Lapshin

pp. 48-71

The article describes a discontinuous process to machine flat aluminum alloy reflectors using a milling head equipped with a single-point diamond cutter. A developed technology allows machining the parts of optical surface quality. The article analyses the kinematic scheme and presents the model to calculate the cutting forces and temperatures. It also offers schemes to determine the cutting length when machining the flat reflector. The proposed model-based data have been compared with the experimental study data from various sources. The experimentation part represents the flat reflector machining results achieved owing to developed technology. The tests have confirmed the technology effectiveness. The ways to improve the quality of machining have been outlined.

In this paper the authors consider a process of finish turning of work pieces made of hardened steel with cutters equipped with tool materials based on boron nitride such as cubic boron nitride CBN10 (SECO) and Dense Boron Nitride (DBN). An analysis was conducted, and a method for calculating parameters of turning hardened steel work pieces was proposed; these parameters are forces, cutting temperature, wear rate, magnitude of wear, tool durability and parameters of chip formation. In the experimental part of this study the authors describe a technology of precision sharpening of cutting tools made of DBN; the quality of sharpening was estimated. Test results of the cutters during the process of turning of cylindrical and end face surfaces along with boring a hole in a work piece made of 9HS HRC 60 steel are presented in this work. Results of a quality estimation of the machined surfaces are also given. The conducted studies confirmed effectiveness of the use of cutters made of dense boron nitride for precision machining of hardened steel.

 The article describes the process of sharpening of precision cutting tools made of ultra-hard materials for ultra-precise cutter-grinding machines. These are the requirements to be met by the sharpened surface and by the means by which they are achieved. The authors present the results of their research of the quality of sharpened surfaces, and the results of tests of different cutters operations. 

The authors analyze properties of ultra-hard tool materials on the basis of boron nitride of various brands and manufacturers – both domestic and foreign. Recommendations on regime parameters of processing work pieces made of hardened steel were analyzed. Calculation dependences of tool life, cutting speed, forces and roughness of the processed surface are given. The authors present the results of their experimental research of cutting properties of various brands of tool materials on the basis of boron nitride when processing work pieces made of hardened steel. Directions for further investigations of tools made of modern materials on the basis of boron nitride were outlined.