Technological Possibilities of Low-Temperature Precision Grinding Process when Machining Hard and Brittle Materials

Grindability of Single Crystal Sapphire in Medical Use and the Scheme of Forming Highly Precise Spherical Heads

“…In general the Low-Temperature Precision Grinding (LPG) belongs to the first group. However, it combines such features of abrasive machining the flat surfaces of hard and brittle materials as high productivity of conventional grinding, but the surface quality of ground specimens may attain the level of lapping process [2,3].…”

“…By studying the morphology of ground surface it has been proved the possibility of grinding single crystal sapphire and other brittle and hard materials [3,5] at ductile mode i.e. to deform removed layer by shear without cracking fracture at low cutting speeds (Fig.…”

“…The aim of the presented work is to study the influence of sapphire crystallographic plane orientation and the grinding regimes on the material removal rate, surface finish and the state of ground sub-surface layer with regard to the positive features of the Low-Temperature Precision Grinding (LPG) [3,4,5] and to elaborate schemes of forming the partial spherical heads of endoprosthesis for human hip joint based on the novelties in kinematics for the variety of wheel/work setups.…”

Improving the Performance Characteristics of Human Hip-Joint Implants by Increasing the Quality of Processing and Geometric Accuracy of Their Spherical Surfaces

“…The aim of the presented work is: to determine the degree of influence of the orientation of the sapphire crystal on its processing by grinding by the NSP method created at the Department of Mechanical Engineering Technology of the Georgian Technical University and the development of a promising, original scheme the shaping of an incomplete spherical surface, in particular, a sapphire head of a human hip joint endoprosthesis. A detailed description of the low-temperature grinding process (LGP) method, the kinematic diagram of the laboratory setup and the experimental technique can be found in previous publications [1,2,3,4].…”

Selection Criteria of Optimal Characteristic Material and Technologies for Precision Processing of Basic Working Surface of Human Hip-Joint Implant

“…Among them there is an insufficient biological inertness and redundant wear of components of the friction pair that lead to short duration of work of the artificial hip-joint. Besides that as the result of wear of the material in the friction pair of endo-prosthesis hinge toxic and oncological danger products of the dissociation in various organs and tissues accumulate that in 30-40% leads to hard complications and requires complex disabling interferences [1,2].…”