Impact of selected work condition factors on quality of manual assembly process

2010 ◽  
Vol 21 (2) ◽  
pp. 156-163 ◽  
Author(s):  
Adam Hamrol ◽  
Dagmara Kowalik ◽  
Agnieszka Kujawińsk
Keyword(s):  
Assembly Process ◽  
Manual Assembly ◽  
Work Condition

scholarly journals Design of on-line system for measuring and tracking time of assembly

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Katarína Senderská ◽  
Albert Mareš ◽  
Emil Evin
Keyword(s):  
Assembly Process ◽  
Manual Assembly ◽  
Line System ◽  
Proposed Model ◽  
On Line ◽  
Tracking Time ◽  
Work Done ◽  
Line Analysis

Abstract Manual assembly performed at assembly workstations nowadays still has a unique place in different kinds of production. To increase the productivity and quality of manual assembly it is necessary to analyse the existing workplaces and find ways to improve and streamline work done at these workplaces. The article deals with the design of a model for on-line analysis of a manual assembly process. The proposed model is based on the use of sensors or the so-called button-box and the use of software for recording and evaluating data. Based on the obtained data it is then possible to evaluate the time characteristics of the assembly process, aswell as to find sources of delays and mistakes and then take appropriate action to correct them.

scholarly journals Comparing Augmented Reality-Assisted Assembly Functions—A Case Study on Dougong Structure

2020 ◽  
Vol 10 (10) ◽  
pp. 3383 ◽  
Author(s):  
Chih-Hsing Chu ◽  
Chien-Jung Liao ◽  
Shu-Chiang Lin
Keyword(s):  
Augmented Reality ◽  
Assembly Process ◽  
Functional Design ◽  
Complex Objects ◽  
Manual Assembly ◽  
Scale Models ◽  
Architectural Innovation ◽  
Assembly Instructions

The Dougong structure is an ancient architectural innovation of the East. Its construction method is complex and challenging to understand from drawings. Scale models were developed to preserve this culturally-unique architectural technique by learning through their assembly process. In this work, augmented reality (AR)-based systems that support the manual assembly of the Dougong models with instant interactions were developed. The first objective was to design new AR-assisted functions that overcome existing limitations of paper-based assembly instructions. The second one was to clarify whether or not and how AR can improve the operational efficiency or quality of the manual assembly process through experiments. The experimental data were analyzed with both qualitative and quantitative measures to evaluate the assembly efficiency, accuracy, and workload of these functions. The results revealed essential requirements for improving the functional design of the systems. They also showed the potential of AR as an effective human interfacing technology for assisting the manual assembly of complex objects.

Optimization of the installation sequence for the temporary fasteners in the aircraft industry

2021 ◽  
pp. 1-25
Author(s):  
Tatiana Pogarskaia ◽  
Sergey Lupuleac ◽  
Julia Shinder ◽  
Philipp Westphal
Keyword(s):  
Combinatorial Problem ◽  
Hole Drilling ◽  
Assembly Process ◽  
Process Verification ◽  
Final Assembly ◽  
Uncertain Input ◽  
Uncertain Input Data ◽  
Aircraft Production

Abstract Riveting and bolting are common assembly methods in aircraft production. The fasteners are installed immediately after hole drilling and fix the relative tangential displacements of the parts, that took place. A proper fastener sequence installation is very important because a wrong one can lead to a “bubble-effect”, when gap between parts after fastening becomes larger in some areas rather than being reduced. This circumstance affects the quality of the final assembly. For that reason, the efficient methods for determination of fastening sequence taking into account the specifics of the assembly process are needed. The problem is complicated by several aspects. First of all, it is a combinatorial problem with uncertain input data. Secondly, the assembly quality evaluation demands the time-consuming computations of the stress-strain state of the fastened parts caused by sequential installation of fasteners. Most commonly used strategies (heuristic methods, approximation algorithms) require a large number of computational iterations what dramatically complicates the problem. The paper presents the efficient methods of fastener sequence optimization based on greedy strategy and the specifics of the assembly process. Verification of the results by comparison to commonly used installation strategies shows its quality excellence.

A NEW METHOD OF LENS CENTERING IN THE OPTICAL SYSTEM BY USING SPECIAL MOUNT

2021 ◽  
pp. 137-144
Author(s):  
Bao Bui Dinh
Keyword(s):  
Optical System ◽  
Optical Axis ◽  
Assembly Process ◽  
Optical Surface ◽  
Lens System ◽  
High Quality ◽  
Manufacturing Equipment ◽  
Influence Coefficients ◽  
Process Solutions

Decentration in lens systems (for example objectives) significantly degrades the quality of image, such as the coma. In order to reduce lens decentration, the lenses are centered while manufacturing, while gluing, while attachment in the mounts. Significant decrease in the lenses decentering in the mounts is achieved by using a special manufacturing equipment, which allow combining the optical axis of the lens with the base axis of the mount in assembly process. Solutions for coma's alignment by shifting, tilting and rotation their components are also provided in the construction of high-quality objectives (microscopes [1-7], photolithographic, aerophotographic). For optimization of methods for such adjustment the influence coefficients of decentering of each optical surface of the lens system on the value and sign of coma must be calculated and taken into account. In this paper, we propose a special mounting which combined with the Opticentric of Trioptics device to center the lenses. The results show that the decentering is significantly reduced (0.9µm) compared to (44.2µm) with using a reference mount.

