Advanced materials like AlTiC, sapphire and SiC are now commonly used in many devices. One popular area that they are applied in is read/write head sliders for computer hard drives. A major practical problem with the use of these materials is that they are extremely difficult to machine, and the advanced applications they are used in require precise tolerances for finished dimensions.
The small components are cut from larger wafers of material using systems that have constant feed speeds. However performance of the dicing blades degrades over time due to the deterioration of their surface conditions, i.e., dislodgment or dullness of abrasive grains, deformations and abrasion of the matrix material. This alters the grindability or cutting performance of the blades. A better understanding of the mechanisms governing grindability could be applied to producing better components machined from very hard materials.
A team of Japanese researchers, Takuya Adachi, Koji Matsumaru and Kozo Ishizaki, from Nagaoka University of Technology have developed a constant feeding-force system, which enables the grindability of a grinding wheel to be analysed. Under constant feeding-force system, the feeding speed alters during processing, which depends on the surface conditions of a grinding wheel, and indicates its grindability.
In this study, the theoretical grindability of dicing blades was estimated by establishing a new model for feeding speeds under constant feeding-force dicing systems. The model was evaluated by comparing empirical and theoretical dicing speeds for different abrasive grain sizes. The researchers were able to conclude that the grindability of dicing blades depends on the abrasive grains size, number and distribution on the surface of the dicing blade.
Dr. Ian Birkby | EurekAlert!
Electron tomography technique leads to 3-D reconstructions at the nanoscale
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24.05.2018 | Vanderbilt University
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
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There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
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