The experimental research on electrodischarge drilling of high aspect ratio holes in Inconel 718

Lipiec, Piotr; Machno, Magdalena; Skoczypiec, Sebastian

doi:10.1063/1.5034949

Cited by 5 publications

(6 citation statements)

References 13 publications

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“…An especially high concentration of eroded particles occurs in the corner of the drilled hole [16]. These phenomena lead to high process instability, defects on the internal surface of the holes, holes with poor shape accuracy (in terms of hole taper and hole dilation), excessive tool wear (at the side and the end), and a low machining speed [12,13,14,17,18,19]. In the deep hole drilling process, a high-pressure pump for dielectric flushing (up to 25 MPa) and tube electrodes with inner flushing are used [20].…”

Section: Introductionmentioning

confidence: 99%

Impact of Process Parameters on the Quality of Deep Holes Drilled in Inconel 718 Using EDD

Machno

2019

Materials

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Advanced engineering materials (e.g., nickel or titanium alloy) are being increasingly applied to produce parts of gas turbines in the aerospace industry. To improve the durability of these parts, many holes, with a length-to-diameter aspect ratio greater than 20:1, are created in their structure. The quality of the holes significantly affects the cooling process of the elements. However, it is challenging to machine materials by conventional methods. When machining a hole with a high aspect ratio, the major problem is effective flushing of the machining area, which can improve the hole’s surface integrity and dimensional accuracy. Consequently, the electro-discharge drilling (EDD) process is good alternative for this application. This paper presents the results of an analysis of the EDD of Inconel 718 alloy. An experiment was conducted to evaluate the impact of process parameters (pulse time, current amplitude, and discharge voltage) on the process’s performance (linear tool wear, taper angle, drilling speed, the hole’s aspect ratio, and surface roughness (Ra and Rz)). The results show that EDD provides us with the possibility to drill holes with an aspect ratio greater than 10:1. The results also demonstrate that holes with an aspect ratio greater than 10:1 and a small taper angle value have a significantly decreased quality of internal surface, especially at the bottom of the hole. This indicates that an insufficient amount of debris is removed from the bottom of the hole.

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Section: Introductionmentioning

confidence: 99%

Impact of Process Parameters on the Quality of Deep Holes Drilled in Inconel 718 Using EDD

Machno

2019

Materials

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“…This wouldn't work well on earth because of wind and rain but it should be feasible on the moon if the metamaterial can be made. A recent article (Lipiec et al [67]) describes advantages and disadvantages of EDM in drilling. Perhaps the metamaterial approach can shift the balance favorably.…”

Section: Mechanical Engineering For Transport Networkmentioning

confidence: 99%

Lunaport: Math, Mechanics & Transport

Kainen¹

2021

Preprint

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“…Among the materials for which the EDM process is used, there are innovative engineering materials, such as nickel-chromium superalloys, titanium alloys, permanently hardened, very hard materials [1][2][3]. Strength and thermal parameters of such alloys or superalloys allow for their use for parts in aviation and automotive industries [4,5]. Furthermore, many parts in these industries require micro-scale geometries, for example, the manufacturing technology of turbine blades in aviation.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Channel and Gap Flow Simulation For Electrical Discharge Micro-Drilling of Inconel 718 Superalloy

Machno,

Trajer,

Czeszkiewicz

et al. 2024

Adv. Sci. Technol. Res. J.

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The process of electrical discharge micro-drilling (micro-EDD) of micro holes is used in the aviation, automotive and biomedical industries. In this process, an important issue affecting the stability and efficiency of the process is the flow of the working fluid through the tool electrode channel and the front and side gap areas. Because tool electrodes have diameters below 1 mm. Many factors present in the EDM-drillig process occurring on a micro scale mean that a full explanation of the phenomena affecting the process is limited. The solution is to analyze the phenomena in the process based on the results of numerical simulations, which are based on real measurements. The aim of this work is to analyze the flow of de-ionized water through a brass single-channel electrode with a channel diameter of 0.11 mm and a front and side gap. The liquid flow was analyzed for various variants (with and without cavitation, with added rotation of the tool electrode, with and without surface roughness with material particles). In simulation, it is important to gradually increase the complexity of the model, starting with the simplest model and gradually adding further phenomena. Analysis of the simulation results showed a significant impact on the liquid flow of cavitation, as well as the presence of vortex gaps in some areas, which have a significant impact on the process of drilling micro holes.

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The experimental research on electrodischarge drilling of high aspect ratio holes in Inconel 718

Cited by 5 publications

References 13 publications

Impact of Process Parameters on the Quality of Deep Holes Drilled in Inconel 718 Using EDD

Impact of Process Parameters on the Quality of Deep Holes Drilled in Inconel 718 Using EDD

Lunaport: Math, Mechanics & Transport

A Study on the Channel and Gap Flow Simulation For Electrical Discharge Micro-Drilling of Inconel 718 Superalloy

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