The Experts below are selected from a list of 1118436 Experts worldwide ranked by ideXlab platform
Sanjay Sharma - One of the best experts on this subject based on the ideXlab platform.
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Cycle time Reduction in context to the make to order (MTO) environment
Journal of Manufacturing Technology Management, 2013Co-Authors: Sanjay SharmaAbstract:Purpose – A flexible production rate has been discussed and analyzed in the literature for different business situations. This paper aims to consider this for a make‐to‐order (MTO) environment.Design/methodology/approach – Generally the production rate and cycle time are significant parameters among others, where other parameters might include demand, and production time cost. An improvement in the cycle time or the cycle time Reduction is a prime objective in the context of an overall productivity improvement particularly in the MTO environment. In order to gain some insights, an interaction of the production rate and cycle time is described.Findings – The focus of the present paper is on the supply chain cost using these parameters among others. A framework for the conceptual understanding and analysis is provided along with the practical implementation issues.Originality/value – A relevant measure for the degree of flexibility (DOF) in the context of supply chain is also discussed in this paper.
Debes Bhattacharyya - One of the best experts on this subject based on the ideXlab platform.
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rotational molding cycle time Reduction using a combination of physical techniques
Polymer Engineering and Science, 2009Co-Authors: Mohamad Zaki Abdullah, Simon Bickerton, R J Crawford, Debes Bhattacharyya, Eileen HarkinjonesAbstract:Rotational molding is a process used to manufacture hollow plastic products, and has been heralded as a molding method with great potential. Reduction of cycle times is an important issue for the rotational molding industry, addressing a significant disadvantage of the process. Previous attempts to reduce cycle times have addressed surface enhanced molds, internal pressure, internal cooling, water spray cooling, and higher oven air flow rates within the existing process. This article explores the potential benefits of these cycle time Reduction techniques, and combinations of them. Recommendations on a best practice combination are made, based on experimental observations and resulting product quality. Applying the proposed molding conditions (i.e., a combination of surface-enhanced molds, higher oven flow rates, internal mold pressure, and water spray cooling), cycle time Reductions of up to 70% were achieved. Such savings are very significant, inviting the rotomolding community to incorporate these techniques efficiently in an industrial setting.
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rotational molding cycle time Reduction through surface enhanced molds part a theoretical study
Polymer Engineering and Science, 2007Co-Authors: Mohamad Zaki Abdullah, Simon Bickerton, Debes BhattacharyyaAbstract:Rotational molding has been regarded as a plastic molding method with great potential. The process offers virtually stress-free products having no weld lines or material wastage, and utilizes relatively inexpensive molds. Yet its widespread growth is hindered due to long production cycle times, which are limited by the time required to heat up and cool down the mold and the product. To address this issue, efforts have been made to enhance heat transfer to and from molds, ultimately reducing cycle times. The application of extended and rough surfaces to molds is investigated here. The aim of this study is to predict Reductions in cycle time due to the enhancement of mold surfaces (i.e. roughness-enhanced and pin-enhanced molds). By utilizing a combination of heat transfer correlations, numerical analysis, and an existing rotational molding process simulation, cycle time predictions were made. The average predicted cycle time Reductions were ∼21 and 32% for the roughness-enhanced and pin-enhanced molds considered, under a variety of conditions. POLYM. ENG. SCI., 47:1406–1419, 2007. © 2007 Society of Plastics Engineers
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rotational molding cycle time Reduction through surface enhanced molds part b experimental study
