New plastic joining method using indentation of cold bar to hot forged part

Matsumoto, Ryo; Hanami, Shinji; Ogura, Atsushi; Yoshimura, Hyoji; Osakada, Kozo

doi:10.1016/j.cirp.2008.03.126

Cited by 34 publications

(14 citation statements)

References 3 publications

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“…Taniguchi et al successfully used press fitting to assemble constituent parts of a bimaterial gear [172]. Shrink fitting has also been employed in research to assemble bimaterial parts [173,174].…”

Section: Joining Processesmentioning

confidence: 99%

Negative Thermal Expansion Metamaterials: A Review of Design, Fabrication, and Applications

Dubey,

Mirhakimi,

Elbestawi

2024

JMMP

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Most materials conventionally found in nature expand with an increase in temperature. In actual systems and assemblies like precision instruments, this can cause thermal distortions which can be difficult to handle. Materials with a tendency to shrink with an increase in temperature can be used alongside conventional materials to restrict the overall dimensional change of structures. Such structures, also called negative-thermal-expansion materials, could be crucial in applications like electronics, biomedicine, aerospace components, etc., which undergo high changes in temperature. This can be achieved using mechanically engineered materials, also called negative thermal expansion (NTE) mechanical metamaterials. Mechanical metamaterials are mechanically architected materials with novel properties that are rare in naturally occurring materials. NTE metamaterials utilize their artificially engineered architecture to attain the rare property of negative thermal expansion. The emergence of additive manufacturing has enabled the feasible production of their intricate architectures. Industrial processes such as laser powder bed fusion and direct energy deposition, both utilized in metal additive manufacturing, have proven successful in creating complex structures like lattice formations and multimaterial components in the industrial sector, rendering them suitable for manufacturing NTE structures. Nevertheless, this review examines a range of fabrication methods, encompassing both additive and traditional techniques, and explores the diverse materials used in the process. Despite NTE metamaterials being a prominent field of research, a comprehensive review of these architected materials is missing in the literature. This article aims to bridge this gap by providing a state-of-the-art review of these metamaterials, encompassing their design, fabrication, and cutting-edge applications.

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Section: Joining Processesmentioning

confidence: 99%

Negative Thermal Expansion Metamaterials: A Review of Design, Fabrication, and Applications

Dubey,

Mirhakimi,

Elbestawi

2024

JMMP

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“…This combined with the use of a polygon profile in the hub, produced a component with twice the torsional strength compared to conventional thermal shrinkage. Matsumoto et al [95] utilised the indentation of a cold shaft into a hot disc, where the thermal shrinkage established a bond where 20% of the overall bond strength was due to mechanical clamping and 80% due to metallurgical bonding.…”

Section: Shrink Fittingmentioning

confidence: 99%

Review of recent developments in manufacturing lightweight multi-metal gears

Politis

Lin

2021

Prod. Eng. Res. Devel.

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This paper provides a review of recent developments in the manufacturing of lightweight multi-metal components, and in particular gears. The literature has shown that significant efforts have been made in manufacturing light gears and numerous technical challenges exist when designing for and manufacturing with dissimilar metals including challenges in heating technologies, mechanical performance, processing parameters, metal compatibility and the interface layer between adjacent materials, as well as difficulties in multi-metal simulations. Whilst the scope of multi-metal manufacturing is vast, the main concentration of this study is on the main stages of multi-metal gear production, and specifically on preform production, multi-metal heating, intermetallic bonding, and modelling of essential forming parameters. The effects of each of these methods as well as the numerous approaches studied in the literature are presented, with a recommendation being made as to a processing route that may lead to a robust multi-metal gear with minimal production line modifications to conventional steel gears.

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“…In the search for mechanical joints without the use of fasteners or rivets, the choice was for many years limited to those that produce a force-fit joint resulting from the residual normal stresses that are developed at the contact interfaces due to the elastic-plastic deformation of the sheets and rods caused by shrinkage of the sheets during cooling [1].…”

Section: Introductionmentioning

confidence: 99%

Hidden mechanical joints of sheets to rods by axial sheet bending and unbending

Afonso

Alves

2022

Int J Adv Manuf Technol

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Mechanical joints of sheets to rods by plastic deformation produced at room temperature away from the rod ends have been investigated in recent years but new developments are still needed. The process hereby presented relies in the axial bending of a sheet with a pre-drilled hole of smaller diameter than that of the rod, until the diameter of the sheet becomes equal to the initial diameter of the rod. Then, a rod is placed inside this larger hole diameter of the sheet and the sheet is unbent to its original shape, with its material being radially injected to a rectangular cross-section slot previously machined in the rod, thus producing a mechanical interlocking between the two geometries. The major process parameters are identified and their influence in the deformation mechanics is analysed by means of finite element modelling and experimentation. The experiments were carried out in unit cells while the numerical modelling analysed sheets of different lengths and thicknesses, so that to allow a proper understanding of the influence of different specifications on the new joining by forming process. Destructive performance tests were performed in the sheet-rod connections and comparisons with previous joining techniques were made to confirm the success of the new mechanical joint.

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New plastic joining method using indentation of cold bar to hot forged part

Cited by 34 publications

References 3 publications

Negative Thermal Expansion Metamaterials: A Review of Design, Fabrication, and Applications

Negative Thermal Expansion Metamaterials: A Review of Design, Fabrication, and Applications

Review of recent developments in manufacturing lightweight multi-metal gears

Hidden mechanical joints of sheets to rods by axial sheet bending and unbending

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