A dynamic model for the optimization of rotatory feeding devices
TL;DR: A dynamic model is developed and validated, which describes the interaction of the components to be fed with the blades of a rotating feeding unit and an optimization method is proposed using a weighted cost function, which allows to define the shape of the blade according to a set of design objectives.
About: This article is published in Mechanism and Machine Theory.The article was published on 2021-12-01. It has received 3 citations till now. The article focuses on the topics: Takt time & Throughput (business).
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TL;DR: In this paper , an improvement of a rotary feeding device is proposed, where the movement of the rotary device is driven by a four-bar linkage mechanism which is designed through functional synthesis.
Abstract: Component batching can be a source of time waste in specific industrial applications, such as kitting. Kitting operations are usually performed by hoppers, but other devices can be used to optimize the process. In a previous work, a rotary device has been proved to be more efficient than hoppers; such a device allows the kitting and releasing of the components in a single rotatory movement, while traditional hoppers require at least two movements. In this paper, an improvement of such feeding device is proposed. The movement of the rotary device is driven by a four-bar linkage mechanism which is designed through functional synthesis. Thank to the four-bar linkage mechanism, the alternate motion of the rotary distributor is derived from the constant speed of the motor.
1 citations
TL;DR: In this paper, the traveling salesman problem (TSP) is applied to the production process by integrating a multi-clustering model, thus increasing its appeal to several applications.
Abstract: Nowadays, the demand for personalized goods is increasing, with small batches of customized products. Companies are asked to cope with this need to be more competitive; thus, it is crucial to optimally set up the production process to cope with the demand. Among the products composed of several parts, sales kits occupy a significant role. Sales kits are sets of different components, supplied as a single unit. Automation is usually used to reduce the unit direct production costs for assembled products, and this is especially true for kitting since it has minimum added value, compared to other technologies. The wide range of components leads to frequent reconfiguration of the feeding devices between different products, increasing the setup time. The aim of this work is to provide a model that minimizes the setup times of automatic kitting systems when working with a high variety of products. To reach this goal, we propose to apply the traveling salesman problem (TSP) to the production process by integrating a multi-clustering model, thus increasing its appeal to several applications. This method is applied both to simulations and to a real case study, and proves to be able to provide a good solution in a reasonable time.
06 Jan 2022-Proceedings Of The Institution Of Mechanical Engineers, Part E: Journal Of Process Mechanical Engineering
TL;DR: In this article , a mathematical model was developed that can predict the trend in conveying velocity in linear vibratory feeder in three distinct regimes, sliding, hopping and a combination of these two.
Abstract: Linear vibratory feeder is one of the most extensively used part feeding systems in a production line. The part motion on the feeder can be sliding or hopping or a combination of these two. Based on the dynamics of part motion this paper identifies three distinct regimes. A mathematical model was developed that can predict the trend in conveying velocity in these regimes. This model can provide the parts position as a function of time and has considered relative displacement between the part and the conveying surface. The simulation was validated by performing experiments for a range of vibration frequencies and amplitudes.
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01 Jan 1991
TL;DR: In this paper, the authors present a detailed analysis of high-speed automatic insertion and insertion of parts for high speed feeding and orienting of a Vibratory-Bowl feeder.
Abstract: INTRODUCTION Historical Development of the Assembly Process Choice of Assembly Method Social Effects of Automation References AUTOMATIC ASSEMBLY TRANSFER SYSTEMS Continuous Transfer Intermittent Transfer Indexing Mechanisms Operator-Paced Free-Transfer Machine References AUTOMATIC FEEDING AND ORIENTING - VIBRATORY FEEDERS Mechanics of Vibratory Conveying Effect of Frequency Effect of Track Acceleration Effect of Vibration Angle Effect of Track Angle Effect of Coefficient of Friction Estimating the Mean Conveying Velocity Load Sensitivity Solutions to Load Sensitivity Spiral Elevators Balanced Feeders Orientation of Parts Typical Orienting System Effect of Active Orienting Devices on Feed Rate Analysis of Orienting Systems Performance of an Orienting Device Natural Resting Aspects of Parts for Automatic Handling Analysis of a Typical Orienting System Out-of-Bowl Tooling References AUTOMATIC FEEDING AND ORIENTING - MECHANICAL FEEDERS Reciprocating-Tube Hopper Feeder Centerboard Hopper Feeder Reciprocating-Fork Hopper Feeder External Gate Hopper Feeder Rotary-Disk Feeder Centrifugal Hopper Feeder Stationary-Hook