Discharge ablation machining method for difficult-to-machine metal materials based on quantitative high-pressure composite low-pressure intake system

Abstract

The invention provides an intractable metal material discharge ablation processing method based on a quantitative high-pressure and low-pressure combination gas inlet system. According to the method, a hollow electrode is used as an electrode for inducing ablation; certain relative movement speed is kept between a workpiece and the electrode; spark discharge is generated between the electrode and an intractable metal material under the effect of a direct current or pulsed power supply; the surface of the intractable metal material is enabled to at a temperature which is higher than a material burning point temperature so as to be in an activation state by use of spark discharge; then quantitative high-pressure and low-pressure combination combustion-supporting gas output by the gas inlet system is introduced into an activation region through the interior of the hollow electrode; continuously introduced low-pressure gas and the metal which is in an activation state are subjected to a strong burning reaction so as to release heat; as the released heat quantity is greater than the dissipated heat quantity, ablation processing can be continuously performed; intermittently introduced quantitative high-pressure gas enables a quantitative activated material to be subjected to a fire blast reaction. By virtue of the gas inlet system, ablation processing is in a process of ablating the materials by virtue of continuous low-pressure oxygen induced combustion and quantitative high-pressure oxygen controllable fire blast.

Description

Technical field: [0001] The invention relates to a discharge ablation processing method for difficult-to-machine metal materials based on a quantitative high-pressure composite low-pressure air intake system, which is applied to discharge-induced ablation processing and belongs to the technical field of special processing. Background technique: [0002] Since the beginning of the 20th century, with the progress of industrial production and science and technology, various new materials have emerged continuously. Many of these materials are difficult-to-machine metal materials, such as cemented carbide, titanium alloy, hardened steel, stainless steel, etc. They have the characteristics of high specific strength, high hardness, high temperature resistance, wear resistance, etc. These characteristics make traditional cutting processing impossible. meet its processing requirements. For example, in traditional mechanical cutting, these difficult-to-machine materials consume a lot...

AI Technical Summary

Problems solved by technology

If the output energy of the power supply increases, the efficiency of EDM will also increase, but the greater the output energy of the power supply, the greater the energy distributed to the tool electrode, the greater the corresponding electrode loss, and the worse the surface quality of the workpiece

Moreover, because the processing energy is limited by the energy output of the pulse power supply, and the processing area is concentrated near the small discharge channel, the heat transmitted to the substrate of the processed material is very limited and the utilization rate is low, so the processing efficiency is low.

At the same time, because traditional EDM uses kerosene and other working media, it will produce a series of environmental and safety hazards such as toxic gas emissions and flammability.

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