This paper is dedicated to study of mechanical characteristics (tensile limit, elasticity modulus and relative elongation) of samples made of polyether ether ketone by additive method FDM (FFF). The paper includes results of mechanical tests on tension of sample party and comparison to results of other authors. Conclusions on reasons of the results obtained are made.

Annotation This article examines the study of strength properties of polymer composite material, based on 3D-printed frame produced by FDM technology. The printing material is ABS plastic (acrylonitrile butadiene styrene). After the printing samples frames were soaked in pure epoxy resin with various hardeners. Subsequent curing went in two modes. After that, tensile tests were performed. The strength of impregnated, non-impregnated (clean frame) samples and samples made of pure resin was compared. Tests have shown that the strength of impregnated samples exceeds the strength of non-impregnated ones, but obtained strength value of impregnated samples were far from the expected theoretical values. It was found that low strength is associated with poor quality of the impregnation.

It is shown that the use of low-quality sprayers for pesticide application can lead to the yield decrease and negative environmental consequences. The use of worn nozzles is noted to reduce the efficiency of plant treatment, since the deviation from the dosage norm of plant protection products reaches 30-60 percent. It is noted that foreign-made sprayers are most often used in Russia, since there are no domestic analogues providing similar output parameters. (Research purpose) To investigate the output parameters of the developed slotted agricultural sprayer and compare them with the performance of advanced imported analogues. (Materials and methods) A prototype model of the developed sprayer was made of bronze using mechanical treatment. It was examined on a special test bench in comparison with a reference polymer sprayer. Using optical microscopy the flow rate of the working fluid and the spray angle were measured, as well as the dimensions of the sprayer nozzle. (Results and discussion) It was found that, on average, in the prototype sprayer made of bronze, the flow rate of the working fluid is 1.7 times greater and the spray angle is 37.16 degrees less than those of a reference polymer sprayer. The examination of the spray nozzles by an optical microscope revealed some differences in shape and size. (Conclusions) The developed design of the sprayer reveals a need for improvement: the nozzle shape should be modified to ellipsoid; the nozzle size should be reduced.

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Quality control of spare parts of agricultural machinery has now acquired significant relevance, which is due to the presence of a large share of low-quality products on the market. The use of low-quality spare parts increases the risk of failure of the equipment in use, which lead to its downtime and financial losses of the agricultural producer, which is highly undesirable in the modern realities of the domestic agricultural industry. Contactless methods and tools for quality control of spare parts will improve the accuracy and productivity of control. (Research purpose) The research purpose is in developing a device that allows to control the geometric, physical and mechanical parameters of spare parts, the use of which should increase the performance and accuracy of control due to a comprehensive non-contact method of measuring spare parts. (Materials and methods) Authors applied a non-contact triangulation method for controlling geometric parameters and a X-ray fluorescence method for controlling physical and mechanical parameters. (Results and discussion) The article presents the devices that are closest in technical parameters and based on them an automated measuring device using methods and means that allows controlling the geometric, physical and mechanical parameters of the object. The article presents the principle of operation and functions of an automated measuring device. The article describes the factors that affect the control process by an automated measuring device. (Conclusions) It was found that the use of contactless methods and quality control tools for spare parts of agricultural machinery could improve the accuracy and productivity of control and eliminate the influence of human factors on the measurement process. Timely quality control of spare parts of agricultural machinery using an automated measuring device will allow to identify low-quality or counterfeit spare parts before installation on the repaired equipment, which will reduce the risk of failures of agricultural machinery.