Research On Dynamic Characteristics For Main Driven System Of A Multi-Link Servo Mechanical Press

The vigorous development of the equipment manufacturing industry provides a broad marketspace for the forging equipment, the traditional crank-slider mechanism with its advantages of simplestructure and convenient maintenance has occupied a huge share of the early domestic press industry.With the development of electronic technology, as well as in-depth study of the multi-link technology,mechanical multi-link servo press has increasingly become the development trend, and is widely usedin machinery, aircraft and vehicle etc. As the high speed requirements of production continue toincrease, domestic and foreign scholars conducted a lot of theoretical and experimental research aboutthe effects on the dynamic characteristics of the mechanism system with the flexibility and clearance,the related work of all has the obvious theoretical and engineering guidance for product design andequipment maintenance.The kinematics and dynamics as well as their inverse problem of six bar linkage mechanism withideal joints are completely analyzed on the paper, on the base of which, completes the dynamicsimulation of mechanism with clearances based on the virtual prototyping technology. The researchresults are as follows:Firstly, based on the plural vector method, add the position relationships of linkages to thekinematic model as a supplementary constraint equation, to avoid the problem of multiple positionsolutions and complicated trigonometric function derivation. Put forward the "representative point"method, take the length of the bar as the constraint conditions, establish the inverse kinematic model,through the method of solving the Jacobin matrix, obtain the functional relationship between therotation angle of crank and the displacement of slider, and using the method of virtual displacement,establish the internal relationship between the torque on the crank and the pressure on slider in thestatic conditions. Through a set of simulation in the digital analysis software named MechanicalSystems, to validate the analytical solution, completing the kinematic analysis of mechanismsystematically.Secondly, considering inertia parameter, equations of torque and force balance are establishedbased on Newton Euler method, the relationship between the motion and joint force is obtained inMathematica with its powerful ability of symbolic derivation. Based on the Lagrange method,completes the dynamics modeling of the system. Constraining force curves in the joint is obtained bythe way of a dynamic simulation in ADAMS, which verifies the above analytical process. Finally, Systematically review the traditional research model of joint clearance, dynamic modelfor the object of the study in this paper is selected. Dynamic simulation has been done in ADAMS toin-depth study the dynamic characteristics of mechanism with rotational and translational clearancejoints. The paper analyzes the reason for the phenomenon that the slider may be engender self-locking,some improvements were proposed by analyzing the strength situation of the system, which providesa valuable theoretical guidance for engineering application.