| Diamond frame saws are widely used in the processing of wide surface slabs,and the stability of their main motion system has a great influence on the production efficiency and quality of slabs.In this paper,the main motion system of the frame saw is used as the research object,and the experimental study of the sawing performance of the frame saw,the kinematic error analysis of the main motion system,the dynamics study of the main motion system with gap,the optimization of the main motion system and the finite element simulation analysis are carried out to provide accurate theoretical guidance for the stable sawing of the saw.On the basis of the analysis of the frame saw cutting trajectory,saw tooth load characteristics,sawing test research,through the test observation of the saw teeth and plate surface microscopic morphology after sawing,the analysis of the plate flatness.The sawing force generated by the sawing process sawing force at the point of commutation of the sawing motion at the peak of the abrupt change,and the saw blade by the maximum sawing load there is a large commutation impact;sawing process,tooth wear so that the side diamond particles out of the edge and sharpening;in addition,the stone plate processing surface there are obvious thickness inconsistencies,the main motion system of the frame saw saw sawing stability has a significant impact on the flatness of the plate.The results of the study provide a theoretical basis for a more accurate analysis of the main motion system of the frame saw and optimization of the saw structure to improve the sawing performance.The kinematics and dynamics model of the main motion system containing component dimensional errors was established,and the influence of its dimensional errors on the kinematics and dynamics was explored,and the influence of the deviation of its kinematic parameters on the forces on the components was quantitatively analyzed.Within the maximum allowable error range of crank and connecting rod,the acceleration deviation of the saw frame is greatly affected by the dimensional error of the crank connecting rod;and the established kinetic model is verified to be in line with the production reality,and the accuracy of the model is improved by 15.49%;the acceleration deviation of the saw frame is substituted into the model,and the results show that the force variation of the saw frame generated by the acceleration deviation of the saw frame of 692.55 mm/s2 reaches 13,900 N,and the force of other components The range of force variation of other components is 1200 N-13900 N.The force of the main motion system components is significantly affected by the acceleration deviation.The assembly size chain of the main motion system was calculated,the influence of the assembly error on the dynamics of the main motion system was analyzed,and a hybrid model of the contact collision force of the main motion system with gap was established and dynamics simulation was carried out.The increase of the gap makes the peak of the saw frame acceleration appear larger,the fluctuation intensifies,and the collision force increases;and the recovery coefficient increases,the collision force increases,and the time to reach the peak becomes longer;conversely,the energy loss of the collision process becomes larger;the model simulation results are compared,and the applicability of the model established in this paper is verified.Using the dimensionless root-mean-square and amplitude impact indicators,the effect of clearance on the dynamics of the main motion system is explored,and the improved main motion system is subjected to finite element simulation analysis such as statics and modal.The increase of the gap makes the frame saw main motion system jitter amplitude increase,intensifies the wear,the greater the influence on the main motion system motion accuracy and motion stability,making the accuracy worse;the optimized frame saw main motion system meets its static and dynamic characteristics and sawing processing requirements. |
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