Static stiffness of curcular saw blades

The article outlines the technique of strain estimating of a band saw blade. The quality of processing depends on the strain character of a band saw rim, improved quality of processing being provided by the saws where the rim is not displaced in opposite directions over the saw perimeter under axial loading

Earth drill with storage unit for examination of soils in horizontal alignment of roads

The article considers the design of earth drill with storage unit for examination of soils in horizontal alignment of roads allowing to improve process of ground drilling and sampling for researches. Currently, drilling can be performed both by hand drills and machine-driven ones. One of the drawbacks of such drilling is hole sloughing when extracting drill. In order to avoid this problem, the article describes a new design of earth drill with storage unit

Resistance of a delta wing in a supersonic flow

The resistance of a delta wing at small angle of attack in supersonic conical flow with its leading edges within the Mach cone is calculated by a method that separates out the suction force

Winding of cylindrical products and curved bars of reinforced polyethylene terephtalate

The fundamentals are developed, regularities are analyzed and patterns are estimated of one-step process of winding cylindrical and curved products from recycled PET. Experimental samples of cylindrical and oval products are obtained. The method for estimation of parameters of the winding process by criteria impregnation and consolidation. The method developed can be used to determine the optimal mode of winding cylindrical and curved reinforced tape products based thermoplastics

Technological characteristics of materials based on metal-containing polymeric wastes produced by seam-forming method

The technological characteristics of materials based on metal-containing polymeric wastes to calculate and optimize the seam-forming process parameters were defined. According to the method of the disk compression between parallel plates, the parameters of the flow law, consistency coefficient, and the exponent were determined. The data on the conditional yiel d strength, coefficient of friction, diffusivity and shrinkage of compositions based on polymer waste were obtained. The effect of the amount of metal-containing wastes on the technological characteristics of the compositions was determined. The level of viscous properties gives the possibility of processing the compositions by the seam-forming method from metal-containing up to 70% polymer waste. The para meters of the conversion process in the product com-positions based on metal-plastic waste by seam-forming method were estimeted. Depending on the geometry and mass of the resulting products the parameters that determine the performance of the process and selection of basic technological equipment were calculate

Composite materials based on thermoplastic polymers and glass fabrics

The possibility of making prepreg based on thermoplastic polymers and glass fabrics melt technology is shown. The effective permeability coefficients when impregnated fiberglass various thermoplastic binders is experimentally determined. The effect of the exponent in the law of flow of the polymer melt at the effective permeability is shows. The range of admissible parameters prepreg production process is calculated. Experimental samples through glass fiber prepregs and the thermoplastic polymers are made

Combining of fiberfill and thermoplastic polymers

The article deals with an efficient and economic way of combination of the fiber composition from fiberglass waste and thermoplastic polymers. As the mixer of components the disk-extruder is used. The effectiveness of the proposed solutions was investigated and proved experimentally. The secondary composite materials having higher values of physical mechanical properties and longer fibers in the composition in relation to the analogous materials are gained in the screw extruder

Application potential of mixed polymeric wastes of accumulator batteries for article moulding

The composition and properties of mixed polymeric wastes of accumulator batteries have been determined. The possibility of waste processing into moulded articles by pressing with preplastication has been ascertained. Physical and mechanical properties of materials from mixed polymeric wastes have been defined. Recommendations on the regimes of waste processing suitable in terms of their technological and technico-economic parameters have been worked out

Structural-chemical features and morphology of glauconites in sedimentary iron ore of Bakchar prospect (Western Siberia)

The research embraces the investigation results of glauconites in Bakchar iron ore occurrences to evaluate the potential diversified commercial application of this mineral. The following lab methods were used to analyze the morphology, chemical composition and structure of glauconites: granulometric analysis, optical microscopy, electron microscopy, X-ray fluorescence analysis, atomic arc-emission analysis and infrared spectroscopy. Glauconite was classified according to morphology and grain color and chemical composition and some specific characteristics were also determined (relative content of absorbed water, random distribution of smectite flakes within the grain structures). The research results showed that pistacho-green glauconite grains are less subjected to alteration than greenish-yellow grains due to the content of potassium, iron, absorbed water and organic impurities