The Finite Element Analysis And Optimization Design Of M300 Pull-Press Spring Testing Machine

The spring testing machine test rigidity is through displacement of measured spring under the known loading function. In order to enhance M300 to pull presses the spring testing machine's test precision, satisfies the user community the demand, the most important task enhances testing machine's structure rigidity, reduces its crossbeam structure under the work load function amount of deflection. Under the Professor Chen Shuxun instruction, this article author has completed this testing machine structure finite element analysis and the optimization design, has provided the theory basis for this testing machine structural design quality's enhancement.The M300 pull-press spring testing machine adopt the door-type structure, the maximal work load is 300kN. Because the testing machine structure for many spare part composition's assembly structure, between various spare parts both must just met and the non-hinge, but through way connections and so on tie bolt, bearing, between various spare parts has the massive contact problem. This causes this structure analysis to turn the complex contact nonlinear analysis question, needs to use contacts the vice-unit and carries on the massive iterative computation; Moreover the testing machine structure analysis also has the bold fastening the pretightening up force to exert questions and so on equivalent stiffness which, equivalent elasticity coefficient as well as the bearing connects. This article studied the successful solution above question, has completed this spring testing machine finite element analysis modelling work. And has carried on the structure finite element analysis successfully using finite element analysis software ANSYS to this testing machine's two kind of biggest experimental load operating mode, obtaining under various operating modes the structural stress distribution and the stress big hazard point and various crossbeams Y-axis displacement, namely various crossbeams' amount of deflection, has laid the foundation for this testing machine's structure optimization.To this testing machine's structure optimization, the factory requests the testing machine periphery size constancy, seeks the testing machine internal structure the design proposal, reduced its crossbeam structure as far as possible the amount of deflection, for this reason, the author acts according to the structure different spot size to the crossbeam amount of deflection influence as well as the structural stress distribution choice appropriate design variable, the constraints and the objective function, establishes this structure the optimization design mathematical model; Through enveloping of the constraints, the optimization method of Guide-weight method and ANSYS combined were applied in the project, completed the testing machine structure component size optimization design. In the construction weight invariable and satisfies the material allowable stress under the premise, when testing machine full load pressure test, the Y-axis deformation of crossbeam and pressure plate from 0.320mm to 0.199mm, descended by 37.8%; When testing machine full load tension test, the Y-axis deformation of crossbeam and pressure plate from 1.372mm to 0.290mm , descended by 78.9%. The optimized effect is very remarkable, we has completed this spring testing machine's optimization design tasks.