Research On Wire Bow Parameters In Multi-workpiece Diamond Wire Sawing

Diamond wire sawing has become the mainstream sawing technology for brittle materials due to its advantages of strong cutting ability,high surface quality and small crack damage.To further improve production efficiency,single-workpiece sawing has been expanded to multi-workpiece sawing and single-wire sawing has been expanded to multiwire sawing.The change of workpiece quantity and sawing position will significantly affect the state of the wire saw,then affect the sawing ability,sawing stability and breaking risk of the wire saw,and finally change the cutting efficiency,surface quality,machining quality and other technical parameters of the diamond wire sawing.Therefore,a mathematical model of multi-workpiece single diamond wire sawing is established in this paper.The theoretical relationship among geometrical parameters,sawing parameters and wire bow parameters is described in the model.Among them,geometrical parameters include workpiece quantity,sawing position,wire length,sawing length and wire diameter.Sawing parameters include sawing speed,feed speed and wire pretension tension.Wire bow parameters include normal sawing force,tangential sawing force,wire bow deflection and endpoint tension.The main research contents of this paper are summarized as follows:(1)Combined with the microscopic mechanical model of abrasive particles,the macroscopic force of the wire saw is analyzed.The deflection of wire saw formed in sawing is deduced and the deformation of each sawing segment is numerically fitted.Combined with the finite element simulation,the influence of workpiece quantity and sawing position on the bending of wire bow,the symmetry of wire bow and the tension change of wire saw is explored.(2)The mathematical model of multi-workpiece single wire sawing is established,and the theoretical relationship among geometric parameters,sawing parameters and wire bow parameters is described in the model.Experiments are designed to verify the model and the influence of workpiece quantity,sawing position and sawing parameters on wire bow parameters,sawing efficiency and surface quality are explored.(3)Time variable is introduced to explore the changing law of sawing forces,wire bow deflection,tension on both sides of the wire saw and other wire bow parameters with time.The sawing ability,sawing stability and breaking risk of wire saw are analyzed theoretically combined with wire bow parameters.The variation law of quality difference of the same slice along wire sawing direction is explored.(4)The single-wire sawing is extended to multi-wire sawing.The variation law of the total sawing forces with time and the difference in sawing ability of the wire mesh along the axis of the reel are analyzed.The influence of workpiece quantity and sawing position on machining efficiency and machining quality is explored.