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Controllable discharge ablation processing method for flammable and difficult-to-process materials with adjustable combustion-supporting gas concentration

A combustion-supporting gas and processing method technology, applied in metal processing equipment, electric processing equipment, circuits, etc., can solve the problems of low efficiency in the EDM process, reduce gas cost, improve processing efficiency, and reduce gas mixing time Effect

Active Publication Date: 2020-09-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The invention mainly solves the problem of low efficiency in the electric discharge machining process and the stability of the combustion and erosion process of flammable and difficult-to-machine materials such as titanium alloys, and realizes the integrity and high-efficiency ablation processing of parts and components of flammable and difficult-to-machine materials. Objective To invent a controllable discharge ablation processing method for flammable and difficult-to-machine materials with adjustable combustion-supporting gas concentration

Method used

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  • Controllable discharge ablation processing method for flammable and difficult-to-process materials with adjustable combustion-supporting gas concentration
  • Controllable discharge ablation processing method for flammable and difficult-to-process materials with adjustable combustion-supporting gas concentration
  • Controllable discharge ablation processing method for flammable and difficult-to-process materials with adjustable combustion-supporting gas concentration

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Embodiment example 1

[0045] The present invention will be further described below by taking discharge ablation forming as an example.

[0046] The system schematic diagram of the mixed gas medium generating device with adjustable combustion-supporting gas concentration used in the specific embodiment of discharge ablation forming processing according to the present invention is as follows figure 2 shown.

[0047] The workpiece material is made of titanium alloy TC4 for EDM processing. The specific processing parameters are as follows: figure 1 shown.

[0048] In this example, the combustion-supporting gas is oxygen, and the impurity gas is argon.

[0049] The gas concentration adjustable titanium alloy discharge ablation processing method of the present invention, the specific steps are as follows:

[0050] The first is the generation of mixed gas for discharge ablation machining, refer to figure 2 The mixed gas generation device system with adjustable combustion-supporting gas concentration...

Embodiment example 2

[0056] In this example, nitrogen is selected as the impurity gas, and oxygen is selected as the combustion-supporting gas. The source of nitrogen is air, and the proportion of nitrogen in the air is 78%. Therefore, during the ablation process of titanium alloy, air can provide abundant nitrogen. source of impurity gases. Nitrogen accounts for the vast majority in the air, and oxygen accounts for 21%. Therefore, when using the mixed gas medium generator system of the present invention for mixing, the oxygen content in the air medium needs to be considered. In this case, it is assumed that the pressure ratio of nitrogen and oxygen in the mixed gas is 1:5, and the volume percentages of nitrogen and oxygen in the air are 78% and 21% respectively. Based on the above data, the relevant formulas are obtained, as follows: specific derivation process.

[0057] Suppose x is the pressure of nitrogen in the mixed gas, y is the pressure of air mixed in, and the pressure of pure oxygen int...

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Abstract

The invention provides a controllable discharge ablation method for a combustible difficult-to-process material and with adjustable combustion-supporting gas concentration. The method is characterizedin that a mixed gas medium provided by a special combustion-supporting gas concentration adjustable gas supply device is introduced before processing; during processing, inter-pole voltage required to breakdown the mixed gas medium is supplied to two poles through a pulse power supply, and required energy is provided for melting and gasification of an inter-pole workpiece material; after a metalmaterial forms a high-temperature molten material, the high-temperature molten material and combustion-supporting gas in the mixed gas medium are subjected to a severe oxidation chemical reaction, a large amount of chemical energy is generated, extra ablation energy is introduced for efficient material ablation, and therefore the material removal rate of the combustible difficult-to-process material is improved under the condition that the discharge energy of the pulse power supply is certain. By means of the special gas supply device, the concentration of the combustion-supporting gas participating in the oxidation reaction is controlled, the explosion phenomenon caused by violent combustion in the processing process is avoided, the damage of a machined workpiece is avoided, and controllable and efficient processing of the combustible difficult-to-process material is achieved.

Description

technical field [0001] The invention relates to a controllable discharge ablation machining method for flammable and difficult-to-machine materials with adjustable combustion-supporting gas concentration. It is a high-efficiency machining method based on conventional electric discharge machining. Controlled, efficient machining of metals. Background technique [0002] With the rapid development of aerospace, national defense and other fields, more and more new metal materials and structural features have been applied, and the proportion of highly active and difficult-to-process materials such as titanium alloys and magnesium alloys is increasing. Due to the characteristics of high strength and low thermal conductivity, titanium alloys have serious tool wear and low processing efficiency during cutting; magnesium alloys are a kind of metal materials with active chemical properties, which are prone to combustion, deformation and oxidation corrosion during cutting. serious. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H1/00B23H1/02
CPCB23H1/00B23H1/02
Inventor 邱明波孔令蕾王文昭
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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