Compound material special piece molding method and molding central spindle

Abstract

The invention provides a moulding method for composite material irregular pipe fitting and a moulded pivot thereof. The support pivot made of the materials with low softening temperature and high melting point is arranged at the irregular position of a pipe, which is matched with the irregular position in shape. Macromolecule composite carbon fiber is coated on the support pivot so that the thickness of the support pivot reaches the required thickness of the shell of the pipe before the coated support pivot is arranged in a forming die; the support pivot is arranged in a blast pipe for heating and extrusion forming; after the pivot is cooled, the melted and deformed support pivot is taken out from the pipe, thus completing the forming process of the irregular pipe fitting. By adopting the support pivot, flexible macromolecule composite carbon fiber can be braided and preformed according to the shape, and the fiber grain direction when the macromolecule composite carbon fiber coils yarn is ensured. While hot air is fed to the blast pipe and the blast pipe is pressurized so that the macromolecule composite material is melted and shaped, the support pivot with low softening temperature and high melting point is melted and deformed; after the formed irregular pipe fitting is cooled, the support pivot is deformed and broken; subsequently, a tool is used for taking out the broken support pivot from the irregular pipe. The disposable support pivot brings convenience to moulding of irregular pipe fittings.

Description

technical field [0001] The invention relates to a method for forming pipe fittings by using polymer composite materials, in particular to a method for forming composite special-shaped pipe fittings and the forming mandrel. Background technique [0002] In traditional bicycles, the entire vehicle frame is made of metal pipe fittings, but the bicycle with this welded metal structure has a heavy body and poor fatigue resistance. Therefore, in order to reduce the weight of the vehicle body and increase its fatigue resistance, the entire vehicle frame is made of light-weight, high-strength polymer composite carbon fiber material. [0003] At present, the common molding method of polymer composite frame is to preform each straight tube of the frame separately, and then splicing at the special-shaped parts, and then heat-fix the splicing parts after yarn patching and reinforcement. for the entire frame. The reason for adopting this splicing method is that the special-shaped part ...

AI Technical Summary

Problems solved by technology

[0004] However, when each straight pipe fitting is spliced ​​at a special-shaped place, it is necessary to cut out the matching gap before the lap can be performed. Due to the material characteristics of the preformed pipe fittings, its strength and hardness are high, so it is more laborious and difficult to cut out the fitting gap. The manufacturing process is cumbersome; in addition, the mending yarn at the splicing part must reach a certain thickness to meet the connection strength of the special-shaped part, which will increase the weight of the entire frame and the overall appearance is not strong

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