26 / 31
Page 94
April 16-17, 2018 Las Vegas, Nevada, USA
2
nd
Edition of
Graphene & Semiconductors | Diamond Graphite & Carbon Materials Conference
6
th
Edition of
Smart Materials & Structures Conference
&
Journal of Material Sciences and Engineering| ISSN: 2169-0022 | GDCSM-2018 | Volume: 7
Cutting and extruding processing technology for ceramics based on edge-chipping effect
Long Wang
Academy of Armored Forces Engineering, China
E
dge-chipping referred to the fact that the edges of hard, brittle materials are easily broken during processing. This problem has
brought many difficulties to their quality control. In fact, it was that the machining process itself destroyed materials, even though
it could be controlled. Based on this principle, a new machining technology based on crack propagation driven by edge-chipping
effect was proposed here. Multiple flanges caused by the cutting could increase the number of edges. Additionally, the fracture defects
were prefabricated on the surface of flanges. When the turning tool made of cemented carbide came into contact with the surface
of the ceramics, under the intermittent impact. The fractures were generated on the sides of flanges contacted with the tool and the
prefabricated micro cracks were expanded rapidly under this three-dimensional stress field applied externally by the tool. In addition,
due to the stress release toward the free surface, the cracks would expand to the surfaces of newly generated edges and the chips would
be broken off continuously, resulting in irregular edge-chipping and removal of material pieces. Furthermore, based on the spatial
distribution of grayscale images, the surface quality after rough processing under the different conditions was reasonably reflected
with the grayscale co-occurrence matrix (GLCM). With the new processing technology, these cracks became advantageous under
specific conditions. Therefore, the high external energy and ultra-hard tools required for the traditional processing technologies
could be significantly reduced, and the ceramics could be removed with less energy consumption and the tools with the hardness of
lower than its own one. Therefore, it not only could reduce the processing costs, but also could promote the extensive applications of
engineering ceramic materials.
waloxs@163.comJ Material Sci Eng 2018, Volume: 7
DOI: 10.4172/2169-0022-C3-098