Hopper Feeder Bladed-Wheel Hopper Feeder Tumbling-Barrel Hopper Feeder Rotary-Centerboard Hopper Feeder Magnetic-Disk Feeder Elevating Hopper Feeder Magnetic Elevating Hopper Feeder Magazines References FEED TRACKS, ESCAPEMENTS, PARTS-PLACEMENT MECHANISMS, AND ROBOTS Gravity Feed Tracks Powered Feed Tracks Escapements Parts-Placing Mechanisms Assembly Robots References PERFORMANCE AND ECONOMICS OF ASSEMBLY SYSTEMS Indexing Machines Free-Transfer Machines Basis for Economic Comparisons of Automation Equipment Comparison of Indexing and Free-Transfer Machines Economics of Robot Assembly References DESIGN FOR MANUAL ASSEMBLY Introduction Where Design for Assembly Fits in the Design Process General Design Guidelines for Manual Assembly Development of a Systematic DFA Analysis Method DFA Index Classification System for Manual Handling Classification System for Manual Insertion and Fastening Effect of Part Symmetry on Handling Time Effect of Part Thickness and Size on Handling Time Effect of Weight on Handling Time Parts Requiring Two Hands for Manipulation Effects of Combinations of Factors Threaded Fasteners Effects of Holding Down Problems with Manual Assembly Time Standards Application of the DFA Method Further General Design Guidelines References PRODUCT DESIGN FOR HIGH-SPEED AUTOMATIC ASSEMBLY AND ROBOT ASSEMBLY Introduction Design of Parts for High-Speed Feeding and Orienting Example Additional Feeding Difficulties High-Speed Automatic Insertion Example Analysis of an Assembly General Rules for Product Design for Automation Design of Parts for Feeding and Orienting Summary of Design Rules for High-Speed Automatic Assembly Product Design for Robot Assembly References PRINTED-CIRCUIT-BOARD ASSEMBLY Introduction Terminology Assembly Process for PCBs SMD Technology Estimation of PCB Assembly Costs Worksheet and Database for PCB Assembly Cost Analysis PCB Assembly - Equations and Data for Total Operation Cost Glossary of Terms References FEASIBILITY STUDY FOR ASSEMBLY AUTOMATION Machine Design Factors to Reduce Machine Downtime Due to Defective Parts Feasibility Study References Problems Appendix A: Simple Method for the Determination of the Coefficient of Dynamic Friction The Method Analysis Precision of the Method Discussion Reference Appendix B: Out-of-Phase Vibratory Conveyors Out-of-Phase Conveying Practical Applications Reference Appendix C: Laboratory Experiments Performance of a Vibratory-Bowl Feeder Performance of a Horizontal-Delivery Gravity Feed Track Conclusions Appendix D: Feeding and Orienting Techniques for Small Parts Coding System Feeding and Orienting Techniques Orienting Devices for Vibratory-Bowl Feeders Nonvibratory Feeders Nomenclature Index
368 citations
TL;DR: In this paper, the trade-off between kitting and line stocking is discussed and a descriptive model which can be used to quantify the tradeoff in material handling, space requirements, and work-in-process is presented.
206 citations
TL;DR: In this paper, the authors introduce a mathematical cost model for evaluating the assignment of parts to one of two possible material supply systems: kitting or line stocking, and demonstrate that hybrid policies, where some parts will be kitted while others will be stocked in bulk at the line, are preferred to the exclusive use of either material delivery system.
Abstract: In a synchronous and fast-paced assembly line operation, it is crucial that the right parts are being supplied at the right time and at the right place. In automotive assembly, the need for efficient material handling part delivery is particularly great because of extensive product customisation and the lack of space to stock all the required parts at the assembly line. This paper introduces a mathematical cost model for evaluating the assignment of parts to one of two possible material supply systems: kitting or line stocking. Case data from an automotive company in Belgium is used to test the model. The results demonstrate that hybrid policies, where some parts will be kitted while others will be stocked in bulk at the line, are preferred to the exclusive use of either material delivery system. The factors influencing the preferred delivery method for individual parts are explored. Numerical results are presented.
134 citations
TL;DR: In this article, the authors examine each of the factors that should be considered when designing a generic flexible assembly system and present a novel generic flexible assembler design, which is capable of assembling a wide variety of products having an unknown specification.
Abstract: The development of a generic flexible assembly system involves the design, selection and integration of a number of different mechanical systems in order to develop an assembly system, which is capable of assembling a wide variety of products having an unknown specification. A specific system configuration being dependent on a variety of factors such as, product size, weight, component insertion direction, and manipulator geometry. This paper examines each of the factors that should be considered when designing a generic flexible assembly system and presents a novel generic flexible assembly system design.
53 citations
TL;DR: In this article, a dynamic analysis of the vibratory feeder is conducted theoretically and the obtained results are validated with experimental values corresponding to the various operating frequencies of the feeder unit.
29 citations