Rerearch On Design Method Of Furrow Plow Frame Based On Comparison Of Intensity

The furrow plow frame is the basic part of the furrow type plow,as well as an important bearing part.The optimal design of the various types of plows with the same existing application conditions,different researchers have different results,it is difficult to determine the most reasonable optimization results.After long-term actual production inspection of various types of plow frame,reliability is sufficient,but the quality is too large,and the lightest quality as the goal of the optimization function,it is difficult to ensure that the use of furrow plow frame optimization reliability.Therefore,this paper attempts to use the maximum stress at the dangerous cross-section as the constraint,optimize the same type of plow frame,on the basis of meeting the reliability,and to minimize the plow frame weight,save material,at the same time for all kinds of conditions for the same plow to provide standardized design ideas.The main contents and conclusions are as follows:(1)To analyze the force on the plow frame,simplify the force analysis with the relevant theories of structural mechanics and theoretical mechanics,determine the loading of the load,deduce and expound the finite element mechanics model of the plow frame,thus to lay the foundation for the follow-up finite element simulation of the plow frame.(2)In this paper,three models of furrow type plow frames with reliable strength and stiffness to meet the design rules and operation proved after the long-term application are taken as the objects of study,CAD/CAE technologies are used to carry out three-dimensional modeling,and finite element analysis software ANSYS has been applied for the relevant analysis.The maximum stress of the suspended four-furrow plow has been obtained,which produces the largest value among the selected plows,relatively uniform stress distribution,relatively small plow column deformation and excellent modal performance,therefore,it has been selected as the benchmark for the design optimization.(3)To describe the commonly used methods of the design optimization,select the sensitivity the optimization program based on the accuracy analysis,and put forward the strength comparison design method,that is,the maximum stress of 102 MPa is the optimal constraint function,the deformation constraint in a reasonable range,the wall thickness is the random variable,the minimum quality as the objective function,thus to optimize the design of the other two types of plow frame,and finally obtain the optimization model.After optimization,the weight loss rate of the double-furrow tumbling plow frame is 10.14%,and the weight loss rate of the suspended three-furrow plow is 17.02%.Through the analysis,the optimized plow frame meets the design requirements of strength,minimum quality and center of gravity.(4)To verify the reliability of this comparative design approach,the study on the structural reliability has been carried out for the optimized furrow plow frame.With the Monte Carlo simulation analysis method,sample sampling has been conducted with the Latin hypercube sampling method,thus to obtain the probability distribution function of the random variables,eventually,the optimized reliabilities of the two furrow plow frame are 99.979% and 99.993%,respectively,the result has verified the new design method,as well as the reliability of the model optimization.Based on the design method of intensity quantitative comparison,this paper has provided a standardized design idea for the same type of agricultural machinery rack design with the same conditions of use.However,due to limitations in time and related conditions,the plow frame used as a benchmark still requires the further study.