Structure Design And Research Of Diesel Engine Cylinder Head Assembly Platform

With the development of science and technology and economy in China,intelligent manufacturing is more and more favored by the manufacturing industry.For the manufacturing of diesel engine parts,China’s automation level has been in the international higher level,but for the assembly of diesel engine cylinder head,most enterprises still stay in the manual assembly stage,which leads to low assembly efficiency of products,low assembly accuracy,large capacity load and other problems.Therefore,in order to realize the automatic assembly of diesel engine cylinder head,according to the assembly process of a diesel engine cylinder head,the assembly platform for the automatic assembly line of diesel engine cylinder head is designed.In order to check the strength and stiffness of the key parts,the finite element analysis is carried out,and the structure and size are optimized according to the results.In order to analyze the motion characteristics of cylinder head during assembly,the kinematics model of assembly platform was built for kinematics simulation analysis.The specific research contents include :(1)According to the assembly process requirements of the cylinder head,this paper confirmed the overall design plan of the assembly platform by comparing the advantages and disadvantages of various assembly platform motion schemes,and designed the main functional components of the flip mechanism,the frame and the hydraulic assembly aid.According to the shape of the cylinder head,the automatic clamping scheme of the diesel engine cylinder head was selected and designed.Through calculation,the standard parts and standard equipment in the assembly platform were selected,and the strength of the threaded connection of the key parts was checked.The solid model of the assembly platform was established using 3D modeling software,and the assembly process of the cylinder head on the assembly platform was planned.(2)Aiming at the key parts of the assembly platform,the static strength analysis was carried out by using the finite element analysis software.According to the results of finite element analysis,the parts and components that do not meet the requirements of material strength and stiffness in the equipment were optimized.In order to reduce the quality of overturning mechanism and the manufacturing cost of assembly platform,under the condition of satisfying the strength and stiffness,aiming to reduce the weight of the overturning mechanism,the parameters of the positioning plate and the front plate of the mechanism frame in the overturning mechanism were optimized by using the multi-objective driven optimization design module in the finite element software.(3)In order to analyze the motion characteristics of cylinder head during assembly,a virtual prototype of assembly platform was created,used Recur Dyn software to perform kinematics simulation on the movement process of the assembly platform,writed driver function,and simulated the movement process of the assembly platform when the cylinder head was assembled.Several groups of data were compared to simulate the rotation and linear motion process of the overturning mechanism,and according to the simulation results,the relationship between the driving torque and the rotational angular velocity and angular acceleration during the rotation of the turning mechanism,and the relationship between the driving force and power and the friction coefficient of the guide rail during the linear motion of the turning mechanism were obtained.