A Micro-Deposition Method by Using EDM

2007 ◽  
Vol 339 ◽  
pp. 32-36 ◽  
Author(s):  
Bai Dong Jin ◽  
Guo Hui Cao ◽  
Zhen Long Wang ◽  
Wan Sheng Zhao
Keyword(s):  
Electrode Material ◽  
High Speed ◽  
Steel Surface ◽  
High Speed Steel ◽  
Processing Parameters ◽  
Tool Electrode ◽  
Micro Edm ◽  
Deposition Method ◽  
Basic Principles ◽  
And Tungsten

A new micro EDM method is described. First, the basic principles of micro EDD are analyzed and realized conditions are predicted. Then with an ordinary EDM shaping machine and electrode brass, steel and tungsten, a large number of experiments are carried out in air to obtain the effects of different processing parameters on micro EDD. A micro cylinder with 0.19mm in diameter and 7.35mm in height is formed on high-speed steel surface. By exchanging the polarities of electrode and workpiece the deposited material can be removed selectively, thus the reversible machining is realized. In the end, measurements show that the deposited material is compact and hardened, whose components depend on the tool electrode material although Zn in brass electrode is oxidized to ZnO.

Micro-Forming Process and Microstructure of Deposit by Using Micro EDM Deposition in Air

2008 ◽  
Vol 375-376 ◽  
pp. 153-157 ◽  
Author(s):  
Zi Long Peng ◽  
Zhen Long Wang ◽  
Bai Dong Jin
Keyword(s):  
High Speed ◽  
Pulse Generator ◽  
Electrical Discharge Machining ◽  
High Speed Steel ◽  
Solidification Process ◽  
Pulse Interval ◽  
Tool Electrode ◽  
Micro Edm ◽  
Forming Process ◽  
Long Pulse

Based on analysis of the mechanism of Electrical Discharge Machining (EDM) and the characteristics of deposition processing, the processing conditions of micro EDM Deposition (micro EDD) are determined. Micro EDD is a new EDM method taking air as machining medium, using narrow pulse width, long pulse interval, low discharge current and connecting the tool electrode with the anode of pulse generator. Using EDM shaping machine and brass, tungsten and steel as tool electrode respectively, micro cylinders are deposited on high-speed steel surface. And then the microstructure of deposit is analyzed detailedly. Results show that elements of the deposited material distribute uniformly, whose components depend on the tool electrode material. As the high cooling rate of the solidification process, the deposit grain size refines obviously, which leads to the hardness of tungsten or steel deposit increasing. Moreover, the Metallurgical bonding has occurred on the interface between deposit and high-speed steel base, whose thickness is about 5μm.

Technique of Brass Spiral Structure Deposition Using Micro EDM in Gas

2007 ◽  
Vol 329 ◽  
pp. 595-600
Author(s):  
Zhen Long Wang ◽  
Bai Dong Jin ◽  
Guo Hui Cao ◽  
Z.W. Wei ◽  
Wan Sheng Zhao
Keyword(s):  
Electrical Discharge ◽  
High Speed ◽  
Spiral Structure ◽  
Electrical Discharge Machining ◽  
Three Dimensional ◽  
High Speed Steel ◽  
Processing Parameters ◽  
Pulse Interval ◽  
Tool Electrode ◽  
External Diameter

This paper proposes a new deposition method using micro electrical discharge machining (EDM) to deposit micro spiral structure in gas. First, the basic principles of micro electrical discharge deposition (EDD) are analyzed and the realized conditions are predicted. Then with an ordinary EDM shaping machine, brass as the electrode, high-speed steel as the workpiece, a lot of experiments are carried out on the micro spiral structure deposition in air. The effects of major processing parameters, such as the discharge current, discharge duration, pulse interval, gravity and working medium, are obtained. As a result, a 19-circle micro spiral structure with 0.19mm in external diameter, 0.1mm in wire diameter and 3.39mm in height is deposited. Measurements show that the deposited material has obvious delaminating structure, the components of which depend on those of the tool electrode material, although Zn in the electrode is oxidized to ZnO. This method establishes the research basis for micro three-dimensional deposition machining.

