Modelling and control of a novel vibratory feeder

Du, Winncy Y.; Dickerson, Stephen L.

doi:10.1109/aim.1999.803220

Cited by 19 publications

(6 citation statements)

References 4 publications

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“…In order to move parts in the desired directions, nosinusoidal vibration are applied in some systems [6][7][8]. Asymmetric forces, generated by the differences between the static and sliding frictional conditions, can realize the target movement of parts.…”

Section: Related Workmentioning

confidence: 99%

Improvement of sawtooth shape generated by anisotropic etching process of single-crystal silicon for microparts feeding using horizontal and symmetric vibrations

Mitani

Matsuo

et al. 2013

2013 IEEE/ASME International Conference on Advanced Intelligent Mechatronics

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Etching process is a fabrication technology to generate a pattern on a single crystal silicon wafer. The etching process can generate stable and precise periodic pattern on the silicon wafer with a pitch of smaller than 100 µm order according to the etching mask on the surface and characteristics of surface plane orientation. Using a silicon wafer with a plain orientation of [221], an asymmetric periodic structure is generated on its surface because the etching speed is different between forward and backward of the crystal face. We previously showed that microparts can be fed along an asymmetric microfabricated surface using simple planar symmetric vibrations. Microparts move in one direction because they adhere to the microfabricated surface asymmetrically. We developed sawtoothed surfaces with an elevation angle of 20 deg and various pitches of from 10 to 100 micrometer on the surface of silicon wafer material using a dicing saw with a bevel type blade. Then we found fabrication errors and cracks on the top of teeth, and they caused contact probability among fed microparts and feeder surfaces, which affected the feeding stability of microparts. In the present work, we applied the asymmetry etched surface of the [221] oriented single crystal silicon wafer to develop higher accurate and uniform asymmetric fabricated surfaces. The section geometry, the tribology characteristics, and the feeding stability were evaluated among four types of the asymmetry etched silicon wafer pieces we developed in this work. We finally evaluated the stability of micropart feeding on each surface by the particle tracking velocimetry (PTV) method.

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Section: Related Workmentioning

confidence: 99%

Improvement of sawtooth shape generated by anisotropic etching process of single-crystal silicon for microparts feeding using horizontal and symmetric vibrations

Mitani

Matsuo

et al. 2013

2013 IEEE/ASME International Conference on Advanced Intelligent Mechatronics

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“…A parts feeding method that employs non-sinusoidal vibrations [6][7][8] has been developed. The part moves to Fig.…”

Section: Related Workmentioning

confidence: 99%

Analysis of contact between feeder surface and microparts based on measurements for microparts feeder using an asymmetric surface

Mitani

Hirai

2008

2008 IEEE International Conference on Automation Science and Engineering

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We previously showed that microparts can be fed along a saw-toothed surface using simple planar symmetric vibrations. Microparts move forward because they adhere to the saw-toothed surface asymmetrically. Using saw-toothed silicon wafers fabricated by a dicing saw applying bevel type blades, we evaluated the principle of unidirectional feeding of 2012type capacitors (size, 2.0 × 1.2 × 0.6 mm: weight, 7.5 mg) and 0603-type capacitors (size: 0.6 × 0.3 × 0.3 mm, weight: 0.3 mg), by analysing the contact between these feeder surfaces and a spherical model of convexities on the electrode surfaces of these capacitors. To extend these findings, we analysed the contact between capacitors and the saw-tooth surface using direct measurements. Surface profiles of the feeder surfaces and 0603-type capacitors were measured microscopically. Picture analysing software was applied to obtain a numerical model of these surface profiles. By processing the numerical model, we calculated a linear polynomial that approximated the surface profile. An adhesion model was examined by analysing the contact between these approximated models. Finally, using this adhesion model, we formulated a model for the driving force of microparts.

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“…It is quite common that the feeder must be taken off-line and retooled whenever the part or its orientation is changed, which is quite time -consuming [3]. In order to meet the requirements of agile manufacturing, the sensor-based vibratory feeders have been developed and can feed different parts in one feeder with the aid of machine vision [4][5][6][7]. However, the vibration angle and the frequency and waveform of the driving signal are fixed and can only be optimal ones to parts made of a certain material.…”

Section: Introductionmentioning

confidence: 99%

Fuzzy control of a decoupled vibratory feeding system

Han

2010

2010 Seventh International Conference on Fuzzy Systems and Knowledge Discovery

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This paper describes the development of a decoupled vibratory feeding system (DVFS), while the design and fuzzy control strategy are stressed. In DVFS, the vibration angle and the frequency and the waveform of the driving signals as well as the phase angle between the vertical vibration and horizontal vibration all can be easily adjusted, in software way, to suit agile manufacturing. The computer system and sensors form up a closed-loop digital control system and various control strategies can be easily applied to the feeding system to guarantee optimal feeding performance. A DVFS prototype has been successfully developed, on which experimental investigation is carried out with promising results acquired. Its mechatronic design and fuzzy control together with the experimental results are presented.

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Modelling and control of a novel vibratory feeder

Cited by 19 publications

References 4 publications

Improvement of sawtooth shape generated by anisotropic etching process of single-crystal silicon for microparts feeding using horizontal and symmetric vibrations

Improvement of sawtooth shape generated by anisotropic etching process of single-crystal silicon for microparts feeding using horizontal and symmetric vibrations

Analysis of contact between feeder surface and microparts based on measurements for microparts feeder using an asymmetric surface

Fuzzy control of a decoupled vibratory feeding system

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