Analysis and Design for Rapid Prototyping Mechanism Using Hybrid Flexural Pivots

Correa, Jorge Enrique; Ferreira, Placid M.

doi:10.1016/j.promfg.2015.09.062

Cited by 5 publications

(5 citation statements)

References 3 publications

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“…For small and filigree additive manufactured components, LPBF is usually considered due to the freedom of design and short-lead times [27]. However, even this innovative technology has manufacturing constraints, such as the need for support structures or high build-up times.…”

Section: State-of-the-art Laser Metal Depositionmentioning

confidence: 99%

Pure Copper: Advanced Additive Manufacturing

Stepien¹,

Gruber²,

Greifzu³

et al. 2022

Advanced Additive Manufacturing

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This book chapter elaborates on different additive manufacturing (AM) processes of copper and copper alloys. The scope is to give the reader a basic understanding of the state-of-the-art of copper additive manufacturing by different AM technologies, such as laser powder bed fusion (LPBF), laser metal deposition (LMD), binder jetting (BJ), and metal-fused filament fabrication (M-FFF). Furthermore, we want the reader to be able to use this knowledge to find and assess potential use cases. Recently, with the commercial availability of green laser sources, the difficulties for laser processing of pure copper were overcome, which gave AM technologies, such as LPBF and LMD new momentum and increased interest. AM technologies involving a subsequent sintering step. They are relatively new and gained interest due to fast build-up rates (BJ) or ease of operation (M-FFF). We will cover important material-related properties of copper and its implications for manufacturing and application (e.g. absorption, sinterability, conductivity, and its dependency on impurities). Further, we address applications for AM copper, present the state-of-the-art for above mentioned AM technologies and share our own recent research in this field.

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Section: State-of-the-art Laser Metal Depositionmentioning

confidence: 99%

Pure Copper: Advanced Additive Manufacturing

Stepien¹,

Gruber²,

Greifzu³

et al. 2022

Advanced Additive Manufacturing

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“…The notch type flexural hinges generally have a small angle range (generally ±0.5°~±0.6°). However, tape-spring-type flexural hinges can achieve a much larger angle range [ 42 , 43 , 44 ]. For example, the cross axis flexural hinges of the Riverhawk company can achieve a ±30° angle range [ 45 ].…”

Section: Fsm Design and Implementationmentioning

confidence: 99%

Conceptual Design and Image Motion Compensation Rate Analysis of Two-Axis Fast Steering Mirror for Dynamic Scan and Stare Imaging System

Sun

Ding

Zhang

et al. 2021

Sensors

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In order to enable the aerial photoelectric equipment to realize wide-area reconnaissance and target surveillance at the same time, a dual-band dynamic scan and stare imaging system is proposed in this paper. The imaging system performs scanning and pointing through a two-axis gimbal, compensating the image motion caused by the aircraft and gimbal angular velocity and the aircraft liner velocity using two two-axis fast steering mirrors (FSMs). The composition and working principle of the dynamic scan and stare imaging system, the detailed scheme of the two-axis FSM and the image motion compensation (IMC) algorithm are introduced. Both the structure and the mirror of the FSM adopt aluminum alloys, and the flexible support structure is designed based on four cross-axis flexural hinges. The Root-Mean-Square (RMS) error of the mirror reaches 15.8 nm and the total weight of the FSM assembly is 510 g. The IMC rate equations of the two-axis FSM are established based on the coordinate transformation method. The effectiveness of the FSM and IMC algorithm is verified by the dynamic imaging test in the laboratory and flight test.

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“…), and nickel alloys (Inconel 718, etc.) [4,5]. In case of collapsible flexible hinges, carbon fiber-reinforced plastics (CFRP) or shape memory alloys (SMA) are also used to achieve a large angle of rotation (typically > 90°); however, these hinges are designed only for very few cycles (typ.…”

Section: Introductionmentioning

confidence: 99%

“…For small and filigree additive manufactured components, laser powder bed fusion (LPBF) is usually considered due to the freedom of design and short lead times [4]. However, even this innovative technology has manufacturing constraints, such as the need of support structures or high build-up times, which affect the cost efficiency as well as process stability.…”

Section: Introductionmentioning

confidence: 99%

Material Characterization of AISI 316L Flexure Pivot Bearings Fabricated by Additive Manufacturing

et al. 2019

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Recently, additive manufacturing (AM) by laser metal deposition (LMD) has become a key technology for fabricating highly complex parts without any support structures. Compared to the well-known powder bed fusion process, LMD enhances manufacturing possibilities to overcome AM-specific challenges such as process inherent porosity, minor build rates, and limited part size. Moreover, the advantages aforementioned combined with conventional machining enable novel manufacturing approaches in various fields of applications. Within this contribution, the additive manufacturing of filigree flexure pivots using 316L-Si by means of LMD with powder is presented. Frictionless flexure pivot bearings are used in space mechanisms that require high reliability, accuracy, and technical cleanliness. As a contribution to part qualification, the manufacturing process, powder material, and fabricated specimens were investigated in a comprehensive manner. Due to its major impact on the process, the chemical powder composition was characterized in detail by energy dispersive X-ray spectroscopy (EDX) and inductively coupled plasma optical emission spectrometry (ICP-OES). Moreover, a profound characterization of the powder morphology and flowability was carried out using scanning electron microscopy (SEM) and novel rheological investigation techniques. Furthermore, quantitative image analysis, mechanical testing, laser scanning microscopy, and 3D shape measurement of manufactured specimens were conducted. As a result, the gained knowledge was applied for the AM-specific redesign of the flexure pivot. Finally, a qualified flexure pivot has been manufactured in a hybrid manner to subsequently ensure its long-term durability in a lifetime test bench.

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Analysis and Design for Rapid Prototyping Mechanism Using Hybrid Flexural Pivots

Cited by 5 publications

References 3 publications

Pure Copper: Advanced Additive Manufacturing

Pure Copper: Advanced Additive Manufacturing

Conceptual Design and Image Motion Compensation Rate Analysis of Two-Axis Fast Steering Mirror for Dynamic Scan and Stare Imaging System

Material Characterization of AISI 316L Flexure Pivot Bearings Fabricated by Additive Manufacturing

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