Analysis Of Vibration And Mechanical Characteristics Of Combined Scraper Circular Saw Blade

As one of the wood saw tools,the scraper round saw blade is usually used for cutting hard wood,but the single blade scraper saw has less cutting efficiency,and the combined scraper round saw blade as a combination structure of the saw blade can better improve the saw cutting efficiency.Similar to ordinary single saw,combined blade blade blade at work can also produce vibration and noise,affected by external force,circular saw blade matrix is prone to deformation,thus affect the processing accuracy and sawing efficiency,therefore,how to reduce the combined scraper blade saw vibration and noise,improve the sawing stability,to improve the sustainable and healthy development of our wood industry is of great significance.This thesis studies the vibration,mechanical characteristics and fatigue life of the circular saw blade based on finite element simulation.The main work content includes the following aspects:The vibration and mechanical theory of the circular saw blade provides the theoretical basis for the subsequent finite element simulation analysis.ANSYS finite element software was used to analyze the modular circular saw blade and three different structural modular scraper blades,and studied the modal vibration pattern and the natural frequency distribution pattern respectively,and found that the influence of the scraper groove on the natural frequency of the circular saw blade was more significant.In addition,the influence of the number of external scraper grooves,groove width and groove length on the natural frequency of circular saw blade was studied.Finally,the running wave vibration of four structural circular saw blade was analyzed,the reasons of resonance were studied,and the combined structure of circular scraper circular saw blade with the best vibration and noise reduction effect was determined.Based on the harmonic response analysis of four kinds of circular saw blades by mode superposition method,the study shows that the displacement response of four kinds of circular saw blades along the axial excitation force is much greater than the radial and tangential direction,and the displacement response is gradually increased from inside to outside in the radial direction along the radial direction.In order to explore the influence of scraper slot on displacement response,by comparing the analysis of the maximum displacement peak response difference of the nodes,found that the maximum displacement peak response difference of the two sides of the node,indicating that both in the circular saw blade base and edge blade groove is beneficial to suppress the propagation of vibration,so as to achieve the effect of vibration reduction and noise reduction.Using the static module of ANSYS finite element software to analyze the optimal combination scraper blade structure,study the deformation and stress distribution under the centrifugal force,saw force and two loads,the results show that under various loads,saw blades meet the requirements of strength design and it is not easy to produce plastic damage.In addition,the influence of scraper structure,number of external scraper grooves,groove width and groove length on the strength of circular saw blade is studied,and the scraper structure parameters with the least influence on the strength were obtained.Based on the combination of the two kinds of load,the analysis of the four kinds of structural circular saw blade fatigue life,the study shows that the structure circular saw blade minimum fatigue life cycle times,only appear in the stress concentration on most of the saw blade fatigue life cycle times,therefore,the four kinds of structural circular saw blade meet the requirements of fatigue life design.