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Volodimir Didur, Assoc. Prof.,PhD tech. sci. Umany National University of Horticulture, Umany, Ukraine Andrii Chebanov, PhD tech. sci., Volodimir Didur, Prof., DSc., Olga Nazarova, Assoc. Prof.,PhD tech. sci., Oleksiy Vereshaga, engineer Tavria State Agrotechnological University, Melitopol, Ukraine Optimization of Design and Technological Parameters of Auger Press for Squeezing of a Castor Seed Brain (on the Example of One Coil of a Screw Shaft) The quality and quantity of finished products when castor is processed depends largely on the technology adopted. In the castor processing technology, an important role is given to the operation of squeezing oil by pressing the cereal. Structural and technological parameters that affect the amount of oil obtained after pressing are the free volume between the pressing coils of the auger press, the temperature in the space of the zeros, the size of the gap between the zeros of the press plates. The purpose of the article is to increase the efficiency of the process of squeezing oil from castor seeds by optimizing the design and technological parameters of the screw press. In order to optimize the design and technological parameters of the auger press, it is advisable to consider experimental studies of the pressing of the castor bean seed seed on each individual press of a screw shaft. For the purpose of such studies, the expanded channel method was used. The maximum amount of oil is ensured at the optimum structural and technological parameters of the expanded channel, the finding of which requires the use of the method of mathematical planning of the experiment. As an example, the design, subsequent conduct and processing of the experiment was carried out for one pressing coil of a screw shaft. On the example of this pressing coil, further studies will be made for other coils of auger presses. The main criterion for optimization is the relative mass of oil. Optimal parameters of pressing of the castor seed brain for the third coil of the screw shaft were determined: compression ratio =2.09; gap in the nail bars =1,22mm; the temperature of the brain inside the channel t=104oC. castor seeds, kernel, pressing, auger shaft, expanded channel, extruder, relative mass of oil