The study of wear products (sludge) formed during fine diamond-abrasive polishing of ruby ??showed that the size of the particles that broke off from the treated surface significantly depend on the properties of the surface-active components of the polishing composition. The results obtained must be taken into account when developing polishing compositions that provide an increase in the productivity of fine abrasive processing and an improvement in the surface quality of products.
Within the framework of a quasi-static uncoupled problem of thermoelasticity, one-sided heating of a glass or ceramic plate freely clamped along the contour by a surface source is considered. An analytical relationship, which is a criterion for the thermal strength of a plate for the case of a linear dependence of Young's modulus and the temperature coefficient of linear expansion of the plate material on temperature, is refined. Il. 1, bibliography: 8 titles.
It has been established that for preliminary diamond grinding of high-quality and artistic glass with subsequent chemical polishing, it is advisable to use an organic binder MB 1 with diamond powder with a grain size of 90/70 microns and a concentration of 150%.
The use of the MB1 organic bond for wheels with diamond grinding powder with a grain size of 90/75 microns and a concentration of 150% instead of the bond M2-01 with a diamond powder grain size of 53/45 microns and a concentration of 50% made it possible to increase the productivity of preliminary diamond grinding of high-quality and art glass with subsequent chemical polishing by 20 - 25% and increase the durability of the wheel by 1.8-2.3 times at the same cost price of the wheels and the same roughness of the processed surface. Il. 4, bibliography: 4 titles.
The tendencies of further expansion of the field of application of tools with ceramic cutting inserts in modern metalworking are shown. A developed algorithm for controlling the performance of ceramic cutting inserts, focused on the creation of inserts for given operating conditions, is presented. Providing this algorithm with new methods and technologies will increase the interest of industrial enterprises in the wider use of tools with ceramic cutting inserts in metalworking. Tab. 2, ill. 6, bibliography: 9 titles.
The problem of increasing the efficiency of manual grinding of high-quality and artistic glass by increasing the wear resistance of the bond and decreasing the relative consumption of diamonds is considered. It has been established that in diamond wheels for grinding high-quality and artistic glass, it is advisable to use binders with tungsten carbide powder and cobalt powder. Adding tungsten carbide powder to the binder in an amount of 10% leads to a decrease in the relative consumption of diamonds by 15 - 20%, and the addition of 10% cobalt powder to the binder leads to a decrease in the relative consumption of diamonds by 45 - 50%. In this case, the roughness of the treated surface does not deteriorate. Currently, new circles are successfully working at 35 enterprises in the Czech Republic and Slovakia. Il. 4, bibliography: 6 titles.
An increase in productivity and a decrease in the cost of grinding products from profiled and art glass is achieved as a result of using special multi-spindle copying machines or CNC machines. An increase in the dimensional resistance of diamond wheels for machining was carried out by increasing the wear resistance of the bond. It has been established that the addition of 10% cobalt powder to the binder is optimal and leads to a decrease in the relative consumption of diamonds by 45 - 50% and to an increase in the dimensional resistance of the wheel by 40 - 45%. New wheels for machine grinding of high-quality and art glass on a bond with the addition of 10% cobalt powder are recommended for industrial use. Il. 2, bibliography: 3 titles.
An increase in the dimensional resistance of diamond wheels for machining is shown by optimizing the hardness of the bond, choosing a diamond powder with optimal strength and concentration. New wheels on a bond with hardness HB105 - 110 with diamond powder AC50 - AC65 and with a concentration of 100 - 125% were recommended for industrial use. Il. 4, bibliography: 4 titles.
The technological schemes of processing a large-sized prism from blocking in gypsum and processing with free abrasives with the transition to individual fastening and the use of a bonded diamond tool in operations of coarse and fine grinding are considered. The results of improving the processing process with the transition to fine grinding operations from patch to plate tool and from felt to cloth PTS during polishing are presented. Tab. 3, ill. 3, bibliography: 5 titles.
The main provisions on the choice of processing modes for diamond drilling of nonmetallic materials are presented. The process of microcutting with a single diamond grain is considered and, on the basis of known regularities, dependences are obtained that connect the components of the cutting force and the ratio of the speed of the main movement to the feed. The possibility of adaptive control of the process of drilling of non-metallic materials using two-circuit systems along the feed channel and along the speed channel of the main movement is shown. Il. 1, bibliography: 4 titles.
The structure of PTS polishing cloth with a 30% content of synthetic fibers is described. The results of its testing for the processing of optical materials in pure form and with a specially developed impregnation are presented. The structure and performance of the twisted polishing pad are considered. Tab. 1, bibliography: 8 titles.
