Optimization Design For Oblique Five Hinge Joint-Double Toggle Clamping Unit Of Injection Molding Machine

In this article, an analysis of motional and mechanical characteristics for optimization design for oblique five hinge joint-double toggle clamping unit of injection molding machine is made by structure method, systematically making establishment of motional and mechanical model which includes the mold board stroke, the oil cylinder stroke, ratio of stroke, the speed variation coefficient, the force amplification, the maximum opening angle, the force of clamping, the critical angle, the systematical stiffness, the pushing force of closure oil cylinder and else. Based on above, overall and systematical optimization to clamping unit of which the force of clamping is 1000kN has been produced.During the optimization design of toggle increasing force unit, magnifying times of foree is regarded as the objective function in all multiple objective functions, other objectives functions are convert into condition of constraints. Adopt MathCAD soft that is able automatically to optimize goals to optimize clamping unit without making program by you. Provided that inputting original parameters, objective function as well as condition of constrains to computer, you will promptly gain results according to your aims. Save your time and energy. Compared with before optimization, outcomes of optimization increase 4% in the ratio of stroke and 14.5% in the force amplification.Utilize ANSYS to compute deflection of the each of moldboard stroke in infinite elements' method and then solve the systematical stiffness and the critical angle of clamping unit. Make an assumption that mould is rigid body; displacement of front and back mould board is zero in the near of hole of drag link; Displacement of motional mould broad supporting seat is also zero. Outcomes of calculating are source of satisfaction to technical demands. In addition, preliminary investigation is produced to reasonable distribution of structural component stiffness.In the past, according to experience people find a solution of the force of closure oil cylinder by plotting and test calculating, which is not only inaccurate but also wasting of timeand energy. It is too extremely difficult to solve in analysis. Because solution of foree of closure oil cylinder is one-dimensional problem, the article adopts relatively swift convergence way namely golden section to obtain the force of closure oil cylinder.Whatever they are medium-scale, small-scale or large-scale injection molding machines, all require larger ratio of stroke and the force amplification, which would not only obtain mould maximum board average velocity but also drop energy consumptions. From optimization results we can get it is obvious that motional and mechanical characteristics has been improved accompanied with ratio of stroke and the force amplification .So we will gain the highest efficiency at a cost of low energy consumptions.Ways of optimization design completely change previous designing ways which rely on experience, analysis and approximate calculating, emancipate designing people from the hard work and lay a foundation on CAD of injection molding machine.