A kind of green and efficient EDM working fluid

Abstract

The present invention belongs to the field of special processing, and specifically, relates to an upward-looking green and efficient electrospark machining working fluid, which is composed of aluminum zinc phosphate rust inhibitor, sucrose, compressed air and deionized water. During preparation, the aluminum zinc phosphate rust inhibitor is firstly uniformly mixed with deionized water according to the required proportion to obtain the matrix solution A required by the present invention; then the sucrose is uniformly mixed with the matrix solution A according to the required proportion to obtain the matrix solution B; then the matrix solution B is mixed with compressed air according to the inlet pressure requirement through a venturi tube to obtain a mixed working fluid C; finally, the above-mentioned mixed working fluid C is passed through an ultrasonic generator through a pipeline to obtain the required upward-looking green and efficient electrospark machining working fluid mixed with fine compressed air bubbles. The upward-looking green and efficient electrospark machining working fluid of the present invention has the advantages of high dielectric strength, safety, greenness and pollution-freeness, high machining efficiency and good machining surface quality, and can meet the use requirements of upward-looking green and efficient electrospark machining.

Description

Technical Field

[0001] The invention belongs to the field of special machining, and in particular, relates to an upward-looking green and efficient electrospark machining working fluid. Background Art

[0002] Working fluid is an important part of EDM technology. It has the functions of cooling the workpiece and electrode, achieving inter-electrode deionization, and discharging the erosion products in the discharge gap. It will greatly affect important processing effect characterization quantities such as EDM efficiency, electrode relative loss rate, and workpiece surface quality. At the same time, with the advancement of science and technology and the development of society, people pay more attention to the performance of working fluid in terms of safety of use and environmental friendliness. At present, the working fluids commonly used in EDM at home and abroad include two categories: oil-based working fluids and water-based working fluids.

[0003] Oil working fluids mainly include kerosene, special mineral oils, and synthetic oils. Kerosene has high dielectric strength, low viscosity, and good fluidity, and is often used in EDM, but it is highly volatile, has a strong odor, and has a low flash point, posing safety hazards such as fire. Special mineral oils contain aromatic hydrocarbons, which have defects such as strong odor and irritation to human skin. Synthetic oils mainly include normal alkanes and isoalkanes, which are water-white and translucent, and have basically no odor. Adding additives can effectively improve processing efficiency and improve processing surface quality, but used working fluids are difficult to handle and are not environmentally friendly.

[0004] In order to improve the problems of low safety, environmental unfriendliness, and strong irritation to the human body of oil-based working fluids, relevant researchers have developed water-based working fluids represented by emulsions and deionized water. Emulsions are mainly made by mixing emulsified oil or emulsified soap with water. The microemulsion droplets are mainly water-in-oil, with low dielectric strength and electrolysis, which wastes electricity resources. Deionized water has the advantages of low cost, non-flammability, and environmental friendliness, but it has the disadvantages of large breakdown voltage drop, low processing efficiency, and easy rusting of machine tools. Summary of the invention

[0005] The purpose of the present invention is to provide a green and efficient electrospark machining working fluid, aiming to solve the problems of existing oil working fluids such as strong volatility, strong odor, low flash point, difficulty in handling, poor safety, strong irritation to the human body, and unfriendly to the environment, as well as the problems of low dielectric strength of water-based working fluids, electrolysis, energy waste, large breakdown voltage drop, low machining efficiency, and easy rusting of machine tools.

