Fault detection of connecting journals and main journals of the crankshaft

The article deals with the problems associated with the defectiveness of the connecting rod and main journals of the crankshaft, and also presents a mathematical description of this process, taking into account the control of dimensions, shape and location of surfaces. The studies were carried out at the repair enterprises of the agro-industrial complex. Determining the condition of parts after fault detection is an important step in the repair process. This determines whether parts can be machined to repair size or should be rejected. To more accurately determine the condition of defective parts, a tool was developed for monitoring and analyzing dimensions and shape deviations. This tool allows you to evaluate defects in more detail and determine how critical they are for the further use of the part.

Introduction. In the context of import substitution and resource conservation in machine-building production, the control of internal combustion engine parts is becoming increasingly important. If foreign engines cannot be repaired, then domestic engines can be repaired. When repairing engines, important parts that require fault detection are the cylinder block, crankshaft, camshaft, cylinder head, connecting rods and other expensive and heavily loaded parts. The loss or incorrect diagnosis of the condition of one of these parts can significantly increase the cost of a repaired engine. Therefore, fault detection operations should be thorough, competent and require the use of accurate measuring instruments. Metrological support of the repair process is a paramount task to prevent significant risks arising from the control and fault detection of engines.

Object. The object of research is the operation of defective parts in the repair industry.

Materials and methods. The studies were carried out at the repair enterprises of the agro-industrial complex during the fault detection of parts. The mathematical description of the defect detection process is carried out in the form of inequalities.

Results and conclusions. In the process of flaw detection, it is necessary to control not only the dimensions of the parts, but also their shape and surface arrangement. The wear of individual elements of parts occurs faster than others. This is due to the operating conditions. As a result of fault detection of parts, it is possible to determine whether they can be processed to the repair size or should be rejected. A tool for monitoring and analyzing dimensions and shape deviations was developed, which will allow more accurate determination of the condition of the defective part.

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