FEATURES OF GRINDING OF BLANKS FROM CEMENTED STEEL
Abstract
DOI: https://doi.org/10.26565/2079-1747-2026-37-09
The use of grinding as a final operation in the manufacture of parts from hardened steel cemented blanks is preferable compared to other methods of mechanical processing. It is well known that this processing method provides high wear resistance and accuracy of ground surfaces with highly cost-effective process productivity and cost-effectiveness due to the replacement of high-temperature hardening with continuous hardening and reducing the cost of performing other chemical-thermal treatment processes similar in purpose (nitriding, cyanidation, etc.).
However, the grinding process of hardened cemented steels has not been studied in sufficient depth. A number of researchers note that the wear of abrasive wheels when grinding cemented workpieces is significantly greater compared to the processing of high-carbon steel workpieces of the same hardness, and therefore, lower productivity is provided when removing the same allowances. Obviously, this is due to differences in the structure of the surface layer due to the presence of chromium, molybdenum, nickel and other alloying elements, which increases the thermophysical stress of the grinding process. Particularly poorly studied are the aspects of the influence on the processing performance of the heterogeneity of the physical and mechanical properties of the core and the surface layer of the workpieces, the degree of warping and scorching during heat treatment and grinding.
The article is devoted to the analysis of the features of the grinding process of parts made of cemented steels and the relationship between the main quality indicators and operational characteristics. The conducted research emphasizes the relevance of using grinding as a finishing operation to achieve high wear resistance and surface accuracy, despite the insufficient study of the process for cemented steels, which have increased abrasive wear resistance of the surface layer.
The key parameters that affect the durability of parts are considered, in particular, roughness, waviness, macrogeometry and microhardness of the surface layer.
Changes in the structure of the surface layer (austenite transformation into martensite, "self-hardening effect") under the influence of high temperatures and deformations that occur during grinding are studied.
Existing mathematical and empirical models of abrasive grain and the working surface of a grinding wheel (GW) are analyzed, describing the influence of geometric parameters and processing modes on the surface quality.
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References
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