Abstract
In view of the fact that the endo-prosthesis heads of human hip-joint are operated in extreme conditions, in respect of load, the selection of corresponding material and also increase of precision and quality of machining of spherical surfaces is rather topical task. In the submitted work are reviewed the problems connected with definition of the influence degree of orientation of the sapphire crystal on its workability during diamond grinding with a butt of the ring and elaboration of the perspective, original scheme of formation of the incomplete spherical surface, particularly, of the sapphire head of endo-prosthesis of the human hip-joint.
Highlights
Endo-prosthetics is effective and often the only method of the function restoration of the human joint
The endo-prosthesis heads of the human hip-joint from the point of view of the character and value of load are operated in extreme conditions
In each specific case the selection of the necessary material with corresponding physicalmechanical characteristics and increasing of precision and quality of the most significant part of endoprosthesis – spherical surfaces is rather actual task the acuteness of which intensively grows in recent years
Summary
Endo-prosthetics is effective and often the only method of the function restoration of the human joint. The circle of materials for fabrication of pairs of bearing surfaces of endo-prostheses of joints with minimally possible number of products of wear has been determined. Such pairs of bearing surfaces with excellent characteristics of wear resistance are the friction pairs of ceramics-ceramics, metal-metal and polyethylene with a high degree of cross-section links in combination with ceramics or metal. The pressing is carried out by force P of the machined surfaces of parts to the work surface of the grinding ring.The experimental investigations were conducted on the laboratory setting equipped with the special precision head (Fig. 6b).
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