Research On Ultra High Pressure Tube Hydroforming Equipment Key Technology

Along with the continuous development of the aviation industry and auto industry,the world energy crisis is going to be more and more severe, what is leading to pursuereducing the quality of the products to save the daily operation of the required energy, inorder to save cost and raw materials to continuously by the manufacturing. What ismaking Hydraulic Bulging Technology with lightweight and structure characteristics ofintegration has developed rapidly at home and abroad.This paper put forward on the system function and design requirements of internalhigh-pressure bulging pressure machine hydraulic, on the basis of analysis the internalhigh-pressure forming technology and internal high-pressure product failure mode.High pressure hydraulic system of internal displacement control key points-side urnwere put forward three schemes, and internal high-pressure bulging pressure formationand regulation also such. Contrasting the three schemes of comparison, analyzing theadvantages and disadvantages, choosing the optimum control scheme, on the basis ofwhich designs in high pressure bulging pressure machine set of hydraulic system, andthe key components for the selection and related performance, parameters areintroduced.This paper derived the valve controlled asymmetrical hydraulic cylinder of themathematical model and high frequency ring proportional valve, mathematical model ofthe valve controlling cylinder system. On this basis, the system carried out a detailedstatic and dynamic characteristics.Due to the side cylinder control precision of the system led directly to internalhigh-pressure bulging pressure machine the quality of the products, the paper uses twocontrol of the hydraulic cylinder way the system to make the simulation. The first is tocontrol is classic with the PID, Get a single-cylinder position control error and doublecylinder load conditions of synchronous control error; The second is a novel iterativelearning control, Get the no-load and load two cases single cylinder position control anddouble cylinder synchronous control error curve, good control effect, fully meet therequirements of system design. From the simulation results, using iterative learningcontrol is better than the single PID control precision.