Minimizing Geometric Variation in Multistage Assembly Lines by Geometrical Decoupling

2011 ◽  
Author(s):  
Peter Edholm ◽  
Lars Lindkvist ◽  
Rikard So¨derberg
Keyword(s):  
Assembly Line ◽  
Manufacturing Companies ◽  
Assembly Lines ◽  
Root Cause ◽  
Geometrical Quality ◽  
Geometrical Variation ◽  
Definition Of ◽  
Geometric Variation ◽  
Sheet Metal Assembly

Geometrical part robustness is used today as an engineering criterion in many manufacturing companies. The goal is to minimize the effect of geometrical variation by optimizing the locating schemes for the parts. Several methods and tools now exist to support geometrical robustness optimization for parts, but also for assemblies. In this paper the focus is on geometrical decoupling, which is one parameter of geometrical robustness of the different locating strategies in a complete assembly line. A goodness value is proposed that describes the level of geometrical couplings in a complete assembly line together with the part robustness value. By calculating this goodness value it is possible to predict the geometrical sensitivity of a complete assembly line as well as predicting the risk of geometrical variation in the final product. To illustrate the definition of this goodness value, and also the purpose of calculating it, a case study is used where a part of a sheet metal assembly line is described. Several different scenarios (assembly concepts) are applied to clarify the meaning and to validate this definition of the goodness value. The case study shows that the goodness value gives a good indication of the level of geometrical couplings within the assembly line and that this value can be used to evaluate different assembly concepts, with their locating concepts, against each other. The goal is to have a more robust and also geometrically decoupled assembly line which enables root-cause analysis in production, and also optimizes the geometrical quality minimizing the effect of geometrical variation of the final product from the plant.

Geometrical Coupling Analysis to Reduce Complete Assembly Line Complexity

2012 ◽  
Author(s):  
Peter Edholm ◽  
Lars Lindkvist ◽  
Rikard Söderberg
Keyword(s):  
Sheet Metal ◽  
Assembly Line ◽  
Golden Rule ◽  
Assembly Lines ◽  
Root Cause ◽  
Geometrical Complexity ◽  
Geometrical Quality ◽  
Complex Process ◽  
Geometrical Variation ◽  
Geometric Variation

Modern assembly lines for mass production need to fulfill several important criteria. One of them is to produce products with high geometrical quality (small geometric variation). For sheet metal assemblies, focused on in this paper, it is a very complex process to achieve good geometrical quality due to the large number of assembly steps and the geometrical variation (tolerances) of the incoming parts. One “golden rule” for sheet metal assembly lines is to always reuse fixturing points (locators) throughout the whole assembly line to minimize the geometrical variation and also the complexity of root cause analysis. A new method to measure the complexity in an assembly line has been developed and also implemented in a commercial software for Computer Aided Tolerancing. This new tool not only demonstrates the “golden rule” but could also be used to ensure minimum geometrical complexity in assembly lines to ensure controlled production and high quality products.

Territorial capital as a company intangible

2016 ◽  
Vol 17 (1) ◽  
pp. 148-167 ◽  
Author(s):  
Mariachiara Barzotto ◽  
Giancarlo Corò ◽  
Mario Volpe
Keyword(s):  
Great Difficulty ◽  
Future Research ◽  
Manufacturing Companies ◽  
Policy Makers ◽  
Content Type ◽  
Capital Growth ◽  
Multiple Case ◽  
Definition Of ◽  
A Company

Purpose – The purpose of this paper is twofold. First, to explore to what extent being located in a territory is value-relevant for a company. Second, to understand if a company is aware of, and how it can sustain, the territorial tangible and intangible assets present in the economic area in which it is located. Design/methodology/approach – The study presents an empirical multiple case-study, investigating ten mid-/large-sized Italian companies in manufacturing sectors. Findings – The results indicate that the sampled manufacturing companies are intertwined with the environment in which they are embedded, both in their home country and in host ones. The domestic territorial capital has provided, and still provides, enterprises with workers endowed with the necessary technical skills that they can have great difficulty in finding in other places. In turn, companies support territorial capital generation through their activities. Research limitations/implications – To increase the generalisability of the results, future research should expand the sample and examine firms based in different countries and sectors. Practical implications – Implications for policy makers: developing effective initiatives to support and guide a sustainable territorial capital growth. Implications for managers and investors: improving managerial and investors’ decisions by disclosing a complete picture of the enterprise, also outside the firm boundaries. Originality/value – The study contributes to intangibles/intellectual capital literature by shedding light on the importance of including territorial capital in a company’s report to improve the definition of the firm’s value. Accounting of the territorial capital would increase the awareness of the socio-economic environment value in which companies are located and its use.

