A new approach in free air ball formation process parameters analysis

2000 ◽  
Vol 23 (2) ◽  
pp. 116-122 ◽  
Author(s):  
Jau-Liang Chen ◽  
Yeh-Chao Lin
Keyword(s):  
Process Parameters ◽  
Formation Process ◽  
New Approach ◽  
Free Air ◽  
Parameters Analysis

Effect of Process Parameters on Free Air Ball Integrity in Copper and Palladium-coated Copper Bonding Wires

2014 ◽  
Vol 2014 (1) ◽  
pp. 000272-000277
Author(s):  
Noritoshi Araki ◽  
Yasutomo Ichiyama ◽  
Ryo Oishi ◽  
Teruo Haibara ◽  
Takashi Yamada
Keyword(s):  
Process Parameters ◽  
Formation Process ◽  
High Speed ◽  
High Speed Camera ◽  
Formation Processes ◽  
Shielding Gas ◽  
Optimization Of Process Parameters ◽  
Free Air ◽  
Bonding Wires ◽  
High Density Packaging

The Free Air Ball (FAB) formation processes of fine diameter Cu wires were observed, and the effects of process parameters were studied on the basis of high-speed camera observation. It was revealed that the FAB formation process is characterized by preheating before melting, melting that accompanies ball rising, and solidification periods. The relationships between the electronic flame-off (EFO) condition and the FAB formation were summarized for both bare Cu and palladium-coated Cu wires. Further study was performed on the changes in FAB shape with different EFO conditions, wire types, and FAB sizes. Off-centered FABs were observed in the bare Cu wire whereas they were rarely observed in the Pd-coated Cu wire. The off-center tended to be affected by shielding gas condition, EFO torch gap, and FAB size. The mechanisms of the off-centered FAB formation were proposed through the high speed camera observations. The optimization of process parameters to achieve defect-free, consistent FAB is discussed based on these findings, which is useful for the next generation high density packaging.

Effect of Process Parameters on Free Air Ball Integrity in Copper and Palladium-Coated Copper Bonding Wires

2015 ◽  
Vol 12 (2) ◽  
pp. 98-103
Author(s):  
Noritoshi Araki ◽  
Yasutomo Ichiyama ◽  
Ryo Oishi ◽  
Teruo Haibara ◽  
Takashi Yamada
Keyword(s):  
Process Parameters ◽  
Formation Process ◽  
High Speed ◽  
High Speed Camera ◽  
Formation Processes ◽  
Shielding Gas ◽  
Optimization Of Process Parameters ◽  
Free Air ◽  
Bonding Wires ◽  
High Density Packaging

The free air ball (FAB) formation processes of fine diameter Cu wires were observed, and the effects of process parameters were studied on the basis of high-speed camera observation. It was revealed that the FAB formation process is characterized by preheating before melting, melting that accompanies ball rising, and solidification periods. The relationships between the electronic flame-off (EFO) condition and the FAB formation were summarized for both bare Cu and palladium-coated Cu (PCC) wires. Further study was performed on the changes in FAB shape with different EFO conditions, wire types, and FAB sizes. Off-centered FABs were observed in the bare Cu wire whereas they were rarely observed in the PCC wire. The off-center tended to be affected by shielding gas condition, EFO torch gap, and FAB size. The mechanisms of the off-centered FAB formation were proposed through the high-speed camera observations. The optimization of process parameters to achieve defect-free, consistent FAB is discussed based on these findings, which is useful for the next generation high-density packaging.

scholarly journals Some Studies on Forming Optimization with Genetic Algorithm

2012 ◽  
Vol 2 (2) ◽  
pp. 105-112
Author(s):  
Ganesh Marotrao KAKANDIKAR ◽  
Vilas M. NANDEDKAR
Keyword(s):  
Genetic Algorithm ◽  
Process Parameters ◽  
Wide Spectrum ◽  
Simulation Software ◽  
Flow Conditions ◽  
Element Analysis ◽  
Blank Holder ◽  
New Approach ◽  
Finite Element Analysis Simulation ◽  
Selection Of

