| Superplastic bulging is one of the important superplastic forming technology,is an advanced manufacturing technology. Superplastic bulging plays an important role both in theoretical study and practical application of superplastic mechanics, however there is no complete theory of sup- erplastic bulging,so still need more in-depth study, how to develop high-precision superplastic bulging test equipment and bulging pieces image measuring device is very important. The article mainly concerns the superplastic bulging device's improvement designing,image measuring device's designing,image processing,bulging pieces surface analysis,did the following work:1. Designed the hydraulic machine auto press side device with PLC, programed the PLC pr- ogramme and made the bulging press side controling more convenient.2. Improved the experimental device,changed the out of furnace single heating to out of furnace heating and in furnace heating at the same time,improved the thermal efficiency. The equipment is simple,easy to operate and reduced the design cost.3. Redesigned the control system,using the temperature controller to control the temperature directly,reducing the microcontroller control tasks,so the gas pressure controling is more accurat- e and the experimental results is more precision.4. Make specific description of the image measurement device's designing, hardware comp- osition and the basic principles of image measurement. Detaily analyse the superplastic bulging contour image calibration and image processing.5. Detaily analyse the superplastic bulging contour curve fitting and introduced the bulging surface analysis with fitting curve.
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