Variation Analysis for Compliant Assembly

2000 ◽  
Author(s):  
S. Jack Hu ◽  
Yufeng Long ◽  
Jaime Camelio
Keyword(s):  
Sheet Metal ◽  
Assembly Line ◽  
Assembly Process ◽  
Variation Analysis ◽  
Assembly Lines ◽  
Compliant Assembly ◽  
Single Station ◽  
Dimensional Variation ◽  
Sheet Metal Assembly

Abstract Assembly processes for compliant non-rigid parts are widely used in manufacturing automobiles, furniture, and electronic appliances. One of the major issues in the sheet metal assembly process is to control the dimensional variation of assemblies throughout the assembly line. This paper provides an overview of the recent development in variation analysis for compliant assembly. First, the unique characteristics of compliant assemblies are discussed. Then, various approaches to variation modeling for compliant assemblies are presented for single station and multi-station assembly lines. Finally, examples are given to demonstrate the applications of compliant assembly variation models.

scholarly journals Mixed integer linear programming models for minimizing ergonomic risk dispersion in an assembly line at the Nissan Barcelona factory

2018 ◽  
pp. 72-89 ◽  
Author(s):  
Joaquín Bautista-Valhondo ◽  
Rocío Alfaro-Pozo
Keyword(s):  
Assembly Line ◽  
Mixed Model ◽  
Assembly Line Balancing ◽  
Mixed Integer ◽  
Assembly Lines ◽  
Absolute Deviation ◽  
Mixed Model Assembly Lines ◽  
Average Maximum ◽  
Ergonomic Risk

We present a variant of the approach to the assembly line balancing problems, with the aim of reducing the ergonomic risk for operators of mixed-model assembly lines (MILP-3). Specifically, the MILP-3 model is focused on minimizing the average range between ergonomic risk values of workstations. Using a case study from Nissan’s plant in Barcelona, not only are the differences between levels of ergonomic risk of stations reduced, but we attempt to reduce the average maximum ergonomic risk of the assembly line. The new model is compared with two others, MILP-1 and MILP-2, which minimize the average maximum ergonomic risk and the average absolute deviation of the risks, respectively.

Modeling in Mixed-Model Assembly Lines Based on Object-Oriented Petri Net

2014 ◽  
Vol 945-949 ◽  
pp. 3156-3159
Author(s):  
Hai Dong ◽  
Heng Bao Xin ◽  
Jian Hua Yan
Keyword(s):  
Petri Net ◽  
Mixed Model ◽  
Object Oriented ◽  
Message Delivery ◽  
Assembly Lines ◽  
Mixed Model Assembly Lines ◽  
Definition Of ◽  
Property Verification ◽  
Mixed Model Assembly

In order to model clearly in mixed-model assembly lines, this paper proposes an Object-oriented Petri Net (OOPN) approach by combining object-oriented concept with Petri net theory. Firstly, the mathematical definition of OOPN was given. Secondly, taking automobile transmission mixed-model assembly lines as an example, the modeling through three different levels of assembly cells, assembly resources and the whole system was finished, and the message delivery mechanism and system behavior were then described in detail. Finally, the case study shows that OOPN can deal well with the complexity of modeling, and it lays the foundation of further analysis and property verification in the mixed-model assembly lines.

scholarly journals A Generic Methodology for Calculating Rescheduling Time for Multiple Unexpected Events in the Era of Zero Defect Manufacturing

2021 ◽  
Vol 7 ◽  
Author(s):  
Foivos Psarommatis ◽  
Giacomo Martiriggiano ◽  
Xiaochen Zheng ◽  
Dimitris Kiritsis
Keyword(s):  
Response Time ◽  
Manufacturing Industry ◽  
Production Systems ◽  
Dynamic Environment ◽  
Manufacturing Companies ◽  
Event Management ◽  
Unexpected Events ◽  
Management Algorithm ◽  
Definition Of

Nowadays, the manufacturing industry is constantly changing. Production systems must operate in a highly dynamic environment where unexpected events could occur and create disruption, making rescheduling inevitable for manufacturing companies. Rescheduling models are fundamental to the robustness of production processes. This paper proposes a model to address rescheduling caused by unexpected events, aiming to achieve the zero-defect manufacturing (ZDM) concept. The goal of the model is to incorporate traditional and ZDM–oriented events into one methodology to calculate when the next rescheduling will be performed to effectively react to unexpected events. The methodology relies on the definition of two key time parameters for each event type: event response time (RT) and event delay response time (DRT). Based on these parameters, an event management algorithm is designed to identify the optimal rescheduling solution. The DRT parameter is calculated based on a multi-parametric dynamic formula to capture the dynamics of production. Moreover, ANOM, and ANOVA methods are used to analyse the behaviour of the developed method and to assess the level of robustness of the proposed approach. Finally, a case study based on real production scenarios is conducted, a series of simulation experiments are performed, and comparisons with other rescheduling policies are presented. The results demonstrate the effectiveness of the proposed event management algorithm for managing rescheduling.

