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Detailed design of assembly stations
Published in Michel Baudin, Lean Assembly, 2020
Common hand tools used in assembly include the following: Pneumatic or electric screwdrivers and nut runners.Wrenches and torque wrenches.Fluid dispensers: cleanser, adhesive, sealant, or flux.Soldering irons.Pliers and crimping tools.Cotton swabs and brushes.Mallets and hammers.
Interconnection technology
Published in Stephen Sangwine, Electronic Components and Technology, 2018
A fifth jointing technique used in electronics (and much more extensively in electrical engineering for heavier currents) is crimping. A crimped connection is made by crushing a special terminal onto a wire of the correct size using a purpose-made tool. The wire is gripped mechanically by the crushed terminal. Electrical contact depends on the mechanical integrity of the joint. Unlike a wire-wrapped or soldered joint, the electrical connection is not gas tight and can therefore be prone to corrosion. Crimping is an especially useful technique for jointing unsolderable wires such as aluminium, and for rapid wiring assembly in production.
Mechanical Joining Processes
Published in R. Ganesh Narayanan, Jay S. Gunasekera, Sustainable Material Forming and Joining, 2019
V. Satheeshkumar, R. Ganesh Narayanan
Mechanical crimping and hydraulic crimping are the two different methods available. Mechanical crimping is used to fabricate form-fit or interference-fit joint using segmented tools called crimping dies. In the crimping process, the tube is plastically deformed to fill a groove, which is machined/contained on a solid cylinder. In the case of hydraulic crimping process, forming pressure is applied on an elastomer, which in turn causes plastic deformation of the outer tubular part causing an interference-fit (Shirgaokar et al., 2004; Mori et al., 2013).
Application of nanotechnology in anaerobic digestion for biohydrogen production improvement from natural coagulation/flocculation sludge using metallic oxide nanoparticles
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2022
Raouf Bouchareb, Kerroum Derbal, Yasin Ozay, Chahrazed Niboucha, Maroua Bouti, Esma Mahfouf Bouchareb, Nadir Dizge
Coagulation sludge (as substrate) was inoculated and digested in closed digesters. Glass bottles of 100 mL of capacity with a working volume of 67 mL and a headcap volume of 33 mL were used as reactors. The substrate was inoculated separately with six different inoculum-substrate ratios (I/S): 1/2, 1/3, 1/4, 1/5 and 1/6 (based on TVS content). The calculation of the volumes of each of the components used in the reactors is shown in Table 3. The reactors were then closed with a rubber cap and sealed by aluminum heads using crimping pliers. Reactors with the same amount of inoculum and distilled water were used as blank samples. All reactors were placed in an incubator at 55°C (Bouchareb et al. 2021). The volume of biohydrogen produced is taken every 24 hours. The results of daily hydrogen production are shown in Figure 9.
Analysis of UOE forming process accounting for Bauschinger effect and welding
Published in Materials and Manufacturing Processes, 2020
Vishnu Madhav, Hariharan Krishnaswamy, Shrabani Majumdar
Elements A and B lies opposite to the weld location on the inner and outer side of the pipe, respectively. The elements are free from deformation during crimping. However, when the crimping die is retracted, bending due to self-weight induces minor stresses. During U-forming, the inner side of the pipe (element A) is subjected to compression whereas the outer (element B) is subjected to tension due to bending. As the rollers move-in to control the shape of the U-formed plate, stress re-distributes locally leading to stress reversals. The springback following the U-stage further reduces the magnitude of the induced forming stresses in the element. However, the plastic deformation and the constrained pipe results in locked-in residual stresses. It has already been observed from Fig. 7 that the central region of the plate undergoes most of its deformation during U-forming and doesn’t undergo any significant bending during O-forming. This can also be verified from the fact the elements A and B are subjected to elastic stresses during the O-forming stage. The elastic stresses in elements A and B are not relieved as the pipe continues to remain loaded by the dies. Compression in the inner section during O-forming stage, as reported in some cases[5,15] is not observed in the present study. This could possibly be due to the geometric configuration chosen in the present study.
Characterization of fabric properties knitted from multifilament polyester textured yarns with various number of filaments
Published in The Journal of The Textile Institute, 2019
Sina Saeedi Asl, Nazanin Ezazshahabi, Mohammadreza Mohaddes Mojtahedi
Concerning the impact of single filament concentration on the formation of the studied yarns, as it is shown in Figure 5, it was observed that with the growth in the quantity of filaments, the breaking strain of the resultant multifilament yarns reduced. It has to be considered that the constituent filaments of the yarns were in the texturized form. Therefore, they had an amount of crimp along their length and a portion of the exerted elongation went for the de-crimping of these single filaments. In case the number of filaments in the multifilament yarn structure rises, the contact between them and also the entanglement of the crimped filaments increases. In other words, the filaments become more engaged with each other in the yarn, and thus the resistance against de-crimping and their alignment along the yarn’s axis increases and the tensile strain of the yarn declines.