Composite threaded fastener and manufacturing method thereof

Abstract

The invention provides a composite thread fastener which comprises a head part and a rod part. The rod part comprises a core part and a thread part. The thread part comprises first longitudinal long fiber and peripheral long fiber, wherein the first longitudinal long fiber extends in the axial direction of the composite thread fastener and fluctuates in the radial direction of the composite threadfastener, and the peripheral long fiber is wound around the outer side of the first longitudinal long fiber in the peripheral direction of the composite thread fastener. An axial bearing face for theperipheral long fiber is formed on the first longitudinal long fiber fluctuating in the radial direction, the peripheral long fiber has high tensile strength in the axial direction, even if the peripheral long fiber is affected by large axial shear force, the semi diameter of the peripheral long fiber cannot be changed easily, thus wire slipping is prevented, and the first longitudinal long fiberis beneficial for improving the tensile strength of the longitudinal direction of a thread. In addition, when the thread fastener is screwed on, the thread is affected by large tangential force, theperipheral long fiber wound in the peripheral direction of the thread just has high tensile strength in the axial direction, and the tensile strength of the thread of the composite thread fastener isimproved beneficially.

Description

technical field [0001] The invention relates to a novel composite threaded fastener and a manufacturing method thereof. Background technique [0002] Because of its light weight, high specific strength, non-magnetic, excellent corrosion resistance, and strong assembly adaptability, composite screws are very suitable for the connection of non-load-bearing parts of composite structures in aerospace and other fields and require non-magnetic and corrosion resistance. The connection of components in the demanding electronic structure has been developed and applied by technological powers. Composite screws are different from conventional injection-molded screws, which overcome the disadvantages of low precision and poor mechanical properties of ordinary injection-molded screws. However, due to the complex processing of composite threaded fasteners, the forming accuracy is not easy to guarantee, which limits the application of composite fasteners. [0003] In order to meet the dem...

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Problems solved by technology

For example, the thread is formed by long fiber pressing, and then the thread is processed by machining, which weakens the axial tensile strength of the thread; if the screw and its thread are formed by pressing a single long fiber, but the torsional strength of the screw is low; The fiber is pressed into the core, and the short fiber is located outside the core and formed into a thread by pressing or machining, and the tensile strength and torsional strength of the screw are reduced; if the long fiber is pressed into the core, the outside of the screw is formed by winding the long fiber. The binding force between the thread and the core is low, and it is prone to misalignment, the tensile strength is weak, and the transmission effect of the internal force of the screw is poor

There is also the method of impregnating, curing and cross-linking the surface of the blank to form a modified coating to increase the strength, but this patent only uses long fibers as the filler of the composite matrix, and due to the gap between the composite matrix and the modified coating The thermal expansion coefficients do not match, the prepared modified coating has poor bonding with the composite material matrix, and it is easy to fall off during the rapid cooling and rapid heating process, which cannot achieve the effect of enhancing the strength of the threaded part, which will cause the threaded part to be damaged during extrusion and stretching. damaged in

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