Vibration Assisted Deep Hole Micro-Drilling: a Preliminary Experimental Study

Recently, the trends of industrial products move towards more miniaturization, variety and mass production. Micro drilling which take high precision in cutting work is required to perform more micro hole and high speed working. Especially, Micro deep hole drilling is becoming more important in a wide spectrum of precision production industries, ranging from the production of automotive fuel injection nozzle, watch and camera parts, medical needles, and thick multilayered Printed Circuit Boards(PCB) that are demanded for very high density electric circuitry. The industries of precision production require smaller holes, high aspect ratio and high speed working for micro deep hole drilling. However the undesirable characteristics of micro drilling is the small signal to noise ratios, wandering motion of drill, high aspect ratio and the increase of cutting force as cutting depth increases. In order to optimize cutting conditions, an experimental study on the characteristics of micro deep hole machining processes using a tool dynamometer was carried out. And additionally, microscope with built-in an inspection monitor showed the relationship between burr in workpieces and chip form of micro drill machining.

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Experimental Study on PCB Micro Drilling Force

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.246-247.1017 ◽

2012 ◽

Vol 246-247 ◽

pp. 1017-1021 ◽

Cited By ~ 1

Author(s):

Feng Gong ◽

Bai Qiang Chen ◽

Ji Bin Li

Keyword(s):

Experimental Study ◽

Cutting Force ◽

Printed Circuit Board ◽

Circuit Board ◽

Drilling Machine ◽

Drilling Force ◽

Printed Circuit ◽

Market Competitiveness ◽

Pcb Design ◽

Micro Drilling

With the development of high density, multi-functions, miniaturization and multi-layer on printed circuit board (PCB) design, great challenges have been presented to the miniaturization of drilling on PCB. In order to meet the hole precision, quality and improve the performance, efficiency of mechanical drilling, further research should be done on the cutting state. Kistler high-precision micro-force platform was used in this paper to test and analyze the cutting force, investigate the general laws of micro drilling, and optimize the parameters for HANS PCB drilling machine. Thereby, to improve the efficiency and precision of the drilling, range of processing, and increasing market competitiveness.

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Theoretical and experimental study on rifling mark generating phenomena in BTA deep hole drilling process (generating mechanism and countermeasure)

International Journal of Machine Tools and Manufacture ◽

10.1016/j.ijmachtools.2014.10.003 ◽

2015 ◽

Vol 88 ◽

pp. 194-205 ◽

Cited By ~ 17

Author(s):

Kenichiro Matsuzaki ◽

Takahiro Ryu ◽

Atsuo Sueoka ◽

Keizo Tsukamoto

Keyword(s):

Experimental Study ◽

Hole Drilling ◽

Drilling Process ◽

Deep Hole ◽

Deep Hole Drilling

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Experimental Study of Gangue Layer Weakening with Deep-Hole Presplitting Blasting

Shock and Vibration ◽

10.1155/2021/4796500 ◽

2021 ◽

Vol 2021 ◽

pp. 1-11

Author(s):

Jianchi Hao ◽

Lifeng Ren ◽

Hu Wen ◽

Duo Zhang

Keyword(s):

Experimental Study ◽

Coal Seam ◽

Coal Mining ◽

Hard Rock ◽

Blast Hole ◽

Normal Operation ◽

Deep Hole ◽

Coal Seams ◽

Layer 4 ◽

Similar Simulation

Advances in coal mining technology and an increase in coal output are resulting in increasingly challenging conditions being encountered at coal seams. This is particularly so at thin coal seams, where a large number of hard rock layers known as gangue are often present, which seriously affect the normal operation of the shearer and reduce coal output. Therefore, the effective weakening of hard gangue layers in a coal seam is crucial to ensure that the shearer operates effectively and that coal output is maximized. In this paper, the weakening effect of deep-hole presplitting blasting technology on the hard gangue layer in a coal seam is studied via a similar simulation. Four test schemes are designed: (1) A blasting hole spacing of 200 mm with the holes offset vertically. (2) A blast hole spacing of 300 mm with the holes offset vertically. (3) A blast hole spacing of 200 mm with the holes parallel to the gangue layer. (4) A blasting hole spacing of 200 mm with the holes offset vertically and initiation of interval blasting. The effect of the different blasting hole spacings and arrangements and different detonation methods on the weakening of coal seam clamping by gangue is studied, and the best configuration is identified. This improves the effect of weakening the coal gangue layer by deep-hole presplitting blasting.

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