Design And Optimization Of Multi-bar Heavy-duty Stamping Machinery

With the comprehensive promotion of the "made in China 2025" strategy,the task of cultivating innovative talents is becoming more and more urgent.However,the previous single and solidified traditional higher education is obviously not applicable in the ever-changing science and technology environment,so the reform of university basic education is imperative.Taking a series of stamping machinery products as the engineering design carrier and experimental application background,the theoretical research,design and manufacturing,virtual simulation and experimental verification are integrated into a whole.In order to carry out a new type of teaching experiment which integrates design,synthesis and research,a comprehensive Mechatronics experimental test platform is designed and developed,It is of great significance to promote students to master modern design methods and processes,and cultivate students' ability to solve complex practical engineering problems.In this paper,the main motion configuration design,scale optimization,structure design and verification of the heavy-duty press in the series of stamping machine experimental platform are carried out;Based on multi-body dynamics,the optimization design of motor flywheel system is carried out,and the static structure and dynamic characteristics of some components and fuselage are analyzed(1)According to the design requirements of the heavy-duty mechanical press,firstly,the main motion configuration of the heavy-duty mechanical press is studied,and the motion characteristics of different main motion schemes are compared.Finally,the crank triangle connecting rod elbow mechanism is selected.Secondly,the configuration characteristics are analyzed to improve the mechanical benefit characteristics,and the influence of crankshaft rotation center offset and "staggered peak design" on the mechanical benefit is studied,With each motion scale as the independent variable,the main goal is to maximize the mechanical benefits of the main motion scheme,and the secondary goal is to minimize the velocity fluctuation in the stamping stroke.The main motion scale scheme is obtained by Adams with its own optimization solver.(2)Considering the motion mode of each component and the link mode with the surrounding components,and referring to the experience design and verification theory,the structural configuration selection,structural design and verification of the main motion components and the fuselage are completed.The main motion mechanism components include crankshaft,triangular connecting rod,upper and lower elbow bar and slider,In the fuselage design,a new mold adjusting mechanism is proposed to adjust the height of the worktable to complete the mold adjusting action,which avoids the weak and relatively low strength thread fit in the past,as well as the design and check of the bed and base.(3)Based on ADAMS virtual simulation technology,the ideal drive is added to calculate the total power consumed by the press in a single cycle.According to this,the inherent mechanical characteristic curve of the motor is derived,and the accurate motor power module and pulley belt transmission module are established to solve the dynamic performance of the multi rigid body system of the press.The system speed fluctuation coefficient,motor heating energy consumption and flywheel volume are taken as the evaluation indexes,This paper presents a new optimization design method and process of motor belt drive flywheel system to solve the problem of rough calculation and design of flywheel based on empirical formula.(4)Considering the influence of excessive clearance brought by multiple connecting rods on the dynamics of mechanical pressure,the dynamic model of virtual prototype is established by combining nonlinear spring damping contact force and Coulomb friction force with a two-state clearance rotating pair model.The dynamic characteristics of ideal mechanisms without clearance and with clearance are analyzed,and the corresponding loads of different components under extreme working conditions are extracted,Through ANSYS finite element analysis software,the static strength of crankshaft,triangular connecting rod and key parts of machine bed are analyzed.