Polymer Engineering and Science, 2007Co-Authors: Mohamad Zaki Abdullah, Simon Bickerton, Debes BhattacharyyaAbstract:Rotational molding is a process used to manufacture hollow plastic products, and has been heralded as a molding method with great potential. Because of long production cycle times, which are limited by the time required to heat-up and cool-down the mold and the product, its productivity is hampered. To address this issue, exterior mold modification techniques (i.e. the application of extended and rough surfaces) have been employed to enhance heat transfer to and from molds, ultimately reducing cycle times. Extended surfaces have the potential to enhance heat transfer by increasing the surface area. Roughness elements are utilized in conjunction with turbulent flows, also producing significant increases in heat transfer rates. Experimental results presented here demonstrate very significant cycle time Reductions through the use of surface-enhanced molds. The experimental savings are in the order of 18 and 28%, whereas the predicted cycle time Reductions are around of 21 and 32% for roughness-enhanced and pin-enhanced molds, respectively. Although the prediction methods have been unable to forecast the exact experimental cycle times very accurately, they have proved to be useful for predicting the approximate cycle time Reductions and the relative rankings of the plain and the surface-enhanced molds. POLYM. ENG. SCI., 47:1420–1429, 2007. © 2007 Society of Plastics Engineers
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Rotational molding cycle time Reduction through surface‐enhanced molds, Part B: Experimental study
Polymer Engineering and Science, 2007Co-Authors: Mohamad Zaki Abdullah, Simon Bickerton, Debes BhattacharyyaAbstract:Rotational molding is a process used to manufacture hollow plastic products, and has been heralded as a molding method with great potential. Because of long production cycle times, which are limited by the time required to heat-up and cool-down the mold and the product, its productivity is hampered. To address this issue, exterior mold modification techniques (i.e. the application of extended and rough surfaces) have been employed to enhance heat transfer to and from molds, ultimately reducing cycle times. Extended surfaces have the potential to enhance heat transfer by increasing the surface area. Roughness elements are utilized in conjunction with turbulent flows, also producing significant increases in heat transfer rates. Experimental results presented here demonstrate very significant cycle time Reductions through the use of surface-enhanced molds. The experimental savings are in the order of 18 and 28%, whereas the predicted cycle time Reductions are around of 21 and 32% for roughness-enhanced and pin-enhanced molds, respectively. Although the prediction methods have been unable to forecast the exact experimental cycle times very accurately, they have proved to be useful for predicting the approximate cycle time Reductions and the relative rankings of the plain and the surface-enhanced molds. POLYM. ENG. SCI., 47:1420–1429, 2007. © 2007 Society of Plastics Engineers
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ROTATIONAL MOLDING CYCLE TIME Reduction VIA EXTERIORMOLD MODIFICATION
2005Co-Authors: Mohamad Zaki Abdullah, Simon Bickerton, Debes BhattacharyyaAbstract:Production cycle times for rotational molding are limited by the time required to heat up and cool down the mold and the product. Consequently, efforts have been made to enhance heat transfer to and from molds, ultimately reducing cycle times. The application of pins and roughened textures to molds has been investigated with several techniques being employed to predict the enhancement of heat transfer. To validate these predictions a series of rotomolding trials have been carried out using surface enhanced molds. Excellent cycle time Reductions in the order of 30 and 20% have been achieved for the pin and roughness enhanced molds respectively, demonstrating the significant benefits mold exterior modification can provide to the industry.
Jennifer Robinson - One of the best experts on this subject based on the ideXlab platform.
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integrating targeted cycle time Reduction into the capital planning process
Winter Simulation Conference, 1998Co-Authors: Navdeep S Grewal, Alvin C Bruska, Timbur M Wulf, Jennifer RobinsonAbstract:This paper describes the development and application of an integrated static capacity and dynamic simulation analysis methodology for purchasing equipment capacity. The goal of the study is to address targeted cycle time objectives in a start up recording head wafer manufacturing facility at Seagate Technology, Minneapolis, MN. The short product cycle time, coupled with the competitive nature of the disc drive industry, has made cycle time Reduction one of the most important objectives of production capacity planning. This paper describes an equipment procurement strategy in which static capacity analysis is used to identify an initial equipment set with a low slack capacity variable on each tool group. Simulation analysis is then used to identify the critical tool groups that contribute to cycle time delays. The Seagate Industrial Engineering team used the simulation analysis tool Factory Explorer(R) from Wright, Williams and Kelly to perform the cycle time Reduction analysis. This targeted approach is compared to the traditional static capacity planning approach of globally applying reserve capacity buffers of 20% or more to achieve the same cycle time Reduction goal. Overall, the targeted approach has proven to be efficient in terms of minimizing capital equipment expenditures and also effective on the factory floor.
