| Due to the various process requirements, there is a wide range of press. Usually, common mechanical press can follow the requests of general process and perform many tasks, such as sheet metal punching, bending, shallow drawing, finishing and forging, etc. In terms of the thin sheet stretching, the traditional crank connecting type press could decrease the tensile strength of products and cause more waste. For setting off this disadvantages of traditional press, a type of stroke controllable press configurations has been designed by analysis and comparison the benefits and limitations of the mechanical press and hydraulic press, which also add in the advantages of multiple stem institutions. In the respect of this special stamping process, the stroke controllable press has better applicability and its nominal ability travel is bigger. Furthermore, its pressure stroke can be adjusted within in certain scope by following the request of process, and the travel times are relatively high.Through the analysis of existing press, movement characteristics and formability, the disadvantages of the existing press can be pointed out. Thus, a new configuration press can be proposed by studying existing press. The study of this paper starts with the structure of the new configuration press, expounds the principle of work and establishes transmission system mathematical model with kinematical analysis to the transmission system,through which the relationship between every input and output component of transmission system and the movement characteristics between components are gotten. In addition, the stress of the hinge components in linear equations is concluded with dynamics and statics analysis to component as well as components force and moment balance equation listed as per D’Alembert principle. Dynamic analysis to the components of transmission system as per the equivalent component model method, with establishment of equivalent mechanical model to transmission system components and solution to the equation of equivalent motion,the equivalent φ-ω and t-ω is obtained. Transmission system components specific length parameters and the movement parameters are set with the help of ADAMS software for the motion simulation analysis to its transmission system, the relationship of transmission system between input and output is verified, and the error sources is analyzed. Swing angle and velocity simulation curve of each component is obtained.With graphics analysis to craft process trip by Matlab and virtual prototype3D model build-up to the configuration of the application by SolidWorks, as well as virtual prototyping model simulation analysis by ADAMS software, the stamping process capacity curve, the slider trip itinerary curve, speed curve and acceleration curve are gained. With the help of Automation Studio, simulation analysis to hydraulic drive system and the selection of hydraulic components are gained; topological structure model to hydraulic system is created and the mathematical model of each subsystem is established. According to the hydraulic control circuit and craft operating routes, the PLC control scheme to the hydraulic system is decided. Finite element analysis to machine body by ANSYS software helps calculating the machine body angular distortion and its maximum stress.Based on the paper, physical prototype to controllable press trip has been developed successfully. According to the physical test results,combined with the characteristics of controlled press trip, the advantages and disadvantages and the processing range of the machine is given. |
PDF Full Text Request