Study on the Strategies for Fabrication of Die Assembly with Typical Shaped Cavity by Using Electrical Discharge Machining

2012 ◽  
Vol 192 ◽  
pp. 118-122
Author(s):  
Ren Yu Feng ◽  
Min Wang ◽  
Zhi Jian Duan
Keyword(s):  
Service Life ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Thermal Characteristics ◽  
Suitable Method ◽  
Metallic Materials ◽  
Material Hardness ◽  
The Cost ◽  
Machining Strategies ◽  
Edm Process

Die assembly is a kind of special tools for fabrication of metal or non-metallic materials parts with required design and purpose. Generally, the high material hardness for die assembly should be selected to increase the service life and reduce the cost in manufactory industry. Electrical discharge machining (EDM) is a suitable method for fabrication of die assembly as the material remove in EDM process mainly depends on the material's thermal characteristics, regardless of the hardness. In this paper, the machining strategies for fabrication of die assembly with typical shaped cavity using EDM were discussed, according to the different cavity structures, the best machining strategies were proposed

Monitoring System for the Micro EDM Process

2012 ◽  
Author(s):  
Jayakumar Narasimhan ◽  
Kamlakar P. Rajurkar
Keyword(s):  
Electrical Discharge ◽  
Lead Time ◽  
Material Removal ◽  
Online Monitoring ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Micro Edm ◽  
Current Signal ◽  
The Cost ◽  
Edm Process

Now-a-days, many sophisticated systems are available to monitor the process in real time that drastically reduce the cost and lead time to manufacture a part because it takes away the offline sampling. For Electrical Discharge Machining (EDM), current signal monitors are very useful to predict the material removal rate and determine the arcing that can damage the surface. This paper discusses the design and development of an online monitoring for micro-EDM using correlation developed via experimentation. Surface roughness is predicted based on online monitoring.

Investigation of the Spark Cycle Effect on Material Removal Rate in Wire Electrical Discharge Machining

Manufacturing ◽  
2003 ◽  
Author(s):  
Scott F. Miller ◽  
Albert J. Shih
Keyword(s):  
Process Parameters ◽  
Material Removal Rate ◽  
Electrical Discharge ◽  
Material Removal ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Short Circuit ◽  
Wire Electrical Discharge Machining ◽  
Time Duration ◽  
Edm Process

The development of new, advanced engineering materials and the needs for precise and flexible prototype and low-volume production have made wire electrical discharge machining (EDM) an important manufacturing process to meet such demand. This research investigates the effect of spark on-time duration and spark on-time ratio, two important EDM process parameters, on the material removal rate (MRR) and surface integrity of four types of advanced material: porous metal foams, metal bond diamond grinding wheels, sintered Nd-Fe-B magnets, and carbon-carbon bipolar plates. An experimental procedure was developed. During the wire EDM, five types of constraints on the MRR due to short circuit, wire breakage, machine slide speed limit, and spark on-time upper and lower limits have been identified. An envelope of feasible EDM process parameters is created and compared across different work-materials. Applications of such process envelope to select process parameters for maximum MRR and for machining of micro features are presented.

Relationship between the Fine Discharge Parameters and Craters EDMed of the NAK80 Steel

2010 ◽  
Vol 426-427 ◽  
pp. 85-88
Author(s):  
Hong Jun Wang ◽  
Dun Wen Zuo ◽  
X.M. Wu ◽  
M. Wang
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Discharge Voltage ◽  
Optimization Scheme ◽  
Crater Diameter ◽  
Open Discharge ◽  
Discharge Parameters ◽  
Pulse Off Time ◽  
Off Time ◽  
Edm Process

The crater diameter and depth of the surface machined by electrical discharge machining (EDM) were used to evaluate indexes for EDMed surface. The influence of discharge parameters selected on the crater diameter and depth in mirror-like surface EDM process was investigated, and the optimization scheme was obtained. An L16 (44×23) Taguchi standard orthogonal array was chosen for the design of experiments. Experimental results indicate that peak current and open discharge voltage have more influence on the crater diameter and depth in comparison with pulse off-time and pulse duration. Also the results confirm that the crater depth is about 10 to 20 percent of its diameter while the near-mirror EDM conducted in the NAK80 steel with fine discharge parameters.

