A preparation method of hot-press stress-hardened tubular parts of galvanized sheet

The invention discloses a method for preparing a hot-pressed stress-hardened tubular part of a galvanized sheet. The initial pipe is obtained by slitting and rolling the pipe, and the initial pipe is heated to a certain temperature and time to ensure that the initial pipe is completely austenitized; C: the heated initial pipe is transferred to the mold, and both ends are sealed and filled with a certain pressure P Compressed air; D: During the mold clamping process, the two ends of the closed pipe are under the action of the hydraulic drive device or the wedge of the mold to ensure the appropriate feeding amount L, and ensure that the inner coating of the pipe is always in a state of compressive stress along the pipe axis ; E: After forming, the mold maintains pressure to realize the rapid exchange of heat between the tubular sheet and the mold to realize quenching. The invention solves the problem of LMIE cracking during the forming process of the galvanized sheet tubular parts, and improves the corrosion resistance of the tubular thermoformed parts during service.