Search results
1 – 10 of over 45000Munish Chhabra and Rupinder Singh
This paper seeks to review the industrial applications of state‐of‐the‐art additive manufacturing (AM) techniques in metal casting technology. An extensive survey of concepts…
Abstract
Purpose
This paper seeks to review the industrial applications of state‐of‐the‐art additive manufacturing (AM) techniques in metal casting technology. An extensive survey of concepts, techniques, approaches and suitability of various commercialised rapid casting (RC) solutions with traditional casting methods is presented.
Design/methodology/approach
The tooling required for producing metal casting such as fabrication of patterns, cores and moulds with RC directly by using different approaches are presented and evaluated. Relevant case studies and examples explaining the suitability and problems of using RC solutions by various manufacturers and researchers are also presented.
Findings
Latest research to optimize the current RC solutions, and new inventions in processing techniques and materials in RC performed by researchers worldwide are also discussed. The discussion regarding the benefits of RC solutions to foundrymen, and challenges to produce accurate and cost‐effective RC amongst AM manufacturers concludes this paper.
Research limitations/implications
The research related to this survey is limited to the applicability of RC solutions to sand casting and investment casting processes. There is practically no implication in industrial application of RC technology.
Originality/value
This review presents the information regarding potential AM application – RC, which facilitates the fabrication of patterns, cores and moulds directly using the computer‐aided design data. The information available in this paper serves the purpose of researchers and academicians to explore the new options in the field of RC and especially users, manufacturers and service industries to produce casting in relatively much shorter time and at low cost and even to cast complex design components which otherwise was impossible by using traditional casting processes and CNC technology.
Details
Keywords
Dilip Sahebrao Ingole, Abhay Madhusudan Kuthe, Shashank B. Thakare and Amol S. Talankar
The purpose of this paper is to apply rapid prototyping (RP) philosophy as a technology transfer in industries to take its time and cost‐effective advantages for development of…
Abstract
Purpose
The purpose of this paper is to apply rapid prototyping (RP) philosophy as a technology transfer in industries to take its time and cost‐effective advantages for development of rapid tooling (RT).
Design/methodology/approach
Experimentations are performed for development of RT for sand casting, investment casting and plastic moulding applications.
Findings
This paper reports the procedures developed for manufacture of production tooling using RP. A cost/benefit model is developed to justify implementation of RP as a technology transfer in industries.
Research limitations/implications
The examples are limited to parts build by fused deposition modelling RP process. However, the concepts experimented may be applied for other RP processes.
Practical implications
RP has proved to be a cost‐effective and time‐efficient approach for development of RT, thereby ensuring possibility for technology transfer in casting as well as plastic industries.
Originality/value
This is the pioneer attempt towards quantifying RP benefits, in view of technology transfer. This paper presents original case studies and findings on the basis of experimentations performed in foundries.
Details
Keywords
Xiaoming Luo and Matthew C. Frank
The purpose of this paper is to present an algorithm for an additive/subtractive rapid pattern manufacturing (RPM) process where thick slabs of material are sequentially stacked…
Abstract
Purpose
The purpose of this paper is to present an algorithm for an additive/subtractive rapid pattern manufacturing (RPM) process where thick slabs of material are sequentially stacked and then cut to 3D shapes. Unlike traditional rapid prototyping processes where layer thickness is typically uniform, this process is able to vary the layer thickness in order to most effectively generate feature shapes.
Design/methodology/approach
This paper discusses the factors affecting layer thickness decisions and then presents an algorithm to determine layer thicknesses for a given part model. The system is designed to import a computer‐aided design file and use the algorithm to automatically generate the set of layers based on the slab height, material and bonding properties and the process parameters used in the system.
Findings
The layer thickness algorithm is implemented and tested using an additive/subtractive manufacturing system developed in the laboratory. The algorithm has proved effective in determining appropriate layer heights for thick slab machining, taking into account a variety of geometries. Several sand casting patterns have been successfully created using the proposed system, which could significantly improve traditional sand casting pattern manufacturing.
Originality/value
The proposed RPM process is a new process presented by the authors, developed for rapid sand castings. The layer thickness algorithm is an original contribution that enables automatic process planning for this new process.
Details
Keywords
P.M. Dickens, R. Stangroom, M. Greul, B. Holmer, K.K.B. Hon, R. Hovtun, R. Neumann, S. Noeken and D. Wimpenny
The Tooling and Casting subgroup of the European Action on Rapid Prototyping (EARP) has undertaken a project to investigate the problems associated with using rapid prototype…
Abstract
The Tooling and Casting subgroup of the European Action on Rapid Prototyping (EARP) has undertaken a project to investigate the problems associated with using rapid prototype models as sacrificial patterns for investment casting. The accuracy and surface finish of the models and the castings were also assessed so that a comparison could be made. Models from each process were manufactured by different members of EARP and then three foundries were each given a set of models to convert to castings. Observes that one of the oldest metal manufacturing techniques, which dates back to 4000‐6000 BC, is being used with one of the most modern ‐ rapid prototyping.
