The microcomputer control is adopted with strong functions, high extensibility, English subtitles and dialogue-based operation, easy to learn and understand. Set speed by segmentation with high precision of elbow plpos. The sixteenth level elbow pipe data setting and storage, and remarkably smooth assembly of work pieces of many angles. The functions of reloading with auxiliary shoving and slowly retuming the core can beachieved. The thin-wall pipes can be bent and manufactured. Extensively used in large ship building and repair, boler, petroleum pipeline and auto spare parts