Dedicated optical instruments for ultrasonic welder inspection and control

Norgia, M.; Annoni, Massimiliano; Pesatori, Alessandro; Svelto, C.

doi:10.1016/j.measurement.2009.06.006

Cited by 9 publications

(8 citation statements)

References 11 publications

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“…Particular attention is paid to the repeatability of the experimental conditions during tests through a calibration of different quantities characterising the welding operation on the employed welder. Instantaneous vibration amplitude is measured in real time by a suitable laser triangulation system, developed by the authors in previous studies, 29 which is employed to calibrate its actual mean value at the tip of the sonotrode in function of the adimensional value set at the controller. The air pressure producing the clamping force is calibrated before the experiments according to manufacturer's instructions by means of a dedicated load cell.…”

Section: Experimentationmentioning

confidence: 99%

“…Finally, the vibration time is set at the welder controller and verified for all trials analysing the amplitude signal acquisitions, from which the starting and the ending instants of each welding operation is clearly detectable. 29 The mentioned calibration procedures make the experimentation repeatable on other welders.…”

Section: Experimentationmentioning

confidence: 99%

“…The air pressure producing the clamping force is calibrated before the experiments according to manufacturer's instructions by means of a dedicated load cell. Finally, the vibration time is set at the welder controller and verified for all trials analysing the amplitude signal acquisitions, from which the starting and the ending instants of each welding operation is clearly detectable 29. The mentioned calibration procedures make the experimentation repeatable on other welders.…”

Section: Experimentationmentioning

confidence: 99%

See 2 more Smart Citations

Ultrasonic metal welding of AA 6022‐T4 lap joints: Part I – Technological characterisation and static mechanical behaviour

Annoni

Carboni

2011

Science and Technology of Welding and Joining

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High power ultrasonic technology can currently count on a number of industrial applications. Ultrasonic welding, which is a standard joining technique in many applications on plastics, has few but well established metal applications, such as copper wires, pipes and connectors welding, or, considering spot welding of aluminium thin sheets, is attractive for the automotive industry field, where it could represent a possible cost effective alternative to resistance spot welding, clinching or self-pierce riveting. The present experimental study is addressed to this kind of application in order to evidence the effects of welding parameters and, most of all, their interactions on the tensile strength of tensile-shear spot welded lap joints. Relevant results have been achieved by dedicated and non-conventional instrumentations applied to the welder for measuring and controlling the process parameters. The best static performance has been taken as an input for the second part of the study regarding the fatigue behaviour and the joints failure modes.

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Section: Experimentationmentioning

confidence: 99%

Section: Experimentationmentioning

confidence: 99%

Section: Experimentationmentioning

confidence: 99%

See 1 more Smart Citation

Ultrasonic metal welding of AA 6022‐T4 lap joints: Part I – Technological characterisation and static mechanical behaviour

Annoni

Carboni

2011

Science and Technology of Welding and Joining

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“…A laser triangulation, with resolution and accuracy lower than 0.5 μm [17], is used to measure the wheel profile. Laser source is focalized on the wheel cylindrical surface placed at a distance of 30 mm, and signal is acquired at sampling frequency of 50 KHz.…”

Section: Direct Waviness Measurementmentioning

confidence: 99%

A model-based approach for online estimation of surface waviness in roll grinding

Parenti

Leonesio²,

Cassinari³

et al. 2015

Int J Adv Manuf Technol

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Vibrations onset represents a paramount issue in all grinding processes. The related surface defects appear in the form of micrometric waviness that decreases the finishing quality and in some cases the functionality of the ground workpieces: sometimes, these defects can be also marked on the grinding wheel surface. This paper presents an online model-based approach to identify and quantify the level of waviness starting from multiple acceleration measurements, allowing a continuous monitoring of wheel and/or workpiece defects. The identification algorithm, that exploits a linear model of machine and process dynamics, is based on the application of Least Squares method in the frequency domain. Experiments confirm the good performance of the algorithm that, hence, can be exploited for developing advanced control schemes of the grinding process

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“…This kind of distance measurement system is really versatile; indeed it is employed for a number of industrial and scientific applications, both for distance [1,7] and vibration [8] measurement. The working principle of the optical triangulator based instrument is described in Fig.…”

Section: Laser Sensing Techniquementioning

confidence: 99%

Laser Pitch-Detection for electric guitar

Norgia

Pesatori

2010

2010 IEEE Instrumentation &Amp; Measurement Technology Conference Proceedings

Self Cite

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This work describes the design and realization of a laser sensor dedicated to the measurement of the finger position on a musical instrument, like a guitar. The working principle of the sensor is optical triangulation: the system is realized by six lasers, multiplexed in time, and four Position Sensing Detectors. The speed and the accuracy of the proposed sensor well satisfy the application requirements.

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Dedicated optical instruments for ultrasonic welder inspection and control

Cited by 9 publications

References 11 publications

Ultrasonic metal welding of AA 6022‐T4 lap joints: Part I – Technological characterisation and static mechanical behaviour

Ultrasonic metal welding of AA 6022‐T4 lap joints: Part I – Technological characterisation and static mechanical behaviour

A model-based approach for online estimation of surface waviness in roll grinding

Laser Pitch-Detection for electric guitar

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