A Productivity Improvement of a Packing Line

2015 ◽  
Vol 789-790 ◽  
pp. 1240-1244
Author(s):  
Peeyapach Jitchaiyaphum ◽  
Suksan Prombanpong
Keyword(s):  
Production Line ◽  
Assembly Line ◽  
Waste Reduction ◽  
Line Balancing ◽  
Assembly Lines ◽  
Customer Demand ◽  
Productivity Improvement ◽  
Manual Assembly ◽  
Line Design

The purpose of this paper is to demonstrate a productivity improvement through waste reduction and line balancing. One of the obstacles of a manual assembly line nowadays is an awkward line design with over manpower, a lot of wastes, and low balance efficiency. As a result, the production line may not satisfy customer demand and ends up with low production line efficiency. This is due to the fact that this type of production line is operated by human and the customer demand or requirements are frequently fluctuated. Human workers are prone to make mistakes, inefficient, and unorganized. Thus, the major causes of production line down time are discussed with suggestion of remedy actions to improve the productivity. In addition, calculation of line balancing is demonstrated. One of the actual manual assembly lines will be used as a case study. It is found that after improvement line balance efficiency is increased from 46.49 to 86.66 percent with the productivity improvement of 159 percent.

scholarly journals Assessment of Manufacturing Processes for Automated Timber-Based Panelised Prefabrication

Buildings ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 125 ◽  
Author(s):  
Kristopher Orlowski
Keyword(s):  
Assembly Line ◽  
Manufacturing Processes ◽  
Wall Panel ◽  
Assembly Lines ◽  
Local Conditions ◽  
Industry Partner ◽  
Industry Practice ◽  
Manufacturing Assembly ◽  
Process Level

The manufacturing processes involved in the prefabrication of timber-based panelised walls is presented and explored in this study, through current industry practice and the latest automated technological solutions. A weighted Multi Criteria Analysis (MCA) was constructed as a preliminary mechanism for assessment of current practices in conducting manufacturing processes compared to leading automated solutions. The developed method can be used to evaluate any timber-based wall panel manufacturing assembly line and to suggest recommended automation-based improvements on a process level in order to achieve prefabricated manufacturing objectives specific to local conditions and requirements. This has been demonstrated and verified through a case study with an industry partner. The resultant recommendations obtained close the knowledge gaps in the market and academia in uncovering recommended areas for investment and development to advance assembly lines at certain key processes in the production of timber-based walls for panelised construction.

scholarly journals Marginality as a Root Cause of Urban Poverty: A Case Study of Punjab

2015 ◽  
Vol 54 (4I-II) ◽  
pp. 629-650
Author(s):  
Kanwal Zahra ◽  
Tasneem Zafar
Keyword(s):  
Urban Poverty ◽  
Multidimensional Poverty ◽  
Developed Countries ◽  
Standard Of Living ◽  
Economic Empowerment ◽  
Root Cause ◽  
The Social ◽  
Key Factor ◽  
Definition Of

Historically poverty as a concept was considered to be a key factor to design social policy. The social development normally is concerned with socio-economic empowerment of the poor of the concerned society. It is always been a key issue for developing as well as developed countries, however the nature and treatment of issue varies. The treatment of poverty is different from society to society. In advanced countries, an individual who is unable to actively participate in society or has weak social network, environment, health and education etc. is considered to be poor. Financial empowerment is also considered to be important in these countries but it takes into account with other dimensions of poverty [Lyberak and Tinios (2005)]. However, in developing countries, policy focus is still on uni-dimensional definition of poverty where a single dimension either consumption or income is a strong factor that affects the standard of living of an individual [Wagle (2005)]. Though the multidimensional poverty concept is also getting attractiveness in these countries with a perception that an individual’ status in one dimension cannot represent his status in another dimension but still there remains dearth of policy-making. Another important transformation in the literature on poverty is seen in terms of identification of nexus of marginality, social exclusion and poverty [Ruth, et al. (2007); Zoran, et al. (2006); Whelan and Bartrand (2005)]

scholarly journals Appropriate Smart Factory for SMEs: Concept, Application and Perspective

2020 ◽  
Vol 22 (1) ◽  
pp. 201-215
Author(s):  
Woo-Kyun Jung ◽  
Dong-Ryul Kim ◽  
Hyunsu Lee ◽  
Tae-Hun Lee ◽  
Insoon Yang ◽  
...  
Keyword(s):  
Manufacturing Industry ◽  
Industrial Revolution ◽  
Low Cost ◽  
Smart Factory ◽  
Small Data ◽  
Manufacturing Companies ◽  
Technical Application ◽  
Definition Of ◽  
Garment Manufacturing

AbstractIn the manufacturing industry, the smart factory is considered the final stage of the Fourth Industrial Revolution. Manufacturing companies are pursuing breakthroughs by introducing various advanced technologies to ensure their competitiveness. However, it is difficult for small and medium-sized enterprises (SMEs) to adopt smart-factory technologies, owing to financial and technical burdens. This paper proposes a smart factory that can be applied technically and strategically to the introduction of a smart factory for SMEs. The concept of an ‘appropriate smart factory’ involves applying appropriate measures in terms of cost and scale with consideration of the situations faced by SMEs. The goal is to build a smart factory that has necessary functions (Essential) but can be easily operated (Simple) at a low cost (Affordable) and has compatibility (Interoperable). This paper presents technical application measures such as appropriate smart sensors, appropriate IoT (Internet of Things), and small data processing, along with the definition of an appropriate smart factory. In addition, a case study was examined where the quality inspection equipment for garment manufacturing SMEs was developed by applying the appropriate smart factory concept.

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