scholarly journals Rubber-tip Design Improvement for Die Crack Elimination at Diebond Process

2020 ◽  
pp. 1-5
Author(s):  
Rennier S. Rodriguez ◽  
Frederick Ray I. Gomez
Keyword(s):  
Contact Surface ◽  
Design Of Experiment ◽  
Process Design ◽  
Design Improvement ◽  
Full Contact ◽  
Pick And Place ◽  
Thin Silicon ◽  
Improved Design

The paper focused on the elimination of die crack occurrence at the diebond process. Design of experiment (DOE) was done on the pick and place rubber-tip design and an improved design was finalized. The improved rubber-tip configuration with smaller vacuum design and full contact surface eventually resolved the die crack issues, improving the manufacturability of thin silicon die during diebond process. For future works, the configuration could be applied for packages with similar requirement.

scholarly journals Ozone disinfection: main parameters for process design in wastewater treatment and reuse

2013 ◽  
Vol 3 (4) ◽  
pp. 337-345 ◽  
Author(s):  
Valentina Lazarova ◽  
Pierre-André Liechti ◽  
Philippe Savoye ◽  
Robert Hausler
Keyword(s):  
Process Design ◽  
Drinking Water Treatment ◽  
Organic Content ◽  
Ozone Dose ◽  
Wastewater Disinfection ◽  
Colloidal Matter ◽  
Balanced Distribution ◽  
Improved Design ◽  
Ozone Disinfection ◽  
Fast Chemical

Wastewater disinfection by ozone was investigated at pilot and full scale on different wastewater effluents and two types of ozone reactors. It was demonstrated that water quality and, in particular, suspended solids and organic content strongly influence the required ozone dose for a given level of disinfection. The increase in contact time and residual ozone concentration did not improve the log removal of viruses and bacteria. However, the ‘Ct’ approach, commonly applied in drinking water treatment can be used for wastewater ozonation, if a sufficient ozone dose can be transferred to the effluent resulting in an ozone residual which can be measured. These considerations should be taken into account for the improved design of ozonation facilities. It should be underlined that short contact times are only possible if fast balanced distribution of the ozone dose is achieved as rapidly as possible, in order to satisfy fast chemical reactions (colloidal matter destabilisation, zeta potential, etc.) and enable a uniform distributed ozone residual for the slower reactions (disinfection, oxidation of micropollutants, etc.).

scholarly journals Optimalisasi Variabel Pick and Place untuk Meningkatkan Output Proses Die Attach pada Fabrikasi Chip RFID

2021 ◽  
Vol 5 (1) ◽  
pp. 9-12
Author(s):  
Daniel Aturman Sinaga ◽  
Aditya Gautama Darmoyono ◽  
Dwi Imam Mulyono
Keyword(s):  
Design Of Experiment ◽  
Cycle Time ◽  
Die Attach ◽  
Pick And Place ◽  
Set Up

Pengaplikasian teknologi dapat mempermudah manusia dalam kehidupan sehari-hari. Salah satu tekonologi ini adalah RFID. Pada pembuatan chip RFID, timbul masalah pada proses pick and place yaitu terdapat beberapa variabel  set up mesin yang kurang optimal,  kendala tersebut membuat mesin kurang  efisien dalam waktu dan kualitas, sehingga dilakukan optimalisasi variabel-variabel tersebut. Proses optimalisasi pada penelitian ini tidak hanya mempertimbangkan cycle time yang minimum tetapi juga kualitas produk yang dihasilkan. Oleh karena itu pada tahap awal percobaan dicari selang nilai dari variabel-variabel yang akan dioptimalisasi. Pada selang ini produk yang dihasilkan masih masuk ke dalam spesifikasi kualitas yang telah ditentukan. Langkah selanjutnya adalah proses optimalisasi cycle time menggunakan Design of Experiment dengan metode RSM. Tujuannya meminimalisasikan cycle time sehingga produk dapat lebih banyak diproduksi tanpa mengorbankan kualitas. Hasil dari metoda ini adalah cycle time selama 3.188 detik dari yang sebelumnya 4.9 detik. Diketahui  pada satu leadframe terdapat 36 chip. Sehingga total waktu pick and place menurun menjadi 1.91 menit per leadframe (3.188x 36). Untuk perhitungan waktu die attach ditambah pick and place per leadframe adalah = 1.91 menit + 1.30 menit (epoxy application) + 1 menit (handling) + 0.35 menit (inspection) = 4.56 menit. Dari hasil perhitungan ini akan diperoleh UPH 13 leadframe, meningkat sebanyak 2 leadframe dari sebelumnya.