Fabrication of Micro Structure Using EDM Deposition

2006 ◽  
Vol 532-533 ◽  
pp. 305-308
Author(s):  
Bai Dong Jin ◽  
Wan Sheng Zhao ◽  
Guo Hui Cao ◽  
Zhen Long Wang ◽  
Kai Xiao
Keyword(s):  
Electrode Material ◽  
High Speed ◽  
Spiral Structure ◽  
Three Dimensional ◽  
High Speed Steel ◽  
Tool Electrode ◽  
External Diameter ◽  
Micro Structure ◽  
Tungsten Electrodes ◽  
Continuous Deposition

A new deposition method is described using EDM to deposit tool electrode material on workpiece in air. Then by exchanging the polarities the deposited material can be removed selectively, thus micro structure can be fabricated. First, the EDD realized conditions are predicted. Then with ordinary brass, steel and tungsten electrodes and high-speed steel workpiece, EDD experiments are carried out to obtain micro structure in air. With continuous deposition strategy of single cylinder, a HIT character type array made up of 15 micro cylinders is deposited. And micro three-dimensional spiral structure can be obtained with brass electrode using feed of only z axis. The 19-circle micro spiral structure is 0.19mm in external diameter, 0.1mm in wire diameter and 3.39mm in height. Measurements show that deposited material has obvious delaminating structure and is corrosion resistant, whose components depend on those of the tool electrode material.

Surface Modification of High-Speed Steel by Plasma Nitriding

2014 ◽  
Vol 709 ◽  
pp. 403-409 ◽  
Author(s):  
Bauyrzhan K. Rakhadilov ◽  
Mazhyn Skakov ◽  
Erlan Batyrbekov ◽  
Michael Scheffler
Keyword(s):  
Surface Layer ◽  
Phase Composition ◽  
Diffusion Layer ◽  
High Speed ◽  
Steel Surface ◽  
Plasma Nitriding ◽  
High Speed Steel ◽  
R6m5 Steel ◽  
Modified Layer ◽  
Surface Modified

The article investigates the changing in the structure and phase composition of the R6M5 high-speed steel surface layer after electrolytic-plasma nitriding. It is found that after electrolytic-plasma nitriding on the R6M5 steel surface, modified layer is formed, which consist from a diffusion layer. It was showed phase composition of difysion layer is changing depending on the nitriding. It is found that electrolytic-plasma nitriding lead to accelerated formation of the modified layer. It is determined that after electrolytic-plasma nitriding on the high-speed steel surface, modified layer is formed, consisting only of the diffusion layer.

Wear-Resistance of Nitrided W-Mo-High Speed Steel in Abrasive Wear Conditions

2013 ◽  
Vol 594-595 ◽  
pp. 1117-1121
Author(s):  
Мazhyn Skakov ◽  
Bauyrzhan Rakhadilov ◽  
Merey Rakhadilov
Keyword(s):  
Wear Resistance ◽  
Surface Layer ◽  
Abrasive Wear ◽  
High Speed ◽  
Steel Surface ◽  
Plasma Nitriding ◽  
Cutting Tools ◽  
High Speed Steel ◽  
Abrasive Wear Resistance ◽  
R6m5 Steel

In this work the influence of electrolytic-plasma nitriding on the abrasive wear-resistance of R6M5 high-speed steel were under research. We registered that after electrolytic-plasma nitriding on R6M5 steel surface modified layer is formed with 20-40 μm thickness and with increased microhardness of 9000-12200 MPa. Testing mode for the nitrided samples high-speed steel on abrasive wear developed. It is established, that electrolyte-plasma nitriding allows to increase wear-resistance of R6M5 steel surface layer comparing to original. It was determined that abrasive wear-resistance of R6M5 steel surface layer is increased to 25% as a result of electrolytic plasma nitriding. Thus, studies have demonstrated the feasibility and applicability of electrolytic-plasma nitriding in order to improve cutting tools work resource, working under friction and wear conditions.

Friction Reducing Mechanism of High Speed Steel Surface with Ni-Based WC Stripes by Laser Cladding

2018 ◽  
Vol 55 (2) ◽  
pp. 021403
Author(s):  
王燕琳 Wang Yanlin ◽  
何源 He Yuan ◽  
洪鑫 Hong Xing ◽  
陈斌 Chen Bin ◽  
于爱兵 Yu Aibing
Keyword(s):  
Laser Cladding ◽  
High Speed ◽  
Steel Surface ◽  
High Speed Steel ◽  
Friction Reducing

Optimisation of Processing Parameters for Direct Vacuum Sintering of a T15 High Speed Steel

1991 ◽  
Vol 34 (2) ◽  
pp. 93-100 ◽  
Author(s):  
M. Santos ◽  
M. M Oliveira ◽  
M. M Rebbeck ◽  
A. S. Wronski
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Processing Parameters ◽  
Vacuum Sintering
Sign in / Sign up

Export Citation Format

Share Document