Fast Pick and Place Stacking System for Thin, Limp and Inhomogeneous Fuel Cell Components

Bobka, Paul; Gabriel, Felix; Römer, Martin; Engbers, Thomas; Willgeroth, Markus; Dröder, Klaus

doi:10.1007/978-3-662-60417-5_39

Cited by 6 publications

(5 citation statements)

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“…31 shows the picking and releasing processes of the manipulator. In addition, optimising the stack assembly process, reducing the number of assembly steps, and reducing the complexity of the assembly system are also significant for improving the efficiency of automatic assembly [243][244][245][246][247].…”

Section: Automatic Assemblymentioning

confidence: 99%

Assembly techniques for proton exchange membrane fuel cell stack: A literature review

Song

Wang

Ding

et al. 2022

Renewable and Sustainable Energy Reviews

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Section: Automatic Assemblymentioning

confidence: 99%

Assembly techniques for proton exchange membrane fuel cell stack: A literature review

Song

Wang

Ding

et al. 2022

Renewable and Sustainable Energy Reviews

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“…The assembly of fuel cell stacks has only come into focus in recent years and thus is yet not discussed in literature deeply. In Bobka et al [3,4] a fuel cell stacking system is presented which features various cameras mounted overhead for position measurement before and after handling. For the assembly itself preassembled MEA's have been used, the investigations are focused on an improvement of stacking accuracy.…”

Section: State Of the Artmentioning

confidence: 99%

Optimized High Precision Stacking of Fuel Cell Components for Medium to Large Production Volumes

Schäfer

Fleischer

2022

Annals of Scientific Society for Assembly, Handling and Industrial Robotics 2021

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PEM fuel cells are well established in a number of niche markets. However, due to low production volume and manufacturer-specific designs, the assembly has been carried out manually most of the time. With new fields of application being exploited there is a rising demand for production systems. As there is no standardized design or material, production systems are often custom-made, thus being inflexible to design changes or different products. In combination with a volatile demand the need for flexible and scalable systems arises. In this paper special attention is paid onto pick and place operations of the catalyst coated membrane (CCM). Design criteria of a vacuum gripper are derived from the material properties. To meet the further requirements for a high position accuracy in an automated assembly the impact of process parameters onto the repeatability is investigated to identify optimization trends. The requirements and investigations lead to a conceptual assembly system that is able to cover several steps in fuel cell production.

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“…It must be able to adhere to a surface and prevent separation when supporting a specified load. Yet it is also desirable to be easily detached on demand, for example in pick‐and‐place applications where sensitive components [ 1,2 ] must be released without damage, or for wearable [ 3 ] and medical devices [ 4 ] that must be removed from skin without causing pain. Additionally, many of these applications involve adhesion to nonplanar surfaces that span large areas, implying that scalability is another requirement.…”

Section: Introductionmentioning

confidence: 99%

“…It must be able to adhere to a surface and prevent separation when supporting a specified load. Yet it is also desirable to be easily detached on demand, for example in pick-and-place applications where sensitive components [1,2] must be released without damage, or for wearable [3] Dewetting can occur during thermal annealing of a polymer film above its glass transition temperature (T g ) when there is a mismatch in the surface energies between the polymer film and the substrate (Figure 1a). [15,16] Specifically, the dewetting process occurs in the following sequence: 1) nucleation of holes in the liquid-like polymer film due to thermal undulations, 2) radial growth of these holes, 3) coalescence of holes to form ribbons of polymer, and 4) decay of the polymer ribbons into droplets.…”

Section: Introductionmentioning

confidence: 99%

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Self‐Assembled Asperities for Pressure‐Tunable Adhesion

et al. 2022

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and medical devices [4] that must be removed from skin without causing pain. Additionally, many of these applications involve adhesion to nonplanar surfaces that span large areas, implying that scalability is another requirement. Conventional pressure sensitive adhesives (PSAs) satisfy the first requirement. They can sustain large loads due to their ability to flow and establish conformal contact without significant applied pressure. [5] While PSAs require a relatively low threshold pressure for contact formation, there is little to no change in their adhesive response if the applied pressure is above this threshold. These materials are far from ideal as large deformations are required for interfacial separation and, if the adhesive fails cohesively, permanent damage of the interface will limit its reusability and contaminate the target substrate.Significant advances have been made in the development of new adhesive systems. Surface modification, such as patterning with microscopic wrinkles [6][7][8] or fibrillar posts, [9][10][11][12] have been demonstrated to enhance adhesion strength or release with some success. These materials are advantageous as they can be designed with stiffer and more elastic properties relative to PSAs, which can yield switchable [11,12] or even tunable adhesives. [8] However, these surface modification approaches remain limited either by scalability or the inability to be adapted to a diverse range of surface chemistries. A scalable and universal strategy, which enables the modification of any adhesive surface for pressure-tunable adhesion and easy release on a variety of substrate materials and geometries, has yet to be realized. Previously, [13] we presented a new and generalized approach to obtain a material with pressure-tunable adhesion. This new pressure-tunable adhesive (PTA) is a surface patterned material that utilizes polymer thin film dewetting. This phenomenon can be realized in a host of materials, which we leverage here to form selfassembled stiff asperities on an elastomeric substrate to control adhesion. In the present work, we study the adhesive properties of these materials and demonstrate the control of their pressure-tunable behavior by changing the size of the stiff asperities. As thin film dewetting can be designed to occur in various materials systems, we anticipate that our present strategy to generate a patterned adhesive can displace existing surface patterning approaches and be applied over large surface areas.Polymer thin film dewetting is an interfacial phenomenon associated with an energetically favorable breakdown of a polymer film into droplets due to an external thermodynamic driving force such as temperature or solvent annealing. [14] Control of adhesion is important in a host of applications including soft robotics, pick-and-place manufacturing, wearable devices, and transfer printing. While there are adhesive systems with discrete switchability between states of high and low adhesion, achieving continuously variable adhesion strength remains a challe...

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Fast Pick and Place Stacking System for Thin, Limp and Inhomogeneous Fuel Cell Components

Cited by 6 publications

References 0 publications

Assembly techniques for proton exchange membrane fuel cell stack: A literature review

Assembly techniques for proton exchange membrane fuel cell stack: A literature review

Optimized High Precision Stacking of Fuel Cell Components for Medium to Large Production Volumes

Self‐Assembled Asperities for Pressure‐Tunable Adhesion

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