A method for precision machining of aluminum-based silicon carbide threads

Abstract

The invention discloses a method for precise machining of aluminum-based silicon carbide threads. The method comprises the following steps: installing an ultrasonic longitudinal vibration machining tool handle on a machine tool, connecting an ultrasonic power supply to the ultrasonic longitudinal vibration machining tool handle, and The workpiece is clamped on the machine table; a 2-10mm drill bit is installed at the end of the ultrasonic longitudinal vibration machining tool holder to complete the thread bottom hole processing of the workpiece; the 2-10mm drill bit is replaced with a diamond-coated carbide tool for thread processing, Turn on the ultrasonic power supply; adjust the frequency of the ultrasonic power supply and the amplitude of the diamond-coated carbide tool mounted on the end of the ultrasonic longitudinal vibration processing handle to meet the separation conditions of the ultrasonic process; start the milling machine, and the diamond-coated carbide tool will press the set spiral The threaded hole of the workpiece is helically milled by the trajectory; the ultrasonic power is turned off, and the chamfering of the thread entrance and exit of the workpiece is milled out. The invention improves the quality of the surface of the threaded hole and the entrance and exit of the hole, improves the processing efficiency and reduces tool wear at the same time.

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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