Details
Keywords
Radhwan Bin Hussin, Safian Bin Sharif, Shayfull Zamree Bin Abd Rahim, Mohd Azlan Bin Suhaimi, Mohd Tanwyn Bin Mohd Khushairi, Abdellah Abdellah EL-Hadj and Norshah Afizi Bin Shuaib
Rapid tooling (RT) integrated with additive manufacturing technologies have been implemented in various sectors of the RT industry in recent years with various kinds of prototype…
Abstract
Purpose
Rapid tooling (RT) integrated with additive manufacturing technologies have been implemented in various sectors of the RT industry in recent years with various kinds of prototype applications, especially in the development of new products. The purpose of this study is to analyze the current application trends of RT techniques in producing hybrid mold inserts.
Design/methodology/approach
The direct and indirect RT techniques discussed in this paper are aimed at developing a hybrid mold insert using metal epoxy composite (MEC) in increasing the speed of tooling development and performance. An extensive review of the suitable development approach of hybrid mold inserts, material preparation and filler effect on physical and mechanical properties has been conducted.
Findings
Latest research studies indicate that it is possible to develop a hybrid material through the combination of different shapes/sizes of filler particles and it is expected to improve the compressive strength, thermal conductivity and consequently increasing the hybrid mold performance (cooling time and a number of molding cycles).
Research limitations/implications
The number of research studies on RT for hybrid mold inserts is still lacking as compared to research studies on conventional manufacturing technology. One of the significant limitations is on the ways to improve physical and mechanical properties due to the limited type, size and shape of materials that are currently available.
Originality/value
This review presents the related information and highlights the current gaps related to this field of study. In addition, it appraises the new formulation of MEC materials for the hybrid mold inserts in injection molding application and RT for non-metal products.
Details
Keywords
Sunpreet Singh and Rupinder Singh
This paper aims to review the industrial and biomedical applications of state-of-the-art fused deposition modelling (FDM)-assisted investment casting (FDMAIC). Brief literature…
Abstract
Purpose
This paper aims to review the industrial and biomedical applications of state-of-the-art fused deposition modelling (FDM)-assisted investment casting (FDMAIC). Brief literature survey of methodologies, ideas, techniques and approaches used by various researchers is highlighted and use of hybrid feedstock filament-based pattern to produce metal matrix composite is duly discussed.
Design/methodology/approach
Pattern replica required for investment casting (IC) of biomedical implant, machine parts, dentistry and other industrial components can be directly produced by using FDM process is presented. Relevant studies and examples explaining the suitability of FDMAIC for various applications are also presented.
Findings
Researches to optimize the conventional IC with FDM solutions and develop new hybrid feedstock filament of FDM done by researchers worldwide are also discussed. The review highlights the benefit of FDMAIC to surgeons, engineers and manufacturing organizations.
Research limitations/implications
The research related to this survey is limited to the suitability and applicability of FDMAIC.
Originality/value
This review presents the information regarding potential IC application, which facilitates the society, engineers and manufacturing organizations by providing variety of components for assisting FDM. The information reported in this paper will serve doctors, researchers, organizations and academicians to explore the new options in the field of FDMAIC.
Details
Keywords
Xiaobi Zheng, Jiayue Qian and Danbo Chen
Many newly established Internet loss-making enterprises (NEILEs) are always willing to expand overseas within a very short time from their establishment. This phenomenon is…
Abstract
Purpose
Many newly established Internet loss-making enterprises (NEILEs) are always willing to expand overseas within a very short time from their establishment. This phenomenon is becoming a hot research area. This paper aims to explore why these enterprises are always willing to expand overseas rapidly even if they are facing severe and persistent losses, and to study the different rapid internationalization modes and the international market entry ways for NEILEs.
Design/methodology/approach
This paper constructs a theoretical framework with the dual situation of negative attainment discrepancy and advantageous slack resources to explain the rapid internationalization of NEILEs. Furthermore, cross-case comparative analysis method, based on interviews, questionnaires and secondary data collection, is adopted to reveal the rapid internationalization modes and the international market entry ways of such enterprises.
Findings
Whether blocking competitors or seeking opportunities or both, NEILEs' goal of rapid internationalization depends on the severity and persistence of negative attainment discrepancy. When the severity and persistence of negative attainment discrepancy are very significant, moderate and mild, NEILEs choose sniper-type, opportunity-type and dual-type internationalization target mode in turn; it is very important for NEILEs to match advantageous slack resources and international market entry ways to achieve specific internationalization goals.
