Aluminum-based silicon carbide thread precision machining method

Abstract

The invention discloses an aluminum-based silicon carbide thread precision machining method. The method comprises the following steps that an ultrasonic longitudinal vibration machining cutter handleis installed on a machine tool, an ultrasonic power source is connected with the ultrasonic longitudinal vibration machining cutter handle, and a workpiece is clamped on a machine tool workbench; a 2mm-10 mm drill bit is installed at the tail end of the ultrasonic longitudinal vibration machining cutter handle, and threaded bottom hole machining of the workpiece is completed; the 2 mm-10 mm drillbit is replaced with a diamond coating hard alloy cutter for thread machining, and an ultrasonic power source is started; the frequency of the ultrasonic power source and the amplitude of the diamondcoating hard alloy cutter carried at the tail end of the ultrasonic longitudinal vibration machining cutter handle are adjusted to meet the separation condition of the ultrasonic technology; a milling machine tool is started, and the diamond coating hard alloy cutter spirally mills a threaded hole of the workpiece according to a set spiral track; and the ultrasonic power source is shut off, and thread inlet and outlet chamfers of the workpiece are milled. By means of the aluminum-based silicon carbide thread precision machining method, threaded hole surface and hole inlet and outlet quality is improved, the machining efficiency is improved, and meanwhile cutter abrasion is reduced.

Description

technical field [0001] The invention belongs to the technical field of special precision machining, and in particular relates to an aluminum-based silicon carbide thread precision machining method. Background technique [0002] Silicon carbide particle reinforced aluminum matrix composite material (hereinafter referred to as SiCp / Al) is composed of matrix material (pure aluminum or aluminum alloy) and reinforcing material (silicon carbide particle), and is a material with new properties prepared by a certain process. SiCp / Al has excellent physical and chemical properties: high specific strength, specific stiffness, specific modulus, low density, low thermal expansion coefficient, good dimensional stability, good electrical and thermal conductivity, wear resistance and fatigue resistance, etc. It has been widely used in aerospace related products. However, its excellent mechanical properties make the machinability of SiCp / Al poor. When SiCp / Al is cut, due to the existence of...

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Problems solved by technology

[0003] SiCp / Al threaded holes can be processed by traditional tap tapping or low-frequency vibration tapping, but the problem of tool wear is obvious, the tap is easy to break, the hole quality cannot be guaranteed, and waste products are prone to occur; internal thread grinding wheel grinding can ensure the threaded hole quality, but such traditional processing methods still have not solved the problems of severe tool wear and low processing efficiency

The current processing methods for SiCp / Al threaded holes still have certain deficiencies in quality and efficiency, and it is necessary to find a new method to solve the problem of SiCp / Al threaded hole processing

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