FRP sleeve processing method, processing device and drill bit

Abstract

The invention belongs to the technical field of boring of nonmetal mould pressing materials, in particular to a method, a device and a drill for machining a glass reinforced plastic sleeve. The machining method includes steps of positioning a center hole, fixing a glass reinforced plastic sleeve blank, pre-drilling the center hole, drilling a bottom hole of the center hole, roughly drilling the center hole, roughly boring an inner round hole, fine boring the inner round hole, roughly boring a stepped round hole and fine boring the stepped round hole to finally machine the glass reinforced plastic sleeve blank into a qualified glass reinforced plastic sleeve. A boring machine fixture of the machining device comprises a positioning body and a transitional sleeve, wherein the positioning body is fixed onto a boring machine, the transitional sleeve is mounted in a positioning hole of the positioning body, and a first oblique plane at the upper end of the positioning body flushes to a second oblique plane at one end of the transitional sleeve. A spiral edge of the drill for machining the glass reinforced plastic sleeve is in an inverted conical shape, and a cone angle ranges from 1 degree to 3 degrees. The method, the device and the drill for machining a glass reinforced plastic sleeve solve the problem of nonuniformity in stress of the surface of the glass reinforced plastic sleeve during machining and are low in part scrappage and high in machining efficiency, and matched devices for machining are simple in structure and convenient to use.

Description

technical field [0001] The invention belongs to the technical field of boring processing of non-metal molded materials, and in particular relates to a processing method for a glass fiber reinforced plastic sleeve, a processing device and a drill bit. Background technique [0002] High-tech products such as launch vehicles and missiles of aerospace vehicles will generate a lot of heat during flight, which will affect the normal operation of instruments and meters in the product, make electronic components invalid, and threaten the normal flight of the product. For this reason, non-metallic materials are generally used for thermal insulation of electronic components. The fiberglass sleeve is exactly the part installed in the gas rudder system for heat-proof and heat-insulation of the negative thrust nozzle. The FRP sleeve is a FRP product that is mixed with glass fiber cloth and resin in a certain proportion, molded into a blank with a mold, and then machined into the inner h...

AI Technical Summary

Problems solved by technology

The existing technology is to fix the FRP sleeve blank on a boring and milling machine and then process it with a cutter. When fixing the FRP sleeve blank, two flat jaws of a universal vise are used to clamp the two sides of the waist-shaped cylinder, and then Drilling or milling, it is difficult to clamp and align. When clamping, the waist-shaped cylinder is clamped, and the part is radially stressed, which will produce elastic deformation. After processing, the inner hole of the part in the clamped state is qualified. When the part is removed After that, the elastic deformation of the inner hole affects the shape and position accuracy and dimensional accuracy of the processed parts.

Moreover, when cutting an elliptical cross-section, the tool changes from continuous feed to intermittent feed, and the processing surface of the part is subjected to uneven external forces. When cutting out, the knife teeth will lift up the material, causing slag, chipping, and cracking, which will make the surface quality of the finished part low

At the same time, due to the anisotropy of the glass fiber in the FRP material, the cutting process is easy to cause the delamination and degumming of the tissue, which adds certain difficulties to the cutting process, especially the chemical components of the glass fiber, such as silica and alumina, are FRP The hard spots in the material have high hardness, and the wear on the tool is particularly serious. When machining deep holes with high precision requirements, it is not allowed to use oil, water and other coolants. The cooling conditions are poor, and the processing and cutting The heat is not easy to dissipate. At the same time, because the resin is not resistant to high temperature, during the high-speed cutting process, the cutting temperature is high. Slag, chipping, cracking, the qualified rate of finished parts is very low

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