Analysis of a New Dual Excitation Flux Switching Machine with Outer-Rotor Configuration for Direct Drive EV

2014 ◽  
Vol 695 ◽  
pp. 787-791 ◽  
Author(s):  
Md Zarafi Ahmad ◽  
Erwan Sulaiman ◽  
Zainal Alam Haron ◽  
Faisal Khan ◽  
Mubin Aizat Mazlan
Keyword(s):  
Power Density ◽  
Performance Comparison ◽  
Direct Drive ◽  
Original Design ◽  
Maximum Torque ◽  
Element Analysis ◽  
Torque Density ◽  
Design Improvement ◽  
Outer Rotor ◽  
Improved Design

This paper presents the design improvement and analysis of dual excitation flux switching machine (DEFSM) with outer-rotor configuration for direct drive electric vehicle (EV). Deterministic design improvement approach based on two-dimensional (2-D) finite element analysis (FEA) is applied to obtain optimal torque density and power density of the proposed machine to meet the requirement of direct drive propulsion of EV. The performance comparison of the original design machine with the improved design machine is also addressed. The improved design machine has achieved 10.19 Nm/kg and 4.74 kW/kg of maximum torque density and maximum power density, respectively..

Evolution of Robust Manufacturing Process in Machining of DC Motor Commutator Using Complementing Problem Solving Tools

2015 ◽  
Vol 766-767 ◽  
pp. 1183-1189
Author(s):  
A.J. Jagadeesan ◽  
L. Karunamoorthy ◽  
N. Arunkumar
Keyword(s):  
Problem Solving ◽  
Contact Surface ◽  
Process Design ◽  
Manufacturing Process ◽  
Real Root ◽  
Physical Mechanism ◽  
Complete Removal ◽  
Mechanism Analysis ◽  
Root Cause ◽  
Combined Use

Machining the mica insulation in commutator to provide under cut in the surface of contact with the carbon brush is a vital process related to the life of the product. Complete removal of mica in the contact surface is essential and this requires complex sensing and positioning of the thin mica layer during machining. This study revealed improving the sensing and positioning technologies is not adequate and evolved a robust product-process design to overcome the real root cause of variations in the manufacturing process. Combined use of orthogonal array, Shainin technique, physical-mechanism analysis, relations-diagram and evaporating-cloud method complemented the problem solving approach in gaining knowledge and evolving robustness.

Design of Experiment Analysis of Plain ZDDP Oil in the Presence of FeF3 Using Two Different Rotational Speeds and Extreme Contact Load

2011 ◽  
Author(s):  
Gabi Nehme
Keyword(s):  
Surface Temperature ◽  
Boundary Lubrication ◽  
Contact Surface ◽  
Design Of Experiment ◽  
Contact Temperature ◽  
Hertzian Contact ◽  
Contact Load ◽  
Lower Stage ◽  
Lower Load ◽  
The One

The purpose of this study was to investigate the effect of cooling contact surface temperature of the test cylinder when a rise in contact temperature over 100 degree C occurs during boundary lubrication tribological testing. The Hertzian contact pressure in a ball on cylinder tests will be optimized with respect to the contact temperature using Design of Experiment (DOE) software. Several boundary lubrication tests were conducted to study the behavior of 0.1 P% (phosphorus percentage) plain ZDDP oil in the presence of 0.4% FeF3 under two different rotational speeds (lower stage of 100 rpm for the first 5000 revolutions and higher stage of 700 rpm until failure or 100000 revolutions whichever comes first). The one rotational speed of 700 rpm until failure will be compared to the two speed stages under a contact cooling surface temperature and different contact loads (2.77GPa–3.8Gpa Hertzian contact pressures). The two different speed stages indicate better performance under an extreme contact load and a lower contact surface temperature; whereas higher contact surface temperature and lower load are needed for the one speed stage of 700 rpm cycle.

Design Improvement of Manipulators by Minimizing Shaking Force/Moment and Driving Torques

1992 ◽  
Author(s):  
Muqtada Husain ◽  
Akhtar K. Mallik ◽  
A. Ghosh
Keyword(s):  
Mechanical Design ◽  
Open Loop ◽  
Design Improvement ◽  
Trade Offs ◽  
Proper Mass ◽  
Force Moment ◽  
Manipulator Arm ◽  
Improved Design ◽  
The Given ◽  
Shaking Moment

Abstract In this work, an algorithm for design improvement of open loop manipulators, after allowing for the necessary trade-offs among the maximum shaking force, shaking moment and the driving torques is presented. The improved design is attempted by only proper mass distribution of the links for the given kinematic structure and link masses. A min-max optimization problem, considering the worst configuration, is formulated via closed form expressions of the dynamical quantities derived by using Newton-Euler approach. The procedure, though applicable in general, is illustrated through the design of the arm structure of a PUMA 560 manipulator. This developed procedure will also be very helpful in the mechanical design of any new manipulator arm.

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