Microparts Feeding by a Saw-Tooth Surface

et al. 2012

JSDD

Self Cite

This study investigates the motion of micro-parts of different sizes on a symmetrically vibratory feeder system that consists of a saw-tooth surface made of carbide, brass, and zirconia. The velocity and position of micro-parts are time-dependently measured by the particle tracking velocimetry method. We investigate the micro-parts motion for a range of frequencies applied to the surface. The obtained results show that unidirectional motion can be attained by the present feeder system regardless of the surface material and the micro-part size. The motion behavior of micro-parts varies for different experiments and surfaces in spite of the same driving voltage and frequency. This implies that the motion of micro-parts is affected by uncertainties in the system. The micro-part motion consists of numerous frequencies, and the first frequency coincided with the exciting frequency. The results also show that the carbide saw-tooth surface produces the largest micro-part velocity among the three surface materials. Comparing relationship between feeding velocity and velocity spectrum clarifies that the micro-part moves faster when spectrum was clear. The experiments on the carbide surface indicate that the micro-part moves smoothly and a large velocity is observed within 50-70 Hz of driven frequency.

Section: Saw-tooth Surfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Study on the Motion of Micro-Parts on a Saw-Tooth Surface by the PTV Method

Dinh

et al. 2012

JSDD

Self Cite

“…We have developed a novel microparts feeder by using an asymmetric fabricated surface, such as a sawtoothed surface, as a feeder table (Figure 1) [2]. This asymmetric fabricated surface can feed along microparts in the desired direction using horizontal and symmetric vibrations because the microparts asymmetrically adhere to the asymmetric fabricated surface.…”

Section: Introductionmentioning

confidence: 99%

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

2013 IEEE/ASME International Conference on Advanced Intelligent Mechatronics

Matsuo

et al. 2013

Self Cite

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.

“…We have previously shown that a saw-toothed surface with simple planar and symmetric vibrations can be used to feed microparts ( Fig. 1) [1]. Because of the difference in the area of surface contact of a micropart with the sloping side of a tooth and with the other side, microparts adhere more strongly in one direction than in the other.…”

Section: Introductionmentioning

confidence: 99%

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

2008 IEEE International Conference on Automation Science and Engineering

Hirai

2008

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.