layer-by-layer spalling was mainly carried out along the intercrystalline cracks.When a large obstacle was encountered,the crack would follow the direction perpendicular to the pass and continue to expand.(3)Orthogonal milling test was carried out,and the influence of cutting parameters on cutting force and roughness was analyzed.The results showed that the influence of cutting parameters on cutting force was: cutting depth > spindle speed > cutting width > feed rate The influence of cutting parameters on surface roughness was: feed rate > cut width > spindle speed > depth of cut.A significant test was performed by fitting the cutting force and roughness equations to the data.(4)Single factor milling experiment was carried out.It was found that the increase of the spindle speed increased the cutting force and the chip size became smaller.When the feed rate increased,the cutting force increased and the chip size became larger.