No abstract

The use of modern machining centers with wide technological capabilities and the active development of productions with a small-scale form of organization necessitates an increase in the efficiency of fixtures capable of ensuring sufficient accuracy of machining with minimal costs.Classical approaches to the design of fixtures do not always allow machining with one installation with high-performance cutting conditions, so it is necessary to move the new approaches that allow maximum tool availability, which is important for the competitiveness of enterprises.The analysis of research and publications on numerical modeling and experimental research on the processing of parts of a complex shape that have insufficient rigidity showed that the issues of static research of the stress-deformation state of fixtures with incomplete locating have received little attention in the scientific literature.The purpose of the article is to experimentally demonstrate the possibility of machining non-separable connecting rods in machine tools with incomplete basing and fastening only on unprocessed surfaces in one installation with the achievement of all the necessary indicators of dimensional accuracy.The work presents for the first time an improved fixture with an incomplete location for machining connecting rod-type parts, and experimental studies of its stress-strain state in static mode are performed. The determined values of stresses and displacements compared with the previously proposed machine tool showed its technical advantage in bearing capacity for loads acting during machining.In this work, it was experimentally proven for the first time that the design of the improved fixture for machining connecting rods is capable of providing the necessary machining accuracy under static load and at the same time has a margin of accuracy thatexceeds the value of deformations by 1.5...2.5 times. The presented results and the positive experience of manufacturing a sample of a fixture can be used for its further research in a dynamic mode directly during machining, as well as for the design of technological equipment for parts of other classes, using an approach that involves incomplete locating of the workpiece