Research limitations/implications
This paper enriches the understanding of NEILEs' transnational entrepreneurial behavior in the era of digital economy. The theoretical contribution of this paper is that the authors build a theoretical framework based on the logical starting point, the logical fulcrum and the logic ending point for understanding the rapid internationalization of NEILEs.
Practical implications
This study demonstrates that NEILEs can also expand into foreign markets according to their own characteristics. Undoubtedly, they need to choose appropriate internationalization target mode and international market entry way in line with the extent and duration of their losses, and their advantageous slack resources.
Originality/value
In this paper, the authors construct the rapid internationalization theory of NEILEs based on the dual situation of negative attainment discrepancy and advantageous slack resources in digital economy era. Moreover, the authors discover the behavioral characteristics and patterns of NEILEs' transnational entrepreneurship.
Details
Keywords
X.J. Gu, J.H. Zhu and W.H. Zhang
The purpose of this paper is to introduce, for the first time, the topology optimization method into the lattice structure configuration design for rapid casting patterns.
Abstract
Purpose
The purpose of this paper is to introduce, for the first time, the topology optimization method into the lattice structure configuration design for rapid casting patterns.
Design/methodology/approach
A structural topology optimization procedure in combination with thermo‐mechanical finite element analysis for the lattice structure configuration design has been developed.
Findings
A new mixed stress‐compliance optimization model is proposed for the strength and rigidity design. Numerical modeling about the mathematical formulation of the objective function and design constraints is established and an optimal material layout inside a given domain of the stereolithography (SL) resin pattern is found.
Originality/value
Various optimal results of lattice structure configurations are obtained numerically. By comparing the optimal designs with the existing lattice structure configurations, the newly obtained designs have shown better performances both in reducing the stress in the ceramic shell and in maintaining the stiffness of the SL pattern.
Details
Keywords
The purpose of this paper is to provide new insight concerning a relatively understudied phenomenon in the medium sized enterprise (SME) internationalisation and international…
Abstract
Purpose
The purpose of this paper is to provide new insight concerning a relatively understudied phenomenon in the medium sized enterprise (SME) internationalisation and international entrepreneurship literature; the internationalisation of firms crossing the border to only one adjacent foreign country. These firms are called border firms. This study explores the variety of internationalisation patterns of border firms.
Design/methodology/approach
The study is based on theoretical perspectives related to speed of internationalisation and country embeddedness, and uses empirical data from seven Norwegian case companies operating across the border between Norway and Russia.
Findings
Three different internationalisation patterns of border firms are empirically identified and described; an early single-country path, a born-again border path and a born border path. Then, a model of the distinctive cross-border pathway is developed.
Research limitations/implications
Several limitations of this study have implications for further research, such as sample size and setting, the new perspective on country embeddedness and questions related to generalisation of the findings.
Practical implications
The study has implications for both entrepreneurs and policy-makers. It demonstrates that internationalisation is not always about “going global” and is sometimes simply a matter of “hopping” across the nearest border. The model demonstrates different possible patterns for how to achieve or support this in practice.
Originality/value
This study contributes to theory-building in the field of SME internationalisation and international entrepreneurship in three ways. First, it identifies and defines an interesting but neglected type of international venture; border firms. Second, it explores the different start-up patterns of these firms, their speed and embeddedness. Third, it offers a theoretical framework of the distinct cross-border pathway of internationalisation.
Details
Keywords
Hashem Aghazadeh and Farzad Zandi
The purpose of the paper is twofold. Firstly, it provides an inclusive categorical framework of internationalisation patterns for small- and medium-sized enterprises, and…
Abstract
Purpose
The purpose of the paper is twofold. Firstly, it provides an inclusive categorical framework of internationalisation patterns for small- and medium-sized enterprises, and secondly, it presents unique evidence from a developing country and corroborates the proposed framework.
Design/methodology/approach
A cross-sectional convergent mixed-method design was applied to this research. A phenomenological design was used to develop the typology framework, and subsequently, practical evidence was collected through a cross-sectional survey using a self-reporting questionnaire. A two-step hierarchical clustering analysis was performed to test the framework’s robustness, and a set of characteristics was compared between the patterns via a one-way analysis of variance, F-test.
Findings
The robustness of the constructed categorical framework of 32 internationalisation patterns is substantiated, suggesting that this framework produces veracious discrimination between all patterns of internationalisation. Evidence revealed that the majority of firms showed regional and incremental internationalising behaviour. No true born globals were observed; however, several other early or fast patterns such as “born-international”, “global new venture” and “born-again regional” emerged.
Originality/value
This paper presents a categorical framework and provides evidence of the behaviour of internationalising SMEs from a Middle Eastern developing economy. The categorical framework constructed in this paper uses predefined thresholds, and it is of value because it is inclusive, rigid and incisive. This paper also provides essential insights into the sub-patterns of internationalisation, specifically the born-again and regional phenomenon of internationalisation.
Details