Integrated system for design and products quality control based on additive technologies for high-tech industries
The article describes the functional structure of an integrated computer system that allows choosing the equipment for 3D printing on the basis of information and mathematical models to study the quality of printed high-tech polymeric and ceramic materials, as well as the necessary mode of its functioning. The integrated system includes the modules for selecting 3D printing technologies (extrusion, sintering) and 3D printers, a module for searching for the parameters of equipment for obtaining products of a given quality, a visualization module for simulation results, and a module for generating a product passport. The integrated system can be used as a training and educational system for training specialists in the field of additive technologies, taking into account the study of the complete life cycle of the synthesis of complex products (from studying the properties of composite materials and designing prototypes of products to assessing the quality of printed products). Testing of the computer system, which confirmed its operability, was carried out on the basis of the Engineering Center of SPbSIT (TU), the corporation Klöckner Pentaplast and Virial Ltd. (St. Petersburg). The use of an integrated system at enterprises of high-tech industries allows us to solve the problem of designing and managing the quality of complex products, saving raw materials and materials, which reduce the cost and time of production of high technology products.
METHODS AND TECHNOLOGIES FOR SYNTHESIS OF MATHEMATICAL MODELS FOR EXTRUSION PROCESSES IN FLEXIBLE PRODUCTIONS OF POLYMERIC MATERIALS
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Comparison between Two Chemicals for Reducing Scale Formation in Reverse Osmosis Systems
In this present research was transacted with the calcium carbonate scale inhibition on the membrane surface of the reverse osmosis desalination system. Influence of changing feed solution flow rate (10-25)l/h, pH of the feed solution (6-10) on the recovery ,penetrate flow rate and total dissolved solid in (RO) system by using solution of calcium carbonate as feed solution was investigated, furthermore the effect of adding two types of scale inhibitor ,zinc chloride and polyamino polyether methylene phosphonate with difference concentration (2-8)mg/l for zinc chloride and (8-15) mg/l for polyamino polyether methylene phosphonate was calculated. The results showed that the permeate rate increases as the feed flow rate augmentation ,while it reducing with time, the total dissolved solids decreases as the feed flow rate increases while it increases with time and recovery rate decreases as the feed flow rate increases and it also decreases with time. It was concluded that the permeate rate decreases as the feed solution pH value increases and it cause high scale forming thus decrease the permeate TDS.By adding the scale inhibitor, it was found that the permeate rate and recovery rates increases as the concentration of inhibitor increases while the total dissolved solids decreases in the permeate with increasing the concentration of both inhibitors .It was discovered that Polyamino polyether methylene phosphonate more sturdy than zinc chloride as scale inhibitor for reverse osmosis desalination system in all concentrations was studied in this article.