Dynamic Simulation And Life Research Of Key Components Of Multi-Connected Crank-Slider-Plunger Forming Machine

Most of the existing molding machines at home and abroad have complex structures,poor interchangeability of parts,and low extrusion efficiency.The research group Proposes a multi-connected crank-slider plunger forming machine（patent number CN201811333470.4）.Based on the forming principle of the patent,this thesis conducts reasonable structural design,modeling analysis,and establishes the output of the whole machine through theoretical derivation and calculation.Power and energy consumption models,and kinematic dynamics simulation,fatigue life research and modal analysis of its key components,the slider plunger.In Creo Parametric 6.0.0.0 software,the specific structural design of the slider plunger,connecting rod,crank and other components is completed according to the target function,and each component is assembled to establish a three-dimensional multi-connected crank slider plunger compressor.On the basis of this model,the motion diagram of the mechanism is drawn,and the derivation formula is established according to the model structure parameters and the knowledge of plane geometry to analyze the motion interference of the mechanism,study its motion characteristics,determine the equation of motion of the slider and plunger,and further deduce the sliding motion.The block speed formula and the curve fitting function of the origin software are used to obtain the resistance,the theoretical derivation and calculation of the rated power of the molding machine equipment are carried out,the power and time curves are drawn using Matlab,and the production power model and energy consumption model of the entire molding machine are established.It is concluded that the maximum output power of the molding machine is7.54kw,and the maximum productivity is 428.04kg/h,and on this basis,the theoretical energy consumption of the molding machine is calculated to be 18.69 kw h/t,which is similar to the energy consumption of the domestic traditional piston stamping molding machine.Compared with 70 kw h/t,the energy consumption is significantly reduced.In the Adams dynamics simulation software,the rigid body kinematics and dynamics simulation model of the molding machine is established based on the virtual prototype technology,and the kinematics and dynamics simulation analysis is carried out on it,and the movement process is reasonable.The maximum displacement stroke of the slider plunger is 160mm,the average movement speed is 0.133m/s,and the output rated power of the molding machine is 7.38kw,which is roughly consistent with the theoretical derivation.Through Ncode Design Life and Workbench software,the fatigue life research and modal analysis of the key components of the slider plunger are carried out,and the fatigue damage and life results of the slider plunger are obtained:the maximum total damage is3.316×10^-6,so the structural design conforms to the safety and reliability.The minimum number of cycles in the lifetime is 2.64×10⁴ times,which fully meets the requirements of the lifetime（10⁴）,and the minimum number of cycles occurs at node 101793.The modal parameters and mode shapes obtained by modal analysis show that the lowest natural frequency is 1392 Hz.In order to effectively avoid resonance and prevent fatigue damage of components,the lowest natural frequency of the component should be controlled to be less than 1044 Hz or greater than 2088 Hz.It provides a reference for the subsequent optimization of the slider plunger.