Theoretical modeling and experimental study of rock-breaking depth in particle jet impact drilling process

2019 ◽  
Vol 183 ◽  
pp. 106419 ◽  
Author(s):  
Fushen Ren ◽  
Tiancheng Fang ◽  
Xiaoze Cheng
Keyword(s):  
Experimental Study ◽  
Rock Breaking ◽  
Theoretical Modeling ◽  
Drilling Process ◽  
Jet Impact

An Experimental Study of the Abrasive Water Jet Micro-Machining Process for Quartz Crystals

2012 ◽  
Vol 565 ◽  
pp. 339-344 ◽  
Author(s):  
H. Qi ◽  
J.M. Fan ◽  
Jun Wang
Keyword(s):  
Experimental Study ◽  
Removal Rate ◽  
Water Jet ◽  
Machining Process ◽  
Bottom Surface ◽  
Micro Machining ◽  
Abrasive Water Jet ◽  
Process Variables ◽  
Jet Impact ◽  
Micro Channels

An experimental study of the machining process for micro-channels on a brittle quartz crystal material by an abrasive slurry jet (ASJ) is presented. A statistical experiment design considering the major process variables is conducted, and the machined surface morphology and channelling performance are analysed to understand the micro-machining process. It is found that a good channel top edge appearance and bottom surface quality without wavy patterns can be achieved by employing relatively small particles at shallow jet impact angles. The major channel performance measures, i.e. material removal rate (MRR) and channel depth, are then discussed with respect to the process parameters. It shows that with a proper control of the process variables, the abrasive water jet (AWJ) technology can be used for the micro-machining of brittle materials with high quality and productivity.

Experimental Study on Bit Tooth Made of Nano-Cemented Carbide Composites in Air Hammer Drilling

2011 ◽  
Vol 233-235 ◽  
pp. 2955-2961
Author(s):  
Zhi Qiang Huang ◽  
Qin Li ◽  
Wei Li ◽  
Yi Zhou ◽  
Shi Jin Peng ◽  
...  
Keyword(s):  
Experimental Study ◽  
Wear Resistance ◽  
Rock Breaking ◽  
Cemented Carbide ◽  
Nano Composites ◽  
Transgranular Fracture ◽  
New Thought ◽  
Air Hammer ◽  
Comprehensive Performance ◽  
Site Test

It is fracture, wear and abscission of bit tooth that make up of the main failure forms for the air hammer bit, which have badly restricted the further popularization and application of the air hammer drilling. The main reason is that the ordinary cemented carbide tooth is difficult to meet the complex conditions of the air the hammer drilling. Therefore, this research puts forward a new thought that we strengthen the carbide tooth by adding the nano-Al2O3into the substrate materials of WC-Co. According to the study of several formulas of nano-composites, the test of sample performance, experimental study of impact abrasive wear and microstructure, we draw some conclusions that adding amount of nano-Al2O3can refine grain, make microstructure more uniform and improve the wear resistance of composites, but also can enhance the strength of boundaries of WC-Co and transform the fracture form from the intergranular fracture to the transgranular fracture. Meanwhile, it can also improve nano-composites comprehensive performance by adding rare earth. The result for site test of bit shows that comparing with the bit equipped the original carbide teeth, the efficiency of rock breaking of the bit equipped nano-composites teeth increase by 20% and the service life increase by 80%.

Theoretical modeling and experimental study of dielectric loss of the multi-push-pull mode magnetoelectric laminate composites

2018 ◽  
Vol 5 (2) ◽  
pp. 026105
Author(s):  
Bingbing Xu ◽  
Jiashuai Ma ◽  
Cong Fang ◽  
Meng Yao ◽  
Wenning Di ◽  
...  
Keyword(s):  
Experimental Study ◽  
Dielectric Loss ◽  
Theoretical Modeling ◽  
Laminate Composites
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