Within the framework of an uncoupled quasi-static problem of thermoelasticity, an analytical relationship is obtained, which is a criterion for the thermal strength of nonmetallic materials during pulsed laser annealing. The use of this ratio makes it possible to determine non-destructive modes of laser processing and calculate the required thermal strength of the processed materials, both existing and developed. An experimental verification of the adequacy of the computational model has been carried out. Il. 2, bibliography: 10 titles.
It is shown that to ensure the process of drilling holes in parts made of brittle non-metallic materials, the axial cutting force generated by a diamond drill must be greater than the critical cutting force corresponding to the threshold of brittle fracture of the material. A model for removing cuttings from the cutting zone has been developed, which ensures the operation of the drill in the self-sharpening mode. The recommended values ??of the pressure of the coolant supplied to the inner cavity of the drill, depending on its diameter, have been calculated. Il. 6, bibliography: 3 titles.
The design is considered and the results of the introduction into production of a circular grinding tool with a diameter of 600 mm based on a reusable body with a groove in diameter, in which elements pressed from a bond with a surface diamond-bearing layer are fixed, in the form of overlapping parallelepipeds and with a gap between the cutting layers of elements are presented. Il. 2, bibliography: 2 titles.
The analysis of the practical use of diamond-abrasive tools designed for fine grinding of flat surfaces of parts made of optical glass, sitall and ceramics, based on plate elements, making it possible to vary the filling factor of the annular zones and the entire faceplate. According to the results of comparative tests, the advantages of lamellar faceplates over patch plates are shown. Tab. 4, ill. 1, bibliography: 11 titles.
The performance of a diamond-abrasive annular tool based on lamellar elements and radially working patches used in production conditions for rough grinding and milling of the planes of optical glasses and other brittle materials is analyzed. Tab. 2, ill. 3, bibliography: 5 titles.
Within the framework of a quasi-static uncoupled problem of thermoelasticity, one-sided heating of a plate freely clamped along the contour by a volume source is considered. An analytical relationship is obtained, which is a criterion for the thermal strength of a plate, which makes it possible to determine non-destructive modes of laser processing, as well as the thermal strength of existing and developed materials. An experimental verification of the adequacy of the computational model has been carried out. Il. 2, bibliography: 11 titles.
The results of experimental studies on the choice of the optimal characteristics of diamond drills and modes of machining holes with a diameter of 1 - 70 mm in brittle solid non-metallic materials: quartz, ceramics, glass, glass, are presented. To obtain experimental-mathematical models at the screening stage, a randomized experimental design was used - a semi-replica from a full-factor experiment 23, and at the main stage - a second-order orthogonal compositional plan of type 35. The diamond drilling process was optimized using the simplex method. Comparison of the calculated values ??and experimental data showed a good adequacy of the results obtained. Tab. 4, ill. 2, bibliography: 2 titles.
A model of diamond drilling of holes in brittle solid nonmetallic materials is proposed, based on the description of the process of microcutting with a single grain and energy processes occurring during drilling. Modeling the work of a single grain was carried out taking into account the deformation of the bond. The simulation results are used in the form of specialized software for calculating cutting conditions and creating new progressive technologies for obtaining diamond tools operating under the most stressful conditions. Il. 5, bibliography: 5 titles.