Simulation of the Wing-to-Fuselage Assembly Process

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Sergey Lupuleac ◽  
Nadezhda Zaitseva ◽  
Maria Stefanova ◽  
Sergey Berezin ◽  
Julia Shinder ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Contact Problem ◽  
Assembly Process ◽  
Multistage Process ◽  
Stochastic Nature ◽  
Closing The Gap ◽  
Compliant Parts ◽  
Level Parallelism ◽  
Task Level

The paper presents a simulation of the Airbus A350-900 wing-to-fuselage assembly process. The latter is a complex multistage process where the compliant parts are being joined by riveting. The current research analyzes the quality of the temporary fastener arrangement. The fastener arrangement is being checked to ensure that the residual gap between joined parts is small, and the fastener loads closing the gap are calculated. The deviations of the part shape from nominal are modeled via initial gaps. A cloud of initial gaps is generated based on the statistical analysis of the available measurements assuming the stochastic nature of local gap roughness. Through the reduction of the corresponding contact problem to a quadratic programming (QP) problem and the use of efficient QP algorithms together with the task-level parallelism, the mass contact problem solving on refined grids is accomplished.

Avoidance of Bonding Pad Contamination Affecting Back-End Assembly Process

2008 ◽  
Author(s):  
Mu-Chun Wang ◽  
Kuo-Shu Huang ◽  
Zhen-Ying Hsieh ◽  
Shuang-Yuan Chen ◽  
Heng-Sheng Huang
Keyword(s):  
High Performance ◽  
Gold Wire ◽  
Assembly Process ◽  
Bond Performance ◽  
Root Cause ◽  
Wire Bond ◽  
Fine Pitch ◽  
Promising Solution ◽  
Adhesion Process

While the process fabrication and the electronic applications develop quickly, the die size and the package type also confront the improvement from the customers’ request to achieve the better signal performance in IC products. In cost consideration and marketing competition, most of commercial IC products still adopt the wire-bond technology, except some high performance products with solder/gold balls adhesion process. For consumer ICs, the gold wire is the major material to connect the IC chip and the lead frame through the bondability technology. In the recent era, the bond pad size and pitch is always shrinking. Therefore, the bond performance strongly depends on wire bond machine to provide lighters, thinner, and more reliable IC. After pad size shrinkage, the quality of pad is more impressed for wire bond reliability, especially in fine-pitch assembly process. It’s a challenge in reliability requirement. In this study, the root cause and promising solution of bond pad contamination were investigated. One is to improve the bonding yield in wire-bond process; the other is to promote the bonding reliability after the whole assembly process.

A Note on Hydraulic Leaks for Mobile Equipment

2010 ◽  
Author(s):  
Mahmoud I. Awad ◽  
Ali A. Alkelani
Keyword(s):  
Environmental Impact ◽  
Failure Modes ◽  
Assembly Process ◽  
Face Seal ◽  
Impact Reduction ◽  
Different Types ◽  
Potential Improvement ◽  
The Many ◽  
Reduction Cost

Leaks in general and hydraulic leaks in specific are one of the major failure modes for mobile equipment. In-plant leak rates may range from 1 to 25%, while field leaks may range from 1 to 13% depending on the complexity of the system, assembly process, and parts quality. In this paper, the main potential leak causes are discussed and the performance of different types of fittings is compared; including JIC 37 Flare Fittings, O-Ring Boss Seal, and O-Ring Face Seal. Several potential improvement actions related to assembly process, torque specifications, and quality of manufactured fittings are recommended to reduce leaks. Among the many benefits leak reduction will result in are customer safety and satisfaction, assembly down time reduction, cost and warranty reduction, and environmental impact reduction.

scholarly journals Penyusunan SOP (Standard Operational Procedures) Perpustakaan untuk Meningkatkan Mutu Pelayanan Perpustakaan Perguruan Tinggi

2012 ◽  
Vol 13 (2) ◽  
Author(s):  
Elva Rahmah
Keyword(s):  
Service Quality ◽  
Professional Behavior ◽  
Work Condition ◽  
Is Implementation ◽  
University Library ◽  
Ongoing Work ◽  
External Organization ◽  
Operational Activity ◽  
Standard Service

The implementation of SOP (Standard Operational Procedures) in university library is needed to improve the service quality. The arrangement of SOP in University library includes four stages. The first is analysis of SOP needs. The beginning step in arranging of SOP is by analyzing SOP that will be created. Furthermore, the SOP that created depends on the ongoing work condition and procedures. The second is the development of SOP. Because of the change of internal and external organization of university library, SOP also has to change. The third is implementation of SOP. In implementing SOP, it is hoped that there is a balance between the availability of SOP, that organizes the operational activity of university library, and the human resources, that have professional behavior in arranging the library. The fourth is observation and evaluation. In order to implement SOP properly, it should be assessed by reviewers. These four steps are done in sequence to produce SOP that is appropriate to field needs for supporting the completeness of integrated quality management in university library. Therefore, the standard service quality of library can be measured by having SOP. Thus, the service quality which is given to visitors can be determined based on SOP. Keywords: library service, service quality, SOP

Sign in / Sign up

Export Citation Format

Share Document