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The most complex operation in the technological process of bread production is the division of the finished dough into blanks of the same mass. Vacuum-piston type dough separators perform this operation. Under operating conditions, the service life of the machines is 30-40 percent lower than the manufacturer's stated one. (Research purpose) The research purpose is in studying the permissible values of wear on the working surfaces of parts of vacuum-piston type dough dividing machines without repair. (Materials and methods) The article considers the method of multiple regression, which consists in studying the relationship between the maximum wear of the working surfaces of parts and the consumption of edible oil to determine the permissible sizes of parts of dough-dividing machines without repair. The parts were measured in several cross-sections in width and height. The sections were selected at the points of contact of the parts when they were moved relative to each other during the working stroke. (Results and discussion) The article presents a statistical relationship between the consumption of edible oil and the significantly affecting wear of the working surfaces of the parts of the dividing device of dough dividing machines. The values of permissible wear on the working surfaces of parts were determined by the method of steep ascent. (Conclusions) Using the method of multiple regression, the received linear regression equation adequately describes the relationship of the consumption of edible oil with the wear surfaces of separating device of TD-4 vacuum-piston type dough dividing machines. Authors determined the wear on the surfaces of parts of dividing devices and their influence on the dependent variable, the consumption of edible oil. The obtained values are fundamental for fault detection and the choice of a method for restoring worn surfaces of parts.

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