[0006] The principle of the present invention is: first, adding aluminum zinc phosphate rust inhibitor to deionized water according to the required proportion, stirring at a stirring speed of 800-1000r / min for 8-15 minutes at room temperature until it is completely dissolved and mixed evenly, so as to obtain the matrix solution A of the present invention, and aluminum zinc phosphate can effectively prevent the green and efficient electric spark machining machine from rusting during long-term use; then, adding sucrose to the above-mentioned matrix solution A according to the required proportion, stirring at a stirring speed of 800-1000r / min for 8-15 minutes at room temperature until it is completely dissolved and mixed evenly, so as to obtain the matrix solution A of the present invention. The matrix solution B prepared in this way is prepared. Adding sucrose can make the compressed air bubbles generated in the subsequent steps more stable. Then, the matrix solution B is mixed with compressed air through a venturi tube, and the inlet pressure of the matrix solution B is controlled within a limited range. The inlet pressure of the compressed air is controlled within a limited range to obtain a mixed working fluid C. The compressed air bubbles can effectively improve the dielectric constant of the working fluid, quickly discharge the etching products, and improve the discharge machining conditions. Finally, the mixed working fluid C is passed through an ultrasonic generator through a pipeline to refine the compressed air bubbles, and finally the green and efficient EDM working fluid to be prepared is obtained.

[0007] The upward-looking green and efficient EDM working fluid of the present invention has the advantages of low manufacturing cost, high dielectric strength, high safety factor, being green and pollution-free, being able to improve machining gap discharge conditions, effectively improving machining efficiency, and having good machining surface quality. DETAILED DESCRIPTION

[0008] The present invention is described in detail below with reference to specific embodiments, which are only used to explain the invention but not to limit the invention.

[0009] The specific preparation steps of the green and efficient EDM working fluid are as follows:

[0010] S1: adding aluminum zinc phosphate rust inhibitor to deionized water, the mass ratio of aluminum zinc phosphate rust inhibitor to deionized water is (3-6): (97-101), stirring the mixed solution at room temperature at a stirring speed of 800-1000 r / min for 8-15 minutes until it is completely dissolved and mixed uniformly, to obtain the matrix solution A of the present invention;

[0011] S2: adding sucrose to the matrix solution A, the mass ratio of sucrose to the matrix solution A being (1-3): (95-99), stirring the mixed solution at room temperature at a stirring speed of 800-1000 r / min for 8-15 minutes until the mixed solution is completely dissolved and uniformly mixed, to obtain the matrix solution B of the present invention;

[0012] S3: mixing the matrix solution B with compressed air through a venturi tube, controlling the inlet pressure of the matrix solution B within the range of 0.1 to 0.4 MPa, and controlling the inlet pressure of the compressed air within the range of 0.2 to 0.8 MPa, to obtain the mixed working solution C of the present invention;

[0013] S4: The semi-finished product is passed through an ultrasonic generator through a pipeline, the frequency is set to 20000-30000 Hz, the power density is set to 0.3-0.5w / cm2, the compressed air bubbles are refined, and finally the green and efficient EDM working fluid to be prepared is obtained.

Claims

1. A green and efficient electrospark machining working fluid, characterized by: The working solution is composed of aluminum zinc phosphate rust inhibitor, sucrose, compressed air and deionized water. When preparing the working solution, first, the aluminum zinc phosphate rust inhibitor is added to the deionized water, and the mass ratio of the aluminum zinc phosphate rust inhibitor to the deionized water is (3-6): (97-101), and the mixed solution is stirred at a stirring speed of 800-1000 r / min for 8-15 minutes at room temperature until the mixed solution is completely dissolved and mixed uniformly to obtain a matrix solution A; then, sucrose is added to the matrix solution A, and the mass ratio of sucrose to the matrix solution A is (1-3): (95-99), and the mixed solution is stirred at room temperature at a stirring speed of 800-1000 r / min for 8-15 minutes. The mixed solution is stirred at a stirring speed of 800 to 1000 r / min for 8 to 15 minutes until it is completely dissolved and mixed evenly to obtain a matrix solution B; then, the matrix solution B is mixed with compressed air through a venturi tube, the inlet pressure of the matrix solution B is controlled within the range of 0.1 to 0.4 MPa, and the inlet pressure of the compressed air is controlled within the range of 0.2 to 0.8 MPa to obtain a mixed working solution C; finally, the mixed working solution C is passed through an ultrasonic generator through a pipeline, and the frequency is set to 20 to 30 kHz and the power density is set to 0.3 to 0.5 w / cm 2 , and finally the desired green and efficient EDM working fluid is obtained.