Forming is a compression-tension process involving wide spectrum of operations and flow conditions. The result of the process depends on the large number of parameters and their interdependence. The selection of various parameters is still based on trial and error methods. In this paper the authors presents a new approach to optimize the geometry parameters of circular components, process parameters such as blank holder pressure and coefficient of friction etc. The optimization problem has been formulated with the objective of optimizing the maximum forming load required in Forming. Genetic algorithm is used for the optimization purpose to minimize the drawing load and to optimize the process parameters. A finite element analysis simulation software Fast Form Advanced is used for the validations of the results after optimization.

Dressing scheme and process parameters analysis for bonnet tool in bonnet polishing

2016 ◽  
Vol 231 (19) ◽  
pp. 3569-3578
Author(s):  
Zhenzhong Wang ◽  
Quanjin Wang ◽  
Xu Yang ◽  
Shiping Chen ◽  
Xiaoming Zhuang ◽  
...  
Keyword(s):  
Process Parameters ◽  
Exact Controllability ◽  
Diamond Wheel ◽  
Speed Ratio ◽  
Matlab Simulation ◽  
Optical Elements ◽  
Bonnet Polishing ◽  
Cup Wheel ◽  
Parameters Analysis ◽  
The Stability

Bonnet polishing is widely used in final processing of optical elements, as the bonnet tool has the characteristic of fine surface adaptability and controllable pressure. For the purpose of ensuring the stability and exact controllability of polishing process, it is necessary to make precise dressing of bonnet tool. In this paper, first a dressing scheme using cup diamond wheel is proposed for bonnet tool, and then the feasibility of the dressing scheme is verified by analyzing the trajectory and the envelope of the diamond particles on the cup wheel. After that, the influences of the dressing process parameters on the dressing efficiency and trajectory distribution are defined through theoretical analysis and MATLAB simulation, and by simulation the dressing process parameters are determined. In addition, a trimmed program with variable speed ratio is proposed to homogenize the dressing tracks. Finally, an experiment was conducted to test the simulation result. This paper provides the theoretical basis for actual dressing process of the bonnet tool.

Two-stage model of prepreg bonding interface formation in automated fiber placement process

2022 ◽  
pp. 073168442110602
Author(s):  
Rui Xiao ◽  
Wang Wang ◽  
Jiaqi Shi ◽  
Jun Xiao
Keyword(s):  
Experimental Data ◽  
Physical Model ◽  
Failure Mode ◽  
Process Parameters ◽  
Formation Process ◽  
Bonding Interface ◽  
Interface Formation ◽  
Fiber Placement ◽  
Logarithmic Curve ◽  
Automated Fiber Placement

While Automated Fiber Placement (AFP) of thermoset matrix composites are widely used in the aviation industry, there is little conclusive research on the relationship between the physical model of bonding interface formation process and the actual bonding strength between prepreg layers formed in AFP process. Although massive amounts of experimental data on prepreg tack have been achieved from existing research, engineers are unable to use these data as a decisive criterion in choosing process parameters. In this research, a prepreg layup physical model based on reptation model and viscoelastic mechanical model is built, in which the bonding interface formation process is divided into two stages, namely, diffusion and viscous stage. Layup-peeling experiments are conducted via a special designed high-speed layup experimental platform so that practical AFP process parameters can be imitated, and a logarithmic curve of layup velocity-peeling energy under different layup pressure is achieved. The slope of the logarithmic curve and the surface morphology of the sample after peeling prove the correctness of the established model. Simultaneously, the experimental data proves that when prepreg is peeled off, the transition from the cohesive failure mode to the interface failure mode occurs at the laying speed between 100 mm/s and 200 mm/s. These results can be used as a reference for choosing AFP process parameters to realize the balance between good bonding quality and harmless separation of adjacent prepreg layers.

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