In-process monitoring technique during CO2 laser via-hole drilling of printed wiring boards

1999 ◽  
Author(s):  
Isamu Miyamoto ◽  
Takayuki Nakayama
Keyword(s):  
Process Monitoring ◽  
Co2 Laser ◽  
Hole Drilling ◽  
Printed Wiring Boards ◽  
Monitoring Technique ◽  
Via Hole

scholarly journals Highly Reliable CO2 Laser VIA Hole Drilling Technology by In-site Process Monitoring

2012 ◽  
Vol 15 (1) ◽  
pp. 59-65 ◽  
Author(s):  
Ken-ichiro Tanaka ◽  
Masao Kubo ◽  
Yuichi Uchida ◽  
Isamu Miyamoto
Keyword(s):  
Process Monitoring ◽  
Co2 Laser ◽  
Hole Drilling ◽  
Drilling Technology ◽  
Via Hole

Cu-Direct Via-Hole Drilling of Aramid Fiber Reinforced Build-Up Layer by CO2 Laser Beam

2005 ◽  
Author(s):  
Eiichi Aoyama ◽  
Toshiki Hirogaki ◽  
Keiji Ogawa ◽  
Nobuyuki Doi ◽  
Ryu Minagi
Keyword(s):  
Co2 Laser ◽  
Copper Foil ◽  
Effective Means ◽  
Hole Diameter ◽  
Hole Drilling ◽  
Printed Wiring Boards ◽  
Laser Absorption ◽  
Direct Laser ◽  
Via Hole ◽  
The Difference

This report describes the features of Cu-direct laser drilled hole quality on multi-layer Printed Wiring Boards (PWBs). Cu-direct laser drilling drills the outer copper foil and build-up layer at the same time, which makes it difficult to form a blind via hole (BVH) with high quality because the copper foil has high reflection coefficient for a CO2 laser with wavelength 10.6 μm. Therefore, this study focused on improving drilled hole qualities such as diameter and overhang. First, the influence of laser irradiation conditions on forming BVH and the drilled hole diameter were investigated in detail. Second, a new method employing thermography was proposed in order to evaluate the absorption of copper foil after surface treatment. Third, the effect of mixing fillers into the build-up layer in order to reduce the amount of overhang was shown to be effective both experimentally and theoretically. As a result, it is clear that decreasing the difference in the laser absorption rate of the outer copper foil is an effective means to control the hole diameter and reducing the heat characteristic difference between the outer copper foil and the build-up layer can effectively decrease overhang.

Optimization of Feed Speed and Stroke for Step Micro Hole Drilling of Printed Wiring Boards by Response Surface Method

2012 ◽  
Vol 523-524 ◽  
pp. 509-514 ◽  
Author(s):  
Naoya Noguchi ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Keiji Ogawa ◽  
Yutaka Takeda
Keyword(s):  
Response Surface ◽  
Response Surface Method ◽  
High Speed ◽  
Hole Drilling ◽  
Feed Speed ◽  
Printed Wiring Boards ◽  
Step Cycle ◽  
Stroke Length ◽  
Surface Method ◽  
Micro Drilling

There have been few reports dealing with the drilling of printed wiring boards (PWBs) with micro-drills that are smaller than 0.2 mm in diameter, and super-high-speed spindles that are higher than 160,000 rpm. In these cases, preventing the micro-drill from breaking and keeping the position accuracy of the drilled hole has been difficult. We therefore focus on the high-speed step-drilling method and short stroke as a novel way of resolving these problems. On the other hand, determining the complicated combination of feed speed, rapid feed speed, and stroke length is difficult. Under these backgrounds, in this report we propose a fast-feed step cycle that use fast-feed command without the processing feed. Thus, we attempted to apply the response surface method to optimize these parameters. As a result, a proposed method was found to be effective to improve the drilled hole quality and drilling efficiency in such kinds of micro-drilling of the PWBs.

Quality Control of Micro-Drilled Hole Wall of PWBs Using Data-Mining

2005 ◽  
Author(s):  
Eiichi Aoyama ◽  
Toshiki Hirogaki ◽  
Keiji Ogawa ◽  
Tsuyoshi Otsuka ◽  
Katsutoshi Yamauchi
Keyword(s):  
Data Mining ◽  
Surface Roughness ◽  
Present Report ◽  
Weft Yarn ◽  
Hole Drilling ◽  
Printed Wiring Boards ◽  
Factors Affecting ◽  
Hole Wall ◽  
Using Data ◽  
Through Hole

In the manufacturing of printed wiring boards (PWBs), various methods have been developed in order to improve the circuit packaging density. Micro-drills are generally used to make smaller diameter through-holes in PWBs, which are desired for the miniaturization of equipment. However, a problem has emerged in that copper plating degraded by hole drilling can reduce the reliability of the electrical connection between layers. The surface roughness of drilled hole wall is one of the important factors affecting the plating quality. The purpose of the present report is to apply data-mining to the surface roughness data of drilled through-hole walls, and to elucidate the factors required to control the drilled hole quality. The following conclusions were obtained. (1) The data-mining aided by a computer was found to be effective to control the drilled hole wall quality in the PWBs manufacturing. (2) It was clear that the surface roughness of drilled hole walls depended on three factors: the drill temperature, cutting distance, and the width of the fiber bundle of weft yarn.

Execution Process Monitoring for Ship Curved Block Construction Based on Task Package and Workload Distribution Sheet

2013 ◽  
Vol 711 ◽  
pp. 602-607
Author(s):  
Da Ming Pei ◽  
Li Rui Wang ◽  
Qi Jin Tang
Keyword(s):  
Data Collection ◽  
Monitoring System ◽  
Process Monitoring ◽  
Top Down ◽  
Monitoring Technique ◽  
Vector Projection ◽  
Work Distribution ◽  
Block Construction ◽  
Workload Distribution ◽  
Over Time

Aiming at the demands of top-down task transmission and bottom-up status coordination in the execution of ship curved block construction, a hierarchical execution process monitoring technique considering workplace, curved block, task package (TP) and workload distribution sheet (WDS) was put forward. Adopting linear fitting and graphics epitaxy, the plane vector projection modeling for ship curved block was achieved. Based on visualized monitoring technology for curved blocks evolution over time in workplace, a hierarchical execution process monitoring system was built. Through data collection and feedback based on work distribution sheet, the backwards status coordination was implemented. At last, the validity of the proposed technique was verified by an application example.

CO2 laser tailored blank welding: process monitoring

1996 ◽  
Author(s):  
Giuseppe D'Angelo ◽  
Elena Borello ◽  
Nereo Pallaro
Keyword(s):  
Process Monitoring ◽  
Co2 Laser ◽  
Welding Process ◽  
Tailored Blank ◽  
Tailored Blank Welding
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