The Effect of the Electrical Discharge Machining Process on the Material Properties of Nonconductive Ceramics

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Nirdesh Ojha ◽  
Florian Zeller ◽  
Claas Mueller ◽  
Holger Reinecke
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Flexural Strength ◽  
Vickers Hardness ◽  
Electrical Discharge ◽  
High Performance ◽  
Electrical Discharge Machining ◽  
Machining Process ◽  
Hardness Increase ◽  
Edm Process

Electrical discharge machining (EDM) is widely used to manufacture complex shaped dies, molds and critical parts in conductive materials. With the help of an assisting electrode (AE), EDM process can be used to machine nonconductive ceramics. This paper evaluates the mechanical properties of three high-performance nonconductive ceramics (ZrO2, Si3N4, and SiC) that have been machined with the EDM process using AE. Mechanical properties such as Vickers hardness (HV 0.3), surface roughness (Sq), and flexural strength of the machined and the nonmachined samples are compared. The EDM process causes decrease in Vickers hardness, increase in surface roughness, and decrease in flexural strength.

Machining Characteristics of IN718 by EDM with Cooled Electrode and Vibration of the Workpiece

2020 ◽  
Vol 996 ◽  
pp. 131-136
Author(s):  
Yao Li ◽  
Cheng Cui ◽  
Bengang Lin ◽  
Li Li
Keyword(s):  
Electrical Discharge ◽  
Material Removal ◽  
Electrical Discharge Machining ◽  
Cryogenic Cooling ◽  
Tool Electrode ◽  
Machining Efficiency ◽  
Electrical Erosion ◽  
Machining Characteristics ◽  
Edm Process ◽  
Process Material

Inconel718 has been widely used in various fields for its good performance, but it is difficult to machine with traditional machining methods. Electrical discharge machining is an alternative competitive process to machine Nickel-based alloys by electrical erosion. In order to improve reduce the electrode loss and improve the machining efficiency, the horizontal ultrasonic vibration of the workpiece and the cryogenic cooling of the tool electrode were applied into the EDM process. Material removal efficiency, surface roughness, surface topography, and microhardness have been characterized.

scholarly journals Study on the Influence of Metallic Powder in Near-Dry Electric Discharge Machining

2020 ◽  
Vol 66 (4) ◽  
pp. 243-253 ◽  
Author(s):  
Sanjay Sundriyal ◽  
Vipin ◽  
Ravinderjit Singh Walia
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Dielectric Medium ◽  
Metallic Powder ◽  
Machining Process ◽  
Electric Discharge Machining ◽  
En 31 ◽  
Edm Process ◽  
Dry Electrical Discharge Machining

Near-dry electrical discharge machining (ND-EDM) is an eco-friendly process. In this study, an approach has been made to make the machining process more efficient than ND-EDM with the addition of metallic powder with the dielectric medium to machine EN-31 die steel. Powdermixed near-dry EDM (PMND-EDM) has several advantages over the ND-EDM or conventional electrical discharge machining (EDM) process, such as a higher material removal rate (MRR), fine surface finish (Ra), sharp cutting edge, lesser recast layer, and lower deposition of debris. The output response variables are MRR, Ra, residual stress (RS) and micro-hardness (MH) of the machined surfaces. Further study of the workpiece was performed, and a comparative study was conducted between ND-EDM and PMND-EDM. In this proposed method of machining, the MRR, Ra, and MH increased by 17.85 %, 16.36 %, and 62.69 % while RS was reduced by 56.09 %.

Dentale Implantatstrukturen aus CrCoMo/Near-dry EDM of CrCoMo dental implant structures

2020 ◽  
Vol 110 (11-12) ◽  
pp. 811-815
Author(s):  
Lisa Marie Rickerts ◽  
Tassilo-Maria Schimmelpfennig ◽  
Ivan Perfilov
Keyword(s):  
Dental Implant ◽  
High Precision ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Tool Electrode ◽  
Process Variables ◽  
Dry Edm ◽  
Edm Process ◽  
Erosion Zone

Die Funkenerosion wird in der Dentalindustrie zur Herstellung von hochpräzisem Zahnersatz aus CrCoMo eingesetzt. Dieser Beitrag stellt die Strategie und Technologie der halbtrockenen Funkenerosion von CrCoMo-Dentalbrücken vor. Als Dielektrikum kommt ein Wasser-Luft-Gemisch zum Einsatz, dass durch ein speziell entwickeltes Spülsystem durch die Kupfer-Werkzeugelektrode in die Erodierzone injiziert wird. Um die Effizienz des halbtrockenen Erodierprozesses zu erhöhen, werden die grundlegenden Zusammenhänge zwischen ausgewählten Prozessgrößen experimentell untersucht. Electrical discharge machining (EDM) is used in dental industry for the manufacturing of high-precision dentures from CrCoMo. This article presents the strategy and technology of near-dry EDM of CrCoMo dental bridges. A water-air mixture, which is injected through the copper tool electrode into the erosion zone by a specially developed flushing system is used as dielectric. In order to increase the efficiency of the near-dry EDM process, the basic relationships between the influencing process variables are investigated experimentally.

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