James P Ignizio - One of the best experts on this subject based on the ideXlab platform.
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cycle time Reduction via machine to operation qualification
International Journal of Production Research, 2009Co-Authors: James P IgnizioAbstract:In the utopian factory every machine in a workstation would be qualified to perform every operation supported by that workstation (e.g., able to run every associated photolithography layer of the semiconductor wafer fabrication process). In real world factories this is unlikely to be either practical or even feasible. As a consequence, one of the more vexing problems involved in determination of factory configuration and operation is that of deciding which operations are to be run on what machine, so as to optimise overall factory performance. In this paper the decision of the allocation of machine-to-operation qualifications in a semiconductor wafer fabrication photolithography workstation is employed to illustrate this problem. Factory performance, as achieved by both conventional and optimal means, is compared via simulations of a model of a semiconductor wafer fabrication facility. The improvement, in factory performance–and estimated cost savings–was found to be substantial.
Navdeep S Grewal - One of the best experts on this subject based on the ideXlab platform.
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integrating targeted cycle time Reduction into the capital planning process
Winter Simulation Conference, 1998Co-Authors: Navdeep S Grewal, Alvin C Bruska, Timbur M Wulf, Jennifer RobinsonAbstract:This paper describes the development and application of an integrated static capacity and dynamic simulation analysis methodology for purchasing equipment capacity. The goal of the study is to address targeted cycle time objectives in a start up recording head wafer manufacturing facility at Seagate Technology, Minneapolis, MN. The short product cycle time, coupled with the competitive nature of the disc drive industry, has made cycle time Reduction one of the most important objectives of production capacity planning. This paper describes an equipment procurement strategy in which static capacity analysis is used to identify an initial equipment set with a low slack capacity variable on each tool group. Simulation analysis is then used to identify the critical tool groups that contribute to cycle time delays. The Seagate Industrial Engineering team used the simulation analysis tool Factory Explorer(R) from Wright, Williams and Kelly to perform the cycle time Reduction analysis. This targeted approach is compared to the traditional static capacity planning approach of globally applying reserve capacity buffers of 20% or more to achieve the same cycle time Reduction goal. Overall, the targeted approach has proven to be efficient in terms of minimizing capital equipment expenditures and also effective on the factory floor.
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Winter Simulation Conference - Integrating targeted Cycle-Time Reduction into the capital planning process
1998 Winter Simulation Conference. Proceedings (Cat. No.98CH36274), 1Co-Authors: Navdeep S Grewal, Alvin C Bruska, Timbur M Wulf, Jennifer K. RobinsonAbstract:This paper describes the development and application of an integrated static capacity and dynamic simulation analysis methodology for purchasing equipment capacity. The goal of the study is to address targeted cycle time objectives in a start up recording head wafer manufacturing facility at Seagate Technology, Minneapolis, MN. The short product cycle time, coupled with the competitive nature of the disc drive industry, has made cycle time Reduction one of the most important objectives of production capacity planning. This paper describes an equipment procurement strategy in which static capacity analysis is used to identify an initial equipment set with a low slack capacity variable on each tool group. Simulation analysis is then used to identify the critical tool groups that contribute to cycle time delays. The Seagate Industrial Engineering team used the simulation analysis tool Factory Explorer(R) from Wright, Williams and Kelly to perform the cycle time Reduction analysis. This targeted approach is compared to the traditional static capacity planning approach of globally applying reserve capacity buffers of 20% or more to achieve the same cycle time Reduction goal. Overall, the targeted approach has proven to be efficient in terms of minimizing capital equipment expenditures and also effective on the factory floor.
