Study On The Roll Tensioning Technology And Mechanism Of Circular Saw Blade

Circular saw blade is one of the most popular cutting tools in many industries.It is used to cut materials such as:wood,metal,stone,concrete,etc.Saw blade is one kind of thin slice cutting tools.Its main feature and structure is that the thickness is much smaller than diameter and it need to endure harsh working environment and cut in high speed.These characteristics will seriously affect its stability in cutting process,causing strong vibration and reducing its machining accuracy and service life.That the blade has a residual stress distributed unevenly is one of the main reasons for the unstable operation.In order to improve the stability during work as well as stress distribution of the saw blade,some roll tensioning methods as hammering,rolling,shot peening,heating and expanding method should be used to process.Of which,rolling method is recognized to be a good method with high efficiency,simple operation,high feasibility and unity.This paper mainly focuses on studying the principle and technology of the roll tensioning,adopting Finite element method to establish the roll model,using Finite element numerical simulation to analyse the effects of the process parameters such as rolling pressure,position and radius on the residual stress distribution and stiffness and studying the stress distribution and stiffness characteristics of saw blade under different process parameters through means of theoretical calculation,numerical simulation and field experiment.This paper provides a theoretical basis and efficient processing methods for the manufacture of circular saw blades,improving the stiffness and stability of circular saw blade and promote the production of saw blade industry in our country.After conducting in-depth research from theory and practice,the main creative achievements are reflected in the following aspects:1.The mechanism of saw blade stress test method is explained through theory and simulation.The finite element analysis is adopted to point out the influence of test parameter and internal stress state of the saw blade on the characteristic curve.2.Applying the formula to calculate perpendicular stress and radial stresses,thereby analyzing the effect of the stress distribution rule in diferent rolling pressure,rolling position and rolling radius.Different rolling position:roll position closer to the hole,inside rolling in the circumferential pressure stress is larger and the outer part of the circumferential tensile stress is small;diferent rolling pressure:with the same roll pressure,the smaller the radius of the roll pressure,the residual stress of the saw blade will be.Meaning that the smaller the radius of the roll pressure is adopted to larger residual stress distribution.3.Researching to set up a simulation model of roll tensioning process,analyzing the operating characteristic curve and residual stress distributed within the saw blade after rolling.The analysis result shows that:roll tensioning decreases the saw blade's horizontal stiffnes,meaning that the greater the roll pressure,the smaller the horizontal stiffness of the saw blade,the greater the roll pressure,the range of change horizontal stiffness of the saw blade is greater(31172?18660)N/m;with the same roll tensioning pressure,the larger the rolling radius,the stiffer the saw blade will be,when the roller radius is 62mm,it reaches 14955.8N/m.4.Experimental research on roll tensioning on saw blades has been carried out to study the stress changing regularity of the saw blade when rolling,consider the factors influencing the rolling pressure,number of rolling times,rolling position and roller,summarise the effect of the stress circle on the number of rolling times and roller parts.