Study of machining indentations over the entire surface of a target ball using the force modulation approach

Abstract

A modified five-axis cutting system using a force control cutting strategy was to machine indentations in different annuli on the entire surface of a target ball. The relationship between the cutting depths and the applied load as well as the microsphere rotation speed were studied experimentally to reveal the micromachining mechanism. In particular, aligning the rotating center of the high precision spindle with the microsphere center is essential for guaranteeing the machining accuracy of indentations. The distance between adjacent indentations on the same annulus and the vertical distance between adjacent annuli were determined by the rotating speed of the micro-ball and the controllable movement of the high-precision stage, respectively. In order to verify the feasibility and effect of the proposed cutting strategy, indentations with constant and expected depths were conducted on the entire surface of a hollow thin-walled micro-ball with a diameter of 1 mm. The results imply that this machining methodology has the potential to provide the target ball with desired modulated defects for simulating the inertial confinement fusion implosion experiment.

Fabrication of Ordered Micro/Nanostructures Using Probe-Based Force-Controlled Micromachining System

“…Therefore, there is no need to carry out a strict process of levelingsample and adjusting-tool before processing. Particularly, for machining on inclined surface or micro-ball surface, in-process force-control micro-machining method shows a strong machining capability, and micro-pits and nanogrooves have been fabricated on the micro-ball surface successfully [30,31].…”

Fabrication of three-dimensional sin-shaped ripples using a multi-tip diamond tool based on the force modulation approach

“…Different from single-tip tool cutting, the most difficult problem is to align the MTD tool with the microsphere center for guaranteeing each tip in contact with microsphere surface during the cutting process. More importantly, it is essential to make the microsphere center coincide with the spindle rotation center, which is critical to the machining accuracy and implemented by the approach of optical capture software as described in the previous study [37]. Refer to Figure 6 of the forcedepth relationship in plane scratching, the normal force was applied to 25 mN for getting larger cutting depth.…”

In Situ Bipolar Doping via Mechanically Controlled Dipole Under Water

“…[ 19–21 ] This approach has its limitations, such as a high level of process complexity, the need for vacuum facilities, and extreme environmental control. [ 22,23 ] Additionally, the severity of the environmental issues that emerge during the doping and patterning processes reaches a non‐negligible level. This emphasizes the importance of reducing both the number of processes and chemical usage.…”