Joining polymer parts with self-tapping screws: an improvement of the screw thread geometry

Cumbicus, Wilmer E.; Amestoy, Manuel Estrems; Arizmendi, M.; Jiménez, Amaia

doi:10.1007/s12289-020-01593-6

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…Figure 7.37. Torque and clamp load curves in the forming process using self-tapping screws (Cumbicus et al, 2021). Steps of inserting a heat-setting insert.…”

Section: List Of Figuresmentioning

confidence: 99%

“…Another method that relies on the same mechanical approach is the usage of self-tapping screws, as can be seen in Figure 7.36. Three phases could be identified in the joining using a self-tapping screw (Cumbicus et al, 2021): ( 1) Thread forming, (2) thread increase due to the advance of the screw, and ( 3) the union tightening between components. An additional (undesired) fourth phase would be the failure of the join.…”

Section: Threadingmentioning

confidence: 99%

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Analysis to Support Design for Additive Manufacturing with Desktop 3D Printing

Vicente¹

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“…Figure 7.37. Torque and clamp load curves in the forming process using self-tapping screws (Cumbicus et al, 2021). Steps of inserting a heat-setting insert.…”

Section: List Of Figuresmentioning

confidence: 99%

Section: Threadingmentioning

confidence: 99%

Analysis to Support Design for Additive Manufacturing with Desktop 3D Printing

Vicente¹

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Analysis of self-tapping screw joints in fibre glass reinforced PEI polymer used in the automotive industry

Cumbicus¹,

Amestoy²,

Arizmendi³

et al. 2023

Int J Adv Manuf Technol

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This article presents a study of the joining of polyetherimide (PEI) polymer parts reinforced with fibre glass which has great application in the automotive sector. A simulation model based on the finite element method is proposed. For the modelling of the polymeric material, the three-network viscoplastic (TNV) rheological model was used, with very adequate results and producing a good fit with the experimental data. In addition, a methodology is proposed that allows simplifying a three-dimensional to an axisymmetric model, which implies a notable reduction in computational cost. In addition, the work includes an experimental analysis that evaluates the tightening torque under conditions of assembly repetitiveness, relaxation over time and influence of thermal cycles. These scenarios have a different influence depending on the geometry of the self-tapping screw used. Regarding repetitiveness, it has been verified that PF-30 (CELOspArk®) loses 17.16% while in Δ-PT (DELTA PT®) it loses up to 41.93% in the tenth repetition. In contrast, in the relaxation over time scenario, the PF-30 loses 13.38% and the Δ-PT loses 17.82%. Finally, regarding the thermal cycles, cooling allows to slightly delay the loss of tightening torque in both screws in a similar way; however, in the heating stage, 36.89% is lost with PF-30 and only 14.66% with Δ-PT. This study represents an improvement in the knowledge of the joining processes of self-tapping screws with polymeric materials of an engineering nature. The simulation model can be easily adapted to other materials and other geometries, and the experimental study offers a vision of the evolution of tightening conditions in realistic operating scenarios.

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Material-specific design of direct screw connections for joining injection-moulded thermosets

Kramer,

Hopmann

2024

Proceedings of the Tim22 Physics Conference

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Joining polymer parts with self-tapping screws: an improvement of the screw thread geometry

Cited by 4 publications

References 20 publications

Analysis to Support Design for Additive Manufacturing with Desktop 3D Printing

Analysis to Support Design for Additive Manufacturing with Desktop 3D Printing

Analysis of self-tapping screw joints in fibre glass reinforced PEI polymer used in the automotive industry

Material-specific design of direct screw connections for joining injection-moulded thermosets

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