Laser bending of pre-stressed thin-walled nickel micro-tubes

Jamil, Muhammad; Fauzi, E.R. Imam; Juinn, C.S.; Sheikh, M. A.

doi:10.1016/j.optlastec.2015.04.012

Cited by 20 publications

(10 citation statements)

References 19 publications

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“…However, strategies to assist or to conduct forming, processed by laser radiation [92], are known, since more than 20 years, and several research results on micro-sheet forming have been already presented, e.g., in [93]. Current investigations into the laser-assisted forming of micro-tubular parts were conducted (a) to generate shape elements on tubular components by applying superimposed external or internal loads to the effect of laser heating [94,95], and (b) for the bending of micro-tubes, solely due to the laser impact [96][97][98].…”

Section: Laser-assisted Forming Of Micro-tubular Componentsmentioning

confidence: 99%

“…A self-learning algorithm was proposed and tested within the frame of this research, which determined for each bending step the most suitable values of the main parameters: the axial laser spot position on the tube and the laser power [97]. Studies in the laser-assisted bending of micro-tubes made from nickel, with an outer diameter of 960 µm and a wall thickness of 50 µm, were described in [98]. A particular result of this research was that the introduction of compressive pre-stresses by mechanical bending increased the final laser bending.…”

Section: Laser-assisted Forming Of Micro-tubular Componentsmentioning

confidence: 99%

“…A particular result of this research was that the introduction of compressive pre-stresses by mechanical bending increased the final laser bending. Different laser sources were tested, and the influence of the laser power, pulse length, and pre-stress constraint on the bending deflection was investigated [98]. A high laser power and short pulse duration were found to be preferable due to the high thermal conductivity of the selected tube material [98].…”

Section: Laser-assisted Forming Of Micro-tubular Componentsmentioning

confidence: 99%

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Review on Advances in Metal Micro-Tube Forming

Hartl

2019

Metals

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Metallic tubular micro-components play an important role in a broad range of products, from industrial microsystem technology, such as medical engineering, electronics and optoelectronics, to sensor technology or microfluidics. The demand for such components is increasing, and forming processes can present a number of advantages for industrial manufacturing. These include, for example, a high productivity, enhanced shaping possibilities, applicability of a wide spectrum of materials and the possibility to produce parts with a high stiffness and strength. However, certain difficulties arise as a result of scaling down conventional tube forming processes to the microscale. These include not only the influence of the known size effects on material and friction behavior, but also constraints in the feasible miniaturization of forming tools. Extensive research work has been conducted over the past few years on micro-tube forming techniques, which deal with the development of novel and optimized processes, to counteract these restrictions. This paper reviews the relevant advances in micro-tube fabrication and shaping. A particular focus is enhancement in forming possibilities, accuracy and obtained component characteristics, presented in the reviewed research work. Furthermore, achievements in severe plastic deformation for micro-tube generation and in micro-tube testing methods are discussed.

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Section: Laser-assisted Forming Of Micro-tubular Componentsmentioning

confidence: 99%

Section: Laser-assisted Forming Of Micro-tubular Componentsmentioning

confidence: 99%

Section: Laser-assisted Forming Of Micro-tubular Componentsmentioning

confidence: 99%

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Review on Advances in Metal Micro-Tube Forming

Hartl

2019

Metals

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“…Jamil et al [7] recently studied the bending of nickel micro tubes with an outer diameter of 1 mm and a wall thickness of 50 μm, Fig. 1 Sketch of how multiple fibers can be aligned to a PIC using tube bending using a high-power diode laser.…”

Section: Introductionmentioning

confidence: 99%

High precision optical fiber alignment using tube laser bending

Folkersma

Römer

Brouwer

et al. 2015

Int J Adv Manuf Technol

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In this paper, we present a method to align optical fibers within 0.2 μm of the optimal position, using tube laser bending and in situ measuring of the coupling efficiency. For near-UV wavelengths, passive alignment of the fibers with respect to the waveguides on photonic integrated circuit chips does not suffice. In prior research, it was shown that permanent position adjustments to an optical fiber by tube laser bending meets the accuracy requirements for this application. This iterative alignment can be done after any assembly steps. A method was developed previously that selects the optimal laser power and laser spot position on the tube, to minimize the number of iterations required to reach the target position. In this paper, that method is extended to the case where the absolute position of the fiber tip cannot be measured. By exploiting the thermal expansion motion at a relatively low laser power, the fiber tip can be moved without permanent deformation (only elastic strain) of the tube. An algorithm has been developed to search for the optimal fiber position, by actively measuring and maximizing the coupling efficiency. This search is performed before each bending step. Experiments have shown that it is possible to align the fiber with an accuracy of 0.2 μm using this approach.

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“…This technique is usually employed in multiple steps, either to increase the deformation magnitude, or to converge to a desired deformation with small steps. Laser forming has been used for many macro [12][13][14][15] and micro [16][17][18][19][20][21] applications, ranging from from the forming of ship hulls [12] or correcting the shape of car body parts [15] to the aligning of components during fabrication of tape-recorders [18] or correcting the reed contact gap width in micro relays [21].…”

Section: Laser Formingmentioning

confidence: 99%

Laser forming for sub-micron adjustment: with application to optical fiber assembly

Folkersma¹

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Laser bending of pre-stressed thin-walled nickel micro-tubes

Cited by 20 publications

References 19 publications

Review on Advances in Metal Micro-Tube Forming

Review on Advances in Metal Micro-Tube Forming

High precision optical fiber alignment using tube laser bending

Laser forming for sub-micron adjustment: with application to optical fiber assembly

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