By Pierre Lambert
Capillary Forces in MicroassemblyВ discusses using capillary forces as a gripping precept in microscale meeting. in actual fact written and well-organized, this article brings togetherВ physical conceptsВ at the microscale with functional purposes in micromanipulation. all through this paintings, the reader will discover a assessment of the present gripping ideas, parts to version capillary forces in addition to descriptions of theВ simulation and experimental try out benchВ developed to check the layout parameters. utilizing famous suggestions from floor technology (such as floor pressure, capillary results, wettability, and speak to angles) as inputs to mechanical versions, the volume of attempt required to deal with micro-componentsВ isВ predicted. those advancements areВ then appliedВ in a case studyВ concerningВ the decide and position of ballsВ in aВ watch ball bearing.
Researchers and engineers concerned about micromanipulation and precision meeting will locate this a hugely important reference forВ microassembly process layout and analysis.
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Extra info for Capillary Forces in Microassembly: Modeling, Simulation, Experiments, and Case Study
A distinction can be made between the following: (a) Electrostatic. Static electrical ﬁelds can be used to levitate uncharged small particles by induced polarization of the sample. This technique is suitable only for polar liquids and low temperature ﬁelds. At high temperature the static charges are not maintained and gradually degenerating over time. On the other hand relatively large particles can be levitated [56, 92]. (b) Electrodynamic. The particles are charged and held stationary using a combination of static (DC) and oscillating (AC) electric ﬁelds.
Let us now enumerate the most common principles: 1. The friction based gripping using miniaturized tweezers [2, 102] (this is probably the most widespread gripper in industry, together with the vacuum gripper presented in what follows); to illustrate the mechanical gripper based on the tweezers principle, we present a microgripper with two ﬁngers actuated by piezoelectric bimorphs (Fig. 2). The whole gripper is packaged like an electronic chip. This is an example of “plug and use” concept developed by the LAB (Laboratoire d’Automatique de Besan¸con, ).
6. 5 Conclusions 31 Applications 13 Optical 12 10 11 8 9 Crystals manipulation  Handling of components with only one accessible surface Ball placement for a watch ball bearing Cryogenic Clamp before machining Bernoulli Food handling  Semiconductor devices handling [18, 123] Air cushion Microparts transfer system  Stand. 5 mm diameter balls  Water, ice, sugar, quartz  8 in. 7. 5 Conclusions 33 Electrostatic forces are probably a good candidate to develop microhandling tools, but we decided to put them aside because of the electromagnetic perturbations they induced on microcomponents, which often include electronics.