Bending formation method of small-curvature bending radius L type thin-wall aluminum alloy bent pipe

TLDR: In this article, a bending formation method of a small-curvature bending radius L type thin-wall aluminum alloy bent pipe is described, where two ends of the bent inner side of a long pipe blank of an aluminum alloy thinwall pipe blank are grooved by 35-45 degrees, a protective agent is coated at the external of the pipe blank, oily molybdenum disulfide is sprayed in the semi-cylindrical surface of an area from the from part of the curved inner side to the front part pi D, so that a material on

Abstract: The invention discloses a bending formation method of a small-curvature bending radius L type thin-wall aluminum alloy bent pipe. Two ends of the bent inner side of a long pipe blank of an aluminum alloy thin-wall pipe blank are grooved by 35-45 degrees; a protective agent is coated at the external of the pipe blank; oily molybdenum disulfide is sprayed in the semi-cylindrical surface of an area from the from part of the bent inner side of the pipe blank to the front part pi D, so that a material on the bent inner side of the pipe is facilitated to flow and to improve wrinkling; a traditional polyurethane round bar is replaced; multiple polyurethane cylinder blocks are filled in the pushed end of the pipe blank; and compared with an integral polyurethane filler rod, the taking out is easier after formation, and the forming efficiency is improved. Meanwhile, the polyurethane cylinder blocks with proper hardness, thickness and diameter facilitate internal support of the bent pipe, and are not liable to generate wrinkles on the bent inner side; and the jacking force of a core head is reinforced during forming to supply enough internal pressure into the pipe through a filler to force a lot of materials to flow to the front groove so as to prevent wrinkling to form the qualified small-curvature bending radius L type thin-wall aluminum alloy pipe.