Constant Force Cutting Control Method And Experimental Research On Diamond Wire Saw Cutting

Hard and brittle materials such as silicon carbide,single crystal silicon,sapphire,and optical glass are widely used in modern equipment and electronic fields beacuse of their high hardness,high wear resistance,good chemical stability and electrical properties.However,the high hardness and high brittleness of the mateirals make great difficulties to processing,making cutting and separation are so difficult to be realized.Nowadays,the reciprocating consolidation diamond abrasive wire saw cutting method is popular because of its narrow incision and high material removal rate.During the wire saw cutting,it will directly affect the processing efficiency and the surface quality of the slice by the changing of the workpiece feed speed and wire saw velocity.Therefore,this paper focuses on the reserch of the hard and brittle material cutting force control method,which was processing by the reciprocating diamond wire saw.And it mainly analyzing the effection on cutting force by the feed speed and wire saw velocity,which has important theoretical significance and engin eering application value.and uses different control methods to reduce the fluctuation of the cutting force during the cutting process,thereby improving the surface quality of the single crystal silicon slice and improving the processing efficiency.Based on the analysis of the principle of the diamond wire saw cutting process,It established a cutting force analysis model in this paper,and determined the calculation coefficient of the cutting force during the cutting of monocrystalline silicon through experiments,which provided a reference for the control of the cutting system.With a fixation of others variables in the models,a constant force control method was designed with the control variables such as wire saw velocity,feed speed and the ratio of wire saw velocity to feed speed,meanwhile the corresponding control algorithm was designed based on the Lab VIEW system.The single crystal silicon reciprocating wire saw cutting control experimental platform was established,and the closed-loop controller was developed for real-time feedback of wire saw speed through encoder and workpiece feed speed through magnetic gate ruler,which can measure the wire saw velocity,feed speed and cutting force in a more accurate way.Based on this platform,a constant force cutting experiment was carried out with the control parameters which is wire saw velocity,feed speed and speed ratio.The results show that the open and closed loop control of wire saw speed and feed speed has great influence on the stability of cutting force.The constant force cutting control with speed closed loop control has better cutting quality and higher processing efficiency.The speed ratio has a great influence on the stability of the cutting force.The surface quality of the slices will be better when the speed ratio is 1.5,and the cutting force is also stable,which verifies the effectiveness of the proposed method and provides a good guidance for actual processing.