A unified element stiffness matrix model for variable cross-section flexure hinges in compliant mechanisms for micro/nano positioning

Tian, Yanling; Yang, Minghan; Wang, Fujun; Zhou, Chong; Zhao, Xingyu; Zhang, Dawei

doi:10.1007/s00542-019-04410-6

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…It can be applied in precision positioning, micro/nano measurement and plastic manufacturing. Several gains could be obtained by incorporating the integral hinge, such as the reduction of backlash, lubricants and friction [6]. Typical integral or living hinges require a specific flow direction so that the polymer chains will be oriented perpendicular to the hinge line.…”

Section: Integral Hingesmentioning

confidence: 99%

Injection Moulding Simulation: The Development of Integral Hinges Test Samples Mould Design via Cadmould 3D-F

Othman

2020

JAMEA

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Injection moulding process ability’s in producing intricate parts such as component with integral hinges, had been established for decades. However, to produce a good product, a niche verification process called simulation need to be performed first. Hence, this research was conducted for the development an integral hinges test samples mould design via injection moulding simulation. The simulation output was used to analyse the injection moulding parameter setting and defects towards the prepared mould design. The runner size and shape was fixed, same as well for the gate location and number of cavities. The test sample that needed to be developed was a sample with an integral hinge at the middle of the injected mould article. Polypropylene PPC 8780 (Total Petrochemical) was selected as the reference material. The research methodology started from using SolidWorks as the solid modelling-computer aided design software to prepare the design. This design was then converted into the stereolithography (STL) format. Cadmould 3D-F injection moulding simulation software was chosen as the computed added engineering analysis tools. Parameters such as temperature and time was monitored. The defects such as sink marks, volumetric shrinkage, warpage, weld lines, and air traps were observed. The results show that the mould design had produced 232°C temperature and 0.179 s time when the molten polymer was completely filled. It also produced several defects such as 0.882 % of volume shrinkage and 0.025 mm of warpage. Some sink marks occurred at the above part of the hinge, with 1 weld line and 9 air traps were also detected after the simulation completes. The conclusion of this finding is, the simulation could assist the mould designer to prepare necessary countermeasures in the actual process, and to prepare a better mould with minimum alteration/repair and accelerating setup/preparation time. Hence, the time and cost of a mould could be reduced, especially for new mould design for integral hinge products.

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Section: Integral Hingesmentioning

confidence: 99%

Injection Moulding Simulation: The Development of Integral Hinges Test Samples Mould Design via Cadmould 3D-F

Othman

2020

JAMEA

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“…PZT actuators have been widely used as fine-positioning-devices because of their advantages such as high positioning resolution, high generative force, high response speed and easy miniaturization (Fantoni et al , 2018; Wang et al , 2018; Chen et al , 2019; Jian et al , 2019). Therefore, many studies have been conducted on the design and manufacture of precision-positioning stages using flexure hinges and PZT actuators (Park et al , 2007; Jung and Kim, 2014; Clark et al , 2015; Qin et al , 2019; Tian et al , 2019; Zhang et al , 2020).…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a piezoelectrically driven micropositioning 3-DOF stage with elastic body using a multi-material 3D printer

Baek

Cho

Lee

2020

RPJ

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Purpose This paper aims to propose a method for manufacturing multi-material monolithic structures with flexible materials to construct the elastic body by using a dual-nozzle three-dimensional printer to develop a piezoelectric (PZT)-driven micropositioning stage with three degrees of freedom (3-DOF) and flexure hinges. Design/methodology/approach Polylactic acid (PLA) and nylon were used for the lever structure’s frame and flexure hinge, respectively. Additionally, the stage consisted of three PZT actuators for fine movement in the nanometer scale in 3-DOF (x, y and θ-directions). For the design of the stage, the kinematic analysis model and the finite element method (FEM) analysis was undertaken for comparing between PLA with nylon (multi-material), PLA (single material) and aluminum (conventional-material). In addition, two verification experiments were implemented for the fabricated prototype stage. First, to evaluate various assessments (lever ratio, hysteresis, coupling error and resolution), a measurement is carried out using the three capacitive sensors. Then, a two-camera-vision measurement experiment was performed to verify the displacement and lever ratio over the full-scale working range of the fabricated positioning stage, and the results from the experimentation and the FEM analysis were compared. Findings The authors confirmed enhancements in the properties of the lever structure frame, which requires stiffness and of the hinge, which requires flexibility for elastic deformation. Comparing FEM analysis and experimental results, although the performance as shown by experimental results was lower: the maximum difference being 3.4% within the end-point working range; this difference was sufficient to be a plausible alternative for the aluminum-based stage. Originality/value Multi-material monolithic-structure fabrication has an effective advantage in improving the performance of the stage, by using a combination of materials capable of reinforcing the desired characteristics in the necessary parts. It was verified that the fabricated stage can substitute the aluminum-based stage and can achieve a higher performance than single-material stages. Thus, precise-positioning stages can be manufactured in many kinds of structures with various properties and contribute to weight reduction and low costs for application equipment.

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A new structure to achieve large-scale damage-avoiding capture based on compliant mechanism

Chen

2020

Microsyst Technol

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A unified element stiffness matrix model for variable cross-section flexure hinges in compliant mechanisms for micro/nano positioning

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 5 publications

References 23 publications

Injection Moulding Simulation: The Development of Integral Hinges Test Samples Mould Design via Cadmould 3D-F

Injection Moulding Simulation: The Development of Integral Hinges Test Samples Mould Design via Cadmould 3D-F

Fabrication of a piezoelectrically driven micropositioning 3-DOF stage with elastic body using a multi-material 3D printer

A new structure to achieve large-scale damage-avoiding capture based on compliant mechanism

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