scholarly journals Simulation and Experimental Investigation on Micro Electrochemical Drilling of Deep Micro-Holes by using High-speed Spiral Electrode

2018 ◽  
Keyword(s):  
Experimental Investigation ◽  
High Speed ◽  
Electrochemical Drilling ◽  
Micro Holes

scholarly journals Fabrication of Taper Free Micro-Holes Utilizing a Combined Rotating Helical Electrode and Short Voltage Pulse by ECM

Micromachines ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 28 ◽  
Author(s):  
Yong Liu ◽  
Minghong Li ◽  
Jingran Niu ◽  
Shizhou Lu ◽  
Yong Jiang
Keyword(s):  
Voltage Pulse ◽  
High Speed ◽  
Manufacturing Industry ◽  
Difficult Problem ◽  
Machining Accuracy ◽  
Gap Flow ◽  
Electrochemical Drilling ◽  
Micro Holes ◽  
Micro Hole ◽  
Helical Electrode

Fabrication of the injection nozzle micro-hole on the aero engine is a difficult problem in today’s manufacturing industry. In addition to the size requirements, the nozzle micro-hole also requires no burr, no taper and no heat-affected zone. To solve the above problem, an ultra-short voltage pulse and a high-speed rotating helical electrode were used in electrochemical drilling (ECD) process. Firstly, a theoretical model of ECD with ultra-short voltage pulse was established to investigate the effects of many predominant parameters on machining accuracy, and the effect of rotating helical electrode on the gap flow field was analyzed. Secondly, sets of experiments were carried out to investigate the effects of many key parameters on machining accuracy and efficiency. Finally, the optimized parameters were applied to machine micro holes on 500 μm thickness of GH4169 plate, and micro-holes with the diameter of 186 μm with no taper were machined at the feed rate of 1.2 μm/s. It is proved that the proposed ECD process for fabricating micro-holes with no taper has a huge potential and broad application prospects.

Experimental Study on Electrochemical Drilling of Micro Holes with High Aspect Ratio

2014 ◽  
Vol 941-944 ◽  
pp. 1952-1955 ◽  
Author(s):  
Yong Liu ◽  
Shao Fu Huang
Keyword(s):  
Aspect Ratio ◽  
High Speed ◽  
Electrochemical Machining ◽  
Difficult Problem ◽  
Drilling Process ◽  
Electrochemical Drilling ◽  
Drilling Technology ◽  
Micro Holes ◽  
Machining System ◽  
Rotary Speed

It is a difficult problem to fabricate deep and micro holes on the difficult-to-cut metals in the field of aviation manufacturing. The experimental research of electrochemical drilling technology with high-speed micro electrode for fabricating deep micro holes is carried out. The influences of rotary speed on machining precision and stability are studied. The holes, which the diameter is about 400μm, the aspect ratio is more than 10, and have steep wall and sharp edges were fabricated successfully on the nickelbase superalloys on self-developed high-precision micro-electrochemical machining system. It is proved that the high-speed electrochemical drilling process for fabricating deep and micro holes has a huge potential and broad application prospects.

EXPERIMENTAL INVESTIGATION OF THE INFLUENCE OF VORTEX GENERATORS AND LIQUID INJECTION ON NOISE IN HIGH-SPEED JETS

2012 ◽  
Vol 43 (4) ◽  
pp. 481-496 ◽  
Author(s):  
Valeriy Ivanovich Zapryagaev ◽  
Nikolay Petrovich Kiselev ◽  
Dmitriy Andreevich Gubanov
Keyword(s):  
Experimental Investigation ◽  
High Speed ◽  
Vortex Generators ◽  
Liquid Injection

Experimental Investigation on Cavitation Characteristics of a Three-Groove Journal Bearing

2013 ◽  
Vol 420 ◽  
pp. 47-50
Author(s):  
Ying Yang ◽  
Jing Hua Dai
Keyword(s):  
Experimental Investigation ◽  
High Speed ◽  
Journal Bearing ◽  
Rupture Zone ◽  
Work Characteristics ◽  
Oil Film ◽  
Rotating Speed ◽  
Clear Effect ◽  
Supply Pressure

Under high and super-high speed, oil film of the journal bearing is easy to crack and then becomes cavitation. The existence of cavitation has an important effect on the work characteristics of the shaft. On the journal bearing experiment rig the cavitation characteristics of the three-groove journal beaing were studied. The influences of the shaft rotating speed and supply pressure on cavitation shape were investigated. The results show that rotating speed and supply pressure have a clear effect on the cavitation shape, and the number of cavitation strip in the rupture zone decreases when the supply pressure increases.

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