Abstract: Based on the cutting experiments of the tube section material that is the 2.25Cr-1Mo-0.25V steel, the study on the adhering failure problem of the tool-chip in the process of the extremely heavy cutting is done, so to provide the theoretical basis for avoiding the cutter adhering failure in the actual machining process. The fluctuation characteristics of the variable load in the extremely heavy turning process is analyzed, and then the influence of the fluctuant temperature and mechanical load on the strength of the tool surface is studied based on the simulation analysis and experiments analysis, so to have adhering failure analysis of the tool-chip. The comprehensive theoretical analysis is done, and the critical adhering condition of the tools-chip under the condition of the extremely heavy cutting is established, and the verification analysis on it is done combined with the experimental test data. The preventive measures are provided from the aspects of the technical means and optimization of the process parameters. The research results show that the coupling impact of the fluctuant heat and mechanical load is the main factor that leads to the adhering of the tool-chip generating in the cutting area, and the adhering degree is connected with the size of stress between the tool and work-piece material contact area.

Key words: Adhering failure, Fluctuant load, Mechanical impact, Weariness