By Pierre Lambert
Capillary Forces in MicroassemblyВ discusses using capillary forces as a gripping precept in microscale meeting. basically written and well-organized, this article brings togetherВ physical conceptsВ at the microscale with sensible purposes in micromanipulation. all through this paintings, the reader will discover a evaluation of the prevailing gripping rules, components to version capillary forces in addition to descriptions of theВ simulation and experimental try benchВ developed to review the layout parameters. utilizing famous techniques from floor technological know-how (such as floor stress, capillary results, wettability, and call angles) as inputs to mechanical versions, the quantity of attempt required to deal with micro-componentsВ isВ predicted. those advancements areВ then appliedВ in a case studyВ concerningВ the choose and position of ballsВ in aВ watch ball bearing.
Researchers and engineers serious about micromanipulation and precision meeting will locate this a hugely invaluable reference forВ microassembly process layout and analysis.
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Extra resources for Capillary Forces in Microassembly: Modeling, Simulation, Experiments, and Case Study
42 6 First Set of Parameters Fig. 1. Illustration of the attraction default The surface tension is denoted by γ and its numerical value depends on the molecular interactions: In most oils, the molecular interaction is van der Waals interaction, leading to quite low surface tensions (γ ≈ 20 mN m−1 ). As far as water is concerned, because of the hydrogen bonding, the molecular attraction is larger (γ ≈ 72 mN m−1 ). Typical values for conventional liquid range from 20 (silicone oil) to 72 mN m−1 (water at 20◦ C).
4. ) the gripper can be used to pick up microcomponents. Such tools are widespread in industry and an example of vacuum gripping tool can be found in . It consists in a glass pipette and a computer-controlled vacuum supply. Because of the adhesion forces, pick operation and place operation have antagonist demands: The ﬁrst one requires a large tip diameter while the latter needs a small one. Thus, for each size of component, there is an optimal diameter for the pipette tip. For instance, when handling a 80–150 µm sized object, the best results were obtained with a tip size ranging from 25 to 50 µm, which is about 25–50% of the object size.
The electrostatic gripper , including the electrostatic levitation [52, 53, 56, 58, 83, 171]. A ﬁrst example of a micromanipulation task driven by the electrostatic eﬀect is presented in  and depicted in Fig. 6. The authors proposed to use the electrostatic force in order to handle (=catch, move, release) a spherical particle near a substrate plate. All the objects (gripper, sphere, and substrate) are conductive. The principle in this case is to use the adhesion force to perform the gripping task and to impose a detachment voltage for release.
Capillary Forces in Microassembly: Modeling, Simulation, Experiments, and Case Study by Pierre Lambert