Preparation method of small-hole thread made of high-volume-fraction aluminum-based silicon carbide composite material

Abstract

The invention discloses a preparation method of a small-hole thread made of a high-volume-fraction aluminum-based silicon carbide composite material. The preparation method comprises the following steps of 1) machining a high-volume-fraction aluminum-based silicon carbide part until the margin of a single side is 2 mm; 2) machining a plug hole in the high-volume-fraction aluminum-based silicon carbide material; 3) machining a spiral line on the surface of a titanium column; 4) observing the inner surface of the hole; 5) pre-coating a bottom hole of the composite material with a brazing fillermetal; 6) cleaning the surface of a titanium alloy with alcohol, and coating the surface of the titanium column with the brazing filler metal; 7) brazing the titanium column and the high-volume-fraction aluminum-based silicon carbide; 8) performing stress-relief heat treatment after welding; 9) machining the end surface to the final size after brazing of the high-volume-fraction aluminum-based silicon carbide composite material and the titanium alloy column is completed; 10) detecting whether a weld joint area is qualified or not through a 50-time video microscope and X-rays on the appearanceof a weld joint after brazing of the high-volume-fraction aluminum-based silicon carbide composite material and the titanium alloy column is completed; and 11) machining a threaded hole bottom hole with the corresponding specification in the welded titanium column, and performing tapping.

Description

technical field [0001] The invention relates to the field of precision machining of composite materials, in particular to a method for preparing small-hole threads of high-volume-fraction aluminum-based silicon carbide composite materials, and belongs to the related technical fields of precision (special) processing and the like. Background technique [0002] Aluminum-based silicon carbide composite materials, especially high-volume aluminum-based silicon carbide materials have high specific strength and specific stiffness, low thermal expansion coefficient (≤8×10 -6 / °C), low density, high yield strength, good dimensional stability, thermal conductivity (≥190W / m / K), and excellent mechanical and physical properties such as wear resistance and fatigue resistance, are widely used in aerospace, weapons, automobiles, etc. And other fields have been widely used, such as packaging shells of military electronic products, military high-stable optical-mechanical structural parts, mil...

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is: in order to solve the problem that processing defects are easy to occur when processing threads, especially small threads, on aluminum-based silicon carbide materials with high volume fraction, and even if the thread is processed, it cannot be used in the occasion of repeated disassembly, providing a high volume fraction The preparation method of the small-hole thread of the aluminum-based silicon carbide composite material is achieved by brazing a titanium alloy column on a high-volume-fraction aluminum-based silicon carbide material, tapping a threaded hole on the titanium column, and controlling the size of the plug hole and the titanium column. Precisely control the content of titanium alloy, and greatly improve the machining accuracy, quality and efficiency of the thread without significantly reducing the linear expansion coefficient of the material and increasing the quality properties of the material

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