Super-plastic expansion anti-oxidation program control precise loading experiment device and method

Abstract

The invention relates to a super-plastic expansion anti-oxidation program control precise loading experiment device and an experiment method. The device mainly consists of an anti-oxidation air source, two paths of loading air paths, a preheating and heating device, an edge pressing mold required by expansion and the like, wherein the loading air paths have the pressure test and control functions and respectively consist of precise pressure reducing valves, step motors, increment type rotating encoders, pressure sensors, high / low-pressure pressure switches, electromagnetic reversing valves and corresponding driving and control systems, the precise pressure reducing valves are driven by the step motors, and the encoders detect the motor rotating angle. The control systems control to complete various loading modes including the constant pressure, variable pressure, pressure saltus and the like. The high / low-pressure pressure switches are combined with a digital logic circuit for forming a safety protection device, and the damage and the pressure overload caused on the precise pressure reducing valves can be prevented. The loading device can adopt closed loop serial PID (proportion integration differentiation) control for the pressure regulation, the loading process is safe and reliable, and higher control precision and better response characteristics can be realized in the pressure regulating process.

Description

Technical field: [0001] The invention relates to a loading device and method for a superplastic bulging experiment, which is particularly suitable for a high-temperature anti-oxidation superplastic bulging program-controlled precision loading experimental device, and is also suitable for the actual production and trial production of superplastic forming. Background technique: [0002] Superplastic bulging technology occupies an important position in the fields of aviation, aerospace, automobiles and precision instruments, and has a good development prospect. The experimental device for superplastic bulging must be able to measure the variation of the free bulging pole height with time or pressure. Since the superplasticity of metals has little deformation resistance at the optimum superplastic temperature, the initial superplastic bulging experimental device They are all obtained by the change of the displacement of the ejector rod in contact with the pole of the free bulgin...

AI Technical Summary

Problems solved by technology

Due to the strong temperature sensitivity of metal superplasticity, the deformation resistance at high temperature is very small, and the pole is the most severely thinned area. Therefore, the experimental test failed due to the inability of the bulging part to lift the ejector pin

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